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5 commits

Author SHA1 Message Date
Andreas Kling
c4a0afbe28 Revert "LibJS/Bytecode: Fuse [Not, JumpIf] instructions into JumpIfNot" 
This reverts commit 795149e585.
 2024-03-06 08:39:29 +01:00
Andreas Kling
ea0b7192fa Revert "LibJS/Bytecode: Don't fuse unrelated compare and jump in peephole pass" 
This reverts commit c1dbde72e9.
 2024-03-06 08:39:29 +01:00
Andreas Kling
c1dbde72e9 LibJS/Bytecode: Don't fuse unrelated compare and jump in peephole pass 
Fixes an issue where https://x.com/awesomekling crashed on load. :^)
 2024-03-05 13:39:25 +01:00
Andreas Kling
795149e585 LibJS/Bytecode: Fuse [Not, JumpIf] instructions into JumpIfNot 2024-03-04 20:54:51 +01:00
Andreas Kling
4438ec481c 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 :^)
 2024-03-04 20:54:51 +01:00