[AArch64] Fix incorrect MachinePointerInfo in splitStoreSplat

When splitting up one store into several in splitStoreSplat we have to
make sure we get the MachinePointerInfo right, otherwise alias
analysis thinks they all store to the same location. This can then
cause invalid scheduling later on.

Differential Revision: https://reviews.llvm.org/D29446

llvm-svn: 294203

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 8fb9c5c4a38..5d2d4b114a2 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -8923,8 +8923,9 @@ static SDValue splitStoreSplat(SelectionDAG &DAG, StoreSDNode &St,
   // instructions (stp).
   SDLoc DL(&St);
   SDValue BasePtr = St.getBasePtr();
+  const MachinePointerInfo &PtrInfo = St.getPointerInfo();
   SDValue NewST1 =
-      DAG.getStore(St.getChain(), DL, SplatVal, BasePtr, St.getPointerInfo(),
+      DAG.getStore(St.getChain(), DL, SplatVal, BasePtr, PtrInfo,
                    OrigAlignment, St.getMemOperand()->getFlags());
 
   unsigned Offset = EltOffset;
@@ -8933,7 +8934,7 @@ static SDValue splitStoreSplat(SelectionDAG &DAG, StoreSDNode &St,
     SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i64, BasePtr,
                                     DAG.getConstant(Offset, DL, MVT::i64));
     NewST1 = DAG.getStore(NewST1.getValue(0), DL, SplatVal, OffsetPtr,
-                          St.getPointerInfo(), Alignment,
+                          PtrInfo.getWithOffset(Offset), Alignment,
                           St.getMemOperand()->getFlags());
     Offset += EltOffset;
   }