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[InstCombine] Add an additional nnan constraint for xfrm fcmp + sel => fmax/fmin #117977

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[InstCombine] Add an additional nnan constraint for xfrm fcmp + sel => fmax/fmin #117977

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Commits on Nov 28, 2024

  1. [InstCombine][FP] Fix nnan preserve for xfrm fcmp + sel => fmax/fmin 

    Preserve `nnan` constraint only if present on both the instructions:
`fcmp` and `select`.

Alive2: https://alive2.llvm.org/ce/z/ZNDjzt
    @rajatbajpai
    rajatbajpai committed Nov 28, 2024
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