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example009b_timed_mul_8_by_8.cpp
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example009b_timed_mul_8_by_8.cpp
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///////////////////////////////////////////////////////////////////
// Copyright Christopher Kormanyos 2018 - 2024. //
// Distributed under 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) //
///////////////////////////////////////////////////////////////////
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <iomanip>
#include <iostream>
#include <limits>
#include <random>
#include <vector>
#include <examples/example_uintwide_t.h>
#include <math/wide_integer/uintwide_t.h>
#include <util/utility/util_pseudorandom_time_point_seed.h>
namespace local_timed_mul_8_by_8
{
template<typename UnsignedIntegralIteratorType,
typename RandomEngineType>
auto get_random_big_uint(RandomEngineType& rng, UnsignedIntegralIteratorType it_out) -> void
{
using local_uint_type = typename std::iterator_traits<UnsignedIntegralIteratorType>::value_type;
#if defined(WIDE_INTEGER_NAMESPACE)
using distribution_type =
WIDE_INTEGER_NAMESPACE::math::wide_integer::uniform_int_distribution<std::numeric_limits<local_uint_type>::digits, typename local_uint_type::limb_type>;
#else
using distribution_type =
::math::wide_integer::uniform_int_distribution<std::numeric_limits<local_uint_type>::digits, typename local_uint_type::limb_type>;
#endif
distribution_type distribution;
*it_out = distribution(rng);
}
#if defined(WIDE_INTEGER_NAMESPACE)
using big_uint_type = WIDE_INTEGER_NAMESPACE::math::wide_integer::uintwide_t<static_cast<WIDE_INTEGER_NAMESPACE::math::wide_integer::size_t>(UINT32_C(256))>;
#else
using big_uint_type = ::math::wide_integer::uintwide_t<static_cast<math::wide_integer::size_t>(UINT32_C(256))>;
#endif
auto local_a() -> std::vector<big_uint_type>&
{
static std::vector<big_uint_type>
my_local_a
(
static_cast<typename std::vector<big_uint_type>::size_type>(UINT32_C(1024))
);
return my_local_a;
}
auto local_b() -> std::vector<big_uint_type>&
{
static std::vector<big_uint_type> my_local_b(local_a().size());
return my_local_b;
}
} // namespace local_timed_mul_8_by_8
#if defined(WIDE_INTEGER_NAMESPACE)
auto WIDE_INTEGER_NAMESPACE::math::wide_integer::example009b_timed_mul_8_by_8() -> bool
#else
auto ::math::wide_integer::example009b_timed_mul_8_by_8() -> bool
#endif
{
using random_engine_type =
std::linear_congruential_engine<std::uint32_t, UINT32_C(48271), UINT32_C(0), UINT32_C(2147483647)>;
random_engine_type rng; // NOLINT(cert-msc32-c,cert-msc51-cpp)
rng.seed(::util::util_pseudorandom_time_point_seed::value<typename random_engine_type::result_type>());
for(auto i = static_cast<typename std::vector<local_timed_mul_8_by_8::big_uint_type>::size_type>(0U); i < local_timed_mul_8_by_8::local_a().size(); ++i)
{
local_timed_mul_8_by_8::get_random_big_uint(rng, local_timed_mul_8_by_8::local_a().begin() + static_cast<typename std::vector<local_timed_mul_8_by_8::big_uint_type>::difference_type>(i));
local_timed_mul_8_by_8::get_random_big_uint(rng, local_timed_mul_8_by_8::local_b().begin() + static_cast<typename std::vector<local_timed_mul_8_by_8::big_uint_type>::difference_type>(i));
}
std::uint64_t count = 0U;
std::size_t index = 0U;
float total_time { };
const auto begin = std::clock();
for(;;)
{
local_timed_mul_8_by_8::local_a().at(index + 0U) * local_timed_mul_8_by_8::local_b().at(index + 0U);
local_timed_mul_8_by_8::local_a().at(index + 1U) * local_timed_mul_8_by_8::local_b().at(index + 1U);
local_timed_mul_8_by_8::local_a().at(index + 2U) * local_timed_mul_8_by_8::local_b().at(index + 2U);
local_timed_mul_8_by_8::local_a().at(index + 3U) * local_timed_mul_8_by_8::local_b().at(index + 3U);
const auto end = std::clock();
total_time = static_cast<float>(static_cast<float>(end - begin) / CLOCKS_PER_SEC);
count += 4U;
index += 4U;
if(index >= local_timed_mul_8_by_8::local_a().size())
{
index = 0U;
}
if(total_time > static_cast<float>(6.0L)) // NOLINT(cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers)
{
break;
}
}
const float kops_per_sec = static_cast<float>(count) / static_cast<float>(static_cast<float>(total_time * 1000.0F));
{
const auto flg = std::cout.flags();
std::cout << "bits: "
<< std::numeric_limits<local_timed_mul_8_by_8::big_uint_type>::digits
<< ", kops_per_sec: "
<< std::fixed
<< std::setprecision(2)
<< kops_per_sec
<< ", count: "
<< count
<< std::endl;
std::cout.flags(flg);
}
const auto result_is_ok = (kops_per_sec > (std::numeric_limits<float>::min)());
return result_is_ok;
}
// Enable this if you would like to activate this main() as a standalone example.
#if defined(WIDE_INTEGER_STANDALONE_EXAMPLE009B_TIMED_MUL_8_BY_8)
auto main() -> int
{
#if defined(WIDE_INTEGER_NAMESPACE)
const auto result_is_ok = WIDE_INTEGER_NAMESPACE::math::wide_integer::example009b_timed_mul_8_by_8();
#else
const auto result_is_ok = ::math::wide_integer::example009b_timed_mul_8_by_8();
#endif
std::cout << "result_is_ok: " << std::boolalpha << result_is_ok << std::endl;
return (result_is_ok ? 0 : -1);
}
#endif