[PATCH] D155874: [llvm][SLP] Exit early if inputs to comparator are equal

[Alexey Bataev via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG8fa02db8cf82: [llvm][SLP] Exit early if inputs to comparator are equal (authored by davidberard98, committed by ABataev).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155874/new/

https://reviews.llvm.org/D155874

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp


Index: llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -4136,6 +4136,8 @@
     return TE.ReorderIndices;
   if (TE.State == TreeEntry::Vectorize && TE.getOpcode() == Instruction::PHI) {
     auto PHICompare = [](llvm::Value *V1, llvm::Value *V2) {
+      if (V1 == V2)
+        return false;
       if (!V1->hasOneUse() || !V2->hasOneUse())
         return false;
       auto *FirstUserOfPhi1 = cast<Instruction>(*V1->user_begin());


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