ssse3-phsubsw.c

来自「用于进行gcc测试」· C语言 代码 · 共 86 行

/* { dg-do run } */
/* { dg-require-effective-target ssse3 } */
/* { dg-options "-O2 -fno-strict-aliasing -mssse3" } */

#include "ssse3-check.h"
#include "ssse3-vals.h"

#include <tmmintrin.h>

/* Test the 64-bit form */
static void
ssse3_test_phsubsw (int *i1, int *i2, int *r)
{
  __m64 t1 = *(__m64 *) i1;
  __m64 t2 = *(__m64 *) i2;

  *(__m64 *) r = _mm_hsubs_pi16 (t1, t2);

  _mm_empty ();
}

/* Test the 128-bit form */
static void
ssse3_test_phsubsw128 (int *i1, int *i2, int *r)
{
  /* Assumes incoming pointers are 16-byte aligned */
  __m128i t1 = *(__m128i *) i1;
  __m128i t2 = *(__m128i *) i2;
  *(__m128i *) r = _mm_hsubs_epi16 (t1, t2);
}

static short
signed_saturate_to_word (int x)
{
  if (x > (int )0x7fff)
    return 0x7fff;

  if (x < (int) 0xffff8000)
    return 0x8000;

  return (short)x;
}

/* Routine to manually compute the results */
static void
compute_correct_result (int *i1, int *i2, int *r)
{
  short *s1 = (short *) i1;
  short *s2 = (short *) i2;
  short *sout = (short *) r;
  int i;

  for (i = 0; i < 4; i++)
    sout[i] = signed_saturate_to_word (s1[2 * i] - s1[2 * i + 1]);

  for (i = 0; i < 4; i++)
    sout[i + 4] = signed_saturate_to_word (s2[2 * i] - s2[2 * i + 1]);
}

static void
ssse3_test (void)
{
  int i;
  int r [4] __attribute__ ((aligned(16)));
  int ck [4];
  int fail = 0;

  for (i = 0; i < 256; i += 8)
    {
      /* Manually compute the result */
      compute_correct_result (&vals[i + 0], &vals[i + 4], ck);

      /* Run the 64-bit tests */
      ssse3_test_phsubsw (&vals[i + 0], &vals[i + 2], &r[0]);
      ssse3_test_phsubsw (&vals[i + 4], &vals[i + 6], &r[2]);
      fail += chk_128 (ck, r);

      /* Run the 128-bit tests */
      ssse3_test_phsubsw128 (&vals[i + 0], &vals[i + 4], r);
      fail += chk_128 (ck, r);
    }

  if (fail != 0)
    abort ();
}