Grid/lib/cartesian/Cartesian_full.h

/*************************************************************************************

    Grid physics library, www.github.com/paboyle/Grid 

    Source file: ./lib/cartesian/Cartesian_full.h

    Copyright (C) 2015

Author: Peter Boyle <paboyle@ph.ed.ac.uk>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

    See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/*  END LEGAL */
#ifndef GRID_CARTESIAN_FULL_H
#define GRID_CARTESIAN_FULL_H

NAMESPACE_BEGIN(Grid);
    
/////////////////////////////////////////////////////////////////////////////////////////
// Grid Support.
/////////////////////////////////////////////////////////////////////////////////////////

class GridCartesian: public GridBase {

public:
  int dummy;
  virtual int  CheckerBoardFromOindexTable (int Oindex) {
    return 0;
  }
  virtual int  CheckerBoardFromOindex (int Oindex)
  {
    return 0;
  }
  virtual int CheckerBoarded(int dim){
    return 0;
  }
  virtual int CheckerBoard(const std::vector<int> &site){
    return 0;
  }
  virtual int CheckerBoardDestination(int cb,int shift,int dim){
    return 0;
  }
  virtual int CheckerBoardShiftForCB(int source_cb,int dim,int shift, int ocb){
    return shift;
  }
  virtual int CheckerBoardShift(int source_cb,int dim,int shift, int osite){
    return shift;
  }
  /////////////////////////////////////////////////////////////////////////
  // Constructor takes a parent grid and possibly subdivides communicator.
  /////////////////////////////////////////////////////////////////////////
  GridCartesian(const std::vector<int> &dimensions,
		const std::vector<int> &simd_layout,
		const std::vector<int> &processor_grid,
		const GridCartesian &parent) : GridBase(processor_grid,parent,dummy)
  {
    Init(dimensions,simd_layout,processor_grid);
  }
  GridCartesian(const std::vector<int> &dimensions,
		const std::vector<int> &simd_layout,
		const std::vector<int> &processor_grid,
		const GridCartesian &parent,int &split_rank) : GridBase(processor_grid,parent,split_rank)
  {
    Init(dimensions,simd_layout,processor_grid);
  }
  /////////////////////////////////////////////////////////////////////////
  // Construct from comm world
  /////////////////////////////////////////////////////////////////////////
  GridCartesian(const std::vector<int> &dimensions,
		const std::vector<int> &simd_layout,
		const std::vector<int> &processor_grid) : GridBase(processor_grid)
  {
    Init(dimensions,simd_layout,processor_grid);
  }

  virtual ~GridCartesian() = default;

  void Init(const std::vector<int> &dimensions,
	    const std::vector<int> &simd_layout,
	    const std::vector<int> &processor_grid)
  {
    ///////////////////////
    // Grid information
    ///////////////////////
    _ndimension = dimensions.size();

    _fdimensions.resize(_ndimension);
    _gdimensions.resize(_ndimension);
    _ldimensions.resize(_ndimension);
    _rdimensions.resize(_ndimension);
    _simd_layout.resize(_ndimension);
    _lstart.resize(_ndimension);
    _lend.resize(_ndimension);

    _ostride.resize(_ndimension);
    _istride.resize(_ndimension);

    _fsites = _gsites = _osites = _isites = 1;

    for (int d = 0; d < _ndimension; d++)
      {
        _fdimensions[d] = dimensions[d];   // Global dimensions
        _gdimensions[d] = _fdimensions[d]; // Global dimensions
        _simd_layout[d] = simd_layout[d];
        _fsites = _fsites * _fdimensions[d];
        _gsites = _gsites * _gdimensions[d];

        // Use a reduced simd grid
        _ldimensions[d] = _gdimensions[d] / _processors[d]; //local dimensions
        assert(_ldimensions[d] * _processors[d] == _gdimensions[d]);

        _rdimensions[d] = _ldimensions[d] / _simd_layout[d]; //overdecomposition
        assert(_rdimensions[d] * _simd_layout[d] == _ldimensions[d]);

        _lstart[d] = _processor_coor[d] * _ldimensions[d];
        _lend[d] = _processor_coor[d] * _ldimensions[d] + _ldimensions[d] - 1;
        _osites *= _rdimensions[d];
        _isites *= _simd_layout[d];

        // Addressing support
        if (d == 0)
	  {
	    _ostride[d] = 1;
	    _istride[d] = 1;
	  }
        else
	  {
	    _ostride[d] = _ostride[d - 1] * _rdimensions[d - 1];
	    _istride[d] = _istride[d - 1] * _simd_layout[d - 1];
	  }
      }

    ///////////////////////
    // subplane information
    ///////////////////////
    _slice_block.resize(_ndimension);
    _slice_stride.resize(_ndimension);
    _slice_nblock.resize(_ndimension);

    int block = 1;
    int nblock = 1;
    for (int d = 0; d < _ndimension; d++)
      nblock *= _rdimensions[d];

    for (int d = 0; d < _ndimension; d++)
      {
        nblock /= _rdimensions[d];
        _slice_block[d] = block;
        _slice_stride[d] = _ostride[d] * _rdimensions[d];
        _slice_nblock[d] = nblock;
        block = block * _rdimensions[d];
      }
  };
};

NAMESPACE_END(Grid);
#endif