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LibJS+LibJIT: Add fast path for Int32 - Int32

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This commit is contained in:
Andreas Kling 2023-11-03 08:35:07 +01:00
parent 56b4586d65
commit 17ae6edd8e
3 changed files with 67 additions and 1 deletions
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25
Userland/Libraries/LibJIT/Assembler.h
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@ -664,6 +664,31 @@ struct Assembler {
}
}
void sub32(Operand dst, Operand src, Optional<Label&> overflow_label)
{
if (dst.is_register_or_memory() && src.type == Operand::Type::Reg) {
emit_rex_for_mr(dst, src, REX_W::No);
emit8(0x29);
emit_modrm_mr(dst, src);
} else if (dst.is_register_or_memory() && src.type == Operand::Type::Imm && src.fits_in_i8()) {
emit_rex_for_slash(dst, REX_W::No);
emit8(0x83);
emit_modrm_slash(5, dst);
emit8(src.offset_or_immediate);
} else if (dst.is_register_or_memory() && src.type == Operand::Type::Imm && src.fits_in_i32()) {
emit_rex_for_slash(dst, REX_W::No);
emit8(0x81);
emit_modrm_slash(5, dst);
emit32(src.offset_or_immediate);
} else {
VERIFY_NOT_REACHED();
}
if (overflow_label.has_value()) {
jump_if(Condition::Overflow, *overflow_label);
}
}
// NOTE: It's up to the caller of this function to preserve registers as needed.
void native_call(void* callee, Vector<Operand> const& stack_arguments = {})
{