CAN-binder/libs/nanopb/examples/using_double_on_avr/test_conversions.c

   1 #include "double_conversion.h"
   2 #include <math.h>
   3 #include <stdio.h>
   4
   5 static const double testvalues[] = {
   6            0.0,        -0.0,         0.1,         -0.1,
   7           M_PI,       -M_PI,  123456.789,  -123456.789,
   8       INFINITY,   -INFINITY,         NAN, INFINITY - INFINITY,
   9           1e38,       -1e38,        1e39,        -1e39,
  10          1e-38,      -1e-38,       1e-39,       -1e-39,
  11    3.14159e-37,-3.14159e-37, 3.14159e-43, -3.14159e-43,
  12          1e-60,      -1e-60,       1e-45,       -1e-45,
  13     0.99999999999999, -0.99999999999999, 127.999999999999, -127.999999999999
  14 };
  15
  16 #define TESTVALUES_COUNT (sizeof(testvalues)/sizeof(testvalues[0]))
  17
  18 int main()
  19 {
  20     int status = 0;
  21     int i;
  22     for (i = 0; i < TESTVALUES_COUNT; i++)
  23     {
  24         double orig = testvalues[i];
  25         float expected_float = (float)orig;
  26         double expected_double = (double)expected_float;
  27
  28         float got_float = double_to_float(*(uint64_t*)&orig);
  29         uint64_t got_double = float_to_double(got_float);
  30
  31         uint32_t e1 = *(uint32_t*)&expected_float;
  32         uint32_t g1 = *(uint32_t*)&got_float;
  33         uint64_t e2 = *(uint64_t*)&expected_double;
  34         uint64_t g2 = got_double;
  35
  36         if (g1 != e1)
  37         {
  38             printf("%3d double_to_float fail: %08x != %08x\n", i, g1, e1);
  39             status = 1;
  40         }
  41
  42         if (g2 != e2)
  43         {
  44             printf("%3d float_to_double fail: %016llx != %016llx\n", i,
  45                 (unsigned long long)g2,
  46                 (unsigned long long)e2);
  47             status = 1;
  48         }
  49     }
  50
  51     return status;
  52 }
  53
  54
  55
  56