[PATCH] D91589: [DAGCombiner] Fold (sext (not i1 x)) -> (add (zext i1 x), -1)

[Layton Kifer via Phabricator via llvm-commits]

laytonio updated this revision to Diff 307026.
laytonio added a comment.

Remove speculatively create (not i1 x), when not used.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91589/new/

https://reviews.llvm.org/D91589

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/AArch64/select_const.ll
  llvm/test/CodeGen/ARM/select_const.ll
  llvm/test/CodeGen/PowerPC/select_const.ll
  llvm/test/CodeGen/RISCV/sext-zext-trunc.ll
  llvm/test/CodeGen/SystemZ/sext-zext.ll
  llvm/test/CodeGen/X86/pr44140.ll

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