Use ASTContext::getDeclAlign(<Field Decl>) to get the alignment of the first

field to be memcpy'd, rather instead of ASTContext::getTypeAlign(<Field Type>).
For packed structs the alignment of a field may be less than the alignment of
the field's type.

<rdar://problem/13338585>

llvm-svn: 176512

1 files changed, 1 insertions, 3 deletions

diff --git a/clang/lib/CodeGen/CGClass.cpp b/clang/lib/CodeGen/CGClass.cpp
index ac2dada0834..4319e43b91b 100644
--- a/clang/lib/CodeGen/CGClass.cpp
+++ b/clang/lib/CodeGen/CGClass.cpp
@@ -794,9 +794,7 @@ namespace {
         const CGBitFieldInfo &BFInfo = RL.getBitFieldInfo(FirstField);
         Alignment = CharUnits::fromQuantity(BFInfo.StorageAlignment);
       } else {
-        unsigned AlignBits =
-          CGF.getContext().getTypeAlign(FirstField->getType());
-        Alignment = CGF.getContext().toCharUnitsFromBits(AlignBits);
+        Alignment = CGF.getContext().getDeclAlign(FirstField);
       }
 
       assert((CGF.getContext().toCharUnitsFromBits(FirstFieldOffset) %