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LibJS/JIT: Consolidate exits from the jitted code

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Instead of emitting the "restore callee-saved registers and return"
sequence again and again, just emit it once at the end of the generated
code, and have everyone jump to it.

This is a code size optimization that saves 207KiB on Kraken/ai-astar.js
This commit is contained in:
Andreas Kling 2023-10-28 13:57:50 +02:00
parent 0768bf2623
commit 9afd12a8ba
2 changed files with 15 additions and 4 deletions
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3
Userland/Libraries/LibJS/JIT/Compiler.h
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@ -127,6 +127,8 @@ private:
void push_unwind_context(bool valid, Optional<Bytecode::Label> const& handler, Optional<Bytecode::Label> const& finalizer);
void pop_unwind_context();
void jump_to_exit();
template<typename Codegen>
void branch_if_int32(Assembler::Reg, Codegen);
@ -160,6 +162,7 @@ private:
Vector<u8> m_output;
Assembler m_assembler { m_output };
Assembler::Label m_exit_label;
Bytecode::Executable& m_bytecode_executable;
};