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// Copyright 2023 Matt Borland
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/config.hpp>
#ifdef BOOST_HAS_INT128
// We need to define these operator<< overloads before
// including boost/core/lightweight_test.hpp, or they
// won't be visible to BOOST_TEST_EQ
// LCOV_EXCL_START
#include <ostream>
static char* mini_to_chars( char (&buffer)[ 64 ], boost::uint128_type v )
{
char* p = buffer + 64;
*--p = '\0';
do
{
*--p = "0123456789"[ v % 10 ];
v /= 10;
}
while ( v != 0 );
return p;
}
std::ostream& operator<<( std::ostream& os, boost::uint128_type v )
{
char buffer[ 64 ];
os << mini_to_chars( buffer, v );
return os;
}
std::ostream& operator<<( std::ostream& os, boost::int128_type v )
{
char buffer[ 64 ];
char* p;
if( v >= 0 )
{
p = mini_to_chars( buffer, static_cast<boost::uint128_type>(v) );
}
else
{
p = mini_to_chars( buffer, -static_cast<boost::uint128_type>(v) );
*--p = '-';
}
os << p;
return os;
}
// LCOV_EXCL_STOP
#endif // #ifdef BOOST_HAS_INT128
#include <boost/charconv/detail/emulated128.hpp>
#include <boost/core/lightweight_test.hpp>
#include <limits>
#include <iostream>
#include <climits>
#include <cstdint>
using boost::charconv::detail::uint128;
using boost::charconv::detail::trivial_uint128;
template <typename T>
void test_relational_operators(T val = (std::numeric_limits<T>::max)())
{
uint128 test_val = UINT64_MAX;
test_val += 1;
BOOST_TEST(test_val > val);
BOOST_TEST(!(test_val < val));
BOOST_TEST(!(test_val == val));
BOOST_TEST(test_val != val);
const uint128 equal_val = val;
BOOST_TEST(!(equal_val > val));
BOOST_TEST(equal_val >= val);
BOOST_TEST(!(equal_val < val));
BOOST_TEST(equal_val <= val);
BOOST_TEST(equal_val == val);
BOOST_TEST(!(equal_val != val));
int negative_val = -100;
BOOST_TEST(test_val > negative_val);
BOOST_TEST(!(test_val < negative_val));
BOOST_TEST(!(test_val == negative_val));
BOOST_TEST(test_val != negative_val);
}
void test_arithmetic_operators()
{
// Only using low word
const auto fixed_val = UINT64_MAX / 2;
uint128 test_val = fixed_val;
BOOST_TEST(test_val / 2 == UINT64_MAX / 4);
BOOST_TEST(test_val + 1 == fixed_val + 1);
test_val++;
BOOST_TEST(test_val == fixed_val + 1);
BOOST_TEST(test_val % fixed_val == 1);
test_val--;
BOOST_TEST(test_val == fixed_val);
BOOST_TEST(test_val % fixed_val == 0);
BOOST_TEST(test_val / fixed_val == 1);
test_val = 2;
std::uint64_t comp_val = 1;
while (test_val < UINT64_MAX)
{
comp_val *= 2;
if(!BOOST_TEST(test_val == comp_val))
{
// LCOV_EXCL_START
std::cerr << "Target: " << comp_val
<< "\ntest_val: " << test_val.low << std::endl;
// LCOV_EXCL_STOP
}
test_val *= 2;
}
// And back down
while (test_val >= 2)
{
test_val /= 2;
if(!BOOST_TEST(test_val == comp_val))
{
// LCOV_EXCL_START
std::cerr << "Target: " << comp_val
<< "\ntest_val: " << test_val.low << std::endl;
// LCOV_EXCL_STOP
}
comp_val /= 2;
}
// Add the high word
uint128 test_high_word = UINT64_MAX;
++test_high_word;
BOOST_TEST(test_high_word.high == 1 && test_high_word.low == 0);
--test_high_word;
#ifdef BOOST_CHARCONV_HAS_INT128
boost::uint128_type reference = UINT64_MAX;
BOOST_TEST(test_high_word == reference);
for (int i = 0; i < 63; ++i)
{
if(!BOOST_TEST(test_high_word == reference))
{
// LCOV_EXCL_START
std::cerr << "i: " << i
<< "\nTarget: " << reference
<< "\ntest_val: " << test_high_word.high << " " << test_high_word.low << std::endl;
// // LCOV_EXCL_STOP
}
test_high_word *= 2;
reference *= 2;
}
while (test_high_word >= 2)
{
BOOST_TEST(test_high_word == reference);
test_high_word /= 2;
reference /= 2;
}
#endif
}
void test_bitwise_operators()
{
#ifdef BOOST_CHARCONV_HAS_INT128
boost::uint128_type ref = UINT64_MAX;
uint128 test_val = UINT64_MAX;
ref <<= 1;
test_val <<= 1;
BOOST_TEST(test_val == ref);
ref >>= 2;
test_val >>= 2;
BOOST_TEST(test_val == ref);
BOOST_TEST((test_val | 1) == (ref | 1));
BOOST_TEST((test_val & 1) == (ref & 1));
BOOST_TEST(~test_val == ~ref);
#endif
}
void test_memcpy()
{
#if defined(BOOST_CHARCONV_HAS_QUADMATH) && defined(BOOST_CHARCONV_HAS_INT128)
__float128 fval = 1e4000Q;
boost::uint128_type ref;
trivial_uint128 cpyval;
std::memcpy(&cpyval, &fval, sizeof(fval));
std::memcpy(&ref, &fval, sizeof(fval));
uint128 test_val = cpyval;
BOOST_TEST(test_val == ref);
#endif
}
void test_limits()
{
BOOST_TEST((std::numeric_limits<uint128>::min)() == 0);
BOOST_TEST((std::numeric_limits<uint128>::max)() == uint128(UINT64_MAX, UINT64_MAX));
BOOST_TEST(std::numeric_limits<uint128>::is_signed == false);
BOOST_TEST(std::numeric_limits<uint128>::is_integer == true);
BOOST_TEST(std::numeric_limits<uint128>::digits == CHAR_BIT * sizeof(std::uint64_t) * 2);
// Max value is 340,282,366,920,938,463,463,374,607,431,768,211,455 (39 digits) so 38 without change
BOOST_TEST(std::numeric_limits<uint128>::digits10 == 38);
}
int main()
{
test_relational_operators<char>();
test_relational_operators<signed char>();
test_relational_operators<short>();
test_relational_operators<int>();
test_relational_operators<long>();
test_relational_operators<long long>();
test_relational_operators<unsigned char>();
test_relational_operators<unsigned short>();
test_relational_operators<unsigned>();
test_relational_operators<unsigned long>();
test_relational_operators<unsigned long long>();
test_arithmetic_operators();
test_bitwise_operators();
test_memcpy();
test_limits();
return boost::report_errors();
}
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