Add llvm patch corresponding to r289072.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=289081
@ -0,0 +1,50 @@
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Temporarily revert upstream llvm trunk r240144 (by Michael Zolotukhin):
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[SLP] Vectorize for all-constant entries.
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This should fix libc++'s iostream initialization SIGBUSing whenever the
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global cout symbol is not aligned to 16 bytes.
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Introduced here: http://svnweb.freebsd.org/changeset/base/289072
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Index: lib/Transforms/Vectorize/SLPVectorizer.cpp
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===================================================================
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--- lib/Transforms/Vectorize/SLPVectorizer.cpp
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+++ lib/Transforms/Vectorize/SLPVectorizer.cpp
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@@ -1642,10 +1642,8 @@ bool BoUpSLP::isFullyVectorizableTinyTree() {
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if (VectorizableTree.size() != 2)
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return false;
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- // Handle splat and all-constants stores.
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- if (!VectorizableTree[0].NeedToGather &&
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- (allConstant(VectorizableTree[1].Scalars) ||
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- isSplat(VectorizableTree[1].Scalars)))
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+ // Handle splat stores.
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+ if (!VectorizableTree[0].NeedToGather && isSplat(VectorizableTree[1].Scalars))
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return true;
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// Gathering cost would be too much for tiny trees.
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Index: test/Transforms/SLPVectorizer/X86/tiny-tree.ll
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===================================================================
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--- test/Transforms/SLPVectorizer/X86/tiny-tree.ll
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+++ test/Transforms/SLPVectorizer/X86/tiny-tree.ll
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@@ -153,19 +153,3 @@ define void @store_splat(float*, float) {
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store float %1, float* %6, align 4
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ret void
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}
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-
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-
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-; CHECK-LABEL: store_const
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-; CHECK: store <4 x i32>
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-define void @store_const(i32* %a) {
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-entry:
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- %ptr0 = getelementptr inbounds i32, i32* %a, i64 0
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- store i32 10, i32* %ptr0, align 4
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- %ptr1 = getelementptr inbounds i32, i32* %a, i64 1
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- store i32 30, i32* %ptr1, align 4
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- %ptr2 = getelementptr inbounds i32, i32* %a, i64 2
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- store i32 20, i32* %ptr2, align 4
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- %ptr3 = getelementptr inbounds i32, i32* %a, i64 3
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- store i32 40, i32* %ptr3, align 4
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- ret void
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-}
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