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Grid/lib/qcd/action/fermion/WilsonKernelsGpu.cc
paboyle 3a50afe7e7 GPU dslash updates
2018-06-27 22:32:21 +01:00

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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/action/fermion/WilsonKernelsGpu.cc
Copyright (C) 2018
Author: Peter Boyle <paboyle@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 */
#include <Grid/qcd/action/fermion/FermionCore.h>
NAMESPACE_BEGIN(Grid);
//////////////////////////////////////////////////////////////
// Gpu implementation; thread loop is implicit
//////////////////////////////////////////////////////////////
__host__ __device__ inline void synchronise(void)
{
#ifdef __CUDA_ARCH__
__syncthreads();
#endif
return;
}
__host__ __device__ inline int get_my_lanes(int Nsimd)
{
#ifdef __CUDA_ARCH__
return 1;
#else
return Nsimd;
#endif
}
__host__ __device__ inline int get_my_lane_offset(int Nsimd)
{
#ifdef __CUDA_ARCH__
return ( (threadIdx.x) % Nsimd);
#else
return 0;
#endif
}
////////////////////////////////////////////////////////////////////////
// Extract/Insert a single lane; do this locally in this file.
// Don't need a global version really.
////////////////////////////////////////////////////////////////////////
template<class vobj> accelerator_inline
typename vobj::scalar_object extractLaneGpu(int lane, const vobj & __restrict__ vec)
{
typedef typename vobj::scalar_object scalar_object;
typedef typename vobj::scalar_type scalar_type;
typedef typename vobj::vector_type vector_type;
constexpr int words=sizeof(vobj)/sizeof(vector_type);
constexpr int Nsimd=vector_type::Nsimd();
scalar_object extracted;
scalar_type * __restrict__ sp = (scalar_type *)&extracted; // Type pun
scalar_type * __restrict__ vp = (scalar_type *)&vec;
for(int w=0;w<words;w++){
sp[w]=vp[w*Nsimd+lane];
}
return extracted;
}
template<class vobj> accelerator_inline
void insertLaneFloat2(int lane, vobj & __restrict__ vec,const typename vobj::scalar_object & __restrict__ extracted)
{
typedef typename vobj::scalar_type scalar_type;
typedef typename vobj::vector_type vector_type;
constexpr int words=sizeof(vobj)/sizeof(vector_type);
constexpr int Nsimd=vector_type::Nsimd();
float2 * __restrict__ sp = (float2 *)&extracted;
float2 * __restrict__ vp = (float2 *)&vec;
for(int w=0;w<words;w++){
vp[w*Nsimd+lane]=sp[w];
}
}
template<class vobj> accelerator_inline
typename vobj::scalar_object extractLaneFloat2(int lane, const vobj & __restrict__ vec)
{
typedef typename vobj::scalar_object scalar_object;
typedef typename vobj::scalar_type scalar_type;
typedef typename vobj::vector_type vector_type;
constexpr int words=sizeof(vobj)/sizeof(vector_type);
constexpr int Nsimd=vector_type::Nsimd();
scalar_object extracted;
float2 * __restrict__ sp = (float2 *)&extracted; // Type pun
float2 * __restrict__ vp = (float2 *)&vec;
for(int w=0;w<words;w++){
sp[w]=vp[w*Nsimd+lane];
}
return extracted;
}
#define GPU_COALESCED_STENCIL_LEG_PROJ(Dir,spProj) \
if (SE->_is_local) { \
int mask = Nsimd >> (ptype + 1); \
int plane= lane; \
if (SE->_permute) plane = (lane ^ mask); \
auto in_l = extractLaneGpu(plane,in[SE->_offset]); \
spProj(chi,in_l); \
} else { \
chi = extractLaneGpu(lane,buf[SE->_offset]); \
}
template <class Impl>
accelerator void WilsonKernels<Impl>::GpuDhopSiteDag(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typename SiteHalfSpinor::scalar_object chi;
typename SiteHalfSpinor::scalar_object Uchi;
typename SiteSpinor::scalar_object result;
typedef typename SiteSpinor::scalar_type scalar_type;
typedef typename SiteSpinor::vector_type vector_type;
constexpr int Nsimd = sizeof(vector_type)/sizeof(scalar_type);
uint64_t lane_offset= get_my_lane_offset(Nsimd);
uint64_t lanes = get_my_lanes(Nsimd);
StencilEntry *SE;
int ptype;
for(int lane = lane_offset;lane<lane_offset+lanes;lane++){
for(int mu=0;mu<2*Nd;mu++) {
SE = st.GetEntry(ptype, mu, sF);
switch(mu){
case Xp:
GPU_COALESCED_STENCIL_LEG_PROJ(Xp,spProjXp); break;
case Yp:
GPU_COALESCED_STENCIL_LEG_PROJ(Yp,spProjYp); break;
case Zp:
GPU_COALESCED_STENCIL_LEG_PROJ(Zp,spProjZp); break;
case Tp:
GPU_COALESCED_STENCIL_LEG_PROJ(Tp,spProjTp); break;
case Xm:
GPU_COALESCED_STENCIL_LEG_PROJ(Xm,spProjXm); break;
case Ym:
GPU_COALESCED_STENCIL_LEG_PROJ(Ym,spProjYm); break;
case Zm:
GPU_COALESCED_STENCIL_LEG_PROJ(Zm,spProjZm); break;
case Tm:
default:
GPU_COALESCED_STENCIL_LEG_PROJ(Tm,spProjTm); break;
}
Impl::multLinkGpu(lane,Uchi,U[sU],chi,mu);
switch(mu){
case Xp:
spReconXp(result, Uchi); break;
