ref: 74d1f67b0547aa1b32648a2364f3cd6739d3e60a
dir: /sys/src/cmd/2c/cgen.c/
#include "gc.h"
void
cgen(Node *n, int result, Node *nn)
{
Node *l, *r, nod;
int lg, rg, xg, yg, g, o;
long v;
Prog *p1;
if(n == Z || n->type == T)
return;
if(typesuv[n->type->etype]) {
sugen(n, result, nn, n->type->width);
return;
}
if(debug['g']) {
if(result == D_TREE)
prtree(nn, "result");
else
print("result = %R\n", result);
prtree(n, "cgen");
}
l = n->left;
r = n->right;
o = n->op;
if(n->addable >= INDEXED) {
if(result == D_NONE) {
if(nn == Z)
switch(o) {
default:
nullwarn(Z, Z);
break;
case OINDEX:
nullwarn(l, r);
break;
}
return;
}
gmove(n->type, nn->type, D_TREE, n, result, nn);
return;
}
v = 0; /* set */
switch(o) {
default:
diag(n, "unknown op in cgen: %O", o);
break;
case OAS:
if(l->op == OBIT)
goto bitas;
/*
* recursive use of result
*/
if(result == D_NONE)
if(l->addable > INDEXED)
if(l->complex < FNX) {
cgen(r, D_TREE, l);
break;
}
/*
* function calls on both sides
*/
if(l->complex >= FNX && r->complex >= FNX) {
cgen(r, D_TOS, r);
v = argoff;
lg = regaddr(result);
lcgen(l, lg, Z);
lg |= I_INDIR;
adjsp(v - argoff);
gmove(r->type, l->type, D_TOS, r, lg, l);
if(result != D_NONE)
gmove(l->type, nn->type, lg, l, result, nn);
regfree(lg);
break;
}
rg = D_TREE;
lg = D_TREE;
if(r->complex >= l->complex) {
/*
* right side before left
*/
if(result != D_NONE) {
rg = regalloc(n->type, result);
cgen(r, rg, n);
} else
if(r->complex >= FNX || r->addable < INDEXED) {
rg = regalloc(r->type, result);
cgen(r, rg, r);
}
if(l->addable < INDEXED) {
lg = regaddr(lg);
lcgen(l, lg, Z);
lg |= I_INDIR;
}
} else {
/*
* left before right
*/
if(l->complex >= FNX || l->addable < INDEXED) {
lg = regaddr(lg);
lcgen(l, lg, Z);
lg |= I_INDIR;
}
if(result != D_NONE) {
rg = regalloc(n->type, result);
cgen(r, rg, n);
} else
if(r->addable < INDEXED) {
rg = regalloc(r->type, result);
cgen(r, rg, r);
}
}
if(result != D_NONE) {
gmove(n->type, l->type, rg, r, lg, l);
gmove(n->type, nn->type, rg, r, result, nn);
} else
gmove(r->type, l->type, rg, r, lg, l);
regfree(lg);
regfree(rg);
break;
bitas:
n = l->left;
rg = regalloc(tfield, result);
if(l->complex >= r->complex) {
lg = regaddr(D_NONE);
lcgen(n, lg, Z);
lg |= I_INDIR;
cgen(r, rg, r);
} else {
cgen(r, rg, r);
lg = regaddr(D_NONE);
lcgen(n, lg, Z);
lg |= I_INDIR;
}
g = regalloc(n->type, D_NONE);
gmove(l->type, l->type, lg, l, g, l);
bitstore(l, rg, lg, g, result, nn);
break;
case OBIT:
if(result == D_NONE) {
nullwarn(l, Z);
break;
}
g = bitload(n, D_NONE, D_NONE, result, nn);
gopcode(OAS, nn->type, g, n, result, nn);
regfree(g);
break;
case ODOT:
sugen(l, D_TREE, nodrat, l->type->width);
if(result != D_NONE) {
warn(n, "non-interruptable temporary");
nod = *nodrat;
if(!r || r->op != OCONST) {
diag(n, "DOT and no offset");
break;
}
nod.xoffset += r->vconst;
nod.type = n->type;
cgen(&nod, result, nn);
}
break;
case OASLDIV:
case OASLMOD:
case OASDIV:
case OASMOD:
if(l->op == OBIT)
goto asbitop;
if(typefd[n->type->etype])
goto asbinop;
rg = D_TREE;
if(l->complex >= FNX || r->complex >= FNX) {
rg = D_TOS;
cgen(r, rg, r);
v = argoff;
} else
if(r->addable < INDEXED) {
