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Add test for leading zero count

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This commit is contained in:
Matt Borland
2023-02-20 14:44:27 -08:00
parent 2f2929eabc
commit 861bcf7f62
2 changed files with 46 additions and 0 deletions
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test/leading_zero_count.cpp Normal file
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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/charconv/detail/leading_zeros.hpp>
#include <boost/core/lightweight_test.hpp>
#include <limits>
#include <cstdint>
template <typename T>
void test()
{
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(1), 63);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(2), 62);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(3), 62);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(4), 61);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(8), 60);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(16), 59);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(32), 58);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(64), 57);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(128), 56);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(200), 56);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(256), 55);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(500), 55);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(512), 54);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(1000), 54);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(1024), 53);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() - 1), 0);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max()), 0);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 2 + 1), 0);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 2), 1);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 4 + 1), 1);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 4), 2);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 8), 3);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 16), 4);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 32), 5);
BOOST_TEST_EQ(boost::charconv::detail::leading_zeros(std::numeric_limits<T>::max() / 64), 6);
}
int main(void)
{
test<std::uint64_t>();
return boost::report_errors();
}