case Yp:
accumReconYp(result, Uchi); break;
case Zp:
accumReconZp(result, Uchi); break;
case Tp:
accumReconTp(result, Uchi); break;
case Xm:
accumReconXm(result, Uchi); break;
case Ym:
accumReconYm(result, Uchi); break;
case Zm:
accumReconZm(result, Uchi); break;
case Tm:
default:
accumReconTm(result, Uchi); break;
}
}
insertLaneFloat2 (lane,out[sF],result);
}
}
template <class Impl>
accelerator void WilsonKernels<Impl>::GpuDhopSite(StencilView &st, DoubledGaugeFieldView &U,
SiteHalfSpinor *buf, int sF,
int sU, const FermionFieldView &in, FermionFieldView &out)
{
typename SiteHalfSpinor::scalar_object chi;
typename SiteHalfSpinor::scalar_object Uchi;
typename SiteSpinor::scalar_object result;
typedef typename SiteSpinor::scalar_type scalar_type;
typedef typename SiteSpinor::vector_type vector_type;
constexpr int Nsimd = sizeof(vector_type)/sizeof(scalar_type);
uint64_t lane_offset= get_my_lane_offset(Nsimd);
uint64_t lanes = get_my_lanes(Nsimd);
StencilEntry *SE;
int ptype;
for(int lane = lane_offset;lane<lane_offset+lanes;lane++){
#if 0
int mu=0;
SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Xp,spProjXm);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
spReconXm(result, Uchi);
mu++; SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Yp,spProjYm);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
accumReconYm(result, Uchi);
mu++; SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Zp,spProjZm);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
accumReconZm(result, Uchi);
mu++; SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Tp,spProjTm);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
accumReconTm(result, Uchi);
mu++; SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Xm,spProjXp);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
accumReconXp(result, Uchi);
mu++; SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Ym,spProjYp);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
accumReconYp(result, Uchi);
mu++; SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Zm,spProjZp);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
accumReconZp(result, Uchi);
mu++; SE = st.GetEntry(ptype, mu, sF);
GPU_COALESCED_STENCIL_LEG_PROJ(Tm,spProjTp);
{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
accumReconTp(result, Uchi);
#else
for(int mu=0;mu<2*Nd;mu++) {
SE = st.GetEntry(ptype, mu, sF);
switch(mu){
case Xp:
GPU_COALESCED_STENCIL_LEG_PROJ(Xp,spProjXm); break;
case Yp:
GPU_COALESCED_STENCIL_LEG_PROJ(Yp,spProjYm); break;
case Zp:
GPU_COALESCED_STENCIL_LEG_PROJ(Zp,spProjZm); break;
case Tp:
GPU_COALESCED_STENCIL_LEG_PROJ(Tp,spProjTm); break;
case Xm:
GPU_COALESCED_STENCIL_LEG_PROJ(Xm,spProjXp); break;
case Ym:
GPU_COALESCED_STENCIL_LEG_PROJ(Ym,spProjYp); break;
case Zm:
GPU_COALESCED_STENCIL_LEG_PROJ(Zm,spProjZp); break;
case Tm:
default:
GPU_COALESCED_STENCIL_LEG_PROJ(Tm,spProjTp); break;
}
Impl::multLinkGpu(lane,Uchi,U[sU],chi,mu);
switch(mu){
case Xp:
spReconXm(result, Uchi); break;
case Yp:
accumReconYm(result, Uchi); break;
case Zp:
accumReconZm(result, Uchi); break;
case Tp:
accumReconTm(result, Uchi); break;
case Xm:
accumReconXp(result, Uchi); break;
case Ym:
accumReconYp(result, Uchi); break;
case Zm:
accumReconZp(result, Uchi); break;
case Tm:
default:
accumReconTp(result, Uchi); break;
}
}
#endif
insertLaneFloat2 (lane,out[sF],result);
}
};
// Template specialise Gparity to empty for now
#define GPU_EMPTY(A) \
template <> \
accelerator void \
WilsonKernels<A>::GpuDhopSite(StencilView &st, \
DoubledGaugeFieldView &U, \
SiteHalfSpinor *buf, int sF, \
int sU, \
const FermionFieldView &in, \
FermionFieldView &out) { assert(0);}; \
template <> \
accelerator void \
WilsonKernels<A>::GpuDhopSiteDag(StencilView &st, \
DoubledGaugeFieldView &U, \
SiteHalfSpinor *buf, int sF, \
int sU, \
const FermionFieldView &in, \
FermionFieldView &out) { assert(0);};
GPU_EMPTY(GparityWilsonImplF);
GPU_EMPTY(GparityWilsonImplFH);
GPU_EMPTY(GparityWilsonImplD);
GPU_EMPTY(GparityWilsonImplDF);
/*
GPU_EMPTY(DomainWallVec5dImplF);
GPU_EMPTY(DomainWallVec5dImplFH);
GPU_EMPTY(DomainWallVec5dImplD);
GPU_EMPTY(DomainWallVec5dImplDF);
GPU_EMPTY(ZDomainWallVec5dImplF);
GPU_EMPTY(ZDomainWallVec5dImplFH);
GPU_EMPTY(ZDomainWallVec5dImplD);
GPU_EMPTY(ZDomainWallVec5dImplDF);
*/
FermOpTemplateInstantiate(WilsonKernels);
AdjointFermOpTemplateInstantiate(WilsonKernels);
TwoIndexFermOpTemplateInstantiate(WilsonKernels);
NAMESPACE_END(Grid);
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