gcc/testsuite/gcc.target/powerpc/sad-vectorize-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 -mdejagnu-cpu=power9 -mvsx" } */
   3 /* { dg-require-effective-target powerpc_vsx } */
   4
   5 /* Verify that we vectorize this SAD loop using vabsduh. */
   6
   7 extern int abs (int __x) __attribute__ ((__nothrow__, __leaf__)) __attribute__ ((__const__));
   8
   9 static int
  10 foo (unsigned short *w, int i, unsigned short *x, int j)
  11 {
  12   int tot = 0;
  13   for (int a = 0; a < 16; a++)
  14     {
  15       for (int b = 0; b < 8; b++)
  16         tot += abs (w[b] - x[b]);
  17       w += i;
  18       x += j;
  19     }
  20   return tot;
  21 }
  22
  23 void
  24 bar (unsigned short *w, unsigned short *x, int i, int *result)
  25 {
  26   *result = foo (w, 8, x, i);
  27 }
  28
  29 /* { dg-final { scan-assembler-times "vabsduh" 16 } } */
  30 /* { dg-final { scan-assembler-times "vsum4shs" 16 } } */
  31 /* { dg-final { scan-assembler-times "vadduwm" 17 } } */
  32
  33 /* Note: One of the 16 adds is optimized out (add with zero),
  34    leaving 15.  The extra two adds are for the final reduction.  */