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LibJS/JIT: Add fast path for cached GetVariable accesses

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We can now stay in machine code for environment variable read accesses
as long as they are cached and initialized.

20% speed-up on Octane/zlib.js :^)
This commit is contained in:
Andreas Kling 2023-11-06 15:23:49 +01:00
parent 7826c006c1
commit 1d8ec677a3
6 changed files with 147 additions and 3 deletions
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2
Userland/Libraries/LibJS/Runtime/ExecutionContext.h
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@ -30,6 +30,8 @@ struct ExecutionContext {
void visit_edges(Cell::Visitor&);
static FlatPtr lexical_environment_offset() { return OFFSET_OF(ExecutionContext, lexical_environment); }
private:
explicit ExecutionContext(MarkedVector<Value> existing_arguments, MarkedVector<Value> existing_local_variables);