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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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@ -12,6 +12,7 @@ set(SOURCES
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Bytecode/Pass/DumpCFG.cpp
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Bytecode/Pass/GenerateCFG.cpp
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Bytecode/Pass/MergeBlocks.cpp
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Bytecode/Pass/Peephole.cpp
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Bytecode/Pass/PlaceBlocks.cpp
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Bytecode/Pass/UnifySameBlocks.cpp
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Bytecode/RegexTable.cpp
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