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323 lines
15 KiB
323 lines
15 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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/*! \file transform_scan.h
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* \brief Fused transform / prefix-sum
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*/
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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/detail/execution_policy.h>
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namespace thrust
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{
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/*! \addtogroup algorithms
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*/
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/*! \addtogroup prefixsums Prefix Sums
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* \ingroup algorithms
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* \{
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*/
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/*! \addtogroup transformed_prefixsums Transformed Prefix Sums
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* \ingroup prefixsums
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* \{
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*/
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/*! \p transform_inclusive_scan fuses the \p transform and \p inclusive_scan
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* operations. \p transform_inclusive_scan is equivalent to performing a
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* tranformation defined by \p unary_op into a temporary sequence and then
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* performing an \p inclusive_scan on the tranformed sequence. In most
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* cases, fusing these two operations together is more efficient, since
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* fewer memory reads and writes are required. In \p transform_inclusive_scan,
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* <tt>unary_op(\*first)</tt> is assigned to <tt>\*result</tt> and the result
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* of <tt>binary_op(unary_op(\*first), unary_op(\*(first + 1)))</tt> is
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* assigned to <tt>\*(result + 1)</tt>, and so on. The transform scan
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* operation is permitted to be in-place.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the input sequence.
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* \param last The end of the input sequence.
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* \param result The beginning of the output sequence.
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* \param unary_op The function used to tranform the input sequence.
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* \param binary_op The associatve operator used to 'sum' transformed values.
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* \return The end of the output sequence.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
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* and \c InputIterator's \c value_type is convertible to \c unary_op's input type.
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* \tparam OutputIterator is a model of <a href="http://www.sgi.com/tech/stl/OutputIterator.html">Output Iterator</a>.
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html">Unary Function</a>
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* and accepts inputs of \c InputIterator's \c value_type. \c UnaryFunction's result_type
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* is convertable to \c OutputIterator's \c value_type.
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* \tparam AssociativeOperator is a model of <a href="http://www.sgi.com/tech/stl/BinaryFunction.html">Binary Function</a>
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* and \c AssociativeOperator's \c result_type is
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* convertible to \c OutputIterator's \c value_type.
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*
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* \pre \p first may equal \p result, but the range <tt>[first, last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap otherwise.
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*
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* The following code snippet demonstrates how to use \p transform_inclusive_scan using the
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* \p thrust::host execution policy for parallelization:
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*
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* \code
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* #include <thrust/transform_scan.h>
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* #include <thrust/execution_policy.h>
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* ...
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*
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* int data[6] = {1, 0, 2, 2, 1, 3};
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*
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* thrust::negate<int> unary_op;
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* thrust::plus<int> binary_op;
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*
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* thrust::transform_inclusive_scan(thrust::host, data, data + 6, data, unary_op, binary_op); // in-place scan
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*
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* // data is now {-1, -1, -3, -5, -6, -9}
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* \endcode
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*
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* \see \p transform
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* \see \p inclusive_scan
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*
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*/
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template<typename DerivedPolicy,
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typename InputIterator,
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typename OutputIterator,
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typename UnaryFunction,
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typename AssociativeOperator>
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OutputIterator transform_inclusive_scan(const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
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InputIterator first,
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InputIterator last,
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OutputIterator result,
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UnaryFunction unary_op,
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AssociativeOperator binary_op);
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/*! \p transform_inclusive_scan fuses the \p transform and \p inclusive_scan
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* operations. \p transform_inclusive_scan is equivalent to performing a
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* tranformation defined by \p unary_op into a temporary sequence and then
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* performing an \p inclusive_scan on the tranformed sequence. In most
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* cases, fusing these two operations together is more efficient, since
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* fewer memory reads and writes are required. In \p transform_inclusive_scan,
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* <tt>unary_op(\*first)</tt> is assigned to <tt>\*result</tt> and the result
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* of <tt>binary_op(unary_op(\*first), unary_op(\*(first + 1)))</tt> is
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* assigned to <tt>\*(result + 1)</tt>, and so on. The transform scan
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* operation is permitted to be in-place.
