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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 :^)
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8 changed files with 214 additions and 24 deletions
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@ -69,6 +69,14 @@
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O(IteratorToArray) \
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O(Jump) \
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O(JumpIf) \
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O(JumpGreaterThan) \
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O(JumpGreaterThanEquals) \
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O(JumpLessThan) \
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O(JumpLessThanEquals) \
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O(JumpLooselyEquals) \
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O(JumpLooselyInequals) \
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O(JumpStrictlyEquals) \
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O(JumpStrictlyInequals) \
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O(JumpNullish) \
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O(JumpUndefined) \
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O(LeaveLexicalEnvironment) \
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