[all-commits] [llvm/llvm-project] 272bd5: [AArch64] Fix abs(sub nsw) -> absd

Ricardo Jesus via All-commits all-commits at lists.llvm.org
Wed Feb 22 01:17:52 PST 2023

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 272bd573dc4a2d0dc3c2102621bec32dd2f2988f
  Author: Ricardo Jesus <rjj at nvidia.com>
  Date:   2023-02-22 (Wed, 22 Feb 2023)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/lib/Target/X86/X86ISelLowering.h
    M llvm/test/CodeGen/AArch64/sve-saba.ll

  Log Message:
  [AArch64] Fix abs(sub nsw) -> absd

This partially reverts a regression introduced in 8f25e382c5b1 for
AArch64 targets. In particular, we restore the logic of `(abs (sub nsw
x, y)) -> abds(x, y)` for all targets except X86, which keeps the logic
introduced in 8f25e382c5b1. See also https://reviews.llvm.org/D142288.

Differential Revision: https://reviews.llvm.org/D144379

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