gcc/testsuite/gcc.target/powerpc/sad-vectorize-3.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target p9vector_hw } */
   3 /* { dg-options "-O3 -mdejagnu-cpu=power9" } */
   4
   5 /* Verify that we get correct code when we vectorize this SAD loop using
   6    vabsdub. */
   7
   8 extern void abort ();
   9 extern int abs (int __x) __attribute__ ((__nothrow__, __leaf__)) __attribute__ ((__const__));
  10
  11 static int
  12 foo (unsigned char *w, int i, unsigned char *x, int j)
  13 {
  14   int tot = 0;
  15   for (int a = 0; a < 16; a++)
  16     {
  17       for (int b = 0; b < 16; b++)
  18         tot += abs (w[b] - x[b]);
  19       w += i;
  20       x += j;
  21     }
  22   return tot;
  23 }
  24
  25 void
  26 bar (unsigned char *w, unsigned char *x, int i, int *result)
  27 {
  28   *result = foo (w, 16, x, i);
  29 }
  30
  31 int
  32 main ()
  33 {
  34   unsigned char m[256];
  35   unsigned char n[256];
  36   int sum, i;
  37
  38   for (i = 0; i < 256; ++i)
  39     if (i % 2 == 0)
  40       {
  41         m[i] = (i % 8) * 2 + 1;
  42         n[i] = -(i % 8);
  43       }
  44     else
  45       {
  46         m[i] = -((i % 8) * 2 + 2);
  47         n[i] = -((i % 8) >> 1);
  48       }
  49
  50   bar (m, n, 16, &sum);
  51
  52   if (sum != 32384)
  53     abort ();
  54
  55   return 0;
  56 }