Revert "SLPVectorizer: Don't vectorize volatile memory operations"

This speculatively reverts commit 192799. It might have broken a linux buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192816 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 8 deletions

diff --git a/lib/Transforms/Vectorize/SLPVectorizer.cpp b/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 4d82bc4..af1c0e7 100644
--- a/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -786,14 +786,13 @@ 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) {
-        LoadInst *L = cast<LoadInst>(VL[i]);
-        if (!L->isSimple() || !isConsecutiveAccess(VL[i], VL[i + 1])) {
+      for (unsigned i = 0, e = VL.size() - 1; i < e; ++i)
+        if (!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;
@@ -1912,10 +1911,6 @@ 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())