[all-commits] [llvm/llvm-project] ae1bc9: [InstCombine] avoid infinite loop from vector sele...

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  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ae1bc9ebf3a07d2b8c93624518f649805deccc3e
      https://github.com/llvm/llvm-project/commit/ae1bc9ebf3a07d2b8c93624518f649805deccc3e
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2021-05-25 (Tue, 25 May 2021)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
    M llvm/test/Transforms/InstCombine/select.ll

  Log Message:
  -----------
  [InstCombine] avoid infinite loop from vector select transforms

The 2nd test is based on the fuzzer example in post-commit
comments of D101191 -
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34661

The 1st test shows that we don't deal with this symmetrically.
We should be able to reduce both examples (possibly in
instsimplify instead of instcombine).