shithub: riscv

Download patch

ref: 6c5e9f73197f0e6bfc59119541312a1d281133b2
parent: 17f7f6be4e1a316c0f5f26ff70e047aece4de2bc
author: Jacob Moody <[email protected]>
date: Wed Apr 24 15:19:09 EDT 2024 

ja, jc, jl: import from 9p.io

Only changes are moving from i* to j*
and some minor mkfile cleaning.
No code changes, so these do not work as-is yet.

diff: cannot open b/sys/src/cmd/ja//null: file does not exist: 'b/sys/src/cmd/ja//null' diff: cannot open b/sys/src/cmd/jc//null: file does not exist: 'b/sys/src/cmd/jc//null' diff: cannot open b/sys/src/cmd/jl//null: file does not exist: 'b/sys/src/cmd/jl//null' 
--- /dev/null
+++ b/sys/src/cmd/ja/a.h
@@ -1,0 +1,182 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include "../jc/j.out.h"
+
+#ifndef	EXTERN
+#define	EXTERN	extern
+#endif
+
+typedef	struct	Sym	Sym;
+typedef	struct	Gen	Gen;
+typedef	struct	Io	Io;
+typedef	struct	Hist	Hist;
+
+#define	MAXALIGN	7
+#define	FPCHIP		1
+#define	NSYMB		500
+#define	BUFSIZ		(16*1024)
+#define	HISTSZ		20
+#define	NINCLUDE	10
+#define	NHUNK		10000
+#define	EOF		(-1)
+#define	IGN		(-2)
+#define	GETC()		((--fi.c < 0)? filbuf(): *fi.p++ & 0xff)
+#define	NHASH		503
+#define	STRINGSZ	200
+#define	NMACRO		10
+
+struct	Sym
+{
+	Sym*	link;
+	char*	macro;
+	long	value;
+	ushort	type;
+	char	*name;
+	char	sym;
+};
+#define	S	((Sym*)0)
+
+EXTERN	struct
+{
+	char*	p;
+	int	c;
+} fi;
+
+struct	Io
+{
+	Io*	link;
+	char	b[BUFSIZ];
+	char*	p;
+	short	c;
+	short	f;
+};
+#define	I	((Io*)0)
+
+EXTERN	struct
+{
+	Sym*	sym;
+	short	type;
+} h[NSYM];
+
+struct	Gen
+{
+	Sym	*sym;
+	long	offset;
+	short	type;
+	short	reg;
+	short	name;
+	double	dval;
+	char	sval[8];
+	vlong	vval;
+};
+
+struct	Hist
+{
+	Hist*	link;
+	char*	name;
+	long	line;
+	long	offset;
+};
+#define	H	((Hist*)0)
+
+enum
+{
+	CLAST,
+	CMACARG,
+	CMACRO,
+	CPREPROC,
+};
+
+EXTERN	char	debug[256];
+EXTERN	Sym*	hash[NHASH];
+EXTERN	char*	Dlist[30];
+EXTERN	int	nDlist;
+EXTERN	Hist*	ehist;
+EXTERN	int	newflag;
+EXTERN	Hist*	hist;
+EXTERN	char*	hunk;
+EXTERN	char*	include[NINCLUDE];
+EXTERN	Io*	iofree;
+EXTERN	Io*	ionext;
+EXTERN	Io*	iostack;
+EXTERN	long	lineno;
+EXTERN	int	nerrors;
+EXTERN	long	nhunk;
+EXTERN	int	ninclude;
+EXTERN	int	nosched;
+EXTERN	Gen	nullgen;
+EXTERN	char*	outfile;
+EXTERN	int	pass;
+EXTERN	char*	pathname;
+EXTERN	long	pc;
+EXTERN	int	peekc;
+EXTERN	int	sym;
+EXTERN	char	symb[NSYMB];
+EXTERN	int	thechar;
+EXTERN	char*	thestring;
+EXTERN	long	thunk;
+EXTERN	Biobuf	obuf;
+
+void*	alloc(long);
+void*	allocn(void*, long, long);
+void	errorexit(void);
+void	pushio(void);
+void	newio(void);
+void	newfile(char*, int);
+Sym*	slookup(char*);
+Sym*	lookup(void);
+void	syminit(Sym*);
+long	yylex(void);
+int	getc(void);
+int	getnsc(void);
+void	unget(int);
+int	escchar(int);
+void	cinit(void);
+void	pinit(char*);
+void	cclean(void);
+void	outcode(int, Gen*, int, Gen*);
+void	zname(char*, int, int);
+void	zaddr(Gen*, int);
+void	ieeedtod(Ieee*, double);
+int	filbuf(void);
+Sym*	getsym(void);
+void	domacro(void);
+void	macund(void);
+void	macdef(void);
+void	macexpand(Sym*, char*);
+void	macinc(void);
+void	macprag(void);
+void	maclin(void);
+void	macif(int);
+void	macend(void);
+void	dodefine(char*);
+void	prfile(long);
+void	outhist(void);
+void	linehist(char*, int);
+void	gethunk(void);
+void	yyerror(char*, ...);
+int	yyparse(void);
+void	setinclude(char*);
+int	assemble(char*);
+
+/*
+ *	system-dependent stuff from ../cc/compat.c
+ */
+
+enum				/* keep in synch with ../cc/cc.h */
+{
+	Plan9	= 1<<0,
+	Unix	= 1<<1,
+	Windows	= 1<<2
+};
+int	mywait(int*);
+int	mycreat(char*, int);
+int	systemtype(int);
+int	pathchar(void);
+char*	mygetwd(char*, int);
+int	myexec(char*, char*[]);
+int	mydup(int, int);
+int	myfork(void);
+int	mypipe(int*);
+void*	mysbrk(ulong);
--- /dev/null
+++ b/sys/src/cmd/ja/a.y
@@ -1,0 +1,514 @@
+%{
+#include "a.h"
+%}
+%union
+{
+	Sym	*sym;
+	vlong	lval;
+	double	dval;
+	char	sval[8];
+	Gen	gen;
+}
+%left	'|'
+%left	'^'
+%left	'&'
+%left	'<' '>'
+%left	'+' '-'
+%left	'*' '/' '%'
+%token	<lval>	LADD LMUL LBEQ LBR LBRET LCALL LFLT2 LFLT3
+%token	<lval>	LMOVB LMOVBU LMOVW LMOVF LLUI LSYS LSYS0 LCSR LSWAP LAMO
+%token	<lval>	LCONST LSP LSB LFP LPC LREG LFREG LR FR LCTL
+%token	<lval>	LDATA LTEXT LWORD
+%token	<sval>	LSCONST
+%token	<dval>	LFCONST
+%token	<sym>	LNAME LLAB LVAR
+%type	<lval>	con expr pointer offset sreg freg oprrr
+%type	<gen>	rreg dreg ctlreg drreg
+%type	<gen>	addr name oreg rel imm ximm fimm
+%%
+prog:
+|	prog line
+
+line:
+	LLAB ':'
+	{
+		if($1->value != pc)
+			yyerror("redeclaration of %s", $1->name);
+		$1->value = pc;
+	}
+	line
+|	LNAME ':'
+	{
+		$1->type = LLAB;
+		$1->value = pc;
+	}
+	line
+|	LNAME '=' expr ';'
+	{
+		$1->type = LVAR;
+		$1->value = $3;
+	}
+|	LVAR '=' expr ';'
+	{
+		if($1->value != $3)
+			yyerror("redeclaration of %s", $1->name);
+		$1->value = $3;
+	}
+|	';'
+|	inst ';'
+|	error ';'
+
+inst:
+	LADD imm ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	oprrr rreg ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LADD imm ',' sreg ',' rreg
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+|	oprrr rreg ',' sreg ',' rreg
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+
+|	LFLT2 drreg ',' drreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LFLT3 drreg ',' freg ',' drreg
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+
+|	LBEQ rreg ',' sreg ',' rel
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+
+|	LBEQ rreg ',' rel
+	{
+		Gen regzero;
+		regzero = nullgen;
+		regzero.type = D_REG;
+		regzero.reg = 0;
+		outcode($1, &regzero, $2.reg, &$4);
+	}
+
+|	LBR	rel
+	{
+		outcode($1, &nullgen, NREG, &$2);
+	}
+
+|	LBR oreg
+	{
+		outcode($1, &nullgen, NREG, &$2);
+	}
+
+
+|	LBRET
+	{
+		outcode($1, &nullgen, NREG, &nullgen);
+	}
+
+|	LCALL sreg ',' addr
+	{
+		outcode($1, &nullgen, $2, &$4);
+	}
+|	LCALL sreg ',' rel
+	{
+		outcode($1, &nullgen, $2, &$4);
+	}
+
+|	LMOVB addr ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVBU addr ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVB rreg ',' addr
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+
+|	LMOVF addr ',' dreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVF dreg ',' addr
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVF dreg ',' dreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+
+		
+|	LMOVW imm ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVW ximm ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVW rreg ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVW addr ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVW rreg ',' addr
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LMOVW rreg ',' ctlreg
+	{
+		Gen regzero;
+		regzero = nullgen;
+		regzero.type = D_REG;
+		regzero.reg = 0;
+		outcode(ACSRRW, &$4, $2.reg, &regzero);
+	}
+|	LMOVW imm ',' ctlreg
+	{
+		Gen regzero;
+		int r = $2.offset;
+		if(r < 0 || r >= NREG)
+			yyerror("immediate value out of range");
+		regzero = nullgen;
+		regzero.type = D_REG;
+		regzero.reg = 0;
+		outcode(ACSRRWI, &$4, r, &regzero);
+	}
+|	LMOVW ctlreg ',' rreg
+	{
+		outcode(ACSRRS, &$2, REGZERO, &$4);
+	}
+
+|	LLUI name ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LLUI imm ',' rreg
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+
+
+|	LSYS imm
+	{
+		outcode($1, &nullgen, NREG, &$2);
+	}
+
+|	LSYS0
+	{
+		Gen syscon;
+		syscon = nullgen;
+		syscon.type = D_CONST;
+		syscon.offset = $1;
+		outcode(ASYS, &nullgen, NREG, &syscon);
+	}
+
+|	LCSR ctlreg ',' sreg ',' rreg
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+
+|	LCSR ctlreg ',' '$' con ',' rreg
+	{
+		if($5 < 0 || $5 >= NREG)
+			yyerror("immediate value out of range");
+		outcode($1 + (ACSRRWI-ACSRRW), &$2, $5, &$7);
+	}
+
+|	LSWAP rreg ',' sreg ',' rreg
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+
+|	LAMO con ',' rreg ',' sreg ',' rreg
+	{
+		outcode($1, &$4, ($2<<16)|$6, &$8);
+	}
+
+|	LTEXT name ',' imm
+	{
+		outcode($1, &$2, NREG, &$4);
+	}
+|	LTEXT name ',' con ',' imm
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+
+|	LDATA name '/' con ',' imm
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+|	LDATA name '/' con ',' ximm
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+|	LDATA name '/' con ',' fimm
+	{
+		outcode($1, &$2, $4, &$6);
+	}
+
+|	LWORD imm
+	{
+		outcode($1, &nullgen, NREG, &$2);
+	}
+
+rel:
+	con '(' LPC ')'
+	{
+		$$ = nullgen;
+		$$.type = D_BRANCH;
+		$$.offset = $1 + pc;
+	}
+|	LNAME offset
+	{
+		$$ = nullgen;
+		if(pass == 2)
+			yyerror("undefined label: %s", $1->name);
+		$$.type = D_BRANCH;
+		$$.sym = $1;
+		$$.offset = $2;
+	}
+|	LLAB offset
+	{
+		$$ = nullgen;
+		$$.type = D_BRANCH;
+		$$.sym = $1;
+		$$.offset = $1->value + $2;
+	}
+
+oprrr:
+	LADD
+|	LMUL
+
+addr:
+	oreg
+|	name
+
+oreg:
+	'(' sreg ')'
+	{
+		$$ = nullgen;
+		$$.type = D_OREG;
+		$$.reg = $2;
+		$$.offset = 0;
+	}
+|	con '(' sreg ')'
+	{
+		$$ = nullgen;
+		$$.type = D_OREG;
+		$$.reg = $3;
+		$$.offset = $1;
+	}
+
+name:
+	con '(' pointer ')'
+	{
+		$$ = nullgen;
+		$$.type = D_OREG;
+		$$.name = $3;
+		$$.sym = S;
+		$$.offset = $1;
+	}
+|	LNAME offset '(' pointer ')'
+	{
+		$$ = nullgen;
+		$$.type = D_OREG;
+		$$.name = $4;
+		$$.sym = $1;
+		$$.offset = $2;
+	}
+|	LNAME '<' '>' offset '(' LSB ')'
+	{
+		$$ = nullgen;
+		$$.type = D_OREG;
+		$$.name = D_STATIC;
+		$$.sym = $1;
+		$$.offset = $4;
+	}
+
+offset:
+	{
+		$$ = 0;
+	}
+|	'+' con
+	{
+		$$ = $2;
+	}
+|	'-' con
+	{
+		$$ = -$2;
+	}
+
+pointer:
+	LSB
+|	LSP
+|	LFP
+
+rreg:
+	sreg
+	{
+		$$ = nullgen;
+		$$.type = D_REG;
+		$$.reg = $1;
+	}
+
+dreg:
+	freg
+	{
+		$$ = nullgen;
+		$$.type = D_FREG;
+		$$.reg = $1;
+	}
+
+drreg:
+	dreg
+|	rreg
+	
+sreg:
+	LREG
+|	LR '(' expr ')'
+	{
+		if($3 < 0 || $3 >= NREG)
+			yyerror("register value out of range");
+		$$ = $3;
+	}
+
+freg:
+	LFREG
+|	FR '(' expr ')'
+	{
+		if($3 < 0 || $3 >= NREG)
+			yyerror("register value out of range");
+		$$ = $3;
+	}
+
+ctlreg:
+	LCTL '(' expr ')'
+	{
+		if($3 < 0 || $3 >= 0xFFF)
+			yyerror("CSR value out of range");
+		$$ = nullgen;
+		$$.type = D_CTLREG;
+		$$.offset = $3;
+	}
+
+ximm:
+	'$' addr
+	{
+		$$ = $2;
+		$$.type = D_CONST;
+	}
+|	'$' LSCONST
+	{
+		$$ = nullgen;
+		$$.type = D_SCONST;
+		memcpy($$.sval, $2, sizeof($$.sval));
+	}
+
+fimm:
+	'$' LFCONST
+	{
+		$$ = nullgen;
+		$$.type = D_FCONST;
+		$$.dval = $2;
+	}
+|	'$' '-' LFCONST
+	{
+		$$ = nullgen;
+		$$.type = D_FCONST;
+		$$.dval = -$3;
+	}
+
+imm:
+	'$' con
+	{
+		$$ = nullgen;
+		$$.type = D_CONST;
+		$$.offset = $2;
+		if(thechar == 'j' && (vlong)$$.offset != $2){
+			$$.type = D_VCONST;
+			$$.vval = $2;
+		}
+	}
+
+con:
+	LCONST
+|	LVAR
+	{
+		$$ = $1->value;
+	}
+|	'-' con
+	{
+		$$ = -$2;
+	}
+|	'+' con
+	{
+		$$ = $2;
+	}
+|	'~' con
+	{
+		$$ = ~$2;
+	}
+|	'(' expr ')'
+	{
+		$$ = $2;
+	}
+
+expr:
+	con
+|	expr '+' expr
+	{
+		$$ = $1 + $3;
+	}
+|	expr '-' expr
+	{
+		$$ = $1 - $3;
+	}
+|	expr '*' expr
+	{
+		$$ = $1 * $3;
+	}
+|	expr '/' expr
+	{
+		$$ = $1 / $3;
+	}
+|	expr '%' expr
+	{
+		$$ = $1 % $3;
+	}
+|	expr '<' '<' expr
+	{
+		$$ = $1 << $4;
+	}
+|	expr '>' '>' expr
+	{
+		$$ = $1 >> $4;
+	}
+|	expr '&' expr
+	{
+		$$ = $1 & $3;
+	}
+|	expr '^' expr
+	{
+		$$ = $1 ^ $3;
+	}
+|	expr '|' expr
+	{
+		$$ = $1 | $3;
+	}
--- /dev/null
+++ b/sys/src/cmd/ja/l.s
@@ -1,0 +1,15 @@
+TEXT	_main(SB), $0
+
+	ADD		R1,R4
+	ADD		R1,R3,R4
+	ADD		$10,R1,R4
+
+loop:
+	BNE		R1,R4,loop
+
+	MOVW		R3, (R2)
+	MOVW		R3, 10(R2)
+	MOVW		R3, _main(SB)
+	MOVW		R3, (R2)
+
+	RET
--- /dev/null
+++ b/sys/src/cmd/ja/lex.c
@@ -1,0 +1,643 @@
+#include <ctype.h>
+#define	EXTERN
+#include "a.h"
+#include "y.tab.h"
+
+void
+main(int argc, char *argv[])
+{
+	char *p;
+	int nout, nproc, status, i, c;
+
+	thechar = 'i';
+	p = strrchr(argv[0], '/');
+	if(p == nil)
+		p = argv[0];
+	else
+		p++;
+	if(*p == 'j')
+		thechar = 'j';
+	memset(debug, 0, sizeof(debug));
+	cinit();
+	outfile = 0;
+	include[ninclude++] = ".";
+	ARGBEGIN {
+	default:
+		c = ARGC();
+		if(c >= 0 || c < sizeof(debug))
+			debug[c] = 1;
+		break;
+
+	case 'o':
+		outfile = ARGF();
+		break;
+
+	case 'D':
+		p = ARGF();
+		if(p)
+			Dlist[nDlist++] = p;
+		break;
+
+	case 'I':
+		p = ARGF();
+		setinclude(p);
+		break;
+
+	} ARGEND
+	if(*argv == 0) {
+		print("usage: %ca [-options] file.s\n", thechar);
+		errorexit();
+	}
+	if(debug['j'])
+		thechar = 'j';
+	thestring = (thechar == 'j'? "riscv64" : "riscv");
+	if(argc > 1 && systemtype(Windows)){
+		print("can't assemble multiple files on windows\n");
+		errorexit();
+	}
+	if(argc > 1 && !systemtype(Windows)) {
+		nproc = 1;
+		if(p = getenv("NPROC"))
+			nproc = atol(p);	/* */
+		c = 0;
+		nout = 0;
+		for(;;) {
+			while(nout < nproc && argc > 0) {
+				i = myfork();
+				if(i < 0) {
+					i = mywait(&status);
+					if(i < 0)
+						errorexit();
+					if(status)
+						c++;
+					nout--;
+					continue;
+				}
+				if(i == 0) {
+					print("%s:\n", *argv);
+					if(assemble(*argv))
+						errorexit();
+					exits(0);
+				}
+				nout++;
+				argc--;
+				argv++;
+			}
+			i = mywait(&status);
+			if(i < 0) {
+				if(c)
+					errorexit();
+				exits(0);
+			}
+			if(status)
+				c++;
+			nout--;
+		}
+	}
+	if(assemble(argv[0]))
+		errorexit();
+	exits(0);
+}
+
+int
+assemble(char *file)
+{
+	char ofile[100], incfile[20], *p;
+	int i, of;
+
+	strcpy(ofile, file);
+	p = utfrrune(ofile, pathchar());
+	if(p) {
+		include[0] = ofile;
+		*p++ = 0;
+	} else
+		p = ofile;
+	if(outfile == 0) {
+		outfile = p;
+		if(outfile){
+			p = utfrrune(outfile, '.');
+			if(p)
+				if(p[1] == 's' && p[2] == 0)
+					p[0] = 0;
+			p = utfrune(outfile, 0);
+			p[0] = '.';
+			p[1] = thechar;
+			p[2] = 0;
+		} else
+			outfile = "/dev/null";
+	}
+	p = getenv("INCLUDE");
+	if(p) {
+		setinclude(p);
+	} else {
+		if(systemtype(Plan9)) {
+			sprint(incfile,"/%s/include", thestring);
+			setinclude(strdup(incfile));
+		}
+	}
+
+	of = mycreat(outfile, 0664);
+	if(of < 0) {
+		yyerror("%ca: cannot create %s", thechar, outfile);
+		errorexit();
+	}
+	Binit(&obuf, of, OWRITE);
+
+	pass = 1;
+	pinit(file);
+	if(thechar == 'j')
+		dodefine("XLEN=8");
+	else
+		dodefine("XLEN=4");
+	for(i=0; i<nDlist; i++)
+		dodefine(Dlist[i]);
+	yyparse();
+	if(nerrors) {
+		cclean();
+		return nerrors;
+	}
+
+	pass = 2;
+	outhist();
+	pinit(file);
+	if(thechar == 'j')
+		dodefine("XLEN=8");
+	else
+		dodefine("XLEN=4");
+	for(i=0; i<nDlist; i++)
+		dodefine(Dlist[i]);
+	yyparse();
+	cclean();
+	return nerrors;
+}
+
+struct
+{
+	char	*name;
+	ushort	type;
+	ushort	value;
+} itab[] =
+{
+	"SP",		LSP,	D_AUTO,
+	"SB",		LSB,	D_EXTERN,
+	"FP",		LFP,	D_PARAM,
+	"PC",		LPC,	D_BRANCH,
+
+	"R",		LR,	0,
+	"R0",		LREG,	0,
+	"R1",		LREG,	1,
+	"R2",		LREG,	2,
+	"R3",		LREG,	3,
+	"R4",		LREG,	4,
+	"R5",		LREG,	5,
+	"R6",		LREG,	6,
+	"R7",		LREG,	7,
+	"R8",		LREG,	8,
+	"R9",		LREG,	9,
+	"R10",		LREG,	10,
+	"R11",		LREG,	11,
+	"R12",		LREG,	12,
+	"R13",		LREG,	13,
+	"R14",		LREG,	14,
+	"R15",		LREG,	15,
+	"R16",		LREG,	16,
+	"R17",		LREG,	17,
+	"R18",		LREG,	18,
+	"R19",		LREG,	19,
+	"R20",		LREG,	20,
+	"R21",		LREG,	21,
+	"R22",		LREG,	22,
+	"R23",		LREG,	23,
+	"R24",		LREG,	24,
+	"R25",		LREG,	25,
+	"R26",		LREG,	26,
+	"R27",		LREG,	27,
+	"R28",		LREG,	28,
+	"R29",		LREG,	29,
+	"R30",		LREG,	30,
+	"R31",		LREG,	31,
+
+	"F",		FR,	0,
+	"F0",		LFREG,	0,
+	"F1",		LFREG,	1,
+	"F2",		LFREG,	2,
+	"F3",		LFREG,	3,
+	"F4",		LFREG,	4,
+	"F5",		LFREG,	5,
+	"F6",		LFREG,	6,
+	"F7",		LFREG,	7,
+	"F8",		LFREG,	8,
+	"F9",		LFREG,	9,
+	"F10",		LFREG,	10,
+	"F11",		LFREG,	11,
+	"F12",		LFREG,	12,
+	"F13",		LFREG,	13,
+	"F14",		LFREG,	14,
+	"F15",		LFREG,	15,
+	"F16",		LFREG,	16,
+	"F17",		LFREG,	17,
+	"F18",		LFREG,	18,
+	"F19",		LFREG,	19,
+	"F20",		LFREG,	20,
+	"F21",		LFREG,	21,
+	"F22",		LFREG,	22,
+	"F23",		LFREG,	23,
+	"F24",		LFREG,	24,
+	"F25",		LFREG,	25,
+	"F26",		LFREG,	26,
+	"F27",		LFREG,	27,
+	"F28",		LFREG,	28,
+	"F29",		LFREG,	29,
+	"F30",		LFREG,	30,
+	"F31",		LFREG,	31,
+
+	"CSR",		LCTL,	0,
+
+	"ADD",		LADD,	AADD,
+	"SLL",		LADD,	ASLL,
+	"SLT",		LADD,	ASLT,
+	"SLTU",		LADD,	ASLTU,
+	"XOR",		LADD,	AXOR,
+	"SRL",		LADD,	ASRL,
+	"OR",		LADD,	AOR,
+	"AND",		LADD,	AAND,
+	"SRA",		LADD,	ASRA,
+	"ADDW",		LADD,	AADDW,
+	"SLLW",		LADD,	ASLLW,
+	"SRLW",		LADD,	ASRLW,
+	"SRAW",		LADD,	ASRAW,
+	"SUB",		LADD,	ASUB,
+	"SUBW",		LADD,	ASUBW,
+
+	"MUL",		LMUL,	AMUL,
+	"MULH",		LMUL,	AMULH,
+	"MULHSU",	LMUL,	AMULHSU,
+	"MULHU",	LMUL,	AMULHU,
+	"DIV",		LMUL,	ADIV,
+	"DIVU",		LMUL,	ADIVU,
+	"REM",		LMUL,	AREM,
+	"REMU",		LMUL,	AREMU,
+	"MULW",		LMUL,	AMULW,
+	"DIVW",		LMUL,	ADIVW,
+	"DIVUW",	LMUL,	ADIVUW,
+	"REMW",		LMUL,	AREMW,
+	"REMUW",	LMUL,	AREMUW,
+
+	"BEQ",		LBEQ,	ABEQ,
+	"BNE",		LBEQ,	ABNE,
+	"BLT",		LBEQ,	ABLT,
+	"BGE",		LBEQ,	ABGE,
+	"BLTU",		LBEQ,	ABLTU,
+	"BGEU",		LBEQ,	ABGEU,
+	"BGT",		LBEQ,	ABGT,
+	"BGTU",		LBEQ,	ABGTU,
+	"BLE",		LBEQ,	ABLE,
+	"BLEU",		LBEQ,	ABLEU,
+
+	"JMP",		LBR,	AJMP,
+
+	"RET",		LBRET,	ARET,
+	"FENCE_I",	LBRET,	AFENCE_I,
+	"NOP",		LBRET,	ANOP,
+	"END",		LBRET,	AEND,
+
+	"JAL",		LCALL,	AJAL,
+	"JALR",		LCALL,	AJAL,
+
+	"MOVB",		LMOVB,	AMOVB,
+	"MOVH",		LMOVB,	AMOVH,
+
+	"MOVF",		LMOVF,	AMOVF,
+	"MOVD",		LMOVF,	AMOVD,
+
+	"MOVBU",	LMOVBU,	AMOVBU,
+	"MOVHU",	LMOVBU,	AMOVHU,
+
+	"MOVW",		LMOVW,	AMOVW,
+
+	"MOVFD",	LFLT2,	AMOVFD,
+	"MOVDF",	LFLT2,	AMOVDF,
+	"MOVWF",	LFLT2,	AMOVWF,
+	"MOVUF",	LFLT2,	AMOVUF,
+	"MOVFW",	LFLT2,	AMOVFW,
+	"MOVWD",	LFLT2,	AMOVWD,
+	"MOVUD",	LFLT2,	AMOVUD,
+	"MOVDW",	LFLT2,	AMOVDW,
+	"ADDF",		LFLT3,	AADDF,
+	"ADDD",		LFLT3,	AADDD,
+	"SUBF",		LFLT3,	ASUBF,
+	"SUBD",		LFLT3,	ASUBD,
+	"MULF",		LFLT3,	AMULF,
+	"MULD",		LFLT3,	AMULD,
+	"DIVF",		LFLT3,	ADIVF,
+	"DIVD",		LFLT3,	ADIVD,
+	"CMPLTF",	LFLT3,	ACMPLTF,
+	"CMPLTD",	LFLT3,	ACMPLTD,
+	"CMPEQF",	LFLT3,	ACMPEQF,
+	"CMPEQD",	LFLT3,	ACMPEQD,
+	"CMPLEF",	LFLT3,	ACMPLEF,
+	"CMPLED",	LFLT3,	ACMPLED,
+
+	"LUI",		LLUI,	ALUI,
+
+	"SYS",		LSYS,	ASYS,
+	"ECALL",	LSYS0,	0,
+	"EBREAK",	LSYS0,	1,
+	"CSRRW",	LCSR,	ACSRRW,
+	"CSRRS",	LCSR,	ACSRRS,
+	"CSRRC",	LCSR,	ACSRRC,
+
+	"SWAP_W",	LSWAP,	ASWAP_W,
+	"SWAP_D",	LSWAP,	ASWAP_D,
+	"LR_W",		LSWAP,	ALR_W,
+	"LR_D",		LSWAP,	ALR_D,
+	"SC_W",		LSWAP,	ASC_W,
+	"SC_D",		LSWAP,	ASC_D,
+
+	"AMO_W",	LAMO,	AAMO_W,
+	"AMO_D",	LAMO,	AAMO_D,
+
+	"DATA",		LDATA, 		ADATA,
+	"GLOBL",	LTEXT, 		AGLOBL,
+	"TEXT",		LTEXT, 		ATEXT,
+	"WORD",		LWORD,		AWORD,
+	"DWORD",	LWORD,		ADWORD,
+
+	"MOV",		LMOVW,		AMOV,
+	"MOVWU",	LMOVBU,		AMOVWU,
+
+	0
+};
+
+void
+cinit(void)
+{
+	Sym *s;
+	int i;
+
+	nullgen.sym = S;
+	nullgen.offset = 0;
+	nullgen.type = D_NONE;
+	nullgen.name = D_NONE;
+	nullgen.reg = NREG;
+	if(FPCHIP)
+		nullgen.dval = 0;
+	for(i=0; i<sizeof(nullgen.sval); i++)
+		nullgen.sval[i] = 0;
+
+	nerrors = 0;
+	iostack = I;
+	iofree = I;
+	peekc = IGN;
+	nhunk = 0;
+	for(i=0; i<NHASH; i++)
+		hash[i] = S;
+	for(i=0; itab[i].name; i++) {
+		s = slookup(itab[i].name);
+		s->type = itab[i].type;
+		s->value = itab[i].value;
+	}
+
+	pathname = allocn(pathname, 0, 100);
+	if(mygetwd(pathname, 99) == 0) {
+		pathname = allocn(pathname, 100, 900);
+		if(mygetwd(pathname, 999) == 0)
+			strcpy(pathname, "/???");
+	}
+}
+
+void
+syminit(Sym *s)
+{
+
+	s->type = LNAME;
+	s->value = 0;
+}
+
+void
+cclean(void)
+{
+
+	outcode(AEND, &nullgen, NREG, &nullgen);
+	Bflush(&obuf);
+}
+
+void
+zname(char *n, int t, int s)
+{
+
+	Bputc(&obuf, ANAME);
+	Bputc(&obuf, t);	/* type */
+	Bputc(&obuf, s);	/* sym */
+	while(*n) {
+		Bputc(&obuf, *n);
+		n++;
+	}
+	Bputc(&obuf, 0);
+}
+
+void
+zaddr(Gen *a, int s)
+{
+	vlong v;
+	long l;
+	int i;
+	char *n;
+	Ieee e;
+
+	Bputc(&obuf, a->type);
+	Bputc(&obuf, a->reg);
+	Bputc(&obuf, s);
+	Bputc(&obuf, a->name);
+	switch(a->type) {
+	default:
+		print("unknown type %d\n", a->type);
+		exits("arg");
+
+	case D_NONE:
+	case D_REG:
+	case D_FREG:
+		break;
+
+	case D_CTLREG:
+	case D_OREG:
+	case D_CONST:
+	case D_BRANCH:
+		l = a->offset;
+		Bputc(&obuf, l);
+		Bputc(&obuf, l>>8);
+		Bputc(&obuf, l>>16);
+		Bputc(&obuf, l>>24);
+		break;
+
+	case D_VCONST:
+		v = a->vval;
+		Bputc(&obuf, v);
+		Bputc(&obuf, v>>8);
+		Bputc(&obuf, v>>16);
+		Bputc(&obuf, v>>24);
+		Bputc(&obuf, v>>32);
+		Bputc(&obuf, v>>40);
+		Bputc(&obuf, v>>48);
+		Bputc(&obuf, v>>56);
+		break;
+
+	case D_SCONST:
+		n = a->sval;
+		for(i=0; i<NSNAME; i++) {
+			Bputc(&obuf, *n);
+			n++;
+		}
+		break;
+
+	case D_FCONST:
+		ieeedtod(&e, a->dval);
+		Bputc(&obuf, e.l);
+		Bputc(&obuf, e.l>>8);
+		Bputc(&obuf, e.l>>16);
+		Bputc(&obuf, e.l>>24);
+		Bputc(&obuf, e.h);
+		Bputc(&obuf, e.h>>8);
+		Bputc(&obuf, e.h>>16);
+		Bputc(&obuf, e.h>>24);
+		break;
+	}
+}
+
+void
+outcode(int a, Gen *g1, int reg, Gen *g2)
+{
+	int sf, st, t;
+	Sym *s;
+
+	if(pass == 1)
+		goto out;
+jackpot:
+	sf = 0;
+	s = g1->sym;
+	while(s != S) {
+		sf = s->sym;
+		if(sf < 0 || sf >= NSYM)
+			sf = 0;
+		t = g1->name;
+		if(h[sf].type == t)
+		if(h[sf].sym == s)
+			break;
+		zname(s->name, t, sym);
+		s->sym = sym;
+		h[sym].sym = s;
+		h[sym].type = t;
+		sf = sym;
+		sym++;
+		if(sym >= NSYM)
+			sym = 1;
+		break;
+	}
+	st = 0;
+	s = g2->sym;
+	while(s != S) {
+		st = s->sym;
+		if(st < 0 || st >= NSYM)
+			st = 0;
+		t = g2->name;
+		if(h[st].type == t)
+		if(h[st].sym == s)
+			break;
+		zname(s->name, t, sym);
+		s->sym = sym;
+		h[sym].sym = s;
+		h[sym].type = t;
+		st = sym;
+		sym++;
+		if(sym >= NSYM)
+			sym = 1;
+		if(st == sf)
+			goto jackpot;
+		break;
+	}
+	Bputc(&obuf, a);
+	Bputc(&obuf, reg);
+	Bputc(&obuf, lineno);
+	Bputc(&obuf, lineno>>8);
+	Bputc(&obuf, lineno>>16);
+	Bputc(&obuf, lineno>>24);
+	zaddr(g1, sf);
+	zaddr(g2, st);
+
+out:
+	if(a != AGLOBL && a != ADATA)
+		pc++;
+}
+
+void
+outhist(void)
+{
+	Gen g;
+	Hist *h;
+	char *p, *q, *op, c;
+	int n;
+
+	g = nullgen;
+	c = pathchar();
+	for(h = hist; h != H; h = h->link) {
+		p = h->name;
+		op = 0;
+		/* on windows skip drive specifier in pathname */
+		if(systemtype(Windows) && p && p[1] == ':'){
+			p += 2;
+			c = *p;
+		}
+		if(p && p[0] != c && h->offset == 0 && pathname){
+			/* on windows skip drive specifier in pathname */
+			if(systemtype(Windows) && pathname[1] == ':') {
+				op = p;
+				p = pathname+2;
+				c = *p;
+			} else if(pathname[0] == c){
+				op = p;
+				p = pathname;
+			}
+		}
+		while(p) {
+			q = strchr(p, c);
+			if(q) {
+				n = q-p;
+				if(n == 0){
+					n = 1;	/* leading "/" */
+					*p = '/';	/* don't emit "\" on windows */
+				}
+				q++;
+			} else {
+				n = strlen(p);
+				q = 0;
+			}
+			if(n) {
+				Bputc(&obuf, ANAME);
+				Bputc(&obuf, D_FILE);	/* type */
+				Bputc(&obuf, 1);	/* sym */
+				Bputc(&obuf, '<');
+				Bwrite(&obuf, p, n);
+				Bputc(&obuf, 0);
+			}
+			p = q;
+			if(p == 0 && op) {
+				p = op;
+				op = 0;
+			}
+		}
+		g.offset = h->offset;
+
+		Bputc(&obuf, AHISTORY);
+		Bputc(&obuf, 0);
+		Bputc(&obuf, h->line);
+		Bputc(&obuf, h->line>>8);
+		Bputc(&obuf, h->line>>16);
+		Bputc(&obuf, h->line>>24);
+		zaddr(&nullgen, 0);
+		zaddr(&g, 0);
+	}
+}
+
+#include "../cc/lexbody"
+#include "../cc/macbody"
+#include "../cc/compat"
--- /dev/null
+++ b/sys/src/cmd/ja/mkfile
@@ -1,0 +1,21 @@
+</$objtype/mkfile
+
+TARG=ja
+
+OFILES=\
+	y.tab.$O\
+	lex.$O\
+
+HFILES=\
+	../jc/j.out.h\
+	y.tab.h\
+	a.h\
+
+YFILES=a.y\
+
+BIN=/$objtype/bin
+
+< /sys/src/cmd/mkone
+YFLAGS=-D1 -d
+
+lex.$O:	../cc/macbody ../cc/lexbody ../cc/compat
--- /dev/null
+++ b/sys/src/cmd/jc/cgen.c
@@ -1,0 +1,1217 @@
+#include "gc.h"
+
+void
+cgen(Node *n, Node *nn)
+{
+	Node *l, *r;
+	Prog *p1;
+	Node nod, nod1, nod2, nod3, nod4;
+	int o;
+	long v, curs;
+
+	if(debug['g']) {
+		prtree(nn, "cgen lhs");
+		prtree(n, "cgen");
+	}
+	if(n == Z || n->type == T)
+		return;
+	if(typecmplx[n->type->etype]) {
+		sugen(n, nn, n->type->width);
+		return;
+	}
+	l = n->left;
+	r = n->right;
+	o = n->op;
+	if(n->addable >= INDEXED) {
+		if(nn == Z) {
+			switch(o) {
+			default:
+				nullwarn(Z, Z);
+				break;
+			case OINDEX:
+				nullwarn(l, r);
+				break;
+			}
+			return;
+		}
+		gmove(n, nn);
+		return;
+	}
+	curs = cursafe;
+
+	if(n->complex >= FNX)
+	if(l->complex >= FNX)
+	if(r != Z && r->complex >= FNX)
+	switch(o) {
+	default:
+		regret(&nod, r);
+		cgen(r, &nod);
+
+		regsalloc(&nod1, r);
+		gopcode(OAS, &nod, Z, &nod1);
+
+		regfree(&nod);
+		nod = *n;
+		nod.right = &nod1;
+		cgen(&nod, nn);
+		return;
+
+	case OFUNC:
+	case OCOMMA:
+	case OANDAND:
+	case OOROR:
+	case OCOND:
+	case ODOT:
+		break;
+	}
+
+	switch(o) {
+	default:
+		diag(n, "unknown op in cgen: %O", o);
+		break;
+
+	case OAS:
+		if(l->op == OBIT)
+			goto bitas;
+		if(l->addable >= INDEXED && l->complex < FNX) {
+			if(nn != Z || r->addable < INDEXED) {
+				if(r->complex >= FNX && nn == Z)
+					regret(&nod, r);
+				else
+					regalloc(&nod, r, nn);
+				cgen(r, &nod);
+				gmove(&nod, l);
+				if(nn != Z)
+					gmove(&nod, nn);
+				regfree(&nod);
+			} else
+				gmove(r, l);
+			break;
+		}
+		if(l->complex >= r->complex) {
+			reglcgen(&nod1, l, Z);
+			if(r->addable >= INDEXED) {
+				gmove(r, &nod1);
+				if(nn != Z)
+					gmove(r, nn);
+				regfree(&nod1);
+				break;
+			}
+			regalloc(&nod, r, nn);
+			cgen(r, &nod);
+		} else {
+			regalloc(&nod, r, nn);
+			cgen(r, &nod);
+			reglcgen(&nod1, l, Z);
+		}
+		gmove(&nod, &nod1);
+		regfree(&nod);
+		regfree(&nod1);
+		break;
+
+	bitas:
+		n = l->left;
+		regalloc(&nod, r, nn);
+		if(l->complex >= r->complex) {
+			reglcgen(&nod1, n, Z);
+			cgen(r, &nod);
+		} else {
+			cgen(r, &nod);
+			reglcgen(&nod1, n, Z);
+		}
+		regalloc(&nod2, n, Z);
+		gopcode(OAS, &nod1, Z, &nod2);
+		bitstore(l, &nod, &nod1, &nod2, nn);
+		break;
+
+	case OBIT:
+		if(nn == Z) {
+			nullwarn(l, Z);
+			break;
+		}
+		bitload(n, &nod, Z, Z, nn);
+		gopcode(OAS, &nod, Z, nn);
+		regfree(&nod);
+		break;
+
+	case OADD:
+	case OSUB:
+	case OAND:
+	case OOR:
+	case OXOR:
+	case OLSHR:
+	case OASHL:
+	case OASHR:
+		/*
+		 * immediate operands
+		 */
+		if(nn != Z)
+		if(sconst(r))
+		if(!typefd[n->type->etype])
+		if(r->vconst >= -2048 && r->vconst < 2048) {
+			cgen(l, nn);
+			if(r->vconst == 0)
+			if(o != OAND)
+				break;
+			if(nn != Z)
+				gopcode(o, r, Z, nn);
+			break;
+		}
+
+	case OLMUL:
+	case OLDIV:
+	case OLMOD:
+	case OMUL:
+	case ODIV:
+	case OMOD:
+		if(nn == Z) {
+			nullwarn(l, r);
+			break;
+		}
+		if(o == OMUL || o == OLMUL) {
+			if(mulcon(n, nn))
+				break;
+		}
+		if(l->complex >= r->complex) {
+			regalloc(&nod, l, nn);
+			cgen(l, &nod);
+			regalloc(&nod1, r, Z);
+			cgen(r, &nod1);
+			gopcode(o, &nod1, Z, &nod);
+		} else {
+			if(typev[n->type->etype] &&
+			   (o == OLSHR || o == OASHL || o == OASHR)){
+				/* vlong shifts: result has type of l, not type of r */
+				regalloc(&nod1, r, Z);
+				cgen(r, &nod1);
+				regalloc(&nod, l, nn);
+				cgen(l, &nod);
+				gopcode(o, &nod1, Z, &nod);
+			}else{
+				regalloc(&nod, r, nn);
+				cgen(r, &nod);
+				regalloc(&nod1, l, Z);
+				cgen(l, &nod1);
+				gopcode(o, &nod, &nod1, &nod);
+			}
+		}
+		gopcode(OAS, &nod, Z, nn);
+		regfree(&nod);
+		regfree(&nod1);
+		break;
+
+	case OASLSHR:
+	case OASASHL:
+	case OASASHR:
+	case OASAND:
+	case OASADD:
+	case OASSUB:
+	case OASXOR:
+	case OASOR:
+		if(l->op == OBIT)
+			goto asbitop;
+		if(sconst(r))
+		if(!typefd[n->type->etype]) {
+			if(l->addable < INDEXED)
+				reglcgen(&nod2, l, Z);
+			else
+				nod2 = *l;
+			regalloc(&nod, r, nn);
+			gopcode(OAS, &nod2, Z, &nod);
+			gopcode(o, r, Z, &nod);
+			gopcode(OAS, &nod, Z, &nod2);
+	
+			regfree(&nod);
+			if(l->addable < INDEXED)
+				regfree(&nod2);
+			break;
+		}
+
+	case OASLMUL:
+	case OASLDIV:
+	case OASLMOD:
+	case OASMUL:
+	case OASDIV:
+	case OASMOD:
+		if(l->op == OBIT)
+			goto asbitop;
+		if(l->complex >= r->complex) {
+			if(l->addable < INDEXED)
+				reglcgen(&nod2, l, Z);
+			else
+				nod2 = *l;
+			regalloc(&nod1, r, Z);
+			cgen(r, &nod1);
+		} else {
+			regalloc(&nod1, r, Z);
+			cgen(r, &nod1);
+			if(l->addable < INDEXED)
+				reglcgen(&nod2, l, Z);
+			else
+				nod2 = *l;
+		}
+
+		regalloc(&nod, n, nn);
+		gmove(&nod2, &nod);
+		gopcode(o, &nod1, Z, &nod);
+		gmove(&nod, &nod2);
+		if(nn != Z)
+			gopcode(OAS, &nod, Z, nn);
+		regfree(&nod);
+		regfree(&nod1);
+		if(l->addable < INDEXED)
+			regfree(&nod2);
+		break;
+
+	asbitop:
+		regalloc(&nod4, n, nn);
+		if(l->complex >= r->complex) {
+			bitload(l, &nod, &nod1, &nod2, &nod4);
+			regalloc(&nod3, r, Z);
+			cgen(r, &nod3);
+		} else {
+			regalloc(&nod3, r, Z);
+			cgen(r, &nod3);
+			bitload(l, &nod, &nod1, &nod2, &nod4);
+		}
+		gmove(&nod, &nod4);
+		gopcode(o, &nod3, Z, &nod4);
+		regfree(&nod3);
+		gmove(&nod4, &nod);
+		regfree(&nod4);
+		bitstore(l, &nod, &nod1, &nod2, nn);
+		break;
+
+	case OADDR:
+		if(nn == Z) {
+			nullwarn(l, Z);
+			break;
+		}
+		lcgen(l, nn);
+		break;
+
+	case OFUNC:
+		if(l->complex >= FNX) {
+			if(l->op != OIND)
+				diag(n, "bad function call");
+
+			regret(&nod, l->left);
+			cgen(l->left, &nod);
+			regsalloc(&nod1, l->left);
+			gopcode(OAS, &nod, Z, &nod1);
+			regfree(&nod);
+
+			nod = *n;
+			nod.left = &nod2;
+			nod2 = *l;
+			nod2.left = &nod1;
+			nod2.complex = 1;
+			cgen(&nod, nn);
+
+			return;
+		}
+		o = reg[REGARG];
+		gargs(r, &nod, &nod1);
+		if(l->addable < INDEXED) {
+			reglcgen(&nod, l, Z);
+			gopcode(OFUNC, Z, Z, &nod);
+			regfree(&nod);
+		} else
+			gopcode(OFUNC, Z, Z, l);
+		if(REGARG)
+			if(o != reg[REGARG])
+				reg[REGARG]--;
+		if(nn != Z) {
+			regret(&nod, n);
+			gopcode(OAS, &nod, Z, nn);
+			regfree(&nod);
+		}
+		break;
+
+	case OIND:
+		if(nn == Z) {
+			nullwarn(l, Z);
+			break;
+		}
+		regialloc(&nod, n, nn);
+		r = l;
+		while(r->op == OADD)
+			r = r->right;
+		if(sconst(r)) {
+			v = r->vconst;
+			r->vconst = 0;
+			cgen(l, &nod);
+			nod.xoffset += v;
+			r->vconst = v;
+		} else
+			cgen(l, &nod);
+		regind(&nod, n);
+		gopcode(OAS, &nod, Z, nn);
+		regfree(&nod);
+		break;
+
+	case OEQ:
+	case ONE:
+	case OLE:
+	case OLT:
+	case OGE:
+	case OGT:
+	case OLO:
+	case OLS:
+	case OHI:
+	case OHS:
+		if(nn == Z) {
+			nullwarn(l, r);
+			break;
+		}
+		boolgen(n, 1, nn);
+		break;
+
+	case OANDAND:
+	case OOROR:
+		boolgen(n, 1, nn);
+		if(nn == Z)
+			patch(p, pc);
+		break;
+
+	case ONOT:
+		if(nn == Z) {
+			nullwarn(l, Z);
+			break;
+		}
+		boolgen(n, 1, nn);
+		break;
+
+	case OCOMMA:
+		cgen(l, Z);
+		cgen(r, nn);
+		break;
+
+	case OCAST:
+		if(nn == Z) {
+			nullwarn(l, Z);
+			break;
+		}
+		/*
+		 * convert from types l->n->nn
+		 */
