Enabling globalMerge on external causes regression
Open
llvm:codegen
- Dominant language
- LLVM
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Description
We are able to see regression around 7% with the `MultiSource/Benchmarks/VersaBench/8b10b/8b10b.test` in llvm-test-suite post merging #158592
[Here](https://godbolt.org/z/xKbh69je5) is the short reproducer of the same.
@davemgreen just fyi. I havent analysed this in detail.
Contributor guide
Research direction
Start by reproducing the regression with MultiSource/Benchmarks/VersaBench/8b10b/8b10b.test from llvm-test-suite and compare results around the merge of #158592. Use the linked Godbolt reproducer to narrow the behavior, then confirm that the reported performance loss is resolved without introducing a new regression.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers, performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100