1  /* PR tree-optimization/83047 */
       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  __attribute__((noipa)) void
      20  foo (char *p, char *q, int r)
      21  {
      22    char a = q[0];
      23    if (r || a == '\0')
      24      return;
      25    char b = q[1];
      26    p[0] = a;
      27    p[1] = b;
      28  }
      29  
      30  int
      31  main ()
      32  {
      33    char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,
      34  		  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
      35    if (p == MAP_FAILED)
      36      return 0;
      37    if (munmap (p + 65536, 65536) < 0)
      38      return 0;
      39    p[0] = 'c';
      40    p[1] = 'd';
      41    p[65536 - 2] = 'a';
      42    p[65536 - 1] = 'b';
      43    volatile int r = 1;
      44    foo (p, p + 65536 - 2, r);
      45    if (p[0] != 'c' || p[1] != 'd')
      46      abort ();
      47    r = 0;
      48    foo (p, p + 65536 - 2, r);
      49    if (p[0] != 'a' || p[1] != 'b')
      50      abort ();
      51    p[0] = 'e';
      52    p[1] = 'f';
      53    r = 1;
      54    foo (p, p + 65536 - 1, r);
      55    if (p[0] != 'e' || p[1] != 'f')
      56      abort ();
      57    return 0;
      58  }