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98 lines
1.6 KiB
98 lines
1.6 KiB
11 years ago
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/*
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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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