libcruft-util/test/float.cpp

76 lines
2.0 KiB
C++

#include "../float.hpp"
#include "../debug.hpp"
#include <limits>
using namespace std;
#define elems(x) (sizeof(x) / sizeof(0[x]))
void
test_double (void) {
struct sized_test {
ieee_double::uint_t bits;
double floating;
};
sized_test tests[] = {
{ 0x3ff0000000000000, 1.0 },
{ 0x3ff0000000000001, 1.0 + numeric_limits<double>::epsilon () },
{ 0x3ff0000000000002, 1.0 + numeric_limits<double>::epsilon () * 2},
{ 0x4000000000000000, 2.0 },
{ 0xc000000000000000, -2.0 },
{ 0x0000000000000001, numeric_limits<double>::denorm_min () },
{ 0x0010000000000000, numeric_limits<double>::min () }, // min positive normal
{ 0x7fefffffffffffff, numeric_limits<double>::max () }, // max
{ 0x0000000000000000, 0.0 },
{ 0x8000000000000000, -0.0 },
{ 0x7ff0000000000000, numeric_limits<double>::infinity() },
{ 0xfff0000000000000, -numeric_limits<double>::infinity() },
{ 0x3fd5555555555555, 1.0 / 3.0 }
};
for (unsigned int i = 0; i < elems (tests); ++i) {
ieee_double val;
val.set_bits (tests[i].bits);
check_hard (val == tests[i].floating);
}
}
void
test_single (void) {
struct sized_test {
ieee_single::uint_t bits;
float floating;
};
sized_test tests[] = {
{ 0x3f800000, 1.0f },
{ 0xc0000000, -2.0f },
{ 0x7f7fffff, numeric_limits<float>::max () },
{ 0x00000000, 0.0f },
{ 0x80000000, -0.0f },
{ 0x7f800000, numeric_limits<float>::infinity () },
{ 0xff800000, -numeric_limits<float>::infinity () },
{ 0x3eaaaaab, 1.0f / 3.0f }
};
for (unsigned int i = 0; i < elems (tests); ++i) {
ieee_single val;
val.set_bits (tests[i].bits);
check_hard (val == tests[i].floating);
}
}
int
main (int, char **) {
test_single ();
test_double ();
}