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///
/// @file fast_div.cpp
/// @brief Test fast_div(x, y) function
///
/// Copyright (C) 2020 Kim Walisch, <kim.walisch@gmail.com>
///
/// This file is distributed under the BSD License. See the COPYING
/// file in the top level directory.
///
#include <fast_div.hpp>
#include <int128_t.hpp>
#include <stdint.h>
#include <cstdlib>
#include <iostream>
#include <limits>
#include <random>
#include <type_traits>
using namespace primecount;
static_assert(std::is_same<make_smaller<int32_t>::type, uint32_t>::value,
"make_smaller<int32_t>::type != uint32_t");
#if defined(ENABLE_DIV32)
static_assert(std::is_same<make_smaller<uint64_t>::type, uint32_t>::value,
"make_smaller<uint64_t>::type != uint32_t");
#else
static_assert(std::is_same<make_smaller<uint64_t>::type, uint64_t>::value,
"make_smaller<uint64_t>::type != uint64_t");
#endif
#ifdef HAVE_INT128_T
static_assert(std::is_same<make_smaller<int128_t>::type, uint64_t>::value,
"make_smaller<int128_t>::type != uint64_t");
#endif
void check(bool OK)
{
std::cout << " " << (OK ? "OK" : "ERROR") << "\n";
if (!OK)
std::exit(1);
}
int main()
{
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<int32_t> dist_i32(1, std::numeric_limits<int32_t>::max());
std::uniform_int_distribution<uint64_t> dist_u64(0, std::numeric_limits<uint64_t>::max());
for (int i = 0; i < 10000; i++)
{
uint64_t x = dist_i32(gen);
int32_t y = dist_i32(gen);
uint64_t res = fast_div(x, y);
std::cout << "fast_div(" << x << ", " << y << ") = " << res;
check(res == x / y);
x = dist_u64(gen);
y = dist_i32(gen);
res = fast_div(x, y);
std::cout << "fast_div(" << x << ", " << y << ") = " << res;
check(res == x / y);
}
#ifdef HAVE_INT128_T
std::uniform_int_distribution<int128_t> dist_i128(0, std::numeric_limits<int128_t>::max());
for (int i = 0; i < 10000; i++)
{
int128_t x = dist_u64(gen);
int32_t y = dist_i32(gen);
int128_t res = fast_div(x, y);
std::cout << "fast_div(" << x << ", " << y << ") = " << res;
check(res == x / y);
x = dist_i128(gen);
y = dist_i32(gen);
res = fast_div(x, y);
std::cout << "fast_div(" << x << ", " << y << ") = " << res;
check(res == x / y);
}
#endif
std::cout << std::endl;
std::cout << "All tests passed successfully!" << std::endl;
return 0;
}
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