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>


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176512 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 3 deletions

diff --git a/lib/CodeGen/CGClass.cpp b/lib/CodeGen/CGClass.cpp
index ac2dada083..4319e43b91 100644
--- a/lib/CodeGen/CGClass.cpp
+++ b/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) %