[PATCH] D57637: [X86] Lower ISD::UADDO to use the Z flag instead of C flag when the RHS is a constant 1 to encourage INC formation.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.
Herald added a subscriber: javed.absar.
Herald added a project: LLVM.

Add an additional combine to combineCarryThroughADD to reverse it back to the C flag.

I believe this catches the cases that D57547 <https://reviews.llvm.org/D57547> got.


Repository:
  rL LLVM

https://reviews.llvm.org/D57637

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/codegen-prepare-uaddo.ll
  test/CodeGen/X86/combine-add-usat.ll
  test/CodeGen/X86/scheduler-backtracking.ll
  test/CodeGen/X86/slow-incdec.ll
  test/CodeGen/X86/xaluo.ll

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