[all-commits] [llvm/llvm-project] fc520f: [InstCombine] Precommit tests for PR75745 (NFC)

[Antonio Frighetto via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fc520f8b29416a3b0738e6c8c3a6d4eee67e42a6
      https://github.com/llvm/llvm-project/commit/fc520f8b29416a3b0738e6c8c3a6d4eee67e42a6
  Author: Antonio Frighetto <me at antoniofrighetto.com>
  Date:   2023-12-17 (Sun, 17 Dec 2023)

  Changed paths:
    M llvm/test/Transforms/InstCombine/insert-const-shuf.ll
    M llvm/test/Transforms/InstCombine/vec_shuffle.ll

  Log Message:
  -----------
  [InstCombine] Precommit tests for PR75745 (NFC)


  Commit: 151ddf07a6f7a6c1440c587f2df52b127f29f99c
      https://github.com/llvm/llvm-project/commit/151ddf07a6f7a6c1440c587f2df52b127f29f99c
  Author: Antonio Frighetto <me at antoniofrighetto.com>
  Date:   2023-12-17 (Sun, 17 Dec 2023)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/test/Transforms/InstCombine/insert-const-shuf.ll
    M llvm/test/Transforms/InstCombine/vec_shuffle.ll

  Log Message:
  -----------
  [InstCombine] Stop propagating `undef` when element is demanded

Do not poison `undef` demanded elements in `SimplifyDemandedVectorElts`.
A miscompilation issue has been addressed with refined checking.

Proofs: https://alive2.llvm.org/ce/z/WA5oD5.


Compare: https://github.com/llvm/llvm-project/compare/d14ee76181fb...151ddf07a6f7