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Commit 8c8c69af authored by James Willis's avatar James Willis
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Vectorised two inner loops.

parent 8758adf1
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src/runner_doiact_vec.c
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......@@ -225,6 +225,8 @@ __attribute__((always_inline)) INLINE static void storeInteractions(
(*icount)++;
}
}
#endif /* defined(HAVE_AVX2) || defined(HAVE_AVX512_F) */
/* Flush the c2 cache if it has reached capacity. */
if (*icount >= (C2_CACHE_SIZE - (NUM_VEC_PROC * VEC_SIZE))) {
......@@ -254,7 +256,6 @@ __attribute__((always_inline)) INLINE static void storeInteractions(
*icount = 0;
}
#endif /* defined(HAVE_AVX2) || defined(HAVE_AVX512_F) */
}
#endif /* WITH_VECTORIZATION */
......@@ -882,13 +883,7 @@ void runner_dopair1_density_vec(struct runner *r, struct cell *ci, struct cell *
struct c2_cache int_cache;
int num_vec_proc = 1;
vector v_hi, v_vix, v_viy, v_viz, v_hig2;//, v_r2;
float r2q[VEC_SIZE] __attribute__((aligned(16)));
float hiq[VEC_SIZE] __attribute__((aligned(16)));
float hjq[VEC_SIZE] __attribute__((aligned(16)));
float dxq[3 * VEC_SIZE] __attribute__((aligned(16)));
struct part *piq[VEC_SIZE], *pjq[VEC_SIZE];
vector v_hi, v_vix, v_viy, v_viz, v_hig2;
TIMER_TIC;
......@@ -949,8 +944,7 @@ void runner_dopair1_density_vec(struct runner *r, struct cell *ci, struct cell *
struct part *restrict pi = &parts_i[sort_i[pid].i];
if (!part_is_active(pi, e)) continue;
//int ci_cache_idx = sort_i[pid].i;
int ci_cache_idx = pid;
int ci_cache_idx = pid; //sort_i[pid].i;
const float hi = ci_cache->h[ci_cache_idx];
const double di = sort_i[pid].d + hi * kernel_gamma + dx_max - rshift;
......@@ -1017,8 +1011,7 @@ void runner_dopair1_density_vec(struct runner *r, struct cell *ci, struct cell *
for (int pjd = 0; pjd < exit_iteration_align; pjd += VEC_SIZE) {
/* Get the cache index to the jth particle. */
//int cj_cache_idx = sort_j[pjd].i;
int cj_cache_idx = pjd;
int cj_cache_idx = pjd; //sort_j[pjd].i;
vector v_dx, v_dy, v_dz, v_r2;
......@@ -1117,67 +1110,167 @@ void runner_dopair1_density_vec(struct runner *r, struct cell *ci, struct cell *
/* Get a hold of the jth part in cj. */
struct part *restrict pj = &parts_j[sort_j[pjd].i];
if (!part_is_active(pj, e)) continue;
const float hj = pj->h;
int cj_cache_idx = pjd;
const float hj = cj_cache.h[cj_cache_idx];
const double dj = sort_j[pjd].d - hj * kernel_gamma - dx_max - rshift;
if (dj > di_max) continue;
double pjx[3];
for (int k = 0; k < 3; k++) pjx[k] = pj->x[k] + shift[k];
const float hjg2 = hj * hj * kernel_gamma2;
/* Loop over the parts in ci. */
for (int pid = count_i - 1; pid >= 0 && sort_i[pid].d > dj; pid--) {
vector pjx, pjy, pjz;
vector v_hj, v_vjx, v_vjy, v_vjz, v_hjg2;
/* Get a pointer to the jth particle. */
