ref: eed13a5c22662fe4c77b8587e7a53c9b1ae96acb
dir: /sys/src/cmd/7c/txt.c/
#include "gc.h"
void
ginit(void)
{
Type *t;
thechar = '7';
thestring = "alpha";
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];
typeword = typechlvp;
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];
constnode.op = OCONST;
constnode.class = CXXX;
constnode.complex = 0;
constnode.addable = 20;
constnode.type = types[TLONG];
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);
memset(reg, 0, sizeof(reg));
reg[REGZERO] = 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+=2)
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(typesu[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 != NREG && curarg == 0 &&
(typechlp[n->type->etype] || typev[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*
nodconst(long v)
{
constnode.vconst = v;
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]++;
}
void
regalloc(Node *n, Node *tn, Node *o)
{
int i, j;
static int lasti;
switch(tn->type->etype) {
case TCHAR:
case TUCHAR:
case TSHORT:
case TUSHORT:
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TIND:
case TVLONG:
case TUVLONG:
if(o != Z && o->op == OREGISTER) {
i = o->reg;
if(i >= 0 && i < NREG - 1)
goto out;
}
j = lasti + REGRET+1;
for(i=REGRET+1; i<NREG; i++) {
if(j >= NREG)
j = REGRET+1;
if(reg[j] == 0) {
i = j;
goto out;
}
j++;
}
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;
}
j = NREG + 12 + lasti;
for(i=NREG; i<NREG+NREG; i++) {
if(j >= NREG+NREG)
j = NREG;
if(reg[j] == 0) {
i = j;
goto out;
}
j++;
}
diag(tn, "out of float registers");
goto err;
}
diag(tn, "unknown type in regalloc: %T", tn->type);
err:
i = -1;
out:
if(i >= 0)
reg[i]++;
lasti++;
if(lasti >= 5)
lasti = 0;
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 >= sizeof(reg))
goto err;
if(reg[i] <= 0)
goto err;
reg[i]--;
return;
err:
diag(n, "error in regfree: %d op %O", i, n->op);
}
void
regsalloc(Node *n, Node *nn)
{
cursafe = align(cursafe, nn->type, Aaut3);
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 + SZ_VLONG;
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)
{
vlong 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 if(typev[n->type->etype]) {
a->type = D_CONST;
a->offset = n->vconst;
} else {
a->type = D_CONST;
a->offset = convvtox(n->vconst, TLONG); /* alpha arithmetic */
}
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(ft == TDOUBLE && f->op == OCONST) {
d = f->fconst;
if(d == 0.0) {
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 = AMOVL;
break;
case TVLONG:
case TUVLONG:
/* todo: optimise freg case? */
a = AMOVQ;
#ifdef is_this_right
if(typefd[tt]) {
/* special case can load mem to Freg */
regalloc(&nod, t, t);
gins(AMOVL, f, &nod);
a = ACVTQT;
if(tt == TFLOAT)
a = ACVTQS;
gins(a, &nod, &nod);
gmove(&nod, t);
regfree(&nod);
return;
}
#endif is_this_right
break;
case TFLOAT:
a = AMOVS;
break;
case TDOUBLE:
a = AMOVT;
break;
case TCHAR:
a = AMOVB;
break;
case TUCHAR:
a = AMOVBU;
