gcc/testsuite/gcc.target/i386/avx2-vphsubsw-2.c

   1 /* { dg-do run } */
   2 /* { dg-options "-mavx2 -O2" } */
   3 /* { dg-require-effective-target avx2 } */
   4
   5 #include "avx2-check.h"
   6 #include "ssse3-vals.h"
   7
   8 static short
   9 signed_saturate_to_word (int x)
  10 {
  11   if (x > (int) 0x7fff)
  12     return 0x7fff;
  13
  14   if (x < (int) 0xffff8000)
  15     return 0x8000;
  16
  17   return (short) x;
  18 }
  19
  20 static void
  21 compute_phsubsw256 (short *i1, short *i2, short *r)
  22 {
  23   int i;
  24
  25   for (i = 0; i < 4; i++)
  26     r[i + 0] = signed_saturate_to_word (i1[2 * i] - i1[2 * i + 1]);
  27
  28   for (i = 0; i < 4; i++)
  29     r[i + 4] = signed_saturate_to_word (i2[2 * i] - i2[2 * i + 1]);
  30
  31   for (i = 0; i < 4; i++)
  32     r[i + 8] = signed_saturate_to_word (i1[2 * i + 8] - i1[2 * i + 9]);
  33
  34   for (i = 0; i < 4; i++)
  35     r[i + 12] = signed_saturate_to_word (i2[2 * i + 8] - i2[2 * i + 9]);
  36 }
  37
  38 static void
  39 avx2_test (void)
  40 {
  41   union256i_w s1, s2, res;
  42   short res_ref[16];
  43   int i;
  44   int fail = 0;
  45
  46   for (i = 0; i < 256; i += 16)
  47     {
  48       s1.x = _mm256_loadu_si256 ((__m256i *) & vals[i]);
  49       s2.x = _mm256_loadu_si256 ((__m256i *) & vals[i + 8]);
  50
  51       res.x = _mm256_hsubs_epi16 (s1.x, s2.x);
  52
  53       compute_phsubsw256 (s1.a, s2.a, res_ref);
  54
  55       fail += check_union256i_w (res, res_ref);
  56     }
  57
  58   if (fail != 0)
  59     abort ();
  60 }