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
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 87220a5..7a47da4 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2658,7 +2658,9 @@
false, false, 0);
SDValue VAList = VAListLoad;
- if (Align != 0 ) {
+ if (Align > TLI.getMinStackArgumentAlignment()) {
+ assert(((Align & (Align-1)) == 0) && "Expected Align to be a power of 2");
+
VAList = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), VAList,
DAG.getConstant(Align - 1,
TLI.getPointerTy()));