[PATCH] D62263: [DAGCombine][X86][AArch64][AMDGPU] (x - y) + -1 -> add (xor y, -1), x fold

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: RKSimon, craig.topper, spatel, arsenm.
lebedev.ri added a project: LLVM.
Herald added subscribers: kristof.beyls, t-tye, tpr, dstuttard, javed.absar, yaxunl, nhaehnle, wdng, jvesely, kzhuravl.

This prevents regressions in next patch,
and somewhat recovers from the regression to AMDGPU test in D62223 <https://reviews.llvm.org/D62223>.

https://rise4fun.com/Alive/ZRl


Repository:
  rL LLVM

https://reviews.llvm.org/D62263

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/xor.ll
  test/CodeGen/AMDGPU/llvm.amdgcn.s.barrier.ll
  test/CodeGen/X86/xor.ll

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