ref: 0311f011228a5d26a7a73128c489782870b69693
dir: /sys/src/games/mix/mix.c/
#include <u.h> #include <libc.h> #include <ctype.h> #include <bio.h> #include <avl.h> #include "mix.h" #include "y.tab.h" struct Resvd { char *name; long lex; int c; int f; } res[] = { { "NOP", LOP, 0, F(0, 5) }, { "ADD", LOP, 1, F(0, 5) }, { "FADD", LOP, 1, 6 }, { "SUB", LOP, 2, F(0, 5) }, { "FSUB", LOP, 2, 6 }, { "MUL", LOP, 3, F(0, 5) }, { "FMUL", LOP, 3, 6 }, { "DIV", LOP, 4, F(0, 5) }, { "FDIV", LOP, 4, 6 }, { "NUM", LOP, 5, 0 }, { "CHAR", LOP, 5, 1 }, { "HLT", LOP, 5, 2 }, { "SLA", LOP, 6, 0 }, { "SRA", LOP, 6, 1 }, { "SLAX", LOP, 6, 2 }, { "SRAX", LOP, 6, 3 }, { "SLC", LOP, 6, 4 }, { "SRC", LOP, 6, 5 }, { "MOVE", LOP, 7, 1 }, { "LDA", LOP, 8, F(0, 5) }, { "LD1", LOP, 9, F(0, 5) }, { "LD2", LOP, 10, F(0, 5) }, { "LD3", LOP, 11, F(0, 5) }, { "LD4", LOP, 12, F(0, 5) }, { "LD5", LOP, 13, F(0, 5) }, { "LD6", LOP, 14, F(0, 5) }, { "LDX", LOP, 15, F(0, 5) }, { "LDAN", LOP, 16, F(0, 5) }, { "LD1N", LOP, 17, F(0, 5) }, { "LD2N", LOP, 18, F(0, 5) }, { "LD3N", LOP, 19, F(0, 5) }, { "LD4N", LOP, 20, F(0, 5) }, { "LD5N", LOP, 21, F(0, 5) }, { "LD6N", LOP, 22, F(0, 5) }, { "LDXN", LOP, 23, F(0, 5) }, { "STA", LOP, 24, F(0, 5) }, { "ST1", LOP, 25, F(0, 5) }, { "ST2", LOP, 26, F(0, 5) }, { "ST3", LOP, 27, F(0, 5) }, { "ST4", LOP, 28, F(0, 5) }, { "ST5", LOP, 29, F(0, 5) }, { "ST6", LOP, 30, F(0, 5) }, { "STX", LOP, 31, F(0, 5) }, { "STJ", LOP, 32, F(0, 2) }, { "STZ", LOP, 33, F(0, 5) }, { "JBUS", LOP, 34, 0 }, { "IOC", LOP, 35, 0 }, { "IN", LOP, 36, 0 }, { "OUT", LOP, 37, 0 }, { "JRED", LOP, 38, 0 }, { "JMP", LOP, 39, 0 }, { "JSJ", LOP, 39, 1 }, { "JOV", LOP, 39, 2 }, { "JNOV", LOP, 39, 3 }, { "JL", LOP, 39, 4 }, { "JE", LOP, 39, 5 }, { "JG", LOP, 39, 6 }, { "JGE", LOP, 39, 7 }, { "JNE", LOP, 39, 8 }, { "JLE", LOP, 39, 9 }, { "JAN", LOP, 40, 0 }, { "JAZ", LOP, 40, 1 }, { "JAP", LOP, 40, 2 }, { "JANN", LOP, 40, 3 }, { "JANZ", LOP, 40, 4 }, { "JANP", LOP, 40, 5 }, { "J1N", LOP, 41, 0 }, { "J1Z", LOP, 41, 1 }, { "J1P", LOP, 41, 2 }, { "J1NN", LOP, 41, 3 }, { "J1NZ", LOP, 41, 4 }, { "J1NP", LOP, 41, 5 }, { "J2N", LOP, 42, 0 }, { "J2Z", LOP, 42, 1 }, { "J2P", LOP, 42, 2 }, { "J2NN", LOP, 42, 3 }, { "J2NZ", LOP, 42, 4 }, { "J2NP", LOP, 42, 5 }, { "J3N", LOP, 43, 0 }, { "J3Z", LOP, 43, 1 }, { "J3P", LOP, 43, 2 }, { "J3NN", LOP, 43, 3 }, { "J3NZ", LOP, 43, 4 }, { "J3NP", LOP, 43, 5 }, { "J4N", LOP, 44, 0 }, { "J4Z", LOP, 44, 1 }, { "J4P", LOP, 44, 2 }, { "J4NN", LOP, 44, 3 }, { "J4NZ", LOP, 44, 4 }, { "J4NP", LOP, 44, 5 }, { "J5N", LOP, 45, 0 }, { "J5Z", LOP, 45, 1 }, { "J5P", LOP, 45, 2 }, { "J5NN", LOP, 45, 3 }, { "J5NZ", LOP, 45, 4 }, { "J5NP", LOP, 45, 5 }, { "J6N", LOP, 46, 0 }, { "J6Z", LOP, 46, 1 }, { "J6P", LOP, 46, 2 }, { "J6NN", LOP, 46, 3 }, { "J6NZ", LOP, 46, 4 }, { "J6NP", LOP, 46, 5 }, { "JXN", LOP, 47, 0 }, { "JXZ", LOP, 47, 1 }, { "JXP", LOP, 47, 2 }, { "JXNN", LOP, 47, 3 }, { "JXNZ", LOP, 47, 4 }, { "JXNP", LOP, 47, 5 }, { "INCA", LOP, 48, 0 }, { "DECA", LOP, 48, 1 }, { "ENTA", LOP, 48, 2 }, { "ENNA", LOP, 48, 3 }, { "INC1", LOP, 49, 0 }, { "DEC1", LOP, 49, 1 }, { "ENT1", LOP, 49, 2 }, { "ENN1", LOP, 49, 3 }, { "INC2", LOP, 50, 0 }, { "DEC2", LOP, 50, 1 }, { "ENT2", LOP, 50, 2 }, { "ENN2", LOP, 50, 3 }, { "INC3", LOP, 51, 0 }, { "DEC3", LOP, 51, 1 }, { "ENT3", LOP, 51, 2 }, { "ENN3", LOP, 51, 3 }, { "INC4", LOP, 52, 0 }, { "DEC4", LOP, 52, 1 }, { "ENT4", LOP, 52, 2 }, { "ENN4", LOP, 52, 3 }, { "INC5", LOP, 53, 0 }, { "DEC5", LOP, 53, 1 }, { "ENT5", LOP, 53, 2 }, { "ENN5", LOP, 53, 3 }, { "INC6", LOP, 54, 0 }, { "DEC6", LOP, 54, 1 }, { "ENT6", LOP, 54, 2 }, { "ENN6", LOP, 54, 3 }, { "INCX", LOP, 55, 0 }, { "DECX", LOP, 55, 1 }, { "ENTX", LOP, 55, 2 }, { "ENNX", LOP, 55, 3 }, { "CMPA", LOP, 56, F(0, 5) }, { "FCMP", LOP, 56, 6 }, { "CMP1", LOP, 57, F(0, 5) }, { "CMP2", LOP, 58, F(0, 5) }, { "CMP3", LOP, 59, F(0, 5) }, { "CMP4", LOP, 60, F(0, 5) }, { "CMP5", LOP, 61, F(0, 5) }, { "CMP6", LOP, 62, F(0, 5) }, { "CMPX", LOP, 63, F(0, 5) }, { "EQU", LEQU, -1, -1 }, { "ORIG", LORIG, -1, -1 }, { "CON", LCON, -1, -1 }, { "ALF", LALF, -1, -1 }, { "END", LEND, -1, -1 }, { "0H", LHERE, 0, -1 }, { "1H", LHERE, 1, -1 }, { "2H", LHERE, 2, -1 }, { "3H", LHERE, 3, -1 }, { "4H", LHERE, 4, -1 }, { "5H", LHERE, 5, -1 }, { "6H", LHERE, 6, -1 }, { "7H", LHERE, 7, -1 }, { "8H", LHERE, 8, -1 }, { "9H", LHERE, 9, -1 }, { "0B", LBACK, 0, -1 }, { "1B", LBACK, 1, -1 }, { "2B", LBACK, 2, -1 }, { "3B", LBACK, 3, -1 }, { "4B", LBACK, 4, -1 }, { "5B", LBACK, 5, -1 }, { "6B", LBACK, 6, -1 }, { "7B", LBACK, 7, -1 }, { "8B", LBACK, 8, -1 }, { "9B", LBACK, 9, -1 }, { "0F", LFORW, 0, -1 }, { "1F", LFORW, 1, -1 }, { "2F", LFORW, 2, -1 }, { "3F", LFORW, 3, -1 }, { "4F", LFORW, 4, -1 }, { "5F", LFORW, 5, -1 }, { "6F", LFORW, 6, -1 }, { "7F", LFORW, 7, -1 }, { "8F", LFORW, 8, -1 }, { "9F", LFORW, 9, -1 }, }; int mask[] = { MASK1, MASK2, MASK3, MASK4, MASK5 }; int symcmp(Avl*, Avl*); Sym *sym(char*); void main(int argc, char **argv) { int go; char **ap; go = 0; ARGBEGIN { case 'g': go++; break; } ARGEND cinit(); sinit(); fmtinstall('I', Ifmt); vmstart = -1; for(ap = argv; ap < argv+argc; ap++) asmfile(*ap); repl(go); exits(nil); } void sinit(void) { struct Resvd *r; Sym *s; syms = avlcreate(symcmp); for(r = res; r < res + nelem(res); r++) { s = sym(r->name); s->lex = r->lex; s->opc = r->c; s->f = r->f; avlinsert(syms, s); } } int asmfile(char *file) { int fd; if((fd = open(file, OREAD)) == -1) return -1; Binit(&bin, fd, OREAD); line = 1; filename = file; if(setjmp(errjmp) == 0) yyparse(); Bterm(&bin); close(fd); return 0; } int unpack(u32int inst, int *apart, int *ipart, int *fpart) { int opc; opc = V(inst, F(5, 5)); *fpart = V(inst, F(4, 4)); *ipart = V(inst, F(3, 3)); *apart = V(inst, F(0, 2)); return opc; } int Ifmt(Fmt *f) { u32int inst; int i, apart, ipart, fpart, opc, a, b; inst = va_arg(f->args, u32int); opc = unpack(inst, &apart, &ipart, &fpart); for(i = 0; i < nelem(res); i++) { if(res[i].c == opc) break; } UNF(a, b, fpart); if(res[i+1].c != opc || opc == 56) return fmtprint(f, "%s\t%d,%d(%d | %d:%d)", res[i].name, apart, ipart, fpart, a, b); while(res[i].c == opc && i < nelem(res)) { if(res[i].f == fpart) return fmtprint(f, "%s\t%d,%d(%d | %d:%d)", res[i].name, apart, ipart, fpart, a, b); i++; } return fmtprint(f, "%d\t%d,%d(%d | %d:%d)", opc, apart, ipart, fpart, a, b); } Rune getr(void) { static int bol = 1; Rune r; r = Bgetrune(&bin); switch(r) { case '*': if(!bol) break; case '#': skipto('\n'); case '\n': line++; bol = 1; return '\n'; } bol = 0; return r; } void ungetr(Rune r) { if(r == '\n') line--; Bungetrune(&bin); } long yylex(void) { static Rune buf[11]; Rune r, *bp, *ep; static char cbuf[100]; int isnum; if(yydone) return -1; Loop: r = getr(); switch(r) { case Beof: return -1; case '\t': case ' ': goto Loop; case '\n': case '*': case '+': case '-': case ':': case ',': case '(': case ')': case '=': return r; case '/': r = getr(); if(r == '/') return LSS; else ungetr(r); return '/'; case '"': for(bp = buf; bp < buf+5; bp++) { *bp = getr(); } if(getr() != '"') yyerror("Bad string literal\n"); yylval.rbuf = buf; return LSTR; } bp = buf; ep = buf+nelem(buf)-1; isnum = 1; for(;;) { if(runetomix(r) == -1) yyerror("Invalid character %C", r); if(bp == ep) yyerror("Symbol or number too long"); *bp++ = r; if(isnum && (r >= Runeself || !isdigit(r))) isnum = 0; switch(r = getr()) { case Beof: case '\t': case '\n': case '+': case '-': case '*': case ':': case ',': case '(': case ')': case '=': case ' ': case '/': case '#': ungetr(r); *bp = '\0'; goto End; } } End: seprint(cbuf, cbuf+100, "%S", buf); if(isnum) { yylval.lval = strtol(cbuf, nil, 10); return LNUM; } yylval.sym = sym(cbuf); return yylval.sym->lex; } Sym* getsym(char *name) { Sym *s; s = emallocz(sizeof(*s) + strlen(name)); strcpy(s->nbuf, name); s->name = s->nbuf; s->lex = LSYMREF; return s; } Sym* sym(char *name) { Sym *s, l; l.name = name; s = (Sym*)avllookup(syms, &l, 0); if(s != nil) return s; s = getsym(name); avlinsert(syms, s); return s; } int symcmp(Avl *a, Avl *b) { Sym *sa, *sb; sa = (Sym*)a; sb = (Sym*)b; return strcmp(sa->name, sb->name); } void skipto(char c) { Rune r; for(;;) { r = Bgetrune(&bin); if(r != c && r != Beof) continue; return; } } int mval(u32int a, int s, u32int m) { int sign, val; sign = a >> 31; val = a>>s*BITS & m; if(sign) return -val; return val; } int V(u32int w, int f) { int a, b, d; if(f == 0) return 0; UNF(a, b, f); if(a > 0) w &= ~SIGNB; else a++; d = b - a; if(a > 5 || b > 5 || d < 0 || d > 4) vmerror("Invalid fpart %d", f); return mval(w, 5-b, mask[d]); } int M(int a, int i) { int off, r; r = ri[i] & ~(MASK3<<2*BITS); off = i == 0 ? 