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97 lines
1.6 KiB
97 lines
1.6 KiB
/* |
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* Copyright 2008-2012 NVIDIA Corporation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#pragma once |
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namespace thrust |
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{ |
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namespace random |
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{ |
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namespace detail |
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{ |
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template<typename T, T a, T c, T m, bool = (m == 0)> |
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struct static_mod |
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{ |
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static const T q = m / a; |
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static const T r = m % a; |
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__host__ __device__ |
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T operator()(T x) const |
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{ |
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if(a == 1) |
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{ |
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x %= m; |
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} |
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else |
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{ |
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T t1 = a * (x % q); |
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T t2 = r * (x / q); |
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if(t1 >= t2) |
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{ |
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x = t1 - t2; |
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} |
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else |
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{ |
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x = m - t2 + t1; |
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} |
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} |
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if(c != 0) |
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{ |
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const T d = m - x; |
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if(d > c) |
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{ |
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x += c; |
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} |
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else |
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{ |
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x = c - d; |
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} |
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} |
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return x; |
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} |
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}; // end static_mod |
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// Rely on machine overflow handling |
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template<typename T, T a, T c, T m> |
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struct static_mod<T,a,c,m,true> |
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{ |
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__host__ __device__ |
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T operator()(T x) const |
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{ |
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return a * x + c; |
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} |
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}; // end static_mod |
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template<typename T, T a, T c, T m> |
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__host__ __device__ |
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T mod(T x) |
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{ |
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static_mod<T,a,c,m> f; |
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return f(x); |
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} // end static_mod |
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} // end detail |
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} // end random |
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} // end thrust |
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