#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include "hnum_pssp_defs.h"
namespace harlinn
{
namespace numerics
{
namespace SuperLU
{
namespace Single
{
void
psgstrf_bmod1D(
const int pnum, /* process number */
const int m, /* number of rows in the matrix */
const int w, /* current panel width */
const int jcol, /* leading column of the current panel */
const int fsupc, /* leading column of the updating supernode */
const int krep, /* last column of the updating supernode */
const int nsupc, /* number of columns in the updating s-node */
int nsupr, /* number of rows in the updating supernode */
int nrow, /* number of rows below the diagonal block of
the updating supernode */
int *repfnz, /* in */
int *panel_lsub, /* modified */
int *w_lsub_end, /* modified */
int *spa_marker, /* modified; size n-by-w */
float *dense, /* modified */
float *tempv, /* working array - zeros on entry/exit */
GlobalLU_t *Glu, /* modified */
Gstat_t *Gstat /* modified */
)
{
/*
* -- SuperLU MT routine (version 2.0) --
* Lawrence Berkeley National Lab, Univ. of California Berkeley,
* and Xerox Palo Alto Research Center.
* September 10, 2007
*
* Purpose
* =======
*
* Performs numeric block updates (sup-panel) in topological order.
* It features: col-col, 2cols-col, 3cols-col, and sup-col updates.
* Results are returned in SPA dense[*,w].
*
*/
#if ( MACH==CRAY_PVP )
_fcd ftcs1 = _cptofcd("L", strlen("L")),
ftcs2 = _cptofcd("N", strlen("N")),
ftcs3 = _cptofcd("U", strlen("U"));
#endif
#ifdef USE_VENDOR_BLAS
int incx = 1, incy = 1;
float alpha, beta;
#endif
float ukj, ukj1, ukj2;
int luptr, luptr1, luptr2;
int segsze;
register int lptr; /* start of row subscripts of the updating supernode */
register int i, krep_ind, kfnz, isub, irow, no_zeros;
register int jj; /* index through each column in the panel */
int *repfnz_col; /* repfnz[] for a column in the panel */
float *dense_col; /* dense[] for a column in the panel */
float *tempv1; /* used to store matrix-vector result */
int *col_marker; /* each column of the spa_marker[*,w] */
int *col_lsub; /* each column of the panel_lsub[*,w] */
int *lsub, *xlsub_end;
float *lusup;
int *xlusup;
register float flopcnt;
float zero = 0.0;
float one = 1.0;
#ifdef TIMING
double *utime = Gstat->utime;
double f_time;
#endif
lsub = Glu->lsub;
xlsub_end = Glu->xlsub_end;
lusup = Glu->lusup;
xlusup = Glu->xlusup;
lptr = Glu->xlsub[fsupc];
krep_ind = lptr + nsupc - 1;
/* Pointers to each column of the w-wide arrays. */
repfnz_col= repfnz;
dense_col = dense;
col_marker= spa_marker;
col_lsub = panel_lsub;
#if ( DEBUGlevel>=2 )
if (jcol == BADPAN && krep == BADREP) {
printf("(%d) psgstrf_bmod1D[1] jcol %d, fsupc %d, krep %d, nsupc %d, nsupr %d, nrow %d\n",
pnum, jcol, fsupc, krep, nsupc, nsupr, nrow);
PrintInt10("lsub[xlsub[2774]]", nsupr, &lsub[lptr]);
}
#endif
/*
* Sequence through each column in the panel ...
*/
for (jj = jcol; jj < jcol + w; ++jj, col_marker += m, col_lsub += m,
repfnz_col += m, dense_col += m) {
kfnz = repfnz_col[krep];
if ( kfnz == EMPTY ) continue; /* Skip any zero segment */
segsze = krep - kfnz + 1;
luptr = xlusup[fsupc];
/* Calculate flops: tri-solve + mat-vector */
flopcnt = segsze * (segsze - 1) + 2 * nrow * segsze;
Gstat->procstat[pnum].fcops += flopcnt;
/* Case 1: Update U-segment of size 1 -- col-col update */
if ( segsze == 1 ) {
#ifdef TIMING
f_time = SuperLU_timer_();
#endif
ukj = dense_col[lsub[krep_ind]];
luptr += nsupr*(nsupc-1) + nsupc;
#if ( DEBUGlevel>=2 )
if (krep == BADCOL && jj == -1) {
printf("(%d) psgstrf_bmod1D[segsze=1]: k %d, j %d, ukj %.10e\n",
pnum, lsub[krep_ind], jj, ukj);
PrintInt10("segsze=1", nsupr, &lsub[lptr]);
}
#endif
for (i = lptr + nsupc; i < xlsub_end[fsupc]; i++) {
irow = lsub[i];
dense_col[irow] -= ukj * lusup[luptr];
