1  /* PR middle-end/55430 */
       2  /* { dg-do run { target mmap } } */
       3  /* { dg-options "-O2" } */
       4  
       5  #include <stddef.h>
       6  #include <stdio.h>
       7  #include <sys/mman.h>
       8  #ifndef MAP_ANONYMOUS
       9  #define MAP_ANONYMOUS MAP_ANON
      10  #endif
      11  #ifndef MAP_ANON
      12  #define MAP_ANON 0
      13  #endif
      14  #ifndef MAP_FAILED
      15  #define MAP_FAILED ((void *)-1)
      16  #endif
      17  #include <stdlib.h>
      18  
      19  struct S
      20  {
      21    unsigned int s1 : 8;
      22    unsigned int s2 : 2;
      23  };
      24  
      25  __attribute__((noinline, noclone)) int
      26  foo (int x, int y, struct S *z, unsigned int w)
      27  {
      28    if (z[y].s2 == x && z[y].s1 == w)
      29      return 1;
      30    return 0;
      31  }
      32  
      33  int
      34  main ()
      35  {
      36    char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,
      37  		  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
      38    if (p == MAP_FAILED)
      39      return 0;
      40    if (munmap (p + 65536, 65536) < 0)
      41      return 0;
      42    if ((65536 / sizeof (struct S)) * sizeof (struct S) != 65536)
      43      return 0;
      44    struct S *s = (struct S *) (p + 65536);
      45    return foo (0, 0, s - 1, 0) != 1;
      46  }