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do constant-to-memory movq in one instruction on amd64 when possible

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This commit is contained in:
Joel Dice 2008-11-25 19:22:21 -07:00
parent 61ecb56e21
commit f9145528c8
1 changed files with 13 additions and 5 deletions
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18
src/x86.cpp
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@ -958,13 +958,21 @@ moveCM(Context* c, unsigned aSize UNUSED, Assembler::Constant* a,
break; break;
case 8: { case 8: {
Assembler::Constant ah(shiftMaskPromise(c, a->value, 32, 0xFFFFFFFF)); if (BytesPerWord == 8
Assembler::Constant al(shiftMaskPromise(c, a->value, 0, 0xFFFFFFFF)); and a->value->resolved()
and isInt32(a->value->value()))
{
encode(c, 0xc7, 0, b, true);
c->code.append4(a->value->value());
} else {
Assembler::Constant ah(shiftMaskPromise(c, a->value, 32, 0xFFFFFFFF));
Assembler::Constant al(shiftMaskPromise(c, a->value, 0, 0xFFFFFFFF));
Assembler::Memory bh(b->base, b->offset + 4, b->index, b->scale); Assembler::Memory bh(b->base, b->offset + 4, b->index, b->scale);
moveCM(c, 4, &al, 4, b); moveCM(c, 4, &al, 4, b);
moveCM(c, 4, &ah, 4, &bh); moveCM(c, 4, &ah, 4, &bh);
}
} break; } break;
default: abort(c); default: abort(c);