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Faster derivative for WilsonGauge

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This commit is contained in:
Guido Cossu
2017-05-26 14:31:49 +01:00
parent ffb91e53d2
commit 0de314870d
2 changed files with 37 additions and 22 deletions
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47
lib/qcd/utils/WilsonLoops.h
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@@ -188,13 +188,10 @@ public:
}
}
//////////////////////////////////////////////////
// the sum over all staples on each site
//////////////////////////////////////////////////
static void Staple(GaugeMat &staple, const GaugeLorentz &Umu, int mu) {
// For the force term
static void StapleMult(GaugeMat &staple, const GaugeLorentz &Umu, int mu) {
GridBase *grid = Umu._grid;
std::vector<GaugeMat> U(Nd, grid);
for (int d = 0; d < Nd; d++) {
// this operation is taking too much time
@@ -204,6 +201,31 @@ public:
GaugeMat tmp1(grid);
GaugeMat tmp2(grid);
for (int nu = 0; nu < Nd; nu++) {
if (nu != mu) {
// this is ~10% faster than the Staple
tmp1 = Cshift(U[nu], mu, 1);
tmp2 = Cshift(U[mu], nu, 1);
staple += tmp1* adj(U[nu]*tmp2);
tmp2 = adj(U[mu]*tmp1)*U[nu];
staple += Cshift(tmp2, nu, -1);
}
}
staple = U[mu]*staple;
}
//////////////////////////////////////////////////
// the sum over all staples on each site
//////////////////////////////////////////////////
static void Staple(GaugeMat &staple, const GaugeLorentz &Umu, int mu) {
GridBase *grid = Umu._grid;
std::vector<GaugeMat> U(Nd, grid);
for (int d = 0; d < Nd; d++) {
U[d] = PeekIndex<LorentzIndex>(Umu, d);
}
staple = zero;
for (int nu = 0; nu < Nd; nu++) {
@@ -217,34 +239,23 @@ public:
// |
// __|
//
tmp1 = Cshift(U[nu], mu, 1);
tmp2 = Cshift(U[mu], nu, 1);
staple += tmp1*adj(U[nu] * tmp2);
/*
staple += Gimpl::ShiftStaple(
Gimpl::CovShiftForward(
U[nu], nu,
Gimpl::CovShiftBackward(
U[mu], mu, Gimpl::CovShiftIdentityBackward(U[nu], nu))),
mu);
*/
// __
// |
// |__
//
//
tmp2 = adj(U[mu]*tmp1)*U[nu];
staple += Cshift(tmp2, nu, -1);
/*
staple += Gimpl::ShiftStaple(
Gimpl::CovShiftBackward(U[nu], nu,
Gimpl::CovShiftBackward(U[mu], mu, U[nu])), mu);
*/
}
}
}