src/gallium/tests/unit/u_half_test.c

#include <stdlib.h>
#include <stdio.h>
#include <float.h>

#include "util/u_math.h"
#include "util/u_half.h"

int
main(int argc, char **argv)
{
   unsigned i;
   unsigned roundtrip_fails = 0;

   for(i = 0; i < 1 << 16; ++i)
   {
      uint16_t h = (uint16_t) i;
      union fi f;
      uint16_t rh;

      f.f = util_half_to_float(h);
      rh = util_float_to_half(f.f);

      if (h != rh && !(util_is_half_nan(h) && util_is_half_nan(rh))) {
         printf("Roundtrip failed: %x -> %x = %f -> %x\n", h, f.ui, f.f, rh);
         ++roundtrip_fails;
      }
   }

   if(roundtrip_fails)
      printf("Failure! %u/65536 half floats failed a conversion to float and back.\n", roundtrip_fails);
   else
      printf("Success!\n");

   return 0;
}