+		if(nocast(l->type, n->type)) {
+			if(nocast(n->type, nn->type)) {
+				cgen(l, nn);
+				break;
+			}
+		}
+		regalloc(&nod, l, nn);
+		cgen(l, &nod);
+#ifdef maybe
+		if(l->op == ONAME || l->op == OINDREG || l->op == OIND)
+			if(typechlp[l->type->etype] && typeilp[nn->type->etype]){
+				/* load effectively does the cast */
+				nod.type = types[TLONG];
+				gopcode(OAS, &nod, Z, nn);
+				regfree(&nod);
+				break;
+			}
+#endif
+		regalloc(&nod1, n, &nod);
+		gopcode(OAS, &nod, Z, &nod1);
+		gopcode(OAS, &nod1, Z, nn);
+		regfree(&nod1);
+		regfree(&nod);
+		break;
+
+	case ODOT:
+		sugen(l, nodrat, l->type->width);
+		if(nn != Z) {
+			warn(n, "non-interruptable temporary");
+			nod = *nodrat;
+			if(!r || r->op != OCONST) {
+				diag(n, "DOT and no offset");
+				break;
+			}
+			nod.xoffset += (long)r->vconst;
+			nod.type = n->type;
+			cgen(&nod, nn);
+		}
+		break;
+
+	case OCOND:
+		bcgen(l, 1);
+		p1 = p;
+		cgen(r->left, nn);
+		gbranch(OGOTO);
+		patch(p1, pc);
+		p1 = p;
+		cgen(r->right, nn);
+		patch(p1, pc);
+		break;
+
+	case OPOSTINC:
+	case OPOSTDEC:
+		v = 1;
+		if(l->type->etype == TIND)
+			v = l->type->link->width;
+		if(o == OPOSTDEC)
+			v = -v;
+		if(l->op == OBIT)
+			goto bitinc;
+		if(nn == Z)
+			goto pre;
+
+		if(l->addable < INDEXED)
+			reglcgen(&nod2, l, Z);
+		else
+			nod2 = *l;
+
+		regalloc(&nod, l, nn);
+		gopcode(OAS, &nod2, Z, &nod);
+		regalloc(&nod1, l, Z);
+		if(typefd[l->type->etype]) {
+			regalloc(&nod3, l, Z);
+			if(v < 0) {
+				gopcode(OAS, nodfconst(-v), Z, &nod3);
+				gopcode(OSUB, &nod3, &nod, &nod1);
+			} else {
+				gopcode(OAS, nodfconst(v), Z, &nod3);
+				gopcode(OADD, &nod3, &nod, &nod1);
+			}
+			regfree(&nod3);
+		} else
+			gopcode(OADD, nodconst(v), &nod, &nod1);
+		gopcode(OAS, &nod1, Z, &nod2);
+
+		regfree(&nod);
+		regfree(&nod1);
+		if(l->addable < INDEXED)
+			regfree(&nod2);
+		break;
+
+	case OPREINC:
+	case OPREDEC:
+		v = 1;
+		if(l->type->etype == TIND)
+			v = l->type->link->width;
+		if(o == OPREDEC)
+			v = -v;
+		if(l->op == OBIT)
+			goto bitinc;
+
+	pre:
+		if(l->addable < INDEXED)
+			reglcgen(&nod2, l, Z);
+		else
+			nod2 = *l;
+
+		regalloc(&nod, l, nn);
+		gopcode(OAS, &nod2, Z, &nod);
+		if(typefd[l->type->etype]) {
+			regalloc(&nod3, l, Z);
+			if(v < 0) {
+				gopcode(OAS, nodfconst(-v), Z, &nod3);
+				gopcode(OSUB, &nod3, Z, &nod);
+			} else {
+				gopcode(OAS, nodfconst(v), Z, &nod3);
+				gopcode(OADD, &nod3, Z, &nod);
+			}
+			regfree(&nod3);
+		} else
+			gopcode(OADD, nodconst(v), Z, &nod);
+		gopcode(OAS, &nod, Z, &nod2);
+		if(nn && l->op == ONAME)	/* in x=++i, emit USED(i) */
+			gins(ANOP, l, Z);
+
+		regfree(&nod);
+		if(l->addable < INDEXED)
+			regfree(&nod2);
+		break;
+
+	bitinc:
+		if(nn != Z && (o == OPOSTINC || o == OPOSTDEC)) {
+			bitload(l, &nod, &nod1, &nod2, Z);
+			gopcode(OAS, &nod, Z, nn);
+			gopcode(OADD, nodconst(v), Z, &nod);
+			bitstore(l, &nod, &nod1, &nod2, Z);
+			break;
+		}
+		bitload(l, &nod, &nod1, &nod2, nn);
+		gopcode(OADD, nodconst(v), Z, &nod);
+		bitstore(l, &nod, &nod1, &nod2, nn);
+		break;
+	}
+	cursafe = curs;
+}
+
+void
+reglcgen(Node *t, Node *n, Node *nn)
+{
+	Node *r;
+	long v;
+
+	regialloc(t, n, nn);
+	if(n->op == OIND) {
+		r = n->left;
+		while(r->op == OADD)
+			r = r->right;
+		if(sconst(r)) {
+			v = r->vconst;
+			r->vconst = 0;
+			lcgen(n, t);
+			t->xoffset += v;
+			r->vconst = v;
+			regind(t, n);
+			return;
+		}
+	}
+	lcgen(n, t);
+	regind(t, n);
+}
+
+void
+lcgen(Node *n, Node *nn)
+{
+	Prog *p1;
+	Node nod;
+
+	if(debug['g']) {
+		prtree(nn, "lcgen lhs");
+		prtree(n, "lcgen");
+	}
+	if(n == Z || n->type == T)
+		return;
+	if(nn == Z) {
+		nn = &nod;
+		regalloc(&nod, n, Z);
+	}
+	switch(n->op) {
+	default:
+		if(n->addable < INDEXED) {
+			diag(n, "unknown op in lcgen: %O", n->op);
+			break;
+		}
+		nod = *n;
+		nod.op = OADDR;
+		nod.left = n;
+		nod.right = Z;
+		nod.type = types[TIND];
+		gopcode(OAS, &nod, Z, nn);
+		break;
+
+	case OCOMMA:
+		cgen(n->left, n->left);
+		lcgen(n->right, nn);
+		break;
+
+	case OIND:
+		cgen(n->left, nn);
+		break;
+
+	case OCOND:
+		bcgen(n->left, 1);
+		p1 = p;
+		lcgen(n->right->left, nn);
+		gbranch(OGOTO);
+		patch(p1, pc);
+		p1 = p;
+		lcgen(n->right->right, nn);
+		patch(p1, pc);
+		break;
+	}
+}
+
+/*
+ * Conditional branch if bool(n) != true
+ */
+void
+bcgen(Node *n, int true)
+{
+
+	if(n->type == T)
+		gbranch(OGOTO);
+	else
+		boolgen(n, true, Z);
+}
+
+/*
+ * If nn == Z, conditional branch if bool(n) != true
+ * If nn != Z, assign n = (bool(n) == true)
+ */
+void
+boolgen(Node *n, int true, Node *nn)
+{
+	int o;
+	Prog *p1, *p2;
+	Node *l, *r, nod, nod1, nod2;
+	long curs;
+
+	if(debug['g']) {
+		prtree(nn, "boolgen lhs");
+		prtree(n, true? "boolgen true" : "boolgen false");
+	}
+	curs = cursafe;
+	l = n->left;
+	r = n->right;
+	switch(n->op) {
+
+	default:
+		regalloc(&nod, n, nn);
+		cgen(n, &nod);
+		if(nn == Z) {
+			o = true? OEQ : ONE;
+			if(typefd[n->type->etype]) {
+				nodreg(&nod1, n, NREG+FREGZERO);
+				gopcode(o, &nod, &nod1, Z);
+			} else
+				gopcode(o, &nod, Z, Z);
+			regfree(&nod);
+			break;
+		}
+		if(typefd[n->type->etype]) {
+			regalloc(&nod2, nn, nn);
+			o = true? ONE : OEQ;
+			nodreg(&nod1, n, NREG+FREGZERO);
+			gopcode(o, &nod, &nod1, &nod2);
+			gopcode(OAS, &nod2, Z, nn);
+			regfree(&nod2);
+			regfree(&nod);
+			break;
+		}
+		if(true)
+			gopcode(OCOND, &nod, nodconst(0), &nod);
+		else
+			gopcode(OCOND, nodconst(1), &nod, &nod);
+		gopcode(OAS, &nod, Z, nn);
+		regfree(&nod);
+		break;
+
+	case OCONST:
+		o = vconst(n);
+		if(!true)
+			o = !o;
+		gbranch(OGOTO);
+		if(o) {
+			p1 = p;
+			gbranch(OGOTO);
+			patch(p1, pc);
+		}
+		goto com;
+
+	case OCOMMA:
+		cgen(l, Z);
+		boolgen(r, true, nn);
+		break;
+
+	case ONOT:
+		boolgen(l, !true, nn);
+		break;
+
+	case OCOND:
+		bcgen(l, 1);
+		p1 = p;
+		bcgen(r->left, true);
+		p2 = p;
+		gbranch(OGOTO);
+		patch(p1, pc);
+		p1 = p;
+		bcgen(r->right, !true);
+		patch(p2, pc);
+		p2 = p;
+		gbranch(OGOTO);
+		patch(p1, pc);
+		patch(p2, pc);
+		goto com;
+
+	case OANDAND:
+		if(!true)
+			goto caseor;
+
+	caseand:
+		bcgen(l, true);
+		p1 = p;
+		bcgen(r, !true);
+		p2 = p;
+		patch(p1, pc);
+		gbranch(OGOTO);
+		patch(p2, pc);
+		goto com;
+
+	case OOROR:
+		if(!true)
+			goto caseand;
+
+	caseor:
+		bcgen(l, !true);
+		p1 = p;
+		bcgen(r, !true);
+		p2 = p;
+		gbranch(OGOTO);
+		patch(p1, pc);
+		patch(p2, pc);
+		goto com;
+
+	case OEQ:
+	case ONE:
+	case OLE:
+	case OLT:
+	case OGE:
+	case OGT:
+	case OHI:
+	case OHS:
+	case OLO:
+	case OLS:
+		o = n->op;
+		if(l->complex >= FNX && r->complex >= FNX) {
+			regret(&nod, r);
+			cgen(r, &nod);
+			regsalloc(&nod1, r);
+			gopcode(OAS, &nod, Z, &nod1);
+			regfree(&nod);
+			nod = *n;
+			nod.right = &nod1;
+			boolgen(&nod, true, nn);
+			break;
+		}
+		if(true)
+			o = comrel[relindex(o)];
+		if(nn != Z || typefd[l->type->etype]) {
+			if(l->complex >= r->complex) {
+				regalloc(&nod1, l, nn);
+				cgen(l, &nod1);
+				regalloc(&nod, r, Z);
+				cgen(r, &nod);
+			} else {
+				regalloc(&nod, r, nn);
+				cgen(r, &nod);
+				regalloc(&nod1, l, Z);
+				cgen(l, &nod1);
+			}
+			if(typefd[l->type->etype]) {
+				if(nn != Z) {
+					/* fp compare for assignment */
+					regalloc(&nod2, nn, nn);
+					gopcode(o, &nod, &nod1, &nod2);
+					regfree(&nod2);
+				} else
+					/* fp compare for branch */
+					gopcode(o, &nod, &nod1, Z);
+				regfree(&nod);
+				regfree(&nod1);
+				break;
+			}
+			/* int compare for assignment */
+			switch(o) {
+			case OEQ:
+				gopcode(OSUB, &nod1, &nod, &nod);
+				gopcode(OCOND, &nod, nodconst(0), &nod);
+				break;
+			case ONE:
+				gopcode(OSUB, &nod1, &nod, &nod);
+				gopcode(OCOND, nodconst(1), &nod, &nod);
+				break;
+			case OLE:
+				gopcode(OCOMMA, &nod1, &nod, &nod);
+				break;
+			case OGT:
+				gopcode(OCOMMA, &nod1, &nod, &nod);
+				gopcode(OXOR, nodconst(1), &nod, &nod);
+				break;
+			case OLT:
+				gopcode(OCOMMA, &nod, &nod1, &nod);
+				gopcode(OXOR, nodconst(1), &nod, &nod);
+				break;
+			case OGE:
+				gopcode(OCOMMA, &nod, &nod1, &nod);
+				break;
+			case OLS:
+				gopcode(OCOND, &nod1, &nod, &nod);
+				break;
+			case OHI:
+				gopcode(OCOND, &nod1, &nod, &nod);
+				gopcode(OXOR, nodconst(1), &nod, &nod);
+				break;
+			case OLO:
+				gopcode(OCOND, &nod, &nod1, &nod);
+				gopcode(OXOR, nodconst(1), &nod, &nod);
+				break;
+			case OHS:
+				gopcode(OCOND, &nod, &nod1, &nod);
+				break;
+			}
+			gopcode(OAS, &nod, Z, nn);
+			regfree(&nod);
+			regfree(&nod1);
+			break;
+		}
+		/* int compare for branch */
+		if(0 && sconst(l)) {
+			if(l->vconst == 0) {
+				regalloc(&nod, r, nn);
+				cgen(r, &nod);
+				gopcode(o, l, &nod, Z);
+				regfree(&nod);
+				goto com;
+			}
+		}
+		if(0 && sconst(r)) {
+			if(r->vconst == 0) {
+				regalloc(&nod, l, nn);
+				cgen(l, &nod);
+				gopcode(o, &nod, r, Z);
+				regfree(&nod);
+				goto com;
+			}
+		}
+		if(l->complex >= r->complex) {
+			regalloc(&nod1, l, nn);
+			cgen(l, &nod1);
+			regalloc(&nod, r, Z);
+			cgen(r, &nod);
+		} else {
+			regalloc(&nod, r, nn);
+			cgen(r, &nod);
+			regalloc(&nod1, l, Z);
+			cgen(l, &nod1);
+		}
+		
+		gopcode(o, &nod, &nod1, Z);
+		regfree(&nod);
+		regfree(&nod1);
+
+	com:
+		if(nn != Z) {
+			p1 = p;
+			gopcode(OAS, nodconst(1), Z, nn);
+			gbranch(OGOTO);
+			p2 = p;
+			patch(p1, pc);
+			gopcode(OAS, nodconst(0), Z, nn);
+			patch(p2, pc);
+		}
+		break;
+	}
+	cursafe = curs;
+}
+
+void
+sugen(Node *n, Node *nn, long w)
+{
+	Prog *p1;
+	Node nod0, nod1, nod2, nod3, nod4, *l, *r;
+	Type *t;
+	long pc1;
+	int i, m, c;
+
+	if(n == Z || n->type == T)
+		return;
+	if(debug['g']) {
+		prtree(nn, "sugen lhs");
+		prtree(n, "sugen");
+	}
+	if(nn == nodrat)
+		if(w > nrathole)
+			nrathole = w;
+	switch(n->op) {
+	case OIND:
+		if(nn == Z) {
+			nullwarn(n->left, Z);
+			break;
+		}
+
+	default:
+		goto copy;
+
+	case OCONST:
+		if(n->type && typev[n->type->etype]) {
+			if(nn == Z) {
+				nullwarn(n->left, Z);
+				break;
+			}
+
+			t = nn->type;
+			nn->type = types[TLONG];
+			reglcgen(&nod1, nn, Z);
+			nn->type = t;
+
+			gopcode(OAS, nod32const(n->vconst), Z, &nod1);
+			nod1.xoffset += SZ_LONG;
+			gopcode(OAS, nod32const(n->vconst>>32), Z, &nod1);
+
+			regfree(&nod1);
+			break;
+		}
+		goto copy;
+
+	case ODOT:
+		l = n->left;
+		sugen(l, nodrat, l->type->width);
+		if(nn != Z) {
+			warn(n, "non-interruptable temporary");
+			nod1 = *nodrat;
+			r = n->right;
+			if(!r || r->op != OCONST) {
+				diag(n, "DOT and no offset");
+				break;
+			}
+			nod1.xoffset += (long)r->vconst;
+			nod1.type = n->type;
+			sugen(&nod1, nn, w);
+		}
+		break;
+
+	case OSTRUCT:
+		/*
+		 * rewrite so lhs has no fn call
+		 */
+		if(nn != Z && nn->complex >= FNX) {
+			nod1 = *n;
+			nod1.type = typ(TIND, n->type);
+			regret(&nod2, &nod1);
+			lcgen(nn, &nod2);
+			regsalloc(&nod0, &nod1);
+			gopcode(OAS, &nod2, Z, &nod0);
+			regfree(&nod2);
+
+			nod1 = *n;
+			nod1.op = OIND;
+			nod1.left = &nod0;
+			nod1.right = Z;
+			nod1.complex = 1;
+
+			sugen(n, &nod1, w);
+			return;
+		}
+
+		r = n->left;
+		for(t = n->type->link; t != T; t = t->down) {
+			l = r;
+			if(r->op == OLIST) {
+				l = r->left;
+				r = r->right;
+			}
+			if(nn == Z) {
+				cgen(l, nn);
+				continue;
+			}
+			/*
+			 * hand craft *(&nn + o) = l
+			 */
+			nod0 = znode;
+			nod0.op = OAS;
+			nod0.type = t;
+			nod0.left = &nod1;
+			nod0.right = l;
+
+			nod1 = znode;
+			nod1.op = OIND;
+			nod1.type = t;
+			nod1.left = &nod2;
+
+			nod2 = znode;
+			nod2.op = OADD;
+			nod2.type = typ(TIND, t);
+			nod2.left = &nod3;
+			nod2.right = &nod4;
+
+			nod3 = znode;
+			nod3.op = OADDR;
+			nod3.type = nod2.type;
+			nod3.left = nn;
+
+			nod4 = znode;
+			nod4.op = OCONST;
+			nod4.type = nod2.type;
+			nod4.vconst = t->offset;
+
+			ccom(&nod0);
+			acom(&nod0);
+			xcom(&nod0);
+			nod0.addable = 0;
+
+			cgen(&nod0, Z);
+		}
+		break;
+
+	case OAS:
+		if(nn == Z) {
+			if(n->addable < INDEXED)
+				sugen(n->right, n->left, w);
+			break;
+		}
+		sugen(n->right, nodrat, w);
+		warn(n, "non-interruptable temporary");
+		sugen(nodrat, n->left, w);
+		sugen(nodrat, nn, w);
+		break;
+
+	case OFUNC:
+		if(nn == Z) {
+			sugen(n, nodrat, w);
+			break;
+		}
+		if(nn->op != OIND) {
+			nn = new1(OADDR, nn, Z);
+			nn->type = types[TIND];
+			nn->addable = 0;
+		} else
+			nn = nn->left;
+		n = new(OFUNC, n->left, new(OLIST, nn, n->right));
+		n->type = types[TVOID];
+		n->left->type = types[TVOID];
+		cgen(n, Z);
+		break;
+
+	case OCOND:
+		bcgen(n->left, 1);
+		p1 = p;
+		sugen(n->right->left, nn, w);
+		gbranch(OGOTO);
+		patch(p1, pc);
+		p1 = p;
+		sugen(n->right->right, nn, w);
+		patch(p1, pc);
+		break;
+
+	case OCOMMA:
+		cgen(n->left, Z);
+		sugen(n->right, nn, w);
+		break;
+	}
+	return;
+
+copy:
+	if(nn == Z)
+		return;
+	if(n->complex >= FNX && nn->complex >= FNX) {
+		t = nn->type;
+		nn->type = types[TLONG];
+		regialloc(&nod1, nn, Z);
+		lcgen(nn, &nod1);
+		regsalloc(&nod2, nn);
+		nn->type = t;
+
+		gopcode(OAS, &nod1, Z, &nod2);
+		regfree(&nod1);
+
+		nod2.type = typ(TIND, t);
+
+		nod1 = nod2;
+		nod1.op = OIND;
+		nod1.left = &nod2;
+		nod1.right = Z;
+		nod1.complex = 1;
+		nod1.type = t;
+
+		sugen(n, &nod1, w);
+		return;
+	}
+
+	if(n->complex > nn->complex) {
+		t = n->type;
+		n->type = types[TLONG];
+		reglcgen(&nod1, n, Z);
+		n->type = t;
+
+		t = nn->type;
+		nn->type = types[TLONG];
+		reglcgen(&nod2, nn, Z);
+		nn->type = t;
+	} else {
+		t = nn->type;
+		nn->type = types[TLONG];
+		reglcgen(&nod2, nn, Z);
+		nn->type = t;
+
+		t = n->type;
+		n->type = types[TLONG];
+		reglcgen(&nod1, n, Z);
+		n->type = t;
+	}
+
+	w /= SZ_LONG;
+	if(w <= 5) {
+		layout(&nod1, &nod2, w, 0, Z);
+		goto out;
+	}
+
+	/*
+	 * minimize space for unrolling loop
+	 * 3,4,5 times. (6 or more is never minimum)
+	 * if small structure, try 2 also.
+	 */
+	c = 0; /* set */
+	m = 100;
+	i = 3;
+	if(w <= 15)
+		i = 2;
+	for(; i<=5; i++)
+		if(i + w%i <= m) {
+			c = i;
+			m = c + w%c;
+		}
+
+	regalloc(&nod3, &regnode, Z);
+	layout(&nod1, &nod2, w%c, w/c, &nod3);
+	
+	pc1 = pc;
+	layout(&nod1, &nod2, c, 0, Z);
+
+	gopcode(OSUB, nodconst(1), Z, &nod3);
+	nod1.op = OREGISTER;
+	nod1.type = types[TIND];
+	gopcode(OADD, nodconst(c*SZ_LONG), Z, &nod1);
+	nod2.op = OREGISTER;
+	nod2.type = types[TIND];
+	gopcode(OADD, nodconst(c*SZ_LONG), Z, &nod2);
+	
+	gopcode(OEQ, &nod3, Z, Z);
+	p->as = ABGT;
+	patch(p, pc1);
+
+	regfree(&nod3);
+out:
+	regfree(&nod1);
+	regfree(&nod2);
+}
+
+void
+layout(Node *f, Node *t, int c, int cv, Node *cn)
+{
+	Node t1, t2;
+
+	while(c > 3) {
+		layout(f, t, 2, 0, Z);
+		c -= 2;
+	}
+
+	regalloc(&t1, &regnode, Z);
+	regalloc(&t2, &regnode, Z);
+	t1.type = types[TLONG];
+	t2.type = types[TLONG];
+	if(c > 0) {
+		gopcode(OAS, f, Z, &t1);
+		f->xoffset += SZ_LONG;
+	}
+	if(cn != Z)
+		gopcode(OAS, nodconst(cv), Z, cn);
+	if(c > 1) {
+		gopcode(OAS, f, Z, &t2);
+		f->xoffset += SZ_LONG;
+	}
+	if(c > 0) {
+		gopcode(OAS, &t1, Z, t);
+		t->xoffset += SZ_LONG;
+	}
+	if(c > 2) {
+		gopcode(OAS, f, Z, &t1);
+		f->xoffset += SZ_LONG;
+	}
+	if(c > 1) {
+		gopcode(OAS, &t2, Z, t);
+		t->xoffset += SZ_LONG;
+	}
+	if(c > 2) {
+		gopcode(OAS, &t1, Z, t);
+		t->xoffset += SZ_LONG;
+	}
+	regfree(&t1);
+	regfree(&t2);
+}
--- /dev/null
+++ b/sys/src/cmd/jc/gc.h
@@ -1,0 +1,337 @@
+#include	"../cc/cc.h"
+#include	"../jc/j.out.h"
+
+/*
+ * [ij]c/riscv
+ * RISC-V
+ */
+#define	SZ_CHAR		1
+#define	SZ_SHORT	2
+#define	SZ_INT		4
+#define	SZ_LONG		4
+#define	SZ_IND		4
+#define	SZ_FLOAT	4
+#define	SZ_VLONG	8
+#define	SZ_DOUBLE	8
+#define	FNX		100
+
+typedef	struct	Adr	Adr;
+typedef	struct	Prog	Prog;
+typedef	struct	Case	Case;
+typedef	struct	C1	C1;
+typedef	struct	Multab	Multab;
+typedef	struct	Hintab	Hintab;
+typedef	struct	Var	Var;
+typedef	struct	Reg	Reg;
+typedef	struct	Rgn	Rgn;
+
+struct	Adr
+{
+	long	offset;
+	double	dval;
+	char	sval[NSNAME];
+	Ieee	ieee;
+
+	Sym*	sym;
+	char	type;
+	char	reg;
+	char	name;
+	char	etype;
+};
+#define	A	((Adr*)0)
+
+#define	INDEXED	9
+struct	Prog
+{
+	Adr	from;
+	Adr	to;
+	Prog*	link;
+	long	lineno;
+	char	as;
+	char	reg;
+};
+#define	P	((Prog*)0)
+
+struct	Case
+{
+	Case*	link;
+	vlong	val;
+	long	label;
+	char	def;
+	char isv;
+};
+#define	C	((Case*)0)
+
+struct	C1
+{
+	vlong	val;
+	long	label;
+};
+
+struct	Multab
+{
+	long	val;
+	char	code[20];
+};
+
+struct	Hintab
+{
+	ushort	val;
+	char	hint[10];
+};
+
+struct	Var
+{
+	long	offset;
+	Sym*	sym;
+	char	name;
+	char	etype;
+};
+
+struct	Reg
+{
+	long	pc;
+	long	rpo;		/* reverse post ordering */
+
+	Bits	set;
+	Bits	use1;
+	Bits	use2;
+
+	Bits	refbehind;
+	Bits	refahead;
+	Bits	calbehind;
+	Bits	calahead;
+	Bits	regdiff;
+	Bits	act;
+
+	long	regu;
+	long	loop;		/* could be shorter */
+
+	Reg*	log5;
+	long	active;
+
+	Reg*	p1;
+	Reg*	p2;
+	Reg*	p2link;
+	Reg*	s1;
+	Reg*	s2;
+	Reg*	link;
+	Prog*	prog;
+};
+#define	R	((Reg*)0)
+
+#define	NRGN	1000		/* was 600; raised for paranoia.c */
+struct	Rgn
+{
+	Reg*	enter;
+	short	cost;
+	short	varno;
+	short	regno;
+};
+
+EXTERN	long	breakpc;
+EXTERN	long	nbreak;
+EXTERN	Case*	cases;
+EXTERN	Node	constnode;
+EXTERN	Node	fconstnode;
+EXTERN	Node	vconstnode;
+EXTERN	long	continpc;
+EXTERN	long	curarg;
+EXTERN	long	cursafe;
+EXTERN	Prog*	firstp;
+EXTERN	Prog*	lastp;
+EXTERN	long	maxargsafe;
+EXTERN	int	mnstring;
+EXTERN	Multab	multab[20];
+EXTERN	int	hintabsize;
+EXTERN	Node*	nodrat;
+EXTERN	Node*	nodret;
+EXTERN	Node*	nodsafe;
+EXTERN	long	nrathole;
+EXTERN	int	maxregalloc;
+EXTERN	long	nstring;
+EXTERN	Prog*	p;
+EXTERN	long	pc;
+EXTERN	Node	regnode;
+EXTERN	Node	vregnode;
+EXTERN	char	string[NSNAME];
+EXTERN	Sym*	symrathole;
+EXTERN	Node	znode;
+EXTERN	Prog	zprog;
+EXTERN	int	reg[NREG+NREG];
+EXTERN	long	exregoffset;
+EXTERN	long	exfregoffset;
+
+#define	BLOAD(r)	band(bnot(r->refbehind), r->refahead)
+#define	BSTORE(r)	band(bnot(r->calbehind), r->calahead)
+#define	LOAD(r)		(~r->refbehind.b[z] & r->refahead.b[z])
+#define	STORE(r)	(~r->calbehind.b[z] & r->calahead.b[z])
+
+#define	bset(a,n)	((a).b[(n)/32]&(1L<<(n)%32))
+
+#define	CLOAD	4
+#define	CREF	5
+#define	CINF	1000
+#define	LOOP	3
+
+EXTERN	Rgn	region[NRGN];
+EXTERN	Rgn*	rgp;
+EXTERN	int	nregion;
+EXTERN	int	nvar;
+
+EXTERN	Bits	externs;
+EXTERN	Bits	params;
+EXTERN	Bits	consts;
+EXTERN	Bits	addrs;
+
+EXTERN	long	regbits;
+EXTERN	long	exregbits;
+
+EXTERN	int	change;
+EXTERN	int	suppress;
+
+EXTERN	Reg*	firstr;
+EXTERN	Reg*	lastr;
+EXTERN	Reg	zreg;
+EXTERN	Reg*	freer;
+EXTERN	Var	var[NVAR];
+EXTERN	long*	idom;
+EXTERN	Reg**	rpo2r;
+EXTERN	long	maxnr;
+
+extern	char*	anames[];
+extern	Hintab	hintab[];
+
+/*
+ * sgen.c
+ */
+void	codgen(Node*, Node*);
+void	gen(Node*);
+void	noretval(int);
+void	xcom(Node*);
+int	bcomplex(Node*, Node*);
+void	usedset(Node*, int);
+
+/*
+ * cgen.c
+ */
+void	cgen(Node*, Node*);
+void	reglcgen(Node*, Node*, Node*);
+void	lcgen(Node*, Node*);
+void	bcgen(Node*, int);
+void	boolgen(Node*, int, Node*);
+void	sugen(Node*, Node*, long);
+void	layout(Node*, Node*, int, int, Node*);
+
+/*
+ * txt.c
+ */
+void	ginit(void);
+void	gclean(void);
+void	nextpc(void);
+void	gargs(Node*, Node*, Node*);
+void	garg1(Node*, Node*, Node*, int, Node**);
+Node*	nodconst(long);
+Node*	nod32const(vlong);
+Node*	nodfconst(double);
+Node*	nodgconst(vlong, Type*);
+void	nodreg(Node*, Node*, int);
+void	regret(Node*, Node*);
+void	regalloc(Node*, Node*, Node*);
+void	regfree(Node*);
+void	regialloc(Node*, Node*, Node*);
+void	regsalloc(Node*, Node*);
+void	regaalloc1(Node*, Node*);
+void	regaalloc(Node*, Node*);
+void	regind(Node*, Node*);
+void	gprep(Node*, Node*);
+void	raddr(Node*, Prog*);
+void	naddr(Node*, Adr*);
+void	gmove(Node*, Node*);
+void	gins(int a, Node*, Node*);
+void	gopcode(int, Node*, Node*, Node*);
+int	samaddr(Node*, Node*);
+void	gbranch(int);
+void	patch(Prog*, long);
+int	sconst(Node*);
+int	sval(long);
+void	gpseudo(int, Sym*, Node*);
+
+/*
+ * swt.c
+ */
+int	swcmp(void*, void*);
+void	doswit(Node*);
+void	swit1(C1*, int, long, Node*);
+void	swit2(C1*, int, long, Node*, Node*);
+void	casf(void);
+void	bitload(Node*, Node*, Node*, Node*, Node*);
+void	bitstore(Node*, Node*, Node*, Node*, Node*);
+long	outstring(char*, long);
+int	mulcon(Node*, Node*);
+Multab*	mulcon0(long);
+void	nullwarn(Node*, Node*);
+void	gextern(Sym*, Node*, long, long);
+void	outcode(void);
+void	ieeedtod(Ieee*, double);
+
+/*
+ * list
+ */
+void	listinit(void);
+int	Pconv(Fmt*);
+int	Aconv(Fmt*);
+int	Dconv(Fmt*);
+int	Sconv(Fmt*);
+int	Nconv(Fmt*);
+int	Bconv(Fmt*);
+
+/*
+ * reg.c
+ */
+Reg*	rega(void);
+int	rcmp(void*, void*);
+void	regopt(Prog*);
+void	addmove(Reg*, int, int, int);
+Bits	mkvar(Adr*, int);
+void	prop(Reg*, Bits, Bits);
+void	loopit(Reg*, long);
+void	synch(Reg*, Bits);
+ulong	allreg(ulong, Rgn*);
+void	paint1(Reg*, int);
+ulong	paint2(Reg*, int);
+void	paint3(Reg*, int, long, int);
+void	addreg(Adr*, int);
+
+/*
+ * peep.c
+ */
+void	peep(void);
+void	excise(Reg*);
+Reg*	uniqp(Reg*);
+Reg*	uniqs(Reg*);
+int	regtyp(Adr*);
+int	regzer(Adr*);
+int	anyvar(Adr*);
+int	subprop(Reg*);
+int	copyprop(Reg*);
+int	copy1(Adr*, Adr*, Reg*, int);
+int	copyu(Prog*, Adr*, Adr*);
+
+int	copyas(Adr*, Adr*);
+int	copyau(Adr*, Adr*);
+int	copyau1(Prog*, Adr*);
+int	copysub(Adr*, Adr*, Adr*, int);
+int	copysub1(Prog*, Adr*, Adr*, int);
+
+long	RtoB(int);
+long	FtoB(int);
+int	BtoR(long);
+int	BtoF(long);
+
+#pragma	varargck	type	"A"	int
+#pragma	varargck	type	"B"	Bits
+#pragma	varargck	type	"D"	Adr*
+#pragma	varargck	type	"N"	Adr*
+#pragma	varargck	type	"P"	Prog*
+#pragma	varargck	type	"S"	char*
--- /dev/null
+++ b/sys/src/cmd/jc/j.out.h
@@ -1,0 +1,225 @@
+#define	NSNAME	8
+#define	NSYM	50
+#define	NREG	32
+#define NOPROF	(1<<0)
+#define DUPOK	(1<<1)
+
+/*
+ * Register roles are influenced by the compressed extension:
+ *	CIW, CL, CS and CB format use only R8-R15
+ *	CL and CS floating load/store use only F8-F15
+ *	CI and CSS load/store assume stack pointer is R2
+ *	C.JAL assumes link register is R1
+ */
+enum
+{
+	REGZERO		= 0,	/* always zero */
+	REGLINK		= 1,	/* call return address */
+	REGSP		= 2,	/* stack pointer */
+	REGSB		= 3,	/* static base */
+	REGTMP		= 4,	/* assembler temporary */
+	REGEXT		= 7,	/* extern reg from here down */
+	REGRET		= 8,	/* fn return value */
+	REGARG		= 8,	/* fn arg value */
+	REGLOWALLOC	= 9,	/* first reg to allocate */
+	REGALLOC	= 31,	/* highest reg to allocate (15 for RV32E) */
+
+	FREGRET		= 0,	/* fn return value */
+	FREGEXT		= 27,	/* extern reg from here down */
+	FREGZERO	= 28,
+	FREGHALF	= 29,
+	FREGONE		= 30,
+	FREGTWO		= 31,
+};
+
+enum	as
+{
+	AXXX = 0,
+
+	/* processor instructions */
+	AADD,
+	AADDW,
+	AAMO_D,
+	AAMO_W,
+	AAND,
+	ABEQ,
+	ABGE,
+	ABGEU,
+	ABLT,
+	ABLTU,
+	ABNE,
+	ACSRRC,
+	ACSRRCI,
+	ACSRRS,
+	ACSRRSI,
+	ACSRRW,
+	ACSRRWI,
+	ADIV,
+	ADIVU,
+	ADIVUW,
+	ADIVW,
+	AFENCE,
+	AFENCE_I,
+	AJAL,
+	AJALR,
+	ALR_D,
+	ALR_W,
+	ALUI,
+	AMOVB,
+	AMOVBU,
+	AMOVH,
+	AMOVHU,
+	AMOV,
+	AMOVW,
+	AMOVWU,
+	AMUL,
+	AMULH,
+	AMULHSU,
+	AMULHU,
+	AMULW,
+	AOR,
+	AREM,
+	AREMU,
+	AREMUW,
+	AREMW,
+	ASC_D,
+	ASC_W,
+	ASLL,
+	ASLLW,
+	ASLT,
+	ASLTU,
+	ASRA,
+	ASRAW,
+	ASRL,
+	ASRLW,
+	ASUB,
+	ASUBW,
+	ASWAP_D,
+	ASWAP_W,
+	ASYS,
+	AXOR,
+
+	/* floating point */
+	AMOVF,      /* FLW, FSW, FSGNJ.S */
+	AMOVD,      /* FLD, FSD, FSGNJ.D */
+	AMOVFD,     /* FCVT.D.S */
+	AMOVDF,     /* FCVT.S.D */
+	AMOVWF,     /* FCVT.S.W */
+	AMOVUF,     /* FCVT.S.WU */
+	AMOVFW,     /* FCVT.W.S */
+	AMOVWD,     /* FCVT.D.W */
+	AMOVUD,     /* FCVT.D.WU */
+	AMOVDW,     /* FCVT.W.D */
+	AADDF,      /* FADD.S */
+	AADDD,      /* FADD.D */
+	ASUBF,      /* FSUB.S */
+	ASUBD,      /* FSUB.D */
+	AMULF,      /* FMUL.S */
+	AMULD,      /* FMUL.D */
+	ADIVF,      /* FDIV.S */
+	ADIVD,      /* FDIV.D */
+	ACMPLTF,     /* FLT.S */
+	ACMPLTD,     /* FLT.D */
+	ACMPEQF,     /* FEQ.S */
+	ACMPEQD,     /* FEQ.D */
+	ACMPLEF,     /* FLE.S */
+	ACMPLED,     /* FLE.S */
+
+	/* floating point instructions not included */
+/*
+	FMADD.S    FMADD.D
+	FMSUB.S    FMSUB.D
+	FNMSUB.S   FNMSUB.D
+	FNMADD.S   FNMADD.D
+	FSQRT.S    FSQRT.D
+	FSGNJ.S    FSGNJ.D
+	FSGNJN.S   FSGNJN.D
+	FSGNNX.S   FSGNNX.D
+	FMIN.S     FMIN.D
+	FMAX.S     FMAX.D
+	FMV.X.W
+	FCLASS.S   FCLASS.D
+	FCVT.WU.S  FCVT.WU.D
+	FMV.W.X
+ */
+
+
+	/* pseudo-ops */
+	ABGT,
+	ABGTU,
+	ABLE,
+	ABLEU,
+	ASGT,
+	ASGTU,
+	AJMP,
+	ARET,
+	ANOP,
+
+	/* C compiler pseudo-ops */
+	ADATA,
+	AGLOBL,
+	AGOK,
+	AHISTORY,
+	ANAME,
+	ATEXT,
+	AWORD,
+	AEND,
+	ADYNT,
+	AINIT,
+	ASIGNAME,
+
+	/* RV64 extension */
+	ADWORD,
+	AMOVFV,
+	AMOVDV,
+	AMOVVF,
+	AMOVUVF,
+	AMOVVD,
+	AMOVUVD,
+
+	ALAST,
+};
+
+/* type/name */
+enum
+{
+	D_GOK	= 0,
+	D_NONE,
+
+/* name */
+	D_EXTERN,
+	D_STATIC,
+	D_AUTO,
+	D_PARAM,
+
+/* type */
+	D_BRANCH,
+	D_OREG,
+	D_CONST,
+	D_FCONST,
+	D_SCONST,
+	D_REG,
+	D_CTLREG,
+	D_FREG,
+	D_FCREG,
+	D_FILE,
+	D_FILE1,
+	D_VCONST,
+};
+
+/*
+ * this is the ranlib header
+ */
+#define	SYMDEF	"__.SYMDEF"
+
+/*
+ * this is the simulated IEEE floating point
+ */
+typedef	struct	ieee	Ieee;
+struct	ieee
+{
+	long	l;	/* contains ls-man	0xffffffff */
+	long	h;	/* contains sign	0x80000000
+				    exp		0x7ff00000
+				    ms-man	0x000fffff */
+};
--- /dev/null
+++ b/sys/src/cmd/jc/list.c
@@ -1,0 +1,230 @@
+#define EXTERN
+#include "gc.h"
+
+void
+listinit(void)
+{
+	fmtinstall('A', Aconv);
+	fmtinstall('P', Pconv);
+	fmtinstall('S', Sconv);
+	fmtinstall('N', Nconv);
+	fmtinstall('B', Bconv);
+	fmtinstall('D', Dconv);
+}
+
+int
+Bconv(Fmt *fp)
+{
+	char str[STRINGSZ], ss[STRINGSZ], *s;
+	Bits bits;
+	int i;
+
+	str[0] = 0;
+	bits = va_arg(fp->args, Bits);
+	while(bany(&bits)) {
+		i = bnum(bits);
+		if(str[0])
+			strcat(str, " ");
+		if(var[i].sym == S) {
+			sprint(ss, "$%ld", var[i].offset);
+			s = ss;
+		} else
+			s = var[i].sym->name;
+		if(strlen(str) + strlen(s) + 1 >= STRINGSZ)
+			break;
+		strcat(str, s);
+		bits.b[i/32] &= ~(1L << (i%32));
+	}
+	return fmtstrcpy(fp, str);
+}
+
+int
+Pconv(Fmt *fp)
+{
+	char str[STRINGSZ];
+	Prog *p;
+	int a;
+
+	p = va_arg(fp->args, Prog*);
+	a = p->as;
+	if(a == ADATA)
+		sprint(str, "	%A	%D/%d,%D", a, &p->from, p->reg, &p->to);
+	else
+	if(p->as == ATEXT)
+		sprint(str, "	%A	%D,%d,%D", a, &p->from, p->reg, &p->to);
+	else
+	if(p->reg == NREG)
+		sprint(str, "	%A	%D,%D", a, &p->from, &p->to);
+	else
+	if(p->from.type != D_FREG)
+		sprint(str, "	%A	%D,R%d,%D", a, &p->from, p->reg, &p->to);
+	else
+		sprint(str, "	%A	%D,F%d,%D", a, &p->from, p->reg, &p->to);
+	return fmtstrcpy(fp, str);
+}
+
+int
+Aconv(Fmt *fp)
+{
+	char *s;
+	int a;
+
+	a = va_arg(fp->args, int);
+	s = "???";
+	if(a >= AXXX && a < ALAST)
+		s = anames[a];
+	return fmtstrcpy(fp, s);
+}
+
+int
+Dconv(Fmt *fp)
+{
+	char str[STRINGSZ];
+	Adr *a;
+
+	a = va_arg(fp->args, Adr*);
+	switch(a->type) {
+
+	default:
+		sprint(str, "GOK-type(%d)", a->type);
+		break;
+
+	case D_NONE:
+		str[0] = 0;
+		if(a->name != D_NONE || a->reg != NREG || a->sym != S)
+			sprint(str, "%N(R%d)(NONE)", a, a->reg);
+		break;
+
+	case D_VCONST:
+	case D_CONST:
+		if(a->reg != NREG)
+			sprint(str, "$%N(R%d)", a, a->reg);
+		else
+			sprint(str, "$%N", a);
+		break;
+
+	case D_OREG:
+		if(a->reg != NREG)
+			sprint(str, "%N(R%d)", a, a->reg);
+		else
+			sprint(str, "%N", a);
+		break;
+
+	case D_REG:
+		sprint(str, "R%d", a->reg);
+		if(a->name != D_NONE || a->sym != S)
+			sprint(str, "%N(R%d)(REG)", a, a->reg);
+		break;
+
+	case D_FREG:
+		sprint(str, "F%d", a->reg);
+		if(a->name != D_NONE || a->sym != S)
+			sprint(str, "%N(R%d)(FREG)", a, a->reg);
+		break;
+
+	case D_BRANCH:
+		sprint(str, "%ld(PC)", a->offset-pc);
+		break;
+
+	case D_FCONST:
+		sprint(str, "$%.17e", a->dval);
+		break;
+
+	case D_SCONST:
+		sprint(str, "$\"%S\"", a->sval);
+		break;
+	}
+	return fmtstrcpy(fp, str);
+}
+
+int
+Sconv(Fmt *fp)
+{
+	int i, c;
+	char str[STRINGSZ], *p, *a;
+
+	a = va_arg(fp->args, char*);
+	p = str;
+	for(i=0; i<NSNAME; i++) {
+		c = a[i] & 0xff;
+		if(c >= 'a' && c <= 'z' ||
+		   c >= 'A' && c <= 'Z' ||
+		   c >= '0' && c <= '9' ||
+		   c == ' ' || c == '%') {
+			*p++ = c;
+			continue;
+		}
+		*p++ = '\\';
+		switch(c) {
+		case 0:
+			*p++ = 'z';
+			continue;
+		case '\\':
+		case '"':
+			*p++ = c;
+			continue;
+		case '\n':
+			*p++ = 'n';
+			continue;
+		case '\t':
+			*p++ = 't';
+			continue;
+		case '\r':
+			*p++ = 'r';
+			continue;
+		case '\f':
+			*p++ = 'f';
+			continue;
+		}
+		*p++ = (c>>6) + '0';
+		*p++ = ((c>>3) & 7) + '0';
+		*p++ = (c & 7) + '0';
+	}
+	*p = 0;
+	return fmtstrcpy(fp, str);
+}
+
+int
+Nconv(Fmt *fp)
+{
+	char str[STRINGSZ];
+	Adr *a;
+	Sym *s;
+
+	a = va_arg(fp->args, Adr*);
+	s = a->sym;
+	if(s == S) {
+		if(a->type == D_VCONST)
+			sprint(str, "%lld", *(vlong*)a->sval);
+		else
+			sprint(str, "%ld", a->offset);
+		goto out;
+	}
+	switch(a->name) {
+	default:
+		sprint(str, "GOK-name(%d)", a->name);
+		break;
+
+	case D_NONE:
+		sprint(str, "%ld", a->offset);
+		break;
+
+	case D_EXTERN:
+		sprint(str, "%s+%ld(SB)", s->name, a->offset);
+		break;
+
+	case D_STATIC:
+		sprint(str, "%s<>+%ld(SB)", s->name, a->offset);
+		break;
+
+	case D_AUTO:
+		sprint(str, "%s-%ld(SP)", s->name, -a->offset);
+		break;
+
+	case D_PARAM:
+		sprint(str, "%s+%ld(FP)", s->name, a->offset);
+		break;
+	}
+out:
+	return fmtstrcpy(fp, str);
+}
--- /dev/null
+++ b/sys/src/cmd/jc/machcap.c
@@ -1,0 +1,9 @@
+#include "gc.h"
+
+int
+machcap(Node *n)
+{
+	if(n == Z)	/* test */
+		return thechar == 'j';
+	return 0;
+}
--- /dev/null
+++ b/sys/src/cmd/jc/mkenam
@@ -1,0 +1,15 @@
+ed - ../jc/j.out.h <<'!'
+v/^	A/d
+,s/^	A/	"/
+g/ .*$/s///
+,s/,*$/",/
+1i
+char*	anames[] =
+{
+.
+$a
+};
+.
+w enam.c
+Q
+!
--- /dev/null
+++ b/sys/src/cmd/jc/mkfile
@@ -1,0 +1,41 @@
+</$objtype/mkfile
+
+TARG=jc
+
+OFILES=\
+	cgen.$O\
+	enam.$O\
+	list.$O\
+	machcap.$O\
+	mul.$O\
+	peep.$O\
+	pgen.$O\
+	pswt.$O\
+	reg.$O\
+	sgen.$O\
+	swt.$O\
+	txt.$O\
+	lex.$O\
+
+HFILES=\
+	gc.h\
+	j.out.h\
+	../cc/cc.h\
+
+LIB=../cc/cc.a$O
+
+BIN=/$objtype/bin
+</sys/src/cmd/mkone
+
+$LIB:	../cc/cc.h
+	cd ../cc
+	mk install
+
+lex.$O: ../cc/lex.c ../cc/y.tab.h
+	$CC -Dmain'='ccmain $CFLAGS ../cc/lex.c
+
+%.$O: ../cc/%.c
+	$CC $CFLAGS ../cc/$stem.c
+
+enam.c:	j.out.h
+	rc mkenam
--- /dev/null
+++ b/sys/src/cmd/jc/mul.c
@@ -1,0 +1,608 @@
+#include "gc.h"
+
+/*
+ * code sequences for multiply by constant.
