[LLVMbugs] [Bug 18069] Arrays on stack are misaligned.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sun Dec 1 04:08:31 PST 2013


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

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

--- Comment #3 from Benjamin Kramer <benny.kra at gmail.com> ---
The x86_64 ABI requires the stack to be aligned at a 16 byte boundary when
entering a function and the compiler is safe to assume the alignment. Is there
something wrong with your setup code before going into the function?

i686-linux is more complicated. GCC unilaterally changed the alignment
assumption a couple of years ago to 16 bytes and we're following that now to
avoid breaking compatibility with GCC. The ABI requires only 4 bytes of
alignment and that's why you'll see stack realignment code on windows or

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