[all-commits] [llvm/llvm-project] 469da6: [InstSimplify] Re-enable select ?, undef, X -> X t...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 469da663f2df150629786df3f82c217062924f5e
      https://github.com/llvm/llvm-project/commit/469da663f2df150629786df3f82c217062924f5e
  Author: Craig Topper <craig.topper at intel.com>
  Date:   2020-07-09 (Thu, 09 Jul 2020)

  Changed paths:
    M llvm/lib/Analysis/InstructionSimplify.cpp
    M llvm/test/Transforms/InstSimplify/select.ll

  Log Message:
  -----------
  [InstSimplify] Re-enable select ?, undef, X -> X transform when X is provably not poison

Follow up from the transform being removed in D83360. If X is probably not poison, then the transform is safe.

Still plan to remove or adjust the code from ConstantFolding after this.

Differential Revision: https://reviews.llvm.org/D83440