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64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
#ifndef GRID_WHERE_H
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#define GRID_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 where(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_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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const int words = sizeof(vobj)/sizeof(vector_type);
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std::vector<Integer> mask(Nsimd);
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std::vector<std::vector<scalar_type> > truevals (Nsimd,std::vector<scalar_type>(words) );
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std::vector<std::vector<scalar_type> > falsevals(Nsimd,std::vector<scalar_type>(words) );
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std::vector<scalar_type *> pointers(Nsimd);
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#pragma omp parallel for
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for(int ss=0;ss<iftrue._grid->oSites(); ss++){
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for(int s=0;s<Nsimd;s++) pointers[s] = & truevals[s][0];
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extract(iftrue._odata[ss] ,pointers);
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for(int s=0;s<Nsimd;s++) pointers[s] = & falsevals[s][0];
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extract(iffalse._odata[ss] ,pointers);
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extract(TensorRemove(predicate._odata[ss]),mask);
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for(int s=0;s<Nsimd;s++){
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if (mask[s]) pointers[s]=&truevals[s][0];
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else pointers[s]=&falsevals[s][0];
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}
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merge(ret._odata[ss],pointers);
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}
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}
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template<class vobj,class iobj>
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inline Lattice<vobj> where(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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where(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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