1  /* Disabling epilogues until we find a better way to deal with scans.  */
       2  /* { dg-additional-options "--param vect-epilogues-nomask=0" } */
       3  /* { dg-require-effective-target vect_usad_char } */
       4  
       5  #include <stdarg.h>
       6  #include "tree-vect.h"
       7  
       8  #define N 64
       9  #define SAD N*N/2
      10  
      11  unsigned char X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
      12  unsigned char Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
      13  int abs (int);
      14  
      15  /* Sum of absolute differences between arrays of unsigned char types.
      16     Detected as a sad pattern.
      17     Vectorized on targets that support sad for unsigned chars.  */
      18  
      19  __attribute__ ((noinline)) int
      20  foo (int len)
      21  {
      22    int i;
      23    int result = 0;
      24  
      25    for (i = 0; i < len; i++)
      26      result += abs (X[i] - Y[i]);
      27  
      28    return result;
      29  }
      30  
      31  
      32  int
      33  main (void)
      34  {
      35    int i;
      36    int sad;
      37  
      38    check_vect ();
      39  
      40    for (i = 0; i < N; i++)
      41      {
      42        X[i] = i;
      43        Y[i] = N - i;
      44        __asm__ volatile ("");
      45      }
      46  
      47    sad = foo (N);
      48    if (sad != SAD)
      49      abort ();
      50  
      51    return 0;
      52  }
      53  
      54  /* { dg-final { scan-tree-dump-times "sad pattern recognized" 1 "vect" } } */
      55  /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */
      56