gcc/testsuite/gcc.target/i386/sse4_1-roundss-4.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target sse4 } */
   3 /* { dg-options "-O2 -msse4.1" } */
   4 /* { dg-skip-if "no M_PI" { vxworks_kernel } } */
   5
   6 #include "sse4_1-check.h"
   7
   8 #include <smmintrin.h>
   9 #include <math.h>
  10 #include <string.h>
  11
  12 #define NUM 64
  13
  14 static void
  15 init_round (float *src)
  16 {
  17   int i, sign = 1;
  18   float f = rand ();
  19
  20   for (i = 0; i < NUM; i++)
  21     {
  22       src[i] = (i + 1)* f * M_PI * sign;
  23       if (i < (NUM / 2))
  24         {
  25           if ((i % 6) == 0)
  26             f = f * src[i];
  27         }
  28       else if (i == (NUM / 2))
  29         f = rand ();
  30       else if ((i % 6) == 0)
  31         f = 1 / (f * (i + 1) * src[i] * M_PI *sign);
  32       sign = -sign;
  33     }
  34 }
  35
  36 static float
  37 do_round (float f, int type)
  38 {
  39   short saved_cw, new_cw, clr_mask;
  40   float ret;
  41
  42   if ((type & 4))
  43     {
  44       type = 0;
  45       clr_mask = 0xFFFF;
  46     }
  47   else
  48     {
  49       type = 0x003F | ((type & 3) << 10);
  50       clr_mask = ~0x0C3F;
  51     }
  52
  53   __asm__ ("flds %0" : : "m" (*&f));
  54
  55   __asm__ ("fstcw %0" : "=m" (*&saved_cw));
  56   new_cw = saved_cw & clr_mask;
  57   new_cw |= type;
  58   __asm__ ("fldcw %0" : : "m" (*&new_cw));
  59
  60   __asm__ ("frndint\n"
  61            "fstps %0\n" : "=m" (*&ret));
  62   __asm__ ("fldcw %0" : : "m" (*&saved_cw));
  63   return ret;
  64 }
  65
  66 static void
  67 sse4_1_test (void)
  68 {
  69   int i, j;
  70   float f;
  71   union
  72     {
  73       __m128 x[NUM / 4];
  74       float f[NUM];
  75     } dst, src;
  76
  77   init_round (src.f);
  78   memset (&dst, 0, NUM * sizeof(float));
  79
  80   for (i = 0; i < NUM / 4 ; i++)
  81     dst.x[i] =  _mm_round_ss (dst.x[i], src.x[i], _MM_FROUND_RINT);
  82
  83   for (i = 0; i < NUM; i += 4)
  84     {
  85       for (j = 0; j < 3; j++)
  86         if (dst.f[i + j + 1] != 0.0)
  87           abort ();
  88
  89       f = do_round (src.f[i], 0x04);
  90       if (f != dst.f[i])
  91         abort ();
  92     }
  93
  94   for (i = 0; i < NUM / 4 ; i++)
  95     dst.x[i] =  _mm_round_ss (dst.x[i], src.x[i], _MM_FROUND_NEARBYINT);
  96
  97   for (i = 0; i < NUM; i += 4)
  98     {
  99       for (j = 0; j < 3; j++)
 100         if (dst.f[i + j + 1] != 0.0)
 101           abort ();
 102
 103       f = do_round (src.f[i], 0x0c);
 104       if (f != dst.f[i])
 105         abort ();
 106     }
 107 }