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88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/lattice/Lattice_where.h
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Copyright (C) 2015
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Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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Author: Peter Boyle <peterboyle@Peters-MacBook-Pro-2.local>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef GRID_LATTICE_WHERE_H
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#define GRID_LATTICE_WHERE_H
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namespace Grid {
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// Must implement the predicate gating the
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// Must be able to reduce the predicate down to a single vInteger per site.
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// Must be able to require the type be iScalar x iScalar x ....
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// give a GetVtype method in iScalar
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// and blow away the tensor structures.
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//
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template<class vobj,class iobj>
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inline void whereWolf(Lattice<vobj> &ret,const Lattice<iobj> &predicate,Lattice<vobj> &iftrue,Lattice<vobj> &iffalse)
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{
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conformable(iftrue,iffalse);
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conformable(iftrue,predicate);
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conformable(iftrue,ret);
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GridBase *grid=iftrue.Grid();
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typedef typename vobj::scalar_object scalar_object;
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typedef typename vobj::scalar_type scalar_type;
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typedef typename vobj::vector_type vector_type;
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typedef typename iobj::vector_type mask_type;
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const int Nsimd = grid->Nsimd();
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autoView(iftrue_v,iftrue,CpuRead);
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autoView(iffalse_v,iffalse,CpuRead);
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autoView(predicate_v,predicate,CpuRead);
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autoView(ret_v,ret,CpuWrite);
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Integer NN= grid->oSites();
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thread_for(ss,NN,{
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Integer mask;
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scalar_object trueval;
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scalar_object falseval;
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for(int l=0;l<Nsimd;l++){
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trueval =extractLane(l,iftrue_v[ss]);
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falseval=extractLane(l,iffalse_v[ss]);
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mask =extractLane(l,predicate_v[ss]);
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if (mask) falseval=trueval;
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insertLane(l,ret_v[ss],falseval);
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}
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});
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}
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template<class vobj,class iobj>
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inline Lattice<vobj> whereWolf(const Lattice<iobj> &predicate,Lattice<vobj> &iftrue,Lattice<vobj> &iffalse)
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{
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conformable(iftrue,iffalse);
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conformable(iftrue,predicate);
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Lattice<vobj> ret(iftrue.Grid());
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whereWolf(ret,predicate,iftrue,iffalse);
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return ret;
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}
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}
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#endif
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