+ * [a-l][0-3]
+ *	lsl	$(A-'a'),r0,r1
+ * [+][0-7]
+ *	add	r0,r1,r2
+ * [-][0-7]
+ *	sub	r0,r1,r2
+ */
+
+static	int	multabp;
+static	long	mulval;
+static	char*	mulcp;
+static	long	valmax;
+static	int	shmax;
+
+static int	docode(char *hp, char *cp, int r0, int r1);
+static int	gen1(int len);
+static int	gen2(int len, long r1);
+static int	gen3(int len, long r0, long r1, int flag);
+enum
+{
+	SR1	= 1<<0,		/* r1 has been shifted */
+	SR0	= 1<<1,		/* r0 has been shifted */
+	UR1	= 1<<2,		/* r1 has not been used */
+	UR0	= 1<<3,		/* r0 has not been used */
+};
+
+Multab*
+mulcon0(long v)
+{
+	int a1, a2, g;
+	Multab *m, *m1;
+	char hint[10];
+
+	if(v < 0)
+		v = -v;
+
+	/*
+	 * look in cache
+	 */
+	m = multab;
+	for(g=0; g<nelem(multab); g++) {
+		if(m->val == v) {
+			if(m->code[0] == 0)
+				return 0;
+			return m;
+		}
+		m++;
+	}
+
+	/*
+	 * select a spot in cache to overwrite
+	 */
+	multabp++;
+	if(multabp < 0 || multabp >= nelem(multab))
+		multabp = 0;
+	m = multab+multabp;
+	m->val = v;
+	mulval = v;
+
+	/*
+	 * look in execption hint table
+	 */
+	a1 = 0;
+	a2 = hintabsize;
+	for(;;) {
+		if(a1 >= a2)
+			goto no;
+		g = (a2 + a1)/2;
+		if(v < hintab[g].val) {
+			a2 = g;
+			continue;
+		}
+		if(v > hintab[g].val) {
+			a1 = g+1;
+			continue;
+		}
+		break;
+	}
+
+	if(docode(hintab[g].hint, m->code, 1, 0))
+		return m;
+	print("multiply table failure %ld\n", v);
+	m->code[0] = 0;
+	return 0;
+
+no:
+	/*
+	 * try to search
+	 */
+	hint[0] = 0;
+	for(g=1; g<=6; g++) {
+		if(g >= 6 && v >= 65535)
+			break;
+		mulcp = hint+g;
+		*mulcp = 0;
+		if(gen1(g)) {
+			if(docode(hint, m->code, 1, 0))
+				return m;
+			print("multiply table failure %ld\n", v);
+			break;
+		}
+	}
+
+	/*
+	 * try a recur followed by a shift
+	 */
+	g = 0;
+	while(!(v & 1)) {
+		g++;
+		v >>= 1;
+	}
+	if(g) {
+		m1 = mulcon0(v);
+		if(m1) {
+			strcpy(m->code, m1->code);
+			sprint(strchr(m->code, 0), "%c0", g+'a');
+			return m;
+		}
+	}
+	m->code[0] = 0;
+	return 0;
+}
+
+static int
+docode(char *hp, char *cp, int r0, int r1)
+{
+	int c, i;
+
+	c = *hp++;
+	*cp = c;
+	cp += 2;
+	switch(c) {
+	default:
+		c -= 'a';
+		if(c < 1 || c >= 30)
+			break;
+		for(i=0; i<4; i++) {
+			switch(i) {
+			case 0:
+				if(docode(hp, cp, r0<<c, r1))
+					goto out;
+				break;
+			case 1:
+				if(docode(hp, cp, r1<<c, r1))
+					goto out;
+				break;
+			case 2:
+				if(docode(hp, cp, r0, r0<<c))
+					goto out;
+				break;
+			case 3:
+				if(docode(hp, cp, r0, r1<<c))
+					goto out;
+				break;
+			}
+		}
+		break;
+
+	case '+':
+		for(i=0; i<8; i++) {
+			cp[-1] = i+'0';
+			switch(i) {
+			case 1:
+				if(docode(hp, cp, r0+r1, r1))
+					goto out;
+				break;
+			case 5:
+				if(docode(hp, cp, r0, r0+r1))
+					goto out;
+				break;
+			}
+		}
+		break;
+
+	case '-':
+		for(i=0; i<8; i++) {
+			cp[-1] = i+'0';
+			switch(i) {
+			case 1:
+				if(docode(hp, cp, r0-r1, r1))
+					goto out;
+				break;
+			case 2:
+				if(docode(hp, cp, r1-r0, r1))
+					goto out;
+				break;
+			case 5:
+				if(docode(hp, cp, r0, r0-r1))
+					goto out;
+				break;
+			case 6:
+				if(docode(hp, cp, r0, r1-r0))
+					goto out;
+				break;
+			}
+		}
+		break;
+
+	case 0:
+		if(r0 == mulval)
+			return 1;
+	}
+	return 0;
+
+out:
+	cp[-1] = i+'0';
+	return 1;
+}
+
+static int
+gen1(int len)
+{
+	int i;
+
+	for(shmax=1; shmax<30; shmax++) {
+		valmax = 1<<shmax;
+		if(valmax >= mulval)
+			break;
+	}
+	if(mulval == 1)
+		return 1;
+
+	len--;
+	for(i=1; i<=shmax; i++)
+		if(gen2(len, 1<<i)) {
+			*--mulcp = 'a'+i;
+			return 1;
+		}
+	return 0;
+}
+
+static int
+gen2(int len, long r1)
+{
+	int i;
+
+	if(len <= 0) {
+		if(r1 == mulval)
+			return 1;
+		return 0;
+	}
+
+	len--;
+	if(len == 0)
+		goto calcr0;
+
+	if(gen3(len, r1, r1+1, UR1)) {
+		i = '+';
+		goto out;
+	}
+	if(gen3(len, r1-1, r1, UR0)) {
+		i = '-';
+		goto out;
+	}
+	if(gen3(len, 1, r1+1, UR1)) {
+		i = '+';
+		goto out;
+	}
+	if(gen3(len, 1, r1-1, UR1)) {
+		i = '-';
+		goto out;
+	}
+
+	return 0;
+
+calcr0:
+	if(mulval == r1+1) {
+		i = '+';
+		goto out;
+	}
+	if(mulval == r1-1) {
+		i = '-';
+		goto out;
+	}
+	return 0;
+
+out:
+	*--mulcp = i;
+	return 1;
+}
+
+static int
+gen3(int len, long r0, long r1, int flag)
+{
+	int i, f1, f2;
+	long x;
+
+	if(r0 <= 0 ||
+	   r0 >= r1 ||
+	   r1 > valmax)
+		return 0;
+
+	len--;
+	if(len == 0)
+		goto calcr0;
+
+	if(!(flag & UR1)) {
+		f1 = UR1|SR1;
+		for(i=1; i<=shmax; i++) {
+			x = r0<<i;
+			if(x > valmax)
+				break;
+			if(gen3(len, r0, x, f1)) {
+				i += 'a';
+				goto out;
+			}
+		}
+	}
+
+	if(!(flag & UR0)) {
+		f1 = UR1|SR1;
+		for(i=1; i<=shmax; i++) {
+			x = r1<<i;
+			if(x > valmax)
+				break;
+			if(gen3(len, r1, x, f1)) {
+				i += 'a';
+				goto out;
+			}
+		}
+	}
+
+	if(!(flag & SR1)) {
+		f1 = UR1|SR1|(flag&UR0);
+		for(i=1; i<=shmax; i++) {
+			x = r1<<i;
+			if(x > valmax)
+				break;
+			if(gen3(len, r0, x, f1)) {
+				i += 'a';
+				goto out;
+			}
+		}
+	}
+
+	if(!(flag & SR0)) {
+		f1 = UR0|SR0|(flag&(SR1|UR1));
+
+		f2 = UR1|SR1;
+		if(flag & UR1)
+			f2 |= UR0;
+		if(flag & SR1)
+			f2 |= SR0;
+
+		for(i=1; i<=shmax; i++) {
+			x = r0<<i;
+			if(x > valmax)
+				break;
+			if(x > r1) {
+				if(gen3(len, r1, x, f2)) {
+					i += 'a';
+					goto out;
+				}
+			} else
+				if(gen3(len, x, r1, f1)) {
+					i += 'a';
+					goto out;
+				}
+		}
+	}
+
+	x = r1+r0;
+	if(gen3(len, r0, x, UR1)) {
+		i = '+';
+		goto out;
+	}
+
+	if(gen3(len, r1, x, UR1)) {
+		i = '+';
+		goto out;
+	}
+
+	x = r1-r0;
+	if(gen3(len, x, r1, UR0)) {
+		i = '-';
+		goto out;
+	}
+
+	if(x > r0) {
+		if(gen3(len, r0, x, UR1)) {
+			i = '-';
+			goto out;
+		}
+	} else
+		if(gen3(len, x, r0, UR0)) {
+			i = '-';
+			goto out;
+		}
+
+	return 0;
+
+calcr0:
+	f1 = flag & (UR0|UR1);
+	if(f1 == UR1) {
+		for(i=1; i<=shmax; i++) {
+			x = r1<<i;
+			if(x >= mulval) {
+				if(x == mulval) {
+					i += 'a';
+					goto out;
+				}
+				break;
+			}
+		}
+	}
+
+	if(mulval == r1+r0) {
+		i = '+';
+		goto out;
+	}
+	if(mulval == r1-r0) {
+		i = '-';
+		goto out;
+	}
+
+	return 0;
+
+out:
+	*--mulcp = i;
+	return 1;
+}
+
+/*
+ * hint table has numbers that
+ * the search algorithm fails on.
+ * <1000:
+ *	all numbers
+ * <5000:
+ * 	÷ by 5
+ * <10000:
+ * 	÷ by 50
+ * <65536:
+ * 	÷ by 250
+ */
+Hintab	hintab[] =
+{
+	683,	"b++d+e+",
+	687,	"b+e++e-",
+	691,	"b++d+e+",
+	731,	"b++d+e+",
+	811,	"b++d+i+",
+	821,	"b++e+e+",
+	843,	"b+d++e+",
+	851,	"b+f-+e-",
+	853,	"b++e+e+",
+	877,	"c++++g-",
+	933,	"b+c++g-",
+	981,	"c-+e-d+",
+	1375,	"b+c+b+h-",
+	1675,	"d+b++h+",
+	2425,	"c++f-e+",
+	2675,	"c+d++f-",
+	2750,	"b+d-b+h-",
+	2775,	"c-+g-e-",
+	3125,	"b++e+g+",
+	3275,	"b+c+g+e+",
+	3350,	"c++++i+",
+	3475,	"c-+e-f-",
+	3525,	"c-+d+g-",
+	3625,	"c-+e-j+",
+	3675,	"b+d+d+e+",
+	3725,	"b+d-+h+",
+	3925,	"b+d+f-d-",
+	4275,	"b+g++e+",
+	4325,	"b+h-+d+",
+	4425,	"b+b+g-j-",
+	4525,	"b+d-d+f+",
+	4675,	"c++d-g+",
+	4775,	"b+d+b+g-",
+	4825,	"c+c-+i-",
+	4850,	"c++++i-",
+	4925,	"b++e-g-",
+	4975,	"c+f++e-",
+	5500,	"b+g-c+d+",
+	6700,	"d+b++i+",
+	9700,	"d++++j-",
+	11000,	"b+f-c-h-",
+	11750,	"b+d+g+j-",
+	12500,	"b+c+e-k+",
+	13250,	"b+d+e-f+",
+	13750,	"b+h-c-d+",
+	14250,	"b+g-c+e-",
+	14500,	"c+f+j-d-",
+	14750,	"d-g--f+",
+	16750,	"b+e-d-n+",
+	17750,	"c+h-b+e+",
+	18250,	"d+b+h-d+",
+	18750,	"b+g-++f+",
+	19250,	"b+e+b+h+",
+	19750,	"b++h--f-",
+	20250,	"b+e-l-c+",
+	20750,	"c++bi+e-",
+	21250,	"b+i+l+c+",
+	22000,	"b+e+d-g-",
+	22250,	"b+d-h+k-",
+	22750,	"b+d-e-g+",
+	23250,	"b+c+h+e-",
+	23500,	"b+g-c-g-",
+	23750,	"b+g-b+h-",
+	24250,	"c++g+m-",
+	24750,	"b+e+e+j-",
+	25000,	"b++dh+g+",
+	25250,	"b+e+d-g-",
+	25750,	"b+e+b+j+",
+	26250,	"b+h+c+e+",
+	26500,	"b+h+c+g+",
+	26750,	"b+d+e+g-",
+	27250,	"b+e+e+f+",
+	27500,	"c-i-c-d+",
+	27750,	"b+bd++j+",
+	28250,	"d-d-++i-",
+	28500,	"c+c-h-e-",
+	29000,	"b+g-d-f+",
+	29500,	"c+h+++e-",
+	29750,	"b+g+f-c+",
+	30250,	"b+f-g-c+",
+	33500,	"c-f-d-n+",
+	33750,	"b+d-b+j-",
+	34250,	"c+e+++i+",
+	35250,	"e+b+d+k+",
+	35500,	"c+e+d-g-",
+	35750,	"c+i-++e+",
+	36250,	"b+bh-d+e+",
+	36500,	"c+c-h-e-",
+	36750,	"d+e--i+",
+	37250,	"b+g+g+b+",
+	37500,	"b+h-b+f+",
+	37750,	"c+be++j-",
+	38500,	"b+e+b+i+",
+	38750,	"d+i-b+d+",
+	39250,	"b+g-l-+d+",
+	39500,	"b+g-c+g-",
+	39750,	"b+bh-c+f-",
+	40250,	"b+bf+d+g-",
+	40500,	"b+g-c+g+",
+	40750,	"c+b+i-e+",
+	41250,	"d++bf+h+",
+	41500,	"b+j+c+d-",
+	41750,	"c+f+b+h-",
+	42500,	"c+h++g+",
+	42750,	"b+g+d-f-",
+	43250,	"b+l-e+d-",
+	43750,	"c+bd+h+f-",
+	44000,	"b+f+g-d-",
+	44250,	"b+d-g--f+",
+	44500,	"c+e+c+h+",
+	44750,	"b+e+d-h-",
+	45250,	"b++g+j-g+",
+	45500,	"c+d+e-g+",
+	45750,	"b+d-h-e-",
+	46250,	"c+bd++j+",
+	46500,	"b+d-c-j-",
+	46750,	"e-e-b+g-",
+	47000,	"b+c+d-j-",
+	47250,	"b+e+e-g-",
+	47500,	"b+g-c-h-",
+	47750,	"b+f-c+h-",
+	48250,	"d--h+n-",
+	48500,	"b+c-g+m-",
+	48750,	"b+e+e-g+",
+	49500,	"c-f+e+j-",
+	49750,	"c+c+g++f-",
+	50000,	"b+e+e+k+",
+	50250,	"b++i++g+",
+	50500,	"c+g+f-i+",
+	50750,	"b+e+d+k-",
+	51500,	"b+i+c-f+",
+	51750,	"b+bd+g-e-",
+	52250,	"b+d+g-j+",
+	52500,	"c+c+f+g+",
+	52750,	"b+c+e+i+",
+	53000,	"b+i+c+g+",
+	53500,	"c+g+g-n+",
+	53750,	"b+j+d-c+",
+	54250,	"b+d-g-j-",
+	54500,	"c-f+e+f+",
+	54750,	"b+f-+c+g+",
+	55000,	"b+g-d-g-",
+	55250,	"b+e+e+g+",
+	55500,	"b+cd++j+",
+	55750,	"b+bh-d-f-",
+	56250,	"c+d-b+j-",
+	56500,	"c+d+c+i+",
+	56750,	"b+e+d++h-",
+	57000,	"b+d+g-f+",
+	57250,	"b+f-m+d-",
+	57750,	"b+i+c+e-",
+	58000,	"b+e+d+h+",
+	58250,	"c+b+g+g+",
+	58750,	"d-e-j--e+",
+	59000,	"d-i-+e+",
+	59250,	"e--h-m+",
+	59500,	"c+c-h+f-",
+	59750,	"b+bh-e+i-",
+	60250,	"b+bh-e-e-",
+	60500,	"c+c-g-g-",
+	60750,	"b+e-l-e-",
+	61250,	"b+g-g-c+",
+	61750,	"b+g-c+g+",
+	62250,	"f--+c-i-",
+	62750,	"e+f--+g+",
+	64750,	"b+f+d+p-",
+};
+int	hintabsize	= nelem(hintab);
--- /dev/null
+++ b/sys/src/cmd/jc/peep.c
@@ -1,0 +1,719 @@
+#include "gc.h"
+
+void
+peep(void)
+{
+	Reg *r, *r1, *r2;
+	Prog *p, *p1;
+	int t;
+/*
+ * complete R structure
+ */
+	t = 0;
+	for(r=firstr; r!=R; r=r1) {
+		r1 = r->link;
+		if(r1 == R)
+			break;
+		p = r->prog->link;
+		while(p != r1->prog)
+		switch(p->as) {
+		default:
+			r2 = rega();
+			r->link = r2;
+			r2->link = r1;
+
+			r2->prog = p;
+			r2->p1 = r;
+			r->s1 = r2;
+			r2->s1 = r1;
+			r1->p1 = r2;
+
+			r = r2;
+			t++;
+
+		case ADATA:
+		case AGLOBL:
+		case ANAME:
+		case ASIGNAME:
+			p = p->link;
+		}
+	}
+
+	/*
+	 * look for MOVB x,R; MOVB R,R	=> MOVB x,R
+	 * look for MOVB x,R; MOVB R,S	=> MOVB x,R; MOVW R,S
+	 */
+	for(r=firstr; r!=R; r=r->link) {
+		p = r->prog;
+		if(debug['P']) print("PEEP1: %P\n", p);
+		switch(p->as) {
+		default:
+			continue;
+		case AMOVW:
+		case AMOVWU:
+			if(thechar == 'i')
+				continue;
+		case AMOVH:
+		case AMOVHU:
+		case AMOVB:
+		case AMOVBU:
+			if(p->to.type != D_REG)
+				continue;
+			break;
+		}
+		r1 = r->link;
+		if(r1 == R)
+			continue;
+		p1 = r1->prog;
+		if(p1->as != p->as)
+			continue;
+		if(p1->from.type != D_REG || p1->from.reg != p->to.reg)
+			continue;
+		if(p1->to.type != D_REG)
+			continue;
+		if(p1->to.reg == p->to.reg)
+			excise(r1);
+		else
+			p1->as = thechar == 'i' ? AMOVW : AMOV;
+	}
+
+loop1:
+	t = 0;
+	for(r=firstr; r!=R; r=r->link) {
+		p = r->prog;
+		if(debug['P']) print("PEEP2: %P\n", p);
+		if((thechar == 'i' && (p->as == AMOVW || p->as == AMOVWU)) ||
+			p->as == AMOV || p->as == AMOVF || p->as == AMOVD)
+		if(regtyp(&p->to)) {
+			if(regtyp(&p->from))
+			if(p->from.type == p->to.type) {
+				if(copyprop(r)) {
+					excise(r);
+					t++;
+				} else
+				if(subprop(r) && copyprop(r)) {
+					excise(r);
+					t++;
+				}
+			}
+			if(regzer(&p->from))
+			if(p->to.type == D_REG) {
+				p->from.type = D_REG;
+				p->from.reg = 0;
+				if(copyprop(r)) {
+					excise(r);
+					t++;
+				} else
+				if(subprop(r) && copyprop(r)) {
+					excise(r);
+					t++;
+				}
+			}
+		}
+	}
+	if(t)
+		goto loop1;
+}
+
+void
+excise(Reg *r)
+{
+	Prog *p;
+
+	p = r->prog;
+	p->as = ANOP;
+	p->from = zprog.from;
+	p->to = zprog.to;
+	p->reg = zprog.reg; /**/
+}
+
+Reg*
+uniqp(Reg *r)
+{
+	Reg *r1;
+
+	r1 = r->p1;
+	if(r1 == R) {
+		r1 = r->p2;
+		if(r1 == R || r1->p2link != R)
+			return R;
+	} else
+		if(r->p2 != R)
+			return R;
+	return r1;
+}
+
+Reg*
+uniqs(Reg *r)
+{
+	Reg *r1;
+
+	r1 = r->s1;
+	if(r1 == R) {
+		r1 = r->s2;
+		if(r1 == R)
+			return R;
+	} else
+		if(r->s2 != R)
+			return R;
+	return r1;
+}
+
+int
+regzer(Adr *a)
+{
+
+	if(a->type == D_CONST)
+		if(a->sym == S)
+			if(a->offset == 0)
+				return 1;
+	if(a->type == D_REG)
+		if(a->reg == 0)
+			return 1;
+	return 0;
+}
+
+int
+regtyp(Adr *a)
+{
+
+	if(a->type == D_REG) {
+		if(a->reg != 0)
+			return 1;
+		return 0;
+	}
+	if(a->type == D_FREG)
+		return 1;
+	return 0;
+}
+
+/*
+ * the idea is to substitute
+ * one register for another
+ * from one MOV to another
+ *	MOV	a, R0
+ *	ADD	b, R0	/ no use of R1
+ *	MOV	R0, R1
+ * would be converted to
+ *	MOV	a, R1
+ *	ADD	b, R1
+ *	MOV	R1, R0
+ * hopefully, then the former or latter MOV
+ * will be eliminated by copy propagation.
+ */
+int
+subprop(Reg *r0)
+{
+	Prog *p;
+	Adr *v1, *v2;
+	Reg *r;
+	int t;
+
+	p = r0->prog;
+	v1 = &p->from;
+	if(!regtyp(v1))
+		return 0;
+	v2 = &p->to;
+	if(!regtyp(v2))
+		return 0;
+	for(r=uniqp(r0); r!=R; r=uniqp(r)) {
+		if(uniqs(r) == R)
+			break;
+		p = r->prog;
+		switch(p->as) {
+		case AJAL:
+			return 0;
+
+		case ASLT:
+		case ASLTU:
+		case ASGT:
+		case ASGTU:
+
+		case AADD:  case AADDW:
+		case ASUB:  case ASUBW:
+		case ASLL:  case ASLLW:
+		case ASRL:  case ASRLW:
+		case ASRA:  case ASRAW:
+		case AOR:
+		case AAND:
+		case AXOR:
+		case AMUL:  case AMULW:
+		case ADIV:  case ADIVW:
+		case ADIVU: case ADIVUW:
+		case AREM:	case AREMW:
+		case AREMU:	case AREMUW:
+
+		case AADDD:
+		case AADDF:
+		case ASUBD:
+		case ASUBF:
+		case AMULD:
+		case AMULF:
+		case ADIVD:
+		case ADIVF:
+			if(p->to.type == v1->type)
+			if(p->to.reg == v1->reg) {
+				if(p->reg == NREG)
+					p->reg = p->to.reg;
+				goto gotit;
+			}
+			break;
+
+		case AMOVF:
+		case AMOVD:
+		case AMOVW: case AMOVWU: case AMOV:
+			if(p->to.type == v1->type)
+			if(p->to.reg == v1->reg)
+				goto gotit;
+			break;
+		}
+		if(copyau(&p->from, v2) ||
+		   copyau1(p, v2) ||
+		   copyau(&p->to, v2))
+			break;
+		if(copysub(&p->from, v1, v2, 0) ||
+		   copysub1(p, v1, v2, 0) ||
+		   copysub(&p->to, v1, v2, 0))
+			break;
+	}
+	return 0;
+
+gotit:
+	copysub(&p->to, v1, v2, 1);
+	if(debug['P']) {
+		print("gotit: %D->%D\n%P", v1, v2, r->prog);
+		if(p->from.type == v2->type)
+			print(" excise");
+		print("\n");
+	}
+	for(r=uniqs(r); r!=r0; r=uniqs(r)) {
+		p = r->prog;
+		copysub(&p->from, v1, v2, 1);
+		copysub1(p, v1, v2, 1);
+		copysub(&p->to, v1, v2, 1);
+		if(debug['P'])
+			print("%P\n", r->prog);
+	}
+	t = v1->reg;
+	v1->reg = v2->reg;
+	v2->reg = t;
+	if(debug['P'])
+		print("%P last\n", r->prog);
+	return 1;
+}
+
+/*
+ * The idea is to remove redundant copies.
+ *	v1->v2	F=0
+ *	(use v2	s/v2/v1/)*
+ *	set v1	F=1
+ *	use v2	return fail
+ *	-----------------
+ *	v1->v2	F=0
+ *	(use v2	s/v2/v1/)*
+ *	set v1	F=1
+ *	set v2	return success
+ */
+int
+copyprop(Reg *r0)
+{
+	Prog *p;
+	Adr *v1, *v2;
+	Reg *r;
+
+	p = r0->prog;
+	v1 = &p->from;
+	v2 = &p->to;
+	if(copyas(v1, v2))
+		return 1;
+	for(r=firstr; r!=R; r=r->link)
+		r->active = 0;
+	return copy1(v1, v2, r0->s1, 0);
+}
+
+int
+copy1(Adr *v1, Adr *v2, Reg *r, int f)
+{
+	int t;
+	Prog *p;
+
+	if(r->active) {
+		if(debug['P'])
+			print("act set; return 1\n");
+		return 1;
+	}
+	r->active = 1;
+	if(debug['P'])
+		print("copy %D->%D f=%d\n", v1, v2, f);
+	for(; r != R; r = r->s1) {
+		p = r->prog;
+		if(debug['P'])
+			print("%P", p);
+		if(!f && uniqp(r) == R) {
+			f = 1;
+			if(debug['P'])
+				print("; merge; f=%d", f);
+		}
+		t = copyu(p, v2, A);
+		switch(t) {
+		case 2:	/* rar, cant split */
+			if(debug['P'])
+				print("; %Drar; return 0\n", v2);
+			return 0;
+
+		case 3:	/* set */
+			if(debug['P'])
+				print("; %Dset; return 1\n", v2);
+			return 1;
+
+		case 1:	/* used, substitute */
+		case 4:	/* use and set */
+			if(f) {
+				if(!debug['P'])
+					return 0;
+				if(t == 4)
+					print("; %Dused+set and f=%d; return 0\n", v2, f);
+				else
+					print("; %Dused and f=%d; return 0\n", v2, f);
+				return 0;
+			}
+			if(copyu(p, v2, v1)) {
+				if(debug['P'])
+					print("; sub fail; return 0\n");
+				return 0;
+			}
+			if(debug['P'])
+				print("; sub%D/%D", v2, v1);
+			if(t == 4) {
+				if(debug['P'])
+					print("; %Dused+set; return 1\n", v2);
+				return 1;
+			}
+			break;
+		}
+		if(!f) {
+			t = copyu(p, v1, A);
+			if(!f && (t == 2 || t == 3 || t == 4)) {
+				f = 1;
+				if(debug['P'])
+					print("; %Dset and !f; f=%d", v1, f);
+			}
+		}
+		if(debug['P'])
+			print("\n");
+		if(r->s2)
+			if(!copy1(v1, v2, r->s2, f))
+				return 0;
+	}
+	return 1;
+}
+
+/*
+ * return
+ * 1 if v only used (and substitute),
+ * 2 if read-alter-rewrite
+ * 3 if set
+ * 4 if set and used
+ * 0 otherwise (not touched)
+ */
+int
+copyu(Prog *p, Adr *v, Adr *s)
+{
+
+	switch(p->as) {
+
+	default:
+		if(debug['P'])
+			print("unknown op %A\n", p->as);
+		return 2;
+
+
+	case ANOP:	/* read, write */
+	case AMOVW:
+	case AMOVWU:
+	case AMOV:
+	case AMOVF:
+	case AMOVD:
+	case AMOVH:
+	case AMOVHU:
+	case AMOVB:
+	case AMOVBU:
+	case AMOVDW:
+	case AMOVWD:
+	case AMOVUD:
+	case AMOVFW:
+	case AMOVWF:
+	case AMOVUF:
+	case AMOVFD:
+	case AMOVDF:
+		if(s != A) {
+			if(copysub(&p->from, v, s, 1))
+				return 1;
+			if(!copyas(&p->to, v))
+				if(copysub(&p->to, v, s, 1))
+					return 1;
+			return 0;
+		}
+		if(copyas(&p->to, v)) {
+			if(copyau(&p->from, v))
+				return 4;
+			return 3;
+		}
+		if(copyau(&p->from, v))
+			return 1;
+		if(copyau(&p->to, v))
+			return 1;
+		return 0;
+
+	case ASLT:	/* read, read, write */
+	case ASLTU:
+	case ASGT:
+	case ASGTU:
+	case ACMPEQD:
+	case ACMPEQF:
+	case ACMPLED:
+	case ACMPLEF:
+	case ACMPLTD:
+	case ACMPLTF:
+
+	case AADD:  case AADDW:
+	case ASUB:  case ASUBW:
+	case ASLL:  case ASLLW:
+	case ASRL:  case ASRLW:
+	case ASRA:  case ASRAW:
+	case AOR:
+	case AAND:
+	case AXOR:
+	case AMUL:  case AMULW:
+	case ADIV:  case ADIVW:
+	case ADIVU: case ADIVUW:
+	case AREM:	case AREMW:
+	case AREMU:	case AREMUW:
+
+	case AADDF:
+	case AADDD:
+	case ASUBF:
+	case ASUBD:
+	case AMULF:
+	case AMULD:
+	case ADIVF:
+	case ADIVD:
+		if(s != A) {
+			if(copysub(&p->from, v, s, 1))
+				return 1;
+			if(copysub1(p, v, s, 1))
+				return 1;
+			if(!copyas(&p->to, v))
+				if(copysub(&p->to, v, s, 1))
+					return 1;
+			return 0;
+		}
+		if(copyas(&p->to, v)) {
+			if(p->reg == NREG)
+				p->reg = p->to.reg;
+			if(copyau(&p->from, v))
+				return 4;
+			if(copyau1(p, v))
+				return 4;
+			return 3;
+		}
+		if(copyau(&p->from, v))
+			return 1;
+		if(copyau1(p, v))
+			return 1;
+		if(copyau(&p->to, v))
+			return 1;
+		return 0;
+
+	case ABEQ:	/* read, read */
+	case ABGE:
+	case ABGEU:
+	case ABLT:
+	case ABLTU:
+	case ABNE:
+	case ABGT:
+	case ABGTU:
+	case ABLE:
+	case ABLEU:
+
+		if(s != A) {
+			if(copysub(&p->from, v, s, 1))
+				return 1;
+			return copysub1(p, v, s, 1);
+		}
+		if(copyau(&p->from, v))
+			return 1;
+		if(copyau1(p, v))
+			return 1;
+		return 0;
+
+	case AJMP:	/* funny */
+		if(s != A) {
+			if(copysub(&p->to, v, s, 1))
+				return 1;
+			return 0;
+		}
+		if(copyau(&p->to, v))
+			return 1;
+		return 0;
+
+	case ARET:	/* funny */
+		if(v->type == D_REG)
+		if(v->reg == REGRET)
+			return 2;
+		if(v->type == D_FREG)
+		if(v->reg == FREGRET)
+			return 2;
+
+	case AJAL:	/* funny */
+		if(v->type == D_REG) {
+			if(v->reg <= REGEXT && v->reg > exregoffset)
+				return 2;
+			if(REGARG && v->reg == REGARG)
+				return 2;
+		}
+		if(v->type == D_FREG)
+			if(v->reg <= FREGEXT && v->reg > exfregoffset)
+				return 2;
+
+		if(s != A) {
+			if(copysub(&p->to, v, s, 1))
+				return 1;
+			return 0;
+		}
+		if(copyau(&p->to, v))
+			return 4;
+		return 3;
+
+	case ATEXT:	/* funny */
+		if(v->type == D_REG)
+			if(v->reg == REGARG)
+				return 3;
+		return 0;
+	}
+}
+
+int
+a2type(Prog *p)
+{
+
+	switch(p->as) {
+	case ABEQ:
+	case ABGE:
+	case ABGEU:
+	case ABLT:
+	case ABLTU:
+	case ABNE:
+	case ABGT:
+	case ABGTU:
+	case ABLE:
+	case ABLEU:
+
+	case ASLT:
+	case ASLTU:
+	case ASGT:
+	case ASGTU:
+
+	case AADD:  case AADDW:
+	case ASUB:  case ASUBW:
+	case ASLL:  case ASLLW:
+	case ASRL:  case ASRLW:
+	case ASRA:  case ASRAW:
+	case AOR:
+	case AAND:
+	case AXOR:
+	case AMUL:  case AMULW:
+	case ADIV:  case ADIVW:
+	case ADIVU: case ADIVUW:
+	case AREM:	case AREMW:
+	case AREMU:	case AREMUW:
+		return D_REG;
+
+	case ACMPEQD:
+	case ACMPEQF:
+	case ACMPLED:
+	case ACMPLEF:
+	case ACMPLTD:
+	case ACMPLTF:
+
+	case AADDF:
+	case AADDD:
+	case ASUBF:
+	case ASUBD:
+	case AMULF:
+	case AMULD:
+	case ADIVF:
+	case ADIVD:
+		return D_FREG;
+	}
+	return D_NONE;
+}
+
+/*
+ * direct reference,
+ * could be set/use depending on
+ * semantics
+ */
+int
+copyas(Adr *a, Adr *v)
+{
+
+	if(regtyp(v))
+		if(a->type == v->type)
+		if(a->reg == v->reg)
+			return 1;
+	return 0;
+}
+
+/*
+ * either direct or indirect
+ */
+int
+copyau(Adr *a, Adr *v)
+{
+
+	if(copyas(a, v))
+		return 1;
+	if(v->type == D_REG)
+		if(a->type == D_OREG)
+			if(v->reg == a->reg)
+				return 1;
+	return 0;
+}
+
+int
+copyau1(Prog *p, Adr *v)
+{
+
+	if(regtyp(v))
+		if(p->from.type == v->type || p->to.type == v->type)
+		if(p->reg == v->reg) {
+			if(a2type(p) == v->type)
+				return 1;
+		}
+	return 0;
+}
+
+/*
+ * substitute s for v in a
+ * return failure to substitute
+ */
+int
+copysub(Adr *a, Adr *v, Adr *s, int f)
+{
+
+	if(f)
+	if(copyau(a, v))
+		a->reg = s->reg;
+	return 0;
+}
+
+int
+copysub1(Prog *p1, Adr *v, Adr *s, int f)
+{
+
+	if(f)
+	if(copyau1(p1, v))
+		p1->reg = s->reg;
+	return 0;
+}
--- /dev/null
+++ b/sys/src/cmd/jc/reg.c
@@ -1,0 +1,1181 @@
+#include "gc.h"
+
+void	addsplits(void);
+
+Reg*
+rega(void)
+{
+	Reg *r;
+
+	r = freer;
+	if(r == R) {
+		r = alloc(sizeof(*r));
+	} else
+		freer = r->link;
+
+	*r = zreg;
+	return r;
+}
+
+int
+rcmp(void *a1, void *a2)
+{
+	Rgn *p1, *p2;
+	int c1, c2;
+
+	p1 = (Rgn*)a1;
+	p2 = (Rgn*)a2;
+	c1 = p2->cost;
+	c2 = p1->cost;
+	if(c1 -= c2)
+		return c1;
+	return p2->varno - p1->varno;
+}
+
+void
+regopt(Prog *p)
+{
+	Reg *r, *r1, *r2;
+	Prog *p1;
+	int i, z;
+	long initpc, val, npc;
+	ulong vreg;
+	Bits bit;
+	struct
+	{
+		long	m;
+		long	c;
+		Reg*	p;
+	} log5[6], *lp;
+
+	firstr = R;
+	lastr = R;
+	nvar = 0;
+	regbits = 0;
+	for(z=0; z<BITS; z++) {
+		externs.b[z] = 0;
+		params.b[z] = 0;
+		consts.b[z] = 0;
+		addrs.b[z] = 0;
+	}
+
+	/*
+	 * pass 1
+	 * build aux data structure
+	 * allocate pcs
+	 * find use and set of variables
+	 */
+	val = 5L * 5L * 5L * 5L * 5L;
+	lp = log5;
+	for(i=0; i<5; i++) {
+		lp->m = val;
+		lp->c = 0;
+		lp->p = R;
+		val /= 5L;
+		lp++;
+	}
+	val = 0;
+	for(; p != P; p = p->link) {
+		switch(p->as) {
+		case ADATA:
+		case AGLOBL:
+		case ANAME:
+		case ASIGNAME:
+			continue;
+		}
+		r = rega();
+		if(firstr == R) {
+			firstr = r;
+			lastr = r;
+		} else {
+			lastr->link = r;
+			r->p1 = lastr;
+			lastr->s1 = r;
+			lastr = r;
+		}
+		r->prog = p;
+		r->pc = val;
+		val++;
+
+		lp = log5;
+		for(i=0; i<5; i++) {
+			lp->c--;
+			if(lp->c <= 0) {
+				lp->c = lp->m;
+				if(lp->p != R)
+					lp->p->log5 = r;
+				lp->p = r;
+				(lp+1)->c = 0;
+				break;
+			}
+			lp++;
+		}
+
+		r1 = r->p1;
+		if(r1 != R)
+		switch(r1->prog->as) {
+		case ARET:
+		case AJMP:
+			r->p1 = R;
+			r1->s1 = R;
+		}
+
+		/*
+		 * left side always read
+		 */
+		bit = mkvar(&p->from, p->as==AMOVW || p->as==AMOV);
+		for(z=0; z<BITS; z++)
+			r->use1.b[z] |= bit.b[z];
+
+		/*
+		 * right side depends on opcode
+		 */
+		bit = mkvar(&p->to, 0);
+		if(bany(&bit))
+		switch(p->as) {
+		default:
+			diag(Z, "reg: unknown asop: %A", p->as);
+			break;
+
+		/*
+		 * right side write
+		 */
+		case ANOP:
+		case AMOVB:
+		case AMOVBU:
+		case AMOVH:
+		case AMOVHU:
+		case AMOVW:
+		case AMOV:
+		case AMOVF:
+		case AMOVD:
+			for(z=0; z<BITS; z++)
+				r->set.b[z] |= bit.b[z];
+			break;
+
+		/*
+		 * funny
+		 */
+		case AJAL:
+			for(z=0; z<BITS; z++)
+				addrs.b[z] |= bit.b[z];
+			break;
+		}
+	}
+	if(firstr == R)
+		return;
+	initpc = pc - val;
+	npc = val;
+
+	/*
+	 * pass 2
+	 * turn branch references to pointers
+	 * build back pointers
+	 */
+	for(r = firstr; r != R; r = r->link) {
+		p = r->prog;
+		if(p->to.type == D_BRANCH) {
+			val = p->to.offset - initpc;
+			r1 = firstr;
+			while(r1 != R) {
+				r2 = r1->log5;
+				if(r2 != R && val >= r2->pc) {
+					r1 = r2;
+					continue;
+				}
+				if(r1->pc == val)
+					break;
+				r1 = r1->link;
+			}
+			if(r1 == R) {
+				nearln = p->lineno;
+				diag(Z, "ref not found\n%P", p);
+				continue;
+			}
+			if(r1 == r) {
+				nearln = p->lineno;
+				diag(Z, "ref to self\n%P", p);
+				continue;
+			}
+			r->s2 = r1;
+			r->p2link = r1->p2;
+			r1->p2 = r;
+		}
+	}
+	if(debug['R']) {
+		p = firstr->prog;
+		print("\n%L %D\n", p->lineno, &p->from);
+	}
+
+	/*
+	 * pass 2.5
+	 * find looping structure
+	 */
+	for(r = firstr; r != R; r = r->link)
+		r->active = 0;
+	change = 0;
+	loopit(firstr, npc);
+
+	/*
+	 * pass 3
+	 * iterate propagating usage
+	 * 	back until flow graph is complete
+	 */
+loop1:
+	change = 0;
+	for(r = firstr; r != R; r = r->link)
+		r->active = 0;
+	for(r = firstr; r != R; r = r->link)
+		if(r->prog->as == ARET)
+			prop(r, zbits, zbits);
+loop11:
+	/* pick up unreachable code */
+	i = 0;
+	for(r = firstr; r != R; r = r1) {
+		r1 = r->link;
+		if(r1 && r1->active && !r->active) {
+			prop(r, zbits, zbits);
+			i = 1;
+		}
+	}
+	if(i)
+		goto loop11;
+	if(change)
+		goto loop1;
+
+
+	/*
+	 * pass 4
+	 * iterate propagating register/variable synchrony
+	 * 	forward until graph is complete
+	 */
+loop2:
+	change = 0;
+	for(r = firstr; r != R; r = r->link)
+		r->active = 0;
+	synch(firstr, zbits);
+	if(change)
+		goto loop2;
+
+	addsplits();
+
+	if(debug['R'] && debug['v']) {
+		print("\nprop structure:\n");
+		for(r = firstr; r != R; r = r->link) {
+			print("%ld:%P", r->loop, r->prog);
+			for(z=0; z<BITS; z++)
+				bit.b[z] = r->set.b[z] |
+					r->refahead.b[z] | r->calahead.b[z] |
+					r->refbehind.b[z] | r->calbehind.b[z] |
+					r->use1.b[z] | r->use2.b[z];
+			if(bany(&bit)) {
+				print("\t");
+				if(bany(&r->use1))
+					print(" u1=%B", r->use1);
+				if(bany(&r->use2))
+					print(" u2=%B", r->use2);
+				if(bany(&r->set))
+					print(" st=%B", r->set);
+				if(bany(&r->refahead))
+					print(" ra=%B", r->refahead);
+				if(bany(&r->calahead))
+					print(" ca=%B", r->calahead);
+				if(bany(&r->refbehind))
+					print(" rb=%B", r->refbehind);
+				if(bany(&r->calbehind))
+					print(" cb=%B", r->calbehind);
+				if(bany(&r->regdiff))
+					print(" rd=%B", r->regdiff);
+			}
+			print("\n");
+		}
+	}
+
+	/*
+	 * pass 5
+	 * isolate regions
+	 * calculate costs (paint1)
+	 */
+	r = firstr;
+	if(r) {
+		for(z=0; z<BITS; z++)
+			bit.b[z] = (r->refahead.b[z] | r->calahead.b[z]) &
+			  ~(externs.b[z] | params.b[z] | addrs.b[z] | consts.b[z]);
+		if(bany(&bit)) {
+			nearln = r->prog->lineno;
+			warn(Z, "used and not set: %B", bit);
+			if(debug['R'] && !debug['w'])
+				print("used and not set: %B\n", bit);
+		}
+	}
+
+	for(r = firstr; r != R; r = r->link)
+		r->act = zbits;
+	rgp = region;
+	nregion = 0;
+	for(r = firstr; r != R; r = r->link) {
+		for(z=0; z<BITS; z++)
+			bit.b[z] = r->set.b[z] &
+			  ~(r->refahead.b[z] | r->calahead.b[z] | addrs.b[z]);
+		if(bany(&bit)) {
+			nearln = r->prog->lineno;
+			warn(Z, "set and not used: %B", bit);
+			if(debug['R'])
+				print("set and not used: %B\n", bit);
+			excise(r);
+		}
+		for(z=0; z<BITS; z++)
+			bit.b[z] = LOAD(r) & ~(r->act.b[z] | addrs.b[z]);
+		while(bany(&bit)) {
+			i = bnum(bit);
+			rgp->enter = r;
+			rgp->varno = i;
+			change = 0;
+			if(debug['R'] && debug['v'])
+				print("\n");
+			paint1(r, i);
+			bit.b[i/32] &= ~(1L<<(i%32));
+			if(change <= 0) {
+				if(debug['R'])
+					print("%L $%d: %B\n",
+						r->prog->lineno, change, blsh(i));
+				continue;
+			}
+			rgp->cost = change;
+			nregion++;
+			if(nregion >= NRGN) {
+				warn(Z, "too many regions");
+				goto brk;
+			}
+			rgp++;
+		}
+	}
+brk:
+	qsort(region, nregion, sizeof(region[0]), rcmp);
+
+	/*
+	 * pass 6
+	 * determine used registers (paint2)
+	 * replace code (paint3)
+	 */
+	rgp = region;
+	for(i=0; i<nregion; i++) {
+		bit = blsh(rgp->varno);
+		vreg = paint2(rgp->enter, rgp->varno);
+		vreg = allreg(vreg, rgp);
+		if(debug['R']) {
+			if(rgp->regno >= NREG)
+				print("%L $%d F%d: %B\n",
+					rgp->enter->prog->lineno,
+					rgp->cost,
+					rgp->regno-NREG,
+					bit);
+			else
+				print("%L $%d R%d: %B\n",
+					rgp->enter->prog->lineno,
+					rgp->cost,
+					rgp->regno,
+					bit);
+		}
+		if(rgp->regno != 0)
+			paint3(rgp->enter, rgp->varno, vreg, rgp->regno);
+		rgp++;
+	}
+	/*
+	 * pass 7
+	 * peep-hole on basic block
+	 */
+	if(!debug['R'] || debug['P'])
+		peep();
+
+	/*
+	 * pass 8
+	 * recalculate pc
+	 */
+	val = initpc;
+	for(r = firstr; r != R; r = r1) {
+		r->pc = val;
+		p = r->prog;
+		p1 = P;
+		r1 = r->link;
+		if(r1 != R)
+			p1 = r1->prog;
+		for(; p != p1; p = p->link) {
+			switch(p->as) {
+			default:
+				val++;
+				break;
+
+			case ANOP:
+			case ADATA:
+			case AGLOBL:
+			case ANAME:
+			case ASIGNAME:
+				break;
+			}
+		}
+	}
+	pc = val;
+
+	/*
+	 * fix up branches
+	 */
+	if(debug['R'])
+		if(bany(&addrs))
+			print("addrs: %B\n", addrs);
+
+	r1 = 0; /* set */
+	for(r = firstr; r != R; r = r->link) {
+		p = r->prog;
+		if(p->to.type == D_BRANCH)
+			p->to.offset = r->s2->pc;
+		r1 = r;
+	}
+
+	/*
+	 * last pass
+	 * fix unsigned stores (needed as type hint in pass 6)
+	 * eliminate nops
+	 * free aux structures
+	 */
+	for(p = firstr->prog; p != P; p = p->link){
+		if(p->to.type == D_OREG){
+			switch(p->as){
+			case AMOVBU:
+				p->as = AMOVB;
+				break;
+			case AMOVHU:
+				p->as = AMOVH;
+				break;
+			}
+		}
+		while(p->link && p->link->as == ANOP)
+			p->link = p->link->link;
+	}
+	if(r1 != R) {
+		r1->link = freer;
+		freer = firstr;
+	}
+}
+
+void
+addsplits(void)
+{
+	Reg *r, *r1;
+	int z, i;
+	Bits bit;
+
+	for(r = firstr; r != R; r = r->link) {
+		if(r->loop > 1)
+			continue;
+		if(r->prog->as == AJAL)
+			continue;
+		for(r1 = r->p2; r1 != R; r1 = r1->p2link) {
+			if(r1->loop <= 1)
+				continue;
+			for(z=0; z<BITS; z++)
+				bit.b[z] = r1->calbehind.b[z] &
+					(r->refahead.b[z] | r->use1.b[z] | r->use2.b[z]) &
+					~(r->calahead.b[z] & addrs.b[z]);
+			while(bany(&bit)) {
+				i = bnum(bit);
+				bit.b[i/32] &= ~(1L << (i%32));
+			}
+		}
+	}
+}
+
+/*
+ * add mov b,rn
+ * just after r
+ */
+void
+addmove(Reg *r, int bn, int rn, int f)
+{
+	Prog *p, *p1;
+	Adr *a;
+	Var *v;
+
+	p1 = alloc(sizeof(*p1));
+	*p1 = zprog;
+	p = r->prog;
+
+	p1->link = p->link;
+	p->link = p1;
+	p1->lineno = p->lineno;
+
+	v = var + bn;
+
+	a = &p1->to;
+	a->sym = v->sym;
+	a->name = v->name;
+	a->offset = v->offset;
+	a->etype = v->etype;
+	a->type = D_OREG;
+	if(a->etype == TARRAY || a->sym == S)
+		a->type = D_CONST;
+
+	p1->as = AMOVW;
+	if(v->etype == TCHAR || v->etype == TUCHAR)
+		p1->as = AMOVB;
+	if(v->etype == TSHORT || v->etype == TUSHORT)
+		p1->as = AMOVH;
+	if(v->etype == TFLOAT)
+		p1->as = AMOVF;
+	if(v->etype == TDOUBLE)
+		p1->as = AMOVD;
+	if(thechar == 'j')
+	if(v->etype == TVLONG || v->etype == TUVLONG || v->etype == TIND)
+		p1->as = AMOV;
+
+	p1->from.type = D_REG;
+	p1->from.reg = rn;
+	if(rn >= NREG) {
+		p1->from.type = D_FREG;
+		p1->from.reg = rn-NREG;
+	}
+	if(!f) {
+		p1->from = *a;
+		*a = zprog.from;
+		a->type = D_REG;
+		a->reg = rn;
+		if(rn >= NREG) {
+			a->type = D_FREG;
+			a->reg = rn-NREG;
+		}
+		if(v->etype == TUCHAR)
+			p1->as = AMOVBU;
+		if(v->etype == TUSHORT)
+			p1->as = AMOVHU;
+	}
+	if(debug['R'])
+		print("%P\t.a%P\n", p, p1);
+}
+
+Bits
+mkvar(Adr *a, int docon)
+{
+	Var *v;
+	int i, t, n, et, z;
+	long o;
+	Bits bit;
+	Sym *s;
+
+	t = a->type;
+	if(t == D_REG && a->reg != NREG)
+		regbits |= RtoB(a->reg);
+	if(t == D_FREG && a->reg != NREG)
+		regbits |= FtoB(a->reg);
+	s = a->sym;
+	o = a->offset;
+	et = a->etype;
+	if(s == S) {
+		if(t != D_CONST || !docon || a->reg != NREG)
+			goto none;
+		et = TLONG;
+	}
+	if(t == D_CONST) {
+		if(s == S && sval(o))
+			goto none;
+	}
+
+	n = a->name;
+	v = var;
+	for(i=0; i<nvar; i++) {
+		if(s == v->sym)
+		if(n == v->name)
+		if(o == v->offset)
+			goto out;
+		v++;
+	}
+	if(s)
+		if(s->name[0] == '.')
