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LibJS: Add an inline JIT fast path when ToNumeric has nothing to do

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In most cases, this op will do nothing, as it is running on an the
accumulator while it already contains a number. Let's avoid doing that
native call.
This commit is contained in:
Zaggy1024 2023-10-29 07:36:39 -05:00 • committed by Andreas Kling
parent a2b0154661
commit dfaf645302
2 changed files with 21 additions and 0 deletions
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19
Userland/Libraries/LibJS/JIT/Compiler.cpp
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@ -237,6 +237,19 @@ void Compiler::compile_jump_undefined(Bytecode::Op::JumpUndefined const& op)
return BigInt::create(vm, old_value.as_bigint().big_integer().plus(Crypto::SignedBigInteger { 1 }));
}
void Compiler::jump_if_int32(Assembler::Reg reg, Assembler::Label& label)
{
// GPR0 = reg >> 48;
m_assembler.mov(Assembler::Operand::Register(GPR0), Assembler::Operand::Register(reg));
m_assembler.shift_right(Assembler::Operand::Register(GPR0), Assembler::Operand::Imm(48));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(INT32_TAG),
label);
}
template<typename Codegen>
void Compiler::branch_if_int32(Assembler::Reg reg, Codegen codegen)
{
@ -909,10 +922,16 @@ static Value cxx_to_numeric(VM& vm, Value value)
void Compiler::compile_to_numeric(Bytecode::Op::ToNumeric const&)
{
Assembler::Label fast_case {};
load_vm_register(ARG1, Bytecode::Register::accumulator());
jump_if_int32(ARG1, fast_case);
native_call((void*)cxx_to_numeric);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
fast_case.link(m_assembler);
}
static Value cxx_resolve_this_binding(VM& vm)