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fix 3-link stencil

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This commit is contained in:
david clarke 2023-06-07 21:14:58 -06:00
parent 3825329f8e
commit ab56ad8d7a
1 changed files with 39 additions and 12 deletions
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51
tests/smearing/Test_fatLinks.cc
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@ -12,7 +12,7 @@
#include <Grid/stencil/GeneralLocalStencil.h>
using namespace Grid;
// This is to optimize the SIMD
// This is to optimize the SIMD (will also need to be in the class, at least for now)
template<class vobj> void gpermute(vobj & inout,int perm) {
vobj tmp=inout;
if (perm & 0x1) {permute(inout,tmp,0); tmp=inout;}
@ -81,19 +81,27 @@ int main (int argc, char **argv)
// This is where the 3-link constructs will be stored
LatticeGaugeField Ughost_3link(Ughost.Grid());
// Create 3-link stencil
// Create 3-link stencil (class will build its own stencils)
// writing your own stencil, you're hard-coding the periodic BCs, so you don't need
// the policy-based stuff, at least for now
std::vector<Coordinate> shifts;
for(int mu=0;mu<Nd;mu++){
for(int nu=mu+1;nu<Nd;nu++){
// forward shifts
Coordinate shift_0(Nd,0);
Coordinate shift_mu(Nd,0); shift_mu[mu]=1;
Coordinate shift_nu(Nd,0); shift_nu[nu]=1;
// push_back creates an element at the end of shifts and
// assigns the data in the argument to it.
shifts.push_back(shift_0);
shifts.push_back(shift_mu);
shifts.push_back(shift_nu);
shifts.push_back(shift_0);
// reverse shifts
shift_nu[nu]=-1;
Coordinate shift_munu(Nd,0); shift_munu[mu]=1; shift_munu[nu]=-1;
shifts.push_back(shift_munu);
shifts.push_back(shift_nu);
shifts.push_back(shift_nu);
}
}
GeneralLocalStencil gStencil(GhostGrid,shifts);
@ -104,7 +112,7 @@ int main (int argc, char **argv)
autoView(U_v , Ughost , CpuRead);
autoView(U_3link_v, Ughost_3link, CpuWrite);
// This is a loop over local sites.
// This is a loop over local sites. TODO: get backwards directions
for(int ss=0;ss<U_v.size();ss++){
// This is the stencil index. It increases as we make our way through the spacetime sites,
@ -114,33 +122,52 @@ int main (int argc, char **argv)
for(int mu=0;mu<Nd;mu++){
for(int nu=mu+1;nu<Nd;nu++){
// shift_mu; shift_mu[mu]=1
// shift_nu; shift_nu[nu]=1
// shift_0
// shift_munu; shift_munu[mu]= 1; shift_munu[nu]=-1;
// shift_nu ; shift_nu[nu]=-1;
// shift_nu ; shift_nu[nu]=-1;
auto SE0 = gStencil.GetEntry(s+0,ss);
auto SE1 = gStencil.GetEntry(s+1,ss);
auto SE2 = gStencil.GetEntry(s+2,ss);
auto SE3 = gStencil.GetEntry(s+3,ss);
auto SE4 = gStencil.GetEntry(s+4,ss);
auto SE5 = gStencil.GetEntry(s+5,ss);
// Each offset corresponds to a site around the plaquette.
int o0 = SE0->_offset;
int o1 = SE1->_offset;
int o2 = SE2->_offset;
int o3 = SE3->_offset;
int o4 = SE4->_offset;
int o5 = SE5->_offset;
auto U0 = U_v[o0](mu);
auto U1 = U_v[o1](nu);
auto U2 = adj(U_v[o2](mu));
auto U3 = adj(U_v[o3](nu));
auto U0 = U_v[o0](nu);
auto U1 = adj(U_v[o1](mu));
auto U2 = adj(U_v[o2](nu));
gpermute(U0,SE0->_permute);
gpermute(U1,SE1->_permute);
gpermute(U2,SE2->_permute);
auto U3 = adj(U_v[o3](nu));
auto U4 = adj(U_v[o4](mu));
auto U5 = U_v[o5](nu);
gpermute(U3,SE3->_permute);
gpermute(U4,SE4->_permute);
gpermute(U5,SE5->_permute);
auto W = U1*U2*U3;
// We add together contributions coming from each orientation.
// Forward contribution from this orientation
auto W = U0*U1*U2;
U_3link_v[ss](mu) = U_3link_v[ss](mu) + W;
s=s+4;
// Backward contribution from this orientation
W = U3*U4*U5;
U_3link_v[ss](mu) = U_3link_v[ss](mu) + W;
s=s+6;
}
}
}