gcc/testsuite/c-c++-common/torture/builtin-clear-padding-4.c

   1 /* { dg-require-effective-target alloca } */
   2
   3 /* PR libstdc++/88101 */
   4
   5 struct S { char a; short b; char c; };
   6
   7 __attribute__((noipa)) void
   8 foo (int m, int n, int o)
   9 {
  10   long double a1[m];
  11   long double a2[m];
  12   struct S b1[m][n];
  13   struct S b2[m][n];
  14   struct S c1[m][n][o];
  15   struct S c2[m][n][o];
  16   int i, j, k;
  17   __builtin_memset (&a1, 0, sizeof (a1));
  18   __builtin_memset (&a2, ~0, sizeof (a2));
  19   __builtin_memset (&b1, 0, sizeof (b1));
  20   __builtin_memset (&b2, ~0, sizeof (b2));
  21   __builtin_memset (&c1, 0, sizeof (c1));
  22   __builtin_memset (&c2, ~0, sizeof (c2));
  23   for (i = 0; i < m; i++)
  24     {
  25       a1[i] = 13.132L;
  26       a2[i] = 13.132L;
  27       for (j = 0; j < n; j++)
  28         {
  29           b1[i][j].a = -1;
  30           b1[i][j].b = -1;
  31           b1[i][j].c = -1;
  32           b2[i][j].a = -1;
  33           b2[i][j].b = -1;
  34           b2[i][j].c = -1;
  35           for (k = 0; k < o; k++)
  36             {
  37               c1[i][j][k].a = -1;
  38               c1[i][j][k].b = -1;
  39               c1[i][j][k].c = -1;
  40               c2[i][j][k].a = -1;
  41               c2[i][j][k].b = -1;
  42               c2[i][j][k].c = -1;
  43             }
  44         }
  45     }
  46   __builtin_clear_padding (&a2);
  47   __builtin_clear_padding (&b2);
  48   __builtin_clear_padding (&c2);
  49   if (__builtin_memcmp (&a1, &a2, sizeof (a1))
  50       || __builtin_memcmp (&b1, &b2, sizeof (b1))
  51       || __builtin_memcmp (&c1, &c2, sizeof (c1)))
  52     __builtin_abort ();
  53 }
  54
  55 int
  56 main ()
  57 {
  58   foo (5, 3, 4);
  59   foo (17, 2, 1);
  60   return 0;
  61 }