[PATCH] D128123: [SDAG] try to replace subtract-from-constant with xor

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 441412.
spatel added a comment.
This revision is now accepted and ready to land.

Patch updated:
No code changes. Based on review comments, I added 2 AMD offset transform tests that show no diffs with this patch and test comments for the changed tests in case there is motivation to restore those patterns.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128123/new/

https://reviews.llvm.org/D128123

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/X86/X86InstrCompiler.td
  llvm/test/CodeGen/AArch64/sub1.ll
  llvm/test/CodeGen/AMDGPU/ds-sub-offset.ll
  llvm/test/CodeGen/AMDGPU/setcc-multiple-use.ll
  llvm/test/CodeGen/ARM/intrinsics-overflow.ll
  llvm/test/CodeGen/ARM/usub_sat.ll
  llvm/test/CodeGen/ARM/usub_sat_plus.ll
  llvm/test/CodeGen/PowerPC/bool-math.ll
  llvm/test/CodeGen/PowerPC/select_const.ll
  llvm/test/CodeGen/RISCV/atomic-rmw.ll
  llvm/test/CodeGen/RISCV/atomic-signext.ll
  llvm/test/CodeGen/SPARC/64bit.ll

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