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[SLP] Vectorize for all-constant entries.

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Differential Revision: http://reviews.llvm.org/D10531

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240144 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Zolotukhin
2015-06-19 17:40:15 +00:00
parent 826539160c
commit ad85d7a042
2 changed files with 20 additions and 2 deletions
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6
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -1637,8 +1637,10 @@ bool BoUpSLP::isFullyVectorizableTinyTree() {
if (VectorizableTree.size() != 2)
return false;
// Handle splat stores.
if (!VectorizableTree[0].NeedToGather && isSplat(VectorizableTree[1].Scalars))
// Handle splat and all-constants stores.
if (!VectorizableTree[0].NeedToGather &&
(allConstant(VectorizableTree[1].Scalars) ||
isSplat(VectorizableTree[1].Scalars)))
return true;
// Gathering cost would be too much for tiny trees.