[PATCH] D99427: [LoopIdiomRecognize] Teach CTLZ/CTTZ idiom recognition to handle not being able to find a pre-loop check for the input being 0.

[Craig Topper via Phabricator via llvm-commits]

craig.topper planned changes to this revision.
craig.topper added inline comments.


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Comment at: llvm/test/Transforms/LoopIdiom/X86/ctlz.ll:294
+; ALL:       while.body:
+; ALL-NEXT:    [[TCPHI:%.*]] = phi i32 [ [[TMP1]], [[WHILE_BODY_PREHEADER]] ], [ [[TCDEC:%.*]], [[WHILE_BODY]] ]
+; ALL-NEXT:    [[I_06:%.*]] = phi i32 [ [[INC:%.*]], [[WHILE_BODY]] ], [ 0, [[WHILE_BODY_PREHEADER]] ]
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I think this needs to be TMP3 not TMP1.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D99427/new/

https://reviews.llvm.org/D99427