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LibJS/Bytecode: Add peephole optimization pass and fuse compare+jump

This patch adds a new "Peephole" pass for performing small, local
optimizations to bytecode.

We also introduce the first such optimization, fusing a sequence of
some comparison instruction FooCompare followed by a JumpIf into a
new set of JumpFooCompare instructions.

This gives a ~50% speed-up on the following microbenchmark:

    for (let i = 0; i < 10_000_000; ++i) {
    }

But more traditional benchmarks see a pretty sizable speed-up as well,
for example 15% on Kraken/ai-astar.js and 16% on Kraken/audio-dft.js :^)
This commit is contained in:
Andreas Kling 2024-03-03 14:56:33 +01:00
parent acd29e064c
commit 4438ec481c
8 changed files with 214 additions and 24 deletions

View file

@ -82,15 +82,15 @@ public:
op->set_source_record({ start_offset, end_offset });
}
private:
explicit BasicBlock(String name);
void terminate(size_t slot_offset)
{
m_terminated = true;
m_terminator_offset = slot_offset;
}
private:
explicit BasicBlock(String name);
Vector<u8> m_buffer;
BasicBlock const* m_handler { nullptr };
BasicBlock const* m_finalizer { nullptr };