[all-commits] [llvm/llvm-project] 7dc550: [LLVM][CodeGen][AArch64] Improve PTEST removal by ...

[Paul Walker via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7dc550473c5239399707804c9466519d165aa7fd
      https://github.com/llvm/llvm-project/commit/7dc550473c5239399707804c9466519d165aa7fd
  Author: Paul Walker <paul.walker at arm.com>
  Date:   2025-03-20 (Thu, 20 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
    M llvm/test/CodeGen/AArch64/sve-ptest-removal-cmpeq.mir

  Log Message:
  -----------
  [LLVM][CodeGen][AArch64] Improve PTEST removal by looking through copies. (#132041)

The general predicates of the PTEST and PTEST_like instructions may
belong to different register classes. This can lead to the insertion of
a COPY instruction, making them appear different. However, for the
purpose of PTEST removal, such copies are irrelevant, and we can look
through them to improve the likelihood of finding a match.



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