forked from lijiext/lammps
287 lines
9.6 KiB
Plaintext
287 lines
9.6 KiB
Plaintext
// **************************************************************************
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// charmm_long.cu
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// -------------------
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// W. Michael Brown (ORNL)
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//
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// Device code for acceleration of the charmm/coul/long pair style
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//
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// __________________________________________________________________________
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// This file is part of the LAMMPS Accelerator Library (LAMMPS_AL)
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// __________________________________________________________________________
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//
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// begin :
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// email : brownw@ornl.gov
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// ***************************************************************************/
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#ifdef NV_KERNEL
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#include "lal_aux_fun1.h"
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#ifndef _DOUBLE_DOUBLE
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texture<float4> pos_tex;
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texture<float> q_tex;
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#else
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texture<int4,1> pos_tex;
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texture<int2> q_tex;
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#endif
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#else
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#define pos_tex x_
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#define q_tex q_
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#endif
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__kernel void k_charmm_long(const __global numtyp4 *restrict x_,
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const __global numtyp4 *restrict lj1,
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const int lj_types,
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const __global numtyp *restrict sp_lj,
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const __global int *dev_nbor,
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const __global int *dev_packed,
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__global acctyp4 *restrict ans,
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__global acctyp *restrict engv,
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const int eflag, const int vflag, const int inum,
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const int nbor_pitch,
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const __global numtyp *restrict q_,
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const numtyp cut_coulsq, const numtyp qqrd2e,
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const numtyp g_ewald, const numtyp denom_lj,
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const numtyp cut_bothsq, const numtyp cut_ljsq,
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const numtyp cut_lj_innersq, const int t_per_atom) {
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int tid, ii, offset;
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atom_info(t_per_atom,ii,tid,offset);
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acctyp energy=(acctyp)0;
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acctyp e_coul=(acctyp)0;
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acctyp4 f;
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f.x=(acctyp)0; f.y=(acctyp)0; f.z=(acctyp)0;
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acctyp virial[6];
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for (int i=0; i<6; i++)
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virial[i]=(acctyp)0;
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if (ii<inum) {
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int nbor, nbor_end;
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int i, numj;
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__local int n_stride;
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nbor_info(dev_nbor,dev_packed,nbor_pitch,t_per_atom,ii,offset,i,numj,
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n_stride,nbor_end,nbor);
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numtyp4 ix; fetch4(ix,i,pos_tex); //x_[i];
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numtyp qtmp; fetch(qtmp,i,q_tex);
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int itype=ix.w;
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for ( ; nbor<nbor_end; nbor+=n_stride) {
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int j=dev_packed[nbor];
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numtyp factor_lj, factor_coul;
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factor_lj = sp_lj[sbmask(j)];
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factor_coul = (numtyp)1.0-sp_lj[sbmask(j)+4];
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j &= NEIGHMASK;
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numtyp4 jx; fetch4(jx,j,pos_tex); //x_[j];
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int jtype=jx.w;
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// Compute r12
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numtyp delx = ix.x-jx.x;
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numtyp dely = ix.y-jx.y;
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numtyp delz = ix.z-jx.z;
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numtyp rsq = delx*delx+dely*dely+delz*delz;
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int mtype=itype*lj_types+jtype;
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if (rsq<cut_bothsq) {
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numtyp r2inv=ucl_recip(rsq);
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numtyp forcecoul, force_lj, force, r6inv, prefactor, _erfc, switch1;
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if (rsq < cut_ljsq) {
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r6inv = r2inv*r2inv*r2inv;
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force_lj = factor_lj*r6inv*(lj1[mtype].x*r6inv-lj1[mtype].y);
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if (rsq > cut_lj_innersq) {