rg = regalloc(n->type, D_NONE);
cgen(r, rg, r);
}
lg = D_TREE;
if(!simplv(l)) {
lg = regaddr(D_NONE);
lcgen(l, lg, Z); /* destroys register optimization */
lg |= I_INDIR;
}
g = regpair(result);
gmove(l->type, n->type, lg, l, g, n);
if(rg == D_TOS)
adjsp(v - argoff);
gopcode(o, n->type, rg, r, g, n);
if(o == OASLMOD || o == OASMOD)
gmove(n->type, l->type, g+1, n, lg, l);
else
gmove(n->type, l->type, g, n, lg, l);
if(result != D_NONE)
if(o == OASLMOD || o == OASMOD)
gmove(n->type, nn->type, g+1, n, result, nn);
else
gmove(n->type, nn->type, g, n, result, nn);
regfree(g);
regfree(g+1);
regfree(lg);
regfree(rg);
break;
case OASXOR:
case OASAND:
case OASOR:
if(l->op == OBIT)
goto asbitop;
if(l->complex >= FNX ||
l->addable < INDEXED ||
result != D_NONE ||
typefd[n->type->etype])
goto asbinop;
rg = D_TREE;
if(r->op != OCONST) {
rg = regalloc(n->type, D_NONE);
cgen(r, rg, r);
}
gopcode(o, l->type, rg, r, D_TREE, l);
regfree(rg);
break;
case OASADD:
case OASSUB:
if(l->op == OBIT ||
l->complex >= FNX ||
l->addable < INDEXED ||
result != D_NONE ||
typefd[n->type->etype])
goto asbinop;
v = vconst(r);
if(v > 0 && v <= 8) {
gopcode(o, n->type, D_TREE, r, D_TREE, l);
break;
}
rg = regalloc(n->type, D_NONE);
cgen(r, rg, r);
gopcode(o, n->type, rg, r, D_TREE, l);
regfree(rg);
break;
case OASLSHR:
case OASASHR:
case OASASHL:
if(l->op == OBIT ||
l->complex >= FNX ||
l->addable < INDEXED ||
result != D_NONE ||
typefd[n->type->etype])
goto asbinop;
rg = D_TREE;
v = vconst(r);
if(v <= 0 || v > 8) {
rg = regalloc(n->type, D_NONE);
cgen(r, rg, r);
}
lg = regalloc(n->type, D_NONE);
cgen(l, lg, l);
gopcode(o, n->type, rg, r, lg, l);
gmove(n->type, n->type, lg, l, D_TREE, l);
regfree(lg);
regfree(rg);
break;
case OASLMUL:
case OASMUL:
asbinop:
if(l->op == OBIT)
goto asbitop;
rg = D_TREE;
if(l->complex >= FNX || r->complex >= FNX) {
rg = D_TOS;
cgen(r, rg, r);
v = argoff;
} else
if(r->addable < INDEXED) {
rg = regalloc(n->type, D_NONE);
cgen(r, rg, r);
} else {
if(o == OASLSHR || o == OASASHR || o == OASASHL) {
v = vconst(r);
if(v <= 0 || v > 8) {
rg = regalloc(n->type, D_NONE);
cgen(r, rg, r);
}
}
}
lg = D_TREE;
if(!simplv(l)) {
lg = regaddr(D_NONE);
lcgen(l, lg, Z); /* destroys register optimization */
lg |= I_INDIR;
}
g = regalloc(n->type, result);
gmove(l->type, n->type, lg, l, g, n);
if(rg == D_TOS)
adjsp(v - argoff);
if(o == OASXOR)
if(rg == D_TREE) {
rg = regalloc(n->type, D_NONE);
cgen(r, rg, r);
}
if(o == OASXOR || o == OASLSHR || o == OASASHR || o == OASASHL)
if(rg == D_TOS) {
rg = regalloc(n->type, D_NONE);
gmove(n->type, n->type, D_TOS, n, rg, n);
}
gopcode(o, n->type, rg, r, g, n);
gmove(n->type, l->type, g, n, lg, l);
if(result != D_NONE)
gmove(n->type, nn->type, g, n, result, nn);
regfree(g);
regfree(lg);
regfree(rg);
break;
asbitop:
rg = regaddr(D_NONE);
lg = regalloc(tfield, D_NONE);
if(l->complex >= r->complex) {
g = bitload(l, lg, rg, result, nn);
xg = regalloc(r->type, D_NONE);
cgen(r, xg, nn);
} else {
xg = regalloc(r->type, D_NONE);
cgen(r, xg, nn);
g = bitload(l, lg, rg, result, nn);
}
if(!typefd[n->type->etype]) {
if(o == OASLDIV || o == OASDIV) {
yg = regpair(result);
