gcc/testsuite/gcc.dg/pr83047.c

   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 }