break;
case TSHORT:
a = AMOVW;
break;
case TUSHORT:
a = AMOVWU;
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 = AMOVL;
break;
case TUCHAR:
case TCHAR:
a = AMOVB;
break;
case TUSHORT:
case TSHORT:
a = AMOVW;
break;
case TFLOAT:
a = AMOVS;
break;
case TDOUBLE:
a = AMOVT;
break;
case TVLONG:
case TUVLONG:
a = AMOVQ;
break;
}
if(!typefd[ft] && vconst(f) == 0) {
gins(a, f, t);
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 = AMOVT;
break;
case TFLOAT:
a = ACVTTS;
if(ft == TFLOAT)
a = AMOVT;
break;
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TUVLONG:
case TVLONG:
case TIND:
case TSHORT:
case TUSHORT:
case TCHAR:
case TUCHAR:
/*warn(Z, "float to fix"); /**/
regalloc(&nod, f, Z); /* should be type float */
gins(ACVTTQ, f, &nod);
gins(AMOVT, &nod, nodrat);
regfree(&nod);
gins(AMOVQ, nodrat, t);
gmove(t, t);
if(nrathole < SZ_VLONG)
nrathole = SZ_VLONG;
return;
}
break;
case TVLONG:
case TUVLONG:
switch(tt) {
case TDOUBLE:
case TFLOAT:
goto fxtofl;
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TIND:
case TSHORT:
case TUSHORT:
case TCHAR:
case TUCHAR:
a = AMOVL;
break;
case TVLONG:
case TUVLONG:
a = AMOVQ;
break;
}
break;
case TINT:
case TUINT:
case TULONG:
case TLONG:
case TIND:
switch(tt) {
case TDOUBLE:
case TFLOAT:
goto fxtofl;
case TVLONG:
case TUVLONG:
if (ft == TULONG || ft == TUINT) {
a = AMOVLU;
break;
}
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TIND:
case TSHORT:
case TUSHORT:
case TCHAR:
case TUCHAR:
a = AMOVQ;
break;
}
break;
case TSHORT:
switch(tt) {
case TDOUBLE:
case TFLOAT:
goto fxtofl;
case TINT:
case TUINT:
case TULONG:
case TLONG:
case TVLONG:
case TUVLONG:
case TIND:
a = AMOVW;
break;
case TSHORT:
case TUSHORT:
case TCHAR:
case TUCHAR:
a = AMOVQ;
break;
}
break;
case TUSHORT:
switch(tt) {
case TDOUBLE:
case TFLOAT:
goto fxtofl;
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TVLONG:
case TUVLONG:
case TIND:
a = AMOVWU;
break;
case TSHORT:
case TUSHORT:
case TCHAR:
case TUCHAR:
a = AMOVQ;
break;
}
break;
case TCHAR:
switch(tt) {
case TDOUBLE:
case TFLOAT:
goto fxtofl;
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TVLONG:
case TUVLONG:
case TIND:
case TSHORT:
case TUSHORT:
a = AMOVB;
break;
case TCHAR:
case TUCHAR:
a = AMOVQ;
break;
}
break;
case TUCHAR:
switch(tt) {
case TDOUBLE:
case TFLOAT:
fxtofl:
/*warn(Z, "fix to float"); /**/
regalloc(&nod, t, Z); /* should be type float */
gins(AMOVQ, f, nodrat);
gins(AMOVT, nodrat, &nod);
a = ACVTQT;
if(tt == TFLOAT)
a = ACVTQS;
gins(a, &nod, t);
regfree(&nod);
if(nrathole < SZ_VLONG)
nrathole = SZ_VLONG;
return;
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TVLONG:
case TUVLONG:
case TIND:
case TSHORT:
case TUSHORT:
a = AMOVBU;
break;
case TCHAR:
case TUCHAR:
a = AMOVQ;
break;
}
break;
}
if(a == AMOVQ || a == AMOVS || a == AMOVT)
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, et;
Adr ta;
Node nod;
et = TLONG;
if(f1 != Z && f1->type != T) {
if(f1->op == OCONST && t != Z && t->type != T)