gmove(tfield, n->type, g, l, yg, n);
gopcode(o, n->type, xg, r, yg, n);
gmove(n->type, tfield, yg, n, g, l);
regfree(yg);
regfree(yg+1);
regfree(xg);
bitstore(l, g, rg, lg, D_NONE, nn);
break;
}
if(o == OASLMOD || o == OASMOD) {
yg = regpair(result);
gmove(tfield, n->type, g, l, yg, n);
gopcode(o, n->type, xg, r, yg, n);
gmove(n->type, tfield, yg+1, n, g, l);
regfree(yg);
regfree(yg+1);
regfree(xg);
bitstore(l, g, rg, lg, D_NONE, nn);
break;
}
}
yg = regalloc(n->type, result);
gmove(tfield, n->type, g, l, yg, n);
gopcode(o, n->type, xg, r, yg, n);
gmove(n->type, tfield, yg, n, g, l);
regfree(yg);
regfree(xg);
bitstore(l, g, rg, lg, D_NONE, nn);
break;
case OCAST:
if(result == D_NONE) {
nullwarn(l, Z);
break;
}
lg = result;
if(l->complex >= FNX)
lg = regret(l->type);
lg = eval(l, lg);
if(nocast(l->type, n->type)) {
gmove(n->type, nn->type, lg, l, result, nn);
regfree(lg);
break;
}
if(nocast(n->type, nn->type)) {
gmove(l->type, n->type, lg, l, result, nn);
regfree(lg);
break;
}
rg = regalloc(n->type, result);
gmove(l->type, n->type, lg, l, rg, n);
gmove(n->type, nn->type, rg, n, result, nn);
regfree(rg);
regfree(lg);
break;
case OCOND:
doinc(l, PRE);
boolgen(l, 1, D_NONE, Z, l);
p1 = p;
inargs++;
doinc(r->left, PRE);
cgen(r->left, result, nn);
doinc(r->left, POST);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
doinc(r->right, PRE);
cgen(r->right, result, nn);
doinc(r->right, POST);
patch(p1, pc);
inargs--;
break;
case OIND:
if(result == D_NONE) {
nullwarn(l, Z);
break;
}
lg = nodalloc(types[TIND], result, &nod);
nod.lineno = n->lineno;
if(l->op == OADD) {
if(l->left->op == OCONST) {
nod.xoffset += l->left->vconst;
l = l->right;
} else
if(l->right->op == OCONST) {
nod.xoffset += l->right->vconst;
l = l->left;
}
}
cgen(l, lg, l);
gmove(n->type, nn->type, D_TREE, &nod, result, nn);
regfree(lg);
break;
case OFUNC:
v = argoff;
inargs++;
gargs(r);
lg = D_TREE;
if(l->addable < INDEXED) {
lg = regaddr(result);
lcgen(l, lg, Z);
lg |= I_INDIR;
}
inargs--;
doinc(r, POST);
doinc(l, POST);
gopcode(OFUNC, types[TCHAR], D_NONE, Z, lg, l);
regfree(lg);
if(inargs)
adjsp(v - argoff);
if(result != D_NONE) {
lg = regret(n->type);
gmove(n->type, nn->type, lg, n, result, nn);
}
break;
case OLDIV:
case OLMOD:
case ODIV:
case OMOD:
if(result == D_NONE) {
nullwarn(l, r);
break;
}
if(typefd[n->type->etype])
goto binop;
if(r->addable >= INDEXED && r->complex < FNX) {
lg = regpair(result);
cgen(l, lg, l);
rg = D_TREE;
} else {
cgen(r, D_TOS, r);
v = argoff;
lg = regpair(result);
cgen(l, lg, l);
adjsp(v - argoff);
rg = D_TOS;
}
gopcode(o, n->type, rg, r, lg, l);
if(o == OMOD || o == OLMOD)
gmove(l->type, nn->type, lg+1, l, result, nn);
else
gmove(l->type, nn->type, lg, l, result, nn);
regfree(lg);
regfree(lg+1);
break;
case OMUL:
case OLMUL:
if(l->op == OCONST)
if(mulcon(r, l, result, nn))
break;
if(r->op == OCONST)
if(mulcon(l, r, result, nn))
break;
if(debug['M'])
print("%L multiply\n", n->lineno);
goto binop;
case OAND:
if(r->op == OCONST)
if(typeil[n->type->etype])
if(l->op == OCAST) {
if(typec[l->left->type->etype])
if(!(r->vconst & ~0xff)) {
l = l->left;
goto binop;
}
if(typeh[l->left->type->etype])
