mirror of
https://github.com/monero-project/monero.git
synced 2024-12-16 13:26:31 +02:00
49 lines
2.3 KiB
C++
49 lines
2.3 KiB
C++
// Copyright (c) 2019, The Monero Project
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without modification, are
|
|
// permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
|
// conditions and the following disclaimer.
|
|
//
|
|
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
|
// of conditions and the following disclaimer in the documentation and/or other
|
|
// materials provided with the distribution.
|
|
//
|
|
// 3. Neither the name of the copyright holder nor the names of its contributors may be
|
|
// used to endorse or promote products derived from this software without specific
|
|
// prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
|
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
|
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#include <boost/multiprecision/cpp_int.hpp>
|
|
|
|
void div128_64(uint64_t dividend_hi, uint64_t dividend_lo, uint64_t divisor, uint64_t* quotient_hi, uint64_t *quotient_lo, uint64_t *remainder_hi, uint64_t *remainder_lo)
|
|
{
|
|
typedef boost::multiprecision::uint128_t uint128_t;
|
|
|
|
uint128_t dividend = dividend_hi;
|
|
dividend <<= 64;
|
|
dividend |= dividend_lo;
|
|
|
|
uint128_t q, r;
|
|
divide_qr(dividend, uint128_t(divisor), q, r);
|
|
|
|
*quotient_hi = ((q >> 64) & 0xffffffffffffffffull).convert_to<uint64_t>();
|
|
*quotient_lo = (q & 0xffffffffffffffffull).convert_to<uint64_t>();
|
|
if (remainder_hi)
|
|
*remainder_hi = ((r >> 64) & 0xffffffffffffffffull).convert_to<uint64_t>();
|
|
if (remainder_lo)
|
|
*remainder_lo = (r & 0xffffffffffffffffull).convert_to<uint64_t>();
|
|
}
|