[all-commits] [llvm/llvm-project] 536cb1: [InstCombine] Fix for folding select-like `shuffle...

[Michele Scandale via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 536cb1fad3ea3edaba8264992c8de2f4b07abc84
      https://github.com/llvm/llvm-project/commit/536cb1fad3ea3edaba8264992c8de2f4b07abc84
  Author: Michele Scandale <michele.scandale at gmail.com>
  Date:   2024-03-21 (Thu, 21 Mar 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
    M llvm/test/Transforms/InstCombine/shuffle_select-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/shuffle_select.ll

  Log Message:
  -----------
  [InstCombine] Fix for folding select-like `shufflevector` into floating point binary operators. (#85452)

Folding a select-like `shufflevector` into a floating point binary
operators can only be done if the result is preserved for both case. In
particular, if the common operand of the `shufflevector` and the
floating point binary operator can be a NaN, then the transformation
won't preserve the result value.



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