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switch1 = (cut_ljsq-rsq);
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numtyp switch2 = (numtyp)12.0*rsq*switch1*(rsq-cut_lj_innersq)/
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denom_lj;
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switch1 *= switch1;
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switch1 *= (cut_ljsq+(numtyp)2.0*rsq-(numtyp)3.0*cut_lj_innersq)/
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denom_lj;
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switch2 *= r6inv*(lj1[mtype].z*r6inv-lj1[mtype].w);
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force_lj = force_lj*switch1+switch2;
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}
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} else
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force_lj = (numtyp)0.0;
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if (rsq < cut_coulsq) {
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numtyp r = ucl_rsqrt(r2inv);
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numtyp grij = g_ewald * r;
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numtyp expm2 = ucl_exp(-grij*grij);
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numtyp t = ucl_recip((numtyp)1.0 + EWALD_P*grij);
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_erfc = t * (A1+t*(A2+t*(A3+t*(A4+t*A5)))) * expm2;
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fetch(prefactor,j,q_tex);
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prefactor *= qqrd2e * qtmp/r;
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forcecoul = prefactor * (_erfc + EWALD_F*grij*expm2-factor_coul);
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} else
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forcecoul = (numtyp)0.0;
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force = (force_lj + forcecoul) * r2inv;
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f.x+=delx*force;
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f.y+=dely*force;
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f.z+=delz*force;
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if (eflag>0) {
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if (rsq < cut_coulsq)
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e_coul += prefactor*(_erfc-factor_coul);
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if (rsq < cut_ljsq) {
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numtyp e=r6inv*(lj1[mtype].z*r6inv-lj1[mtype].w);
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if (rsq > cut_lj_innersq)
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e *= switch1;
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energy+=factor_lj*e;
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}
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}
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if (vflag>0) {
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virial[0] += delx*delx*force;
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virial[1] += dely*dely*force;
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virial[2] += delz*delz*force;
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virial[3] += delx*dely*force;
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virial[4] += delx*delz*force;
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virial[5] += dely*delz*force;
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}
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}
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} // for nbor
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store_answers_q(f,energy,e_coul,virial,ii,inum,tid,t_per_atom,offset,eflag,
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vflag,ans,engv);
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} // if ii
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}
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__kernel void k_charmm_long_fast(const __global numtyp4 *restrict x_,
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const __global numtyp2 *restrict ljd_in,
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const __global numtyp *restrict sp_lj_in,
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const __global int *dev_nbor,
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const __global int *dev_packed,
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__global acctyp4 *restrict ans,
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__global acctyp *restrict engv,
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const int eflag, const int vflag,
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const int inum, const int nbor_pitch,
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const __global numtyp *restrict q_,
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const numtyp cut_coulsq, const numtyp qqrd2e,
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const numtyp g_ewald, const numtyp denom_lj,
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const numtyp cut_bothsq, const numtyp cut_ljsq,
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const numtyp cut_lj_innersq,
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const int t_per_atom) {
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int tid, ii, offset;
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atom_info(t_per_atom,ii,tid,offset);
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__local numtyp2 ljd[MAX_BIO_SHARED_TYPES];
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__local numtyp sp_lj[8];
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if (tid<8)
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sp_lj[tid]=sp_lj_in[tid];
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if (tid<MAX_BIO_SHARED_TYPES)
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ljd[tid]=ljd_in[tid];
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if (tid+BLOCK_BIO_PAIR<MAX_BIO_SHARED_TYPES)
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ljd[tid+BLOCK_BIO_PAIR]=ljd_in[tid+BLOCK_BIO_PAIR];
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acctyp energy=(acctyp)0;
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acctyp e_coul=(acctyp)0;
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acctyp4 f;
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f.x=(acctyp)0; f.y=(acctyp)0; f.z=(acctyp)0;
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acctyp virial[6];
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for (int i=0; i<6; i++)
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virial[i]=(acctyp)0;
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__syncthreads();
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if (ii<inum) {
