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This has potential to cause perf regressions: https://reviews.llvm.org/rG7bd361200a7b
...but hopefully that makes the transform sound for all existing regression tests.
We discussed follow-ups to improve the transform in the review.
Extended Description
// llvm/test/Transforms/InstCombine/fabs.ll
After the transformation, nnan flag should be dropped because %x can be NaN.
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