gcc/testsuite/gcc.target/i386/ssse3-phsubsw.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target ssse3 } */
   3 /* { dg-options "-O2 -fno-strict-aliasing -mssse3" } */
   4
   5 #ifndef CHECK_H
   6 #define CHECK_H "ssse3-check.h"
   7 #endif
   8
   9 #ifndef TEST
  10 #define TEST ssse3_test
  11 #endif
  12
  13 #include CHECK_H
  14
  15 #include "ssse3-vals.h"
  16
  17 #include <tmmintrin.h>
  18
  19 #ifndef __AVX__
  20 /* Test the 64-bit form */
  21 static void
  22 ssse3_test_phsubsw (int *i1, int *i2, int *r)
  23 {
  24   __m64 t1 = *(__m64 *) i1;
  25   __m64 t2 = *(__m64 *) i2;
  26
  27   *(__m64 *) r = _mm_hsubs_pi16 (t1, t2);
  28
  29   _mm_empty ();
  30 }
  31 #endif
  32
  33 /* Test the 128-bit form */
  34 static void
  35 ssse3_test_phsubsw128 (int *i1, int *i2, int *r)
  36 {
  37   /* Assumes incoming pointers are 16-byte aligned */
  38   __m128i t1 = *(__m128i *) i1;
  39   __m128i t2 = *(__m128i *) i2;
  40   *(__m128i *) r = _mm_hsubs_epi16 (t1, t2);
  41 }
  42
  43 static short
  44 signed_saturate_to_word (int x)
  45 {
  46   if (x > (int )0x7fff)
  47     return 0x7fff;
  48
  49   if (x < (int) 0xffff8000)
  50     return 0x8000;
  51
  52   return (short)x;
  53 }
  54
  55 /* Routine to manually compute the results */
  56 static void
  57 compute_correct_result (int *i1, int *i2, int *r)
  58 {
  59   short *s1 = (short *) i1;
  60   short *s2 = (short *) i2;
  61   short *sout = (short *) r;
  62   int i;
  63
  64   for (i = 0; i < 4; i++)
  65     sout[i] = signed_saturate_to_word (s1[2 * i] - s1[2 * i + 1]);
  66
  67   for (i = 0; i < 4; i++)
  68     sout[i + 4] = signed_saturate_to_word (s2[2 * i] - s2[2 * i + 1]);
  69 }
  70
  71 static void
  72 TEST (void)
  73 {
  74   int i;
  75   int r [4] __attribute__ ((aligned(16)));
  76   int ck [4];
  77   int fail = 0;
  78
  79   for (i = 0; i < 256; i += 8)
  80     {
  81       /* Manually compute the result */
  82       compute_correct_result (&vals[i + 0], &vals[i + 4], ck);
  83
  84 #ifndef __AVX__
  85       /* Run the 64-bit tests */
  86       ssse3_test_phsubsw (&vals[i + 0], &vals[i + 2], &r[0]);
  87       ssse3_test_phsubsw (&vals[i + 4], &vals[i + 6], &r[2]);
  88       fail += chk_128 (ck, r);
  89 #endif
  90
  91       /* Run the 128-bit tests */
  92       ssse3_test_phsubsw128 (&vals[i + 0], &vals[i + 4], r);
  93       fail += chk_128 (ck, r);
  94     }
  95
  96   if (fail != 0)
  97     abort ();
  98 }