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LibJIT: Use test x, x instead of cmp x, 0 in all cases

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The `test` instruction will have the same result as `cmp` when
comparing to zero, so let's always emit that code. This has no effect
until the following commit.
This commit is contained in:
Zaggy1024 2023-10-29 04:51:25 -05:00 • committed by Andreas Kling
commit e717961000
Notes: sideshowbarker 2024-07-17 04:09:56 +09:00
1 changed files with 3 additions and 1 deletions
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4
Userland/Libraries/LibJIT/Assembler.h
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@ -293,7 +293,9 @@ struct Assembler {
void cmp(Operand lhs, Operand rhs)
{
if (lhs.type == Operand::Type::Reg && rhs.type == Operand::Type::Reg) {
if (rhs.type == Operand::Type::Imm && rhs.offset_or_immediate == 0) {
test(lhs, lhs);
} else if (lhs.type == Operand::Type::Reg && rhs.type == Operand::Type::Reg) {
emit8(0x48
| ((to_underlying(rhs.reg) >= 8) ? 1 << 2 : 0)
| ((to_underlying(lhs.reg) >= 8) ? 1 << 0 : 0));