et = t->type->etype;
else
et = f1->type->etype;
}
a = AGOK;
switch(o) {
case OAS:
gmove(f1, t);
return;
case OASADD:
case OADD:
a = AADDL;
if(et == TFLOAT)
a = AADDS;
else
if(et == TDOUBLE)
a = AADDT;
else
if(et == TVLONG || et == TUVLONG)
a = AADDQ;
break;
case OASSUB:
case OSUB:
a = ASUBL;
if(et == TFLOAT)
a = ASUBS;
else
if(et == TDOUBLE)
a = ASUBT;
else
if(et == TVLONG || et == TUVLONG)
a = ASUBQ;
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 = ASRLL;
if(et == TVLONG || et == TUVLONG)
a = ASRLQ;
break;
case OASASHR:
case OASHR:
a = ASRAL;
if(et == TVLONG || et == TUVLONG)
a = ASRAQ;
break;
case OASASHL:
case OASHL:
a = ASLLL;
if(et == TVLONG || et == TUVLONG)
a = ASLLQ;
break;
case OFUNC:
a = AJSR;
break;
case OASLMUL:
case OLMUL:
case OASMUL:
case OMUL:
a = AMULL;
if(et == TFLOAT)
a = AMULS;
else
if(et == TDOUBLE)
a = AMULT;
else
if(et == TVLONG || et == TUVLONG)
a = AMULQ;
break;
case OASDIV:
case ODIV:
a = ADIVL;
if(et == TFLOAT)
a = ADIVS;
else
if(et == TDOUBLE)
a = ADIVT;
else
if(et == TVLONG || et == TUVLONG)
a = ADIVQ;
break;
case OASMOD:
case OMOD:
a = AMODL;
if(et == TVLONG || et == TUVLONG)
a = AMODQ;
break;
case OASLMOD:
case OLMOD:
a = AMODLU;
if(et == TVLONG || et == TUVLONG)
a = AMODQU;
break;
case OASLDIV:
case OLDIV:
a = ADIVLU;
if(et == TVLONG || et == TUVLONG)
a = ADIVQU;
break;
case OEQ:
case ONE:
a = ACMPEQ;
if(typefd[et])
a = ACMPTEQ;
else if (vconst(t) == 0) {
a = (o == OEQ) ? ABEQ : ABNE;
t = Z;
break;
}
goto cmp;
case OLT:
case OGE:
a = ACMPGT;
if(typefd[et])
a = ACMPTGT;
else if (vconst(t) == 0) {
a = (o == OLT) ? ABLT : ABGE;
t = Z;
break;
}
goto cmp;
case OLE:
case OGT:
a = ACMPGE;
if(typefd[et])
a = ACMPTGE;
else
if(vconst(t) == 0) {
a = (o == OLE)? ABLE: ABGT;
t = Z;
break;
}
goto cmp;
case OLO:
case OHS:
a = ACMPUGT;
goto cmp;
case OLS:
case OHI:
a = ACMPUGE;
goto cmp;
cmp:
nextpc();
p->as = a;
raddr(f1, p);
naddr(t, &p->from);
regalloc(&nod, t, Z);
naddr(&nod, &p->to);
if(debug['g'])
print("%P\n", p);
if(o == OEQ || o == OLT || o == OLE || o == OLO || o == OLS)
a = typefd[et]? AFBNE: ABNE;
else
a = typefd[et]? AFBEQ: ABEQ;
nextpc();
p->as = a;
naddr(&nod, &p->from);
regfree(&nod);
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);
}
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 >= -32766LL && vv < 32766LL)
return 1;
}
}
return 0;
}
int
sval(long v)
{
if(v >= -32766L && v < 32766L)
return 1;
return 0;
}
int
bval(vlong v)
{
if(v >= 0LL && v < 256LL)
return 1;
return 0;
}
int
bconst(Node *n)
{
vlong vv;
if(n->op == OCONST) {
if(!typefd[n->type->etype]) {
vv = n->vconst;
if(vv >= 0LL && vv < 256LL)
return 1;
}
}
return 0;
}
long
exreg(Type *t)
{
long o;
if(typechlp[t->etype]) {
if(exregoffset <= 12)
return 0;
o = exregoffset;
exregoffset--;
return o;
}
if(typefd[t->etype]) {
if(exfregoffset <= 19)
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] */
SZ_IND, /* [TIND] */
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] */
};