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support 64-bit operands on 32-bit systems in compareCR

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This commit is contained in:
Joel Dice 2008-04-29 08:57:24 -06:00
parent a07a189ddb
commit 7791b1df80
1 changed files with 35 additions and 17 deletions
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52
src/x86.cpp
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@ -1563,26 +1563,44 @@ void
compareCR(Context* c, unsigned size UNUSED, Assembler::Constant* a,
Assembler::Register* b)
{
assert(c, BytesPerWord == 8 or size == 4);
int64_t v = a->value->value();
if (isInt32(v)) {
if (size == 8) rex(c);
if (isInt8(v)) {
c->code.append(0x83);
c->code.append(0xf8 | b->low);
c->code.append(v);
} else {
c->code.append(0x81);
c->code.append(0xf8 | b->low);
c->code.append4(v);
}
if (BytesPerWord == 4 and size == 8) {
ResolvedPromise low(v & 0xFFFFFFFF);
Assembler::Constant al(&low);
ResolvedPromise high((v >> 32) & 0xFFFFFFFF);
Assembler::Constant ah(&high);
Assembler::Register bh(b->high);
compareCR(c, 4, &ah, &bh);
// if the high order bits are equal, we compare the low order
// bits; otherwise, we jump past that comparison
c->code.append(0x0f);
c->code.append(0x85); // jne
c->code.append4(2);
compareCR(c, 4, &al, b);
} else {
Assembler::Register tmp(c->client->acquireTemporary());
moveCR(c, size, a, &tmp);
compareRR(c, size, &tmp, b);
c->client->releaseTemporary(tmp.low);
if (isInt32(v)) {
if (size == 8) rex(c);
if (isInt8(v)) {
c->code.append(0x83);
c->code.append(0xf8 | b->low);
c->code.append(v);
} else {
c->code.append(0x81);
c->code.append(0xf8 | b->low);
c->code.append4(v);
}
} else {
Assembler::Register tmp(c->client->acquireTemporary());
moveCR(c, size, a, &tmp);
compareRR(c, size, &tmp, b);
c->client->releaseTemporary(tmp.low);
}
}
}