+			goto none;
+	if(nvar >= NVAR) {
+		if(debug['w'] > 1 && s)
+			warn(Z, "variable not optimized: %s", s->name);
+		goto none;
+	}
+	i = nvar;
+	nvar++;
+	v = &var[i];
+	v->sym = s;
+	v->offset = o;
+	v->etype = et;
+	v->name = n;
+	if(debug['R'])
+		print("bit=%2d et=%2d %D\n", i, et, a);
+out:
+	bit = blsh(i);
+	if(n == D_EXTERN || n == D_STATIC)
+		for(z=0; z<BITS; z++)
+			externs.b[z] |= bit.b[z];
+	if(n == D_PARAM)
+		for(z=0; z<BITS; z++)
+			params.b[z] |= bit.b[z];
+	if(v->etype != et || !(typechlpfd[et] || 
+	  (thechar == 'j' && typev[et])))	/* funny punning */
+		for(z=0; z<BITS; z++)
+			addrs.b[z] |= bit.b[z];
+	if(t == D_CONST) {
+		if(s == S) {
+			for(z=0; z<BITS; z++)
+				consts.b[z] |= bit.b[z];
+			return bit;
+		}
+		if(et != TARRAY)
+			for(z=0; z<BITS; z++)
+				addrs.b[z] |= bit.b[z];
+		for(z=0; z<BITS; z++)
+			params.b[z] |= bit.b[z];
+		return bit;
+	}
+	if(t == D_OREG)
+		return bit;
+
+none:
+	return zbits;
+}
+
+void
+prop(Reg *r, Bits ref, Bits cal)
+{
+	Reg *r1, *r2;
+	int z;
+
+	for(r1 = r; r1 != R; r1 = r1->p1) {
+		for(z=0; z<BITS; z++) {
+			ref.b[z] |= r1->refahead.b[z];
+			if(ref.b[z] != r1->refahead.b[z]) {
+				r1->refahead.b[z] = ref.b[z];
+				change++;
+			}
+			cal.b[z] |= r1->calahead.b[z];
+			if(cal.b[z] != r1->calahead.b[z]) {
+				r1->calahead.b[z] = cal.b[z];
+				change++;
+			}
+		}
+		switch(r1->prog->as) {
+		case AJAL:
+			for(z=0; z<BITS; z++) {
+				cal.b[z] |= ref.b[z] | externs.b[z];
+				ref.b[z] = 0;
+			}
+			break;
+
+		case ATEXT:
+			for(z=0; z<BITS; z++) {
+				cal.b[z] = 0;
+				ref.b[z] = 0;
+			}
+			break;
+
+		case ARET:
+			for(z=0; z<BITS; z++) {
+				cal.b[z] = externs.b[z];
+				ref.b[z] = 0;
+			}
+		}
+		for(z=0; z<BITS; z++) {
+			ref.b[z] = (ref.b[z] & ~r1->set.b[z]) |
+				r1->use1.b[z] | r1->use2.b[z];
+			cal.b[z] &= ~(r1->set.b[z] | r1->use1.b[z] | r1->use2.b[z]);
+			r1->refbehind.b[z] = ref.b[z];
+			r1->calbehind.b[z] = cal.b[z];
+		}
+		if(r1->active)
+			break;
+		r1->active = 1;
+	}
+	for(; r != r1; r = r->p1)
+		for(r2 = r->p2; r2 != R; r2 = r2->p2link)
+			prop(r2, r->refbehind, r->calbehind);
+}
+
+/*
+ * find looping structure
+ *
+ * 1) find reverse postordering
+ * 2) find approximate dominators,
+ *	the actual dominators if the flow graph is reducible
+ *	otherwise, dominators plus some other non-dominators.
+ *	See Matthew S. Hecht and Jeffrey D. Ullman,
+ *	"Analysis of a Simple Algorithm for Global Data Flow Problems",
+ *	Conf.  Record of ACM Symp. on Principles of Prog. Langs, Boston, Massachusetts,
+ *	Oct. 1-3, 1973, pp.  207-217.
+ * 3) find all nodes with a predecessor dominated by the current node.
+ *	such a node is a loop head.
+ *	recursively, all preds with a greater rpo number are in the loop
+ */
+long
+postorder(Reg *r, Reg **rpo2r, long n)
+{
+	Reg *r1;
+
+	r->rpo = 1;
+	r1 = r->s1;
+	if(r1 && !r1->rpo)
+		n = postorder(r1, rpo2r, n);
+	r1 = r->s2;
+	if(r1 && !r1->rpo)
+		n = postorder(r1, rpo2r, n);
+	rpo2r[n] = r;
+	n++;
+	return n;
+}
+
+long
+rpolca(long *idom, long rpo1, long rpo2)
+{
+	long t;
+
+	if(rpo1 == -1)
+		return rpo2;
+	while(rpo1 != rpo2){
+		if(rpo1 > rpo2){
+			t = rpo2;
+			rpo2 = rpo1;
+			rpo1 = t;
+		}
+		while(rpo1 < rpo2){
+			t = idom[rpo2];
+			if(t >= rpo2)
+				fatal(Z, "bad idom");
+			rpo2 = t;
+		}
+	}
+	return rpo1;
+}
+
+int
+doms(long *idom, long r, long s)
+{
+	while(s > r)
+		s = idom[s];
+	return s == r;
+}
+
+int
+loophead(long *idom, Reg *r)
+{
+	long src;
+
+	src = r->rpo;
+	if(r->p1 != R && doms(idom, src, r->p1->rpo))
+		return 1;
+	for(r = r->p2; r != R; r = r->p2link)
+		if(doms(idom, src, r->rpo))
+			return 1;
+	return 0;
+}
+
+void
+loopmark(Reg **rpo2r, long head, Reg *r)
+{
+	if(r->rpo < head || r->active == head)
+		return;
+	r->active = head;
+	r->loop += LOOP;
+	if(r->p1 != R)
+		loopmark(rpo2r, head, r->p1);
+	for(r = r->p2; r != R; r = r->p2link)
+		loopmark(rpo2r, head, r);
+}
+
+void
+loopit(Reg *r, long nr)
+{
+	Reg *r1;
+	long i, d, me;
+
+	if(nr > maxnr) {
+		rpo2r = alloc(nr * sizeof(Reg*));
+		idom = alloc(nr * sizeof(long));
+		maxnr = nr;
+	}
+
+	d = postorder(r, rpo2r, 0);
+	if(d > nr)
+		fatal(Z, "too many reg nodes");
+	nr = d;
+	for(i = 0; i < nr / 2; i++){
+		r1 = rpo2r[i];
+		rpo2r[i] = rpo2r[nr - 1 - i];
+		rpo2r[nr - 1 - i] = r1;
+	}
+	for(i = 0; i < nr; i++)
+		rpo2r[i]->rpo = i;
+
+	idom[0] = 0;
+	for(i = 0; i < nr; i++){
+		r1 = rpo2r[i];
+		me = r1->rpo;
+		d = -1;
+		if(r1->p1 != R && r1->p1->rpo < me)
+			d = r1->p1->rpo;
+		for(r1 = r1->p2; r1 != nil; r1 = r1->p2link)
+			if(r1->rpo < me)
+				d = rpolca(idom, d, r1->rpo);
+		idom[i] = d;
+	}
+
+	for(i = 0; i < nr; i++){
+		r1 = rpo2r[i];
+		r1->loop++;
+		if(r1->p2 != R && loophead(idom, r1))
+			loopmark(rpo2r, i, r1);
+	}
+}
+
+void
+synch(Reg *r, Bits dif)
+{
+	Reg *r1;
+	int z;
+
+	for(r1 = r; r1 != R; r1 = r1->s1) {
+		for(z=0; z<BITS; z++) {
+			dif.b[z] = (dif.b[z] &
+				~(~r1->refbehind.b[z] & r1->refahead.b[z])) |
+					r1->set.b[z] | r1->regdiff.b[z];
+			if(dif.b[z] != r1->regdiff.b[z]) {
+				r1->regdiff.b[z] = dif.b[z];
+				change++;
+			}
+		}
+		if(r1->active)
+			break;
+		r1->active = 1;
+		for(z=0; z<BITS; z++)
+			dif.b[z] &= ~(~r1->calbehind.b[z] & r1->calahead.b[z]);
+		if(r1->s2 != R)
+			synch(r1->s2, dif);
+	}
+}
+
+ulong
+allreg(ulong b, Rgn *r)
+{
+	Var *v;
+	int i;
+
+	v = var + r->varno;
+	r->regno = 0;
+	switch(v->etype) {
+
+	default:
+		diag(Z, "unknown etype %d/%d", bitno(b), v->etype);
+		break;
+
+	case TCHAR:
+	case TUCHAR:
+	case TSHORT:
+	case TUSHORT:
+	case TINT:
+	case TUINT:
+	case TLONG:
+	case TULONG:
+	case TVLONG:
+	case TUVLONG:
+	case TIND:
+	case TARRAY:
+		i = BtoR(~b);
+		if(i && r->cost >= 0) {
+			r->regno = i;
+			return RtoB(i);
+		}
+		break;
+
+	case TDOUBLE:
+	case TFLOAT:
+		i = BtoF(~b);
+		if(i && r->cost >= 0) {
+			r->regno = i+NREG;
+			return FtoB(i);
+		}
+		break;
+	}
+	return 0;
+}
+
+void
+paint1(Reg *r, int bn)
+{
+	Reg *r1;
+	Prog *p;
+	int z;
+	ulong bb;
+
+	z = bn/32;
+	bb = 1L<<(bn%32);
+	if(r->act.b[z] & bb)
+		return;
+	for(;;) {
+		if(!(r->refbehind.b[z] & bb))
+			break;
+		r1 = r->p1;
+		if(r1 == R)
+			break;
+		if(!(r1->refahead.b[z] & bb))
+			break;
+		if(r1->act.b[z] & bb)
+			break;
+		r = r1;
+	}
+
+	if(LOAD(r) & ~(r->set.b[z] & ~(r->use1.b[z]|r->use2.b[z])) & bb) {
+		change -= CLOAD * r->loop;
+		if(debug['R'] && debug['v'])
+			print("%ld%P\tld %B $%d\n", r->loop,
+				r->prog, blsh(bn), change);
+	}
+	for(;;) {
+		r->act.b[z] |= bb;
+		p = r->prog;
+
+		if(r->use1.b[z] & bb) {
+			change += CREF * r->loop;
+			if(debug['R'] && debug['v'])
+				print("%ld%P\tu1 %B $%d\n", r->loop,
+					p, blsh(bn), change);
+		}
+
+		if((r->use2.b[z]|r->set.b[z]) & bb) {
+			change += CREF * r->loop;
+			if(debug['R'] && debug['v'])
+				print("%ld%P\tu2 %B $%d\n", r->loop,
+					p, blsh(bn), change);
+		}
+
+		if(STORE(r) & r->regdiff.b[z] & bb) {
+			change -= CLOAD * r->loop;
+			if(debug['R'] && debug['v'])
+				print("%ld%P\tst %B $%d\n", r->loop,
+					p, blsh(bn), change);
+		}
+
+		if(r->refbehind.b[z] & bb)
+			for(r1 = r->p2; r1 != R; r1 = r1->p2link)
+				if(r1->refahead.b[z] & bb)
+					paint1(r1, bn);
+
+		if(!(r->refahead.b[z] & bb))
+			break;
+		r1 = r->s2;
+		if(r1 != R)
+			if(r1->refbehind.b[z] & bb)
+				paint1(r1, bn);
+		r = r->s1;
+		if(r == R)
+			break;
+		if(r->act.b[z] & bb)
+			break;
+		if(!(r->refbehind.b[z] & bb))
+			break;
+	}
+}
+
+ulong
+paint2(Reg *r, int bn)
+{
+	Reg *r1;
+	int z;
+	ulong bb, vreg;
+
+	z = bn/32;
+	bb = 1L << (bn%32);
+	vreg = regbits;
+	if(!(r->act.b[z] & bb))
+		return vreg;
+	for(;;) {
+		if(!(r->refbehind.b[z] & bb))
+			break;
+		r1 = r->p1;
+		if(r1 == R)
+			break;
+		if(!(r1->refahead.b[z] & bb))
+			break;
+		if(!(r1->act.b[z] & bb))
+			break;
+		r = r1;
+	}
+	for(;;) {
+		r->act.b[z] &= ~bb;
+
+		vreg |= r->regu;
+
+		if(r->refbehind.b[z] & bb)
+			for(r1 = r->p2; r1 != R; r1 = r1->p2link)
+				if(r1->refahead.b[z] & bb)
+					vreg |= paint2(r1, bn);
+
+		if(!(r->refahead.b[z] & bb))
+			break;
+		r1 = r->s2;
+		if(r1 != R)
+			if(r1->refbehind.b[z] & bb)
+				vreg |= paint2(r1, bn);
+		r = r->s1;
+		if(r == R)
+			break;
+		if(!(r->act.b[z] & bb))
+			break;
+		if(!(r->refbehind.b[z] & bb))
+			break;
+	}
+	return vreg;
+}
+
+void
+paint3(Reg *r, int bn, long rb, int rn)
+{
+	Reg *r1;
+	Prog *p;
+	int z;
+	ulong bb;
+
+	z = bn/32;
+	bb = 1L << (bn%32);
+	if(r->act.b[z] & bb)
+		return;
+	for(;;) {
+		if(!(r->refbehind.b[z] & bb))
+			break;
+		r1 = r->p1;
+		if(r1 == R)
+			break;
+		if(!(r1->refahead.b[z] & bb))
+			break;
+		if(r1->act.b[z] & bb)
+			break;
+		r = r1;
+	}
+
+	if(LOAD(r) & ~(r->set.b[z] & ~(r->use1.b[z]|r->use2.b[z])) & bb)
+		addmove(r, bn, rn, 0);
+	for(;;) {
+		r->act.b[z] |= bb;
+		p = r->prog;
+
+		if(r->use1.b[z] & bb) {
+			if(debug['R'])
+				print("%P", p);
+			addreg(&p->from, rn);
+			switch(p->as){
+			case AMOVB:
+			case AMOVBU:
+			case AMOVH:
+			case AMOVHU:
+			case AMOVW:
+			case AMOVWU:
+				p->as = AMOV;
+			}
+			if(debug['R'])
+				print("\t.c%P\n", p);
+		}
+		if((r->use2.b[z]|r->set.b[z]) & bb) {
+			if(debug['R'])
+				print("%P", p);
+			addreg(&p->to, rn);
+			switch(p->as){
+			case AMOVW:
+			case AMOVWU:
+				p->as = AMOV;
+			}
+			if(debug['R'])
+				print("\t.c%P\n", p);
+		}
+
+		if(STORE(r) & r->regdiff.b[z] & bb)
+			addmove(r, bn, rn, 1);
+		r->regu |= rb;
+
+		if(r->refbehind.b[z] & bb)
+			for(r1 = r->p2; r1 != R; r1 = r1->p2link)
+				if(r1->refahead.b[z] & bb)
+					paint3(r1, bn, rb, rn);
+
+		if(!(r->refahead.b[z] & bb))
+			break;
+		r1 = r->s2;
+		if(r1 != R)
+			if(r1->refbehind.b[z] & bb)
+				paint3(r1, bn, rb, rn);
+		r = r->s1;
+		if(r == R)
+			break;
+		if(r->act.b[z] & bb)
+			break;
+		if(!(r->refbehind.b[z] & bb))
+			break;
+	}
+}
+
+void
+addreg(Adr *a, int rn)
+{
+
+	a->sym = 0;
+	a->name = D_NONE;
+	a->type = D_REG;
+	a->reg = rn;
+	if(rn >= NREG) {
+		a->type = D_FREG;
+		a->reg = rn-NREG;
+	}
+}
+
+/*
+ *	bit	reg
+ *	0	R9
+ *	1	R10
+ *	...	...
+ *	6	R15
+ * or
+ *	22	R31
+ */
+long
+RtoB(int r)
+{
+
+	if(r < REGLOWALLOC || r > maxregalloc)
+		return 0;
+	return 1L << (r-REGLOWALLOC);
+}
+
+int
+BtoR(long b)
+{
+	b &= MASK(maxregalloc+1-REGLOWALLOC);
+	// b &= MASK(7);
+	if(b == 0)
+		return 0;
+	return bitno(b) + REGLOWALLOC;
+}
+
+/*
+ *	bit	reg
+ *	7	F1
+ *	8	F2
+ *	...	...
+ *	31	F25
+ */
+long
+FtoB(int f)
+{
+
+	if(f < 1 || f > 25)
+		return 0;
+	return 1L << (f + 6);
+}
+
+int
+BtoF(long b)
+{
+
+	b &= 0x03ffff80L;	/* bits 7-25 */
+	if(b == 0)
+		return 0;
+	return bitno(b) - 6;
+}
--- /dev/null
+++ b/sys/src/cmd/jc/sgen.c
@@ -1,0 +1,259 @@
+#include "gc.h"
+
+void
+noretval(int n)
+{
+
+	if(n & 1) {
+		gins(ANOP, Z, Z);
+		p->to.type = D_REG;
+		p->to.reg = REGRET;
+	}
+	if(n & 2) {
+		gins(ANOP, Z, Z);
+		p->to.type = D_FREG;
+		p->to.reg = FREGRET;
+	}
+}
+
+/*
+ *	calculate addressability as follows
+ *		CONST ==> 20		$value
+ *		NAME ==> 10		name
+ *		REGISTER ==> 11		register
+ *		INDREG ==> 12		*[(reg)+offset]
+ *		&10 ==> 2		$name
+ *		ADD(2, 20) ==> 2	$name+offset
+ *		ADD(3, 20) ==> 3	$(reg)+offset
+ *		&12 ==> 3		$(reg)+offset
+ *		*11 ==> 11		??
+ *		*2 ==> 10		name
+ *		*3 ==> 12		*(reg)+offset
+ *	calculate complexity (number of registers)
+ */
+void
+xcom(Node *n)
+{
+	Node *l, *r;
+	int t;
+
+	if(n == Z)
+		return;
+	l = n->left;
+	r = n->right;
+	n->addable = 0;
+	n->complex = 0;
+	switch(n->op) {
+	case OCONST:
+		n->addable = 20;
+		return;
+
+	case OREGISTER:
+		n->addable = 11;
+		return;
+
+	case OINDREG:
+		n->addable = 12;
+		return;
+
+	case ONAME:
+		n->addable = 10;
+		return;
+
+	case OADDR:
+		xcom(l);
+		if(l->addable == 10)
+			n->addable = 2;
+		if(l->addable == 12)
+			n->addable = 3;
+		break;
+
+	case OIND:
+		xcom(l);
+		if(l->addable == 11)
+			n->addable = 12;
+		if(l->addable == 3)
+			n->addable = 12;
+		if(l->addable == 2)
+			n->addable = 10;
+		break;
+
+	case OADD:
+		xcom(l);
+		xcom(r);
+		if(l->addable == 20) {
+			if(r->addable == 2)
+				n->addable = 2;
+			if(r->addable == 3)
+				n->addable = 3;
+		}
+		if(r->addable == 20) {
+			if(l->addable == 2)
+				n->addable = 2;
+			if(l->addable == 3)
+				n->addable = 3;
+		}
+		break;
+
+	case OASLMUL:
+	case OASMUL:
+		xcom(l);
+		xcom(r);
+		t = vlog(r);
+		if(t >= 0) {
+			n->op = OASASHL;
+			r->vconst = t;
+			r->type = types[TINT];
+			goto shiftassign;
+		}
+		break;
+
+	case OMUL:
+	case OLMUL:
+		xcom(l);
+		xcom(r);
+		t = vlog(l);
+		if(t >= 0) {
+			n->left = r;
+			n->right = l;
+			l = r;
+			r = n->right;
+		}
+		t = vlog(r);
+		if(t >= 0) {
+			n->op = OASHL;
+			r->vconst = t;
+			r->type = types[TINT];
+			simplifyshift(n);
+		}
+		break;
+
+	case OASLDIV:
+		xcom(l);
+		xcom(r);
+		t = vlog(r);
+		if(t >= 0) {
+			n->op = OASLSHR;
+			r->vconst = t;
+			r->type = types[TINT];
+			goto shiftassign;
+		}
+		break;
+
+	case OLDIV:
+		xcom(l);
+		xcom(r);
+		t = vlog(r);
+		if(t >= 0) {
+			n->op = OLSHR;
+			r->vconst = t;
+			r->type = types[TINT];
+			simplifyshift(n);
+		}
+		break;
+
+	case OASLMOD:
+		xcom(l);
+		xcom(r);
+		t = vlog(r);
+		if(t >= 0) {
+			n->op = OASAND;
+			r->vconst--;
+		}
+		break;
+
+	case OLMOD:
+		xcom(l);
+		xcom(r);
+		t = vlog(r);
+		if(t >= 0) {
+			n->op = OAND;
+			r->vconst--;
+		}
+		break;
+
+	case OLSHR:
+	case OASHL:
+	case OASHR:
+		xcom(l);
+		xcom(r);
+		simplifyshift(n);
+		break;
+
+	case OASLSHR:
+	case OASASHL:
+	case OASASHR:
+		xcom(l);
+		xcom(r);
+	shiftassign:
+		if(typev[l->type->etype] && !machcap(n) && !typev[r->type->etype]){
+			if(r->op == OCONST)
+				r->type = types[TVLONG];
+			else{
+				n->right = r = new1(OCAST, r, Z);
+				r->type = types[TVLONG];
+				xcom(r);
+			}
+		}
+		break;
+
+	default:
+		if(l != Z)
+			xcom(l);
+		if(r != Z)
+			xcom(r);
+		break;
+	}
+	if(n->addable >= 10)
+		return;
+
+	if(l != Z)
+		n->complex = l->complex;
+	if(r != Z) {
+		if(r->complex == n->complex)
+			n->complex = r->complex+1;
+		else
+		if(r->complex > n->complex)
+			n->complex = r->complex;
+	}
+	if(n->complex == 0)
+		n->complex++;
+
+	if(thechar == 'i' && com64(n))
+		return;
+
+	switch(n->op) {
+	case OFUNC:
+		n->complex = FNX;
+		break;
+
+	case OADD:
+	case OXOR:
+	case OAND:
+	case OOR:
+	case OEQ:
+	case ONE:
+		/*
+		 * immediate operators, make const on right
+		 */
+		if(l->op == OCONST) {
+			n->left = r;
+			n->right = l;
+		}
+		break;
+
+	case OLT:
+	case OLE:
+	case OGT:
+	case OGE:
+	case OLO:
+	case OLS:
+	case OHI:
+	case OHS:
+		/*
+		 * comparison operators, make const on right
+		 */
+		break;
+	}
+}
+
--- /dev/null
+++ b/sys/src/cmd/jc/swt.c
@@ -1,0 +1,621 @@
+#include "gc.h"
+
+void
+swit1(C1 *q, int nc, long def, Node *n)
+{
+	Node tn;
+	
+	if(typev[n->type->etype])
+		regalloc(&tn, &vregnode, Z);
+	else
+		regalloc(&tn, &regnode, Z);
+	swit2(q, nc, def, n, &tn);
+	regfree(&tn);
+}
+
+void
+swit2(C1 *q, int nc, long def, Node *n, Node *tn)
+{
+	C1 *r;
+	int i;
+	Prog *sp;
+
+	if(nc < 5) {
+		for(i=0; i<nc; i++) {
+			if(debug['K'])
+				print("case = %.8llux\n", q->val);
+			gmove(nodgconst(q->val, n->type), tn);
+			gopcode(OEQ, tn, n, Z);
+			patch(p, q->label);
+			q++;
+		}
+		gbranch(OGOTO);
+		patch(p, def);
+		return;
+	}
+	i = nc / 2;
+	r = q+i;
+	if(debug['K'])
+		print("case > %.8llux\n", r->val);
+	gmove(nodgconst(r->val, n->type), tn);
+	gopcode(OGT, tn, n, Z);
+	sp = p;
+	gopcode(OEQ, tn, n, Z);
+	patch(p, r->label);
+	swit2(q, i, def, n, tn);
+
+	if(debug['K'])
+		print("case < %.8llux\n", r->val);
+	patch(sp, pc);
+	swit2(r+1, nc-i-1, def, n, tn);
+}
+
+void
+bitload(Node *b, Node *n1, Node *n2, Node *n3, Node *nn)
+{
+	int sh;
+	long v;
+	Node *l;
+
+	/*
+	 * n1 gets adjusted/masked value
+	 * n2 gets address of cell
+	 * n3 gets contents of cell
+	 */
+	l = b->left;
+	if(n2 != Z) {
+		regalloc(n1, l, nn);
+		reglcgen(n2, l, Z);
+		regalloc(n3, l, Z);
+		gopcode(OAS, n2, Z, n3);
+		gopcode(OAS, n3, Z, n1);
+	} else {
+		regalloc(n1, l, nn);
+		cgen(l, n1);
+	}
+	if(b->type->shift == 0 && typeu[b->type->etype]) {
+		v = ~0 + (1L << b->type->nbits);
+		gopcode(OAND, nodconst(v), Z, n1);
+	} else {
+		/* tfield->width*8 makes bitfields work on 64-bit systems */
+		sh = tfield->width*8 - b->type->shift - b->type->nbits;
+		if(sh > 0)
+			gopcode(OASHL, nodconst(sh), Z, n1);
+		sh += b->type->shift;
+		if(sh > 0)
+			if(typeu[b->type->etype])
+				gopcode(OLSHR, nodconst(sh), Z, n1);
+			else
+				gopcode(OASHR, nodconst(sh), Z, n1);
+	}
+}
+
+void
+bitstore(Node *b, Node *n1, Node *n2, Node *n3, Node *nn)
+{
+	long v;
+	Node nod, *l;
+	int sh;
+
+	/*
+	 * n1 has adjusted/masked value
+	 * n2 has address of cell
+	 * n3 has contents of cell
+	 */
+	l = b->left;
+	regalloc(&nod, l, Z);
+	v = ~0 + (1L << b->type->nbits);
+	gopcode(OAND, nodconst(v), Z, n1);
+	gopcode(OAS, n1, Z, &nod);
+	if(nn != Z)
+		gopcode(OAS, n1, Z, nn);
+	sh = b->type->shift;
+	if(sh > 0)
+		gopcode(OASHL, nodconst(sh), Z, &nod);
+	v <<= sh;
+	gopcode(OAND, nodconst(~v), Z, n3);
+	gopcode(OOR, n3, Z, &nod);
+	gopcode(OAS, &nod, Z, n2);
+
+	regfree(&nod);
+	regfree(n1);
+	regfree(n2);
+	regfree(n3);
+}
+
+long
+outstring(char *s, long n)
+{
+	long r;
+
+	if(suppress)
+		return nstring;
+	r = nstring;
+	while(n) {
+		string[mnstring] = *s++;
+		mnstring++;
+		nstring++;
+		if(mnstring >= NSNAME) {
+			gpseudo(ADATA, symstring, nodconst(0L));
+			p->from.offset += nstring - NSNAME;
+			p->reg = NSNAME;
+			p->to.type = D_SCONST;
+			memmove(p->to.sval, string, NSNAME);
+			mnstring = 0;
+		}
+		n--;
+	}
+	return r;
+}
+
+int
+mulcon(Node *n, Node *nn)
+{
+	Node *l, *r, nod1, nod2;
+	Multab *m;
+	long v;
+	int o;
+	char code[sizeof(m->code)+2], *p;
+
+	if(typefd[n->type->etype])
+		return 0;
+	l = n->left;
+	r = n->right;
+	if(l->op == OCONST) {
+		l = r;
+		r = n->left;
+	}
+	if(r->op != OCONST)
+		return 0;
+	v = convvtox(r->vconst, n->type->etype);
+	if(v != r->vconst) {
+		if(debug['M'])
+			print("%L multiply conv: %lld\n", n->lineno, r->vconst);
+		return 0;
+	}
+	m = mulcon0(v);
+	if(!m) {
+		if(debug['M'])
+			print("%L multiply table: %lld\n", n->lineno, r->vconst);
+		return 0;
+	}
+	if(debug['M'] && debug['v'])
+		print("%L multiply: %ld\n", n->lineno, v);
+
+	memmove(code, m->code, sizeof(m->code));
+	code[sizeof(m->code)] = 0;
+
+	p = code;
+	if(p[1] == 'i')
+		p += 2;
+	regalloc(&nod1, n, nn);
+	cgen(l, &nod1);
+	if(v < 0)
+		gopcode(OSUB, &nod1, nodconst(0), &nod1);
+	regalloc(&nod2, n, Z);
+
+loop:
+	switch(*p) {
+	case 0:
+		regfree(&nod2);
+		gopcode(OAS, &nod1, Z, nn);
+		regfree(&nod1);
+		return 1;
+	case '+':
+		o = OADD;
+		goto addsub;
+	case '-':
+		o = OSUB;
+	addsub:	/* number is r,n,l */
+		v = p[1] - '0';
+		r = &nod1;
+		if(v&4)
+			r = &nod2;
+		n = &nod1;
+		if(v&2)
+			n = &nod2;
+		l = &nod1;
+		if(v&1)
+			l = &nod2;
+		gopcode(o, l, n, r);
+		break;
+	default: /* op is shiftcount, number is r,l */
+		v = p[1] - '0';
+		r = &nod1;
+		if(v&2)
+			r = &nod2;
+		l = &nod1;
+		if(v&1)
+			l = &nod2;
+		v = *p - 'a';
+		if(v < 0 || v >= 32) {
+			diag(n, "mulcon unknown op: %c%c", p[0], p[1]);
+			break;
+		}
+		gopcode(OASHL, nodconst(v), l, r);
+		break;
+	}
+	p += 2;
+	goto loop;
+}
+
+void
+sextern(Sym *s, Node *a, long o, long w)
+{
+	long e, lw;
+
+	for(e=0; e<w; e+=NSNAME) {
+		lw = NSNAME;
+		if(w-e < lw)
+			lw = w-e;
+		gpseudo(ADATA, s, nodconst(0));
+		p->from.offset += o+e;
+		p->reg = lw;
+		p->to.type = D_SCONST;
+		memmove(p->to.sval, a->cstring+e, lw);
+	}
+}
+
+void
+gextern(Sym *s, Node *a, long o, long w)
+{
+
+	if(a->op == OCONST && typev[a->type->etype]) {
+		gpseudo(ADATA, s, nod32const(a->vconst));
+		p->from.offset += o;
+		p->reg = 4;
+		gpseudo(ADATA, s, nod32const(a->vconst>>32));
+		p->from.offset += o + 4;
+		p->reg = 4;
+		return;
+	}
+	gpseudo(ADATA, s, a);
+	p->from.offset += o;
+	p->reg = w;
+	if(p->to.type == D_OREG)
+		p->to.type = D_CONST;
+}
+
+void	zname(Biobuf*, Sym*, int);
+char*	zaddr(char*, Adr*, int);
+void	zwrite(Biobuf*, Prog*, int, int);
+void	outhist(Biobuf*);
+
+void
+zwrite(Biobuf *b, Prog *p, int sf, int st)
+{
+	char bf[100], *bp;
+
+	bf[0] = p->as;
+	bf[1] = p->reg;
+	bf[2] = p->lineno;
+	bf[3] = p->lineno>>8;
+	bf[4] = p->lineno>>16;
+	bf[5] = p->lineno>>24;
+	bp = zaddr(bf+6, &p->from, sf);
+	bp = zaddr(bp, &p->to, st);
+	Bwrite(b, bf, bp-bf);
+}
+
+void
+outcode(void)
+{
+	struct { Sym *sym; short type; } h[NSYM];
+	Prog *p;
+	Sym *s;
+	int sf, st, t, sym;
+
+	if(debug['S']) {
+		for(p = firstp; p != P; p = p->link)
+			if(p->as != ADATA && p->as != AGLOBL)
+				pc--;
+		for(p = firstp; p != P; p = p->link) {
+			print("%P\n", p);
+			if(p->as != ADATA && p->as != AGLOBL)
+				pc++;
+		}
+	}
+	outhist(&outbuf);
+	for(sym=0; sym<NSYM; sym++) {
+		h[sym].sym = S;
+		h[sym].type = 0;
+	}
+	sym = 1;
+	for(p = firstp; p != P; p = p->link) {
+	jackpot:
+		sf = 0;
+		s = p->from.sym;
+		while(s != S) {
+			sf = s->sym;
+			if(sf < 0 || sf >= NSYM)
+				sf = 0;
+			t = p->from.name;
+			if(h[sf].type == t)
+			if(h[sf].sym == s)
+				break;
+			s->sym = sym;
+			zname(&outbuf, s, t);
+			h[sym].sym = s;
+			h[sym].type = t;
+			sf = sym;
+			sym++;
+			if(sym >= NSYM)
+				sym = 1;
+			break;
+		}
+		st = 0;
+		s = p->to.sym;
+		while(s != S) {
+			st = s->sym;
+			if(st < 0 || st >= NSYM)
+				st = 0;
+			t = p->to.name;
+			if(h[st].type == t)
+			if(h[st].sym == s)
+				break;
+			s->sym = sym;
+			zname(&outbuf, s, t);
+			h[sym].sym = s;
+			h[sym].type = t;
+			st = sym;
+			sym++;
+			if(sym >= NSYM)
+				sym = 1;
+			if(st == sf)
+				goto jackpot;
+			break;
+		}
+		zwrite(&outbuf, p, sf, st);
+	}
+	firstp = P;
+	lastp = P;
+}
+
+void
+outhist(Biobuf *b)
+{
+	Hist *h;
+	char *p, *q, *op, c;
+	Prog pg;
+	int n;
+
+	pg = zprog;
+	pg.as = AHISTORY;
+	c = pathchar();
+	for(h = hist; h != H; h = h->link) {
+		p = h->name;
+		op = 0;
+		/* on windows skip drive specifier in pathname */
+		if(systemtype(Windows) && p && p[1] == ':'){
+			p += 2;
+			c = *p;
+		}
+		if(p && p[0] != c && h->offset == 0 && pathname){
+			/* on windows skip drive specifier in pathname */
+			if(systemtype(Windows) && pathname[1] == ':') {
+				op = p;
+				p = pathname+2;
+				c = *p;
+			} else if(pathname[0] == c){
+				op = p;
+				p = pathname;
+			}
+		}
+		while(p) {
+			q = utfrune(p, c);
+			if(q) {
+				n = q-p;
+				if(n == 0){
+					n = 1;	/* leading "/" */
+					*p = '/';	/* don't emit "\" on windows */
+				}
+				q++;
+			} else {
+				n = strlen(p);
+				q = 0;
+			}
+			if(n) {
+				Bputc(b, ANAME);
+				Bputc(b, D_FILE);
+				Bputc(b, 1);
+				Bputc(b, '<');
+				Bwrite(b, p, n);
+				Bputc(b, 0);
+			}
+			p = q;
+			if(p == 0 && op) {
+				p = op;
+				op = 0;
+			}
+		}
+		pg.lineno = h->line;
+		pg.to.type = zprog.to.type;
+		pg.to.offset = h->offset;
+		if(h->offset)
+			pg.to.type = D_CONST;
+
+		zwrite(b, &pg, 0, 0);
+	}
+}
+
+void
+zname(Biobuf *b, Sym *s, int t)
+{
+	char *n, bf[7];
+	ulong sig;
+
+	n = s->name;
+	if(debug['T'] && t == D_EXTERN && s->sig != SIGDONE && s->type != types[TENUM] && s != symrathole){
+		sig = sign(s);
+		bf[0] = ASIGNAME;
+		bf[1] = sig;
+		bf[2] = sig>>8;
+		bf[3] = sig>>16;
+		bf[4] = sig>>24;
+		bf[5] = t;
+		bf[6] = s->sym;
+		Bwrite(b, bf, 7);
+		s->sig = SIGDONE;
+	}
+	else{
+		bf[0] = ANAME;
+		bf[1] = t;	/* type */
+		bf[2] = s->sym;	/* sym */
+		Bwrite(b, bf, 3);
+	}
+	Bwrite(b, n, strlen(n)+1);
+}
+
+char*
+zaddr(char *bp, Adr *a, int s)
+{
+	long l;
+	Ieee e;
+
+	bp[0] = a->type;
+	bp[1] = a->reg;
+	bp[2] = s;
+	bp[3] = a->name;
+	bp += 4;
+	switch(a->type) {
+	default:
+		diag(Z, "unknown type %d in zaddr", a->type);
+
+	case D_NONE:
+	case D_REG:
+	case D_FREG:
+	case D_FCREG:
+		break;
+
+	case D_OREG:
+	case D_CONST:
+	case D_BRANCH:
+		l = a->offset;
+		bp[0] = l;
+		bp[1] = l>>8;
+		bp[2] = l>>16;
+		bp[3] = l>>24;
+		bp += 4;
+		break;
+
+	case D_VCONST:
+		l = *(long*)a->sval;
+		bp[0] = l;
+		bp[1] = l>>8;
+		bp[2] = l>>16;
+		bp[3] = l>>24;
+		bp += 4;
+		l = *((long*)a->sval + 1);
+		bp[0] = l;
+		bp[1] = l>>8;
+		bp[2] = l>>16;
+		bp[3] = l>>24;
+		bp += 4;
+		break;
+
+	case D_SCONST:
+		memmove(bp, a->sval, NSNAME);
+		bp += NSNAME;
+		break;
+
+	case D_FCONST:
+		ieeedtod(&e, a->dval);
+		l = e.l;
+		bp[0] = l;
+		bp[1] = l>>8;
+		bp[2] = l>>16;
+		bp[3] = l>>24;
+		bp += 4;
+		l = e.h;
+		bp[0] = l;
+		bp[1] = l>>8;
+		bp[2] = l>>16;
+		bp[3] = l>>24;
+		bp += 4;
+		break;
+	}
+	return bp;
+}
+
+long
+align(long i, Type *t, int op)
+{
+	long o;
+	Type *v;
+	int w;
+	int linksave;
+
+	o = i;
+	w = 1;
+	linksave = 0;
+	switch(op) {
+	default:
+		diag(Z, "unknown align opcode %d", op);
+		break;
+
+	case Asu2:	/* padding at end of a struct */
+		if(o <= SZ_LONG)
+			w = SZ_LONG;
+		else
+			w = SZ_VLONG;
+		if(packflg)
+			w = packflg;
+		break;
+
+	case Ael1:	/* initial align of struct element */
+		for(v=t; v->etype==TARRAY; v=v->link)
+			;
+		w = v->width;
+		if(w <= 0 || w >= SZ_VLONG)
+			w = SZ_VLONG;
+		if(packflg)
+			w = packflg;
+		break;
+
+	case Ael2:	/* width of a struct element */
+		o += t->width;
+		break;
+
+	case Aarg0:	/* initial passbyptr argument in arg list */
+		if(typecmplx[t->etype]) {
+			o = align(o, types[TIND], Aarg1);
+			o = align(o, types[TIND], Aarg2);
+		}
+		break;
+
+	case Aarg1:	/* initial align of parameter */
+		w = t->width;
+		if(w > 0 && w <= SZ_LONG){
+			w = 1;		/* little endian no adjustment */
+			break;
+		}
+		if(w < SZ_VLONG)
+			diag(Z, "compiler bug? type %T width %d\n", t, w);
+		w = SZ_VLONG;
+		linksave = ewidth[TIND];
+		break;
+
+	case Aarg2:	/* width of a parameter */
+		o += t->width;
+		w = SZ_LONG;
+		break;
+
+	case Aaut3:	/* total align of automatic */
+		o = align(o, t, Ael1);
+		o = align(o, t, Ael2);
+		break;
+	}
+	o = round(o + linksave, w) - linksave;
+	if(debug['A'])
+		print("align %s %ld %T = %ld\n", bnames[op], i, t, o);
+	return o;
+}
+
+long
+maxround(long max, long v)
+{
+	v = round(v, ewidth[TIND]);
+	if(v > max)
+		return v;
+	return max;
+}
--- /dev/null
+++ b/sys/src/cmd/jc/txt.c
@@ -1,0 +1,1493 @@
+#include "gc.h"
+
+static long ncast64[];
+
+extern void ccmain(int, char**);
+
+void
+main(int argc, char **argv)
+{
+	char *p;
+	int oargc;
+	char **oargv;
+
+	if ((p = getenv("JREGALLOC")) != nil)
+		maxregalloc = atoi(p);
+	if (maxregalloc < REGALLOC || maxregalloc >= NREG)
+		maxregalloc = REGALLOC;
+	thechar = 'i';
+	p = strrchr(argv[0], '/');
+	if(p == nil)
+		p = argv[0];
+	else
+		p++;
+	if(*p == 'j')
+		thechar = 'j';
+	oargc = argc;
+	oargv = argv;
+	ARGBEGIN {
+	case 'j':
+		thechar = 'j';
+		break;
+	case 'o':
+	case 'D':
+	case 'I':
+		p = ARGF();
+	} ARGEND
+	USED(p);
+
+	if(thechar == 'j'){
+		thestring = "riscv64";
+		ewidth[TIND] = 8;
+	}else{
+		thestring = "riscv";
+		ewidth[TIND] = 4;
+	}
+	ccmain(oargc, oargv);
+}
+
+void
+ginit(void)
+{
+	int i;
+	Type *t;
+
+	exregoffset = REGEXT;
+	exfregoffset = FREGEXT;
+	listinit();
+	nstring = 0;
+	mnstring = 0;
+	nrathole = 0;
+	pc = 0;
+	breakpc = -1;
+	continpc = -1;
+	cases = C;
+	firstp = P;
+	lastp = P;
+	tfield = types[TLONG];
+
+	if(thechar == 'j'){
+		typeword = typechlvp;
+		typeswitch = typechlv;
+		typecmplx = typesu;
+	}
+
+	zprog.link = P;
+	zprog.as = AGOK;
+	zprog.reg = NREG;
+	zprog.from.type = D_NONE;
+	zprog.from.name = D_NONE;
+	zprog.from.reg = NREG;
+	zprog.to = zprog.from;
+
+	regnode.op = OREGISTER;
+	regnode.class = CEXREG;
+	regnode.reg = REGTMP;
+	regnode.complex = 0;
+	regnode.addable = 11;
+	regnode.type = types[TLONG];
+
+	vregnode = regnode;
+	vregnode.type = types[TVLONG];
+
+	constnode.op = OCONST;
+	constnode.class = CXXX;
+	constnode.complex = 0;
+	constnode.addable = 20;
+	constnode.type = types[TLONG];
+
+	vconstnode = constnode;
+	vconstnode.type = types[TVLONG];
+
+	fconstnode.op = OCONST;
+	fconstnode.class = CXXX;
+	fconstnode.complex = 0;
+	fconstnode.addable = 20;
+	fconstnode.type = types[TDOUBLE];
+
+	nodsafe = new(ONAME, Z, Z);
+	nodsafe->sym = slookup(".safe");
+	nodsafe->type = types[TINT];
+	nodsafe->etype = types[TINT]->etype;
+	nodsafe->class = CAUTO;
+	complex(nodsafe);
+
+	t = typ(TARRAY, types[TCHAR]);
+	symrathole = slookup(".rathole");
+	symrathole->class = CGLOBL;
+	symrathole->type = t;
+
+	nodrat = new(ONAME, Z, Z);
+	nodrat->sym = symrathole;
+	nodrat->type = types[TIND];
+	nodrat->etype = TVOID;
+	nodrat->class = CGLOBL;
+	complex(nodrat);
+	nodrat->type = t;
+
+	nodret = new(ONAME, Z, Z);
+	nodret->sym = slookup(".ret");
+	nodret->type = types[TIND];
+	nodret->etype = TIND;
+	nodret->class = CPARAM;
+	nodret = new(OIND, nodret, Z);
+	complex(nodret);
+
+	if(thechar == 'i'){
+		com64init();
+	}else{
+		memmove(ncast, ncast64, NTYPE*sizeof(long));
+	}
+
+	for(i=0; i<nelem(reg); i++) {
+		reg[i] = 0;
+		if(i == REGZERO)
+			reg[i] = 1;
+	}
+}
+
+void
+gclean(void)
+{
+	int i;
+	Sym *s;
+
+	for(i=0; i<NREG; i++)
+		if(i != REGZERO)
+			if(reg[i])
+				diag(Z, "reg %d left allocated", i);
+	for(i=NREG; i<NREG+NREG; i++)
+		if(reg[i])
+			diag(Z, "freg %d left allocated", i-NREG);
+	while(mnstring)
+		outstring("", 1L);
+	symstring->type->width = nstring;
+	symrathole->type->width = nrathole;
+	for(i=0; i<NHASH; i++)
+	for(s = hash[i]; s != S; s = s->link) {
+		if(s->type == T)
+			continue;
+		if(s->type->width == 0)
+			continue;
+		if(s->class != CGLOBL && s->class != CSTATIC)
+			continue;
+		if(s->type == types[TENUM])
+			continue;
+		gpseudo(AGLOBL, s, nodconst(s->type->width));
+	}
+	nextpc();
+	p->as = AEND;
+	outcode();
+}
+
+void
+nextpc(void)
+{
+
+	p = alloc(sizeof(*p));
+	*p = zprog;
+	p->lineno = nearln;
+	pc++;
+	if(firstp == P) {
+		firstp = p;
+		lastp = p;
+		return;
+	}
+	lastp->link = p;
+	lastp = p;
+}
+
+void
+gargs(Node *n, Node *tn1, Node *tn2)
+{
+	long regs;
+	Node fnxargs[20], *fnxp;
+
+	regs = cursafe;
+
+	fnxp = fnxargs;
+	garg1(n, tn1, tn2, 0, &fnxp);	/* compile fns to temps */
+
+	curarg = 0;
+	fnxp = fnxargs;
+	garg1(n, tn1, tn2, 1, &fnxp);	/* compile normal args and temps */
+
+	cursafe = regs;
+}
+
+void
+garg1(Node *n, Node *tn1, Node *tn2, int f, Node **fnxp)
+{
+	Node nod;
+
+	if(n == Z)
+		return;
+	if(n->op == OLIST) {
+		garg1(n->left, tn1, tn2, f, fnxp);
+		garg1(n->right, tn1, tn2, f, fnxp);
+		return;
+	}
+	if(f == 0) {
+		if(n->complex >= FNX) {
+			regsalloc(*fnxp, n);
+			nod = znode;
+			nod.op = OAS;
+			nod.left = *fnxp;
+			nod.right = n;
+			nod.type = n->type;
+			cgen(&nod, Z);
+			(*fnxp)++;
+		}
+		return;
+	}
+	if(typecmplx[n->type->etype]) {
+		regaalloc(tn2, n);
+		if(n->complex >= FNX) {
+			sugen(*fnxp, tn2, n->type->width);
+			(*fnxp)++;
+		} else
+			sugen(n, tn2, n->type->width);
+		return;
+	}
+	if(REGARG && curarg == 0 && typeword[n->type->etype]) {
+		regaalloc1(tn1, n);
+		if(n->complex >= FNX) {
+			cgen(*fnxp, tn1);
+			(*fnxp)++;
+		} else
+			cgen(n, tn1);
+		return;
+	}
+	if(vconst(n) == 0) {
+		regaalloc(tn2, n);
+		gopcode(OAS, n, Z, tn2);
+		return;
+	}
+	regalloc(tn1, n, Z);
+	if(n->complex >= FNX) {
+		cgen(*fnxp, tn1);
+		(*fnxp)++;
+	} else
+		cgen(n, tn1);
+	regaalloc(tn2, n);
+	gopcode(OAS, tn1, Z, tn2);
+	regfree(tn1);
+}
+
+Node*
+nodgconst(vlong v, Type *t)
+{
+	if(!typev[t->etype])
+		return nodconst((long)v);
+	vconstnode.vconst = v;
+	return &vconstnode;
+}
+
+Node*
+nodconst(long v)
+{
+	constnode.vconst = v;
+	return &constnode;
+}
+
+Node*
+nod32const(vlong v)
+{
+	constnode.vconst = v & MASK(32);
+	return &constnode;
+}
+
+Node*
+nodfconst(double d)
+{
+	fconstnode.fconst = d;
+	return &fconstnode;
+}
+
+void
+nodreg(Node *n, Node *nn, int reg)
+{
+	*n = regnode;
+	n->reg = reg;
+	n->type = nn->type;
+	n->lineno = nn->lineno;
+}
+
+void
+regret(Node *n, Node *nn)
+{
+	int r;
+
+	r = REGRET;
+	if(typefd[nn->type->etype])
+		r = FREGRET+NREG;
+	nodreg(n, nn, r);
+	reg[r]++;
+}
+
+int
+tmpreg(void)
+{
+	int i;
+
+	for(i=REGRET+1; i<=maxregalloc; i++)
+		if(reg[i] == 0)
+			return i;
+	diag(Z, "out of fixed registers");
+	return 0;
+}
+
+void
+regalloc(Node *n, Node *tn, Node *o)
+{
+	int i, j;
+
+	switch(tn->type->etype) {
+	case TCHAR:
+	case TUCHAR:
+	case TSHORT:
+	case TUSHORT:
+	case TINT:
+	case TUINT:
+	case TLONG:
+	case TULONG:
+	case TVLONG:
+	case TUVLONG:
+	case TIND:
+		if(o != Z && o->op == OREGISTER) {
+			i = o->reg;
+			if(i > 0 && i < NREG)
+				goto out;
+		}
+		/* reuse lower registers to aid instruction compression */
+		for(i = REGRET+1; i<=maxregalloc; i++)
+			if(reg[i] == 0)
+				goto out0;
+		diag(tn, "out of fixed registers");
+		goto err;
+
+	case TFLOAT:
+	case TDOUBLE:
+		if(o != Z && o->op == OREGISTER) {
+			i = o->reg;
+			if(i >= NREG && i < NREG+NREG)
+				goto out;
+		}
+		for(j=NREG; j<NREG+FREGEXT-2; j++) {
+			if(reg[j] == 0) {
+				i = j;
+				goto out;
+			}
+		}
+		diag(tn, "out of float registers");
+		goto err;
+	}
+	diag(tn, "unknown type in regalloc: %T", tn->type);
+err:
+	nodreg(n, tn, 0);
+	return;
+out0:
+out:
+	reg[i]++;
+	nodreg(n, tn, i);
+}
+
+void
+regialloc(Node *n, Node *tn, Node *o)
+{
+	Node nod;
+
+	nod = *tn;
+	nod.type = types[TIND];
+	regalloc(n, &nod, o);
+}
+
+void
+regfree(Node *n)
+{
+	int i;
+
+	i = 0;
+	if(n->op != OREGISTER && n->op != OINDREG)
+		goto err;
+	i = n->reg;
+	if(i < 0 || i >= nelem(reg))
+		goto err;
+	if(reg[i] <= 0)
+		goto err;
+	reg[i]--;
+	return;
+err:
+	diag(n, "error in regfree: %d", i);
+}
+
+void
+regsalloc(Node *n, Node *nn)
+{
+	cursafe = align(cursafe + stkoff, nn->type, Aaut3) - stkoff;
+	maxargsafe = maxround(maxargsafe, cursafe+curarg);
+	*n = *nodsafe;
+	n->xoffset = -(stkoff + cursafe);
+	n->type = nn->type;
+	n->etype = nn->type->etype;
+	n->lineno = nn->lineno;
+}
+
+void
+regaalloc1(Node *n, Node *nn)
+{
+	nodreg(n, nn, REGARG);
+	reg[REGARG]++;
+	curarg = align(curarg, nn->type, Aarg1);
+	curarg = align(curarg, nn->type, Aarg2);
+	maxargsafe = maxround(maxargsafe, cursafe+curarg);
+}
+
+void
+regaalloc(Node *n, Node *nn)
+{
+	curarg = align(curarg, nn->type, Aarg1);
+	*n = *nn;
+	n->op = OINDREG;
+	n->reg = REGSP;
+	n->xoffset = curarg + ewidth[TIND];
+	n->complex = 0;
+	n->addable = 20;
+	curarg = align(curarg, nn->type, Aarg2);
+	maxargsafe = maxround(maxargsafe, cursafe+curarg);
+}
+
+void
+regind(Node *n, Node *nn)
+{
+
+	if(n->op != OREGISTER) {
+		diag(n, "regind not OREGISTER");
+		return;
+	}
+	n->op = OINDREG;
+	n->type = nn->type;
+}
+
+void
+raddr(Node *n, Prog *p)
+{
+	Adr a;
+
+	naddr(n, &a);
+	if(a.type == D_CONST && a.offset == 0) {
+		a.type = D_REG;
+		a.reg = 0;
+	}
+	if(a.type != D_REG && a.type != D_FREG) {
+		if(n)
+			diag(n, "bad in raddr: %O", n->op);
+		else
+			diag(n, "bad in raddr: <null>");
+		p->reg = NREG;
+	} else
+		p->reg = a.reg;
+}
+
+void
+naddr(Node *n, Adr *a)
+{
+	long v;
+
+	a->type = D_NONE;
+	if(n == Z)
+		return;
+	switch(n->op) {
+	default:
+	bad:
+		diag(n, "bad in naddr: %O", n->op);
+		break;
+
+	case OREGISTER:
+		a->type = D_REG;
+		a->sym = S;
+		a->reg = n->reg;
+		if(a->reg >= NREG) {
+			a->type = D_FREG;
+			a->reg -= NREG;
+		}
+		break;
+
+	case OIND:
+		naddr(n->left, a);
+		if(a->type == D_REG) {
+			a->type = D_OREG;
+			break;
+		}
+		if(a->type == D_CONST) {
+			a->type = D_OREG;
+			break;
+		}
+		goto bad;
+
+	case OINDREG:
+		a->type = D_OREG;
+		a->sym = S;
+		a->offset = n->xoffset;
+		a->reg = n->reg;
+		break;
+
+	case ONAME:
+		a->etype = n->etype;
+		a->type = D_OREG;
+		a->name = D_STATIC;
+		a->sym = n->sym;
+		a->offset = n->xoffset;
+		if(n->class == CSTATIC)
+			break;
+		if(n->class == CEXTERN || n->class == CGLOBL) {
+			a->name = D_EXTERN;
+			break;
+		}
+		if(n->class == CAUTO) {
+			a->name = D_AUTO;
+			break;
+		}
+		if(n->class == CPARAM) {
+			a->name = D_PARAM;
+			break;
+		}
+		goto bad;
+
+	case OCONST:
+		a->sym = S;
+		a->reg = NREG;
+		if(typefd[n->type->etype]) {
+			a->type = D_FCONST;
+			a->dval = n->fconst;
+		} else {
+			v = (long)n->vconst;
+			if(thechar == 'j' && (vlong)v != n->vconst) {
+				a->type = D_VCONST;
+				*(vlong*)a->sval = n->vconst;
+			} else {
+				a->type = D_CONST;
+				a->offset = n->vconst;
+			}
+		}
+		break;
+
+	case OADDR:
+		naddr(n->left, a);
+		if(a->type == D_OREG) {
+			a->type = D_CONST;
+			break;
+		}
+		goto bad;
+
+	case OADD:
+		if(n->left->op == OCONST) {
+			naddr(n->left, a);
+			v = a->offset;
+			naddr(n->right, a);
+		} else {
+			naddr(n->right, a);
+			v = a->offset;
+			naddr(n->left, a);
+		}
+		a->offset += v;
+		break;
+
+	}
+}
+
+void
+fop(int as, int f1, int f2, Node *t)
+{
+	Node nod1, nod2, nod3;
+
+	nodreg(&nod1, t, NREG+f1);
+	nodreg(&nod2, t, NREG+f2);
+	regalloc(&nod3, t, t);
+	gopcode(as, &nod1, &nod2, &nod3);
+	gmove(&nod3, t);
+	regfree(&nod3);
+}
+
+void
+gmove(Node *f, Node *t)
+{
+	int ft, tt, a;
+	Node nod;
+	double d;
+
+	ft = f->type->etype;
+	tt = t->type->etype;
+
+	if(debug['O'])
+		print("gmove: %O[%T],%O[%T]\n",
+			f->op, f->type, t->op, t->type);
+	if(ft == TDOUBLE && f->op == OCONST) {
+		d = f->fconst;
+		if(d == 0) {
+			a = FREGZERO;
+			goto ffreg;
+		}
+		if(d == 0.5) {
+			a = FREGHALF;
+			goto ffreg;
+		}
+		if(d == 1.0) {
+			a = FREGONE;
+			goto ffreg;
+		}
+		if(d == 2.0) {
+			a = FREGTWO;
+			goto ffreg;
+		}
+		if(d == -.5) {
+			fop(OSUB, FREGHALF, FREGZERO, t);
+			return;
+		}
+		if(d == -1.0) {
+			fop(OSUB, FREGONE, FREGZERO, t);
+			return;
+		}
+		if(d == -2.0) {
+			fop(OSUB, FREGTWO, FREGZERO, t);
+			return;
+		}
+		if(d == 1.5) {
+			fop(OADD, FREGONE, FREGHALF, t);
+			return;
+		}
+		if(d == 2.5) {
+			fop(OADD, FREGTWO, FREGHALF, t);
+			return;
+		}
+		if(d == 3.0) {
+			fop(OADD, FREGTWO, FREGONE, t);
+			return;
+		}
+	}
+	if(ft == TFLOAT && f->op == OCONST) {
+		d = f->fconst;
+		if(d == 0) {
+			a = FREGZERO;
+		ffreg:
+			nodreg(&nod, f, NREG+a);
+			gmove(&nod, t);
+			return;
+		}
+	}
+
+	/*
+	 * a load --
+	 * put it into a register then
+	 * worry what to do with it.