++luptr;
#ifdef SCATTER_FOUND
if ( col_marker[irow] != jj ) {
col_marker[irow] = jj;
col_lsub[w_lsub_end[jj-jcol]++] = irow;
}
#endif
}
#ifdef TIMING
utime[FLOAT] += SuperLU_timer_() - f_time;
#endif
} else if ( segsze <= 3 ) {
#ifdef TIMING
f_time = SuperLU_timer_();
#endif
ukj = dense_col[lsub[krep_ind]];
luptr += nsupr*(nsupc-1) + nsupc-1;
ukj1 = dense_col[lsub[krep_ind - 1]];
luptr1 = luptr - nsupr;
if ( segsze == 2 ) {
ukj -= ukj1 * lusup[luptr1];
dense_col[lsub[krep_ind]] = ukj;
for (i = lptr + nsupc; i < xlsub_end[fsupc]; ++i) {
irow = lsub[i];
++luptr; ++luptr1;
dense_col[irow] -= (ukj * lusup[luptr]
+ ukj1 * lusup[luptr1]);
#ifdef SCATTER_FOUND
if ( col_marker[irow] != jj ) {
col_marker[irow] = jj;
col_lsub[w_lsub_end[jj-jcol]++] = irow;
}
#endif
}
} else {
ukj2 = dense_col[lsub[krep_ind - 2]];
luptr2 = luptr1 - nsupr;
ukj1 -= ukj2 * lusup[luptr2-1];
ukj = ukj - ukj1*lusup[luptr1] - ukj2*lusup[luptr2];
dense_col[lsub[krep_ind]] = ukj;
dense_col[lsub[krep_ind-1]] = ukj1;
for (i = lptr + nsupc; i < xlsub_end[fsupc]; ++i) {
irow = lsub[i];
++luptr; ++luptr1; ++luptr2;
dense_col[irow] -= (ukj * lusup[luptr]
+ ukj1*lusup[luptr1] + ukj2*lusup[luptr2]);
#ifdef SCATTER_FOUND
if ( col_marker[irow] != jj ) {
col_marker[irow] = jj;
col_lsub[w_lsub_end[jj-jcol]++] = irow;
}
#endif
}
}
#ifdef TIMING
utime[FLOAT] += SuperLU_timer_() - f_time;
#endif
} else { /* segsze >= 4 */
/*
* Perform a triangular solve and matrix-vector update,
* then scatter the result of sup-col update to dense[*].
*/
no_zeros = kfnz - fsupc;
/* Gather U[*,j] segment from dense[*] to tempv[*]:
* The result of triangular solve is in tempv[*];
* The result of matrix vector update is in dense_col[*]
*/
isub = lptr + no_zeros;
/*#pragma ivdep*/
for (i = 0; i < segsze; ++i) {
irow = lsub[isub];
tempv[i] = dense_col[irow]; /* Gather */
++isub;
}
/* start effective triangle */
luptr += nsupr * no_zeros + no_zeros;
#ifdef TIMING
f_time = SuperLU_timer_();
#endif
#ifdef USE_VENDOR_BLAS
#if ( MACH==CRAY_PVP )
STRSV( ftcs1, ftcs2, ftcs3, &segsze, &lusup[luptr],
&nsupr, tempv, &incx );
#else
strsv_( "L", "N", "U", &segsze, &lusup[luptr],
&nsupr, tempv, &incx );
#endif
luptr += segsze; /* Dense matrix-vector */
tempv1 = &tempv[segsze];
alpha = one;
beta = zero;
#if ( MACH==CRAY_PVP )
SGEMV( ftcs2, &nrow, &segsze, &alpha, &lusup[luptr],
&nsupr, tempv, &incx, &beta, tempv1, &incy );
#else
sgemv_( "N", &nrow, &segsze, &alpha, &lusup[luptr],
&nsupr, tempv, &incx, &beta, tempv1, &incy );
#endif /* _CRAY_PVP */
#else
slsolve ( nsupr, segsze, &lusup[luptr], tempv );
luptr += segsze; /* Dense matrix-vector */
tempv1 = &tempv[segsze];
smatvec (nsupr, nrow, segsze, &lusup[luptr], tempv, tempv1);
#endif
#ifdef TIMING
utime[FLOAT] += SuperLU_timer_() - f_time;
#endif
/* Scatter tempv[*] into SPA dense[*] temporarily,
* such that tempv[*] can be used for the triangular solve of
* the next column of the panel. They will be copied into
* ucol[*] after the whole panel has been finished.
*/
isub = lptr + no_zeros;
/*#pragma ivdep*/
for (i = 0; i < segsze; i++) {
irow = lsub[isub];
dense_col[irow] = tempv[i]; /* Scatter */
tempv[i] = zero;
isub++;
#if ( DEBUGlevel>=2 )
if (jj == -1 && krep == 3423)
printf("(%d) psgstrf_bmod1D[scatter] jj %d, dense_col[%d] %e\n",
pnum, jj, irow, dense_col[irow]);
#endif
}
/* Scatter the update from tempv1[*] into SPA dense[*] */
/*#pragma ivdep*/
for (i = 0; i < nrow; i++) {
irow = lsub[isub];
dense_col[irow] -= tempv1[i]; /* Scatter-add */
#ifdef SCATTER_FOUND
if ( col_marker[irow] != jj ) {
col_marker[irow] = jj;
col_lsub[w_lsub_end[jj-jcol]++] = irow;
}
#endif
tempv1[i] = zero;
isub++;
}
} /* else segsze >= 4 ... */
} /* for jj ... */
}
};
};
};
};
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