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// Copyright John Maddock 2016.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// This file takes way too long to run to be part of the main regression test suite,
// but is useful in probing for errors in cpp_bin_float's rounding code.
// It cycles through every single value of type float, and rounds those numbers
// plus some closely related ones and compares the results to those produced by MPFR.
//
#ifdef _MSC_VER
# define _SCL_SECURE_NO_WARNINGS
#endif
#include <boost/multiprecision/cpp_bin_float.hpp>
#include <boost/multiprecision/mpfr.hpp>
#include <boost/math/special_functions/next.hpp>
#include "test.hpp"
using namespace boost::multiprecision;
typedef number<mpfr_float_backend<35> > good_type;
typedef number<cpp_bin_float<std::numeric_limits<good_type>::digits, digit_base_2>, et_off> test_type;
int main()
{
float f = std::numeric_limits<float>::max();
do
{
float fr1, fr2;
good_type gf(f), gf2(f);
test_type tf(f), tf2(f);
fr1 = gf.convert_to<float>();
fr2 = tf.convert_to<float>();
BOOST_CHECK_EQUAL(fr1, fr2);
// next represenation:
gf = boost::math::float_next(gf2);
tf = boost::math::float_next(tf2);
BOOST_CHECK_NE(gf, gf2);
BOOST_CHECK_NE(tf, tf2);
fr1 = gf.convert_to<float>();
fr2 = tf.convert_to<float>();
BOOST_CHECK_EQUAL(fr1, fr2);
// previous representation:
gf = boost::math::float_prior(gf2);
tf = boost::math::float_prior(tf2);
BOOST_CHECK_NE(gf, gf2);
BOOST_CHECK_NE(tf, tf2);
fr1 = gf.convert_to<float>();
fr2 = tf.convert_to<float>();
BOOST_CHECK_EQUAL(fr1, fr2);
// Create ands test ties:
int e;
std::frexp(f, &e);
float extra = std::ldexp(1.0f, e - std::numeric_limits<float>::digits - 1);
gf = gf2 += extra;
tf = tf2 += extra;
fr1 = gf.convert_to<float>();
fr2 = tf.convert_to<float>();
BOOST_CHECK_EQUAL(fr1, fr2);
// next represenation:
gf = boost::math::float_next(gf2);
tf = boost::math::float_next(tf2);
BOOST_CHECK_NE(gf, gf2);
BOOST_CHECK_NE(tf, tf2);
fr1 = gf.convert_to<float>();
fr2 = tf.convert_to<float>();
BOOST_CHECK_EQUAL(fr1, fr2);
// previous representation:
gf = boost::math::float_prior(gf2);
tf = boost::math::float_prior(tf2);
BOOST_CHECK_NE(gf, gf2);
BOOST_CHECK_NE(tf, tf2);
fr1 = gf.convert_to<float>();
fr2 = tf.convert_to<float>();
BOOST_CHECK_EQUAL(fr1, fr2);
f = boost::math::float_prior(f);
} while(f);
return boost::report_errors();
}
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