+	 */
+	if(f->op == ONAME || f->op == OINDREG || f->op == OIND) {
+		switch(ft) {
+		default:
+			a = AMOV;
+			break;
+		case TFLOAT:
+			a = AMOVF;
+			break;
+		case TDOUBLE:
+			a = AMOVD;
+			break;
+		case TCHAR:
+			a = AMOVB;
+			break;
+		case TUCHAR:
+			a = AMOVBU;
+			break;
+		case TSHORT:
+			a = AMOVH;
+			break;
+		case TUSHORT:
+			a = AMOVHU;
+			break;
+		case TINT:
+		case TLONG:
+			a = AMOVW;
+			break;
+		case TUINT:
+		case TULONG:
+			a = AMOVW;	/* sic */
+			break;
+		case TIND:
+			a = thechar == 'j' ? AMOV : AMOVW;
+			break;
+		}
+		if(typechlp[ft] && typeilp[tt])
+			regalloc(&nod, t, t);
+		else
+			regalloc(&nod, f, t);
+		gins(a, f, &nod);
+		gmove(&nod, t);
+		regfree(&nod);
+		return;
+	}
+
+	/*
+	 * a store --
+	 * put it into a register then
+	 * store it.
+	 */
+	if(t->op == ONAME || t->op == OINDREG || t->op == OIND) {
+		switch(tt) {
+		default:
+			a = AMOVW;
+			break;
+		case TUCHAR:
+			if(!debug['N'] || debug['R'] || debug['P']){
+				a = AMOVBU;
+				break;
+			}
+		case TCHAR:
+			a = AMOVB;
+			break;
+		case TUSHORT:
+			if(!debug['N'] || debug['R'] || debug['P']){
+				a = AMOVHU;
+				break;
+			}
+		case TSHORT:
+			a = AMOVH;
+			break;
+		case TFLOAT:
+			a = AMOVF;
+			break;
+		case TDOUBLE:
+			a = AMOVD;
+			break;
+		case TVLONG:
+		case TUVLONG:
+			a = AMOV;
+			break;
+		case TIND:
+			a = thechar == 'j' ? AMOV : AMOVW;
+			break;
+		}
+		if(!typefd[ft] && vconst(f) == 0) {
+#ifdef notyet
+			nodreg(&nod, f, REGZERO);
+			gins(a, &nod, t);
+#else
+			gins(a, f, t);
+#endif
+			return;
+		}
+		if(ft == tt)
+			regalloc(&nod, t, f);
+		else
+			regalloc(&nod, t, Z);
+		gmove(f, &nod);
+		gins(a, &nod, t);
+		regfree(&nod);
+		return;
+	}
+
+	/*
+	 * type x type cross table
+	 */
+	a = AGOK;
+	switch(ft) {
+	case TDOUBLE:
+	case TFLOAT:
+		switch(tt) {
+		case TDOUBLE:
+			a = AMOVD;
+			if(ft == TFLOAT)
+				a = AMOVFD;
+			break;
+		case TFLOAT:
+			a = AMOVDF;
+			if(ft == TFLOAT)
+				a = AMOVF;
+			break;
+		case TVLONG:
+		case TUVLONG:
+			a = AMOVDV;
+			if(ft == TFLOAT)
+				a = AMOVFV;
+			break;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TIND:
+		case TSHORT:
+		case TUSHORT:
+		case TCHAR:
+		case TUCHAR:
+			a = AMOVDW;
+			if(ft == TFLOAT)
+				a = AMOVFW;
+			break;
+		}
+		break;
+
+	case TVLONG:
+	case TUVLONG:
+	fvlong:
+		switch(tt) {
+		case TDOUBLE:
+			a = ft == TUVLONG ? AMOVUVD : AMOVVD;
+			break;
+		case TFLOAT:
+			a = ft == TUVLONG ? AMOVUVF : AMOVVF;
+			break;
+		case TVLONG:
+		case TUVLONG:
+		case TIND:
+			a = AMOV;
+			break;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TSHORT:
+		case TUSHORT:
+		case TCHAR:
+		case TUCHAR:
+			a = AMOVW;
+			break;
+		}
+		break;
+
+	case TINT:
+	case TLONG:
+		switch(tt) {
+		case TDOUBLE:
+			gins(AMOVWD, f, t);
+			return;
+		case TFLOAT:
+			gins(AMOVWF, f, t);
+			return;
+		case TVLONG:
+		case TUVLONG:
+			a = AMOVW;
+			break;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TIND:
+		case TSHORT:
+		case TUSHORT:
+		case TCHAR:
+		case TUCHAR:
+			a = AMOV;
+			break;
+		}
+		break;
+
+	case TIND:
+		if(thechar == 'j')
+			goto fvlong;
+	/* fall through */
+	case TUINT:
+	case TULONG:
+		switch(tt) {
+		case TDOUBLE:
+			gins(AMOVUD, f, t);
+			return;
+		case TFLOAT:
+			gins(AMOVUF, f, t);
+			return;
+		case TVLONG:
+		case TUVLONG:
+			a = AMOVWU;
+			break;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TIND:
+		case TSHORT:
+		case TUSHORT:
+		case TCHAR:
+		case TUCHAR:
+			if(thechar == 'j' && f->op == OCONST)
+				a = AMOVW;
+			else
+				a = AMOV;
+			break;
+		}
+		break;
+
+	case TSHORT:
+		switch(tt) {
+		case TDOUBLE:
+			regalloc(&nod, f, Z);
+			gins(AMOVH, f, &nod);
+			gins(AMOVWD, &nod, t);
+			regfree(&nod);
+			return;
+		case TFLOAT:
+			regalloc(&nod, f, Z);
+			gins(AMOVH, f, &nod);
+			gins(AMOVWF, &nod, t);
+			regfree(&nod);
+			return;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TIND:
+		case TVLONG:
+		case TUVLONG:
+			a = AMOVH;
+			break;
+		case TSHORT:
+		case TUSHORT:
+		case TCHAR:
+		case TUCHAR:
+			a = AMOV;
+			break;
+		}
+		break;
+	case TUSHORT:
+		switch(tt) {
+		case TDOUBLE:
+			regalloc(&nod, f, Z);
+			gins(AMOVHU, f, &nod);
+			gins(AMOVWD, &nod, t);
+			regfree(&nod);
+			return;
+		case TFLOAT:
+			regalloc(&nod, f, Z);
+			gins(AMOVHU, f, &nod);
+			gins(AMOVWF, &nod, t);
+			regfree(&nod);
+			return;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TIND:
+		case TVLONG:
+		case TUVLONG:
+			a = AMOVHU;
+			break;
+		case TSHORT:
+		case TUSHORT:
+		case TCHAR:
+		case TUCHAR:
+			a = AMOV;
+			break;
+		}
+		break;
+	case TCHAR:
+		switch(tt) {
+		case TDOUBLE:
+			regalloc(&nod, f, Z);
+			gins(AMOVB, f, &nod);
+			gins(AMOVWD, &nod, t);
+			regfree(&nod);
+			return;
+		case TFLOAT:
+			regalloc(&nod, f, Z);
+			gins(AMOVB, f, &nod);
+			gins(AMOVWF, &nod, t);
+			regfree(&nod);
+			return;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TIND:
+		case TVLONG:
+		case TUVLONG:
+		case TSHORT:
+		case TUSHORT:
+			a = AMOVB;
+			break;
+		case TCHAR:
+		case TUCHAR:
+			a = AMOV;
+			break;
+		}
+		break;
+	case TUCHAR:
+		switch(tt) {
+		case TDOUBLE:
+			regalloc(&nod, f, Z);
+			gins(AMOVBU, f, &nod);
+			gins(AMOVWD, &nod, t);
+			regfree(&nod);
+			return;
+		case TFLOAT:
+			regalloc(&nod, f, Z);
+			gins(AMOVBU, f, &nod);
+			gins(AMOVWF, &nod, t);
+			regfree(&nod);
+			return;
+		case TINT:
+		case TUINT:
+		case TLONG:
+		case TULONG:
+		case TIND:
+		case TVLONG:
+		case TUVLONG:
+		case TSHORT:
+		case TUSHORT:
+			a = AMOVBU;
+			break;
+		case TCHAR:
+		case TUCHAR:
+			a = AMOV;
+			break;
+		}
+		break;
+	}
+	if(a == AGOK)
+		diag(Z, "bad opcode in gmove %T -> %T", f->type, t->type);
+	if(a == AMOV || (thechar == 'i' && (a == AMOVW || a == AMOVWU)) || a == AMOVF || a == AMOVD)
+	if(samaddr(f, t))
+		return;
+	gins(a, f, t);
+}
+
+void
+gins(int a, Node *f, Node *t)
+{
+
+	nextpc();
+	p->as = a;
+	if(f != Z)
+		naddr(f, &p->from);
+	if(t != Z)
+		naddr(t, &p->to);
+	if(debug['g'])
+		print("%P\n", p);
+}
+
+void
+gopcode(int o, Node *f1, Node *f2, Node *t)
+{
+	int a, ab, et, tword;
+	Adr ta;
+
+	tword = 0;
+	if(thechar == 'j')
+		if(t != Z && t->type != T)
+			if((et = t->type->etype) != TIND && !typev[et])
+				tword = 1;
+	et = TLONG;
+	if(f1 != Z && f1->type != T)
+		et = f1->type->etype;
+	if(debug['O']) {
+		if(f1 != Z && f1->type != T)
+			print("gop: %O %O[%s],", o, f1->op, tnames[et]);
+		else
+			print("gop: %O Z,", o);
+		if(f2 != Z && f2->type != T)
+			print("%O[%s],", f2->op, tnames[f2->type->etype]);
+		if(t != Z && t->type != T)
+			print("%O[%s]\n", t->op, tnames[t->type->etype]);
+		else
+			print("Z\n");
+	}
+	a = AGOK;
+	switch(o) {
+	case OAS:
+		gmove(f1, t);
+		return;
+
+	case OASADD:
+	case OADD:
+		a = tword ? AADDW : AADD;
+		if(et == TFLOAT)
+			a = AADDF;
+		else
+		if(et == TDOUBLE)
+			a = AADDD;
+		break;
+
+	case OASSUB:
+	case OSUB:
+		a = tword ? ASUBW : ASUB;
+		if(et == TFLOAT)
+			a = ASUBF;
+		else
+		if(et == TDOUBLE)
+			a = ASUBD;
+		break;
+
+	case OASOR:
+	case OOR:
+		a = AOR;
+		break;
+
+	case OASAND:
+	case OAND:
+		a = AAND;
+		break;
+
+	case OASXOR:
+	case OXOR:
+		a = AXOR;
+		break;
+
+	case OASLSHR:
+	case OLSHR:
+		a = tword ? ASRLW : ASRL;
+		break;
+
+	case OASASHR:
+	case OASHR:
+		a = tword ? ASRAW : ASRA;
+		break;
+
+	case OASASHL:
+	case OASHL:
+		a = tword ? ASLLW : ASLL;
+		break;
+
+	case OFUNC:
+		a = AJAL;
+		break;
+
+	case OCOND:
+		a = ASLTU;
+		break;
+
+	case OCOMMA:
+		a = ASLT;
+		break;
+
+	case OASMUL:
+	case OMUL:
+		if(et == TFLOAT) {
+			a = AMULF;
+			break;
+		} else
+		if(et == TDOUBLE) {
+			a = AMULD;
+			break;
+		}
+		a = tword ? AMULW : AMUL;
+		break;
+
+	case OASDIV:
+	case ODIV:
+		if(et == TFLOAT) {
+			a = ADIVF;
+			break;
+		} else
+		if(et == TDOUBLE) {
+			a = ADIVD;
+			break;
+		}
+		a = tword ? ADIVW : ADIV;
+		break;
+
+	case OASMOD:
+	case OMOD:
+		a = tword ? AREMW : AREM;
+		break;
+
+	case OASLMUL:
+	case OLMUL:
+		a = tword ? AMULW : AMUL;
+		break;
+
+	case OASLMOD:
+	case OLMOD:
+		a = tword ? AREMUW : AREMU;
+		break;
+
+	case OASLDIV:
+	case OLDIV:
+		a = tword ? ADIVUW : ADIVU;
+		break;
+
+	case OEQ:
+		if(!typefd[et]) {
+			a = ABEQ;
+			break;
+		}
+		a = et == TFLOAT? ACMPEQF : ACMPEQD;
+		ab = ABNE;
+		goto cmpfloat;
+	case ONE:
+		if(!typefd[et]) {
+			a = ABNE;
+			break;
+		}
+		a = et == TFLOAT? ACMPEQF : ACMPEQD;
+		ab = ABEQ;
+		goto cmpfloat;
+	case OLT:
+		if(!typefd[et]) {
+			a = ABLT;
+			break;
+		}
+		a = et == TFLOAT? ACMPLTF : ACMPLTD;
+		ab = ABNE;
+		goto cmpfloat;
+	case OLE:
+		if(!typefd[et]) {
+			a = ABLE;	/* pseudo op */
+			break;
+		}
+		a = et == TFLOAT? ACMPLEF : ACMPLED;
+		ab = ABNE;
+		goto cmpfloat;
+	case OGE:
+		if(!typefd[et]) {
+			a = ABGE;
+			break;
+		}
+		a = et == TFLOAT? ACMPLTF : ACMPLTD;
+		ab = ABEQ;
+		goto cmpfloat;
+	case OGT:
+		if(!typefd[et]) {
+			a = ABGT;	/* pseudo op */
+			break;
+		}
+		a = et == TFLOAT? ACMPLEF : ACMPLED;
+		ab = ABEQ;
+		goto cmpfloat;
+	case OLO:
+		a = ABLTU;
+		break;
+	case OLS:
+		a = ABLEU;	/* pseudo op */
+		break;
+	case OHS:
+		a = ABGEU;
+		break;
+	case OHI:
+		a = ABGTU;	/* pseudo op */
+		break;
+
+	cmpfloat:
+		nextpc();
+		p->as = a;
+		naddr(f1, &p->from);
+		raddr(f2, p);
+		if(t != Z)
+			naddr(t, &p->to);
+		else {
+			naddr(&regnode, &p->to);
+			p->to.reg = tmpreg();
+		}
+		if(debug['g'])
+			print("%P\n", p);
+		if(t == Z) {
+			nextpc();
+			p->as = ab;
+			naddr(&regnode, &p->from);
+			p->from.reg = tmpreg();
+			if(debug['g'])
+				print("%P\n", p);
+		} else if (ab == ABNE) {
+			nextpc();
+			p->as = AXOR;
+			naddr(nodconst(1), &p->from);
+			raddr(t, p);
+			naddr(t, &p->to);
+			if(debug['g'])
+				print("%P\n", p);
+		}
+		return;
+	}
+	if(a == AGOK)
+		diag(Z, "bad in gopcode %O", o);
+	nextpc();
+	p->as = a;
+	if(f1 != Z)
+		naddr(f1, &p->from);
+	if(f2 != Z) {
+		naddr(f2, &ta);
+		p->reg = ta.reg;
+		if(ta.type == D_CONST && ta.offset == 0)
+			p->reg = REGZERO;
+	}
+	if(t != Z)
+		naddr(t, &p->to);
+	if(debug['g'])
+		print("%P\n", p);
+}
+
+int
+samaddr(Node *f, Node *t)
+{
+
+	if(f->op != t->op)
+		return 0;
+	switch(f->op) {
+
+	case OREGISTER:
+		if(f->reg != t->reg)
+			break;
+		return 1;
+	}
+	return 0;
+}
+
+void
+gbranch(int o)
+{
+	int a;
+
+	a = AGOK;
+	switch(o) {
+	case ORETURN:
+		a = ARET;
+		break;
+	case OGOTO:
+		a = AJMP;
+		break;
+	}
+	nextpc();
+	if(a == AGOK) {
+		diag(Z, "bad in gbranch %O",  o);
+		nextpc();
+	}
+	p->as = a;
+}
+
+void
+patch(Prog *op, long pc)
+{
+
+	op->to.offset = pc;
+	op->to.type = D_BRANCH;
+}
+
+void
+gpseudo(int a, Sym *s, Node *n)
+{
+
+	nextpc();
+	p->as = a;
+	p->from.type = D_OREG;
+	p->from.sym = s;
+	if(a == ATEXT)
+		p->reg = (profileflg ? 0 : NOPROF);
+	p->from.name = D_EXTERN;
+	if(s->class == CSTATIC)
+		p->from.name = D_STATIC;
+	naddr(n, &p->to);
+	if(a == ADATA || a == AGLOBL)
+		pc--;
+}
+
+int
+sconst(Node *n)
+{
+	vlong vv;
+
+	if(n->op == OCONST) {
+		if(!typefd[n->type->etype]) {
+			vv = n->vconst;
+			if(vv >= (vlong)(-2048) && vv < (vlong)2048)
+				return 1;
+		}
+	}
+	return 0;
+}
+
+int
+sval(long v)
+{
+	if(v >= -32766L && v < 32766L)
+		return 1;
+	return 0;
+}
+
+long
+exreg(Type *t)
+{
+	long o;
+
+	if(typechlp[t->etype]) {
+		if(exregoffset <= REGTMP)
+			return 0;
+		o = exregoffset;
+		exregoffset--;
+		return o;
+	}
+	if(typefd[t->etype]) {
+		if(exfregoffset <= 16)
+			return 0;
+		o = exfregoffset + NREG;
+		exfregoffset--;
+		return o;
+	}
+	return 0;
+}
+
+schar	ewidth[NTYPE] =
+{
+	-1,		/* [TXXX] */
+	SZ_CHAR,	/* [TCHAR] */
+	SZ_CHAR,	/* [TUCHAR] */
+	SZ_SHORT,	/* [TSHORT] */
+	SZ_SHORT,	/* [TUSHORT] */
+	SZ_INT,		/* [TINT] */
+	SZ_INT,		/* [TUINT] */
+	SZ_LONG,	/* [TLONG] */
+	SZ_LONG,	/* [TULONG] */
+	SZ_VLONG,	/* [TVLONG] */
+	SZ_VLONG,	/* [TUVLONG] */
+	SZ_FLOAT,	/* [TFLOAT] */
+	SZ_DOUBLE,	/* [TDOUBLE] */
+	0,		/* [TIND] - set to 4 or 8 in main */
+	0,		/* [TFUNC] */
+	-1,		/* [TARRAY] */
+	0,		/* [TVOID] */
+	-1,		/* [TSTRUCT] */
+	-1,		/* [TUNION] */
+	SZ_INT,		/* [TENUM] */
+};
+
+long	ncast[NTYPE] =
+{
+	0,				/* [TXXX] */
+	BCHAR|BUCHAR,			/* [TCHAR] */
+	BCHAR|BUCHAR,			/* [TUCHAR] */
+	BSHORT|BUSHORT,			/* [TSHORT] */
+	BSHORT|BUSHORT,			/* [TUSHORT] */
+	BINT|BUINT|BLONG|BULONG|BIND,	/* [TINT] */
+	BINT|BUINT|BLONG|BULONG|BIND,	/* [TUINT] */
+	BINT|BUINT|BLONG|BULONG|BIND,	/* [TLONG] */
+	BINT|BUINT|BLONG|BULONG|BIND,	/* [TULONG] */
+	BVLONG|BUVLONG,			/* [TVLONG] */
+	BVLONG|BUVLONG,			/* [TUVLONG] */
+	BFLOAT,				/* [TFLOAT] */
+	BDOUBLE,			/* [TDOUBLE] */
+	BLONG|BULONG|BIND,		/* [TIND] */
+	0,				/* [TFUNC] */
+	0,				/* [TARRAY] */
+	0,				/* [TVOID] */
+	BSTRUCT,			/* [TSTRUCT] */
+	BUNION,				/* [TUNION] */
+	0,				/* [TENUM] */
+};
+
+static long ncast64[NTYPE] =
+{
+	0,				/* [TXXX] */
+	BCHAR|BUCHAR,			/* [TCHAR] */
+	BCHAR|BUCHAR,			/* [TUCHAR] */
+	BSHORT|BUSHORT,			/* [TSHORT] */
+	BSHORT|BUSHORT,			/* [TUSHORT] */
+	BINT|BUINT|BLONG|BULONG,	/* [TINT] */
+	BINT|BUINT|BLONG|BULONG,	/* [TUINT] */
+	BINT|BUINT|BLONG|BULONG,	/* [TLONG] */
+	BINT|BUINT|BLONG|BULONG,	/* [TULONG] */
+	BVLONG|BUVLONG|BIND,		/* [TVLONG] */
+	BVLONG|BUVLONG|BIND,		/* [TUVLONG] */
+	BFLOAT,				/* [TFLOAT] */
+	BDOUBLE,			/* [TDOUBLE] */
+	BVLONG|BUVLONG|BIND,		/* [TIND] */
+	0,				/* [TFUNC] */
+	0,				/* [TARRAY] */
+	0,				/* [TVOID] */
+	BSTRUCT,			/* [TSTRUCT] */
+	BUNION,				/* [TUNION] */
+	0,				/* [TENUM] */
+};
--- /dev/null
+++ b/sys/src/cmd/jl/asm.c
@@ -1,0 +1,975 @@
+#include	"l.h"
+#define Sym Aoutsym
+#include	<a.out.h>
+#undef Sym
+
+long	OFFSET;
+
+xlong
+entryvalue(void)
+{
+	char *a;
+	Sym *s;
+
+	a = INITENTRY;
+	if(*a >= '0' && *a <= '9')
+		return atolwhex(a);
+	s = lookup(a, 0);
+	if(s->type == 0)
+		return INITTEXT;
+	if(s->type != STEXT && s->type != SLEAF)
+		diag("entry not text: %s", s->name);
+	return s->value + INITTEXT;
+}
+
+void
+asmb(void)
+{
+	Prog *p;
+	long t, etext;
+	Optab *o;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f asm\n", cputime());
+	Bflush(&bso);
+	OFFSET = HEADR;
+	seek(cout, OFFSET, 0);
+	pc = 0;
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT) {
+			/* align on word boundary */
+			if(!debug['c'] && (pc & 2) != 0){
+				nopalign.pc = pc;
+				pc += asmout(&nopalign, oplook(&nopalign), 0);
+			}
+			curtext = p;
+			autosize = p->to.offset + ptrsize;
+		}
+		if(p->pc != pc) {
+			diag("phase error %lux sb %lux",
+				p->pc, pc);
+			if(!debug['a'])
+				prasm(curp);
+			pc = p->pc;
+		}
+		curp = p;
+		o = oplook(p);	/* could probably avoid this call */
+		pc += asmout(p, o, 0);
+	}
+	if(debug['a'])
+		Bprint(&bso, "\n");
+	Bflush(&bso);
+	cflush();
+
+	etext = textsize;
+	for(t = pc; t < etext; t += sizeof(buf)-100) {
+		if(etext-t > sizeof(buf)-100)
+			datblk(t, sizeof(buf)-100, 1);
+		else
+			datblk(t, etext-t, 1);
+	}
+
+	Bflush(&bso);
+	cflush();
+
+	curtext = P;
+	switch(HEADTYPE) {
+	case 0:
+	case 4:
+		OFFSET = rnd(HEADR+textsize, 4096);
+		seek(cout, OFFSET, 0);
+		break;
+	case 1:
+	case 2:
+	case 3:
+	case 5:
+	case 6:
+		OFFSET = HEADR+textsize;
+		seek(cout, OFFSET, 0);
+		break;
+	}
+	for(t = 0; t < datsize; t += sizeof(buf)-100) {
+		if(datsize-t > sizeof(buf)-100)
+			datblk(t, sizeof(buf)-100, 0);
+		else
+			datblk(t, datsize-t, 0);
+	}
+
+	symsize = 0;
+	lcsize = 0;
+	if(!debug['s']) {
+		if(debug['v'])
+			Bprint(&bso, "%5.2f sym\n", cputime());
+		Bflush(&bso);
+		switch(HEADTYPE) {
+		case 0:
+		case 4:
+			OFFSET = rnd(HEADR+textsize, 4096)+datsize;
+			seek(cout, OFFSET, 0);
+			break;
+		case 3:
+		case 2:
+		case 1:
+		case 5:
+		case 6:
+			OFFSET = HEADR+textsize+datsize;
+			seek(cout, OFFSET, 0);
+			break;
+		}
+		if(!debug['s'])
+			asmsym();
+		if(debug['v'])
+			Bprint(&bso, "%5.2f pc\n", cputime());
+		Bflush(&bso);
+		if(!debug['s'])
+			asmlc();
+		cflush();
+	}
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f header\n", cputime());
+	Bflush(&bso);
+	OFFSET = 0;
+	seek(cout, OFFSET, 0);
+	switch(HEADTYPE) {
+	case 1:
+		break;
+	case 2:
+		t = thechar == 'j'? (debug['X']? B_MAGIC: Y_MAGIC): Z_MAGIC;
+		lput(t);
+		lput(textsize);			/* sizes */
+		lput(datsize);
+		lput(bsssize);
+		lput(symsize);			/* nsyms */
+		lput(entryvalue());		/* va of entry */
+		lput(0L);
+		lput(lcsize);
+		if (t & HDR_MAGIC)
+			llput(entryvalue());	/* va of entry */
+		break;
+	case 5:
+		if(thechar == 'j')
+			elf64(243, ELFDATA2LSB, 0, nil); /* 243 is RISCV */
+		else
+			elf32(243, ELFDATA2LSB, 0, nil);
+	}
+	cflush();
+}
+
+void
+strnput(char *s, int n)
+{
+	for(; *s; s++){
+		cput(*s);
+		n--;
+	}
+	for(; n > 0; n--)
+		cput(0);
+}
+
+void
+cput(int c)
+{
+	cbp[0] = c;
+	cbp++;
+	cbc--;
+	if(cbc <= 0)
+		cflush();
+}
+
+void
+wput(long l)
+{
+
+	cbp[0] = l>>8;
+	cbp[1] = l;
+	cbp += 2;
+	cbc -= 2;
+	if(cbc <= 0)
+		cflush();
+}
+
+void
+wputl(long l)
+{
+
+	cbp[0] = l;
+	cbp[1] = l>>8;
+	cbp += 2;
+	cbc -= 2;
+	if(cbc <= 0)
+		cflush();
+}
+
+void
+lput(long l)
+{
+
+	cbp[0] = l>>24;
+	cbp[1] = l>>16;
+	cbp[2] = l>>8;
+	cbp[3] = l;
+	cbp += 4;
+	cbc -= 4;
+	if(cbc <= 0)
+		cflush();
+}
+
+void
+lputl(long l)
+{
+
+	cbp[3] = l>>24;
+	cbp[2] = l>>16;
+	cbp[1] = l>>8;
+	cbp[0] = l;
+	cbp += 4;
+	cbc -= 4;
+	if(cbc <= 0)
+		cflush();
+}
+
+void
+llput(vlong v)
+{
+	lput(v>>32);
+	lput(v);
+}
+
+void
+llputl(vlong v)
+{
+	lputl(v);
+	lputl(v>>32);
+}
+
+void
+cflush(void)
+{
+	int n;
+
+	n = sizeof(buf.cbuf) - cbc;
+	if(n)
+		write(cout, buf.cbuf, n);
+	cbp = buf.cbuf;
+	cbc = sizeof(buf.cbuf);
+}
+
+void
+nopstat(char *f, Count *c)
+{
+	if(c->outof)
+	Bprint(&bso, "%s delay %ld/%ld (%.2f)\n", f,
+		c->outof - c->count, c->outof,
+		(double)(c->outof - c->count)/c->outof);
+}
+
+void
+asmsym(void)
+{
+	Prog *p;
+	Auto *a;
+	Sym *s;
+	int h;
+
+	s = lookup("etext", 0);
+	if(s->type == STEXT)
+		putsymb(s->name, 'T', s->value+INITTEXT, s->version);
+
+	for(h=0; h<NHASH; h++)
+		for(s=hash[h]; s!=S; s=s->link)
+			switch(s->type) {
+			case SCONST:
+				putsymb(s->name, 'D', s->value, s->version);
+				continue;
+
+			case SSTRING:
+				putsymb(s->name, 'T', s->value, s->version);
+				continue;
+
+			case SDATA:
+				putsymb(s->name, 'D', s->value+INITDAT, s->version);
+				continue;
+
+			case SBSS:
+				putsymb(s->name, 'B', s->value+INITDAT, s->version);
+				continue;
+
+			case SFILE:
+				putsymb(s->name, 'f', s->value, s->version);
+				continue;
+			}
+
+	for(p=textp; p!=P; p=p->cond) {
+		s = p->from.sym;
+		if(s->type != STEXT && s->type != SLEAF)
+			continue;
+
+		/* filenames first */
+		for(a=p->to.autom; a; a=a->link)
+			if(a->type == D_FILE)
+				putsymb(a->asym->name, 'z', a->aoffset, 0);
+			else
+			if(a->type == D_FILE1)
+				putsymb(a->asym->name, 'Z', a->aoffset, 0);
+
+		if(s->type == STEXT)
+			putsymb(s->name, 'T', s->value+INITTEXT, s->version);
+		else
+			putsymb(s->name, 'L', s->value+INITTEXT, s->version);
+
+		/* frame, auto and param after */
+		putsymb(".frame", 'm', p->to.offset+ptrsize, 0);
+		for(a=p->to.autom; a; a=a->link)
+			if(a->type == D_AUTO)
+				putsymb(a->asym->name, 'a', -a->aoffset, 0);
+			else
+			if(a->type == D_PARAM)
+				putsymb(a->asym->name, 'p', a->aoffset, 0);
+	}
+	if(debug['v'] || debug['n'])
+		Bprint(&bso, "symsize = %lud\n", symsize);
+	Bflush(&bso);
+}
+
+void
+putsymb(char *s, int t, vlong v, int ver)
+{
+	int i, f, l;
+
+	if(t == 'f')
+		s++;
+	if(thechar == 'j'){
+		l = 8;
+		llput(v);
+	}else{
+		l = 4;
+		lput(v);
+	}
+	if(ver)
+		t += 'a' - 'A';
+	cput(t+0x80);			/* 0x80 is variable length */
+
+	if(t == 'Z' || t == 'z') {
+		cput(s[0]);
+		for(i=1; s[i] != 0 || s[i+1] != 0; i += 2) {
+			cput(s[i]);
+			cput(s[i+1]);
+		}
+		cput(0);
+		cput(0);
+		i++;
+	}
+	else {
+		for(i=0; s[i]; i++)
+			cput(s[i]);
+		cput(0);
+	}
+	symsize += l + 1 + i + 1;
+
+	if(debug['n']) {
+		if(t == 'z' || t == 'Z') {
+			Bprint(&bso, "%c %.8llux ", t, v);
+			for(i=1; s[i] != 0 || s[i+1] != 0; i+=2) {
+				f = ((s[i]&0xff) << 8) | (s[i+1]&0xff);
+				Bprint(&bso, "/%x", f);
+			}
+			Bprint(&bso, "\n");
+			return;
+		}
+		if(ver)
+			Bprint(&bso, "%c %.8llux %s<%d>\n", t, v, s, ver);
+		else
+			Bprint(&bso, "%c %.8llux %s\n", t, v, s);
+	}
+}
+
+#define	MINLC	2
+void
+asmlc(void)
+{
+	long oldpc, oldlc;
+	Prog *p;
+	long v, s;
+
+	oldpc = 0;
+	oldlc = 0;
+	for(p = firstp; p != P; p = p->link) {
+		if(p->line == oldlc || p->as == ATEXT || p->as == ANOP) {
+			if(p->as == ATEXT)
+				curtext = p;
+			if(debug['L'])
+				Bprint(&bso, "%6lux %P\n",
+					p->pc, p);
+			continue;
+		}
+		if(debug['L'])
+			Bprint(&bso, "\t\t%6ld", lcsize);
+		v = (p->pc - oldpc) / MINLC;
+		while(v) {
+			s = 127;
+			if(v < 127)
+				s = v;
+			cput(s+128);	/* 129-255 +pc */
+			if(debug['L'])
+				Bprint(&bso, " pc+%ld*%d(%ld)", s, MINLC, s+128);
+			v -= s;
+			lcsize++;
+		}
+		s = p->line - oldlc;
+		oldlc = p->line;
+		oldpc = p->pc + MINLC;
+		if(s > 64 || s < -64) {
+			cput(0);	/* 0 vv +lc */
+			cput(s>>24);
+			cput(s>>16);
+			cput(s>>8);
+			cput(s);
+			if(debug['L']) {
+				if(s > 0)
+					Bprint(&bso, " lc+%ld(%d,%ld)\n",
+						s, 0, s);
+				else
+					Bprint(&bso, " lc%ld(%d,%ld)\n",
+						s, 0, s);
+				Bprint(&bso, "%6lux %P\n",
+					p->pc, p);
+			}
+			lcsize += 5;
+			continue;
+		}
+		if(s > 0) {
+			cput(0+s);	/* 1-64 +lc */
+			if(debug['L']) {
+				Bprint(&bso, " lc+%ld(%ld)\n", s, 0+s);
+				Bprint(&bso, "%6lux %P\n",
+					p->pc, p);
+			}
+		} else {
+			cput(64-s);	/* 65-128 -lc */
+			if(debug['L']) {
+				Bprint(&bso, " lc%ld(%ld)\n", s, 64-s);
+				Bprint(&bso, "%6lux %P\n",
+					p->pc, p);
+			}
+		}
+		lcsize++;
+	}
+	while(lcsize & 1) {
+		s = 129;
+		cput(s);
+		lcsize++;
+	}
+	if(debug['v'] || debug['L'])
+		Bprint(&bso, "lcsize = %ld\n", lcsize);
+	Bflush(&bso);
+}
+
+void
+datblk(long s, long n, int str)
+{
+	Prog *p;
+	char *cast;
+	vlong d;
+	long l, fl, j;
+	int i, c;
+
+	memset(buf.dbuf, 0, n+100);
+	for(p = datap; p != P; p = p->link) {
+		curp = p;
+		if(str != (p->from.sym->type == SSTRING))
+			continue;
+		l = p->from.sym->value + p->from.offset - s;
+		c = p->reg;
+		i = 0;
+		if(l < 0) {
+			if(l+c <= 0)
+				continue;
+			while(l < 0) {
+				l++;
+				i++;
+			}
+		}
+		if(l >= n)
+			continue;
+		if(p->as != AINIT && p->as != ADYNT) {
+			for(j=l+(c-i)-1; j>=l; j--)
+				if(buf.dbuf[j]) {
+					print("%P\n", p);
+					diag("multiple initialization");
+					break;
+				}
+		}
+		switch(p->to.type) {
+		default:
+			diag("unknown mode in initialization\n%P", p);
+			break;
+
+		case D_FCONST:
+			switch(c) {
+			default:
+			case 4:
+				fl = ieeedtof(p->to.ieee);
+				cast = (char*)&fl;
+				for(; i<c; i++) {
+					buf.dbuf[l] = cast[fnuxi8[i]];
+					l++;
+				}
+				break;
+			case 8:
+				cast = (char*)p->to.ieee;
+				for(; i<c; i++) {
+					buf.dbuf[l] = cast[fnuxi8[i]];
+					l++;
+				}
+				break;
+			}
+			break;
+
+		case D_SCONST:
+			for(; i<c; i++) {
+				buf.dbuf[l] = p->to.sval[i];
+				l++;
+			}
+			break;
+
+		case D_VCONST:
+			d = *p->to.vval;
+			goto dconst;
+
+		case D_CONST:
+			d = p->to.offset;
+		dconst:
+			if(p->to.sym) {
+				switch(p->to.sym->type) {
+				case STEXT:
+				case SLEAF:
+				case SSTRING:
+					d += (p->to.sym->value + INITTEXT);
+					break;
+				case SDATA:
+				case SBSS:
+					d += (p->to.sym->value + INITDAT);
+					break;
+				}
+			}
+			cast = (char*)&d;
+			switch(c) {
+			default:
+				diag("bad nuxi %d %d\n%P", c, i, curp);
+				break;
+			case 1:
+				for(; i<c; i++) {
+					buf.dbuf[l] = cast[inuxi1[i]];
+					l++;
+				}
+				break;
+			case 2:
+				for(; i<c; i++) {
+					buf.dbuf[l] = cast[inuxi2[i]];
+					l++;
+				}
+				break;
+			case 4:
+				for(; i<c; i++) {
+					buf.dbuf[l] = cast[inuxi4[i]];
+					l++;
+				}
+				break;
+			case 8:
+				for(; i<c; i++) {
+					buf.dbuf[l] = cast[inuxi8[i]];
+					l++;
+				}
+				break;
+			}
+			break;
+		}
+		if(debug['d'] && i == c) {
+			Bprint(&bso, "%.8llux", l+s+INITDAT-c);
+			for(j = -c; j<0; j++)
+				Bprint(&bso, " %.2ux", ((uchar*)buf.dbuf)[l + j]);
+			Bprint(&bso, "\t%P\n", curp);
+		}
+	}
+	write(cout, buf.dbuf, n);
+}
+
+#define R(r) ((r)&0x1F)
+#define OPX	(0x3 | o->op<<2)
+#define OPF (OPX | o->func3<<12)
+#define OP_R(rs1,rs2,rd)\
+	(OPF | rd<<7 | R(rs1)<<15 | R(rs2)<<20 | o->param<<25)
+#define OP_RF(rs1,rs2,rd,rm)\
+	(OPX | rm<<12 | rd<<7 | R(rs1)<<15 | R(rs2)<<20 | o->param<<25)
+#define OP_RO(rs1,rs2,rd)\
+	(0x3 | OOP<<2 | o->func3<<12 | rd<<7 | R(rs1)<<15 | R(rs2)<<20)
+#define OP_ADD(rs1,rs2,rd)\
+	(0x3 | OOP<<2 | rd<<7 | R(rs1)<<15 | R(rs2)<<20)
+#define OP_I(rs1,rd,imm)\
+	(OPF | rd<<7 | R(rs1)<<15 | (imm)<<20)
+#define OP_FI(func3,rs1,rd,imm)\
+	(OPX | func3<<12 | rd<<7 | R(rs1)<<15 | (imm)<<20)
+#define OP_S(rs1,rs2,imm)\
+	(OPF | (imm&0x1F)<<7 | R(rs1)<<15 | R(rs2)<<20 | (imm>>5)<<25)
+#define OP_B(rs1,rs2,imm)\
+	(OPF | R(rs1)<<15 | R(rs2)<<20 | (imm&0x800)>>4 | (imm&0x1E)<<7 | \
+	 (imm&0x7E0)<<20 | (imm&0x1000)<<19)
+#define OP_U(rd,imm)\
+	(0x3 | OLUI<<2 | rd<<7 | (imm&0xFFFFF000))
+#define OP_UP(rd,imm)\
+	(0x3 | OAUIPC<<2 | rd<<7 | (imm&0xFFFFF000))
+#define OP_J(rd,imm)\
+	(OPX | rd<<7 | (imm&0xff000) | (imm&0x800)<<9 | (imm&0x7FE)<<20 | (imm&0x100000)<<11)
+
+/*
+ * aflag: 0 - assemble to object file
+ *        1 - return assembled instruction
+ *        2 - first pass, return length of assembled instruction
+ *        3 - later pass, return length of assembled instruction
+ */
+int
+asmout(Prog *p, Optab *o, int aflag)
+{
+	vlong vv;
+	long o1, o2, o3, v;
+	int r;
+
+	o1 = 0;
+	o2 = 0;
+	o3 = 0;
+	r = p->reg;
+	if(r == NREG) switch(p->as){
+		case AMOVF:
+		case AMOVD:
+			if(p->from.type == D_FREG && p->to.type == D_FREG)
+				r = p->from.reg;
+			break;
+		case AMOV:
+		case AJMP:
+			r = REGZERO;
+			break;
+		case AJAL:
+			r = REGLINK;
+			break;
+		default:
+			r = p->to.reg;
+			break;
+	}
+	if(!debug['c'] && o->ctype){
+		o1 = asmcompressed(p, o, r, aflag == 2);
+		if(o1 != 0){
+			switch(aflag){
+			case 1:
+				return o1;
+			case 2:
+			case 3:
+				return 2;
+			}
+			if(debug['a']){
+				v = p->pc + INITTEXT;
+				Bprint(&bso, " %.8lux: %.4lux    \t%P\n", v, o1, p);
+			}
+			wputl(o1);
+			return 2;
+		}
+	}