if(!(r->vconst & ~0xffff)) {
l = l->left;
goto binop;
}
}
goto binop;
case OADD:
if(result == D_TOS)
if(r->addable >= INDEXED)
if(l->op == OCONST)
if(typeil[l->type->etype]) {
v = l->vconst;
if(v > -32768 && v < 32768) {
rg = regaddr(D_NONE);
gmove(r->type, r->type, D_TREE, r, rg, r);
gopcode(OADDR, types[TSHORT], D_NONE, Z, rg, r);
p->to.offset = v;
p->to.type |= I_INDIR;
regfree(rg);
break;
}
}
case OSUB:
if(result == D_TOS)
if(l->addable >= INDEXED)
if(r->op == OCONST)
if(typeil[r->type->etype]) {
v = r->vconst;
if(v > -32768 && v < 32768) {
if(n->op == OSUB)
v = -v;
lg = regaddr(D_NONE);
gmove(l->type, l->type, D_TREE, l, lg, l);
gopcode(OADDR, types[TSHORT], D_NONE, Z, lg, l);
p->to.offset = v;
p->to.type |= I_INDIR;
regfree(lg);
break;
}
}
goto binop;
case OOR:
case OXOR:
binop:
if(result == D_NONE) {
nullwarn(l, r);
break;
}
if(l->complex >= FNX && r->complex >= FNX) {
cgen(r, D_TOS, r);
v = argoff;
lg = regalloc(l->type, result);
cgen(l, lg, l);
adjsp(v - argoff);
if(o == OXOR) {
rg = regalloc(r->type, D_NONE);
gmove(r->type, r->type, D_TOS, r, rg, r);
gopcode(o, n->type, rg, r, lg, l);
regfree(rg);
} else
gopcode(o, n->type, D_TOS, r, lg, l);
gmove(n->type, nn->type, lg, l, result, nn);
regfree(lg);
break;
}
if(l->complex >= r->complex) {
if(l->op == OADDR && (o == OADD || o == OSUB))
lg = regaddr(result);
else
lg = regalloc(l->type, result);
cgen(l, lg, l);
rg = eval(r, D_NONE);
} else {
rg = regalloc(r->type, D_NONE);
cgen(r, rg, r);
lg = regalloc(l->type, result);
cgen(l, lg, l);
}
if(o == OXOR) {
if(rg == D_TREE) {
rg = regalloc(r->type, D_NONE);
cgen(r, rg, r);
}
if(rg == D_TOS) {
rg = regalloc(r->type, D_NONE);
gmove(r->type, r->type, D_TOS, r, rg, r);
}
}
gopcode(o, n->type, rg, r, lg, l);
gmove(n->type, nn->type, lg, l, result, nn);
regfree(lg);
regfree(rg);
break;
case OASHL:
if(r->op == OCONST)
if(shlcon(l, r, result, nn))
break;
case OLSHR:
case OASHR:
if(result == D_NONE) {
nullwarn(l, r);
break;
}
if(l->complex >= FNX && r->complex >= FNX) {
cgen(r, D_TOS, r);
v = argoff;
lg = regalloc(l->type, result);
cgen(l, lg, l);
adjsp(v - argoff);
rg = regalloc(r->type, D_NONE);
gopcode(OAS, r->type, D_TOS, r, rg, r);
gopcode(n->op, n->type, rg, r, lg, l);
gmove(n->type, nn->type, lg, l, result, nn);
regfree(lg);
regfree(rg);
break;
}
if(l->complex >= r->complex) {
lg = regalloc(l->type, result);
cgen(l, lg, l);
v = vconst(r);
if(v <= 0 || v > 8) {
rg = regalloc(r->type, D_NONE);
cgen(r, rg, r);
} else
rg = eval(r, D_NONE);
} else {
rg = regalloc(r->type, D_NONE);
cgen(r, rg, r);
lg = regalloc(l->type, result);
cgen(l, lg, l);
}
gopcode(o, n->type, rg, r, lg, l);
gmove(n->type, nn->type, lg, l, result, nn);
regfree(lg);
regfree(rg);
break;
case ONEG:
case OCOM:
if(result == D_NONE) {
nullwarn(l, Z);
break;
}
lg = regalloc(l->type, result);
cgen(l, lg, l);
gopcode(o, l->type, D_NONE, Z, lg, l);
gmove(n->type, nn->type, lg, l, result, nn);
regfree(lg);
break;
case OADDR:
if(result == D_NONE) {
nullwarn(l, Z);
break;
}
if(l->op == OINDEX && l->scale == 4 && result != D_TOS) {
/* index scaled by 1, add is better */
nod = *l;
nod.op = OADD;
nod.addable = 0;