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int nbor, nbor_end;
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int i, numj;
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__local int n_stride;
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nbor_info(dev_nbor,dev_packed,nbor_pitch,t_per_atom,ii,offset,i,numj,
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n_stride,nbor_end,nbor);
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numtyp4 ix; fetch4(ix,i,pos_tex); //x_[i];
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numtyp qtmp; fetch(qtmp,i,q_tex);
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int itype=ix.w;
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for ( ; nbor<nbor_end; nbor+=n_stride) {
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int j=dev_packed[nbor];
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numtyp factor_lj, factor_coul;
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factor_lj = sp_lj[sbmask(j)];
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factor_coul = (numtyp)1.0-sp_lj[sbmask(j)+4];
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j &= NEIGHMASK;
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numtyp4 jx; fetch4(jx,j,pos_tex); //x_[j];
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int jtype=jx.w;
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// Compute r12
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numtyp delx = ix.x-jx.x;
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numtyp dely = ix.y-jx.y;
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numtyp delz = ix.z-jx.z;
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numtyp rsq = delx*delx+dely*dely+delz*delz;
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if (rsq<cut_bothsq) {
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numtyp r2inv=ucl_recip(rsq);
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numtyp forcecoul, force_lj, force, prefactor, _erfc, switch1;
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numtyp lj3, lj4;
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if (rsq < cut_ljsq) {
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numtyp eps = ucl_sqrt(ljd[itype].x*ljd[jtype].x);
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numtyp sig6 = (numtyp)0.5 * (ljd[itype].y+ljd[jtype].y);
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numtyp sig_r_6 = sig6*sig6*r2inv;
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sig_r_6 = sig_r_6*sig_r_6*sig_r_6;
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lj4 = (numtyp)4.0*eps*sig_r_6;
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lj3 = lj4*sig_r_6;
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force_lj = factor_lj*((numtyp)12.0 * lj3 - (numtyp)6.0 * lj4);
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if (rsq > cut_lj_innersq) {
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switch1 = (cut_ljsq-rsq);
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numtyp switch2 = (numtyp)12.0*rsq*switch1*(rsq-cut_lj_innersq)/
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denom_lj;
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switch1 *= switch1;
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switch1 *= (cut_ljsq+(numtyp)2.0*rsq-(numtyp)3.0*cut_lj_innersq)/
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denom_lj;
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switch2 *= lj3-lj4;
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force_lj = force_lj*switch1+switch2;
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}
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} else
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force_lj = (numtyp)0.0;
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if (rsq < cut_coulsq) {
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numtyp r = ucl_rsqrt(r2inv);
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numtyp grij = g_ewald * r;
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numtyp expm2 = ucl_exp(-grij*grij);
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numtyp t = ucl_recip((numtyp)1.0 + EWALD_P*grij);
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_erfc = t * (A1+t*(A2+t*(A3+t*(A4+t*A5)))) * expm2;
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fetch(prefactor,j,q_tex);
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prefactor *= qqrd2e * qtmp/r;
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forcecoul = prefactor * (_erfc + EWALD_F*grij*expm2-factor_coul);
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} else
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forcecoul = (numtyp)0.0;
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force = (force_lj + forcecoul) * r2inv;
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f.x+=delx*force;
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f.y+=dely*force;
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f.z+=delz*force;
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if (eflag>0) {
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if (rsq < cut_coulsq)
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e_coul += prefactor*(_erfc-factor_coul);
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if (rsq < cut_ljsq) {
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numtyp e=lj3-lj4;
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if (rsq > cut_lj_innersq)
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e *= switch1;
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energy+=factor_lj*e;
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}
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}
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if (vflag>0) {
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virial[0] += delx*delx*force;
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virial[1] += dely*dely*force;
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virial[2] += delz*delz*force;
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virial[3] += delx*dely*force;
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virial[4] += delx*delz*force;
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virial[5] += dely*delz*force;
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}
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}
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} // for nbor
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store_answers_q(f,energy,e_coul,virial,ii,inum,tid,t_per_atom,offset,eflag,
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vflag,ans,engv);
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} // if ii
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}
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