quakeforge/libs/util/test/test-half.c

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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include "QF/mathlib.h"
struct {
int16_t half;
float flt;
} tests [] = {
{0x3c00, 1.0f},
{0x3c01, 1.0009765625f},
{0xc000, -2.0f},
{0x7bff, 65504.0f},
{0x0400, 6.103515625e-05f},
{0x03ff, 6.0975551605224609375e-05f},
{0x0001, 5.9604644775390625e-08f},
{0x0000, 0.0f},
{0x8000, -0.0f},
#if defined(__GNUC_PREREQ)
# if __GNUC_PREREQ(3,3)
{0x7c00, __builtin_huge_val ()},
{0xfc00, -__builtin_huge_val ()},
# endif
#endif
{0x3555, 0.333251953125f},
{0x3e00, 1.5f},
{0x0000, 0.0f},
};
#define num_tests (sizeof (tests) / sizeof (tests[0]))
int
main (int argc, const char **argv)
{
size_t i;
int res = 0;
for (i = 0; i < num_tests; i++) {
float flt;
int16_t half;
flt = HalfToFloat (tests[i].half);
half = FloatToHalf (tests[i].flt);
if (flt != tests[i].flt || half != tests[i].half) {
res |= 1;
printf ("test %d failed\n", (int) i);
printf ("expect: %4x %.20g\n", tests[i].half, tests[i].flt);
printf ("got : %4x %.20g\n", half, flt);
}
}
return res;
}