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Merge copy instructions if possible #969

Merged
merged 8 commits into from Apr 24, 2024
Merged

Merge copy instructions if possible #969

merged 8 commits into from Apr 24, 2024

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Robbepop
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@Robbepop Robbepop commented Mar 25, 2024

Closes #946.

This merges two copy instructions to a copy2 instruction if possible.

Locally I saw ~20% perf improvement for the fibonacci/iter benchmark test case which actually profits from this optimization since it features 2 consecutive (local.set n (local.get m)) in its .wat code:

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codecov bot commented Mar 25, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.81%. Comparing base (a3f91aa) to head (0b91bd1).

Additional details and impacted files
@@            Coverage Diff             @@
##           master     #969      +/-   ##
==========================================
+ Coverage   81.77%   81.81%   +0.03%     
==========================================
  Files         262      263       +1     
  Lines       24378    24426      +48     
==========================================
+ Hits        19936    19984      +48     
  Misses       4442     4442              

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@Robbepop
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The miri CI job fails because of this issue: rust-lang/miri#3404

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I just checked locally if ffmpeg.wasm can still be run successfully with this optimization enabled. Together with the accompanied unit tests and the entire Wasm spec testsuite passing I am confident enough in this optimization to merge it.

@Robbepop Robbepop merged commit 5d7ddfd into master Apr 24, 2024
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@Robbepop Robbepop deleted the rf-merge-copy-instrs branch April 24, 2024 17:54
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Optimization: Fuse transitive copies
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