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114 lines
3.0 KiB
114 lines
3.0 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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#include <thrust/detail/config.h>
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namespace thrust
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{
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namespace system
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{
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namespace detail
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{
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namespace internal
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{
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template <typename IndexType>
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class index_range
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{
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public:
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typedef IndexType index_type;
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__host__ __device__
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index_range(index_type begin, index_type end) : m_begin(begin), m_end(end) {}
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__host__ __device__
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index_type begin(void) const { return m_begin; }
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__host__ __device__
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index_type end(void) const { return m_end; }
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__host__ __device__
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index_type size(void) const { return m_end - m_begin; }
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private:
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index_type m_begin;
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index_type m_end;
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};
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template <typename IndexType>
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class uniform_decomposition
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{
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public:
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typedef IndexType index_type;
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typedef index_range<index_type> range_type;
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uniform_decomposition(index_type N, index_type granularity, index_type max_intervals)
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: m_N(N),
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m_intervals((N + granularity - 1) / granularity),
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m_threshold(0),
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m_small_interval(granularity),
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m_large_interval(0)
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{
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if(m_intervals > max_intervals)
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{
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m_small_interval = granularity * (m_intervals / max_intervals);
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m_large_interval = m_small_interval + granularity;
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m_threshold = m_intervals % max_intervals;
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m_intervals = max_intervals;
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}
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}
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__host__ __device__
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index_range<index_type> operator[](const index_type& i) const
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{
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if (i < m_threshold)
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{
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index_type begin = m_large_interval * i;
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index_type end = begin + m_large_interval;
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return range_type(begin, end);
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}
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else
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{
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index_type begin = m_large_interval * m_threshold + m_small_interval * (i - m_threshold);
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index_type end = (begin + m_small_interval < m_N) ? begin + m_small_interval : m_N;
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return range_type(begin, end);
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}
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}
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__host__ __device__
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index_type size(void) const
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{
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return m_intervals;
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}
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private:
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index_type m_N;
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index_type m_intervals;
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index_type m_threshold;
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index_type m_small_interval;
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index_type m_large_interval;
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};
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} // end namespace internal
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} // end namespace detail
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} // end namespace system
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} // end namespace thrust
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