Fix va_arg for doubles. With this patch VAARG nodes always contain the

correct alignment information, which simplifies ExpandRes_VAARG a bit.

The patch introduces a new alignment information to TargetLoweringInfo. This is
needed since the two natural candidates cannot be used:

* The 's' in target data: If this is set to the minimal alignment of any
  argument, getCallFrameTypeAlignment would return 4 for doubles on ARM for
  example.
* The getTransientStackAlignment method. It is possible for an architecture to
  have argument less aligned than what we maintain the stack pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108072 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 5 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
index 71adb33..9c2b1d9 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
@@ -243,13 +243,10 @@ void DAGTypeLegalizer::ExpandRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi) {
   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);
+  const unsigned Align = N->getConstantOperandVal(3);
 
   Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2), Align);
-  Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2));
+  Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2), 0);
 
   // Handle endianness of the load.
   if (TLI.isBigEndian())