[llvm-commits] [llvm-gcc-4.0] r46338 - /llvm-gcc-4.0/trunk/gcc/llvm-types.cpp

[Devang Patel]

Author: dpatel
Date: Thu Jan 24 18:43:54 2008
New Revision: 46338

URL: http://llvm.org/viewvc/llvm-project?rev=46338&view=rev
Log:
Fix 2008-01-24-StructAlignAndBitFields.c test case.
Bit-field type does not influence struct alignment.


Modified:
    llvm-gcc-4.0/trunk/gcc/llvm-types.cpp

Modified: llvm-gcc-4.0/trunk/gcc/llvm-types.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm-gcc-4.0/trunk/gcc/llvm-types.cpp?rev=46338&r1=46337&r2=46338&view=diff

==============================================================================
--- llvm-gcc-4.0/trunk/gcc/llvm-types.cpp (original)
+++ llvm-gcc-4.0/trunk/gcc/llvm-types.cpp Thu Jan 24 18:43:54 2008
@@ -1529,9 +1529,14 @@
 
   // Handle bit-fields specially.
   if (DECL_BIT_FIELD_TYPE(Field)) {
-    DecodeStructBitField(Field, Info);
-    return true;
-  }
+     // Bit-field type does not influence structure alignment. 
+     // For example, struct A { char a; short b; int c:25; char d; } does not
+     // have 4 byte alignment. To enforce this rule, always use packed struct.
+     if (!Info.isPacked())
+       return false;
+     DecodeStructBitField(Field, Info);
+     return true;
+   }
 
   Info.allFieldsAreNotBitFields();