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Unverified Commit 2bfa7d0e authored by Yingwei Zheng's avatar Yingwei Zheng Committed by GitHub
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[InstCombine] Fold `fmul X, -0.0` into `copysign(0.0, -X)` (#85772) 

`fneg + copysign` is better than fmul for analysis/codegen.
godbolt: https://godbolt.org/z/eEs6dGd1G
Alive2: https://alive2.llvm.org/ce/z/K3M5BA
parent 686f4599
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