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

   1 /* { dg-do run { target { powerpc*-*-linux* && { lp64 && p9vector_hw } } } } */
   2 /* { dg-require-effective-target powerpc_p9vector_ok } */
   3 /* { dg-options "-O3 -mcpu=power9" } */
   4 /* { dg-skip-if "do not override -mcpu" { powerpc*-*-* } { "-mcpu=*" } { "-mcpu=power9" } } */
   5
   6 /* Verify that we get correct code when we vectorize this SAD loop using
   7    vabsdub. */
   8
   9 extern void abort ();
  10 extern int abs (int __x) __attribute__ ((__nothrow__, __leaf__)) __attribute__ ((__const__));
  11
  12 static int
  13 foo (unsigned char *w, int i, unsigned char *x, int j)
  14 {
  15   int tot = 0;
  16   for (int a = 0; a < 16; a++)
  17     {
  18       for (int b = 0; b < 16; b++)
  19         tot += abs (w[b] - x[b]);
  20       w += i;
  21       x += j;
  22     }
  23   return tot;
  24 }
  25
  26 void
  27 bar (unsigned char *w, unsigned char *x, int i, int *result)
  28 {
  29   *result = foo (w, 16, x, i);
  30 }
  31
  32 int
  33 main ()
  34 {
  35   unsigned char m[256];
  36   unsigned char n[256];
  37   int sum, i;
  38
  39   for (i = 0; i < 256; ++i)
  40     if (i % 2 == 0)
  41       {
  42         m[i] = (i % 8) * 2 + 1;
  43         n[i] = -(i % 8);
  44       }
  45     else
  46       {
  47         m[i] = -((i % 8) * 2 + 2);
  48         n[i] = -((i % 8) >> 1);
  49       }
  50
  51   bar (m, n, 16, &sum);
  52
  53   if (sum != 32384)
  54     abort ();
  55
  56   return 0;
  57 }