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///
/// @file libdivide.cpp
/// @brief Test the branchfree divider of libdivide.h
///
/// Copyright (C) 2018 Kim Walisch, <kim.walisch@gmail.com>
///
/// This file is distributed under the BSD License. See the COPYING
/// file in the top level directory.
///
#include <libdivide.h>
#include <stdint.h>
uint64_t dividends[20] =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 63, 101, 511,
1 << 5, 1 << 9, 1 << 20,
(uint64_t) ((1ull << 31) - 1),
(uint64_t) ((1ull << 63) - 1),
(uint32_t) (~0ull),
(uint64_t) (~0ull)
};
int main()
{
for (int i = 0; i < 20; i++)
{
for (int j = 2; j < 10000; j++)
{
libdivide::divider<uint64_t, libdivide::BRANCHFREE> fast_d(j);
uint64_t res1 = dividends[i] / j;
uint64_t res2 = dividends[i] / fast_d;
if (res1 != res2)
return 1;
}
}
for (int i = 0; i < 20; i++)
{
for (int j = 2; j < 20; j++)
{
libdivide::divider<uint64_t, libdivide::BRANCHFREE> fast_d(dividends[j]);
uint64_t res1 = dividends[i] / dividends[j];
uint64_t res2 = dividends[i] / fast_d;
if (res1 != res2)
return 1;
}
}
return 0;
}
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