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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.

16
test/Transforms/SLPVectorizer/X86/tiny-tree.ll
View File

@ -153,3 +153,19 @@ define void @store_splat(float*, float) {
store float %1, float* %6, align 4
ret void
}
; CHECK-LABEL: store_const
; CHECK: store <4 x i32>
define void @store_const(i32* %a) {
entry:
%ptr0 = getelementptr inbounds i32, i32* %a, i64 0
store i32 10, i32* %ptr0, align 4
%ptr1 = getelementptr inbounds i32, i32* %a, i64 1
store i32 30, i32* %ptr1, align 4
%ptr2 = getelementptr inbounds i32, i32* %a, i64 2
store i32 20, i32* %ptr2, align 4
%ptr3 = getelementptr inbounds i32, i32* %a, i64 3
store i32 40, i32* %ptr3, align 4
ret void
}