+	if(aflag >= 2)
+		return o->size;
+	switch(o->type) {
+	default:
+		diag("unknown type %d", o->type);
+		if(!debug['a'])
+			prasm(p);
+		break;
+
+	case 0:		/* add S,[R,]D */
+		o1 = OP_R(r, p->from.reg, p->to.reg);
+		break;
+
+	case 1:		/* slli $I,[R,]D */
+		v = p->from.offset & 0x3F;
+		if(thechar != 'j')
+			v &= 0x1F;
+		v |= (o->param<<5);
+		o1 = OP_I(r, p->to.reg, v);
+		break;
+
+	case 2:		/* addi $I,[R,]D */
+		v = p->from.offset;
+		if(v < -BIG || v >= BIG)
+			diag("imm out of range\n%P", p);
+		o1 = OP_I(r, p->to.reg, v);
+		break;
+	
+	case 3:		/* beq S,[R,]L */
+		if(r == NREG)
+			r = REGZERO;
+		if(p->cond == P)
+			v = 0;
+		else
+			v = (p->cond->pc - pc);
+		if(v < -0x1000 || v >= 0x1000)
+			diag("branch out of range\n%P", p);
+		o1 = OP_B(r, p->from.reg, v);
+		break;
+
+	case 4:		/* jal	[D,]L */
+		if(p->cond == P)
+			v = 0;
+		else
+			v = (p->cond->pc - pc);
+		if(v < -0x100000 || v >= 0x100000)
+			diag("jump out of range\n%P", p);
+		o1 = OP_J(r, v);
+		break;
+
+	case 5:		/* jalr [D,]I(S) */
+		v = regoff(&p->to);
+		if(v < -BIG || v >= BIG)
+			diag("imm out of range\n%P", p);
+		o1 = OP_I(classreg(&p->to), r, v);
+		break;
+
+	case 6:		/* sb	R,I(S) */
+		v = regoff(&p->to);
+		r = classreg(&p->to);
+		if(v < -BIG || v >= BIG)
+			diag("imm out of range\n%P", p);
+		o1 = OP_S(r, p->from.reg, v);
+		break;
+
+	case 7:		/* lb	I(S),D */
+		v = regoff(&p->from);
+		r = classreg(&p->from);
+		if(v < -BIG || v >= BIG)
+			diag("imm out of range\n%P", p);
+		o1 = OP_I(r, p->to.reg, v);
+		break;
+
+	case 8:		/* lui	I,D */
+		v = p->from.offset;
+		o1 = OP_U(p->to.reg, v);
+		break;
+
+	case 9:		/* lui	I1,D; addi I0,D */
+		v = regoff(&p->from);
+		if(thechar == 'j' && v >= 0x7ffff800){
+			/* awkward edge case */
+			o1 = OP_U(p->to.reg, -v);
+			v &= 0xFFF;
+			o2 = OP_FI(4, p->to.reg, p->to.reg, v);	/* xori */
+			break;
+		}
+		if(v & 0x800)
+			v += 0x1000;
+		o1 = OP_U(p->to.reg, v);
+		v &= 0xFFF;
+		o2 = OP_I(p->to.reg, p->to.reg, v);
+		break;
+
+	case 10:	/* sign extend */
+		if(p->as == AMOVBU) {
+			o1 = OP_I(p->from.reg, p->to.reg, o->param);
+			break;
+		}
+		v = o->param;
+		if(thechar == 'j')
+			v += 32;
+		o1 = OP_FI(1, p->from.reg, p->to.reg, v & 0x3F);	/* slli */
+		o2 = OP_I(p->to.reg, p->to.reg, v);	/* srli or srai */
+		break;
+
+	case 11:		/* addi $I,R,D */
+		v = regoff(&p->from);
+		if(v < -BIG || v >= BIG)
+			diag("imm out of range\n%P", p);
+		o1 = OP_I(classreg(&p->from), p->to.reg, v);
+		break;
+
+	case 12:		/* mov r,lext => lui/auipc I1,T; sb r,I0(T) */
+		v = regoff(&p->to);
+		if(thechar == 'j'){
+			vv = v + INITDAT + BIG - INITTEXT - pc;
+			v = (long)vv;
+			if(v != vv || (v&~0x7FF) == 0x7FFFF800)
+				diag("address out of range\n%P", p);
+		}else
+			v += INITDAT + BIG;
+		if(v & 0x800)
+			v += 0x1000;
+		o1 = thechar == 'j' ? OP_UP(REGTMP, v) : OP_U(REGTMP, v);
+		v &= 0xFFF;
+		o2 = OP_S(REGTMP, p->from.reg, v);
+		break;
+
+	case 13:		/* mov lext, r => lui/auipc I1,T; lb r,I0(T) */
+		v = regoff(&p->from);
+		if(thechar == 'j'){
+			vv = v + INITDAT + BIG - INITTEXT - pc;
+			v = (long)vv;
+			if(v != vv || (v&~0x7FF) == 0x7FFFF800)
+				diag("address out of range\n%P", p);
+		}else
+			v += INITDAT + BIG;
+		if(v & 0x800)
+			v += 0x1000;
+		o1 = thechar == 'j' ? OP_UP(REGTMP, v) : OP_U(REGTMP, v);
+		v &= 0xFFF;
+		o2 = OP_I(REGTMP, p->to.reg, v);
+		break;
+
+	case 14:		/* op $lcon,[r,]d => lui L1,T; addi $L0,T,T; op T,r,d */
+		v = regoff(&p->from);
+		if(p->as == AMOVW || p->as == AMOV)
+			r = classreg(&p->from);
+		if(thechar == 'j' && v >= 0x7ffff800){
+			/* awkward edge case */
+			o1 = OP_U(p->to.reg, -v);
+			v &= 0xFFF;
+			o2 = OP_FI(4, p->to.reg, p->to.reg, v);	/* xori */
+		}else{
+			if(v & 0x800)
+				v += 0x1000;
+			o1 = OP_U(REGTMP, v);
+			v &= 0xFFF;
+			o2 = OP_FI(0, REGTMP, REGTMP, v);	/* addi */
+		}
+		o3 = OP_RO(r, REGTMP, p->to.reg);
+		break;
+
+	case 15:		/* mov r,L(s) => lui L1,T; add s,T,T; sb r,L0(T) */
+		v = regoff(&p->to);
+		r = classreg(&p->to);
+		if(v & 0x800)
+			v += 0x1000;
+		o1 = OP_U(REGTMP, v);
+		v &= 0xFFF;
+		o2 = OP_ADD(r, REGTMP, REGTMP);
+		o3 = OP_S(REGTMP, p->from.reg, v);
+		break;
+
+	case 16:		/* mov L(s),r => lui L1,T; add s,T,T; lb r,L0(T) */
+		v = regoff(&p->from);
+		r = classreg(&p->from);
+		if(v & 0x800)
+			v += 0x1000;
+		o1 = OP_U(REGTMP, v);
+		v &= 0xFFF;
+		o2 = OP_ADD(r, REGTMP, REGTMP);
+		o3 = OP_I(REGTMP, p->to.reg, v);
+		break;
+
+	case 17:	/* fcvt S,D */
+		v = 7;			/* dynamic rounding mode */
+		if(o->a3 == C_REG)	/* convert to int? */
+			v = 1;		/* round towards zero */
+		o1 = OP_RF(p->from.reg, o->func3, p->to.reg, v);
+		break;
+
+	case 18:	/* lui/auipc L1, T; jal [r,]L0(T) */
+		/* p->cond->pc == p->pc here; pc is current instruction */
+		if(p->cond == P)
+			v = 0;
+		else
+			v = p->cond->pc - (pc + INITTEXT);
+		if(thechar == 'j'){
+			vv = v + INITTEXT;
+			v = (long)vv;
+			if(v != vv || (v&~0x7FF) == 0x7FFFF800)
+				diag("branch out of range\n%P", p);
+		}else
+			v += INITTEXT;
+		/* if low immediate offset looks negative, skip to next page */
+		if(v & 0x800)
+			v += 0x1000;
+		o1 = thechar == 'j' ? OP_UP(REGTMP, v) : OP_U(REGTMP, v);
+		v &= 0xFFF;
+		o2 = OP_I(REGTMP, r, v);
+		break;
+
+	case 19:	/* addiw $0, rs, rd */
+		v = 0;
+		o1 = OP_I(p->from.reg, p->to.reg, v);
+		break;
+
+	case 20:	/* lui/auipc I1,D; addi I0; D */
+		if(thechar == 'j'){
+			vv = regoff(&p->from) + instoffx - (pc + INITTEXT);
+			v = (long)vv;
+			if(v != vv || (v&~0x7FF) == 0x7FFFF800)
+				diag("address %llux out of range\n%P",
+					regoff(&p->from) + instoffx, p);
+		}else{
+			v = regoff(&p->from) + instoffx;
+		}
+		if(v & 0x800)
+			v += 0x1000;
+		o1 = thechar == 'j' ? OP_UP(p->to.reg, v) : OP_U(p->to.reg, v);
+		v &= 0xFFF;
+		o2 = OP_I(p->to.reg, p->to.reg, v);
+		break;
+
+	case 21:	/* lui I,D; s[lr]ai N,D */
+		vv = *p->from.vval;
+		v = vconshift(vv);
+		if(v < 0)
+			diag("64 bit constant error:\n%P", p);
+		if(v < 12)
+			vv <<= 12 - v;
+		else
+			vv >>= v - 12;
+		o1 = OP_U(p->to.reg, (long)vv);
+		if (v > 12)
+			o2 = OP_FI(1, p->to.reg, p->to.reg, v - 12);	/* slli */
+		else
+			o2 = OP_I(p->to.reg, p->to.reg, 12 - v);	/* srai */
+		break; 
+
+	case 22:	/* CSRRx C, rs, rd */
+		v = p->from.offset & 0xFFF;
+		o1 = OP_I(p->reg, p->to.reg, v);
+		break;
+
+	case 24:		/* SYS */
+		v = p->to.offset & 0xFFF;
+		o1 = OP_I(0, 0, v);
+		break;
+
+	case 25:		/* word $x */
+		o1 = regoff(&p->to);
+		break;
+
+	case 26:		/* pseudo ops */
+		break;
+	}
+	if(aflag)
+		return o1;
+	v = p->pc + INITTEXT;
+	switch(o->size) {
+	default:
+		if(debug['a'])
+			Bprint(&bso, " %.8lux:\t\t%P\n", v, p);
+		break;
+	case 4:
+		if(debug['a'])
+			Bprint(&bso, " %.8lux: %.8lux\t%P\n", v, o1, p);
+		lputl(o1);
+		break;
+	case 8:
+		if(debug['a'])
+			Bprint(&bso, " %.8lux: %.8lux %.8lux%P\n", v, o1, o2, p);
+		lputl(o1);
+		lputl(o2);
+		break;
+	case 12:
+		if(debug['a'])
+			Bprint(&bso, " %.8lux: %.8lux %.8lux %.8lux%P\n", v, o1, o2, o3, p);
+		lputl(o1);
+		lputl(o2);
+		lputl(o3);
+		break;
+	}
+	return o->size;
+}
+
--- /dev/null
+++ b/sys/src/cmd/jl/compat.c
@@ -1,0 +1,67 @@
+#include	"l.h"
+
+/*
+ * fake malloc
+ */
+void*
+malloc(uintptr n)
+{
+	void *p;
+
+	while(n & 7)
+		n++;
+	while(nhunk < n)
+		gethunk();
+	p = hunk;
+	nhunk -= n;
+	hunk += n;
+	return p;
+}
+
+void*
+mallocz(uintptr n, int clr)
+{
+	void *p;
+
+	while(n & 7)
+		n++;
+	while(nhunk < n)
+		gethunk();
+	p = hunk;
+	if (clr)
+		memset(p, 0, n);
+	nhunk -= n;
+	hunk += n;
+	return p;
+}
+
+void
+free(void *p)
+{
+	USED(p);
+}
+
+void*
+calloc(uintptr m, uintptr n)
+{
+	void *p;
+
+	n *= m;
+	p = malloc(n);
+	memset(p, 0, n);
+	return p;
+}
+
+void*
+realloc(void*, uintptr)
+{
+	fprint(2, "realloc called\n");
+	abort();
+	return 0;
+}
+
+void
+setmalloctag(void *v, uintptr pc)
+{
+	USED(v, pc);
+}
--- /dev/null
+++ b/sys/src/cmd/jl/compress.c
@@ -1,0 +1,270 @@
+#include	"l.h"
+
+#define COMPREG(r) ((r & ~0x7) == 0x8)
+#define COP_CR(op,rs,rd)\
+	(op | (rs)<<2 | (rd)<<7)
+#define COP_CI(op,rd,i)\
+	(op | (rd)<<7 | ((i)&0x20)<<7 | ((i)&0x1F)<<2)
+#define COP_CIW(op,rd,i)\
+	(op | (rd)<<2 | (i)<<5)
+#define COP_CJ(op,i)\
+	(op | (i)<<2)
+#define COP_CB(op,rs,i)\
+	(op | (rs)<<7 | ((i)&0x1f)<<2 | ((i)&0xE0)<<5)
+#define COP_CL(op,rs,rd,i)\
+	(op | (rs)<<7 | (rd)<<2 | ((i)&0x7)<<4 | ((i)&0x38)<<7)
+#define COP_CSS(op,rs,i)\
+	(op | (rs)<<2 | ((i)&0x3F)<<7)
+#define COP_CS(op,rs2,rs1,i)\
+	(op | (rs2)<<2 | (rs1)<<7 | ((i)&0x7)<<4 | ((i)&0x38)<<7)
+
+static int
+immbits(int v, char *permute)
+{
+	int r, i, c;
+
+	r = 0;
+	for(i = 0; (c = *permute++) != 0; i++)
+		r |= ((v>>c) & 0x01) << i;
+	return r;
+}
+
+long
+asmcjmp(int a, Prog *p, int first)
+{
+	long v;
+
+	if(p->cond == P)
+		v = 0;
+	else
+		v = (p->cond->pc - p->pc);
+	if(first || ((v&0x01) == 0 && v >= -0x800 && v < 0x800))
+		return COP_CJ(a, immbits(v, "\5\1\2\3\7\6\12\10\11\4\13"));
+	return 0;
+}
+
+int
+asmcbz(int a, Prog *p, int first)
+{
+	long v;
+	int r;
+
+	r = p->reg;
+	if(r == REGZERO || r == NREG)
+		r = p->from.reg;
+	else if(p->from.reg != REGZERO)
+		return 0;
+	if(!COMPREG(r))
+		return 0;
+	if(p->cond == P)
+		v = 0;
+	else
+		v = (p->cond->pc - p->pc);
+	if(first || ((v&0x01) == 0 && v >= -0x100 && v < 0x100))
+		return COP_CB(a, r&0x7, immbits(v, "\5\1\2\6\7\3\4\10"));
+	return 0;
+}
+
+int
+asmcload(Prog *p, int a, uint len, uint maxoff)
+{
+	int v;
+	int r;
+
+	v = regoff(&p->from);
+	if((v & (len-1)) != 0 || v < 0)
+		return 0;
+	r = classreg(&p->from);
+	if(COMPREG(r) && COMPREG(p->to.reg)){
+		if(v < maxoff){
+			v |= (v>>5) & ~0x1;
+			return COP_CL(a, r&0x7, p->to.reg&0x7, v);
+		}
+	}else if(r == REGSP){
+		if(v < 2*maxoff){
+			v |= (v>>6);
+			return COP_CI(a | 0x2, p->to.reg, v);
+		}
+	}
+	return 0;
+}
+
+int
+asmcstore(Prog *p, int a, uint len, uint maxoff)
+{
+	int v;
+	int r;
+
+	v = regoff(&p->to);
+	if((v & (len-1)) != 0 || v < 0)
+		return 0;
+	r = classreg(&p->to);
+	if(COMPREG(r) && COMPREG(p->from.reg)){
+		if(v < maxoff){
+			v |= (v>>5) & ~0x1;
+			return COP_CS(a, p->from.reg&0x7, r&0x7, v);
+		}
+	}else if(r == REGSP){
+		if(v < 2*maxoff){
+			v |= (v>>6);
+			return COP_CSS(a | 0x2, (p->from.reg&0x1F), v);
+		}
+	}
+	return 0;
+}
+
+int
+asmcompressed(Prog *p, Optab *o, int r, int first)
+{
+	long v;
+	int a;
+
+	switch(o->ctype){
+	case 1: /* C.ADD */
+		if(p->from.reg != REGZERO && p->to.reg != REGZERO && r == p->to.reg)
+			return COP_CR(0x9002, p->from.reg, r);
+		break;
+	case 2:	/* C.MV */
+		if(p->from.type != D_REG)
+			diag("compress MOVW R,R doesn't apply\n%P", p);
+		if(p->to.reg != REGZERO){
+			if(p->from.type == D_REG && p->from.reg != REGZERO)
+				return COP_CR(0x8002, p->from.reg, p->to.reg);
+			else
+				return COP_CI(0x4001, p->to.reg, 0);
+		}
+		break;
+	case 3:	/* C.JALR */
+		if(r == REGLINK && p->to.reg != REGZERO && p->to.offset == 0)
+			return COP_CR(0x9002, 0, p->to.reg);
+		break;
+	case 4:	/* C.JR */
+		if(p->to.reg != REGZERO &&p->to.offset == 0)
+			return COP_CR(0x8002, 0, p->to.reg);
+		break;
+	case 5:	/* C.AND C.OR C.SUB C.XOR */
+		if(r == p->to.reg && COMPREG(p->from.reg) && COMPREG(p->to.reg)){
+			v = 0x8C01;
+			switch(o->as){
+			case AXOR:
+				v |= 1<<5;
+				break;
+			case AOR:
+				v |= 2<<5;
+				break;
+			case AAND:
+				v |= 3<<5;
+				break;
+			}
+			return COP_CR(v, p->from.reg&0x7, p->to.reg&0x7);
+		}
+		break;
+	case 6:	/* C.LI */
+		v = p->from.offset;
+		if(p->to.reg != REGZERO && v >= -0x20 && v < 0x20){
+			return COP_CI(0x4001, p->to.reg, v);
+		}
+		break;
+	case 7: /* C.LUI */
+		v = p->from.offset;
+		if((v&0xFFF) != 0)
+			return 0;
+		v >>= 12;
+		if(p->to.reg != REGZERO && p->to.reg != REGSP && v >= -0x20 && v < 0x20)
+			return COP_CI(0x6001, p->to.reg, v);
+		break;
+	case 8: /* C.SLLI */
+		v = p->from.offset;
+		if((v & 0x20) != 0 && thechar == 'i')
+			break;
+		if(r == p->to.reg && r != REGZERO && v != 0 && (v & ~0x3F) == 0)
+			return COP_CI(0x0002, p->to.reg, v);
+		break;
+	case 9:	/* C.SRAI C.SRLI */
+		v = p->from.offset;
+		if((v & 0x20) != 0 && thechar == 'i')
+			break;
+		a = (o->as == ASRA) << 10;
+		if(r == p->to.reg && COMPREG(r) && v != 0 && (v & ~0x3F) == 0)
+			return COP_CI(0x8001 | a, r&0x7, v);
+		break;
+	case 10: /* C.ADDI C.ADDI16SP C.ADDI4SPN C.NOP */
+		v = p->from.offset;
+		if(r == p->to.reg && r != REGZERO && v != 0 && v >= -0x20 && v < 0x20)
+			return COP_CI(0x0001, p->to.reg, v);
+		if(r == p->to.reg && r == REGSP && v != 0 && (v&0xF) == 0 && v >= -0x200 && v < 0x200)
+			return COP_CI(0x6001, REGSP, immbits(v, "\5\7\10\6\4\11"));
+		if(r == REGSP && COMPREG(p->to.reg) && (v&0x3) == 0 && v > 0 && v < 0x400)
+			return COP_CIW(0x0000, p->to.reg&0x7, immbits(v, "\3\2\6\7\10\11\4\5"));
+		if(r == p->to.reg && r == REGZERO && v == 0)
+			return COP_CI(0x0001, 0, 0);
+		break;
+	case 11: /* C.JAL (rv32) */
+		if(thechar != 'i')
+			break;
+		if(r == REGLINK)
+			return asmcjmp(0x2001, p, first);
+		break;
+	case 12: /* C.J */
+		return asmcjmp(0xA001, p, first);
+		break;
+	case 13: /* C.ANDI */
+		v = p->from.offset;
+		if(r == p->to.reg && COMPREG(r) && v >= -0x20 && v < 0x20)
+			return COP_CI(0x8801, r&0x7, v);
+		break;
+	case 14: /* C.BEQZ */
+		return asmcbz(0xC001, p, first);
+	case 15: /* C.BNEZ */
+		return asmcbz(0xE001, p, first);
+	case 16: /* C.LW C.LWSP */
+		return asmcload(p, 0x4000, 4, 0x80);
+	case 17: /* C.FLW, C.FLWSP (rv32) */
+		if(thechar != 'i')
+			break;
+		return asmcload(p, 0x6000, 4, 0x80);
+	case 18: /* C.FLD, C.FLDSP */
+		return asmcload(p, 0x2000, 8, 0x100);
+	case 19: /* C.SW C.SWSP */
+		return asmcstore(p, 0xC000, 4, 0x80);
+	case 20: /* C.FSW, C.FSWSP (rv32) */
+		if(thechar != 'i')
+			break;
+		return asmcstore(p, 0xE000, 4, 0x80);
+	case 21: /* C.FSD, C.FSDSP */
+		return asmcstore(p, 0xA000, 8, 0x100);
+	case 22: /* C.ADDW C.SUBW (rv64) */
+		if(thechar != 'j')
+			break;
+		if(r == p->to.reg && COMPREG(p->from.reg) && COMPREG(p->to.reg)){
+			v = 0x9C01;
+			switch(o->as){
+			case AADDW:
+				v |= 1<<5;
+				break;
+			}
+			return COP_CR(v, p->from.reg&0x7, p->to.reg&0x7);
+		}
+		break;
+	case 23: /* C.ADDIW (rv64) */
+		if(thechar != 'j')
+			break;
+		v = p->from.offset;
+		if(p->as == AMOVW){
+			v = 0;
+			r = p->from.reg;
+		}
+		if(r == p->to.reg && r != REGZERO && v >= -0x20 && v < 0x20)
+			return COP_CI(0x2001, p->to.reg, v);
+		break;
+	case 24: /* C.LD (rv64) */
+		if(thechar != 'j')
+			break;
+		return asmcload(p, 0x6000, 8, 0x100);
+	case 25: /* C.SD (rv64) */
+		if(thechar != 'j')
+			break;
+		return asmcstore(p, 0xE000, 8, 0x100);
+	}
+	return 0;
+}
--- /dev/null
+++ b/sys/src/cmd/jl/l.h
@@ -1,0 +1,359 @@
+#include	<u.h>
+#include	<libc.h>
+#include	<bio.h>
+#include	"../jc/j.out.h"
+
+#ifndef	EXTERN
+#define	EXTERN	extern
+#endif
+
+typedef vlong xlong;
+
+typedef	struct	Adr	Adr;
+typedef	struct	Sym	Sym;
+typedef	struct	Autom	Auto;
+typedef	struct	Prog	Prog;
+typedef	struct	Optab	Optab;
+typedef	struct	Oprang	Oprang;
+typedef	uchar	Opcross[32][32];
+typedef	struct	Count	Count;
+
+#define	P		((Prog*)0)
+#define	S		((Sym*)0)
+#define	TNAME		(curtext&&curtext->from.sym?curtext->from.sym->name:noname)
+
+struct	Adr
+{
+	union
+	{
+		long	u0offset;
+		char*	u0sval;
+		Ieee*	u0ieee;
+		vlong*	u0vval;
+	} u0;
+	union
+	{
+		Auto*	u1autom;
+		Sym*	u1sym;
+	} u1;
+	char	type;
+	char	reg;
+	char	name;
+	char	class;
+};
+
+#define	offset	u0.u0offset
+#define	sval	u0.u0sval
+#define	ieee	u0.u0ieee
+#define	vval	u0.u0vval
+
+#define	autom	u1.u1autom
+#define	sym	u1.u1sym
+
+struct	Prog
+{
+	Adr	from;
+	Adr	to;
+	union
+	{
+		long	u0regused;
+		Prog*	u0forwd;
+	} u0;
+	Prog*	cond;
+	Prog*	link;
+	long	pc;
+	long	line;
+	uchar	mark;
+	uchar	optab;
+	char	as;
+	char	reg;
+};
+#define	regused	u0.u0regused
+#define	forwd	u0.u0forwd
+
+struct	Sym
+{
+	char	*name;
+	short	type;
+	short	version;
+	short	become;
+	short	frame;
+	ushort	file;
+	long	value;
+	long	sig;
+	Sym*	link;
+};
+struct	Autom
+{
+	Sym*	asym;
+	Auto*	link;
+	long	aoffset;
+	short	type;
+};
+struct	Optab
+{
+	char	as;
+	char	a1;
+	char	a3;
+	char	type;
+	char	ctype;
+	char	size;
+	char	op;
+	char	func3;
+	short	param;
+};
+struct	Oprang
+{
+	Optab*	start;
+	Optab*	stop;
+};
+struct	Count
+{
+	long	count;
+	long	outof;
+};
+
+enum
+{
+	STEXT		= 1,
+	SDATA,
+	SBSS,
+	SDATA1,
+	SXREF,
+	SLEAF,
+	SFILE,
+	SCONST,
+	SSTRING,
+
+	C_NONE		= 0,
+	C_REG,
+	C_CTLREG,
+	C_FREG,
+	C_ZREG,
+	C_ZCON,
+	C_SCON,
+	C_UCON,
+	C_LCON,
+	C_VCON,
+	C_FCON,
+	C_SACON,
+	C_SECON,
+	C_LACON,
+	C_LECON,
+	C_SRCON,
+	C_LRCON,
+	C_SBRA,
+	C_LBRA,
+	C_SAUTO,
+	C_ZOREG,
+	C_SOREG,
+	C_LOREG,
+	C_LAUTO,
+	C_SEXT,
+	C_LEXT,
+	C_GOK,
+
+	NSCHED		= 20,
+
+/* mark flags */
+	FOLL		= 1<<0,
+	LABEL		= 1<<1,
+	LEAF		= 1<<2,
+	SYNC		= 1<<3,
+	BRANCH		= 1<<4,
+	COMPR		= 1<<5,
+	SPASS		= 1<<6,
+
+	BIG		= 2048,
+	STRINGSZ	= 200,
+	NHASH		= 10007,
+	NHUNK		= 100000,
+	MINSIZ		= 64,
+	NENT		= 100,
+	MAXIO		= (16*1024),
+	MAXHIST		= 20,				/* limit of path elements for history symbols */
+};
+
+/* Major opcodes */
+enum {
+	OLOAD,	 OLOAD_FP,  Ocustom_0,	OMISC_MEM, OOP_IMM, OAUIPC, OOP_IMM_32,	O48b,
+	OSTORE,	 OSTORE_FP, Ocustom_1,	OAMO,	   OOP,	    OLUI,   OOP_32,	O64b,
+	OMADD,	 OMSUB,	    ONMSUB,	ONMADD,	   OOP_FP,  Ores_0, Ocustom_2,	O48b_2,
+	OBRANCH, OJALR,	    Ores_1,	OJAL,	   OSYSTEM, Ores_2, Ocustom_3,	O80b
+};
+
+EXTERN union
+{
+	struct
+	{
+		uchar	obuf[MAXIO];			/* output buffer */
+		uchar	ibuf[MAXIO];			/* input buffer */
+	} u;
+	char	dbuf[1];
+} buf;
+
+#define	cbuf	u.obuf
+#define	xbuf	u.ibuf
+
+EXTERN	long	HEADR;			/* length of header */
+EXTERN	int	HEADTYPE;		/* type of header */
+EXTERN	xlong	INITDAT;		/* data location */
+EXTERN	xlong	INITRND;		/* data round above text location */
+EXTERN	xlong	INITTEXT;		/* text location */
+EXTERN	xlong	INITTEXTP;		/* text location (physical) */
+EXTERN	char*	INITENTRY;		/* entry point */
+EXTERN	long	autosize;
+EXTERN	Biobuf	bso;
+EXTERN	long	bsssize;
+EXTERN	int	cbc;
+EXTERN	uchar*	cbp;
+EXTERN	int	cout;
+EXTERN	Auto*	curauto;
+EXTERN	Auto*	curhist;
+EXTERN	Prog*	curp;
+EXTERN	Prog*	curtext;
+EXTERN	Prog*	datap;
+EXTERN	long	datsize;
+EXTERN	char	debug[128];
+EXTERN	Prog*	etextp;
+EXTERN	Prog*	firstp;
+EXTERN	char	fnuxi4[4];	/* for 3l [sic] */
+EXTERN	char	fnuxi8[8];
+EXTERN	char*	noname;
+EXTERN	Sym*	hash[NHASH];
+EXTERN	Sym*	histfrog[MAXHIST];
+EXTERN	int	histfrogp;
+EXTERN	int	histgen;
+EXTERN	char*	library[50];
+EXTERN	char*	libraryobj[50];
+EXTERN	int	libraryp;
+EXTERN	int	xrefresolv;
+EXTERN	char*	hunk;		/* compat.c's malloc */
+EXTERN	char	inuxi1[1];
+EXTERN	char	inuxi2[2];
+EXTERN	char	inuxi4[4];
+EXTERN	char	inuxi8[8];
+EXTERN	Prog*	lastp;
+EXTERN	long	lcsize;
+EXTERN	char	literal[32];
+EXTERN	int	nerrors;
+EXTERN	long	nhunk;		/* compat.c's malloc */
+EXTERN	Prog	nopalign;
+EXTERN	long	instoffset;
+EXTERN	vlong	instoffx;
+EXTERN	Opcross	opcross[10];
+EXTERN	Oprang	oprange[ALAST];
+EXTERN	char*	outfile;
+EXTERN	long	pc;
+EXTERN	int	ptrsize;
+EXTERN	uchar	repop[ALAST];
+EXTERN	long	symsize;
+EXTERN	Prog*	textp;
+EXTERN	long	textsize;
+EXTERN	long	thunk;		/* compat.c's malloc */
+EXTERN	int	version;
+EXTERN	char	xcmp[32][32];
+EXTERN	Prog	zprg;
+EXTERN	int	dtype;
+EXTERN	int	little;
+
+EXTERN	struct
+{
+	Count	branch;
+	Count	fcmp;
+	Count	load;
+	Count	mfrom;
+	Count	page;
+	Count	jump;
+} nop;
+
+extern	char*	anames[];
+extern	Optab	optab[];
+extern	char	thechar;
+
+#pragma	varargck	type	"A"	int
+#pragma	varargck	type	"D"	Adr*
+#pragma	varargck	type	"N"	Adr*
+#pragma	varargck	type	"P"	Prog*
+#pragma	varargck	type	"S"	char*
+
+#pragma	varargck	argpos	diag 1
+
+int	Aconv(Fmt*);
+int	Dconv(Fmt*);
+int	Nconv(Fmt*);
+int	Pconv(Fmt*);
+int	Sconv(Fmt*);
+int	aclass(Adr*);
+void	addhist(long, int);
+void	append(Prog*, Prog*);
+void	asmb(void);
+int	asmcompressed(Prog*, Optab*, int, int);
+void	asmlc(void);
+int	asmout(Prog*, Optab*, int);
+void	asmsym(void);
+vlong	atolwhex(char*);
+Prog*	brloop(Prog*);
+void	buildop(void);
+void	buildrep(int, int);
+void	cflush(void);
+int	cmp(int, int);
+int	compound(Prog*);
+double	cputime(void);
+void	datblk(long, long, int);
+void	diag(char*, ...);
+void	dodata(void);
+void	doprof1(void);
+void	doprof2(void);
+vlong	entryvalue(void);
+void	errorexit(void);
+void	exchange(Prog*);
+int	find1(long, int);
+void	follow(void);
+void	gethunk(void);
+void	histtoauto(void);
+double	ieeedtod(Ieee*);
+long	ieeedtof(Ieee*);
+int	isnop(Prog*);
+void	ldobj(int, long, char*);
+void	loadlib(void);
+void	listinit(void);
+Sym*	lookup(char*, int);
+void	cput(int);
+void	llput(vlong);
+void	llputl(vlong);
+void	lput(long);
+void	lputl(long);
+void	bput(long);
+void	mkfwd(void);
+#define	mysbrk sbrk
+void	names(void);
+void	nocache(Prog*);
+void	noops(void);
+void	nuxiinit(void);
+void	objfile(char*);
+int	ocmp(void*, void*);
+long	opirr(int);
+Optab*	oplook(Prog*);
+long	oprrr(int);
+void	patch(void);
+void	prasm(Prog*);
+void	prepend(Prog*, Prog*);
+Prog*	prg(void);
+int	pseudo(Prog*);
+void	putsymb(char*, int, vlong, int);
+long	regoff(Adr*);
+int		classreg(Adr*);
+int	relinv(int);
+int relrev(int);
+vlong	rnd(vlong, vlong);
+void	span(void);
+void	strnput(char*, int);
+void	undef(void);
+int	vconshift(vlong);
+void	wput(long);
+void	wputl(long);
+void	xdefine(char*, int, long);
+void	xfol(Prog*);
+void	xfol(Prog*);
+void	nopstat(char*, Count*);
--- /dev/null
+++ b/sys/src/cmd/jl/list.c
@@ -1,0 +1,252 @@
+#include "l.h"
+
+void
+listinit(void)
+{
+
+	fmtinstall('A', Aconv);
+	fmtinstall('D', Dconv);
+	fmtinstall('P', Pconv);
+	fmtinstall('S', Sconv);
+	fmtinstall('N', Nconv);
+}
+
+void
+prasm(Prog *p)
+{
+	print("%P\n", p);
+}
+
+int
+Pconv(Fmt *fp)
+{
+	char str[STRINGSZ], *s;
+	Prog *p;
+	int a;
+
+	p = va_arg(fp->args, Prog*);
+	curp = p;
+	a = p->as;
+	if(a == ADATA || a == ADYNT || a == AINIT)
+		sprint(str, "(%ld)	%A	%D/%d,%D",
+			p->line, a, &p->from, p->reg, &p->to);
+	else{
+		s = str;
+		s += sprint(s, "(%ld)", p->line);
+		if(p->reg == NREG)
+			sprint(s, "	%A	%D,%D",
+				a, &p->from, &p->to);
+		else
+		if(p->from.type != D_FREG)
+			sprint(s, "	%A	%D,R%d,%D",
+				a, &p->from, p->reg, &p->to);
+		else
+			sprint(s, "	%A	%D,F%d,%D",
+				a, &p->from, p->reg, &p->to);
+	}
+	return fmtstrcpy(fp, str);
+}
+
+int
+Aconv(Fmt *fp)
+{
+	char *s;
+	int a;
+
+	a = va_arg(fp->args, int);
+	s = "???";
+	if(a >= AXXX && a < ALAST)
+		s = anames[a];
+	return fmtstrcpy(fp, s);
+}
+
+int
+Dconv(Fmt *fp)
+{
+	char str[STRINGSZ];
+	Adr *a;
+	long v;
+
+	a = va_arg(fp->args, Adr*);
+	switch(a->type) {
+
+	default:
+		sprint(str, "GOK-type(%d)", a->type);
+		break;
+
+	case D_NONE:
+		str[0] = 0;
+		if(a->name != D_NONE || a->reg != NREG || a->sym != S)
+			sprint(str, "%N(R%d)(NONE)", a, a->reg);
+		break;
+
+	case D_CONST:
+		if(a->reg == NREG)
+			sprint(str, "$%N", a);
+		else
+			sprint(str, "$%N(R%d)", a, a->reg);
+		break;
+
+	case D_VCONST:
+		sprint(str, "$%lld", *a->vval);
+		break;
+
+	case D_OREG:
+		if(a->reg != NREG)
+			sprint(str, "%N(R%d)", a, a->reg);
+		else
+			sprint(str, "%N", a);
+		break;
+
+	case D_REG:
+		sprint(str, "R%d", a->reg);
+		if(a->name != D_NONE || a->sym != S)
+			sprint(str, "%N(R%d)(REG)", a, a->reg);
+		break;
+
+	case D_FREG:
+		sprint(str, "F%d", a->reg);
+		if(a->name != D_NONE || a->sym != S)
+			sprint(str, "%N(R%d)(REG)", a, a->reg);
+		break;
+
+	case D_CTLREG:
+		sprint(str, "CSR(0x%lx)", a->offset);
+		break;
+
+	case D_BRANCH:	/* botch */
+		if(curp->cond != P) {
+			v = curp->cond->pc + INITTEXT;
+			if(a->sym != S)
+				sprint(str, "%s+%.5lux(BRANCH)", a->sym->name, v);
+			else
+				sprint(str, "%.5lux(BRANCH)", v);
+		} else
+			if(a->sym != S)
+				sprint(str, "%s+%ld(APC)", a->sym->name, a->offset);
+			else
+				sprint(str, "%ld(APC)", a->offset);
+		break;
+
+	case D_FCONST:
+		sprint(str, "$%e", ieeedtod(a->ieee));
+		break;
+
+	case D_SCONST:
+		sprint(str, "$\"%S\"", a->sval);
+		break;
+	}
+	return fmtstrcpy(fp, str);
+}
+
+int
+Nconv(Fmt *fp)
+{
+	char str[STRINGSZ];
+	Adr *a;
+	Sym *s;
+
+	a = va_arg(fp->args, Adr*);
+	s = a->sym;
+	switch(a->name) {
+	default:
+		sprint(str, "GOK-name(%d)", a->name);
+		break;
+
+	case D_NONE:
+		sprint(str, "%ld", a->offset);
+		break;
+
+	case D_EXTERN:
+		if(s == S)
+			sprint(str, "%ld(SB)", a->offset);
+		else
+			sprint(str, "%s+%ld(SB)", s->name, a->offset);
+		break;
+
+	case D_STATIC:
+		if(s == S)
+			sprint(str, "<>+%ld(SB)", a->offset);
+		else
+			sprint(str, "%s<>+%ld(SB)", s->name, a->offset);
+		break;
+
+	case D_AUTO:
+		if(s == S)
+			sprint(str, "%ld(SP)", a->offset);
+		else
+			sprint(str, "%s-%ld(SP)", s->name, -a->offset);
+		break;
+
+	case D_PARAM:
+		if(s == S)
+			sprint(str, "%ld(FP)", a->offset);
+		else
+			sprint(str, "%s+%ld(FP)", s->name, a->offset);
+		break;
+	}
+
+	return fmtstrcpy(fp, str);
+}
+
+int
+Sconv(Fmt *fp)
+{
+	int i, c;
+	char str[STRINGSZ], *p, *a;
+
+	a = va_arg(fp->args, char*);
+	p = str;
+	for(i=0; i<sizeof(long); i++) {
+		c = a[i] & 0xff;
+		if(c >= 'a' && c <= 'z' ||
+		   c >= 'A' && c <= 'Z' ||
+		   c >= '0' && c <= '9' ||
+		   c == ' ' || c == '%') {
+			*p++ = c;
+			continue;
+		}
+		*p++ = '\\';
+		switch(c) {
+		case 0:
+			*p++ = 'z';
+			continue;
+		case '\\':
+		case '"':
+			*p++ = c;
+			continue;
+		case '\n':
+			*p++ = 'n';
+			continue;
+		case '\t':
+			*p++ = 't';
+			continue;
+		}
+		*p++ = (c>>6) + '0';
+		*p++ = ((c>>3) & 7) + '0';
+		*p++ = (c & 7) + '0';
+	}
+	*p = 0;
+	return fmtstrcpy(fp, str);
+}
+
+void
+diag(char *fmt, ...)
+{
+	char buf[STRINGSZ], *tn;
+	va_list arg;
+
+	tn = "??none??";
+	if(curtext != P && curtext->from.sym != S)
+		tn = curtext->from.sym->name;
+	va_start(arg, fmt);
+	vseprint(buf, buf+sizeof(buf), fmt, arg);
+	va_end(arg);
+	print("%s: %s\n", tn, buf);
+
+	nerrors++;
+	if(nerrors > 10) {
+		print("too many errors\n");
+		errorexit();
+	}
+}
--- /dev/null
+++ b/sys/src/cmd/jl/mkfile
@@ -1,0 +1,26 @@
+</$objtype/mkfile
+
+TARG=jl
+
+OFILES=\
+	asm.$O\
+	compress.$O\
+	list.$O\
+	noop.$O\
+	obj.$O\
+	optab.$O\
+	pass.$O\
+	span.$O\
+	enam.$O\
+	compat.$O\
+
+HFILES=\
+	l.h\
+	../jc/j.out.h\
+
+BIN=/$objtype/bin
+CFLAGS=$CFLAGS -. -I.
