diff options
Diffstat (limited to 'lib/Transforms/Vectorize/SLPVectorizer.cpp')
-rw-r--r-- | lib/Transforms/Vectorize/SLPVectorizer.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/Transforms/Vectorize/SLPVectorizer.cpp b/lib/Transforms/Vectorize/SLPVectorizer.cpp index c1accd32c5..50e37e9916 100644 --- a/lib/Transforms/Vectorize/SLPVectorizer.cpp +++ b/lib/Transforms/Vectorize/SLPVectorizer.cpp @@ -898,8 +898,12 @@ int BoUpSLP::getTreeCost() { DEBUG(dbgs() << "SLP: Calculating cost for tree of size " << VectorizableTree.size() << ".\n"); - if (!VectorizableTree.size()) { - assert(!ExternalUses.size() && "We should not have any external users"); + // Don't vectorize tiny trees. Small load/store chains or consecutive stores + // of constants will be vectoried in SelectionDAG in MergeConsecutiveStores. + if (VectorizableTree.size() < 3) { + if (!VectorizableTree.size()) { + assert(!ExternalUses.size() && "We should not have any external users"); + } return 0; } |