Index: llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -9100,7 +9100,10 @@
   // Mark the loop as already vectorized to avoid vectorizing again.
   Hints.setAlreadyVectorized();
 
+#ifdef EXPENSIVE_CHECKS
   assert(!verifyFunction(*L->getHeader()->getParent(), &dbgs()));
+#endif
+
   return true;
 }
 
@@ -9437,7 +9440,10 @@
     Hints.setAlreadyVectorized();
   }
 
+#ifdef EXPENSIVE_CHECKS
   assert(!verifyFunction(*L->getHeader()->getParent(), &dbgs()));
+#endif
+
   return true;
 }