cgen(&nod, result, nn);
break;
}
lcgen(l, result, nn);
break;
case OEQ:
case ONE:
case OLE:
case OLT:
case OGE:
case OGT:
case OLO:
case OLS:
case OHI:
case OHS:
if(result == D_NONE) {
nullwarn(l, r);
break;
}
boolgen(n, 1, result, nn, Z);
break;
case OANDAND:
case OOROR:
boolgen(n, 1, result, nn, Z);
if(result == D_NONE)
patch(p, pc);
break;
case OCOMMA:
cgen(l, D_NONE, l);
doinc(l, POST);
doinc(r, PRE);
cgen(r, result, nn);
break;
case ONOT:
if(result == D_NONE) {
nullwarn(l, Z);
break;
}
boolgen(n, 1, result, nn, Z);
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;
lg = D_TREE;
if(l->addable < INDEXED) {
lg = regaddr(D_NONE);
lcgen(l, lg, Z);
lg |= I_INDIR;
}
if(result != D_NONE)
gmove(l->type, nn->type, lg, l, result, nn);
if(typefd[n->type->etype]) {
rg = regalloc(n->type, D_NONE);
gmove(l->type, l->type, lg, l, rg, l);
gopcode(o, n->type, D_CONST, nodconst(1), rg, l);
gmove(l->type, l->type, rg, l, lg, l);
regfree(rg);
} else {
if(v < 0)
gopcode(o, n->type, D_CONST, nodconst(-v), lg, l);
else
gopcode(o, n->type, D_CONST, nodconst(v), lg, l);
}
regfree(lg);
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:
lg = D_TREE;
if(l->addable < INDEXED) {
lg = regaddr(D_NONE);
lcgen(l, lg, Z);
lg |= I_INDIR;
}
if(typefd[n->type->etype]) {
rg = regalloc(n->type, D_NONE);
gmove(l->type, l->type, lg, l, rg, l);
gopcode(o, n->type, D_CONST, nodconst(1), rg, l);
gmove(l->type, l->type, rg, l, lg, l);
regfree(rg);
} else {
if(v < 0)
gopcode(o, n->type, D_CONST, nodconst(-v), lg, l);
else
gopcode(o, n->type, D_CONST, nodconst(v), lg, l);
}
if(result != D_NONE)
gmove(l->type, nn->type, lg, l, result, nn);
regfree(lg);
break;
bitinc:
rg = regaddr(D_NONE);
lg = regalloc(tfield, D_NONE);
if(result != D_NONE && (o == OPOSTINC || o == OPOSTDEC)) {
g = bitload(l, lg, rg, D_NONE, nn);
if(nn != Z)
gmove(l->type, nn->type, g, l, result, nn);
if(v < 0)
gopcode(o, n->type, D_CONST, nodconst(-v), g, n);
else
gopcode(o, n->type, D_CONST, nodconst(v), g, n);
bitstore(l, g, rg, lg, D_NONE, nn);
break;
}
g = bitload(l, lg, rg, result, nn);
if(v < 0)
gopcode(o, n->type, D_CONST, nodconst(-v), g, n);
else
gopcode(o, n->type, D_CONST, nodconst(v), g, n);
if(result != D_NONE)
gmove(l->type, nn->type, g, l, result, nn);
bitstore(l, g, rg, lg, D_NONE, nn);
break;
}
}
void
lcgen(Node *n, int result, Node *nn)
{
Node rn;
Prog *p1;
int lg;
if(n == Z || n->type == T)
return;
if(debug['g']) {
if(result == D_TREE)
prtree(nn, "result");
else
print("result = %R\n", result);
prtree(n, "lcgen");
}
if(nn == Z) {
nn = &rn;
nn->type = types[TIND];
}
switch(n->op) {
case OCOMMA:
cgen(n->left, D_NONE, n->left);
doinc(n->left, POST);
doinc(n->right, PRE);
lcgen(n->right, result, nn);
break;
case OCOND:
doinc(n->left, PRE);
boolgen(n->left, 1, D_NONE, Z, n->left);
p1 = p;
inargs++;
doinc(n->right->left, PRE);
lcgen(n->right->left, result, nn);
doinc(n->right->left, POST);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
doinc(n->right->right, PRE);
lcgen(n->right->right, result, nn);
doinc(n->right->right, POST);
patch(p1, pc);
inargs--;
break;
case OIND:
if(n->addable >= INDEXED) {
if(result >= D_A0 && result < D_A0+NREG) {
