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LibJS+LibJIT: Add fast path for Int32 - Int32
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parent
56b4586d65
commit
17ae6edd8e
3 changed files with 67 additions and 1 deletions
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@ -664,6 +664,31 @@ struct Assembler {
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}
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}
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void sub32(Operand dst, Operand src, Optional<Label&> overflow_label)
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{
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if (dst.is_register_or_memory() && src.type == Operand::Type::Reg) {
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emit_rex_for_mr(dst, src, REX_W::No);
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emit8(0x29);
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emit_modrm_mr(dst, src);
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} else if (dst.is_register_or_memory() && src.type == Operand::Type::Imm && src.fits_in_i8()) {
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emit_rex_for_slash(dst, REX_W::No);
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emit8(0x83);
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emit_modrm_slash(5, dst);
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emit8(src.offset_or_immediate);
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} else if (dst.is_register_or_memory() && src.type == Operand::Type::Imm && src.fits_in_i32()) {
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emit_rex_for_slash(dst, REX_W::No);
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emit8(0x81);
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emit_modrm_slash(5, dst);
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emit32(src.offset_or_immediate);
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} else {
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VERIFY_NOT_REACHED();
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}
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if (overflow_label.has_value()) {
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jump_if(Condition::Overflow, *overflow_label);
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}
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}
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// NOTE: It's up to the caller of this function to preserve registers as needed.
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void native_call(void* callee, Vector<Operand> const& stack_arguments = {})
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{
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