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*
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* \param first The beginning of the input sequence.
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* \param last The end of the input sequence.
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* \param result The beginning of the output sequence.
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* \param unary_op The function used to tranform the input sequence.
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* \param binary_op The associatve operator used to 'sum' transformed values.
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* \return The end of the output sequence.
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*
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
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* and \c InputIterator's \c value_type is convertible to \c unary_op's input type.
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* \tparam OutputIterator is a model of <a href="http://www.sgi.com/tech/stl/OutputIterator.html">Output Iterator</a>.
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html">Unary Function</a>
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* and accepts inputs of \c InputIterator's \c value_type. \c UnaryFunction's result_type
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* is convertable to \c OutputIterator's \c value_type.
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* \tparam AssociativeOperator is a model of <a href="http://www.sgi.com/tech/stl/BinaryFunction.html">Binary Function</a>
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* and \c AssociativeOperator's \c result_type is
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* convertible to \c OutputIterator's \c value_type.
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*
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* \pre \p first may equal \p result, but the range <tt>[first, last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap otherwise.
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*
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* The following code snippet demonstrates how to use \p transform_inclusive_scan
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*
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* \code
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* #include <thrust/transform_scan.h>
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*
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* int data[6] = {1, 0, 2, 2, 1, 3};
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*
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* thrust::negate<int> unary_op;
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* thrust::plus<int> binary_op;
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*
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* thrust::transform_inclusive_scan(data, data + 6, data, unary_op, binary_op); // in-place scan
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*
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* // data is now {-1, -1, -3, -5, -6, -9}
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* \endcode
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*
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* \see \p transform
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* \see \p inclusive_scan
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*
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*/
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template<typename InputIterator,
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typename OutputIterator,
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typename UnaryFunction,
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typename AssociativeOperator>
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OutputIterator transform_inclusive_scan(InputIterator first,
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InputIterator last,
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OutputIterator result,
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UnaryFunction unary_op,
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AssociativeOperator binary_op);
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/*! \p transform_exclusive_scan fuses the \p transform and \p exclusive_scan
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* operations. \p transform_exclusive_scan is equivalent to performing a
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* tranformation defined by \p unary_op into a temporary sequence and then
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* performing an \p exclusive_scan on the tranformed sequence. In most
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* cases, fusing these two operations together is more efficient, since
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* fewer memory reads and writes are required. In
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* \p transform_exclusive_scan, \p init is assigned to <tt>\*result</tt>
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* and the result of <tt>binary_op(init, unary_op(\*first))</tt> is assigned
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* to <tt>\*(result + 1)</tt>, and so on. The transform scan operation is
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* permitted to be in-place.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the input sequence.
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* \param last The end of the input sequence.
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* \param result The beginning of the output sequence.
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* \param unary_op The function used to tranform the input sequence.
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* \param init The initial value of the \p exclusive_scan
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* \param binary_op The associatve operator used to 'sum' transformed values.
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* \return The end of the output sequence.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
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* and \c InputIterator's \c value_type is convertible to \c unary_op's input type.
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* \tparam OutputIterator is a model of <a href="http://www.sgi.com/tech/stl/OutputIterator.html">Output Iterator</a>.
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html">Unary Function</a>
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* and accepts inputs of \c InputIterator's \c value_type. \c UnaryFunction's result_type
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* is convertable to \c OutputIterator's \c value_type.
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* \tparam T is convertible to \c OutputIterator's \c value_type.
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* \tparam AssociativeOperator is a model of <a href="http://www.sgi.com/tech/stl/BinaryFunction.html">Binary Function</a>
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* and \c AssociativeOperator's \c result_type is
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* convertible to \c OutputIterator's \c value_type.
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*
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* \pre \p first may equal \p result, but the range <tt>[first, last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap otherwise.
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*
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* The following code snippet demonstrates how to use \p transform_exclusive_scan using the
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* \p thrust::host execution policy for parallelization:
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*
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* \code
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* #include <thrust/transform_scan.h>
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* #include <thrust/execution_policy.h>
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* ...
