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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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42
Userland/Libraries/LibJS/JIT/Compiler.cpp
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@ -536,6 +536,48 @@ void Compiler::compile_add(Bytecode::Op::Add const& op)
end.link(m_assembler);
}
static Value cxx_sub(VM& vm, Value lhs, Value rhs)
{
return TRY_OR_SET_EXCEPTION(sub(vm, lhs, rhs));
}
void Compiler::compile_sub(Bytecode::Op::Sub const& op)
{
load_vm_register(ARG1, op.lhs());
load_accumulator(ARG2);
Assembler::Label end {};
Assembler::Label slow_case {};
branch_if_both_int32(ARG1, ARG2, [&] {
// GPR0 = ARG1 + ARG2 (32-bit)
// if (overflow) goto slow_case;
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(ARG1));
m_assembler.sub32(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(ARG2),
slow_case);
// accumulator = GPR0 | SHIFTED_INT32_TAG;
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Imm(SHIFTED_INT32_TAG));
m_assembler.bitwise_or(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(GPR1));
store_accumulator(GPR0);
m_assembler.jump(end);
});
slow_case.link(m_assembler);
native_call((void*)cxx_sub);
store_accumulator(RET);
check_exception();
end.link(m_assembler);
}
static Value cxx_less_than(VM& vm, Value lhs, Value rhs)
{
return TRY_OR_SET_EXCEPTION(less_than(vm, lhs, rhs));