[all-commits] [llvm/llvm-project] 851462: [AArch64] Remove invalid uabdl patterns. (#89272)

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 851462fcaa7f6e3301865de84f98be7e872e64b6
      https://github.com/llvm/llvm-project/commit/851462fcaa7f6e3301865de84f98be7e872e64b6
  Author: David Green <david.green at arm.com>
  Date:   2024-04-19 (Fri, 19 Apr 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/test/CodeGen/AArch64/arm64-vabs.ll

  Log Message:
  -----------
  [AArch64] Remove invalid uabdl patterns. (#89272)

These were added in https://reviews.llvm.org/D14208, which look like
they attempt to detect abs from xor+add+ashr. They do not appear to be
detecting the correct value for the src input though, which I think is
intended to be the sub(zext, zext) part of the pattern. We have pattens
from abs now, so the old invalid patterns can be removed.

Fixes #88784



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