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SLPVectorizer: Don't vectorize volatile memory operations

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radar://15231682

Reapply r192799,
  http://lab.llvm.org:8011/builders/lldb-x86_64-debian-clang/builds/8226
showed that the bot is still broken even with this out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192820 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-10-16 17:52:40 +00:00
parent 48320e0de7
commit fc1604ec72
2 changed files with 51 additions and 3 deletions
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11
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -786,13 +786,14 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
}
case Instruction::Load: {
// Check if the loads are consecutive or of we need to swizzle them.
for (unsigned i = 0, e = VL.size() - 1; i < e; ++i)
if (!isConsecutiveAccess(VL[i], VL[i + 1])) {
for (unsigned i = 0, e = VL.size() - 1; i < e; ++i) {
LoadInst *L = cast<LoadInst>(VL[i]);
if (!L->isSimple() || !isConsecutiveAccess(VL[i], VL[i + 1])) {
newTreeEntry(VL, false);
DEBUG(dbgs() << "SLP: Need to swizzle loads.\n");
return;
}
}
newTreeEntry(VL, true);
DEBUG(dbgs() << "SLP: added a vector of loads.\n");
return;
@ -1911,6 +1912,10 @@ unsigned SLPVectorizer::collectStores(BasicBlock *BB, BoUpSLP &R) {
if (!SI)
continue;
// Don't touch volatile stores.
if (!SI->isSimple())
continue;
// Check that the pointer points to scalars.
Type *Ty = SI->getValueOperand()->getType();
if (Ty->isAggregateType() || Ty->isVectorTy())