diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -7531,7 +7531,7 @@
     // Set P to nullptr to avoid re-analysis of phi node in
     // matchAssociativeReduction function unless this is the root node.
     P = nullptr;
-    if (Vectorize(Inst, R)) {
+    if (!isa<CmpInst>(Inst) && Vectorize(Inst, R)) {
       Res = true;
       continue;
     }
@@ -7543,7 +7543,8 @@
       for (auto *Op : Inst->operand_values())
         if (VisitedInstrs.insert(Op).second)
           if (auto *I = dyn_cast<Instruction>(Op))
-            if (!isa<PHINode>(I) && !R.isDeleted(I) && I->getParent() == BB)
+            if (!isa<PHINode>(I) && !isa<CmpInst>(I) && !R.isDeleted(I) &&
+                I->getParent() == BB)
               Stack.emplace_back(I, Level);
   }
   return Res;