From: Nadav Rotem <nrotem@apple.com>
Date: Sat, 27 Jul 2013 23:28:47 +0000 (+0000)
Subject: Update the comment
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1aaaf3415466d4c59fbab3c4f4ce66bff442e65a;p=oota-llvm.git

Update the comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187316 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Vectorize/SLPVectorizer.cpp b/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 50e37e99169..db1a91ec9e3 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");