Index: llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
===================================================================
--- llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
+++ llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
@@ -1422,6 +1422,7 @@
   EVT DstVT = N->getValueType(0);
   ISD::MemIndexedMode AM = LD->getAddressingMode();
   bool IsPre = AM == ISD::PRE_INC || AM == ISD::PRE_DEC;
+  bool IsDec = AM == ISD::PRE_DEC || AM == ISD::POST_DEC;
 
   // We're not doing validity checking here. That was done when checking
   // if we should mark the load as indexed or not. We're just selecting
@@ -1486,6 +1487,7 @@
   SDValue Base = LD->getBasePtr();
   ConstantSDNode *OffsetOp = cast<ConstantSDNode>(LD->getOffset());
   int OffsetVal = (int)OffsetOp->getZExtValue();
+  OffsetVal = IsDec ? -OffsetVal : OffsetVal;
   SDLoc dl(N);
   SDValue Offset = CurDAG->getTargetConstant(OffsetVal, dl, MVT::i64);
   SDValue Ops[] = { Base, Offset, Chain };