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SLPVectorizer: fix wrong scheduling of atomic load/stores.

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This fixes PR22306.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227077 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Erik Eckstein
2015-01-26 09:07:04 +00:00
parent 56471c4aec
commit 8f6e8cb4f6
2 changed files with 43 additions and 1 deletions
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13
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@@ -309,6 +309,17 @@ static AliasAnalysis::Location getLocation(Instruction *I, AliasAnalysis *AA) {
return AliasAnalysis::Location();
}
/// \returns True if the instruction is not a volatile or atomic load/store.
static bool isSimple(Instruction *I) {
if (LoadInst *LI = dyn_cast<LoadInst>(I))
return LI->isSimple();
if (StoreInst *SI = dyn_cast<StoreInst>(I))
return SI->isSimple();
if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(I))
return !MI->isVolatile();
return true;
}
/// Bottom Up SLP Vectorizer.
class BoUpSLP {
public:
@@ -501,7 +512,7 @@ private:
}
AliasAnalysis::Location Loc2 = getLocation(Inst2, AA);
bool aliased = true;
if (Loc1.Ptr && Loc2.Ptr) {
if (Loc1.Ptr && Loc2.Ptr && isSimple(Inst1) && isSimple(Inst2)) {
// Do the alias check.
aliased = AA->alias(Loc1, Loc2);
}