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*
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* int data[6] = {1, 0, 2, 2, 1, 3};
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*
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* thrust::negate<int> unary_op;
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* thrust::plus<int> binary_op;
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*
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* thrust::transform_exclusive_scan(thrust::host, data, data + 6, data, unary_op, 4, binary_op); // in-place scan
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*
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* // data is now {4, 3, 3, 1, -1, -2}
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* \endcode
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*
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* \see \p transform
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* \see \p exclusive_scan
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*
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*/
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template<typename DerivedPolicy,
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typename InputIterator,
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typename OutputIterator,
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typename UnaryFunction,
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typename T,
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typename AssociativeOperator>
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OutputIterator transform_exclusive_scan(const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
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InputIterator first,
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InputIterator last,
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OutputIterator result,
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UnaryFunction unary_op,
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T init,
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AssociativeOperator binary_op);
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/*! \p transform_exclusive_scan fuses the \p transform and \p exclusive_scan
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* operations. \p transform_exclusive_scan is equivalent to performing a
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* tranformation defined by \p unary_op into a temporary sequence and then
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* performing an \p exclusive_scan on the tranformed sequence. In most
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* cases, fusing these two operations together is more efficient, since
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* fewer memory reads and writes are required. In
|
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* \p transform_exclusive_scan, \p init is assigned to <tt>\*result</tt>
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* and the result of <tt>binary_op(init, unary_op(\*first))</tt> is assigned
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* to <tt>\*(result + 1)</tt>, and so on. The transform scan operation is
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* permitted to be in-place.
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|
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*
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* \param first The beginning of the input sequence.
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* \param last The end of the input sequence.
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* \param result The beginning of the output sequence.
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* \param unary_op The function used to tranform the input sequence.
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* \param init The initial value of the \p exclusive_scan
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* \param binary_op The associatve operator used to 'sum' transformed values.
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* \return The end of the output sequence.
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||
|
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*
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||
|
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
|
||
|
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* and \c InputIterator's \c value_type is convertible to \c unary_op's input type.
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* \tparam OutputIterator is a model of <a href="http://www.sgi.com/tech/stl/OutputIterator.html">Output Iterator</a>.
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||
|
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html">Unary Function</a>
|
||
|
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* and accepts inputs of \c InputIterator's \c value_type. \c UnaryFunction's result_type
|
||
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* is convertable to \c OutputIterator's \c value_type.
|
||
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* \tparam T is convertible to \c OutputIterator's \c value_type.
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||
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* \tparam AssociativeOperator is a model of <a href="http://www.sgi.com/tech/stl/BinaryFunction.html">Binary Function</a>
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||
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* and \c AssociativeOperator's \c result_type is
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* convertible to \c OutputIterator's \c value_type.
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||
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*
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||
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* \pre \p first may equal \p result, but the range <tt>[first, last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap otherwise.
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||
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*
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* The following code snippet demonstrates how to use \p transform_exclusive_scan
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||
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*
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||
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* \code
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||
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* #include <thrust/transform_scan.h>
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*
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* int data[6] = {1, 0, 2, 2, 1, 3};
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*
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* thrust::negate<int> unary_op;
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* thrust::plus<int> binary_op;
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||
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*
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* thrust::transform_exclusive_scan(data, data + 6, data, unary_op, 4, binary_op); // in-place scan
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*
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* // data is now {4, 3, 3, 1, -1, -2}
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* \endcode
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*
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* \see \p transform
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* \see \p exclusive_scan
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*
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*/
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template<typename InputIterator,
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typename OutputIterator,
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typename UnaryFunction,
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typename T,
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typename AssociativeOperator>
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OutputIterator transform_exclusive_scan(InputIterator first,
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InputIterator last,
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OutputIterator result,
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UnaryFunction unary_op,
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T init,
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AssociativeOperator binary_op);
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/*! \} // end transformed_prefixsums
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*/
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/*! \} // end prefixsums
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||
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*/
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} // end namespace thrust
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#include <thrust/detail/transform_scan.inl>
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