<div dir="ltr">On Sat, Jul 20, 2013 at 11:12 PM, Nadav Rotem <span dir="ltr"><<a href="mailto:nrotem@apple.com" target="_blank" class="cremed">nrotem@apple.com</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Author: nadav<br>
Date: Sun Jul 21 01:12:57 2013<br>
New Revision: 186786<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=186786&view=rev" target="_blank" class="cremed">http://llvm.org/viewvc/llvm-project?rev=186786&view=rev</a><br>
Log:<br>
Revert a part of r186420. Don't forbid multiple store chains that merge.<br></blockquote><div><br></div><div>Test case?</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<br>
Modified:<br>
    llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp<br>
<br>
Modified: llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp?rev=186786&r1=186785&r2=186786&view=diff" target="_blank" class="cremed">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp?rev=186786&r1=186785&r2=186786&view=diff</a><br>

==============================================================================<br>
--- llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp (original)<br>
+++ llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp Sun Jul 21 01:12:57 2013<br>
@@ -1700,10 +1700,8 @@ bool SLPVectorizer::vectorizeStores(Arra<br>
   // Do a quadratic search on all of the given stores and find<br>
   // all of the pairs of stores that follow each other.<br>
   for (unsigned i = 0, e = Stores.size(); i < e; ++i) {<br>
-    if (Heads.count(Stores[i]))<br>
-      continue;<br>
     for (unsigned j = 0; j < e; ++j) {<br>
-      if (i == j || Tails.count(Stores[j]))<br>
+      if (i == j)<br>
         continue;<br>
<br>
       if (R.isConsecutiveAccess(Stores[i], Stores[j])) {<br>
<br>
<br>
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</blockquote></div><br></div></div>