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Peter Boyle 2019-06-04 20:58:14 +01:00
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Grid/qcd/action/fermion/StaggeredImpl.h Normal file
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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/action/fermion/FermionOperatorImpl.h
Copyright (C) 2015
Author: Peter Boyle <pabobyle@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 */
#pragma once
NAMESPACE_BEGIN(Grid);
template <class S, class Representation = FundamentalRepresentation >
class StaggeredImpl : public PeriodicGaugeImpl<GaugeImplTypes<S, Representation::Dimension > >
{
public:
typedef RealD _Coeff_t ;
static const int Dimension = Representation::Dimension;
static const bool isFundamental = Representation::isFundamental;
static const bool LsVectorised=false;
typedef PeriodicGaugeImpl<GaugeImplTypes<S, Dimension > > Gimpl;
//Necessary?
constexpr bool is_fundamental() const{return Dimension == Nc ? 1 : 0;}
typedef _Coeff_t Coeff_t;
INHERIT_GIMPL_TYPES(Gimpl);
template <typename vtype> using iImplSpinor = iScalar<iScalar<iVector<vtype, Dimension> > >;
template <typename vtype> using iImplHalfSpinor = iScalar<iScalar<iVector<vtype, Dimension> > >;
template <typename vtype> using iImplDoubledGaugeField = iVector<iScalar<iMatrix<vtype, Dimension> >, Nds>;
template <typename vtype> using iImplPropagator = iScalar<iScalar<iMatrix<vtype, Dimension> > >;
typedef iImplSpinor<Simd> SiteSpinor;
typedef iImplHalfSpinor<Simd> SiteHalfSpinor;
typedef iImplDoubledGaugeField<Simd> SiteDoubledGaugeField;
typedef iImplPropagator<Simd> SitePropagator;
typedef Lattice<SiteSpinor> FermionField;
typedef Lattice<SiteDoubledGaugeField> DoubledGaugeField;
typedef Lattice<SitePropagator> PropagatorField;
typedef StaggeredImplParams ImplParams;
typedef SimpleCompressor<SiteSpinor> Compressor;
typedef CartesianStencil<SiteSpinor, SiteSpinor, ImplParams> StencilImpl;
typedef typename StencilImpl::View_type StencilView;
ImplParams Params;
StaggeredImpl(const ImplParams &p = ImplParams()) : Params(p){};
static accelerator_inline void multLink(SiteSpinor &phi,
const SiteDoubledGaugeField &U,
const SiteSpinor &chi,
int mu)
{
mult(&phi(), &U(mu), &chi());
}
static accelerator_inline void multLinkAdd(SiteSpinor &phi,
const SiteDoubledGaugeField &U,
const SiteSpinor &chi,
int mu)
{
mac(&phi(), &U(mu), &chi());
}
template <class ref>
static accelerator_inline void loadLinkElement(Simd &reg, ref &memory)
{
reg = memory;
}
inline void InsertGaugeField(DoubledGaugeField &U_ds,
const GaugeLinkField &U,int mu)
{
PokeIndex<LorentzIndex>(U_ds, U, mu);
}
inline void DoubleStore(GridBase *GaugeGrid,
DoubledGaugeField &UUUds, // for Naik term
DoubledGaugeField &Uds,
const GaugeField &Uthin,
const GaugeField &Ufat) {
conformable(Uds.Grid(), GaugeGrid);
conformable(Uthin.Grid(), GaugeGrid);
conformable(Ufat.Grid(), GaugeGrid);
GaugeLinkField U(GaugeGrid);
GaugeLinkField UU(GaugeGrid);
GaugeLinkField UUU(GaugeGrid);
GaugeLinkField Udag(GaugeGrid);
GaugeLinkField UUUdag(GaugeGrid);
for (int mu = 0; mu < Nd; mu++) {
// Staggered Phase.
Lattice<iScalar<vInteger> > coor(GaugeGrid);
Lattice<iScalar<vInteger> > x(GaugeGrid); LatticeCoordinate(x,0);
Lattice<iScalar<vInteger> > y(GaugeGrid); LatticeCoordinate(y,1);
Lattice<iScalar<vInteger> > z(GaugeGrid); LatticeCoordinate(z,2);
Lattice<iScalar<vInteger> > t(GaugeGrid); LatticeCoordinate(t,3);
Lattice<iScalar<vInteger> > lin_z(GaugeGrid); lin_z=x+y;
Lattice<iScalar<vInteger> > lin_t(GaugeGrid); lin_t=x+y+z;
ComplexField phases(GaugeGrid); phases=1.0;
if ( mu == 1 ) phases = where( mod(x ,2)==(Integer)0, phases,-phases);
if ( mu == 2 ) phases = where( mod(lin_z,2)==(Integer)0, phases,-phases);
if ( mu == 3 ) phases = where( mod(lin_t,2)==(Integer)0, phases,-phases);
// 1 hop based on fat links
U = PeekIndex<LorentzIndex>(Ufat, mu);
Udag = adj( Cshift(U, mu, -1));
U = U *phases;
Udag = Udag *phases;
InsertGaugeField(Uds,U,mu);
InsertGaugeField(Uds,Udag,mu+4);
// PokeIndex<LorentzIndex>(Uds, U, mu);
// PokeIndex<LorentzIndex>(Uds, Udag, mu + 4);
// 3 hop based on thin links. Crazy huh ?
U = PeekIndex<LorentzIndex>(Uthin, mu);
UU = Gimpl::CovShiftForward(U,mu,U);
UUU= Gimpl::CovShiftForward(U,mu,UU);
UUUdag = adj( Cshift(UUU, mu, -3));
UUU = UUU *phases;
UUUdag = UUUdag *phases;
InsertGaugeField(UUUds,UUU,mu);
InsertGaugeField(UUUds,UUUdag,mu+4);
}
}
inline void InsertForce4D(GaugeField &mat, FermionField &Btilde, FermionField &A,int mu){
GaugeLinkField link(mat.Grid());
link = TraceIndex<SpinIndex>(outerProduct(Btilde,A));
PokeIndex<LorentzIndex>(mat,link,mu);
}
inline void InsertForce5D(GaugeField &mat, FermionField &Btilde, FermionField &Atilde,int mu){
assert (0);
// Must never hit
}
};
typedef StaggeredImpl<vComplex, FundamentalRepresentation > StaggeredImplR; // Real.. whichever prec
typedef StaggeredImpl<vComplexF, FundamentalRepresentation > StaggeredImplF; // Float
typedef StaggeredImpl<vComplexD, FundamentalRepresentation > StaggeredImplD; // Double
NAMESPACE_END(Grid);