sysdeps/i386/tst-stack-align.h

   1 /* Copyright (C) 2004-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <stdint.h>
  20
  21 typedef struct { int i[4]; } int_al16 __attribute__((aligned (16)));
  22
  23 #define TEST_STACK_ALIGN() \
  24   ({                                                                         \
  25     int_al16 _m;                                                             \
  26     double _d = 12.0;                                                        \
  27     long double _ld = 15.0;                                                  \
  28     int _ret = 0;                                                            \
  29     printf ("int_al16:  %p %zu\n", &_m, __alignof (int_al16));               \
  30     if ((((uintptr_t) &_m) & (__alignof (int_al16) - 1)) != 0)               \
  31       _ret = 1;                                                              \
  32                                                                              \
  33     printf ("double:  %g %p %zu\n", _d, &_d, __alignof (double));            \
  34     if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0)                 \
  35       _ret = 1;                                                              \
  36                                                                              \
  37     printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, __alignof (long double));    \
  38     if ((((uintptr_t) &_ld) & (__alignof (long double) - 1)) != 0)           \
  39       _ret = 1;                                                              \
  40     _ret;                                                                    \
  41     })