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///
/// @file next_power_of_2.cpp
/// @brief Round up to nearest power of 2.
///
/// Copyright (C) 2017 Kim Walisch, <kim.walisch@gmail.com>
///
/// This file is distributed under the BSD License. See the COPYING
/// file in the top level directory.
///
#include <imath.hpp>
#include <stdint.h>
#include <iostream>
#include <cstdlib>
void check(bool OK)
{
std::cout << " " << (OK ? "OK" : "ERROR") << "\n";
if (!OK)
std::exit(1);
}
int main()
{
uint64_t n;
uint64_t res1;
uint64_t res2;
for (uint64_t i = 0; i < 64; i++)
{
n = 1ull << i;
res1 = next_power_of_2(n);
res2 = n;
std::cout << "next_power_of_2(" << n << ") = " << res1;
check(res1 == res2);
}
for (uint64_t i = 0; i < 63; i++)
{
n = (1ull << i) + 1;
res1 = next_power_of_2(n);
res2 = 1ull << (i + 1);
std::cout << "next_power_of_2(" << n << ") = " << res1;
check(res1 == res2);
}
for (uint64_t i = 2; i < 64; i++)
{
n = (1ull << i) - 1;
res1 = next_power_of_2(n);
res2 = 1ull << i;
std::cout << "next_power_of_2(" << n << ") = " << res1;
check(res1 == res2);
}
std::cout << std::endl;
std::cout << "All tests passed successfully!" << std::endl;
return 0;
}
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