void
cgen(Node *n, Node *nn)
{
Node *l, *r, *t;
Prog *p1;
Node nod, nod1, nod2, nod3, nod4;
int o, hardleft;
int32 v, curs;
vlong c;
if(debug['g']) {
prtree(nn, "cgen lhs");
prtree(n, "cgen");
}
if(n == Z || n->type == T)
return;
if(typesu[n->type->etype]) {
sugen(n, nn, n->type->width);
return;
}
l = n->left;
r = n->right;
o = n->op;
if(n->op == OEXREG || (nn != Z && nn->op == OEXREG)) {
gmove(n, nn);
return;
}
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(l->complex >= FNX)
if(r != Z && r->complex >= FNX)
switch(o) {
default:
if(cond(o) && typesu[l->type->etype])
break;
regret(&nod, r);
cgen(r, &nod);
regsalloc(&nod1, r);
gmove(&nod, &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;
}
hardleft = l->addable < INDEXED || l->complex >= FNX;
switch(o) {
default:
diag(n, "unknown op in cgen: %O", o);
break;
case ONEG:
case OCOM:
if(nn == Z) {
nullwarn(l, Z);
break;
}
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, n->type, Z, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
case OAS:
if(l->op == OBIT)
goto bitas;
if(!hardleft) {
if(nn != Z || r->addable < INDEXED || hardconst(r)) {
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) {
if(l->op == OINDEX && immconst(r)) {
gmove(r, l);
break;
}
reglcgen(&nod1, l, Z);
if(r->addable >= INDEXED && !hardconst(r)) {
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);
gmove(&nod1, &nod2);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
case OBIT:
if(nn == Z) {
nullwarn(l, Z);
break;
}
bitload(n, &nod, Z, Z, nn);
gmove(&nod, nn);
regfree(&nod);
break;
case OLSHR:
case OASHL:
case OASHR:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(r->op == OCONST) {
if(r->vconst == 0) {
cgen(l, nn);
break;
}
regalloc(&nod, l, nn);
cgen(l, &nod);
if(o == OASHL && r->vconst == 1)
gopcode(OADD, n->type, &nod, &nod);
else
gopcode(o, n->type, r, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
/*
* get nod to be D_CX
*/
if(nodreg(&nod, nn, D_CX)) {
regsalloc(&nod1, n);
gmove(&nod, &nod1);
cgen(n, &nod); /* probably a bug */
gmove(&nod, nn);
gmove(&nod1, &nod);
break;
}
reg[D_CX]++;
if(nn->op == OREGISTER && nn->reg == D_CX)
regalloc(&nod1, l, Z);
else
regalloc(&nod1, l, nn);
if(r->complex >= l->complex) {
cgen(r, &nod);
cgen(l, &nod1);
} else {
cgen(l, &nod1);
cgen(r, &nod);
}
gopcode(o, n->type, &nod, &nod1);
gmove(&nod1, nn);
regfree(&nod);
regfree(&nod1);
break;
case OADD:
case OSUB:
case OOR:
case OXOR:
case OAND:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(typefd[n->type->etype])
goto fop;
if(r->op == OCONST) {
if(r->vconst == 0 && o != OAND) {
cgen(l, nn);
break;
}
}
if(n->op == OADD && l->op == OASHL && l->right->op == OCONST
&& (r->op != OCONST || r->vconst < -128 || r->vconst > 127)) {
c = l->right->vconst;
if(c > 0 && c <= 3) {
if(l->left->complex >= r->complex) {
regalloc(&nod, l->left, nn);
cgen(l->left, &nod);
if(r->addable < INDEXED) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
genmuladd(&nod, &nod, 1 << c, &nod1);
regfree(&nod1);
}
else
genmuladd(&nod, &nod, 1 << c, r);
}
else {
regalloc(&nod, r, nn);
cgen(r, &nod);
regalloc(&nod1, l->left, Z);
cgen(l->left, &nod1);
genmuladd(&nod, &nod1, 1 << c, &nod);
regfree(&nod1);
}
gmove(&nod, nn);
regfree(&nod);