struct part *restrict pi = &parts_i[sort_i[pid].i];
/* Fill particle pi vectors. */
pjx.v = vec_set1(cj_cache.x[cj_cache_idx]);
pjy.v = vec_set1(cj_cache.y[cj_cache_idx]);
pjz.v = vec_set1(cj_cache.z[cj_cache_idx]);
v_hj.v = vec_set1(hj);
v_vjx.v = vec_set1(cj_cache.vx[cj_cache_idx]);
v_vjy.v = vec_set1(cj_cache.vy[cj_cache_idx]);
v_vjz.v = vec_set1(cj_cache.vz[cj_cache_idx]);
/* Compute the pairwise distance. */
float r2 = 0.0f;
float dx[3];
for (int k = 0; k < 3; k++) {
dx[k] = pjx[k] - pi->x[k];
r2 += dx[k] * dx[k];
}
v_hjg2.v = vec_set1(hjg2);
/* Hit or miss? */
if (r2 < hjg2) {
/* Reset cumulative sums of update vectors. */
vector rhoSum, rho_dhSum, wcountSum, wcount_dhSum, div_vSum, curlvxSum,
curlvySum, curlvzSum;
#ifndef WITH_VECTORIZATION
/* Get the inverse of hj. */
vector v_hj_inv;
runner_iact_nonsym_density(r2, dx, hj, pi->h, pj, pi);
v_hj_inv = vec_reciprocal(v_hj);
#else
rhoSum.v = vec_setzero();
rho_dhSum.v = vec_setzero();
wcountSum.v = vec_setzero();
wcount_dhSum.v = vec_setzero();
div_vSum.v = vec_setzero();
curlvxSum.v = vec_setzero();
curlvySum.v = vec_setzero();
curlvzSum.v = vec_setzero();
/* Add this interaction to the queue. */
r2q[icount] = r2;
dxq[3 * icount + 0] = dx[0];
dxq[3 * icount + 1] = dx[1];
dxq[3 * icount + 2] = dx[2];
hiq[icount] = hj;
hjq[icount] = pi->h;
piq[icount] = pj;
pjq[icount] = pi;
icount += 1;
/* Flush? */
if (icount == VEC_SIZE) {
runner_iact_nonsym_vec_density(r2q, dxq, hiq, hjq, piq, pjq);
icount = 0;
}
int exit_iteration = 0;
for (int pid = count_i - 1; pid >= 0; pid--) {
if(sort_i[pid].d <= dj) exit_iteration = pid;
}
#endif
/* Pad cache if there is a serial remainder. */
int exit_iteration_align = exit_iteration;
int rem = exit_iteration % (num_vec_proc * VEC_SIZE);
if (rem != 0) {
int pad = (num_vec_proc * VEC_SIZE) - rem;
exit_iteration_align -= pad;
/* Set positions to the same as particle pi so when the r2 > 0 mask is
* applied these extra contributions are masked out.*/
for (int i = exit_iteration; i >= exit_iteration_align; i--) {
ci_cache->x[i] = pjx.f[0];
ci_cache->y[i] = pjy.f[0];
ci_cache->z[i] = pjz.f[0];
}
}
vector pix, piy, piz;
vector pivx, pivy, pivz, mi;
/* Loop over the parts in ci. */
//for (int pid = count_i - 1; pid >= 0 && sort_i[pid].d > dj; pid--) {
for (int pid = count_i - 1; pid >= 0; pid -= VEC_SIZE) {
/* Get the cache index to the ith particle. */
int ci_cache_idx = pid; //sort_i[pid].i;
vector v_dx, v_dy, v_dz, v_r2;
/* Load 2 sets of vectors from the particle cache. */
pix.v = vec_load(&ci_cache->x[ci_cache_idx]);
piy.v = vec_load(&ci_cache->y[ci_cache_idx]);
piz.v = vec_load(&ci_cache->z[ci_cache_idx]);
pivx.v = vec_load(&ci_cache->vx[ci_cache_idx]);
pivy.v = vec_load(&ci_cache->vy[ci_cache_idx]);
pivz.v = vec_load(&ci_cache->vz[ci_cache_idx]);
mi.v = vec_load(&ci_cache->m[ci_cache_idx]);
