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Diffstat (limited to 'lib/Transforms/Vectorize/SLPVectorizer.cpp')
| -rw-r--r-- | lib/Transforms/Vectorize/SLPVectorizer.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Transforms/Vectorize/SLPVectorizer.cpp b/lib/Transforms/Vectorize/SLPVectorizer.cpp index 50e37e9..db1a91e 100644 --- a/lib/Transforms/Vectorize/SLPVectorizer.cpp +++ b/lib/Transforms/Vectorize/SLPVectorizer.cpp @@ -900,6 +900,7 @@ int BoUpSLP::getTreeCost() { // Don't vectorize tiny trees. Small load/store chains or consecutive stores // of constants will be vectoried in SelectionDAG in MergeConsecutiveStores. + // The SelectionDAG vectorizer can only handle pairs (trees of height = 2). if (VectorizableTree.size() < 3) { if (!VectorizableTree.size()) { assert(!ExternalUses.size() && "We should not have any external users"); |