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/* { dg-do run } */

/* { dg-options "-mavx2 -O2" } */

/* { dg-require-effective-target avx2 } */

#include "avx2-check.h"

#include "ssse3-vals.h"

static short

signed_saturate_to_word (int x)

{

  if (x > (int) 0x7fff)

    return 0x7fff;

  if (x < (int) 0xffff8000)

    return 0x8000;

  return (short) x;

}

static void

compute_phsubsw256 (short *i1, short *i2, short *r)

{

  int i;

  for (i = 0; i < 4; i++)

    r[i + 0] = signed_saturate_to_word (i1[2 * i] - i1[2 * i + 1]);

  for (i = 0; i < 4; i++)

    r[i + 4] = signed_saturate_to_word (i2[2 * i] - i2[2 * i + 1]);

  for (i = 0; i < 4; i++)

    r[i + 8] = signed_saturate_to_word (i1[2 * i + 8] - i1[2 * i + 9]);

  for (i = 0; i < 4; i++)

    r[i + 12] = signed_saturate_to_word (i2[2 * i + 8] - i2[2 * i + 9]);

}

static void

avx2_test (void)

{

  union256i_w s1, s2, res;

  short res_ref[16];

  int i;

  int fail = 0;

  for (i = 0; i < 256; i += 16)

    {

      s1.x = _mm256_loadu_si256 ((__m256i *) & vals[i]);

      s2.x = _mm256_loadu_si256 ((__m256i *) & vals[i + 8]);

      res.x = _mm256_hsubs_epi16 (s1.x, s2.x);

      compute_phsubsw256 (s1.a, s2.a, res_ref);

      fail += check_union256i_w (res, res_ref);

    }

  if (fail != 0)

    abort ();

}