break;
}
}
if(r->addable >= INDEXED && !hardconst(r)) {
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, n->type, r, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
if(l->complex >= r->complex) {
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, r, Z);
cgen(r, &nod1);
gopcode(o, n->type, &nod1, &nod);
} else {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
regalloc(&nod, l, Z);
cgen(l, &nod);
gopcode(o, n->type, &nod1, &nod);
}
gmove(&nod, nn);
regfree(&nod);
regfree(&nod1);
break;
case OLMOD:
case OMOD:
case OLMUL:
case OLDIV:
case OMUL:
case ODIV:
if(nn == Z) {
nullwarn(l, r);
break;
}
if(typefd[n->type->etype])
goto fop;
if(r->op == OCONST && typechl[n->type->etype]) { /* TO DO */
SET(v);
switch(o) {
case ODIV:
case OMOD:
c = r->vconst;
if(c < 0)
c = -c;
v = xlog2(c);
if(v < 0)
break;
/* fall thru */
case OMUL:
case OLMUL:
regalloc(&nod, l, nn);
cgen(l, &nod);
switch(o) {
case OMUL:
case OLMUL:
mulgen(n->type, r, &nod);
break;
case ODIV:
sdiv2(r->vconst, v, l, &nod);
break;
case OMOD:
smod2(r->vconst, v, l, &nod);
break;
}
gmove(&nod, nn);
regfree(&nod);
goto done;
case OLDIV:
c = r->vconst;
if((c & 0x80000000) == 0)
break;
regalloc(&nod1, l, Z);
cgen(l, &nod1);
regalloc(&nod, l, nn);
zeroregm(&nod);
gins(ACMPL, &nod1, nodconst(c));
gins(ASBBL, nodconst(-1), &nod);
regfree(&nod1);
gmove(&nod, nn);
regfree(&nod);
goto done;
}
}
if(o == OMUL) {
if(l->addable >= INDEXED) {
t = l;
l = r;
r = t;
}
/* should favour AX */
regalloc(&nod, l, nn);
cgen(l, &nod);
if(r->addable < INDEXED || hardconst(r)) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
gopcode(OMUL, n->type, &nod1, &nod);
regfree(&nod1);
}else
gopcode(OMUL, n->type, r, &nod); /* addressible */
gmove(&nod, nn);
regfree(&nod);
break;
}
/*
* get nod to be D_AX
* get nod1 to be D_DX
*/
if(nodreg(&nod, nn, D_AX)) {
regsalloc(&nod2, n);
gmove(&nod, &nod2);
v = reg[D_AX];
reg[D_AX] = 0;
if(isreg(l, D_AX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_AX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod);
reg[D_AX] = v;
break;
}
if(nodreg(&nod1, nn, D_DX)) {
regsalloc(&nod2, n);
gmove(&nod1, &nod2);
v = reg[D_DX];
reg[D_DX] = 0;
if(isreg(l, D_DX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_DX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod1);
reg[D_DX] = v;
break;
}
reg[D_AX]++;
if(r->op == OCONST && (o == ODIV || o == OLDIV) && immconst(r) && typechl[r->type->etype]) {
reg[D_DX]++;
if(l->addable < INDEXED) {
regalloc(&nod2, l, Z);
cgen(l, &nod2);
l = &nod2;
}
if(o == ODIV)
sdivgen(l, r, &nod, &nod1);
else
udivgen(l, r, &nod, &nod1);
gmove(&nod1, nn);
if(l == &nod2)
regfree(l);
goto freeaxdx;
}
if(l->complex >= r->complex) {
cgen(l, &nod);
reg[D_DX]++;
if(o == ODIV || o == OMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OLDIV || o == OLMOD)
zeroregm(&nod1);
if(r->addable < INDEXED || r->op == OCONST) {
regsalloc(&nod3, r);
cgen(r, &nod3);
gopcode(o, n->type, &nod3, Z);
} else
gopcode(o, n->type, r, Z);
} else {
regsalloc(&nod3, r);
cgen(r, &nod3);
cgen(l, &nod);
reg[D_DX]++;
if(o == ODIV || o == OMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OLDIV || o == OLMOD)
zeroregm(&nod1);
gopcode(o, n->type, &nod3, Z);
}
if(o == OMOD || o == OLMOD)
