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, 1 deletions

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 3b3ee3e..ea41ec6 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5672,7 +5672,8 @@ void SelectionDAGBuilder::visitVAStart(const CallInst &I) {
 void SelectionDAGBuilder::visitVAArg(const VAArgInst &I) {
   SDValue V = DAG.getVAArg(TLI.getValueType(I.getType()), getCurDebugLoc(),
                            getRoot(), getValue(I.getOperand(0)),
-                           DAG.getSrcValue(I.getOperand(0)));
+                           DAG.getSrcValue(I.getOperand(0)),
+                           TLI.getTargetData()->getABITypeAlignment(I.getType()));
   setValue(&I, V);
   DAG.setRoot(V.getValue(1));
 }