0 : mval(r, 0, MASK2); return a + off; } void mixfadd(int){} void mixadd(int m, int f) { int rval; rval = mval(ra, 0, MASK5); rval += V(cells[m], f); ra = rval < 0 ? -rval|SIGNB : rval; if(ra & OVERB) { ra &= ~OVERB; ot = 1; } } void mixfsub(int){} void mixsub(int m, int f) { int rval; rval = mval(ra, 0, MASK5); rval -= V(cells[m], f); ra = rval < 0 ? -rval|SIGNB : rval; if(ra & OVERB) { ra &= ~OVERB; ot = 1; } } void mixfmul(int){} void mixmul(int m, int f) { vlong rval; int signb; rval = mval(ra, 0, MASK5); rval *= V(cells[m], f); if(rval < 0) { rval = -rval; signb = SIGNB; } else signb = 0; ra = rval>>5*BITS & MASK5 | signb; rx = rval & MASK5 | signb; } void mixfdiv(int){} void mixdiv(int m, int f) { vlong rax, quot; u32int xsignb, asignb; int rem, v; v = V(cells[m], f); if(v == 0) { ot = 1; return; } rax = ra & MASK5; rax <<= 5 * BITS; rax |= rx & MASK5; if(ra >> 31) rax = -rax; quot = rax / v; rem = rax % v; if(quot < 0) { quot = -quot; asignb = SIGNB; } else asignb = 0; if(rem < 0) { rem = -rem; xsignb = SIGNB; } else xsignb = 0; if(quot & ~MASK5) ot = 1; ra = quot & MASK5 | asignb; rx = rem & MASK5 | xsignb; } void mixnum(void) { int i, b; u32int n; n = 0; for(i = 0; i < 5; i++) { b = ra>>(4-i)*BITS & MASK1; b %= 10; n = 10*n + b; } for(i = 0; i < 5; i++) { b = rx>>(4-i)*BITS & MASK1; b %= 10; n = 10*n + b; } ra &= ~MASK5; ra |= n & MASK5; } void mixchar(void) { int i; u32int a, val; val = ra & ~SIGNB; for(i = 0; i < 5; i++) { a = val % 10; a += 30; rx &= ~(MASK1 << i*BITS); rx |= a << i*BITS; val /= 10; } for(i = 0; i < 5; i++) { a = val % 10; a += 30; ra &= ~(MASK1 << i*BITS); ra |= a << i*BITS; val /= 10; } } void mixslra(int m, int left) { u32int val; if(m < 0) vmerror("Bad shift A %d", m); if(m > 4) { ra &= ~MASK5; return; } val = ra & MASK5; ra &= ~MASK5; if(left) val <<= m * BITS; else val >>= m * BITS; ra |= val & MASK5; } void mixslrax(int m, int left) { u64int rax; if(m < 0) vmerror("Bad shift AX %d", m); if(m > 9) { ra &= ~MASK5; rx &= ~MASK5; return; } rax = ra & MASK5; ra &= ~MASK5; rax <<= 5 * BITS; rax |= rx & MASK5; rx &= ~MASK5; if(left) rax <<= m; else rax >>= m; rx |= rax & MASK5; ra |= rax>>5*BITS & MASK5; } void mixslc(int m) { u64int rax, s; if(m < 0) vmerror("Bad shift SLC %d", m); m %= 10; rax = ra & MASK5; ra &= ~MASK5; rax <<= 5 * BITS; rax |= rx & MASK5; rx &= ~MASK5; s = rax & mask[m]<<10-m; rax <<= m; rax &= ~mask[m]; rax |= s; rx |= rax & MASK5; ra |= rax>>5*BITS & MASK5; } void mixsrc(int m) { u64int rax, s; if(m < 0) vmerror("Bad shift SRC %d", m); m %= 10; rax = ra & MASK5; ra &= ~MASK5; rax <<= 5 * BITS; rax |= rx & MASK5; rx &= ~MASK5; s = rax & mask[m]; rax >>= m; rax &= ~mask[m] << 10-m; rax |= s<<10-m; rx |= rax & MASK5; ra |= rax>>5*BITS & MASK5; } void mixmove(int s, int f) { int d; if(f == 0) return; d = mval(ri[1], 0, MASK2); if(d < 0 || d > 4000) vmerror("Bad address MOVE %d", d); memcpy(cells+d, cells+s, f*sizeof(u32int)); d += f; d &= MASK2; ri[1] = d < 0 ? -d|SIGNB : d; } u32int