mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
45abbb5c75
Previously, each VecFromPortalPermute (the type that held the from field values) held its own copy of the indices. For point to cell on structured grids, this was a lot of repeated data values, which has the potential to fill up cache and registers. Instead, just use pointer references.
143 lines
4.1 KiB
C++
143 lines
4.1 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 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 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_internal_VecFromPortalPermute_h
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#define vtk_m_exec_internal_VecFromPortalPermute_h
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#include <vtkm/Math.h>
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#include <vtkm/Types.h>
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#include <vtkm/TypeTraits.h>
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#include <vtkm/VecTraits.h>
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namespace vtkm {
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namespace exec {
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namespace internal {
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/// \brief A short vector from an ArrayPortal and a vector of indices.
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///
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/// The \c VecFromPortalPermute class is a Vec-like class that holds an array
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/// portal and a second Vec-like containing indices into the array. Each value
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/// of this vector is the value from the array with the respective index.
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///
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template<typename IndexVecType, typename PortalType>
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class VecFromPortalPermute
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{
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public:
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typedef typename PortalType::ValueType ComponentType;
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VTKM_EXEC_EXPORT
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VecFromPortalPermute() { }
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VTKM_EXEC_EXPORT
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VecFromPortalPermute(const IndexVecType *indices, const PortalType &portal)
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: Indices(indices), Portal(portal) { }
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VTKM_EXEC_EXPORT
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vtkm::IdComponent GetNumberOfComponents() const {
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return this->Indices->GetNumberOfComponents();
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}
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template<vtkm::IdComponent DestSize>
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VTKM_EXEC_EXPORT
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void CopyInto(vtkm::Vec<ComponentType,DestSize> &dest) const
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{
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vtkm::IdComponent numComponents =
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vtkm::Min(DestSize, this->GetNumberOfComponents());
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for (vtkm::IdComponent index = 0; index < numComponents; index++)
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{
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dest[index] = (*this)[index];
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}
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}
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VTKM_EXEC_EXPORT
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ComponentType operator[](vtkm::IdComponent index) const
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{
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return this->Portal.Get((*this->Indices)[index]);
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}
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private:
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const IndexVecType *Indices;
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PortalType Portal;
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};
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}
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}
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} // namespace vtkm::exec::internal
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// Implementations of traits classes, which by definition are in the vtkm
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// namespace.
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namespace vtkm {
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template<typename IndexVecType, typename PortalType>
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struct TypeTraits<
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vtkm::exec::internal::VecFromPortalPermute<IndexVecType,PortalType> >
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{
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private:
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typedef vtkm::exec::internal::VecFromPortalPermute<IndexVecType,PortalType>
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VecType;
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typedef typename PortalType::ValueType ComponentType;
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public:
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typedef typename vtkm::TypeTraits<ComponentType>::NumericTag NumericTag;
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typedef TypeTraitsVectorTag DimensionalityTag;
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VTKM_EXEC_EXPORT
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static VecType ZeroInitialization()
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{
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return VecType();
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}
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};
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template<typename IndexVecType, typename PortalType>
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struct VecTraits<
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vtkm::exec::internal::VecFromPortalPermute<IndexVecType,PortalType> >
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{
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typedef vtkm::exec::internal::VecFromPortalPermute<IndexVecType,PortalType>
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VecType;
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typedef typename VecType::ComponentType ComponentType;
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typedef vtkm::VecTraitsTagMultipleComponents HasMultipleComponents;
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typedef vtkm::VecTraitsTagSizeVariable IsSizeStatic;
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VTKM_EXEC_EXPORT
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static vtkm::IdComponent GetNumberOfComponents(const VecType &vector) {
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return vector.GetNumberOfComponents();
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}
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VTKM_EXEC_EXPORT
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static ComponentType GetComponent(const VecType &vector,
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vtkm::IdComponent componentIndex)
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{
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return vector[componentIndex];
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}
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template<vtkm::IdComponent destSize>
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VTKM_EXEC_EXPORT
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static void CopyInto(const VecType &src,
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vtkm::Vec<ComponentType,destSize> &dest)
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{
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src.CopyInto(dest);
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}
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};
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} // namespace vtkm
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#endif //vtk_m_exec_internal_VecFromPortalPermute_h
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