[LLVMbugs] [Bug 12506] wrong Sizeof struct

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12506

Benjamin Kramer <benny.kra at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |benny.kra at gmail.com
         Resolution|                            |INVALID

--- Comment #1 from Benjamin Kramer <benny.kra at gmail.com> 2012-04-09 14:21:00 CDT ---
The x86_64 ABI requires doubles to be aligned on a 8 byte boundary (the address
has to be a multiple of 8). In your example the compiler adds 4 bytes of
padding to ensure that.

You can pass -Wpadded to clang and it will warn you when it inserts padding
bytes.

http://en.wikipedia.org/wiki/Data_structure_alignment#Data_structure_padding

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