gmove(&nod1, nn);
else
gmove(&nod, nn);
freeaxdx:
regfree(&nod);
regfree(&nod1);
break;
case OASLSHR:
case OASASHL:
case OASASHR:
if(r->op == OCONST)
goto asand;
if(l->op == OBIT)
goto asbitop;
if(typefd[n->type->etype])
goto asand; /* can this happen? */
/*
* get nod to be D_CX
*/
if(nodreg(&nod, nn, D_CX)) {
regsalloc(&nod1, n);
gmove(&nod, &nod1);
cgen(n, &nod);
if(nn != Z)
gmove(&nod, nn);
gmove(&nod1, &nod);
break;
}
reg[D_CX]++;
if(r->complex >= l->complex) {
cgen(r, &nod);
if(hardleft)
reglcgen(&nod1, l, Z);
else
nod1 = *l;
} else {
if(hardleft)
reglcgen(&nod1, l, Z);
else
nod1 = *l;
cgen(r, &nod);
}
gopcode(o, l->type, &nod, &nod1);
regfree(&nod);
if(nn != Z)
gmove(&nod1, nn);
if(hardleft)
regfree(&nod1);
break;
case OASAND:
case OASADD:
case OASSUB:
case OASXOR:
case OASOR:
asand:
if(l->op == OBIT)
goto asbitop;
if(typefd[l->type->etype] || typefd[r->type->etype])
goto asfop;
if(l->complex >= r->complex) {
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(!immconst(r)) {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
gopcode(o, l->type, &nod1, &nod);
regfree(&nod1);
} else
gopcode(o, l->type, r, &nod);
} else {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
gopcode(o, l->type, &nod1, &nod);
regfree(&nod1);
}
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod);
break;
asfop:
if(l->complex >= r->complex) {
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(r->addable < INDEXED){
regalloc(&nod1, r, nn);
cgen(r, &nod1);
}else
nod1 = *r;
regalloc(&nod2, r, Z);
gmove(&nod, &nod2);
gopcode(o, r->type, &nod1, &nod2);
gmove(&nod2, &nod);
regfree(&nod2);
if(r->addable < INDEXED)
regfree(&nod1);
} else {
regalloc(&nod1, r, nn);
cgen(r, &nod1);
if(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(o != OASMUL && o != OASADD) {
regalloc(&nod2, r, Z);
gmove(&nod, &nod2);
gopcode(o, r->type, &nod1, &nod2);
regfree(&nod1);
gmove(&nod2, &nod);
regfree(&nod2);
} else {
gopcode(o, r->type, &nod, &nod1);
gmove(&nod1, &nod);
regfree(&nod1);
}
}
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod);
break;
case OASLMUL:
case OASLDIV:
case OASLMOD:
case OASMUL:
case OASDIV:
case OASMOD:
if(l->op == OBIT)
goto asbitop;
if(typefd[n->type->etype] || typefd[r->type->etype])
goto asfop;
if(r->op == OCONST && typechl[n->type->etype]) {
SET(v);
switch(o) {
case OASDIV:
case OASMOD:
c = r->vconst;
if(c < 0)
c = -c;
v = xlog2(c);
if(v < 0)
break;
/* fall thru */
case OASMUL:
case OASLMUL:
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn);
cgen(&nod2, &nod);
switch(o) {
case OASMUL:
case OASLMUL:
mulgen(n->type, r, &nod);
break;
case OASDIV:
sdiv2(r->vconst, v, l, &nod);
break;
case OASMOD:
smod2(r->vconst, v, l, &nod);
break;
}
havev:
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod2);
regfree(&nod);
goto done;
case OASLDIV:
c = r->vconst;
if((c & 0x80000000) == 0)
break;
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod1, l, nn);
cgen(&nod2, &nod1);
regalloc(&nod, l, nn);
zeroregm(&nod);
gins(ACMPL, &nod1, nodconst(c));
gins(ASBBL, nodconst(-1), &nod);
regfree(&nod1);
goto havev;
}
}
if(o == OASMUL) {
/* should favour AX */
regalloc(&nod, l, nn);
if(r->complex >= FNX) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
