gcc/testsuite/gcc.dg/pr84503-1.c

   1 /* PR tree-optimization/84503 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O3" } */
   4
   5 typedef __SIZE_TYPE__ size_t;
   6 typedef __UINTPTR_TYPE__ uintptr_t;
   7
   8 struct S { int a; unsigned short b; int c, d, e; long f, g, h; int i, j; };
   9 static struct S *k;
  10 static size_t l = 0;
  11 int m;
  12
  13 static int
  14 bar (void)
  15 {
  16   unsigned i;
  17   int j;
  18   if (k[0].c == 0)
  19     {
  20       ++m;
  21       size_t n = l * 2;
  22       struct S *o;
  23       o = (struct S *) __builtin_realloc (k, sizeof (struct S) * n);
  24       if (!o)
  25         __builtin_exit (0);
  26       k = o;
  27       for (i = l; i < n; i++)
  28         {
  29           void *p = (void *) &k[i];
  30           int q = 0;
  31           size_t r = sizeof (struct S);
  32           if ((((uintptr_t) p) % __alignof__ (long)) == 0
  33               && r % sizeof (long) == 0)
  34             {
  35               long __attribute__ ((may_alias)) *s = (long *) p;
  36               long *t = (long *) ((char *) s + r);
  37               while (s < t)
  38                 *s++ = 0;
  39             }
  40           else
  41             __builtin_memset (p, q, r);
  42           k[i].c = i + 1;
  43           k[i].a = -1;
  44         }
  45       k[n - 1].c = 0;
  46       k[0].c = l;
  47       l = n;
  48     }
  49   j = k[0].c;
  50   k[0].c = k[j].c;
  51   return j;
  52 }
  53
  54 int
  55 main ()
  56 {
  57   k = (struct S *) __builtin_malloc (sizeof (struct S));
  58   if (!k)
  59     __builtin_exit (0);
  60   __builtin_memset (k, '\0', sizeof (struct S));
  61   k->a = -1;
  62   l = 1;
  63   for (int i = 0; i < 15; ++i)
  64     bar ();
  65   if (m != 4)
  66     __builtin_abort ();
  67   return 0;
  68 }