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LibJS/JIT: Use the x86_64 setcc instruction to remove a branch

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Bastiaan van der Plaat 2023-11-13 17:41:05 +01:00 • committed by Andreas Kling
parent 1d76738dde
commit d3b3e49e19
3 changed files with 17 additions and 16 deletions
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8
Userland/Libraries/LibJIT/X86_64/Assembler.h
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@ -569,6 +569,14 @@ struct X86_64Assembler {
jump_if(condition, label);
}
void set_if(Condition condition, Operand dst)
{
emit_rex_for_slash(dst, REX_W::No);
emit8(0x0f);
emit8(0x90 | to_underlying(condition));
emit_modrm_slash(0, dst);
}
void sign_extend_32_to_64_bits(Reg reg)
{
mov32(Operand::Register(reg), Operand::Register(reg), Extension::SignExtend);