mixld(u32int v, int f) { u32int w; int a, b, d; if(f == 5) return v; UNF(a, b, f); w = 0; if(a == 0) { if(v >> 31) w = SIGNB; if(b == 0) return w; a++; } d = b - a; if(a > 5 || b > 5 || d < 0 || d > 4) vmerror("Bad fpart (%d:%d)", a, b); v &= mask[d] << (5-b) * BITS; v >>= (5-b) * BITS; return w | v; } u32int mixst(u32int w, u32int v, int f) { int a, b, d; if(f == 5) return v; UNF(a, b, f); if(a == 0) { w = v>>31 ? w|SIGNB : w&~SIGNB; if(b == 0) return w; a++; } d = b - a; if(a > 5 || b > 5 || d < 0 || d > 4) vmerror("Bad fpart (%d:%d)", a, b); v &= mask[d]; v <<= (5-b) * BITS; w &= ~(mask[d] << (5-b)*BITS); return w | v; } int mixjbus(int /*m*/, int /*f*/, int ip) { return ip+1; } void mixioc(int, int f) { switch(f) { case 18: case 19: print("\n"); break; } } void mixin(int, int){} void mixout(int m, int f) { switch(f) { case 18: mixprint(m, 24); break; case 19: mixprint(m, 14); break; } } int mixjred(int m, int /*f*/, int /*ip*/) { return m; } int mixjmp(int m, int ip) { ri[0] = ip+1 & MASK2; return m; } int mixjov(int m, int ip) { if(ot) { ot = 0; ri[0] = ip+1 & MASK2; return m; } return ip + 1; } int mixjnov(int m, int ip) { if(ot) { ot = 0; return ip + 1; } ri[0] = ip+1 & MASK2; return m; } int mixjc(int m, int ip, int c1, int c2) { if(c1 || c2) { ri[0] = ip+1 & MASK2; return m; } return ip + 1; } int mixjaxic(int m, int ip, u32int r, u32int msk, int f) { int v, c; v = mval(r, 0, msk); switch(f) { default: vmerror("Bad instruction JA condition: %d", f); case 0: c = v < 0; break; case 1: c = v == 0; break; case 2: c = v > 0; break; case 3: c = v >= 0; break; case 4: c = v != 0; break; case 5: c = v <= 0; break; } if(c) { ri[0] = ip+1 & MASK2; return m; } return ip + 1; } void mixinc(int m, u32int *r) { int v; v = mval(*r, 0, MASK5); v += m; *r = v < 0 ? -v|SIGNB : v; } void mixfcmp(void){} void mixcmp(int m, int f, u32int r) { int v1, v2; ce = cg = cl = 0; v1 = V(r, f); v2 = V(cells[m], f); if(v1 < v2) cl = 1; else if(v1 > v2) cg = 1; else ce = 1; } int mixvm(int ip, int once) { u32int r; int a, i, f, c, m, inst; curpc = ip; for (;;) { if(curpc < 0 || curpc > 4000) vmerror("Bad PC %d", curpc); if(bp[curpc] && !once) return curpc; inst = cells[curpc]; a = V(inst, F(0, 2)); i = V(inst, F(3, 3)); f = V(inst, F(4, 4)); c = V(inst, F(5, 5)); m = M(a, i); switch(c) { default: fprint(2, "Bad op!\n"); exits("error"); case 0: break; case 1: if(f == 6) mixfadd(inst); else mixadd(m, f); break; case 2: if(f == 6) mixfsub(inst); else mixsub(m, f); break; case 3: if(f == 6) mixfmul(inst); else mixmul(m, f); break; case 4: if(f == 6) mixfdiv(inst); else mixdiv(m, f); break; case 5: switch(f) { default: vmerror("Bad instruction NUM or CHAR: %d", f); case 0: mixnum(); break; case 1: mixchar(); break; case 2: return -1; /* HLT */ } break; case 6: switch(f) { default: vmerror("Bad instruction shift: %d", f); case 0: mixslra(m, 1); break; case 1: mixslra(m, 0); break; case 