r = &nod1;
}
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
cgen(&nod2, &nod);
if(r->addable < INDEXED || hardconst(r)) {
if(r->complex < FNX) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
}
gopcode(OASMUL, n->type, &nod1, &nod);
regfree(&nod1);
}
else
gopcode(OASMUL, n->type, r, &nod);
if(r == &nod1)
regfree(r);
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
regfree(&nod);
if(hardleft)
regfree(&nod2);
break;
}
/*
* get nod to be D_AX
* get nod1 to be D_DX
*/
if(nodreg(&nod, nn, D_AX)) {
regsalloc(&nod2, n);
gmove(&nod, &nod2);
v = reg[D_AX];
reg[D_AX] = 0;
if(isreg(l, D_AX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_AX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod);
reg[D_AX] = v;
break;
}
if(nodreg(&nod1, nn, D_DX)) {
regsalloc(&nod2, n);
gmove(&nod1, &nod2);
v = reg[D_DX];
reg[D_DX] = 0;
if(isreg(l, D_DX)) {
nod3 = *n;
nod3.left = &nod2;
cgen(&nod3, nn);
} else
if(isreg(r, D_DX)) {
nod3 = *n;
nod3.right = &nod2;
cgen(&nod3, nn);
} else
cgen(n, nn);
gmove(&nod2, &nod1);
reg[D_DX] = v;
break;
}
reg[D_AX]++;
reg[D_DX]++;
if(l->complex >= r->complex) {
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
cgen(&nod2, &nod);
if(r->op == OCONST && typechl[r->type->etype]) {
switch(o) {
case OASDIV:
sdivgen(&nod2, r, &nod, &nod1);
goto divdone;
case OASLDIV:
udivgen(&nod2, r, &nod, &nod1);
divdone:
gmove(&nod1, &nod2);
if(nn != Z)
gmove(&nod1, nn);
goto freelxaxdx;
}
}
if(o == OASDIV || o == OASMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OASLDIV || o == OASLMOD)
zeroregm(&nod1);
if(r->addable < INDEXED || r->op == OCONST ||
!typeil[r->type->etype]) {
regalloc(&nod3, r, Z);
cgen(r, &nod3);
gopcode(o, l->type, &nod3, Z);
regfree(&nod3);
} else
gopcode(o, n->type, r, Z);
} else {
regalloc(&nod3, r, Z);
cgen(r, &nod3);
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
cgen(&nod2, &nod);
if(o == OASDIV || o == OASMOD)
gins(typechl[l->type->etype]? ACDQ: ACQO, Z, Z);
if(o == OASLDIV || o == OASLMOD)
zeroregm(&nod1);
gopcode(o, l->type, &nod3, Z);
regfree(&nod3);
}
if(o == OASMOD || o == OASLMOD) {
gmove(&nod1, &nod2);
if(nn != Z)
gmove(&nod1, nn);
} else {
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
}
freelxaxdx:
if(hardleft)
regfree(&nod2);
regfree(&nod);
regfree(&nod1);
break;
fop:
if(l->complex >= r->complex) {
regalloc(&nod, l, nn);
cgen(l, &nod);
if(r->addable < INDEXED) {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
gopcode(o, n->type, &nod1, &nod);
regfree(&nod1);
} else
gopcode(o, n->type, r, &nod);
} else {
/* TO DO: could do better with r->addable >= INDEXED */
regalloc(&nod1, r, Z);
cgen(r, &nod1);
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, n->type, &nod1, &nod);
regfree(&nod1);
}
gmove(&nod, nn);
regfree(&nod);
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);
{ /* TO DO: check floating point source */
Node onod;
/* incredible grot ... */
onod = nod3;
onod.op = o;
onod.complex = 2;
onod.addable = 0;
onod.type = tfield;
onod.left = &nod4;
onod.right = &nod3;
cgen(&onod, Z);
}
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);
gmove(&nod, &nod1);
regfree(&nod);
nod = *n;
nod.left = &nod2;
nod2 = *l;
nod2.left = &nod1;
nod2.complex = 1;
cgen(&nod, nn);
