[all-commits] [llvm/llvm-project] 3cde55: [InstCombine] add tests for signbit splat mask; NFC

[Sanjay Patel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3cde55d8071d03a2de26fe2c962a92a7b256db8c
      https://github.com/llvm/llvm-project/commit/3cde55d8071d03a2de26fe2c962a92a7b256db8c
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2022-08-27 (Sat, 27 Aug 2022)

  Changed paths:
    M llvm/test/Transforms/InstCombine/and.ll

  Log Message:
  -----------
  [InstCombine] add tests for signbit splat mask; NFC

issue #57381


  Commit: 7abf233f44b959520ed09e56638e89898810f25e
      https://github.com/llvm/llvm-project/commit/7abf233f44b959520ed09e56638e89898810f25e
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2022-08-27 (Sat, 27 Aug 2022)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
    M llvm/test/Transforms/InstCombine/sub-ashr-and-to-icmp-select.ll

  Log Message:
  -----------
  [InstCombine] allow poison (undef) element in vector signbit transforms

If the shift constant has undefined lanes, we can assume those
are the same as the defined lanes in these transforms:
https://alive2.llvm.org/ce/z/t6TTJ2

Replace undef with poison in the test while here to support
the transition away from undef.


Compare: https://github.com/llvm/llvm-project/compare/b9c2b6069ea7...7abf233f44b9