99ce66c6fe
Previously, all Fetch objects received an Invocation object in their Load and Store methods. The point of this was that it allowed the Fetch to get data from any of the execution objects. However, every Fetch either just got data directly from its associated execution object or else used a secondary execution object (the input domain) to get indices into their own execution object. This left two potential areas for improvement. First, pulling data out of the Invocation object was unnecessarily complicated. It would be much nicer to get data directly from the associated execution object. Second, when getting index information from the input domain, it was often the case that extra computations were necessary (particularly on structured cell sets). There was no way to share the index information among Fetches, and therefore the computations were replicated. This change removes the Invocation from the Fetch Load and Store. Instead, it passes the associated execution object and a new object type called the ThreadIndices. The ThreadIndices are customized for the input domain and therefore have all the information needed for a redirected lookup. It is also a thread-local object so it can cache computed indices and save on computation time.
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_exec_arg_WorkIndex_h
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#define vtk_m_exec_arg_WorkIndex_h
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#include <vtkm/exec/arg/Fetch.h>
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#include <vtkm/exec/arg/ExecutionSignatureTagBase.h>
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namespace vtkm {
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namespace exec {
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namespace arg {
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/// \brief Aspect tag to use for getting the work index.
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///
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/// The \c AspectTagWorkIndex aspect tag causes the \c Fetch class to ignore
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/// whatever data is in the associated execution object and return the index.
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///
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struct AspectTagWorkIndex { };
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/// \brief The \c ExecutionSignature tag to use to get the work index
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///
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/// When a worklet is dispatched, it broken into pieces defined by the input
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/// domain and scheduled on independent threads. This tag in the \c
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/// ExecutionSignature passes the index for this work. \c WorkletBase contains
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/// a typedef that points to this class.
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///
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struct WorkIndex : vtkm::exec::arg::ExecutionSignatureTagBase
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{
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// The index does not really matter because the fetch is going to ignore it.
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// However, it still has to point to a valid parameter in the
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// ControlSignature because the templating is going to grab a fetch tag
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// whether we use it or not. 1 should be guaranteed to be valid since you
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// need at least one argument for the input domain.
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static const vtkm::IdComponent INDEX = 1;
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typedef vtkm::exec::arg::AspectTagWorkIndex AspectTag;
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};
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template<typename FetchTag, typename ThreadIndicesType, typename ExecObjectType>
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struct Fetch<FetchTag,
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vtkm::exec::arg::AspectTagWorkIndex,
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ThreadIndicesType,
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ExecObjectType>
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{
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typedef vtkm::Id ValueType;
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VTKM_EXEC_EXPORT
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vtkm::Id Load(const ThreadIndicesType &indices, const ExecObjectType &) const
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{
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return indices.GetIndex();
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}
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VTKM_EXEC_EXPORT
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void Store(const ThreadIndicesType &,
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const ExecObjectType &,
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const ValueType &) const
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{
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// Store is a no-op.
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}
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};
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}
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}
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} // namespace vtkm::exec::arg
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#endif //vtk_m_exec_arg_WorkIndex_h
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