+</sys/src/cmd/mkone
+
+enam.$O:	../jc/enam.c
+	$CC $CFLAGS ../jc/enam.c
--- /dev/null
+++ b/sys/src/cmd/jl/noop.c
@@ -1,0 +1,341 @@
+#include	"l.h"
+
+void
+noops(void)
+{
+	Prog *p, *q, *q1;
+	int o, curframe, curbecome, maxbecome;
+
+	/*
+	 * find leaf subroutines
+	 * become sizes
+	 * frame sizes
+	 * strip NOPs
+	 * expand RET
+	 * expand BECOME pseudo
+	 */
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f noops\n", cputime());
+	Bflush(&bso);
+
+	curframe = 0;
+	curbecome = 0;
+	maxbecome = 0;
+	curtext = 0;
+
+	q = P;
+	for(p = firstp; p != P; p = p->link) {
+
+		/* find out how much arg space is used in this TEXT */
+		if(p->to.type == D_OREG && p->to.reg == REGSP)
+			if(p->to.offset > curframe)
+				curframe = p->to.offset;
+
+		switch(p->as) {
+		case ATEXT:
+			if(curtext && curtext->from.sym) {
+				curtext->from.sym->frame = curframe;
+				curtext->from.sym->become = curbecome;
+				if(curbecome > maxbecome)
+					maxbecome = curbecome;
+			}
+			curframe = 0;
+			curbecome = 0;
+
+			p->mark |= LABEL|LEAF|SYNC;
+			if(p->link)
+				p->link->mark |= LABEL;
+			curtext = p;
+			break;
+
+		/* too hard, just leave alone */
+		case AMOVW:
+		case AMOV:
+			if(p->to.type == D_CTLREG) {
+				p->mark |= LABEL|SYNC;
+				break;
+			}
+			if(p->from.type == D_CTLREG) {
+				p->mark |= LABEL|SYNC;
+				break;
+			}
+			break;
+
+		/* too hard, just leave alone */
+		case ASYS:
+		case AWORD:
+			p->mark |= LABEL|SYNC;
+			break;
+
+		case ARET:
+			/* special form of RET is BECOME */
+			if(p->from.type == D_CONST)
+				if(p->from.offset > curbecome)
+					curbecome = p->from.offset;
+
+			if(p->link != P)
+				p->link->mark |= LABEL;
+			break;
+
+		case ANOP:
+			q1 = p->link;
+			q->link = q1;		/* q is non-nop */
+			q1->mark |= p->mark;
+			continue;
+
+		case AJAL:
+			if(curtext != P)
+				curtext->mark &= ~LEAF;
+
+		case AJMP:
+		case ABEQ:
+		case ABGE:
+		case ABGEU:
+		case ABLT:
+		case ABLTU:
+		case ABNE:
+			p->mark |= BRANCH;
+
+			q1 = p->cond;
+			if(q1 != P) {
+				while(q1->as == ANOP) {
+					q1 = q1->link;
+					p->cond = q1;
+				}
+				if(!(q1->mark & LEAF))
+					q1->mark |= LABEL;
+			} else
+				p->mark |= LABEL;
+			q1 = p->link;
+			if(q1 != P)
+				q1->mark |= LABEL;
+			break;
+		}
+		q = p;
+	}
+
+	if(curtext && curtext->from.sym) {
+		curtext->from.sym->frame = curframe;
+		curtext->from.sym->become = curbecome;
+		if(curbecome > maxbecome)
+			maxbecome = curbecome;
+	}
+
+	if(debug['b'])
+		print("max become = %d\n", maxbecome);
+	xdefine("ALEFbecome", STEXT, maxbecome);
+
+	curtext = 0;
+	for(p = firstp; p != P; p = p->link) {
+		switch(p->as) {
+		case ATEXT:
+			curtext = p;
+			break;
+		case AJAL:
+			if(curtext != P && curtext->from.sym != S && curtext->to.offset >= 0) {
+				o = maxbecome - curtext->from.sym->frame;
+				if(o <= 0)
+					break;
+				/* calling a become or calling a variable */
+				if(p->to.sym == S || p->to.sym->become) {
+					curtext->to.offset += o;
+					if(debug['b']) {
+						curp = p;
+						print("%D calling %D increase %d\n",
+							&curtext->from, &p->to, o);
+					}
+				}
+			}
+			break;
+		}
+	}
+
+	for(p = firstp; p != P; p = p->link) {
+		o = p->as;
+		switch(o) {
+		case ATEXT:
+			curtext = p;
+			autosize = p->to.offset + ptrsize;
+			if(autosize <= ptrsize) {
+				if(curtext->mark & LEAF || autosize <= 0) {
+					p->to.offset = -ptrsize;
+					autosize = 0;
+				} else if(ptrsize == 4) {
+					p->to.offset = 4;
+					autosize = 8;
+				}
+			}
+
+			q = p;
+			if(autosize) {
+				q = prg();
+				q->as = AADD;
+				q->line = p->line;
+				q->from.type = D_CONST;
+				q->from.offset = -autosize;
+				q->to.type = D_REG;
+				q->to.reg = REGSP;
+
+				q->link = p->link;
+				p->link = q;
+			} else
+			if(!(curtext->mark & LEAF)) {
+				if(debug['v'])
+					Bprint(&bso, "save suppressed in: %s\n",
+						curtext->from.sym->name);
+				Bflush(&bso);
+				curtext->mark |= LEAF;
+			}
+
+			if(curtext->mark & LEAF) {
+				if(curtext->from.sym)
+					curtext->from.sym->type = SLEAF;
+				break;
+			}
+
+			q1 = prg();
+			q1->as = thechar == 'j' ? AMOV : AMOVW;
+			q1->line = p->line;
+			q1->from.type = D_REG;
+			q1->from.reg = REGLINK;
+			q1->to.type = D_OREG;
+			q1->from.offset = 0;
+			q1->to.reg = REGSP;
+
+			q1->link = q->link;
+			q->link = q1;
+			break;
+
+		case ARET:
+			nocache(p);
+			if(p->from.type == D_CONST)
+				goto become;
+			if(curtext->mark & LEAF) {
+				if(!autosize) {
+					p->as = AJMP;
+					p->from = zprg.from;
+					p->to.type = D_OREG;
+					p->to.offset = 0;
+					p->to.reg = REGLINK;
+					p->mark |= BRANCH;
+					break;
+				}
+
+				p->as = AADD;
+				p->from.type = D_CONST;
+				p->from.offset = autosize;
+				p->to.type = D_REG;
+				p->to.reg = REGSP;
+
+				q = prg();
+				q->as = AJMP;
+				q->line = p->line;
+				q->to.type = D_OREG;
+				q->to.offset = 0;
+				q->to.reg = REGLINK;
+				q->mark |= BRANCH;
+
+				q->link = p->link;
+				p->link = q;
+				break;
+			}
+			p->as = thechar == 'j' ? AMOV : AMOVW;
+			p->from.type = D_OREG;
+			p->from.offset = 0;
+			p->from.reg = REGSP;
+			p->to.type = D_REG;
+			p->to.reg = REGLINK;
+
+			q = p;
+			if(autosize) {
+				q = prg();
+				q->as = AADD;
+				q->line = p->line;
+				q->from.type = D_CONST;
+				q->from.offset = autosize;
+				q->to.type = D_REG;
+				q->to.reg = REGSP;
+
+				q->link = p->link;
+				p->link = q;
+			}
+
+			q1 = prg();
+			q1->as = AJMP;
+			q1->line = p->line;
+			q1->to.type = D_OREG;
+			q1->to.offset = 0;
+			q1->to.reg = REGLINK;
+			q1->mark |= BRANCH;
+
+			q1->link = q->link;
+			q->link = q1;
+			break;
+
+		become:
+			if(curtext->mark & LEAF) {
+
+				q = prg();
+				q->line = p->line;
+				q->as = AJMP;
+				q->from = zprg.from;
+				q->to = p->to;
+				q->cond = p->cond;
+				q->link = p->link;
+				q->mark |= BRANCH;
+				p->link = q;
+
+				p->as = AADD;
+				p->from = zprg.from;
+				p->from.type = D_CONST;
+				p->from.offset = autosize;
+				p->to = zprg.to;
+				p->to.type = D_REG;
+				p->to.reg = REGSP;
+
+				break;
+			}
+			q = prg();
+			q->line = p->line;
+			q->as = AJMP;
+			q->from = zprg.from;
+			q->to = p->to;
+			q->cond = p->cond;
+			q->link = p->link;
+			q->mark |= BRANCH;
+			p->link = q;
+
+			q = prg();
+			q->line = p->line;
+			q->as = AADD;
+			q->from.type = D_CONST;
+			q->from.offset = autosize;
+			q->to.type = D_REG;
+			q->to.reg = REGSP;
+			q->link = p->link;
+			p->link = q;
+
+			p->as = thechar == 'j' ? AMOV : AMOVW;
+			p->from = zprg.from;
+			p->from.type = D_OREG;
+			p->from.offset = 0;
+			p->from.reg = REGSP;
+			p->to = zprg.to;
+			p->to.type = D_REG;
+			p->to.reg = REGLINK;
+
+			break;
+		}
+	}
+
+	curtext = P;
+}
+
+void
+nocache(Prog *p)
+{
+	p->optab = 0;
+	p->from.class = 0;
+	p->to.class = 0;
+}
--- /dev/null
+++ b/sys/src/cmd/jl/obj.c
@@ -1,0 +1,1536 @@
+#define	EXTERN
+#include	"l.h"
+#include	<ar.h>
+
+#ifndef	DEFAULT
+#define	DEFAULT	'9'
+#endif
+
+char	*noname		= "<none>";
+char	symname[]	= SYMDEF;
+char	thechar		= 'i';
+char	*thestring 	= "riscv";
+
+/*
+ *	-H1 -R4				is headerless (-R8 for jl)
+ *	-H2 -T4128 -R4096		is plan9 format
+ *	-H5 -T4128 -R4			is elf executable (-R8 for jl)
+ */
+
+int little;
+
+static int
+isundef(char *symb)
+{
+	int h;
+	Sym *s;
+
+	for(h=0; h<nelem(hash); h++)
+		for(s = hash[h]; s != S; s = s->link)
+			if(strcmp(s->name, symb) == 0)
+				return 1;
+	return 0;
+}
+
+void
+main(int argc, char *argv[])
+{
+	int c;
+	char *a;
+
+	Binit(&bso, 1, OWRITE);
+	cout = -1;
+	listinit();
+	outfile = 0;
+	nerrors = 0;
+	curtext = P;
+	HEADTYPE = -1;
+	INITTEXT = -1;
+	INITTEXTP = -1;
+	INITDAT = -1;
+	INITRND = -1;
+	INITENTRY = 0;
+	ptrsize = 4;
+
+	a = strrchr(argv[0], '/');
+	if(a == nil)
+		a = argv[0];
+	else
+		a++;
+	if(*a == 'j')
+		thechar = 'j';
+	ARGBEGIN {
+	default:
+		c = ARGC();
+		if(c >= 0 && c < sizeof(debug))
+			debug[c]++;
+		break;
+	case 'o':
+		outfile = ARGF();
+		break;
+	case 'E':
+		a = ARGF();
+		if(a)
+			INITENTRY = a;
+		break;
+	case 'T':
+		a = ARGF();
+		if(a)
+			INITTEXT = atolwhex(a);
+		break;
+	case 'P':
+		a = ARGF();
+		if(a)
+			INITTEXTP = atolwhex(a);
+		break;
+	case 'D':
+		a = ARGF();
+		if(a)
+			INITDAT = atolwhex(a);
+		break;
+	case 'R':
+		a = ARGF();
+		if(a)
+			INITRND = atolwhex(a);
+		break;
+	case 'H':
+		a = ARGF();
+		if(a)
+			HEADTYPE = atolwhex(a);
+		break;
+	} ARGEND
+
+	USED(argc);
+
+	if(*argv == 0) {
+		diag("usage: %cl [-options] objects", thechar);
+		errorexit();
+	}
+	if(debug['j'])
+		thechar = 'j';
+	if(thechar == 'j'){
+		thestring = "riscv64";
+		ptrsize = 8;
+	}
+	if(!debug['9'] && !debug['U'] && !debug['B'])
+		debug[DEFAULT] = 1;
+	if(HEADTYPE == -1) {
+		if(debug['U'])
+			HEADTYPE = 5;
+		if(debug['B'])
+			HEADTYPE = 1;
+		if(debug['9'])
+			HEADTYPE = 2;
+	}
+	switch(HEADTYPE) {
+	default:
+		diag("unknown -H option");
+		errorexit();
+
+	case 1:	/* headerless */
+		HEADR = 0;
+		if(INITTEXT == -1)
+			INITTEXT = 0;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 8;
+		break;
+	case 2:	/* plan 9 */
+		HEADR = 32L;
+		if (thechar == 'j' && debug['X'])
+			HEADR += sizeof(vlong);	/* for virtual entry addr. */
+		if(INITTEXT == -1)
+			INITTEXT = 4096 + HEADR;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 4096;
+		break;
+ 	case 5:	/* elf executable */
+		HEADR = rnd(52L+3*32L, 16);
+		if(INITTEXT == -1)
+			INITTEXT = 0;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 8;
+		break;
+	}
+	if (INITTEXTP == -1)
+		INITTEXTP = INITTEXT;
+	if(INITDAT != 0 && INITRND != 0)
+		print("warning: -D0x%llux is ignored because of -R0x%llux\n",
+			INITDAT, INITRND);
+	if(debug['v'])
+		Bprint(&bso, "HEADER = -H0x%d -T0x%llux -D0x%llux -R0x%llux\n",
+			HEADTYPE, INITTEXT, INITDAT, INITRND);
+	Bflush(&bso);
+	zprg.as = AGOK;
+	zprg.reg = NREG;
+	zprg.from.name = D_NONE;
+	zprg.from.type = D_NONE;
+	zprg.from.reg = NREG;
+	zprg.to = zprg.from;
+	nopalign = zprg;
+	nopalign.as = AADD;
+	nopalign.from.type = D_CONST;
+	nopalign.to.type = D_REG;
+	nopalign.to.reg = REGZERO;
+	nopalign.reg = REGZERO;
+	buildop();
+	histgen = 0;
+	textp = P;
+	datap = P;
+	pc = 0;
+	dtype = 4;
+	if(outfile == 0) {
+		static char name[20];
+
+		snprint(name, sizeof name, "%c.out", thechar);
+		outfile = name;
+	}
+	cout = create(outfile, 1, 0775);
+	if(cout < 0) {
+		diag("%s: cannot create", outfile);
+		errorexit();
+	}
+	nuxiinit();
+
+	version = 0;
+	cbp = buf.cbuf;
+	cbc = sizeof(buf.cbuf);
+	firstp = prg();
+	lastp = firstp;
+
+	if(INITENTRY == 0) {
+		INITENTRY = "_main";
+		if(debug['p'])
+			INITENTRY = "_mainp";
+		if(!debug['l'])
+			lookup(INITENTRY, 0)->type = SXREF;
+	} else
+		lookup(INITENTRY, 0)->type = SXREF;
+
+	while(*argv)
+		objfile(*argv++);
+	if(!debug['l']) {
+		loadlib();
+		if (0 && !isundef("_fltused"))	/* TODO: no fp use? */
+			objfile("-lnofp");
+	}
+	firstp = firstp->link;
+	if(firstp == P)
+		goto out;
+	patch();
+	if(debug['p'])
+		if(debug['1'])
+			doprof1();
+		else
+			doprof2();
+	dodata();
+	follow();
+	if(firstp == P)
+		goto out;
+	noops();
+	span();
+	asmb();
+	undef();
+
+out:
+	if(debug['v']) {
+		Bprint(&bso, "%5.2f cpu time\n", cputime());
+		Bprint(&bso, "%ld memory used\n", thunk);
+		Bprint(&bso, "%lld sizeof adr\n", (vlong)sizeof(Adr));
+		Bprint(&bso, "%lld sizeof prog\n", (vlong)sizeof(Prog));
+	}
+	Bflush(&bso);
+	errorexit();
+}
+
+void
+loadlib(void)
+{
+	int i;
+	long h;
+	Sym *s;
+
+loop:
+	xrefresolv = 0;
+	for(i=0; i<libraryp; i++) {
+		if(debug['v'])
+			Bprint(&bso, "%5.2f autolib: %s (from %s)\n", cputime(), library[i], libraryobj[i]);
+		objfile(library[i]);
+	}
+	if(xrefresolv)
+	for(h=0; h<nelem(hash); h++)
+	for(s = hash[h]; s != S; s = s->link)
+		if(s->type == SXREF)
+			goto loop;
+}
+
+void
+errorexit(void)
+{
+
+	if(nerrors) {
+		if(cout >= 0)
+			remove(outfile);
+		exits("error");
+	}
+	exits(0);
+}
+
+void
+objfile(char *file)
+{
+	long off, esym, cnt, l;
+	int f, work;
+	Sym *s;
+	char magbuf[SARMAG];
+	char name[100], pname[150];
+	struct ar_hdr arhdr;
+	char *e, *start, *stop;
+
+	if(file[0] == '-' && file[1] == 'l') {
+		if(debug['9'])
+			sprint(name, "/%s/lib/lib", thestring);
+		else
+			sprint(name, "/usr/%clib/lib", thechar);
+		strcat(name, file+2);
+		strcat(name, ".a");
+		file = name;
+	}
+	if(debug['v'])
+		Bprint(&bso, "%5.2f ldobj: %s\n", cputime(), file);
+	Bflush(&bso);
+	f = open(file, 0);
+	if(f < 0) {
+		diag("cannot open file: %s", file);
+		errorexit();
+	}
+	l = read(f, magbuf, SARMAG);
+	if(l != SARMAG || strncmp(magbuf, ARMAG, SARMAG)){
+		/* load it as a regular file */
+		l = seek(f, 0L, 2);
+		seek(f, 0L, 0);
+		ldobj(f, l, file);
+		close(f);
+		return;
+	}
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f ldlib: %s\n", cputime(), file);
+	l = read(f, &arhdr, SAR_HDR);
+	if(l != SAR_HDR) {
+		diag("%s: short read on archive file symbol header", file);
+		goto out;
+	}
+	if(strncmp(arhdr.name, symname, strlen(symname))) {
+		diag("%s: first entry not symbol header", file);
+		goto out;
+	}
+
+	esym = SARMAG + SAR_HDR + atolwhex(arhdr.size);
+	off = SARMAG + SAR_HDR;
+
+	/*
+	 * just bang the whole symbol file into memory
+	 */
+	seek(f, off, 0);
+	cnt = esym - off;
+	start = malloc(cnt + 10);
+	cnt = read(f, start, cnt);
+	if(cnt <= 0){
+		close(f);
+		return;
+	}
+	stop = &start[cnt];
+	memset(stop, 0, 10);
+
+	work = 1;
+	while(work){
+		if(debug['v'])
+			Bprint(&bso, "%5.2f library pass: %s\n", cputime(), file);
+		Bflush(&bso);
+		work = 0;
+		for(e = start; e < stop; e = strchr(e+5, 0) + 1) {
+			s = lookup(e+5, 0);
+			if(s->type != SXREF)
+				continue;
+			sprint(pname, "%s(%s)", file, s->name);
+			if(debug['v'])
+				Bprint(&bso, "%5.2f library: %s\n", cputime(), pname);
+			Bflush(&bso);
+			l = e[1] & 0xff;
+			l |= (e[2] & 0xff) << 8;
+			l |= (e[3] & 0xff) << 16;
+			l |= (e[4] & 0xff) << 24;
+			seek(f, l, 0);
+			l = read(f, &arhdr, SAR_HDR);
+			if(l != SAR_HDR)
+				goto bad;
+			if(strncmp(arhdr.fmag, ARFMAG, sizeof(arhdr.fmag)))
+				goto bad;
+			l = atolwhex(arhdr.size);
+			ldobj(f, l, pname);
+			if(s->type == SXREF) {
+				diag("%s: failed to load: %s", file, s->name);
+				errorexit();
+			}
+			work = 1;
+			xrefresolv = 1;
+		}
+	}
+	return;
+
+bad:
+	diag("%s: bad or out of date archive", file);
+out:
+	close(f);
+}
+
+int
+zaddr(uchar *p, Adr *a, Sym *h[])
+{
+	int i, c;
+	long l;
+	Sym *s;
+	Auto *u;
+
+	c = p[2];
+	if(c < 0 || c > NSYM){
+		print("sym out of range: %d\n", c);
+		p[0] = ALAST+1;
+		return 0;
+	}
+	a->type = p[0];
+	a->reg = p[1];
+	a->sym = h[c];
+	a->name = p[3];
+	c = 4;
+
+	if(a->reg < 0 || a->reg > NREG) {
+		print("register out of range %d\n", a->reg);
+		p[0] = ALAST+1;
+		return 0;	/*  force real diagnostic */
+	}
+
+	switch(a->type) {
+	default:
+		print("unknown type %d\n", a->type);
+		p[0] = ALAST+1;
+		return 0;	/*  force real diagnostic */
+
+	case D_NONE:
+	case D_REG:
+	case D_FREG:
+		break;
+
+	case D_CTLREG:
+	case D_BRANCH:
+	case D_OREG:
+	case D_CONST:
+		a->offset = p[4] | (p[5]<<8) |
+			(p[6]<<16) | (p[7]<<24);
+		c += 4;
+		break;
+
+	case D_SCONST:
+		while(nhunk < NSNAME)
+			gethunk();
+		a->sval = (char*)hunk;
+		nhunk -= NSNAME;
+		hunk += NSNAME;
+
+		memmove(a->sval, p+4, NSNAME);
+		c += NSNAME;
+		break;
+
+	case D_VCONST:
+		while(nhunk < 12)
+			gethunk();
+		if((uintptr)hunk & 2){
+			nhunk -= 4;
+			hunk += 4;
+		}
+		a->vval = (vlong*)hunk;
+		nhunk -= 8;
+		hunk += 8;
+		*(long*)a->vval = p[4] | (p[5]<<8) |
+			(p[6]<<16) | (p[7]<<24);
+		*((long*)a->vval + 1) = p[8] | (p[9]<<8) |
+			(p[10]<<16) | (p[11]<<24);
+		c += 8;
+		break;
+
+	case D_FCONST:
+		while(nhunk < sizeof(Ieee))
+			gethunk();
+		a->ieee = (Ieee*)hunk;
+		nhunk -= NSNAME;
+		hunk += NSNAME;
+
+		a->ieee->l = p[4] | (p[5]<<8) |
+			(p[6]<<16) | (p[7]<<24);
+		a->ieee->h = p[8] | (p[9]<<8) |
+			(p[10]<<16) | (p[11]<<24);
+		c += 8;
+		break;
+	}
+	s = a->sym;
+	if(s == S)
+		return c;
+	i = a->name;
+	if(i != D_AUTO && i != D_PARAM)
+		return c;
+
+	l = a->offset;
+	for(u=curauto; u; u=u->link)
+		if(u->asym == s)
+		if(u->type == i) {
+			if(u->aoffset > l)
+				u->aoffset = l;
+			return c;
+		}
+
+	while(nhunk < sizeof(Auto))
+		gethunk();
+	u = (Auto*)hunk;
+	nhunk -= sizeof(Auto);
+	hunk += sizeof(Auto);
+
+	u->link = curauto;
+	curauto = u;
+	u->asym = s;
+	u->aoffset = l;
+	u->type = i;
+	return c;
+}
+
+void
+addlib(char *obj)
+{
+	char name[1024], comp[256], *p;
+	int i;
+
+	if(histfrogp <= 0)
+		return;
+
+	if(histfrog[0]->name[1] == '/') {
+		sprint(name, "");
+		i = 1;
+	} else
+	if(histfrog[0]->name[1] == '.') {
+		sprint(name, ".");
+		i = 0;
+	} else {
+		if(debug['9'])
+			sprint(name, "/%s/lib", thestring);
+		else
+			sprint(name, "/usr/%clib", thechar);
+		i = 0;
+	}
+
+	for(; i<histfrogp; i++) {
+		snprint(comp, sizeof comp, histfrog[i]->name+1);
+		for(;;) {
+			p = strstr(comp, "$O");
+			if(p == 0)
+				break;
+			memmove(p+1, p+2, strlen(p+2)+1);
+			p[0] = thechar;
+		}
+		for(;;) {
+			p = strstr(comp, "$M");
+			if(p == 0)
+				break;
+			if(strlen(comp)+strlen(thestring)-2+1 >= sizeof comp) {
+				diag("library component too long");
+				return;
+			}
+			memmove(p+strlen(thestring), p+2, strlen(p+2)+1);
+			memmove(p, thestring, strlen(thestring));
+		}
+		if(strlen(name) + strlen(comp) + 3 >= sizeof(name)) {
+			diag("library component too long");
+			return;
+		}
+		strcat(name, "/");
+		strcat(name, comp);
+	}
+	for(i=0; i<libraryp; i++)
+		if(strcmp(name, library[i]) == 0)
+			return;
+	if(libraryp == nelem(library)){
+		diag("too many autolibs; skipping %s", name);
+		return;
+	}
+
+	p = malloc(strlen(name) + 1);
+	strcpy(p, name);
+	library[libraryp] = p;
+	p = malloc(strlen(obj) + 1);
+	strcpy(p, obj);
+	libraryobj[libraryp] = p;
+	libraryp++;
+}
+
+void
+addhist(long line, int type)
+{
+	Auto *u;
+	Sym *s;
+	int i, j, k;
+
+	u = malloc(sizeof(Auto));
+	s = malloc(sizeof(Sym));
+	s->name = malloc(2*(histfrogp+1) + 1);
+
+	u->asym = s;
+	u->type = type;
+	u->aoffset = line;
+	u->link = curhist;
+	curhist = u;
+
+	j = 1;
+	for(i=0; i<histfrogp; i++) {
+		k = histfrog[i]->value;
+		s->name[j+0] = k>>8;
+		s->name[j+1] = k;
+		j += 2;
+	}
+}
+
+void
+histtoauto(void)
+{
+	Auto *l;
+
+	while(l = curhist) {
+		curhist = l->link;
+		l->link = curauto;
+		curauto = l;
+	}
+}
+
+void
+collapsefrog(Sym *s)
+{
+	int i;
+
+	/*
+	 * bad encoding of path components only allows
+	 * MAXHIST components. if there is an overflow,
+	 * first try to collapse xxx/..
+	 */
+	for(i=1; i<histfrogp; i++)
+		if(strcmp(histfrog[i]->name+1, "..") == 0) {
+			memmove(histfrog+i-1, histfrog+i+1,
+				(histfrogp-i-1)*sizeof(histfrog[0]));
+			histfrogp--;
+			goto out;
+		}
+
+	/*
+	 * next try to collapse .
+	 */
+	for(i=0; i<histfrogp; i++)
+		if(strcmp(histfrog[i]->name+1, ".") == 0) {
+			memmove(histfrog+i, histfrog+i+1,
+				(histfrogp-i-1)*sizeof(histfrog[0]));
+			goto out;
+		}
+
+	/*
+	 * last chance, just truncate from front
+	 */
+	memmove(histfrog+0, histfrog+1,
+		(histfrogp-1)*sizeof(histfrog[0]));
+
+out:
+	histfrog[histfrogp-1] = s;
+}
+
+void
+nopout(Prog *p)
+{
+	p->as = ANOP;
+	p->from.type = D_NONE;
+	p->to.type = D_NONE;
+}
+
+uchar*
+readsome(int f, uchar *buf, uchar *good, uchar *stop, int max)
+{
+	int n;
+
+	n = stop - good;
+	memmove(buf, good, stop - good);
+	stop = buf + n;
+	n = MAXIO - n;
+	if(n > max)
+		n = max;
+	n = read(f, stop, n);
+	if(n <= 0)
+		return 0;
+	return stop + n;
+}
+
+void
+ldobj(int f, long c, char *pn)
+{
+	long ipc;
+	Prog *p, *t;
+	uchar *bloc, *bsize, *stop;
+	Sym *h[NSYM], *s, *di;
+	int v, o, r, skip;
+	ulong sig;
+	static int files;
+	static char **filen;
+	char **nfilen;
+
+	if((files&15) == 0){
+		nfilen = mallocz((files+16)*sizeof(char*), 1);
+		memmove(nfilen, filen, files*sizeof(char*));
+		free(filen);
+		filen = nfilen;
+	}
+	filen[files++] = strdup(pn);
+
+	bsize = buf.xbuf;
+	bloc = buf.xbuf;
+	di = S;
+
+newloop:
+	memset(h, 0, sizeof(h));
+	version++;
+	histfrogp = 0;
+	ipc = pc;
+	skip = 0;
+
+loop:
+	if(c <= 0)
+		goto eof;
+	r = bsize - bloc;
+	if(r < 100 && r < c) {		/* enough for largest prog */
+		bsize = readsome(f, buf.xbuf, bloc, bsize, c);
+		if(bsize == 0)
+			goto eof;
+		bloc = buf.xbuf;
+		goto loop;
+	}
+	o = bloc[0];		/* as */
+	if(o <= AXXX || o >= ALAST) {
+		diag("%s: line %ld: opcode out of range %d", pn, pc-ipc, o);
+		print("	probably not a .%c file\n", thechar);
+		errorexit();
+	}
+	if(o == ANAME || o == ASIGNAME) {
+		sig = 0;
+		if(o == ASIGNAME){
+			sig = bloc[1] | (bloc[2]<<8) | (bloc[3]<<16) | (bloc[4]<<24);
+			bloc += 4;
+			c -= 4;
+		}
+		stop = memchr(&bloc[3], 0, bsize-&bloc[3]);
+		if(stop == 0){
+			bsize = readsome(f, buf.xbuf, bloc, bsize, c);
+			if(bsize == 0)
+				goto eof;
+			bloc = buf.xbuf;
+			stop = memchr(&bloc[3], 0, bsize-&bloc[3]);
+			if(stop == 0){
+				fprint(2, "%s: name too long\n", pn);
+				errorexit();
+			}
+		}
+		v = bloc[1];	/* type */
+		o = bloc[2];	/* sym */
+		bloc += 3;
+		c -= 3;
+
+		r = 0;
+		if(v == D_STATIC)
+			r = version;
+		s = lookup((char*)bloc, r);
+		c -= &stop[1] - bloc;
+		bloc = stop + 1;
+
+		if(debug['S'] && r == 0)
+			sig = 1729;
+		if(sig != 0){
+			if(s->sig != 0 && s->sig != sig)
+				diag("incompatible type signatures %lux(%s) and %lux(%s) for %s", s->sig, filen[s->file], sig, pn, s->name);
+			s->sig = sig;
+			s->file = files-1;
+		}
+
+		if(debug['W'])
+			print("	ANAME	%s\n", s->name);
+		h[o] = s;
+		if((v == D_EXTERN || v == D_STATIC) && s->type == 0)
+			s->type = SXREF;
+		if(v == D_FILE) {
+			if(s->type != SFILE) {
+				histgen++;
+				s->type = SFILE;
+				s->value = histgen;
+			}
+			if(histfrogp < MAXHIST) {
+				histfrog[histfrogp] = s;
+				histfrogp++;
+			} else
+				collapsefrog(s);
+		}
+		goto loop;
+	}
+
+	if(nhunk < sizeof(Prog))
+		gethunk();
+	p = (Prog*)hunk;
+	nhunk -= sizeof(Prog);
+	hunk += sizeof(Prog);
+
+	p->as = o;
+	p->reg = bloc[1];
+	p->line = bloc[2] | (bloc[3]<<8) | (bloc[4]<<16) | (bloc[5]<<24);
+
+	r = zaddr(bloc+6, &p->from, h) + 6;
+	r += zaddr(bloc+r, &p->to, h);
+	bloc += r;
+	c -= r;
+
+	if(p->reg < 0 || p->reg > NREG)
+		diag("register out of range %d", p->reg);
+
+	p->link = P;
+	p->cond = P;
+
+	if(debug['W'])
+		print("%P\n", p);
+
+	if(thechar == 'i') {
+		switch(o) {
+		case AMOV:
+			if(p->from.type == D_OREG || p->to.type == D_OREG)
+				o = AMOVW;
+			break;
+
+		case AMOVW:
+		case AMOVWU:
+			if(p->from.type == D_OREG || p->to.type == D_OREG)
+				o = AMOVW;
+			else
+				o = AMOV;
+			break;
+
+		case ADIVW:
+		case ADIVUW:
+			o = ADIV;
+			break;
+
+		case AREMW:
+		case AREMUW:
+			o = AREM;
+			break;
+
+		case AADDW:	o = AADD; break;
+		case ASUBW:	o = ASUB; break;
+		case ASLLW:	o = ASLL; break;
+		case ASRLW:	o = ASRL; break;
+		case ASRAW:	o = ASRA; break;
+		case AMULW:	o = AMUL; break;
+		}
+		p->as = o;
+	}
+
+	switch(o) {
+	case AHISTORY:
+		if(p->to.offset == -1) {
+			addlib(pn);
+			histfrogp = 0;
+			goto loop;
+		}
+		addhist(p->line, D_FILE);		/* 'z' */
+		if(p->to.offset)
+			addhist(p->to.offset, D_FILE1);	/* 'Z' */
+		histfrogp = 0;
+		goto loop;
+
+	case AEND:
+		histtoauto();
+		if(curtext != P)
+			curtext->to.autom = curauto;
+		curauto = 0;
+		curtext = P;
+		if(c)
+			goto newloop;
+		return;
+
+	case AGLOBL:
+		s = p->from.sym;
+		if(s == S) {
+			diag("GLOBL must have a name\n%P", p);
+			errorexit();
+		}
+		if(s->type == 0 || s->type == SXREF) {
+			s->type = SBSS;
+			s->value = 0;
+		}
+		if(s->type != SBSS) {
+			diag("redefinition: %s\n%P", s->name, p);
+			s->type = SBSS;
+			s->value = 0;
+		}
+		if(p->to.offset > s->value)
+			s->value = p->to.offset;
+		break;
+
+	case ADYNT:
+		if(p->to.sym == S) {
+			diag("DYNT without a sym\n%P", p);
+			break;
+		}
+		di = p->to.sym;
+		p->reg = 4;
+		if(di->type == SXREF) {
+			if(debug['z'])
+				Bprint(&bso, "%P set to %d\n", p, dtype);
+			di->type = SCONST;
+			di->value = dtype;
+			dtype += 4;
+		}
+		if(p->from.sym == S)
+			break;
+
+		p->from.offset = di->value;
+		p->from.sym->type = SDATA;
+		if(curtext == P) {
+			diag("DYNT not in text: %P", p);
+			break;
+		}
+		p->to.sym = curtext->from.sym;
+		p->to.type = D_CONST;
+		p->link = datap;
+		datap = p;
+		break;
+
+	case AINIT:
+		if(p->from.sym == S) {
+			diag("INIT without a sym\n%P", p);
+			break;
+		}
+		if(di == S) {
+			diag("INIT without previous DYNT\n%P", p);
+			break;
+		}
+		p->from.offset = di->value;
+		p->from.sym->type = SDATA;
+		p->link = datap;
+		datap = p;
+		break;
+	
+	case ADATA:
+		if(p->from.sym == S) {
+			diag("DATA without a sym\n%P", p);
+			break;
+		}
+		p->link = datap;
+		datap = p;
+		break;
+
+	case AGOK:
+		diag("unknown opcode\n%P", p);
+		p->pc = pc;
+		pc++;
+		break;
+
+	case ATEXT:
+		if(curtext != P) {
+			histtoauto();
+			curtext->to.autom = curauto;
+			curauto = 0;
+		}
+		skip = 0;
+		curtext = p;
+		autosize = p->to.offset;
+		if(autosize < 0)
+			autosize = -ptrsize;
+		else if(autosize != 0){
+			autosize = (autosize + 3) & ~3;
+			if(thechar == 'j'){
+				if((autosize & 4) != 0)
+					autosize += 4;
+			}else{
+				if((autosize & 4) == 0)
+					autosize += 4;
+			}
+		}
+		p->to.offset = autosize;
+		//autosize += ptrsize;
+		s = p->from.sym;
+		if(s == S) {
+			diag("TEXT must have a name\n%P", p);
+			errorexit();
+		}
+		if(s->type != 0 && s->type != SXREF) {
+			if(p->reg & DUPOK) {
+				skip = 1;
+				goto casedef;
+			}
+			diag("redefinition: %s\n%P", s->name, p);
+		}
+		s->type = STEXT;
+		s->value = pc;
+		lastp->link = p;
+		lastp = p;
+		p->pc = pc;
+		pc++;
+		if(textp == P) {
+			textp = p;
+			etextp = p;
+			goto loop;
+		}
+		etextp->cond = p;
+		etextp = p;
+		break;
+
+	case ASUB:
+	case ASUBW:
+		if(p->from.type == D_CONST)
+		if(p->from.name == D_NONE) {
+			p->from.offset = -p->from.offset;
+			p->as = o == ASUB ? AADD : AADDW;
+		}
+		goto casedef;
+
+	case AMOVF:
+		if(skip)
+			goto casedef;
+
+		if(p->from.type == D_FCONST) {
+			/* size sb 9 max */
+			sprint(literal, "$%lux", ieeedtof(p->from.ieee));
+			s = lookup(literal, 0);
+			if(s->type == 0) {
+				s->type = SBSS;
+				s->value = 4;
+				t = prg();
+				t->as = ADATA;
+				t->line = p->line;
+				t->from.type = D_OREG;
+				t->from.sym = s;
+				t->from.name = D_EXTERN;
+				t->reg = 4;
+				t->to = p->from;
+				t->link = datap;
+				datap = t;
+			}
+			p->from.type = D_OREG;
+			p->from.sym = s;
+			p->from.name = D_EXTERN;
+			p->from.offset = 0;
+		}
+		goto casedef;
+
+	case AMOVD:
+		if(skip)
+			goto casedef;
+
+		if(p->from.type == D_FCONST) {
+			/* size sb 18 max */
+			sprint(literal, "$%lux.%lux",
+				p->from.ieee->l, p->from.ieee->h);
+			s = lookup(literal, 0);
+			if(s->type == 0) {
+				s->type = SBSS;
+				s->value = 8;
+				t = prg();
+				t->as = ADATA;
+				t->line = p->line;
+				t->from.type = D_OREG;
+				t->from.sym = s;
+				t->from.name = D_EXTERN;
+				t->reg = 8;
+				t->to = p->from;
+				t->link = datap;
+				datap = t;
+			}
+			p->from.type = D_OREG;
+			p->from.sym = s;
+			p->from.name = D_EXTERN;
+			p->from.offset = 0;
+		}
+		goto casedef;
+
+	case ABGT:
+	case ABGTU:
+	case ABLE:
+	case ABLEU:
+		if(p->from.type == D_REG){
+			p->as = relrev(p->as);
+			if(p->reg == NREG)
+				p->reg = REGZERO;
+			else{
+				r = p->from.reg;
+				p->from.reg = p->reg;
+				p->reg = r;
+			}
+		}
+		goto casedef;
+
+	case ASGT:
+	case ASGTU:
+		r = p->from.reg;
+		p->from.reg = p->reg;
+		p->reg = r;
+		p->as = p->as == ASGT ? ASLT : ASLTU;
+		goto casedef;
+
+	case AMOV:
+		if(p->from.type == D_CONST &&
+		   p->from.name == D_NONE &&
+		   p->from.reg != NREG &&
+		   p->from.reg != REGZERO){
+			p->as = AADD;
+			p->reg = p->from.reg;
+			p->from.reg = NREG;
+		}
+		goto casedef;
+
+/*
+	case AMUL:
+	case AMULXSS:
+	case AMULXSU:
+	case AMULXUU:
+		if(!debug['m'])
+			goto casedef;
+		if(o != AMUL || p->from.type != D_REG){
+			diag("unsupported multiply operation");
+			if(!debug['v'])
+				prasm(p);
+			break;
+		}
+		print("transforming multiply");
+		prasm(p);
+		if(p->reg == NREG)
+			p->reg = p->to.reg;
+		p->as = ACUSTOM;
+		p->from.type = D_CONST;
+		p->from.name = D_NONE;
+		p->from.offset = 0;
+		p->to.type = D_CONST;
+		p->to.name = D_NONE;
+		p->to.offset = p->from.reg<<16 | p->reg<<8 | p->to.reg;
+		p->from.reg = NREG;
+		p->to.reg = NREG;
+		prasm(p);
+		goto casedef;
+*/
+
+	default:
+	casedef:
+		if(skip)
+			nopout(p);
+
+		if(p->to.type == D_BRANCH)
+			p->to.offset += ipc;
+		lastp->link = p;
+		lastp = p;
+		p->pc = pc;
+		pc++;
+		break;
+	}
+	goto loop;
+
+eof:
+	diag("truncated object file: %s", pn);
+}
+
+Sym*
+lookup(char *symb, int v)
+{
+	Sym *s;
+	char *p;
+	long h;
+	int c, l;
+
+	h = v;
+	for(p=symb; c = *p; p++)
+		h = h+h+h + c;
+	l = (p - symb) + 1;
+	if(h < 0)
+		h = ~h;
+	h %= NHASH;
+	for(s = hash[h]; s != S; s = s->link)
+		if(s->version == v)
+		if(memcmp(s->name, symb, l) == 0)
+			return s;
+
+	while(nhunk < sizeof(Sym))
+		gethunk();
+	s = (Sym*)hunk;
+	nhunk -= sizeof(Sym);
+	hunk += sizeof(Sym);
+
+	s->name = malloc(l);
+	memmove(s->name, symb, l);
+
+	s->link = hash[h];
+	s->type = 0;
+	s->version = v;
+	s->value = 0;
+	s->sig = 0;
+	hash[h] = s;
+	return s;
+}
+
+Prog*
+prg(void)
+{
+	Prog *p;
+
+	while(nhunk < sizeof(Prog))
+		gethunk();
+	p = (Prog*)hunk;
+	nhunk -= sizeof(Prog);
+	hunk += sizeof(Prog);
+
+	*p = zprg;
+	return p;
+}
+
+void
+gethunk(void)
+{
+	char *h;
+	long nh;
+
+	nh = NHUNK;
+	if(thunk >= 5L*NHUNK) {
+		nh = 5L*NHUNK;
+		if(thunk >= 25L*NHUNK)
+			nh = 25L*NHUNK;
+	}
+	h = mysbrk(nh);
+	if(h == (char*)-1) {
+		diag("out of memory");
+		errorexit();
+	}
+	hunk = h;
+	nhunk = nh;
+	thunk += nh;
+}
+
+void
+doprof1(void)
+{
+	Sym *s;
+	long n;
+	Prog *p, *q;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f profile 1\n", cputime());
+	Bflush(&bso);
+	s = lookup("__mcount", 0);
+	n = 1;
+	for(p = firstp->link; p != P; p = p->link) {
+		if(p->as == ATEXT) {
+			q = prg();
+			q->line = p->line;
+			q->link = datap;
+			datap = q;
+			q->as = ADATA;
+			q->from.type = D_OREG;
+			q->from.name = D_EXTERN;
+			q->from.offset = n*4;
+			q->from.sym = s;
+			q->reg = 4;
+			q->to = p->from;
+			q->to.type = D_CONST;
+
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			p->link = q;
+			p = q;
+			p->as = AMOVW;
+			p->from.type = D_OREG;
+			p->from.name = D_EXTERN;
+			p->from.sym = s;
+			p->from.offset = n*4 + 4;
+			p->to.type = D_REG;
+			p->to.reg = REGTMP;
+
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			p->link = q;
+			p = q;
+			p->as = AADD;
+			p->from.type = D_CONST;
+			p->from.offset = 1;
+			p->to.type = D_REG;
+			p->to.reg = REGTMP;
+
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			p->link = q;
+			p = q;
+			p->as = AMOVW;
+			p->from.type = D_REG;
+			p->from.reg = REGTMP;
+			p->to.type = D_OREG;
+			p->to.name = D_EXTERN;
+			p->to.sym = s;
+			p->to.offset = n*4 + 4;
+
+			n += 2;
+			continue;
+		}
+	}
+	q = prg();
+	q->line = 0;
+	q->link = datap;
+	datap = q;
+
+	q->as = ADATA;
+	q->from.type = D_OREG;
+	q->from.name = D_EXTERN;
+	q->from.sym = s;
+	q->reg = 4;
+	q->to.type = D_CONST;
+	q->to.offset = n;
+
+	s->type = SBSS;
+	s->value = n*4;
+}
+
+void
+doprof2(void)
+{
+	Sym *s2, *s4;
+	Prog *p, *q, *q2, *ps2, *ps4;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f profile 2\n", cputime());
+	Bflush(&bso);
+
+	if(debug['e']){
+		s2 = lookup("_tracein", 0);
+		s4 = lookup("_traceout", 0);
+	}else{
+		s2 = lookup("_profin", 0);
+		s4 = lookup("_profout", 0);
+	}
+	if(s2->type != STEXT || s4->type != STEXT) {
+		if(debug['e'])
+			diag("_tracein/_traceout not defined %d %d", s2->type, s4->type);
+		else
+			diag("_profin/_profout not defined");
+		return;
+	}
+
+	ps2 = P;
+	ps4 = P;
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT) {
+			if(p->from.sym == s2) {
+				ps2 = p;
+				p->reg = 1;
+			}
+			if(p->from.sym == s4) {
+				ps4 = p;
+				p->reg = 1;
+			}
+		}
+	}
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT) {
+			if(p->reg & NOPROF) {
+				for(;;) {
+					q = p->link;
+					if(q == P)
+						break;
+					if(q->as == ATEXT)
+						break;
+					p = q;
+				}
+				continue;
+			}
+
+			/*
+			 * CALL	profin, R2
+			 */
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			if(debug['e']){		/* embedded tracing */
+				q2 = prg();
+				p->link = q2;
+				q2->link = q;
+
+				q2->line = p->line;
+				q2->pc = p->pc;
+
+				q2->as = AJMP;
+				q2->to.type = D_BRANCH;
+				q2->to.sym = p->to.sym;
+				q2->cond = q->link;
+			}else
+				p->link = q;
+			p = q;
+			p->as = AJAL;
+			p->to.type = D_BRANCH;
+			p->cond = ps2;
+			p->to.sym = s2;
+
+			continue;
+		}
+		if(p->as == ARET) {
+			/*
+			 * RET (default)
+			 */
+			if(debug['e']){		/* embedded tracing */
+				q = prg();
+				q->line = p->line;
+				q->pc = p->pc;
+				q->link = p->link;
+				p->link = q;
+				p = q;
+			}
+			/*
+			 * RET
+			 */
+			q = prg();
+			q->as = ARET;
+			q->from = p->from;
+			q->to = p->to;
+			q->link = p->link;
+			p->link = q;
+
+			/*
+			 * CALL	profout
+			 */
+			p->as = AJAL;
+			p->from = zprg.from;
+			p->to = zprg.to;
+			p->to.type = D_BRANCH;
+			p->cond = ps4;
+			p->to.sym = s4;
+
+			p = q;
+
+			continue;
+		}
+	}
+}
+
+void
+nuxiinit(void)
+{
+	int i, c;
+
+	for(i=0; i<4; i++){
+		c = find1(0x04030201L, i+1);
+		if(i < 2)
+			inuxi2[i] = c;
+		if(i < 1)
+			inuxi1[i] = c;
