From: Nadav Rotem <nrotem@apple.com>
Date: Fri, 21 Jun 2013 04:18:13 +0000 (+0000)
Subject: SLP Vectorizer: do not search for store-chains that are wider than the vector-registe... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=de26195f3c09f7815161037b3227c34c6cc0afdb;p=oota-llvm.git

SLP Vectorizer: do not search for store-chains that are wider than the vector-register size.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184527 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Vectorize/VecUtils.cpp b/lib/Transforms/Vectorize/VecUtils.cpp
index 16189860420..3db4adf95c8 100644
--- a/lib/Transforms/Vectorize/VecUtils.cpp
+++ b/lib/Transforms/Vectorize/VecUtils.cpp
@@ -141,9 +141,11 @@ bool BoUpSLP::vectorizeStoreChain(ArrayRef<Value *> Chain, int CostThreshold) {
     }
   }
 
-  if (Changed)
-    return true;
+  if (Changed || ChainLen > VF)
+    return Changed;
 
+  // Handle short chains. This helps us catch types such as <3 x float> that
+  // are smaller than vector size.
   int Cost = getTreeCost(Chain);
   if (Cost < CostThreshold) {
     DEBUG(dbgs() << "SLP: Found store chain cost = " << Cost