return;
}
o = 0;
if(REGARG >= 0)
o = reg[REGARG];
gargs(r, &nod, &nod1);
if(l->addable < INDEXED) {
reglcgen(&nod, l, nn);
nod.op = OREGISTER;
gopcode(OFUNC, n->type, Z, &nod);
regfree(&nod);
} else
gopcode(OFUNC, n->type, Z, l);
if(REGARG >= 0)
if(o != reg[REGARG])
reg[REGARG]--;
if(nn != Z) {
regret(&nod, n);
gmove(&nod, 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);
gmove(&nod, 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) && nocast(n->type, nn->type)) {
/* both null, gen l->nn */
cgen(l, nn);
break;
}
if(ewidth[n->type->etype] < ewidth[l->type->etype]){
if(l->type->etype == TIND && typechlp[n->type->etype])
warn(n, "conversion of pointer to shorter integer");
}else if(0){
if(nocast(n->type, nn->type) || castup(n->type, nn->type)){
if(typefd[l->type->etype] != typefd[nn->type->etype])
regalloc(&nod, l, nn);
else
regalloc(&nod, nn, nn);
cgen(l, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
}
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, n, &nod);
gmove(&nod, &nod1);
gmove(&nod1, nn);
regfree(&nod1);
regfree(&nod);
break;
case ODOT:
sugen(l, nodrat, l->type->width);
if(nn == Z)
break;
warn(n, "non-interruptable temporary");
nod = *nodrat;
if(!r || r->op != OCONST) {
diag(n, "DOT and no offset");
break;
}
nod.xoffset += (int32)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(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
gmove(&nod, nn);
if(typefd[n->type->etype]) {
regalloc(&nod1, l, Z);
gmove(&nod, &nod1);
if(v < 0)
gopcode(OSUB, n->type, nodfconst(-v), &nod1);
else
gopcode(OADD, n->type, nodfconst(v), &nod1);
gmove(&nod1, &nod);
regfree(&nod1);
} else
gopcode(OADD, n->type, nodconst(v), &nod);
if(hardleft)
regfree(&nod);
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(hardleft)
reglcgen(&nod, l, Z);
else
nod = *l;
if(typefd[n->type->etype]) {
regalloc(&nod1, l, Z);
gmove(&nod, &nod1);
if(v < 0)
gopcode(OSUB, n->type, nodfconst(-v), &nod1);
else
gopcode(OADD, n->type, nodfconst(v), &nod1);
gmove(&nod1, &nod);
regfree(&nod1);
} else
gopcode(OADD, n->type, nodconst(v), &nod);
if(nn != Z)
gmove(&nod, nn);
if(hardleft)
regfree(&nod);
break;
bitinc:
if(nn != Z && (o == OPOSTINC || o == OPOSTDEC)) {
bitload(l, &nod, &nod1, &nod2, Z);
gmove(&nod, nn);
gopcode(OADD, tfield, nodconst(v), &nod);
bitstore(l, &nod, &nod1, &nod2, Z);
break;
}
bitload(l, &nod, &nod1, &nod2, nn);
gopcode(OADD, tfield, nodconst(v), &nod);
bitstore(l, &nod, &nod1, &nod2, nn);
break;
}
done:
cursafe = curs;
}
void
cgenrel(Node *n, Node *nn, int inrel)
{
Node *l, *r;
Prog *p1;
Node nod, nod1, nod2, nod3, nod4;
int o, t;
long v, curs;
if(debug['g']) {
prtree(nn, "cgen lhs");
prtree(n, "cgen");
}
if(n == Z || n->type == T)
return;
if(typesu[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:
if(cond(o) && typesu[l->type->etype])
break;
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 ONEG:
case OCOM:
if(nn == Z) {
nullwarn(l, Z);
break;
}
regalloc(&nod, l, nn);
cgen(l, &nod);
gopcode(o, &nod, Z, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
case OAS:
if(l->op == OBIT)
goto bitas;
if(l->addable >= INDEXED && l->complex < FNX) {
if(nn != Z || r->addable < INDEXED) { /* || hardconst(r) */