2: mixslrax(m, 1); break; case 4: mixslrax(m, 0); break; case 5: mixslc(m); break; case 6: mixsrc(m); break; } break; case 7: mixmove(m, f); break; case 8: ra = mixld(cells[m], f); break; case 9: case 10: case 11: case 12: case 13: case 14: ri[c-8] = mixld(cells[m], f); break; case 15: rx = mixld(cells[m], f); break; case 16: ra = mixld(cells[m], f) ^ SIGNB; break; case 17: case 18: case 19: case 20: case 21: case 22: ri[c-16] = mixld(cells[m], f) ^ SIGNB; break; case 23: rx = mixld(cells[m], f) ^ SIGNB; break; case 24: cells[m] = mixst(cells[m], ra, f); break; case 25: case 26: case 27: case 28: case 29: case 30: r = ri[c-24] & ~(MASK3 << 2*BITS); cells[m] = mixst(cells[m], r, f); break; case 31: cells[m] = mixst(cells[m], rx, f); break; case 32: r = ri[0] & ~(MASK3 << 2*BITS); cells[m] = mixst(cells[m], r, f); break; case 33: cells[m] = mixst(cells[m], 0, f); break; case 34: curpc = mixjbus(m, f, curpc); goto Again; case 35: mixioc(m, f); break; case 36: mixin(m, f); break; case 37: mixout(m, f); break; case 38: curpc = mixjred(m, f, curpc); break; case 39: switch(f) { default: vmerror("Bad jmp instruction: %d", f); case 0: curpc = mixjmp(m, curpc); break; case 1: curpc = m; break; /* JSJ */ case 2: curpc = mixjov(m, curpc); break; case 3: curpc = mixjnov(m, curpc); break; case 4: curpc = mixjc(m, curpc, cl, 0); break; case 5: curpc = mixjc(m, curpc, ce, 0); break; case 6: curpc = mixjc(m, curpc, cg, 0); break; case 7: curpc = mixjc(m, curpc, cg, ce); break; case 8: curpc = mixjc(m, curpc, cl, cg); break; case 9: curpc = mixjc(m, curpc, cl, ce); break; } goto Again; case 40: curpc = mixjaxic(m, curpc, ra, MASK5, f); goto Again; case 41: case 42: case 43: case 44: case 45: case 46: curpc = mixjaxic(m, curpc, ri[c-40], MASK2, f); goto Again; case 47: curpc = mixjaxic(m, curpc, rx, MASK5, f); goto Again; case 48: switch(f) { case 0: mixinc(m, &ra); break; case 1: mixinc(-m, &ra); break; case 2: ra = m == 0 ? inst & SIGNB : m < 0 ? -m|SIGNB : m; break; /* ENTA */ case 3: ra = m == 0 ? ~inst & SIGNB : m > 0 ? m|SIGNB : -m; break; /* ENNA */ } break; case 49: case 50: case 51: case 52: case 53: case 54: switch(f) { case 0: mixinc(m, ri+(c-48)); break; case 1: mixinc(-m, ri+(c-48)); break; case 2: ri[c-48] = m == 0 ? inst & SIGNB : m < 0 ? -m|SIGNB : m; break; /* ENT[1-6] */ case 3: ri[c-48] = m == 0 ? ~inst & SIGNB : m > 0 ? m|SIGNB : -m; break; /* ENN[1-6] */ } break; case 55: switch(f) { case 0: mixinc(m, &rx); break; case 1: mixinc(-m, &rx); break; case 2: rx = m == 0 ? inst & SIGNB : m < 0 ? -m|SIGNB : m; break; /* ENTX */ case 3: rx = m == 0 ? ~inst & SIGNB : m > 0 ? m|SIGNB : -m; break; /* ENNX */ } break; case 56: if(f == 6) mixfcmp(); else mixcmp(m, f, ra); break; case 57: case 58: case 59: case 60: case 61: case 62: mixcmp(m, f, ri[c-56] & ~(MASK3<<2*BITS)); break; case 63: mixcmp(m, f, rx); break; } curpc++; Again: if(once) return curpc; } }