RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-20 14:25:08 +00:00
Code Issues Activity Actions

LibJS: Avoid IdentifierTable lookup in cached GetGlobal op

Browse source 
When we hit the cache in GetGlobal, we don't need the identifier string
at all, so let's defer fetching it until after the cache miss.

7% speed-up on Kraken/imaging-gaussian-blur.js :^)
This commit is contained in:
Andreas Kling 2023-10-08 11:18:33 +02:00
parent 4cc2fc4afa
commit 6a3f27509f
1 changed files with 1 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

3
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
View file

@ -880,8 +880,6 @@ ThrowCompletionOr<void> GetGlobal::execute_impl(Bytecode::Interpreter& interpret
auto& vm = interpreter.vm();
auto& realm = *vm.current_realm();
auto const& name = interpreter.current_executable().get_identifier(m_identifier);
auto& cache = interpreter.current_executable().global_variable_caches[m_cache_index];
auto& binding_object = realm.global_environment().object_record().binding_object();
auto& declarative_record = realm.global_environment().declarative_record();
@ -898,6 +896,7 @@ ThrowCompletionOr<void> GetGlobal::execute_impl(Bytecode::Interpreter& interpret
cache.environment_serial_number = declarative_record.environment_serial_number();
auto const& name = interpreter.current_executable().get_identifier(m_identifier);
if (vm.running_execution_context().script_or_module.has<NonnullGCPtr<Module>>()) {
// NOTE: GetGlobal is used to access variables stored in the module environment and global environment.
// The module environment is checked first since it precedes the global environment in the environment chain.