gcc/testsuite/gcc.dg/bf-ms-layout-3.c

   1 /* Test for MS bitfield layout */
   2 /* { dg-do run { target *-*-mingw* *-*-cygwin* i?86-*-* x86_64-*-* } } */
   3
   4 extern void abort();
   5
   6 struct s1_t {
   7     char a;
   8     char b __attribute__ ((aligned (16)));
   9 } __attribute__ ((ms_struct));
  10 struct s1_t s1;
  11
  12 struct s2_t {
  13   char a;
  14   char b;
  15 } __attribute__ ((ms_struct));
  16 struct s2_t s2;
  17
  18 struct s3_t {
  19   __extension__ char a : 6;
  20   char b __attribute__ ((aligned (16)));
  21 } __attribute__ ((ms_struct));
  22 struct s3_t s3;
  23
  24 struct s4_t {
  25   __extension__ char a : 6;
  26   char b __attribute__ ((aligned (2)));
  27 } __attribute__ ((ms_struct));
  28 struct s4_t s4;
  29
  30 struct s5_t {
  31   __extension__ char a : 6;
  32   char b __attribute__ ((aligned (1)));
  33 } __attribute__ ((ms_struct));
  34 struct s5_t s5;
  35
  36 __extension__
  37 static __PTRDIFF_TYPE__ offs (const void *a, const void *b)
  38 {
  39   return (__PTRDIFF_TYPE__) ((const char*)a  - (const char*)b);
  40 }
  41
  42 int main()
  43 {
  44   if (offs (&s1.b, &s1) != 16
  45       || offs (&s2.b, &s2) != 1
  46       || offs (&s3.b, &s3) != 16
  47       || offs (&s4.b, &s4) != 2
  48       || offs (&s5.b, &s5) != 1)
  49     abort ();
  50   return 0;
  51 }
  52