ceph/src/boost/libs/multiprecision/test/test_convert_from_float128.cpp

   1 ///////////////////////////////////////////////////////////////
   2 //  Copyright 2012 John Maddock. Distributed under the Boost
   3 //  Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_
   5
   6 #ifdef _MSC_VER
   7 #  define _SCL_SECURE_NO_WARNINGS
   8 #endif
   9
  10 #ifdef HAS_FLOAT128
  11
  12 #include <boost/multiprecision/cpp_int.hpp>
  13 #include <boost/random/mersenne_twister.hpp>
  14 #include <boost/random/uniform_int.hpp>
  15 #include "test.hpp"
  16
  17 #if defined(HAS_GMP)
  18 #include <boost/multiprecision/gmp.hpp>
  19 #endif
  20 #if defined(HAS_MPFR)
  21 #include <boost/multiprecision/mpfr.hpp>
  22 #endif
  23 #if defined(HAS_MPFI)
  24 #include <boost/multiprecision/mpfi.hpp>
  25 #endif
  26 #ifdef HAS_TOMMATH
  27 #include <boost/multiprecision/tommath.hpp>
  28 #endif
  29 #ifdef HAS_FLOAT128
  30 #include <boost/multiprecision/float128.hpp>
  31 #endif
  32 #include <boost/multiprecision/cpp_bin_float.hpp>
  33 #include <boost/multiprecision/cpp_dec_float.hpp>
  34
  35
  36 using namespace boost::multiprecision;
  37
  38 #ifdef BOOST_MSVC
  39 #pragma warning(disable:4127)
  40 #endif
  41
  42
  43 template <class T>
  44 T generate_random()
  45 {
  46    typedef int e_type;
  47    static boost::random::mt19937 gen;
  48    T val = gen();
  49    T prev_val = -1;
  50    while(val != prev_val)
  51    {
  52       val *= (gen.max)();
  53       prev_val = val;
  54       val += gen();
  55    }
  56    e_type e;
  57    val = frexp(val, &e);
  58
  59    static boost::random::uniform_int_distribution<e_type> ui(-20, 20);
  60    return ldexp(val, ui(gen));
  61 }
  62
  63 template <class From, class To>
  64 void test_convert_neg_int(From from, const boost::mpl::true_&)
  65 {
  66    from = -from;
  67    To t3(from);
  68    To t4 = from.template convert_to<To>();
  69    BOOST_CHECK_EQUAL(From(trunc(from)), From(t3));
  70    BOOST_CHECK_EQUAL(From(trunc(from)), From(t4));
  71 }
  72 template <class From, class To>
  73 void test_convert_neg_int(From const&, const boost::mpl::false_&)
  74 {
  75 }
  76
  77 template <class From, class To>
  78 void test_convert_imp(boost::mpl::int_<number_kind_floating_point> const&, boost::mpl::int_<number_kind_integer> const&)
  79 {
  80    for(unsigned i = 0; i < 100; ++i)
  81    {
  82       From from = generate_random<From>();
  83       To t1(from);
  84       To t2 = from.template convert_to<To>();
  85       BOOST_CHECK_EQUAL(From(trunc(from)), From(t1));
  86       BOOST_CHECK_EQUAL(From(trunc(from)), From(t2));
  87       test_convert_neg_int<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
  88    }
  89 }
  90
  91 template <class From, class To>
  92 void test_convert_neg_rat(From from, const boost::mpl::true_&)
  93 {
  94    from = -from;
  95    To t3(from);
  96    To t4 = from.template convert_to<To>();
  97    BOOST_CHECK_EQUAL(From(t3), from);
  98    BOOST_CHECK_EQUAL(From(t4), from);
  99 }
 100 template <class From, class To>
 101 void test_convert_rat_int(From const&, const boost::mpl::false_&)
 102 {
 103 }
 104
 105 template <class From, class To>
 106 void test_convert_imp(boost::mpl::int_<number_kind_floating_point> const&, boost::mpl::int_<number_kind_rational> const&)
 107 {
 108    for(unsigned i = 0; i < 100; ++i)
 109    {
 110       From from = generate_random<From>();
 111       To t1(from);
 112       To t2 = from.template convert_to<To>();
 113       BOOST_CHECK_EQUAL(From(t1), from);
 114       BOOST_CHECK_EQUAL(From(t2), from);
 115       test_convert_neg_rat<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
 116    }
 117 }
 118
 119 template <class From, class To>
 120 void test_convert_neg_float(From from, const boost::mpl::true_&)
 121 {
 122    from = -from;
 123    To t3(from);
 124    To t4 = from.template convert_to<To>();
 125    To answer(from.str());
 126    To tol = (std::max)(std::numeric_limits<To>::epsilon(), To(std::numeric_limits<From>::epsilon())) * 2;
 127    BOOST_CHECK_CLOSE_FRACTION(t3, answer, tol);
 128    BOOST_CHECK_CLOSE_FRACTION(t4, answer, tol);
 129 }
 130 template <class From, class To>
 131 void test_convert_neg_float(From const&, const boost::mpl::false_&)
 132 {
 133 }
 134
 135 template <class From, class To>
 136 void test_convert_imp(boost::mpl::int_<number_kind_floating_point> const&, boost::mpl::int_<number_kind_floating_point> const&)
 137 {
 138    for(unsigned i = 0; i < 100; ++i)
 139    {
 140       From from = generate_random<From>();
 141       To t1(from);
 142       To t2 = from.template convert_to<To>();
 143       To answer(from.str());
 144       To tol = (std::max)(std::numeric_limits<To>::epsilon(), To(std::numeric_limits<From>::epsilon())) * 2;
 145       BOOST_CHECK_CLOSE_FRACTION(t1, answer, tol);
 146       BOOST_CHECK_CLOSE_FRACTION(t2, answer, tol);
 147       test_convert_neg_float<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
 148    }
 149 }
 150
 151 template <class From, class To>
 152 void test_convert()
 153 {
 154    test_convert_imp<From, To>(typename number_category<From>::type(), typename number_category<To>::type());
 155 }
 156
 157
 158 int main()
 159 {
 160    test_convert<float128, cpp_int>();
 161    test_convert<float128, int128_t>();
 162    test_convert<float128, uint128_t>();
 163
 164
 165    test_convert<float128, cpp_rational>();
 166
 167    test_convert<float128, cpp_dec_float_50>();
 168
 169 #if defined(HAS_GMP)
 170    test_convert<float128, mpz_int>();
 171    test_convert<float128, mpq_rational>();
 172    test_convert<float128, mpf_float_50>();
 173 #endif
 174 #if defined(HAS_MPFR)
 175    test_convert<float128, mpfr_float_50>();
 176 #endif
 177 #if defined(HAS_MPFI)
 178    test_convert<float128, mpfi_float_50>();
 179 #endif
 180 #ifdef HAS_TOMMATH
 181    test_convert<float128, tom_int>();
 182    test_convert<float128, tom_rational>();
 183 #endif
 184    return boost::report_errors();
 185 }
 186
 187 #else
 188
 189 int main() { return 0; }
 190
 191 #endif