Vendor import of llvm release_50 branch r319231:vendor/llvm/llvm-release_50-r319231

https://llvm.org/svn/llvm-project/llvm/branches/release_50@319231

1 files changed, 14 insertions, 5 deletions

diff --git a/lib/Target/AArch64/AArch64ISelLowering.cpp b/lib/Target/AArch64/AArch64ISelLowering.cpp
index 9d879886d39d..9c57926da5f5 100644
--- a/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -9347,11 +9347,20 @@ static SDValue replaceZeroVectorStore(SelectionDAG &DAG, StoreSDNode &St) {
       return SDValue();
   }
 
-  // Use WZR/XZR here to prevent DAGCombiner::MergeConsecutiveStores from
-  // undoing this transformation.
-  SDValue SplatVal = VT.getVectorElementType().getSizeInBits() == 32
-                         ? DAG.getRegister(AArch64::WZR, MVT::i32)
-                         : DAG.getRegister(AArch64::XZR, MVT::i64);
+  // Use a CopyFromReg WZR/XZR here to prevent
+  // DAGCombiner::MergeConsecutiveStores from undoing this transformation.
+  SDLoc DL(&St);
+  unsigned ZeroReg;
+  EVT ZeroVT;
+  if (VT.getVectorElementType().getSizeInBits() == 32) {
+    ZeroReg = AArch64::WZR;
+    ZeroVT = MVT::i32;
+  } else {
+    ZeroReg = AArch64::XZR;
+    ZeroVT = MVT::i64;
+  }
+  SDValue SplatVal =
+      DAG.getCopyFromReg(DAG.getEntryNode(), DL, ZeroReg, ZeroVT);
   return splitStoreSplat(DAG, St, SplatVal, NumVecElts);
 }