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LibJS/JIT: Add fast path for RightShift

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This commit is contained in:
iliadsh 2023-11-07 04:26:49 +00:00 • committed by Andreas Kling
parent 1244e91481
commit c956316c98
3 changed files with 55 additions and 1 deletions
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38
Userland/Libraries/LibJS/JIT/Compiler.cpp
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@ -800,6 +800,44 @@ void Compiler::compile_left_shift(Bytecode::Op::LeftShift const& op)
end.link(m_assembler);
}
static Value cxx_right_shift(VM& vm, Value lhs, Value rhs)
{
return TRY_OR_SET_EXCEPTION(right_shift(vm, lhs, rhs));
}
void Compiler::compile_right_shift(Bytecode::Op::RightShift const& op)
{
load_vm_register(ARG1, op.lhs());
load_accumulator(ARG2);
Assembler::Label end {};
branch_if_both_int32(ARG1, ARG2, [&] {
// RCX = ARG2
m_assembler.mov(
Assembler::Operand::Register(Assembler::Reg::RCX),
Assembler::Operand::Register(ARG2));
// ARG1 >>= CL (32-bit)
m_assembler.arithmetic_right_shift32(Assembler::Operand::Register(ARG1), {});
// accumulator = ARG1 | SHIFTED_INT32_TAG;
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(SHIFTED_INT32_TAG));
m_assembler.bitwise_or(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Register(GPR0));
store_accumulator(ARG1);
m_assembler.jump(end);
});
native_call((void*)cxx_right_shift);
store_accumulator(RET);
check_exception();
end.link(m_assembler);
}
static ThrowCompletionOr<Value> not_(VM&, Value value)
{
return Value(!value.to_boolean());