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.

llvm-svn: 108072

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index a9a7e5054b7..4f3866956ca 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -580,6 +580,7 @@ TargetLowering::TargetLowering(const TargetMachine &tm,
   JumpBufSize = 0;
   JumpBufAlignment = 0;
   PrefLoopAlignment = 0;
+  MinStackArgumentAlignment = 1;
   ShouldFoldAtomicFences = false;
 
   InitLibcallNames(LibcallRoutineNames);