gcc/testsuite/gcc.c-torture/execute/usad-run.c

   1 extern void abort ();
   2 extern int abs (int __x) __attribute__ ((__nothrow__, __leaf__)) __attribute__ ((__const__));
   3
   4 static int
   5 foo (unsigned char *w, int i, unsigned char *x, int j)
   6 {
   7   int tot = 0;
   8   for (int a = 0; a < 16; a++)
   9     {
  10       for (int b = 0; b < 16; b++)
  11         tot += abs (w[b] - x[b]);
  12       w += i;
  13       x += j;
  14     }
  15   return tot;
  16 }
  17
  18 void
  19 bar (unsigned char *w, unsigned char *x, int i, int *result)
  20 {
  21   *result = foo (w, 16, x, i);
  22 }
  23
  24 int
  25 main (void)
  26 {
  27   unsigned char m[256];
  28   unsigned char n[256];
  29   int sum, i;
  30
  31   for (i = 0; i < 256; ++i)
  32     if (i % 2 == 0)
  33       {
  34         m[i] = (i % 8) * 2 + 1;
  35         n[i] = -(i % 8);
  36       }
  37     else
  38       {
  39         m[i] = -((i % 8) * 2 + 2);
  40         n[i] = -((i % 8) >> 1);
  41       }
  42
  43   bar (m, n, 16, &sum);
  44
  45   if (sum != 32384)
  46     abort ();
  47
  48   return 0;
  49 }