set the cost of tiny trees to INT_MAX in SLP vectorizer to disable vectorization on them

llvm-svn: 191314

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index b0c4894d358..b8e57de53be 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -947,7 +947,7 @@ int BoUpSLP::getTreeCost() {
     if (!VectorizableTree.size()) {
       assert(!ExternalUses.size() && "We should not have any external users");
     }
-    return 0;
+    return INT_MAX;
   }
 
   unsigned BundleWidth = VectorizableTree[0].Scalars.size();