[Bug c/65672] type attribute "aligned" can decrease alignment

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65672

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-01-26
                 CC|                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |4.5.3, 4.8.3, 4.9.3, 5.3.0,
                   |                            |6.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with today's trunk and prior major versions.  See also the duplicate
bug 69502.

$ cat t.c && /home/msebor/build/gcc-trunk-git/gcc/xgcc
-B/home/msebor/build/gcc-trunk-git/gcc -S -Wall -Wextra -Wpedantic -o/dev/null
-std=c11 t.c
typedef float vec __attribute__ ((vector_size( 16)));
typedef float vecu __attribute__ ((vector_size (16), aligned (8)));

#define Assert(e) _Static_assert (e, #e)

Assert (__alignof__ (vec) == 16);
Assert (__alignof__ (vecu) == 8);