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LibJS: Add caching of this value in ResolveThisBinding instruction

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Because "this" value cannot be changed during function execution it is
safe to compute it once and then use for future access.

This optimization makes ai-astar.js run 8% faster.
This commit is contained in:
Aliaksandr Kalenik 2023-07-28 23:59:43 +02:00 • committed by Andreas Kling
parent bbd80d2e4d
commit 2bdc69c42c
3 changed files with 12 additions and 2 deletions
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9
Userland/Libraries/LibJS/Bytecode/Op.cpp
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@ -732,8 +732,13 @@ ThrowCompletionOr<void> Jump::execute_impl(Bytecode::Interpreter& interpreter) c
ThrowCompletionOr<void> ResolveThisBinding::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
interpreter.accumulator() = TRY(vm.resolve_this_binding());
if (!interpreter.this_value().has_value()) {
// OPTIMIZATION: Because the value of 'this' cannot be reassigned during a function execution, it's
// resolved once and then saved for subsequent use.
auto& vm = interpreter.vm();
interpreter.this_value() = TRY(vm.resolve_this_binding());
}
interpreter.accumulator() = interpreter.this_value().value();
return {};
}