[all-commits] [llvm/llvm-project] fe7fc5: [AArch64] Use mov as opposed to And 0xffffffff (#9...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fe7fc54403e17b17e366adaab75256b2269fc204
      https://github.com/llvm/llvm-project/commit/fe7fc54403e17b17e366adaab75256b2269fc204
  Author: David Green <david.green at arm.com>
  Date:   2024-07-14 (Sun, 14 Jul 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/test/CodeGen/AArch64/aarch64-mull-masks.ll
    M llvm/test/CodeGen/AArch64/and-mask-removal.ll
    M llvm/test/CodeGen/AArch64/arm64-2012-05-09-LOADgot-bug.ll
    M llvm/test/CodeGen/AArch64/arm64_32-memcpy.ll
    M llvm/test/CodeGen/AArch64/arm64_32-pointer-extend.ll
    M llvm/test/CodeGen/AArch64/arm64_32.ll
    M llvm/test/CodeGen/AArch64/bitfield.ll
    M llvm/test/CodeGen/AArch64/pr58431.ll
    M llvm/test/CodeGen/AArch64/swifterror.ll

  Log Message:
  -----------
  [AArch64] Use mov as opposed to And 0xffffffff (#98655)

This adds a tablegen pattern to use ORRWrr (mov) as opposed to i64 AND
0xffffffff, as the mov will implicitly clear the upper bits. This can be
seen as a zext(trunc(..)), and could be simpler if it is eliminated.



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