[PATCH] D101074: [X86] Canonicalize LT/GT compares with constants to use LE/GE to reduce the number of EFLAGs reads. (PR48760)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/test/CodeGen/X86/ctpop-combine.ll:45
+; POPCOUNT-NEXT:    cmpb $1, %cl
+; POPCOUNT-NEXT:    setbe %al
 ; POPCOUNT-NEXT:    retq
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Regression - we go from a CF read to CF+ZF reads - it looks in most cases the LT->LE conversions are going to cause this - I think I'm going to just handle the GT->GE cases initially.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D101074/new/

https://reviews.llvm.org/D101074