gopcode(OADDR, types[TLONG], D_TREE, n, result, nn);
break;
}
if(result == D_TOS) {
gopcode(OADDR, types[TSHORT], D_NONE, nn, D_TREE, n);
break;
}
}
cgen(n->left, result, nn);
break;
default:
if(n->addable < INDEXED) {
diag(n, "unknown op in lcgen: %O", n->op);
break;
}
if(result >= D_A0 && result < D_A0+NREG) {
gopcode(OADDR, types[TLONG], D_TREE, n, result, nn);
break;
}
if(result == D_TOS) {
gopcode(OADDR, types[TSHORT], D_NONE, nn, D_TREE, n);
break;
}
lg = regaddr(result);
gopcode(OADDR, types[TLONG], D_TREE, n, lg, nn);
gopcode(OAS, nn->type, lg, nn, result, nn);
regfree(lg);
break;
}
}
void
bcgen(Node *n, int true)
{
boolgen(n, true, D_NONE, Z, Z);
}
void
boolgen(Node *n, int true, int result, Node *nn, Node *post)
{
Prog *p1, *p2;
Node *l, *r;
int lg, rg, fp, o;
long v;
if(debug['g']) {
if(result == D_TREE)
prtree(nn, "result");
else
print("result = %R\n", result);
prtree(n, "boolgen");
}
l = n->left;
r = n->right;
switch(n->op) {
default:
lg = eval(n, result);
if(lg >= D_A0 && lg < D_A0+NREG) {
rg = regalloc(types[TLONG], D_NONE);
gopcode(OAS, types[TLONG], lg, n, rg, Z);
regfree(rg);
} else
gopcode(OTST, n->type, D_NONE, Z, lg, n);
regfree(lg);
o = ONE;
fp = typefd[n->type->etype];
goto genbool;
case OCONST:
fp = vconst(n);
if(!true)
fp = !fp;
gbranch(OGOTO);
if(fp) {
p1 = p;
gbranch(OGOTO);
patch(p1, pc);
}
goto com;
case ONOT:
boolgen(l, !true, result, nn, post);
break;
case OCOND:
doinc(l, PRE);
boolgen(l, 1, D_NONE, Z, l);
p1 = p;
inargs++;
doinc(r->left, PRE);
boolgen(r->left, true, result, nn, r->left);
if(result != D_NONE) {
doinc(r->left, POST);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
doinc(r->right, PRE);
boolgen(r->right, !true, result, nn, r->right);
doinc(r->right, POST);
patch(p1, pc);
inargs--;
break;
}
p2 = p;
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
doinc(r->right, PRE);
boolgen(r->right, !true, result, nn, r->right);
patch(p2, pc);
p2 = p;
if(doinc(post, POST|TEST)) {
lg = regalloc(types[TSHORT], D_NONE);
gopcode(OAS, types[TSHORT], D_CCR, Z, lg, Z);
doinc(post, POST);
gopcode(OAS, types[TSHORT], lg, Z, D_CCR, Z);
regfree(lg);
}
gbranch(OGOTO);
patch(p1, pc);
patch(p2, pc);
inargs--;
goto com;
case OANDAND:
if(!true)
goto caseor;
caseand:
doinc(l, PRE);
boolgen(l, true, D_NONE, Z, l);
p1 = p;
inargs++;
doinc(r, PRE);
boolgen(r, !true, D_NONE, Z, r);
p2 = p;
patch(p1, pc);
gbranch(OGOTO);
patch(p2, pc);
inargs--;
goto com;
case OOROR:
if(!true)
goto caseand;
caseor:
doinc(l, PRE);
boolgen(l, !true, D_NONE, Z, l);
p1 = p;
inargs++;
doinc(r, PRE);
boolgen(r, !true, D_NONE, Z, r);
p2 = p;
gbranch(OGOTO);
patch(p1, pc);
patch(p2, pc);
inargs--;
goto com;
case OEQ:
case ONE:
if(vconst(l) == 0) {
if(n->op == ONE) {
boolgen(r, true, result, nn, post);
break;
}
boolgen(r, !true, result, nn, post);
break;
}
case OLE:
case OLT:
case OGE:
case OGT:
case OHI:
case OHS:
case OLO:
case OLS:
fp = typefd[r->type->etype];
if(l->op == OCONST) {
v = vconst(l);
if(v == 0) { /* tst instruction */
o = invrel[relindex(n->op)];
rg = eval(r, result);
gopcode(OTST, r->type, D_NONE, Z, rg, r);
regfree(rg);
goto genbool;
}
