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LibJS: Avoid unnecessary MarkedVector in Bytecode::Op::Call::execute()

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perform_call() wants a ReadonlySpan<Value>, so just grab a slice of the
current register window instead of making a MarkedVector.

10% speed-up on this function call microbenchmark:

    function callee(a, b, c) { }

    function caller(callee) {
        for (let i = 0; i < 10_000_000; ++i)
            callee(1, 2, 3)
    }

    caller(callee)
This commit is contained in:
Andreas Kling 2024-01-22 21:51:12 +01:00
parent 791b0eb709
commit 8d0344a636
1 changed files with 1 additions and 7 deletions
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8
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@ -1000,7 +1000,6 @@ static ThrowCompletionOr<Value> dispatch_builtin_call(Bytecode::Interpreter& int
ThrowCompletionOr<void> Call::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
auto callee = interpreter.reg(m_callee);
TRY(throw_if_needed_for_call(interpreter, callee, call_type(), expression_string()));
@ -1010,12 +1009,7 @@ ThrowCompletionOr<void> Call::execute_impl(Bytecode::Interpreter& interpreter) c
return {};
}
MarkedVector<Value> argument_values(vm.heap());
argument_values.ensure_capacity(m_argument_count);
for (u32 i = 0; i < m_argument_count; ++i) {
argument_values.unchecked_append(interpreter.reg(Register { m_first_argument.index() + i }));
}
interpreter.accumulator() = TRY(perform_call(interpreter, interpreter.reg(m_this_value), call_type(), callee, move(argument_values)));
interpreter.accumulator() = TRY(perform_call(interpreter, interpreter.reg(m_this_value), call_type(), callee, interpreter.registers().slice(m_first_argument.index(), m_argument_count)));
return {};
}