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glibc  2.9
tst-stack-align.h
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00001 /* Copyright (C) 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdio.h>
00020 #include <stdint.h>
00021 
00022 #define TEST_STACK_ALIGN() \
00023   ({                                                                \
00024     /* AMD64 ABI mandates 16byte aligned stack.                            \
00025        Unfortunately, current GCC doesn't support __int128 or __float128     \
00026        types, so use aligned attribute instead.  */                        \
00027     struct _S                                                       \
00028       {                                                                    \
00029         int _i __attribute__((aligned (16)));                              \
00030        int _pad[3];                                                 \
00031       } _s = { ._i = 18 };                                          \
00032     double _d = 12.0;                                                      \
00033     long double _ld = 15.0;                                         \
00034     int _ret = 0;                                                   \
00035     printf ("__int128:  %d %p %zu\n", _s._i, &_s, __alignof (_s));         \
00036     if ((((uintptr_t) &_s) & (__alignof (_s) - 1)) != 0)                   \
00037       _ret = 1;                                                            \
00038                                                                     \
00039     printf ("double:  %g %p %zu\n", _d, &_d, __alignof (double));          \
00040     if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0)               \
00041       _ret = 1;                                                            \
00042                                                                     \
00043     printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, __alignof (long double));    \
00044     if ((((uintptr_t) &_ld) & (__alignof (long double) - 1)) != 0)         \
00045       _ret = 1;                                                            \
00046     _ret;                                                           \
00047     })