GOSTCoin CUDA miner project, compatible with most nvidia cards, containing only gostd algo
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/*
* Copyright 2008-2012 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file subtract_with_carry_engine.h
* \brief A subtract-with-carry pseudorandom number generator
* based on Marsaglia & Zaman.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/random/detail/random_core_access.h>
#include <thrust/detail/cstdint.h>
#include <cstddef> // for size_t
#include <iostream>
namespace thrust
{
namespace random
{
/*! \addtogroup random_number_engine_templates
* \{
*/
/*! \class subtract_with_carry_engine
* \brief A \p subtract_with_carry_engine random number engine produces unsigned
* integer random numbers using the subtract with carry algorithm of Marsaglia & Zaman.
*
* The generation algorithm is performed as follows:
* -# Let <tt>Y = X_{i-s}- X_{i-r} - c</tt>.
* -# Set <tt>X_i</tt> to <tt>y = T mod m</tt>. Set \c c to \c 1 if <tt>Y < 0</tt>, otherwise set \c c to \c 0.
*
* This algorithm corresponds to a modular linear function of the form
*
* <tt>TA(x_i) = (a * x_i) mod b</tt>, where \c b is of the form <tt>m^r - m^s + 1</tt> and
* <tt>a = b - (b-1)/m</tt>.
*
* \tparam UIntType The type of unsigned integer to produce.
* \tparam w The word size of the produced values (<tt> w <= sizeof(UIntType)</tt>).
* \tparam s The short lag of the generation algorithm.
* \tparam r The long lag of the generation algorithm.
*
* \note Inexperienced users should not use this class template directly. Instead, use
* \p ranlux24_base or \p ranlux48_base, which are instances of \p subtract_with_carry_engine.
*
* \see thrust::random::ranlux24_base
* \see thrust::random::ranlux48_base
*/
template<typename UIntType, size_t w, size_t s, size_t r>
class subtract_with_carry_engine
{
/*! \cond
*/
private:
static const UIntType modulus = UIntType(1) << w;
/*! \endcond
*/
public:
// types
/*! \typedef result_type
* \brief The type of the unsigned integer produced by this \p subtract_with_carry_engine.
*/
typedef UIntType result_type;
// engine characteristics
/*! The word size of the produced values.
*/
static const size_t word_size = w;
/*! The size of the short lag used in the generation algorithm.
*/
static const size_t short_lag = s;
/*! The size of the long lag used in the generation algorithm.
*/
static const size_t long_lag = r;
/*! The smallest value this \p subtract_with_carry_engine may potentially produce.
*/
static const result_type min = 0;
/*! The largest value this \p subtract_with_carry_engine may potentially produce.
*/
static const result_type max = modulus - 1;
/*! The default seed of this \p subtract_with_carry_engine.
*/
static const result_type default_seed = 19780503u;
// constructors and seeding functions
/*! This constructor, which optionally accepts a seed, initializes a new
* \p subtract_with_carry_engine.
*
* \param value The seed used to intialize this \p subtract_with_carry_engine's state.
*/
__host__ __device__
explicit subtract_with_carry_engine(result_type value = default_seed);
/*! This method initializes this \p subtract_with_carry_engine's state, and optionally accepts
* a seed value.
*
* \param value The seed used to initializes this \p subtract_with_carry_engine's state.
*/
__host__ __device__
void seed(result_type value = default_seed);
// generating functions
/*! This member function produces a new random value and updates this \p subtract_with_carry_engine's state.
* \return A new random number.
*/
__host__ __device__
result_type operator()(void);
/*! This member function advances this \p subtract_with_carry_engine's state a given number of times
* and discards the results.
*
* \param z The number of random values to discard.
* \note This function is provided because an implementation may be able to accelerate it.
