When splitting a VAARG, remember its alignment.

This produces terrible but correct code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106952 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 2 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
index 88e1e624ae..71adb33617 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
@@ -238,12 +238,17 @@ void DAGTypeLegalizer::ExpandRes_NormalLoad(SDNode *N, SDValue &Lo,
 }
 
 void DAGTypeLegalizer::ExpandRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi) {
-  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
+  EVT OVT = N->getValueType(0);
+  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), OVT);
   SDValue Chain = N->getOperand(0);
   SDValue Ptr = N->getOperand(1);
   DebugLoc dl = N->getDebugLoc();
+  const unsigned OldAlign = N->getConstantOperandVal(3);
+  const Type *Type = OVT.getTypeForEVT(*DAG.getContext());
+  const unsigned TypeAlign = TLI.getTargetData()->getABITypeAlignment(Type);
+  const unsigned Align = std::max(OldAlign, TypeAlign);
 
-  Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2));
+  Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2), Align);
   Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2));
 
   // Handle endianness of the load.