/* Compute the pairwise distance. */
v_dx.v = vec_sub(pjx.v, pix.v);
v_dy.v = vec_sub(pjy.v, piy.v);
v_dz.v = vec_sub(pjz.v, piz.v);
v_r2.v = vec_mul(v_dx.v, v_dx.v);
v_r2.v = vec_fma(v_dy.v, v_dy.v, v_r2.v);
v_r2.v = vec_fma(v_dz.v, v_dz.v, v_r2.v);
vector v_doj_mask, v_doj_mask_check;
int doj_mask;
/* Form r2 > 0 mask and r2 < hig2 mask. */
v_doj_mask_check.v = vec_cmp_gt(v_r2.v, vec_setzero());
v_doj_mask.v = vec_cmp_lt(v_r2.v, v_hjg2.v);
/* Combine two masks and form integer mask. */
doj_mask = vec_cmp_result(vec_and(v_doj_mask.v, v_doj_mask_check.v));
/* If there are any interactions left pack interaction values into c2
* cache. */
if (doj_mask)
storeInteractions(doj_mask, ci_cache_idx, &v_r2, &v_dx, &v_dy, &v_dz,
&mi, &pivx, &pivy, &pivz, ci_cache, &int_cache,
&icount, &rhoSum, &rho_dhSum, &wcountSum,
&wcount_dhSum, &div_vSum, &curlvxSum, &curlvySum,
&curlvzSum, v_hj_inv, v_vjx, v_vjy, v_vjz);
} /* loop over the parts in cj. */
} /* loop over the parts in ci. */
/* Perform padded vector remainder interactions if any are present. */
calcRemInteractions(&int_cache, icount, &rhoSum, &rho_dhSum,
&wcountSum, &wcount_dhSum, &div_vSum, &curlvxSum,
&curlvySum, &curlvzSum, v_hj_inv, v_vjx, v_vjy, v_vjz,
&icount_align);
/* Initialise masks to true in case remainder interactions have been
* performed. */
vector int_mask, int_mask2;
#ifdef HAVE_AVX512_F
KNL_MASK_16 knl_mask = 0xFFFF;
KNL_MASK_16 knl_mask2 = 0xFFFF;
int_mask.m = vec_setint1(0xFFFFFFFF);
int_mask2.m = vec_setint1(0xFFFFFFFF);
#else
int_mask.m = vec_setint1(0xFFFFFFFF);
int_mask2.m = vec_setint1(0xFFFFFFFF);
#endif
#ifdef WITH_VECTORIZATION
/* Pick up any leftovers. */
if (icount > 0)
for (int k = 0; k < icount; k++)
runner_iact_nonsym_density(r2q[k], &dxq[3 * k], hiq[k], hjq[k], piq[k], pjq[k]);
/* Perform interaction with 2 vectors. */
for (int pjd = 0; pjd < icount_align; pjd += (NUM_VEC_PROC * VEC_SIZE)) {
runner_iact_nonsym_2_vec_density(
&int_cache.r2q[pjd], &int_cache.dxq[pjd], &int_cache.dyq[pjd],
&int_cache.dzq[pjd], v_hj_inv, v_vjx, v_vjy, v_vjz,
&int_cache.vxq[pjd], &int_cache.vyq[pjd], &int_cache.vzq[pjd],
&int_cache.mq[pjd], &rhoSum, &rho_dhSum, &wcountSum, &wcount_dhSum,
&div_vSum, &curlvxSum, &curlvySum, &curlvzSum, int_mask, int_mask2,
#ifdef HAVE_AVX512_F
knl_mask, knl_mask2);
#else
0, 0);
#endif
}
/* Perform horizontal adds on vector sums and store result in particle pi.
*/
VEC_HADD(rhoSum, pj->rho);
VEC_HADD(rho_dhSum, pj->density.rho_dh);
VEC_HADD(wcountSum, pj->density.wcount);
VEC_HADD(wcount_dhSum, pj->density.wcount_dh);
VEC_HADD(div_vSum, pj->density.div_v);
VEC_HADD(curlvxSum, pj->density.rot_v[0]);
VEC_HADD(curlvySum, pj->density.rot_v[1]);
VEC_HADD(curlvzSum, pj->density.rot_v[2]);
icount = 0;
} /* loop over the parts in ci. */
TIMER_TOC(timer_dopair_density);
......
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