[PATCH] D144379: [AArch64] Fix abs(sub nsw) -> absd

[Ricardo Jesus via Phabricator via llvm-commits]

rjj created this revision.
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This partially reverts a regression introduced in 8f25e382c5b1 <https://reviews.llvm.org/rG8f25e382c5b1bbaafd738f44de856c85ce845bbe> 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 <https://reviews.llvm.org/rG8f25e382c5b1bbaafd738f44de856c85ce845bbe>. See also https://reviews.llvm.org/D142288.


https://reviews.llvm.org/D144379

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

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