*/
__host__ __device__
void discard(unsigned long long z);
/*! \cond
*/
private:
result_type m_x[long_lag];
unsigned int m_k;
int m_carry;
friend struct thrust::random::detail::random_core_access;
__host__ __device__
bool equal(const subtract_with_carry_engine &rhs) const;
template<typename CharT, typename Traits>
std::basic_ostream<CharT,Traits>& stream_out(std::basic_ostream<CharT,Traits> &os) const;
template<typename CharT, typename Traits>
std::basic_istream<CharT,Traits>& stream_in(std::basic_istream<CharT,Traits> &is);
/*! \endcond
*/
}; // end subtract_with_carry_engine
/*! This function checks two \p subtract_with_carry_engines for equality.
* \param lhs The first \p subtract_with_carry_engine to test.
* \param rhs The second \p subtract_with_carry_engine to test.
* \return \c true if \p lhs is equal to \p rhs; \c false, otherwise.
*/
template<typename UIntType_, size_t w_, size_t s_, size_t r_>
__host__ __device__
bool operator==(const subtract_with_carry_engine<UIntType_,w_,s_,r_> &lhs,
const subtract_with_carry_engine<UIntType_,w_,s_,r_> &rhs);
/*! This function checks two \p subtract_with_carry_engines for inequality.
* \param lhs The first \p subtract_with_carry_engine to test.
* \param rhs The second \p subtract_with_carry_engine to test.
* \return \c true if \p lhs is not equal to \p rhs; \c false, otherwise.
*/
template<typename UIntType_, size_t w_, size_t s_, size_t r_>
__host__ __device__
bool operator!=(const subtract_with_carry_engine<UIntType_,w_,s_,r_>&lhs,
const subtract_with_carry_engine<UIntType_,w_,s_,r_>&rhs);
/*! This function streams a subtract_with_carry_engine to a \p std::basic_ostream.
* \param os The \p basic_ostream to stream out to.
* \param e The \p subtract_with_carry_engine to stream out.
* \return \p os
*/
template<typename UIntType_, size_t w_, size_t s_, size_t r_,
typename CharT, typename Traits>
std::basic_ostream<CharT,Traits>&
operator<<(std::basic_ostream<CharT,Traits> &os,
const subtract_with_carry_engine<UIntType_,w_,s_,r_> &e);
/*! This function streams a subtract_with_carry_engine in from a std::basic_istream.
* \param is The \p basic_istream to stream from.
* \param e The \p subtract_with_carry_engine to stream in.
* \return \p is
*/
template<typename UIntType_, size_t w_, size_t s_, size_t r_,
typename CharT, typename Traits>
std::basic_istream<CharT,Traits>&
operator>>(std::basic_istream<CharT,Traits> &is,
subtract_with_carry_engine<UIntType_,w_,s_,r_> &e);
/*! \} // end random_number_engine_templates
*/
/*! \addtogroup predefined_random
* \{
*/
// XXX N2111 uses uint_fast32_t here
/*! \typedef ranlux24_base
* \brief A random number engine with predefined parameters which implements the
* base engine of the \p ranlux24 random number engine.
* \note The 10000th consecutive invocation of a default-constructed object of type \p ranlux24_base
* shall produce the value \c 7937952 .
*/
typedef subtract_with_carry_engine<thrust::detail::uint32_t, 24, 10, 24> ranlux24_base;
// XXX N2111 uses uint_fast64_t here
/*! \typedef ranlux48_base
* \brief A random number engine with predefined parameters which implements the
* base engine of the \p ranlux48 random number engine.
* \note The 10000th consecutive invocation of a default-constructed object of type \p ranlux48_base
* shall produce the value \c 192113843633948 .
*/
typedef subtract_with_carry_engine<thrust::detail::uint64_t, 48, 5, 12> ranlux48_base;
/*! \} // end predefined_random
*/
} // end random
// import names into thrust::
using random::subtract_with_carry_engine;
using random::ranlux24_base;
using random::ranlux48_base;
} // end thrust
#include <thrust/random/detail/subtract_with_carry_engine.inl>