if(!fp) { /* cmpi and movq, saves about .5% both time and space */
if(v < 128 && v >= -128 &&
ewidth[r->type->etype] == SZ_LONG) {
rg = eval(r, result);
lg = regalloc(l->type, D_NONE);
cgen(l, lg, l);
o = n->op;
gopcode(o, l->type, lg, l, rg, r);
regfree(lg);
regfree(rg);
goto genbool;
}
o = invrel[relindex(n->op)];
rg = eval(r, result);
gopcode(o, r->type, rg, r, D_TREE, l);
regfree(rg);
goto genbool;
}
}
lg = D_TOS;
if(r->complex < FNX)
lg = regalloc(l->type, lg);
cgen(l, lg, l);
v = argoff;
rg = eval(r, result);
if(lg == D_TOS) {
adjsp(v - argoff);
lg = regalloc(l->type, lg);
gopcode(OAS, l->type, D_TOS, l, lg, l);
}
o = n->op;
gopcode(o, l->type, lg, l, rg, r);
regfree(lg);
regfree(rg);
genbool:
if(true)
o = comrel[relindex(o)];
if(doinc(post, POST|TEST)) {
lg = regalloc(types[TSHORT], D_NONE);
gopcode(OAS, types[TSHORT], D_CCR, Z, lg, Z);
doinc(post, POST);
gopcode(OAS, types[TSHORT], lg, Z, D_CCR, Z);
regfree(lg);
}
gbranch(o);
if(fp)
fpbranch();
com:
if(result == D_NONE)
break;
p1 = p;
gopcode(OAS, nn->type, D_CONST, nodconst(1), result, nn);
gbranch(OGOTO);
p2 = p;
patch(p1, pc);
gopcode(OAS, nn->type, D_CONST, nodconst(0), result, nn);
patch(p2, pc);
break;
}
}
void
sugen(Node *n, int result, Node *nn, long w)
{
long s, v, o;
int lg, rg, ng;
Prog *p1;
Node *l, *r, nod;
Type *t;
if(n == Z || n->type == T)
return;
if(debug['g']) {
if(result == D_TREE)
prtree(nn, "result");
else
print("result = %R width = %ld\n", result, w);
prtree(n, "sugen");
}
s = argoff;
if(result == D_TREE) {
if(nn == nodrat)
if(w > nrathole)
nrathole = w;
}
if(n->addable >= INDEXED && n->op != OCONST)
goto copy;
switch(n->op) {
default:
diag(n, "unknown op in sugen: %O", n->op);
break;
case OCONST:
if(n->type && typev[n->type->etype]) {
if(result == D_NONE) {
nullwarn(n->left, Z);
break;
}
lg = regaddr(D_NONE);
if(result == D_TOS) {
adjsp(s - argoff + w);
gopcode(OADDR, types[TIND], result, nn, lg, n);
} else
if(result == D_TREE) {
lcgen(nn, lg, Z);
} else
diag(n, "unknown su result: %R", result);
gopcode(OAS, types[TLONG], D_CONST, nodconst((long)(n->vconst>>32)),
lg|I_INDINC, n);
gopcode(OAS, types[TLONG], D_CONST, nodconst((long)(n->vconst)),
lg|I_INDINC, n);
regfree(lg);
break;
}
goto copy;
case ODOT:
l = n->left;
sugen(l, D_TREE, nodrat, l->type->width);
if(result != D_NONE) {
warn(n, "non-interruptable temporary");
nod = *nodrat;
r = n->right;
if(!r || r->op != OCONST) {
diag(n, "DOT and no offset");
break;
}
nod.xoffset += r->vconst;
nod.type = n->type;
sugen(&nod, result, nn, w);
}
break;
case OIND:
if(result == D_NONE) {
nullwarn(n->left, Z);
break;
}
goto copy;
case OSTRUCT:
lg = nodalloc(types[TIND], result, &nod);
nod.lineno = n->lineno;
if(result == D_TREE)
lcgen(nn, lg, Z);
else
if(result == D_TOS) {
adjsp(s - argoff + w);
gopcode(OADDR, types[TIND], result, nn, lg, n);
} else
diag(n, "unknown su result: %R", result);
o = 0;
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;
}
nod.type = t;
if(l->complex < FNX) {
nod.xoffset = 0;
if(o != t->offset) {
gopcode(OADD, types[TIND], D_CONST,
nodconst(t->offset-o), lg, Z);
o = t->offset;
}
cgen(l, D_TREE, &nod);
continue;
}
nod.xoffset = t->offset - o;
