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365 lines
11 KiB
C++
365 lines
11 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/action/fermion/WilsonKernelsGpu.cc
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Copyright (C) 2018
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution
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directory
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*************************************************************************************/
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/* END LEGAL */
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#include <Grid/qcd/action/fermion/FermionCore.h>
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NAMESPACE_BEGIN(Grid);
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//////////////////////////////////////////////////////////////
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// Gpu implementation; thread loop is implicit
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//////////////////////////////////////////////////////////////
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__host__ __device__ inline void synchronise(void)
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{
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#ifdef __CUDA_ARCH__
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__syncthreads();
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#endif
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return;
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}
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#define GPU_DSLASH_COALESCE
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#ifdef GPU_DSLASH_COALESCE
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__host__ __device__ inline int get_my_lanes(int Nsimd)
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{
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#ifdef __CUDA_ARCH__
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return 1;
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#else
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return Nsimd;
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#endif
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}
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__host__ __device__ inline int get_my_lane_offset(int Nsimd)
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{
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#ifdef __CUDA_ARCH__
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return ( (threadIdx.x) % Nsimd);
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#else
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return 0;
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#endif
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}
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////////////////////////////////////////////////////////////////////////
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// Extract/Insert a single lane; do this locally in this file.
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// Don't need a global version really.
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////////////////////////////////////////////////////////////////////////
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template<class vobj> accelerator_inline
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typename vobj::scalar_object extractLaneGpu(int lane, const vobj & __restrict__ vec)
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{
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typedef typename vobj::scalar_object scalar_object;
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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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constexpr int words=sizeof(vobj)/sizeof(vector_type);
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constexpr int Nsimd=vector_type::Nsimd();
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scalar_object extracted;
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scalar_type * __restrict__ sp = (scalar_type *)&extracted; // Type pun
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scalar_type * __restrict__ vp = (scalar_type *)&vec;
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for(int w=0;w<words;w++){
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sp[w]=vp[w*Nsimd+lane];
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}
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return extracted;
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}
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template<class vobj> accelerator_inline
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void insertLaneFloat2(int lane, vobj & __restrict__ vec,const typename vobj::scalar_object & __restrict__ extracted)
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{
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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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constexpr int words=sizeof(vobj)/sizeof(vector_type);
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constexpr int Nsimd=vector_type::Nsimd();
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float2 * __restrict__ sp = (float2 *)&extracted;
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float2 * __restrict__ vp = (float2 *)&vec;
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for(int w=0;w<words;w++){
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vp[w*Nsimd+lane]=sp[w];
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}
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}
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template<class vobj> accelerator_inline
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typename vobj::scalar_object extractLaneFloat2(int lane, const vobj & __restrict__ vec)
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{
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typedef typename vobj::scalar_object scalar_object;
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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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constexpr int words=sizeof(vobj)/sizeof(vector_type);
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constexpr int Nsimd=vector_type::Nsimd();
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scalar_object extracted;
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float2 * __restrict__ sp = (float2 *)&extracted; // Type pun
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float2 * __restrict__ vp = (float2 *)&vec;
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for(int w=0;w<words;w++){
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sp[w]=vp[w*Nsimd+lane];
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}
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return extracted;
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}
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#define GPU_COALESCED_STENCIL_LEG_PROJ(Dir,spProj) \
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if (SE->_is_local) { \
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auto in_l = extractLaneGpu(lane,in[SE->_offset]); \
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spProj(chi,in_l); \
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} else { \
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chi = extractLaneGpu(lane,buf[SE->_offset]); \
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}
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template <class Impl>
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accelerator void WilsonKernels<Impl>::GpuDhopSiteDag(StencilView &st, DoubledGaugeFieldView &U,
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SiteHalfSpinor *buf, int sF,int LLs,
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int sU, const FermionFieldView &in, FermionFieldView &out)
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{
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typename SiteHalfSpinor::scalar_object tmp;
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typename SiteHalfSpinor::scalar_object chi;
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typename SiteHalfSpinor::scalar_object Uchi;
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typename SiteSpinor::scalar_object result;
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typedef typename SiteSpinor::scalar_type scalar_type;
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typedef typename SiteSpinor::vector_type vector_type;
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constexpr int Nsimd = sizeof(vector_type)/sizeof(scalar_type);
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uint64_t lane_offset= get_my_lane_offset(Nsimd);
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uint64_t lanes = get_my_lanes (Nsimd);
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StencilEntry *SE;
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int ptype;
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for(int lane = lane_offset;lane<lane_offset+lanes;lane++){
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for(int s=0;s<LLs;s++){
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for(int mu=0;mu<2*Nd;mu++) {
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SE = st.GetEntry(ptype, mu, sF);
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switch(mu){
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case Xp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Xp,spProjXp); break;
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case Yp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Yp,spProjYp); break;
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case Zp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Zp,spProjZp); break;
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case Tp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Tp,spProjTp); break;
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case Xm:
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GPU_COALESCED_STENCIL_LEG_PROJ(Xm,spProjXm); break;
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case Ym:
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GPU_COALESCED_STENCIL_LEG_PROJ(Ym,spProjYm); break;
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case Zm:
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GPU_COALESCED_STENCIL_LEG_PROJ(Zm,spProjZm); break;
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case Tm:
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default:
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GPU_COALESCED_STENCIL_LEG_PROJ(Tm,spProjTm); break;
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}
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synchronise();
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auto U_l = extractLaneGpu(lane,U[sU](mu));
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Uchi()=U_l*chi();
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switch(mu){
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case Xp:
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spReconXp(result, Uchi); break;
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case Yp:
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accumReconYp(result, Uchi); break;
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case Zp:
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accumReconZp(result, Uchi); break;
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case Tp:
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accumReconTp(result, Uchi); break;
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case Xm:
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accumReconXm(result, Uchi); break;
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case Ym:
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accumReconYm(result, Uchi); break;
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case Zm:
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accumReconZm(result, Uchi); break;
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case Tm:
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default:
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accumReconTm(result, Uchi); break;
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}
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synchronise();
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}
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insertLane (lane,out[sF],result);
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sF++;
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}}
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};
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template <class Impl>
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accelerator void WilsonKernels<Impl>::GpuDhopSite(StencilView &st, DoubledGaugeFieldView &U,
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SiteHalfSpinor *buf, int sF,int LLs,
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int sU, const FermionFieldView &in, FermionFieldView &out)
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{
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typename SiteHalfSpinor::scalar_object tmp;
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typename SiteHalfSpinor::scalar_object chi;
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typename SiteHalfSpinor::scalar_object Uchi;
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typename SiteSpinor::scalar_object result;
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typedef typename SiteSpinor::scalar_type scalar_type;
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typedef typename SiteSpinor::vector_type vector_type;
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constexpr int Nsimd = sizeof(vector_type)/sizeof(scalar_type);
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uint64_t lane_offset= get_my_lane_offset(Nsimd);
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uint64_t lanes = get_my_lanes(Nsimd);
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// printf("Evaluating site %d Nsimd %d : lanes %ld %ld - %ld\n",sF,Nsimd,lanes,lane_offset,lane_offset+lanes-1);
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StencilEntry *SE;
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int ptype;
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for(int lane = lane_offset;lane<lane_offset+lanes;lane++){
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for(int s=0;s<LLs;s++){
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#if 1
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int mu=0;
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SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Xp,spProjXm);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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spReconXm(result, Uchi);
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mu++; SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Yp,spProjYm);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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accumReconYm(result, Uchi);
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mu++; SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Zp,spProjZm);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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accumReconZm(result, Uchi);
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mu++; SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Tp,spProjTm);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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accumReconTm(result, Uchi);
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mu++; SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Xm,spProjXp);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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accumReconXp(result, Uchi);
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mu++; SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Ym,spProjYp);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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accumReconYp(result, Uchi);
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mu++; SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Zm,spProjZp);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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accumReconZp(result, Uchi);
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mu++; SE = st.GetEntry(ptype, mu, sF);
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GPU_COALESCED_STENCIL_LEG_PROJ(Tm,spProjTp);
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{ auto U_l = extractLaneFloat2(lane,U[sU](mu)); Uchi() = U_l * chi();}
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accumReconTp(result, Uchi);
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#else
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for(int mu=0;mu<2*Nd;mu++) {
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SE = st.GetEntry(ptype, mu, sF);
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switch(mu){
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case Xp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Xp,spProjXm); break;
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case Yp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Yp,spProjYm); break;
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case Zp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Zp,spProjZm); break;
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case Tp:
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GPU_COALESCED_STENCIL_LEG_PROJ(Tp,spProjTm); break;
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case Xm:
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GPU_COALESCED_STENCIL_LEG_PROJ(Xm,spProjXp); break;
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case Ym:
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GPU_COALESCED_STENCIL_LEG_PROJ(Ym,spProjYp); break;
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case Zm:
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GPU_COALESCED_STENCIL_LEG_PROJ(Zm,spProjZp); break;
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case Tm:
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default:
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GPU_COALESCED_STENCIL_LEG_PROJ(Tm,spProjTp); break;
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}
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auto U_l = extractLaneGpu(lane,U[sU](mu));
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auto tmp = U_l * chi();
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Uchi() = tmp;
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switch(mu){
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case Xp:
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spReconXm(result, Uchi); break;
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case Yp:
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accumReconYm(result, Uchi); break;
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case Zp:
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accumReconZm(result, Uchi); break;
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case Tp:
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accumReconTm(result, Uchi); break;
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case Xm:
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accumReconXp(result, Uchi); break;
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case Ym:
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accumReconYp(result, Uchi); break;
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case Zm:
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accumReconZp(result, Uchi); break;
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case Tm:
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default:
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accumReconTp(result, Uchi); break;
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}
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}
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#endif
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insertLaneFloat2 (lane,out[sF],result);
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sF++;
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}}
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};
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// Template specialise Gparity to empty for now
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#define GPU_EMPTY(A) \
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template <> \
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accelerator void \
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WilsonKernels<A>::GpuDhopSite(StencilView &st, \
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DoubledGaugeFieldView &U, \
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SiteHalfSpinor *buf, int sF, int LLs, \
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int sU, \
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const FermionFieldView &in, \
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FermionFieldView &out) {}; \
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template <> \
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accelerator void \
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WilsonKernels<A>::GpuDhopSiteDag(StencilView &st, \
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DoubledGaugeFieldView &U, \
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SiteHalfSpinor *buf, int sF,int LLs, \
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int sU, \
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const FermionFieldView &in, \
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FermionFieldView &out) {};
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GPU_EMPTY(GparityWilsonImplF);
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GPU_EMPTY(GparityWilsonImplFH);
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GPU_EMPTY(GparityWilsonImplD);
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GPU_EMPTY(GparityWilsonImplDF);
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GPU_EMPTY(DomainWallVec5dImplF);
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GPU_EMPTY(DomainWallVec5dImplFH);
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GPU_EMPTY(DomainWallVec5dImplD);
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GPU_EMPTY(DomainWallVec5dImplDF);
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GPU_EMPTY(ZDomainWallVec5dImplF);
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GPU_EMPTY(ZDomainWallVec5dImplFH);
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GPU_EMPTY(ZDomainWallVec5dImplD);
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GPU_EMPTY(ZDomainWallVec5dImplDF);
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FermOpTemplateInstantiate(WilsonKernels);
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NAMESPACE_END(Grid);
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