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) {
/* TO DO: see 6c for OINDEX && immconst(r) */
reglcgen(&nod1, l, Z);
if(r->addable >= INDEXED) { /* && !hardconst(r) */
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 ODIV:
case OMOD:
if(nn != Z)
if((t = vlog(r)) >= 0) {
/* signed div/mod by constant power of 2 */
cgen(l, nn);
gopcode(OGE, nodconst(0), nn, Z);
p1 = p;
if(o == ODIV) {
gopcode(OADD, nodconst((1<<t)-1), Z, nn);
patch(p1, pc);
gopcode(OASHR, nodconst(t), Z, nn);
} else {
gopcode(ONEG, nn, Z, nn);
gopcode(OAND, nodconst((1<<t)-1), Z, nn);
gopcode(ONEG, nn, Z, nn);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
gopcode(OAND, nodconst((1<<t)-1), Z, nn);
patch(p1, pc);
}
break;
}
goto muldiv;
case OXOR:
#ifdef NOTYET
if(nn != Z)
if(r->op == OCONST && r->vconst == -1){
cgen(l, nn);
gopcode(OCOM, nn, Z, nn);
break;
}
#endif
case OSUB:
case OADD:
case OAND:
case OOR:
case OLSHR:
case OASHL:
case OASHR:
/*
* immediate operands
*/
if(nn != Z)
if(r->op == OCONST)
if(!typefd[n->type->etype]) {
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:
muldiv:
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, l, Z); /* note: l used for type, so shifts work! */
cgen(r, &nod1);
gopcode(o, &nod1, Z, &nod);
} else {
regalloc(&nod, l, nn); /* note: l used for type, so shifts work! */
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(r->op == OCONST)
if(!typefd[r->type->etype])
if(!typefd[n->type->etype]) {
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, l, nn); /* note: l used for type, so shifts work! */
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(&nod, n, nn);
cgen(r, &nod);
} else {
regalloc(&nod, n, nn);
cgen(r, &nod);
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
}
regalloc(&nod1, n, Z);
gopcode(OAS, &nod2, Z, &nod1);
if(nod1.type->etype != nod.type->etype){
regalloc(&nod3, &nod, Z);
gmove(&nod1, &nod3);
regfree(&nod1);
nod1 = nod3;
}
gopcode(o, &nod, &nod1, &nod);
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod, nn);
regfree(&nod);
regfree(&nod1);
if(l->addable < INDEXED)
regfree(&nod2);
break;
asbitop:
regalloc(&nod4, n, nn);
regalloc(&nod3, r, Z);
if(l->complex >= r->complex) {
bitload(l, &nod, &nod1, &nod2, &nod4);
cgen(r, &nod3);
} else {
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:
l = uncomma(l);
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;
}
if(REGARG >= 0)
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 >= 0)
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+nod.xoffset) >= -4096 && v < 4096) {
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) && nocast(n->type, nn->type)) {
/* both null, gen l->nn */
cgen(l, nn);
break;
}
if(ewidth[n->type->etype] < ewidth[l->type->etype]){
if(l->type->etype == TIND && typechlp[n->type->etype])
warn(n, "conversion of pointer to shorter integer");
}else if(0){
if(nocast(n->type, nn->type) || castup(n->type, nn->type)){
if(typefd[l->type->etype] != typefd[nn->type->etype])
regalloc(&nod, l, nn);
else
regalloc(&nod, nn, nn);
cgen(l, &nod);
gmove(&nod, nn);
regfree(&nod);
break;
}
}
regalloc(&nod, l, nn);
cgen(l, &nod);
regalloc(&nod1, n, &nod);
if(inrel)
gmover(&nod, &nod1);
else
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;
return;
}