gopcode(OAS, types[TIND], lg, Z, D_TOS, Z);
s = argoff;
if(typesuv[t->etype]) {
sugen(l, D_TREE, nodrat, t->width);
adjsp(s - argoff);
gopcode(OAS, types[TIND], D_TOS, Z, lg, Z);
warn(n, "non-interruptable temporary");
sugen(nodrat, D_TREE, &nod, t->width);
continue;
}
rg = regalloc(t, D_NONE);
cgen(l, rg, l);
adjsp(s - argoff);
gopcode(OAS, types[TIND], D_TOS, Z, lg, Z);
gopcode(OAS, t, rg, Z, D_TREE, &nod);
regfree(rg);
}
regfree(lg);
break;
case OAS:
if(result == D_NONE) {
sugen(n->right, D_TREE, n->left, w);
break;
}
sugen(n->right, D_TREE, nodrat, w); /* could do better */
warn(n, "non-interruptable temporary");
sugen(nodrat, D_TREE, n->left, w);
sugen(nodrat, result, nn, w);
break;
case OFUNC:
if(result == D_NONE) {
sugen(n, D_TREE, nodrat, w);
break;
}
inargs++;
/* prepare zero-th arg: address of result */
if(result == D_TOS) {
adjsp(s - argoff + w);
v = argoff;
gargs(n->right);
gopcode(OADDR, types[TSHORT], D_NONE, nn, result, nn);
p->to.type = D_STACK;
p->to.offset = argoff - v;
} else
if(result == D_TREE) {
v = argoff;
gargs(n->right);
if(nn->complex >= FNX) {
rg = regalloc(types[TIND], regret(types[TIND]));
lcgen(nn, rg, Z);
gopcode(OAS, types[TIND], rg, Z, D_TOS, Z);
regfree(rg);
} else
lcgen(nn, D_TOS, Z);
} else {
diag(n, "unknown result in FUNC sugen");
break;
}
argoff += types[TIND]->width;
l = n->left;
lg = D_TREE;
if(l->addable < INDEXED) {
lg = regaddr(result);
lcgen(l, lg, Z);
lg |= I_INDIR;
}
inargs--;
doinc(n->right, POST);
doinc(n->left, POST);
gopcode(OFUNC, types[TCHAR], D_NONE, Z, lg, l);
regfree(lg);
if(inargs)
adjsp(v - argoff);
break;
case OCOND:
doinc(n->left, PRE);
boolgen(n->left, 1, D_NONE, Z, n->left);
p1 = p;
inargs++;
doinc(n->right->left, PRE);
sugen(n->right->left, result, nn, w);
doinc(n->right->left, POST);
gbranch(OGOTO);
patch(p1, pc);
p1 = p;
doinc(n->right->right, PRE);
sugen(n->right->right, result, nn, w);
doinc(n->right->right, POST);
patch(p1, pc);
inargs--;
break;
case OCOMMA:
cgen(n->left, D_NONE, n->left);
doinc(n->left, POST);
doinc(n->right, PRE);
sugen(n->right, result, nn, w);
break;
}
return;
copy:
if(result == D_NONE)
return;
rg = regaddr(D_NONE);
lcgen(n, rg, Z);
lg = regaddr(D_NONE);
if(result == D_TOS) {
adjsp(s - argoff + w);
gopcode(OADDR, types[TIND], result, nn, lg, n);
} else
if(result == D_TREE) {
if(nn->complex >= FNX) {
gopcode(OAS, types[TIND], rg, n, D_TOS, n);
s = argoff;
lcgen(nn, lg, Z);
adjsp(s - argoff);
gopcode(OAS, types[TIND], D_TOS, n, rg, n);
} else
lcgen(nn, lg, Z);
} else
diag(n, "unknown su result: %R", result);
if(w % SZ_LONG)
diag(Z, "sucopy width not 0%%%d", SZ_LONG);
v = w / SZ_LONG;
if(v & 1) {
gopcode(OAS, types[TLONG], rg|I_INDINC, n, lg|I_INDINC, n);
v--;
}
if(v > 6) {
ng = regalloc(types[TLONG], D_NONE);
gopcode(OAS, types[TLONG], D_CONST, nodconst(v/2-1), ng, n);
v = pc;
gopcode(OAS, types[TLONG], rg|I_INDINC, n, lg|I_INDINC, n);
gopcode(OAS, types[TLONG], rg|I_INDINC, n, lg|I_INDINC, n);
gbranch(OGT);
patch(p, v);
p->from.type = ng;
p->as = ADBF;
regfree(ng);
} else
while(v > 0) {
gopcode(OAS, types[TLONG], rg|I_INDINC, n, lg|I_INDINC, n);
v--;
}
regfree(lg);
regfree(rg);
}