text: /* { dg-do run } */
  /* { dg-require-effective-target avx2 } */
  /* { dg-options "-O2 -mavx2" } */
  
  #include <string.h>
  #include "avx2-check.h"
  
  static void
  compute_i64gatherq256 (long long *src,
  		       long long *s1,
  		       long long *s2,
  		       long long *mask, int scale, long long *r)
  {
    long long i;
  
    for (i = 0; i < 4; ++i)
      if ((mask[i] >> 63) & 1)
        r[i] = *(long long *) (((unsigned char *) s1) + s2[i] * scale);
      else
        r[i] = src[i];
  }
  
  void static
  avx2_test (void)
  {
    long long i;
    union256i_q idx;
    union256i_q res, src, mask;
    long long s1[4], res_ref[4] = { 0 };
  
    for (i = 0; i < 4; ++i)
      {
        /* Set some stuff */
        s1[i] = 1983 * (i + 1) * (i + 2);
  
        /* Set src as something different from s1 */
        src.a[i] = -s1[i];
  
        /* Mask out evens */
        ((long long *) mask.a)[i] = i % 2 ? 0 : -1;
  
        /* About to gather in reverse order,
           divide by 2 to demonstrate scale */
        idx.a[i] = (16 - (i + 1) * 8) >> 1;
      }
  
    res.x = _mm256_mask_i64gather_epi64 (src.x,
  				       (long long int *) s1,
  				       idx.x, mask.x, 2);
  
    compute_i64gatherq256 (src.a, s1, idx.a, mask.a, 2, res_ref);
  
    if (check_union256i_q (res, res_ref) != 0)
      abort ();
  }
  