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///
/// @file fast_div.cpp
/// @brief Test fast_div(x, y) function
///
/// Copyright (C) 2024 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 <random>
using namespace primecount;
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, pstd::numeric_limits<int32_t>::max());
std::uniform_int_distribution<uint64_t> dist_u64(0, pstd::numeric_limits<uint64_t>::max());
// Test unsigned/signed
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<uint64_t> dist_u62(0, uint64_t(1ull << 62));
// Test signed/signed
for (int i = 0; i < 10000; i++)
{
// Test x < 2^64
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);
// Test x > 2^64
int128_t low = dist_u64(gen);
int128_t high = int128_t(dist_u62(gen)) << 64;
x = high | low;
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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