[PATCH] D142756: AMDGPU: Try to select fneg modifier from xor

[Matt Arsenault via Phabricator via llvm-commits]

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I'm somewhat unhappy with needing to do this. Ideally we could
unconditionally turn all of these into fnegs, but that's going
to confuse other integer patterns that want to look for xor. We
either have to complicate those, or special case this.


https://reviews.llvm.org/D142756

Files:
  llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
  llvm/test/CodeGen/AMDGPU/fneg-modifier-casting.ll
  llvm/test/CodeGen/AMDGPU/saddsat.ll
  llvm/test/CodeGen/AMDGPU/ssubsat.ll

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