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API library: /home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-rocrand/checkouts/develop/projects/rocrand/library/include/rocrand/rocrand_threefry2x64_20.h Source File

 // Copyright (c) 2022-2025 Advanced Micro Devices, Inc. All rights reserved.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
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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.
  
 * 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.
  
 * 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
 "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
 OWNER 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.
 */
  
 #ifndef ROCRAND_THREEFRY2X64_20_H_
 #define ROCRAND_THREEFRY2X64_20_H_
  
 #include "rocrand/rocrand_threefry2_impl.h"
  
 #include <hip/hip_runtime.h>
  
 namespace rocrand_device
 {
  
 class threefry2x64_20_engine : public threefry_engine2_base<ulonglong2, unsigned long long, 20>
 {
 public:
     ROCRAND_DEPRECATED("Alias \"threefry2x64_20_state\" is deprecated. Use \"state_type\" instead.")
     typedef threefry_engine2_base<ulonglong2, unsigned long long, 20>::threefry_state_2
         threefry2x64_20_state;
  
     __forceinline__ __device__ __host__ threefry2x64_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);
     }
  
     __forceinline__ __device__ __host__ void seed(const unsigned long long seed        = 0,
                                                   const unsigned long long subsequence = 0,
                                                   const unsigned long long offset      = 0)
     {
         m_state.counter  = {0ULL, 0ULL};
         m_state.key      = {seed, seed >> 32};
         m_state.result   = {0ULL, 0ULL};
         m_state.substate = 0;
  
         this->discard_subsequence_impl(subsequence);
         this->discard(offset);
         m_state.result = this->threefry_rounds(m_state.counter, m_state.key);
     }
  
 }; // threefry2x64_20_engine class
  
 } // end namespace rocrand_device
  
 typedef rocrand_device::threefry2x64_20_engine rocrand_state_threefry2x64_20;
  
 __forceinline__ __device__ __host__
 void rocrand_init(const unsigned long long       seed,
                   const unsigned long long       subsequence,
                   const unsigned long long       offset,
                   rocrand_state_threefry2x64_20* state)
 {
     *state = rocrand_state_threefry2x64_20(seed, subsequence, offset);
 }
  
 __forceinline__ __device__ __host__
 unsigned long long rocrand(rocrand_state_threefry2x64_20* state)
 {
     return state->next();
 }
  
 __forceinline__ __device__ __host__
 ulonglong2 rocrand2(rocrand_state_threefry2x64_20* state)
 {
     return state->next2();
 }
  
 #endif // ROCRAND_THREEFRY2X64_20_H_