# Program Listing for File rocrand_threefry4x32_20.h

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    /*
    Copyright 2010-2011, D. E. Shaw Research.
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions, and the following disclaimer.

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      notice, this list of conditions, and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

    * Neither the name of D. E. Shaw Research 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
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    #ifndef ROCRAND_THREEFRY4X32_20_H_
    #define ROCRAND_THREEFRY4X32_20_H_

    #ifndef FQUALIFIERS
        #define FQUALIFIERS __forceinline__ __device__
    #endif // FQUALIFIERS

    #include "rocrand/rocrand_threefry4_impl.h"

    namespace rocrand_device
    {

    class threefry4x32_20_engine : public threefry_engine4_base<uint4, unsigned int, 20>
    {
    public:
        typedef threefry_engine4_base<uint4, unsigned int, 20>::threefry_state_4 threefry4x32_20_state;

        FQUALIFIERS threefry4x32_20_engine(const unsigned long long seed        = 0,
                                           const unsigned long long subsequence = 0,
                                           const unsigned long long offset      = 0)
        {
            this->seed(seed, subsequence, offset);
        }

        FQUALIFIERS void seed(const unsigned long long seed        = 0,
                              const unsigned long long subsequence = 0,
                              const unsigned long long offset      = 0)
        {
            m_state.counter  = {0U, 0U, 0U, 0U};
            m_state.result   = {0U, 0U, 0U, 0U};
            m_state.substate = 0;

            m_state.key = {static_cast<unsigned int>(seed),
                           static_cast<unsigned int>(seed >> 16),
                           static_cast<unsigned int>(seed >> 32),
                           static_cast<unsigned int>(seed >> 48)};

            this->discard_subsequence_impl(subsequence);
            this->discard(offset);
            m_state.result = this->threefry_rounds(m_state.counter, m_state.key);
        }
    }; // threefry4x32_20_engine class

    } // end namespace rocrand_device

    typedef rocrand_device::threefry4x32_20_engine rocrand_state_threefry4x32_20;

    FQUALIFIERS void rocrand_init(const unsigned long long       seed,
                                  const unsigned long long       subsequence,
                                  const unsigned long long       offset,
                                  rocrand_state_threefry4x32_20* state)
    {
        *state = rocrand_state_threefry4x32_20(seed, subsequence, offset);
    }

    FQUALIFIERS unsigned int rocrand(rocrand_state_threefry4x32_20* state)
    {
        return state->next();
    }

    FQUALIFIERS uint4 rocrand4(rocrand_state_threefry4x32_20* state)
    {
        return state->next4();
    }

    #endif // ROCRAND_THREEFRY4X32_20_H_