+		inuxi4[i] = c;
+		inuxi8[i] = c;
+		inuxi8[i+4] = c+4;
+		fnuxi4[i] = c;
+		fnuxi8[i] = c;
+		fnuxi8[i+4] = c+4;
+	}
+	if(debug['v']) {
+		Bprint(&bso, "inuxi = ");
+		for(i=0; i<1; i++)
+			Bprint(&bso, "%d", inuxi1[i]);
+		Bprint(&bso, " ");
+		for(i=0; i<2; i++)
+			Bprint(&bso, "%d", inuxi2[i]);
+		Bprint(&bso, " ");
+		for(i=0; i<4; i++)
+			Bprint(&bso, "%d", inuxi4[i]);
+		Bprint(&bso, " ");
+		for(i=0; i<8; i++)
+			Bprint(&bso, "%d", inuxi8[i]);
+		Bprint(&bso, "\nfnuxi = ");
+		for(i=0; i<8; i++)
+			Bprint(&bso, "%d", fnuxi8[i]);
+		Bprint(&bso, "\n");
+	}
+	Bflush(&bso);
+}
+
+int
+find1(long l, int c)
+{
+	char *p;
+	int i;
+
+	p = (char*)&l;
+	for(i=0; i<4; i++)
+		if(*p++ == c)
+			return i;
+	return 0;
+}
+
+long
+ieeedtof(Ieee *ieeep)
+{
+	int exp;
+	long v;
+
+	if(ieeep->h == 0)
+		return 0;
+	exp = (ieeep->h>>20) & ((1L<<11)-1L);
+	exp -= (1L<<10) - 2L;
+	v = (ieeep->h & 0xfffffL) << 3;
+	v |= (ieeep->l >> 29) & 0x7L;
+	if((ieeep->l >> 28) & 1) {
+		v++;
+		if(v & 0x800000L) {
+			v = (v & 0x7fffffL) >> 1;
+			exp++;
+		}
+	}
+	if(exp <= -126 || exp >= 130)
+		diag("double fp to single fp overflow");
+	v |= ((exp + 126) & 0xffL) << 23;
+	v |= ieeep->h & 0x80000000L;
+	return v;
+}
+
+double
+ieeedtod(Ieee *ieeep)
+{
+	Ieee e;
+	double fr;
+	int exp;
+
+	if(ieeep->h & (1L<<31)) {
+		e.h = ieeep->h & ~(1L<<31);
+		e.l = ieeep->l;
+		return -ieeedtod(&e);
+	}
+	if(ieeep->l == 0 && ieeep->h == 0)
+		return 0;
+	fr = ieeep->l & ((1L<<16)-1L);
+	fr /= 1L<<16;
+	fr += (ieeep->l>>16) & ((1L<<16)-1L);
+	fr /= 1L<<16;
+	fr += (ieeep->h & (1L<<20)-1L) | (1L<<20);
+	fr /= 1L<<21;
+	exp = (ieeep->h>>20) & ((1L<<11)-1L);
+	exp -= (1L<<10) - 2L;
+	return ldexp(fr, exp);
+}
--- /dev/null
+++ b/sys/src/cmd/jl/optab.c
@@ -1,0 +1,194 @@
+#include	"l.h"
+
+Optab	optab[] =
+{
+ /* add		*/	AADD,		C_REG,		C_REG,		0,1,	4,	OOP,		0,	0,
+ /* sub		*/	ASUB,		C_REG,		C_REG,		0,5,	4,	OOP,		0,	0x20,
+ /* sll		*/	ASLL,		C_REG,		C_REG,		0,0,	4,	OOP,		1,	0,
+ /* slt		*/	ASLT,		C_REG,		C_REG,		0,0,	4,	OOP,		2,	0,
+ /* sltu	*/	ASLTU,		C_REG,		C_REG,		0,0,	4,	OOP,		3,	0,
+ /* xor		*/	AXOR,		C_REG,		C_REG,		0,5,	4,	OOP,		4,	0,
+ /* srl		*/	ASRL,		C_REG,		C_REG,		0,0,	4,	OOP,		5,	0,
+ /* sra		*/	ASRA,		C_REG,		C_REG,		0,0,	4,	OOP,		5,	0x20,
+ /* or		*/	AOR,		C_REG,		C_REG,		0,5,	4,	OOP,		6,	0,
+ /* and		*/	AAND,		C_REG,		C_REG,		0,5,	4,	OOP,		7,	0,
+ /* mul		*/	AMUL,		C_REG,		C_REG,		0,0,	4,	OOP,		0,	0x01,
+ /* mulh	*/	AMULH,		C_REG,		C_REG,		0,0,	4,	OOP,		1,	0x01,
+ /* mulhsu	*/	AMULHSU,	C_REG,		C_REG,		0,0,	4,	OOP,		2,	0x01,
+ /* mulhu	*/	AMULHU,		C_REG,		C_REG,		0,0,	4,	OOP,		3,	0x01,
+ /* div		*/	ADIV,		C_REG,		C_REG,		0,0,	4,	OOP,		4,	0x01,
+ /* divu	*/	ADIVU,		C_REG,		C_REG,		0,0,	4,	OOP,		5,	0x01,
+ /* rem		*/	AREM,		C_REG,		C_REG,		0,0,	4,	OOP,		6,	0x01,
+ /* remu	*/	AREMU,		C_REG,		C_REG,		0,0,	4,	OOP,		7,	0x01,
+
+ /* addw	*/	AADDW,		C_REG,		C_REG,		0,22,	4,	OOP_32,		0,	0,
+ /* subw	*/	ASUBW,		C_REG,		C_REG,		0,22,	4,	OOP_32,		0,	0x20,
+ /* sllw	*/	ASLLW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		1,	0,
+ /* srlw	*/	ASRLW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		5,	0,
+ /* sraw	*/	ASRAW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		5,	0x20,
+
+ /* mulw	*/	AMULW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		0,	0x01,
+ /* divw	*/	ADIVW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		4,	0x01,
+ /* divuw	*/	ADIVUW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		5,	0x01,
+ /* remw	*/	AREMW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		6,	0x01,
+ /* remuw	*/	AREMUW,		C_REG,		C_REG,		0,0,	4,	OOP_32,		7,	0x01,
+
+ /* slli	*/	ASLL,		C_SCON,		C_REG,		1,8,	4,	OOP_IMM,	1,	0,
+ /* srli	*/	ASRL,		C_SCON,		C_REG,		1,9,	4,	OOP_IMM,	5,	0,
+ /* srai	*/	ASRA,		C_SCON,		C_REG,		1,9,	4,	OOP_IMM,	5,	0x20,
+
+ /* addi	*/	AADD,		C_SCON,		C_REG,		2,10,	4,	OOP_IMM,	0,	0,
+ /* slti	*/	ASLT,		C_SCON,		C_REG,		2,0,	4,	OOP_IMM,	2,	0,
+ /* sltiu	*/	ASLTU,		C_SCON,		C_REG,		2,0,	4,	OOP_IMM,	3,	0,
+ /* xori	*/	AXOR,		C_SCON,		C_REG,		2,0,	4,	OOP_IMM,	4,	0,
+ /* ori		*/	AOR,		C_SCON,		C_REG,		2,0,	4,	OOP_IMM,	6,	0,
+ /* andi	*/	AAND,		C_SCON,		C_REG,		2,13,	4,	OOP_IMM,	7,	0,
+
+ /* addiw	*/	AADDW,		C_SCON,		C_REG,		2,23,	4,	OOP_IMM_32,	0,	0,
+ /* slliw	*/	ASLLW,		C_SCON,		C_REG,		1,0,	4,	OOP_IMM_32,	1,	0,
+ /* srliw	*/	ASRLW,		C_SCON,		C_REG,		1,0,	4,	OOP_IMM_32,	5,	0,
+ /* sraiw	*/	ASRAW,		C_SCON,		C_REG,		1,0,	4,	OOP_IMM_32,	5,	0x20,
+
+ /* beq		*/	ABEQ,		C_REG,		C_SBRA,		3,14,	4,	OBRANCH,	0,	0,
+ /* bne		*/	ABNE,		C_REG,		C_SBRA,		3,15,	4,	OBRANCH,	1,	0,
+ /* blt		*/	ABLT,		C_REG,		C_SBRA,		3,0,	4,	OBRANCH,	4,	0,
+ /* bge		*/	ABGE,		C_REG,		C_SBRA,		3,0,	4,	OBRANCH,	5,	0,
+ /* bltu	*/	ABLTU,		C_REG,		C_SBRA,		3,0,	4,	OBRANCH,	6,	0,
+ /* bgeu	*/	ABGEU,		C_REG,		C_SBRA,		3,0,	4,	OBRANCH,	7,	0,
+
+ /* jal		*/	AJAL,		C_NONE,		C_SBRA,		4,11,	4,	OJAL,		0,	REGLINK,
+ /* jal		*/	AJMP,		C_NONE,		C_SBRA,		4,12,	4,	OJAL,		0,	REGZERO,
+ /* jal		*/	AJAL,		C_NONE,		C_LBRA,		18,0,	8,	OJALR,		0,	REGLINK,
+ /* jal		*/	AJMP,		C_NONE,		C_LBRA,		18,0,	8,	OJALR,		0,	REGZERO,
+ /* jalr	*/	AJAL,		C_NONE,		C_SOREG,	5,3,	4,	OJALR,		0,	REGLINK,
+ /* jalr	*/	AJMP,		C_NONE,		C_SOREG,	5,4,	4,	OJALR,		0,	REGZERO,
+
+ /* sb		*/	AMOVB,		C_ZREG,		C_SOREG,	6,0,	4,	OSTORE,		0,	0,
+ /* sb		*/	AMOVBU,		C_ZREG,		C_SOREG,	6,0,	4,	OSTORE,		0,	0,
+ /* sh		*/	AMOVH,		C_ZREG,		C_SOREG,	6,0,	4,	OSTORE,		1,	0,
+ /* sw		*/	AMOVW,		C_ZREG,		C_SOREG,	6,19,	4,	OSTORE,		2,	0,
+ /* sd		*/	AMOV,		C_ZREG,		C_SOREG,	6,25,	4,	OSTORE,		3,	0,
+ /* fsw 	*/	AMOVF,		C_FREG,		C_SOREG,	6,20,	4,	OSTORE_FP,	2,	0,
+ /* fsd 	*/	AMOVD,		C_FREG,		C_SOREG,	6,21,	4,	OSTORE_FP,	3,	0,
+
+ /* sb		*/	AMOVB,		C_ZREG,		C_LEXT,		12,0,	8,	OSTORE,		0,	0,
+ /* sb		*/	AMOVBU,		C_ZREG,		C_LEXT,		12,0,	8,	OSTORE,		0,	0,
+ /* sh		*/	AMOVH,		C_ZREG,		C_LEXT,		12,0,	8,	OSTORE,		1,	0,
+ /* sw		*/	AMOVW,		C_ZREG,		C_LEXT,		12,0,	8,	OSTORE,		2,	0,
+ /* sd		*/	AMOV,		C_ZREG,		C_LEXT,		12,0,	8,	OSTORE,		3,	0,
+ /* fsw 	*/	AMOVF,		C_FREG,		C_LEXT,		12,0,	8,	OSTORE_FP,	2,	0,
+ /* fsd 	*/	AMOVD,		C_FREG,		C_LEXT,		12,0,	8,	OSTORE_FP,	3,	0,
+			
+ /* sb		*/	AMOVB,		C_ZREG,		C_LOREG,	15,0,	12,	OSTORE,		0,	0,
+ /* sb		*/	AMOVBU,		C_ZREG,		C_LOREG,	15,0,	12,	OSTORE,		0,	0,
+ /* sh		*/	AMOVH,		C_ZREG,		C_LOREG,	15,0,	12,	OSTORE,		1,	0,
+ /* sw		*/	AMOVW,		C_ZREG,		C_LOREG,	15,0,	12,	OSTORE,		2,	0,
+ /* sd		*/	AMOV,		C_ZREG,		C_LOREG,	15,0,	12,	OSTORE,		3,	0,
+ /* fsw 	*/	AMOVF,		C_FREG,		C_LOREG,	15,0,	12,	OSTORE_FP,	2,	0,
+ /* fsd 	*/	AMOVD,		C_FREG,		C_LOREG,	15,0,	12,	OSTORE_FP,	3,	0,
+
+ /* lb		*/	AMOVB,		C_SOREG,	C_REG,		7,0,	4,	OLOAD,		0,	0,
+ /* lh		*/	AMOVH,		C_SOREG,	C_REG,		7,0,	4,	OLOAD,		1,	0,
+ /* lw		*/	AMOVW,		C_SOREG,	C_REG,		7,16,	4,	OLOAD,		2,	0,
+ /* ld		*/	AMOV,		C_SOREG,	C_REG,		7,24,	4,	OLOAD,		3,	0,
+ /* lbu		*/	AMOVBU,		C_SOREG,	C_REG,		7,0,	4,	OLOAD,		4,	0,
+ /* lhu		*/	AMOVHU,		C_SOREG,	C_REG,		7,0,	4,	OLOAD,		5,	0,
+ /* lwu		*/	AMOVWU,		C_SOREG,	C_REG,		7,0,	4,	OLOAD,		6,	0,
+ /* flw		*/	AMOVF,		C_SOREG,	C_FREG,		7,17,	4,	OLOAD_FP,	2,	0,
+ /* fld		*/	AMOVD,		C_SOREG,	C_FREG,		7,18,	4,	OLOAD_FP,	3,	0,
+
+ /* lui		*/	AMOV,		C_UCON,		C_REG,		8,7,	4,	OLUI,		0,	0,
+
+ /* lb		*/	AMOVB,		C_LEXT,		C_REG,		13,0,	8,	OLOAD,		0,	0,
+ /* lh		*/	AMOVH,		C_LEXT,		C_REG,		13,0,	8,	OLOAD,		1,	0,
+ /* lw		*/	AMOVW,		C_LEXT,		C_REG,		13,0,	8,	OLOAD,		2,	0,
+ /* ld		*/	AMOV,		C_LEXT,		C_REG,		13,0,	8,	OLOAD,		3,	0,
+ /* lbu		*/	AMOVBU,		C_LEXT,		C_REG,		13,0,	8,	OLOAD,		4,	0,
+ /* lhu		*/	AMOVHU,		C_LEXT,		C_REG,		13,0,	8,	OLOAD,		5,	0,
+ /* lwu		*/	AMOVWU,		C_LEXT,		C_REG,		13,0,	8,	OLOAD,		6,	0,
+ /* flw		*/	AMOVF,		C_LEXT,		C_FREG,		13,0,	8,	OLOAD_FP,	2,	0,
+ /* fld		*/	AMOVD,		C_LEXT,		C_FREG,		13,0,	8,	OLOAD_FP,	3,	0,
+
+ /* lb		*/	AMOVB,		C_LOREG,	C_REG,		16,0,	12,	OLOAD,		0,	0,
+ /* lh		*/	AMOVH,		C_LOREG,	C_REG,		16,0,	12,	OLOAD,		1,	0,
+ /* lw		*/	AMOVW,		C_LOREG,	C_REG,		16,0,	12,	OLOAD,		2,	0,
+ /* ld		*/	AMOV,		C_LOREG,	C_REG,		16,0,	12,	OLOAD,		3,	0,
+ /* lbu		*/	AMOVBU,		C_LOREG,	C_REG,		16,0,	12,	OLOAD,		4,	0,
+ /* lhu		*/	AMOVHU,		C_LOREG,	C_REG,		16,0,	12,	OLOAD,		5,	0,
+ /* lwu		*/	AMOVWU,		C_LOREG,	C_REG,		16,0,	12,	OLOAD,		6,	0,
+ /* flw		*/	AMOVF,		C_LOREG,	C_FREG,		16,0,	12,	OLOAD_FP,	2,	0,
+ /* fld		*/	AMOVD,		C_LOREG,	C_FREG,		16,0,	12,	OLOAD_FP,	3,	0,
+
+ /* addi	*/	AMOVW,		C_SCON,		C_REG,		11,6,	4,	OOP_IMM,	0,	0,
+ /* addi	*/	AMOVW,		C_SECON,	C_REG,		11,0,	4,	OOP_IMM,	0,	0,
+ /* addi	*/	AMOVW,		C_SACON,	C_REG,		11,0,	4,	OOP_IMM,	0,	0,
+ /* lui,addi	*/	AMOVW,		C_LCON,		C_REG,		9,0,	8,	OOP_IMM,	0,	0,
+ /* lui,addi	*/	AMOVW,		C_LECON,	C_REG,		9,0,	8,	OOP_IMM,	0,	0,
+ /* ",",add	*/	AMOVW,		C_LACON,	C_REG,		14,0,	12,	OOP_IMM,	0,	0,
+
+ /* add		*/	AMOV,		C_REG,		C_REG,		0,2,	4,	OOP,		0,	0,
+ /* addi	*/	AMOV,		C_SCON,		C_REG,		11,6,	4,	OOP_IMM,	0,	0,
+ /* addi	*/	AMOV,		C_SECON,	C_REG,		11,0,	4,	OOP_IMM,	0,	0,
+ /* addi	*/	AMOV,		C_SACON,	C_REG,		11,0,	4,	OOP_IMM,	0,	0,
+ /* lui,addi	*/	AMOV,		C_LCON,		C_REG,		9,0,	8,	OOP_IMM,	0,	0,
+ /* lui,addi	*/	AMOV,		C_LECON,	C_REG,		20,0,	8,	OOP_IMM,	0,	0,
+ /* lui,s[rl]ai */	AMOV,		C_VCON,		C_REG,		21,0,	8,	OOP_IMM,	5,	0x20,
+ /* ",",add	*/	AMOV,		C_LACON,	C_REG,		14,0,	12,	OOP_IMM,	0,	0,
+ /* ",",add	*/	AADD,		C_LCON,		C_REG,		14,0,	12,	OOP_IMM,	0,	0,
+ /* ",",and	*/	AAND,		C_LCON,		C_REG,		14,0,	12,	OOP_IMM,	7,	0,
+ /* ",",or	*/	AOR,		C_LCON,		C_REG,		14,0,	12,	OOP_IMM,	6,	0,
+ /* ",",xor	*/	AXOR,		C_LCON,		C_REG,		14,0,	12,	OOP_IMM,	4,	0,
+
+ /* addiw	*/	AMOVW,		C_REG,		C_REG,		19,23,	4,	OOP_IMM_32,	0,	0,
+ /* andi	*/	AMOVBU,		C_ZREG,		C_REG,		10,0,	4,	OOP_IMM,	7,	0xFF,
+ /* slli,srli	*/	AMOVHU,		C_ZREG,		C_REG,		10,0,	8,	OOP_IMM,	5,	16,
+ /* slli,srli	*/	AMOVWU,		C_ZREG,		C_REG,		10,0,	8,	OOP_IMM,	5,	0,
+ /* slli,srai	*/	AMOVB,		C_ZREG,		C_REG,		10,0,	8,	OOP_IMM,	5,	24+(0x20<<5),
+ /* slli,srai	*/	AMOVH,		C_ZREG,		C_REG,		10,0,	8,	OOP_IMM,	5,	16+(0x20<<5),
+
+			ASYS,		C_NONE,		C_SCON,		24,0,	4,	OSYSTEM,	0,	0,
+			ACSRRW,		C_CTLREG,	C_REG,		22,0,	4,	OSYSTEM,	1,	0,
+			ACSRRS,		C_CTLREG,	C_REG,		22,0,	4,	OSYSTEM,	2,	0,
+			ACSRRC,		C_CTLREG,	C_REG,		22,0,	4,	OSYSTEM,	3,	0,
+			ACSRRWI,	C_CTLREG,	C_REG,		22,0,	4,	OSYSTEM,	5,	0,
+			ACSRRSI,	C_CTLREG,	C_REG,		22,0,	4,	OSYSTEM,	6,	0,
+			ACSRRCI,	C_CTLREG,	C_REG,		22,0,	4,	OSYSTEM,	7,	0,
+
+			AADDF,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x00,
+			ASUBF,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x04,
+			AMULF,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x08,
+			ADIVF,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x0c,
+			AADDD,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x01,
+			ASUBD,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x05,
+			AMULD,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x09,
+			ADIVD,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x7,	0x0d,
+
+			ACMPEQF,	C_FREG,		C_REG,		0,0,	4,	OOP_FP,		0x2,	0x50,
+			ACMPLEF,	C_FREG,		C_REG,		0,0,	4,	OOP_FP,		0x0,	0x50,
+			ACMPLTF,	C_FREG,		C_REG,		0,0,	4,	OOP_FP,		0x1,	0x50,
+			ACMPEQD,	C_FREG,		C_REG,		0,0,	4,	OOP_FP,		0x2,	0x51,
+			ACMPLED,	C_FREG,		C_REG,		0,0,	4,	OOP_FP,		0x0,	0x51,
+			ACMPLTD,	C_FREG,		C_REG,		0,0,	4,	OOP_FP,		0x1,	0x51,
+
+ /* float move  */	AMOVF,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x0,	0x10,
+ /* dbl move    */	AMOVD,		C_FREG,		C_FREG,		0,0,	4,	OOP_FP,		0x0,	0x11,
+
+ /* float->dbl  */	AMOVFD,		C_FREG,		C_FREG,		17,0,	4,	OOP_FP,		0x0,	0x21,
+ /* dbl->float  */	AMOVDF,		C_FREG,		C_FREG,		17,0,	4,	OOP_FP,		0x1,	0x20,
+ /* float->int	*/	AMOVFW,		C_FREG,		C_REG,		17,0,	4,	OOP_FP,		0x0,	0x60,
+ /* dbl->int	*/	AMOVDW,		C_FREG,		C_REG,		17,0,	4,	OOP_FP,		0x0,	0x61,
+ /* int->float	*/	AMOVWF,		C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x0,	0x68,
+ /* uint->float	*/	AMOVUF,		C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x1,	0x68,
+ /* int->dbl	*/	AMOVWD,		C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x0,	0x69,
+ /* uint->dbl	*/	AMOVUD,		C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x1,	0x69,
+ /* float->vlong*/	AMOVFV,		C_FREG,		C_REG,		17,0,	4,	OOP_FP,		0x2,	0x60,
+ /* dbl->vlong	*/	AMOVDV,		C_FREG,		C_REG,		17,0,	4,	OOP_FP,		0x2,	0x61,
+ /* vlong->float*/	AMOVVF,		C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x2,	0x68,
+ /* uvlong->float*/	AMOVUVF,	C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x3,	0x68,
+ /* vlong->dbl	*/	AMOVVD,		C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x2,	0x69,
+ /* uvlong->dbl	*/	AMOVUVD,	C_REG,		C_FREG,		17,0,	4,	OOP_FP,		0x3,	0x69,
+
+ /* -		*/	AWORD,		C_NONE,		C_LCON,		25,0,	4,	0,		0,	0,
+ /* -		*/	ATEXT,		C_LEXT,		C_LCON,		26,0,	0,	0,		0,	0,
+ /* -		*/	AXXX,		C_NONE,		C_NONE,		0,0,	0,	0,		0,	0,
+};
--- /dev/null
+++ b/sys/src/cmd/jl/pass.c
@@ -1,0 +1,592 @@
+#include	"l.h"
+
+void
+dodata(void)
+{
+	int i, t;
+	Sym *s;
+	Prog *p, *p1;
+	long orig, orig1, v;
+	int odd;
+	long long vv;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f dodata\n", cputime());
+	Bflush(&bso);
+	for(p = datap; p != P; p = p->link) {
+		s = p->from.sym;
+		if(p->as == ADYNT || p->as == AINIT)
+			s->value = dtype;
+		if(s->type == SBSS)
+			s->type = SDATA;
+		if(s->type != SDATA)
+			diag("initialize non-data (%d): %s\n%P",
+				s->type, s->name, p);
+		v = p->from.offset + p->reg;
+		if(v > s->value)
+			diag("initialize bounds (%ld): %s\n%P",
+				s->value, s->name, p);
+	}
+
+	if(debug['t']) {
+		/*
+		 * pull out string constants
+		 */
+		for(p = datap; p != P; p = p->link) {
+			s = p->from.sym;
+			if(p->to.type == D_SCONST)
+				s->type = SSTRING;
+		}
+	}
+
+	/*
+	 * pass 1
+	 *	assign 'small' variables to data segment
+	 *	(rational is that data segment is more easily
+	 *	 addressed through offset on SB)
+	 */
+	odd = 4;
+	orig = 0;
+	for(i=0; i<NHASH; i++)
+	for(s = hash[i]; s != S; s = s->link) {
+		t = s->type;
+		if(t != SDATA && t != SBSS)
+			continue;
+		v = s->value;
+		if(v == 0) {
+			// omit diag for _fltused
+			// TODO diag("%s: no size", s->name);
+			v = 1;
+		}
+		while(v & 3)
+			v++;
+		s->value = v;
+		if(v > MINSIZ)
+			continue;
+		if(v >= 8 && (orig & odd) != 0)
+			orig += odd;
+		s->value = orig;
+		orig += v;
+		s->type = SDATA1;
+	}
+	while(orig & 7)
+		orig++;
+	orig1 = orig;
+
+	/*
+	 * pass 2
+	 *	assign 'data' variables to data segment
+	 */
+	for(i=0; i<NHASH; i++)
+	for(s = hash[i]; s != S; s = s->link) {
+		t = s->type;
+		if(t != SDATA) {
+			if(t == SDATA1)
+				s->type = SDATA;
+			continue;
+		}
+		v = s->value;
+		if((orig & odd) != 0)
+			orig += odd;
+		s->value = orig;
+		orig += v;
+		s->type = SDATA1;
+	}
+
+	while(orig & 7)
+		orig++;
+	datsize = orig;
+
+	/*
+	 * pass 3
+	 *	everything else to bss segment
+	 */
+	for(i=0; i<NHASH; i++)
+	for(s = hash[i]; s != S; s = s->link) {
+		if(s->type != SBSS)
+			continue;
+		v = s->value;
+		if((orig & odd) != 0)
+			orig += odd;
+		s->value = orig;
+		orig += v;
+	}
+	while(orig & 7)
+		orig++;
+	bsssize = orig-datsize;
+
+	/*
+	 * pass 4
+	 *	add literals to all large values.
+	 *	at this time:
+	 *		small data is allocated DATA
+	 *		large data is allocated DATA1
+	 *		large bss is allocated BSS
+	 *	the new literals are loaded between
+	 *	small data and large data.
+	 */
+	orig = 0;
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as != AMOV && p->as != AMOVW)
+			continue;
+		if(p->from.type != D_CONST && p->from.type != D_VCONST)
+			continue;
+		if(s = p->from.sym) {
+			if(!debug['r'])
+				continue;
+			t = s->type;
+			if(t != SDATA && t != SDATA1 && t != SBSS)
+				continue;
+			t = p->from.name;
+			if(t != D_EXTERN && t != D_STATIC)
+				continue;
+			v = s->value + p->from.offset;
+			if(v >= 0 && v <= 2*BIG)
+				continue;
+			if(strcmp(s->name, "setSB") == 0)
+				continue;
+			/* size should be 19 max */
+			if(strlen(s->name) >= 10)	/* has loader address */
+				sprint(literal, "$%p.%lux", s, p->from.offset);
+			else
+				sprint(literal, "$%s.%d.%lux", s->name, s->version, p->from.offset);
+		} else {
+			if(p->from.type == D_VCONST){
+				vv = *p->from.vval;
+				if( 0 && (v = vconshift(vv)) >= 0 && !debug['r']){
+					if(v < 12)
+						vv <<= 12 - v;
+					else
+						vv >>= v - 12;
+					p->from.type = D_CONST;
+					p->from.offset = (long)vv & ~0xFFF;
+					p1 = prg();
+					p1->line = p->line;
+					p1->to = p->to;
+					p1->from.type = D_CONST;
+					if(v < 12) {
+						p1->as = ASRA;
+						p1->from.offset = 12 - v;
+					} else {
+						p1->as = ASLL;
+						p1->from.offset = v - 12;
+					}
+					p1->link = p->link;
+					p->link = p1;
+					continue;
+				}
+				sprint(literal, "$%#llux", vv);
+			} else {
+				if(!debug['r'])
+					continue;
+				if(p->from.name != D_NONE)
+					continue;
+				if(p->from.reg != NREG)
+					continue;
+				v = p->from.offset;
+				if(v >= -BIG && v < BIG)
+					continue;
+				if((v & (BIG-1)) == 0)
+					continue;
+				/* size should be 11 max */
+				sprint(literal, "$%#lux", v);
+			}
+		}
+		s = lookup(literal, 0);
+		if(s->type == 0) {
+			s->type = SDATA;
+			if(p->from.type == D_VCONST && (orig & odd) != 0)
+				orig += odd;
+			s->value = orig1+orig;
+			p1 = prg();
+			p1->line = p->line;
+			p1->as = ADATA;
+			p1->from.type = D_OREG;
+			p1->from.sym = s;
+			p1->from.name = D_EXTERN;
+			p1->reg = p->from.type == D_VCONST ? 8 : 4;
+			p1->to = p->from;
+			p1->link = datap;
+			orig += p1->reg;
+			datap = p1;
+		}
+		if(s->type != SDATA)
+			diag("literal not data: %s", s->name);
+		if(thechar == 'i' && p->as == AMOV)
+			p->as = AMOVW;
+		p->from.type = D_OREG;
+		p->from.sym = s;
+		p->from.name = D_EXTERN;
+		p->from.offset = 0;
+		continue;
+	}
+	while(orig & 7)
+		orig++;
+
+	/*
+	 * pass 5
+	 *	re-adjust offsets
+	 */
+	for(i=0; i<NHASH; i++)
+	for(s = hash[i]; s != S; s = s->link) {
+		t = s->type;
+		if(t == SBSS) {
+			s->value += orig;
+			continue;
+		}
+		if(t == SDATA1) {
+			s->type = SDATA;
+			s->value += orig;
+			continue;
+		}
+	}
+	datsize += orig;
+	xdefine("setSB", SDATA, 0L+BIG);
+	xdefine("bdata", SDATA, 0L);
+	xdefine("edata", SDATA, datsize);
+	xdefine("end", SBSS, datsize+bsssize);
+	xdefine("etext", STEXT, 0L);
+}
+
+void
+undef(void)
+{
+	int i;
+	Sym *s;
+
+	for(i=0; i<NHASH; i++)
+	for(s = hash[i]; s != S; s = s->link)
+		if(s->type == SXREF)
+			diag("%s: not defined", s->name);
+}
+
+int
+relinv(int a)
+{
+
+	switch(a) {
+	case ABEQ:	return ABNE;
+	case ABNE:	return ABEQ;
+
+	case ABLT:	return ABGE;
+	case ABGE:	return ABLT;
+
+	case ABLTU:	return ABGEU;
+	case ABGEU:	return ABLTU;
+	}
+	return 0;
+}
+
+int
+relrev(int a)
+{
+	switch (a) {
+	case ABGT:	return ABLT;
+	case ABGTU:	return ABLTU;
+	case ABLE:	return ABGE;
+	case ABLEU:	return ABGEU;
+	}
+	return 0;
+}
+
+void
+follow(void)
+{
+	if(debug['v'])
+		Bprint(&bso, "%5.2f follow\n", cputime());
+	Bflush(&bso);
+
+	firstp = prg();
+	lastp = firstp;
+	xfol(textp);
+
+	firstp = firstp->link;
+	lastp->link = P;
+}
+
+void
+xfol(Prog *p)
+{
+	Prog *q, *r;
+	int a, b, i;
+
+loop:
+	if(p == P)
+		return;
+	a = p->as;
+	if(a == ATEXT)
+		curtext = p;
+	if(a == AJMP) {
+		q = p->cond;
+		if(q != P) {
+			p->mark |= FOLL;
+			p = q;
+			if(!(p->mark & FOLL))
+				goto loop;
+		}
+	}
+	if(p->mark & FOLL) {
+		for(i=0,q=p; i<4; i++,q=q->link) {
+			if(q == lastp)
+				break;
+			b = 0;		/* set */
+			a = q->as;
+			if(a == ANOP) {
+				i--;
+				continue;
+			}
+			if(a == AJMP || a == ARET)
+				goto copy;
+			if(!q->cond || (q->cond->mark&FOLL))
+				continue;
+			b = relinv(a);
+			if(!b)
+				continue;
+		copy:
+			for(;;) {
+				r = prg();
+				*r = *p;
+				if(!(r->mark&FOLL))
+					print("cant happen 1\n");
+				r->mark |= FOLL;
+				if(p != q) {
+					p = p->link;
+					lastp->link = r;
+					lastp = r;
+					continue;
+				}
+				lastp->link = r;
+				lastp = r;
+				if(a == AJMP || a == ARET)
+					return;
+				r->as = b;
+				r->cond = p->link;
+				r->link = p->cond;
+				if(!(r->link->mark&FOLL))
+					xfol(r->link);
+				if(!(r->cond->mark&FOLL))
+					print("cant happen 2\n");
+				return;
+			}
+		}
+		a = AJMP;
+		q = prg();
+		q->as = a;
+		q->line = p->line;
+		q->to.type = D_BRANCH;
+		q->to.offset = p->pc;
+		q->cond = p;
+		p = q;
+	}
+	p->mark |= FOLL;
+	lastp->link = p;
+	lastp = p;
+	if(a == AJMP || a == ARET){
+		return;
+	}
+	if(p->cond != P)
+	if(a != AJAL && p->link != P) {
+		xfol(p->link);
+		p = p->cond;
+		if(p == P || (p->mark&FOLL))
+			return;
+		goto loop;
+	}
+	p = p->link;
+	goto loop;
+}
+
+void
+patch(void)
+{
+	long c, vexit;
+	Prog *p, *q;
+	Sym *s;
+	int a;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f patch\n", cputime());
+	Bflush(&bso);
+	mkfwd();
+	s = lookup("exit", 0);
+	vexit = s->value;
+	for(p = firstp; p != P; p = p->link) {
+		a = p->as;
+		if(a == ATEXT)
+			curtext = p;
+		if((a == AJAL || a == AJMP || a == ARET) &&
+		   p->to.type != D_BRANCH && p->to.sym != S) {
+			s = p->to.sym;
+			if(s->type != STEXT) {
+				diag("undefined: %s\n%P", s->name, p);
+				s->type = STEXT;
+				s->value = vexit;
+			}
+			p->to.offset = s->value;
+			p->to.type = D_BRANCH;
+		}
+		if(p->to.type != D_BRANCH)
+			continue;
+		c = p->to.offset;
+		for(q = firstp; q != P;) {
+			if(q->forwd != P)
+			if(c >= q->forwd->pc) {
+				q = q->forwd;
+				continue;
+			}
+			if(c == q->pc)
+				break;
+			q = q->link;
+		}
+		if(q == P) {
+			diag("branch out of range %ld => %ld\n%P", p->pc, c, p);
+			p->to.type = D_NONE;
+		}
+		p->cond = q;
+	}
+
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT)
+			curtext = p;
+		if(p->cond != P) {
+			p->cond = brloop(p->cond);
+			if(p->cond != P)
+			if(p->to.type == D_BRANCH)
+				p->to.offset = p->cond->pc;
+		}
+	}
+}
+
+#define	LOG	5
+void
+mkfwd(void)
+{
+	Prog *p;
+	long dwn[LOG], cnt[LOG], i;
+	Prog *lst[LOG];
+
+	for(i=0; i<LOG; i++) {
+		if(i == 0)
+			cnt[i] = 1; else
+			cnt[i] = LOG * cnt[i-1];
+		dwn[i] = 1;
+		lst[i] = P;
+	}
+	i = 0;
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT)
+			curtext = p;
+		i--;
+		if(i < 0)
+			i = LOG-1;
+		p->forwd = P;
+		dwn[i]--;
+		if(dwn[i] <= 0) {
+			dwn[i] = cnt[i];
+			if(lst[i] != P)
+				lst[i]->forwd = p;
+			lst[i] = p;
+		}
+	}
+}
+
+Prog*
+brloop(Prog *p)
+{
+	Prog *q;
+	int c;
+
+	for(c=0; p!=P;) {
+		if(p->as != AJMP)
+			return p;
+		q = p->cond;
+		if(q <= p) {
+			c++;
+			if(q == p || c > 5000)
+				break;
+		}
+		p = q;
+	}
+	return P;
+}
+
+xlong
+atolwhex(char *s)
+{
+	xlong n;
+	int f;
+
+	n = 0;
+	f = 0;
+	while(*s == ' ' || *s == '\t')
+		s++;
+	if(*s == '-' || *s == '+') {
+		if(*s++ == '-')
+			f = 1;
+		while(*s == ' ' || *s == '\t')
+			s++;
+	}
+	if(s[0]=='0' && s[1]){
+		if(s[1]=='x' || s[1]=='X'){
+			s += 2;
+			for(;;){
+				if(*s >= '0' && *s <= '9')
+					n = n*16 + *s++ - '0';
+				else if(*s >= 'a' && *s <= 'f')
+					n = n*16 + *s++ - 'a' + 10;
+				else if(*s >= 'A' && *s <= 'F')
+					n = n*16 + *s++ - 'A' + 10;
+				else
+					break;
+			}
+		} else
+			while(*s >= '0' && *s <= '7')
+				n = n*8 + *s++ - '0';
+	} else
+		while(*s >= '0' && *s <= '9')
+			n = n*10 + *s++ - '0';
+	if(f)
+		n = -n;
+	return n;
+}
+
+vlong
+rnd(vlong v, vlong r)
+{
+	vlong c;
+
+	if(r <= 0)
+		return v;
+	v += r - 1;
+	c = v % r;
+	if(c < 0)
+		c += r;
+	v -= c;
+	return v;
+}
+
+int
+vconshift(vlong constant)
+{
+	vlong orig;
+	long w;
+	int shift;
+
+	orig = constant;
+	if(constant == 0)
+		return -1;
+	shift = 12;
+	while((constant & 0xFFF) != 0){
+		shift--;
+		constant <<= 1;
+	}
+	while((constant & 0x1000) == 0){
+		shift++;
+		constant >>= 1;
+	}
+	w = (long)constant;
+	constant = shift > 12? (vlong)w << shift - 12 : (vlong)w >> 12 - shift;
+	if(constant != orig)
+		return -1;
+	return shift;
+}
--- /dev/null
+++ b/sys/src/cmd/jl/span.c
@@ -1,0 +1,529 @@
+#include	"l.h"
+
+void
+span(void)
+{
+	Prog *p, *q;
+	Sym *setext, *s;
+	Optab *o;
+	int m, bflag, i, spass;
+	long c, otxt, v;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f span\n", cputime());
+	Bflush(&bso);
+
+	bflag = 0;
+	c = 0;
+	otxt = c;
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT)
+			c = (c + 3) & ~3;
+		p->pc = c;
+		o = oplook(p);
+		m = o->size;
+		if(!debug['c']){
+			if(o->ctype && asmout(p, o, 2) == 2){
+				bflag = 1;
+				p->mark |= COMPR;
+				m = 2;
+			}
+		}
+		if(m == 0) {
+			if(p->as == ATEXT) {
+				curtext = p;
+				autosize = p->to.offset + ptrsize;
+				if(p->from.sym != S)
+					p->from.sym->value = c;
+				/* need passes to resolve branches */
+				if(c-otxt >= 0x1000)
+					bflag = 1;
+				otxt = c;
+				continue;
+			}
+			diag("zero-width instruction\n%P", p);
+			continue;
+		}
+		c += m;
+	}
+
+	/*
+	 * Multi-pass expansion of span dependent instructions
+	 *   Bcond JAL C.Bcond C.JAL C.JMP
+	 */
+	spass = 0;
+	while(bflag) {
+		if(debug['v'])
+			Bprint(&bso, "%5.2f span1\n", cputime());
+		bflag = 0;
+		spass ^= SPASS;
+		c = 0;
+		for(p = firstp; p != P; p = p->link) {
+			o = oplook(p);
+			m = o->size;
+			if(p->mark&COMPR)
+				m = 2;
+			/* opcode type beq or jal? */
+			if((o->type == 3 || o->type == 4) && p->cond) {
+				if((p->cond->mark&SPASS) == spass)
+					p->pc = c;
+				if(m == 2){
+					/*
+					 * If instruction was compressed,
+					 * check again in case
+					 * branch range is now too large.
+					 */
+					m = asmout(p, o, 3);
+					if(m != 2){
+						p->mark &= ~COMPR;
+						bflag = 1;
+					}
+				}
+				otxt = p->cond->pc - p->pc;
+				if(otxt < 0)
+					otxt = -otxt;
+				if(o->type == 3){
+					/*
+					 * If Bcond branch range exceeds 4K,
+					 * replace it by the
+					 * logically negated branch around a JMP.
+					 */
+					if(otxt >= 0x1000) {
+						q = prg();
+						q->link = p->link;
+						q->line = p->line;
+						q->as = AJMP;
+						q->to.type = D_BRANCH;
+						q->cond = p->cond;
+						p->link = q;
+						p->as = relinv(p->as);
+						p->cond = q->link;
+						p->optab = 0;
+						o = oplook(p);
+						q->mark = spass ^ SPASS;
+						m = asmout(p, o, 2);
+						if(m == 2)
+							p->mark |= COMPR;
+						q->pc = p->pc + m;
+						bflag = 1;
+					}
+				}else{
+					/*
+					 * If JAL branch range exceeds 1M,
+					 * change address class
+					 * and recalculate instruction length.
+					 */
+					if(otxt >= 0x100000) {
+						p->to.class = C_LBRA + 1;
+						p->optab = 0;
+						o = oplook(p);
+						m = asmout(p, o, 3);
+						p->mark &= ~COMPR;
+					}
+				}
+			}
+			if(p->as == ATEXT)
+				c = (c + 3) & ~3;
+			p->pc = c;
+			p->mark ^= SPASS;
+			if(m == 0) {
+				if(p->as == ATEXT) {
+					curtext = p;
+					autosize = p->to.offset + ptrsize;
+					if(p->from.sym != S)
+						p->from.sym->value = c;
+					continue;
+				}
+				diag("zero-width instruction\n%P", p);
+				continue;
+			}
+			c += m;
+		}
+	}
+
+	if(debug['t']) {
+		/* 
+		 * add strings to text segment
+		 */
+		c = rnd(c, 8);
+		for(i=0; i<NHASH; i++)
+		for(s = hash[i]; s != S; s = s->link) {
+			if(s->type != SSTRING)
+				continue;
+			v = s->value;
+			while(v & 3)
+				v++;
+			s->value = c;
+			c += v;
+		}
+	}
+
+	c = rnd(c, 8);
+
+	setext = lookup("etext", 0);
+	if(setext != S) {
+		setext->value = c;
+		textsize = c;
+	}
+	if(INITRND)
+		INITDAT = rnd(INITTEXT + c, INITRND);
+	if(debug['v'])
+		Bprint(&bso, "tsize = %lux\n", textsize);
+	Bflush(&bso);
+}
+		
+void
+xdefine(char *p, int t, long v)
+{
+	Sym *s;
+
+	s = lookup(p, 0);
+	if(s->type == 0 || s->type == SXREF) {
+		s->type = t;
+		s->value = v;
+	}
+}
+
+long
+regoff(Adr *a)
+{
+
+	instoffset = 0;
+	a->class = aclass(a) + 1;
+	return instoffset;
+}
+
+int
+classreg(Adr *a)
+{
+	if(a->reg == NREG) {
+		switch(a->class - 1) {
+		case C_SEXT:
+		case C_SECON:
+		case C_LECON:
+			return REGSB;
+		case C_SAUTO:
+		case C_LAUTO:
+		case C_SACON:
+		case C_LACON:
+			return REGSP;
+		}
+	}
+	return a->reg;
+}
+
+int
+aclass(Adr *a)
+{
+	Sym *s;
+	int t;
+
+	switch(a->type) {
+	case D_NONE:
+		return C_NONE;
+
+	case D_REG:
+		return C_REG;
+
+	case D_CTLREG:
+		return C_CTLREG;
+
+	case D_FREG:
+		return C_FREG;
+
+	case D_OREG:
+		switch(a->name) {
+		case D_EXTERN:
+		case D_STATIC:
+			if(a->sym == 0 || a->sym->name == 0) {
+				print("null sym external\n");
+				print("%D\n", a);
+				return C_GOK;
+			}
+			t = a->sym->type;
+			if(t == 0 || t == SXREF) {
+				diag("undefined external: %s in %s",
+					a->sym->name, TNAME);
+				a->sym->type = SDATA;
+			}
+			instoffset = a->sym->value + a->offset - BIG;
+			if(instoffset >= -BIG && instoffset < BIG)
+				return C_SEXT;
+			return C_LEXT;
+		case D_AUTO:
+			instoffset = autosize + a->offset;
+			if(instoffset >= -BIG && instoffset < BIG)
+				return C_SAUTO;
+			return C_LAUTO;
+
+		case D_PARAM:
+			instoffset = autosize + a->offset + ptrsize;
+			if(instoffset >= -BIG && instoffset < BIG)
+				return C_SAUTO;
+			return C_LAUTO;
+		case D_NONE:
+			instoffset = a->offset;
+			if(instoffset == 0)
+				return C_ZOREG;
+			if(instoffset >= -BIG && instoffset < BIG)
+				return C_SOREG;
+			return C_LOREG;
+		}
+		return C_GOK;
+
+	case D_FCONST:
+		return C_FCON;
+
+	case D_VCONST:
+		return C_VCON;
+
+	case D_CONST:
+		switch(a->name) {
+
+		case D_NONE:
+			instoffset = a->offset;
+			if(a->reg != NREG && a->reg != REGZERO){
+				if(instoffset >= -BIG && instoffset < BIG)
+					return C_SRCON;
+				return C_LRCON;
+			}
+		consize:
+			if(instoffset == 0)
+				return C_ZCON;
+			if(instoffset >= -0x800 && instoffset <= 0x7ff)
+				return C_SCON;
+			if((instoffset & 0xfff) == 0)
+				return C_UCON;
+			return C_LCON;
+
+		case D_EXTERN:
+		case D_STATIC:
+			instoffx = 0;
+			s = a->sym;
+			if(s == S)
+				break;
+			t = s->type;
+			switch(t) {
+			case 0:
+			case SXREF:
+				diag("undefined external: %s in %s",
+					s->name, TNAME);
+				s->type = SDATA;
+				break;
+			case SCONST:
+				instoffset = s->value + a->offset;
+				goto consize;
+			case STEXT:
+			case SLEAF:
+			case SSTRING:
+				instoffset = s->value + a->offset;
+				instoffx = INITTEXT;
+				return C_LECON;
+			}
+			instoffset = s->value + a->offset - BIG;
+			if(instoffset >= -BIG && instoffset < BIG && instoffset != 0L)
+				return C_SECON;
+			instoffset = s->value + a->offset;
+			instoffx = INITDAT;
+			return C_LECON;
+
+		case D_AUTO:
+			instoffset = autosize + a->offset;
+			if(instoffset >= -BIG && instoffset < BIG)
+				return C_SACON;
+			return C_LACON;
+
+		case D_PARAM:
+			instoffset = autosize + a->offset + ptrsize;
+			if(instoffset >= -BIG && instoffset < BIG)
+				return C_SACON;
+			return C_LACON;
+		}
+		return C_GOK;
+
+	case D_BRANCH:
+		return C_SBRA;
+	}
+	return C_GOK;
+}
+
+Optab*
+oplook(Prog *p)
+{
+	int a1, a2, a3, r;
+	char *c1, *c3;
+	Optab *o, *e;
+
+	a1 = p->optab;
+	if(a1)
+		return optab+(a1-1);
+	a1 = p->from.class;
+	if(a1 == 0) {
+		a1 = aclass(&p->from) + 1;
+		p->from.class = a1;
+	}
+	a1--;
+	a3 = p->to.class;
+	if(a3 == 0) {
+		a3 = aclass(&p->to) + 1;
+		p->to.class = a3;
+	}
+	a3--;
+	a2 = C_NONE;
+	if(p->reg != NREG)
+		a2 = C_REG;
+	r = p->as;
+	o = oprange[r].start;
+	if(o == 0) {
+		a1 = opcross[repop[r]][a1][a3];
+		if(a1) {
+			p->optab = a1+1;
+			return optab+a1;
+		}
+		o = oprange[r].stop; /* just generate an error */
+		a1 = p->from.class - 1;
+	}
+	e = oprange[r].stop;
+
+	c1 = xcmp[a1];
+	c3 = xcmp[a3];
+	for(; o<e; o++)
+		if(c1[o->a1])
+		if(c3[o->a3]) {
+			p->optab = (o-optab)+1;
+			return o;
+		}
+	diag("illegal combination %A %d %d %d",
+		p->as, a1, a2, a3);
+	if(!debug['a'])
+		prasm(p);
+	o = optab;
+	p->optab = (o-optab)+1;
+	return o;
+}
+
+int
+cmp(int a, int b)
+{
+
+	if(a == b)
+		return 1;
+	switch(a) {
+	case C_LCON:
+		if(b == C_ZCON || b == C_SCON || b == C_UCON)
+			return 1;
+		break;
+	case C_UCON:
+		if(b == C_ZCON)
+			return 1;
+		break;
+	case C_SCON:
+		if(b == C_ZCON)
+			return 1;
+		break;
+	case C_LACON:
+		if(b == C_SACON)
+			return 1;
+		break;
+	case C_LRCON:
+		if(b == C_SRCON)
+			return 1;
+		break;
+	case C_LBRA:
+		if(b == C_SBRA)
+			return 1;
+		break;
+	case C_LEXT:
+		if(b == C_SEXT)
+			return 1;
+		break;
+	case C_LAUTO:
+		if(b == C_SAUTO)
+			return 1;
+		break;
+	case C_ZREG:
+		if(b == C_REG || b == C_ZCON)
+			return 1;
+		break;
+	case C_LOREG:
+		if(b == C_ZOREG || b == C_SOREG || b == C_SAUTO || b == C_LAUTO)
+			return 1;
+		break;
+	case C_SOREG:
+		if(b == C_ZOREG || b == C_SAUTO || b == C_SEXT)
+			return 1;
+		break;
+	}
+	return 0;
+}
+
+int
+ocmp(void *a1, void *a2)
+{
+	Optab *p1, *p2;
+	int n;
+
+	p1 = (Optab*)a1;
+	p2 = (Optab*)a2;
+	n = p1->as - p2->as;
+	if(n)
+		return n;
+	n = p1->a1 - p2->a1;
+	if(n)
+		return n;
+	n = p1->a3 - p2->a3;
+	if(n)
+		return n;
+	return 0;
+}
+
+void
+buildop(void)
+{
+	int i, n, r;
+
+	for(i=0; i<32; i++)
+		for(n=0; n<32; n++)
+			xcmp[i][n] = cmp(n, i);
+	for(n=0; optab[n].as != AXXX; n++)
+		;
+	qsort(optab, n, sizeof(optab[0]), ocmp);
+	for(i=0; i<n; i++) {
+		r = optab[i].as;
+		oprange[r].start = optab+i;
+		while(optab[i].as == r)
+			i++;
+		oprange[r].stop = optab+i;
+		i--;
+	}
+
+	buildrep(1, AMOVW);
+}
+
+void
+buildrep(int x, int as)
+{
+	Opcross *p;
+	Optab *e, *s, *o;
+	int a1, a3, n;
+
+	if(C_GOK >= 32 || x >= nelem(opcross)) {
+		diag("assumptions fail in buildrep");
+		errorexit();
+	}
+	repop[as] = x;
+	p = (opcross + x);
+	s = oprange[as].start;
+	e = oprange[as].stop;
+	for(o=e-1; o>=s; o--) {
+		n = o-optab;
+		for(a1=0; a1<32; a1++) {
+			if(!xcmp[a1][o->a1])
+				continue;
+			for(a3=0; a3<32; a3++)
+				if(xcmp[a3][o->a3])
+					(*p)[a1][a3] = n;
+		}
+	}
+	oprange[as].start = 0;
+}