cpucblk_sschur.c

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/**
 *
 * @file cpucblk_sschur.c
 *
 * Precision dependent routines to extract the Schur complement.
 *
 * @copyright 2015-2021 Bordeaux INP, CNRS (LaBRI UMR 5800), Inria,
 *                      Univ. Bordeaux. All rights reserved.
 *
 * @version 6.2.0
 * @author Gregoire Pichon
 * @author Mathieu Faverge
 * @date 2021-01-03
 *
 * @generated from /builds/solverstack/pastix/kernels/cpucblk_zschur.c, normal z -> s, Tue Apr 12 09:38:40 2022
 *
 **/
#include "common/common.h"
#include "blend/solver.h"
#include <lapacke.h>
#include "pastix_scores.h"
#include "pastix_slrcores.h"
 
/**
 *******************************************************************************
 *
 * @brief Extract a low-rank cblk panel to a dense lapack form
 *
 *******************************************************************************
 *
 * @param[in] cblk
 *          The column block to extract in the Schur array
 *
 * @param[in] upper_part
 *          If true, the upper part is also extracted in S.
 *
 * @param[inout] S
 *          The pointer to the top of the column of the cblk in the Schur array.
 *          On exit, the computed coefficient are copy to this array.
 *
 * @param[in] lds
 *          The leading dimension of the S array.
 *
 *******************************************************************************/
static inline void
cpucblk_sgetschur_lr( const SolverCblk *cblk, int upper_part,
                      float *S, pastix_int_t lds )
{
    SolverBlok *blok  = cblk[0].fblokptr;
    SolverBlok *lblok = cblk[1].fblokptr;
    pastix_int_t coefind;
    pastix_int_t ncols = cblk_colnbr( cblk );
    int ret;
 
    assert( cblk->cblktype & CBLK_COMPRESSED );
    assert( cblk->cblktype & CBLK_LAYOUT_2D );
 
    for (; blok<lblok; blok++)
    {
        pastix_int_t nrows = blok_rownbr( blok );
 
        nrows   = blok_rownbr( blok );
        coefind = blok->coefind / ncols;
 
        ret = core_slr2ge( PastixNoTrans, nrows, ncols,
                           blok->LRblock[0],
                           S + coefind, lds );
        assert( ret == 0 );
        /* TODO: check/fix with respect to full rank (L+U instead of just L or U)*/
 
        if ( upper_part ) {
            if ( blok == cblk[0].fblokptr ) {
                assert( cblk->fblokptr->LRblock[1]->rk    == -1    );
                assert( cblk->fblokptr->LRblock[1]->rkmax == ncols );
 
                core_sgeadd( PastixTrans, ncols, ncols,
                             1.0, cblk->fblokptr->LRblock[1]->u, ncols,
                             1.0, S + coefind * lds, lds );
 
            } else {
                ret = core_slr2ge( PastixTrans, nrows, ncols,
                                   blok->LRblock[1],
                                   S + coefind * lds, lds );
                assert( ret == 0 );
            }
        }
    }
 
    (void)ret;
}
 
/**
 *******************************************************************************
 *
 * @brief Extract a full-rank cblk panel to a dense lapack form
 *
 *******************************************************************************
 *
 * @param[in] cblk
 *          The column block to extract in the Schur array
 *
 * @param[in] upper_part
 *          If true, the upper part is also extracted in S.
 *
 * @param[inout] S
 *          The pointer to the top of the column of the cblk in the Schur array.
 *          On exit, the computed coefficient are copy to this array.
 *
 * @param[in] lds
 *          The leading dimension of the S array.
 *
 *******************************************************************************/
static inline void
cpucblk_sgetschur_fr( const SolverCblk *cblk, int upper_part,
                      float *S, pastix_int_t lds )
{
    SolverBlok *blok  = cblk[0].fblokptr;
    SolverBlok *lblok = cblk[1].fblokptr;
    pastix_int_t ncols = cblk_colnbr( cblk );
    pastix_int_t nrows, coefind, stride, ret;
    float *lcoeftab = cblk->lcoeftab;
    float *ucoeftab = cblk->ucoeftab;
    int layout2d = ( cblk->cblktype & CBLK_LAYOUT_2D );
 
    assert( !(cblk->cblktype & CBLK_COMPRESSED) );
 
    for (; blok<lblok; blok++)
    {
        nrows = blok_rownbr( blok );
 
        if (layout2d) {
            coefind = blok->coefind / ncols;
            stride  = nrows;
        }
        else {
            coefind = blok->coefind;
            stride  = cblk->stride;
        }
 
        ret = LAPACKE_slacpy_work( LAPACK_COL_MAJOR, 'A', nrows, ncols,
                                   lcoeftab + blok->coefind, stride,
                                   S + coefind, lds );
        assert( ret == 0 );
 
        if ( upper_part )
        {
            core_sgeadd( PastixTrans, ncols, nrows,
                         1.0, ucoeftab + blok->coefind, stride,
                         1.0, S + coefind * lds, lds );
        }
    }
 
    (void)ret;
}
 
/**
 *******************************************************************************
 *
 * @brief Extract a cblk panel of the Schur complement to a dense lapack form.
 *
 *******************************************************************************
 *
 * @param[in] cblk
 *          The column block to extract in the Schur array
 *
 * @param[in] upper_part
 *          If true, the upper part is also extracted in S.
 *
 * @param[inout] S
 *          The pointer to the top of the column of the cblk in the Schur array.
 *          On exit, the computed coefficient are copy to this array.
 *
 * @param[in] lds
 *          The leading dimension of the S array.
 *
 *******************************************************************************/
void
cpucblk_sgetschur( const SolverCblk *cblk, int upper_part,
                   float *S, pastix_int_t lds )
{
    if ( cblk->cblktype & CBLK_COMPRESSED ) {
        cpucblk_sgetschur_lr( cblk, upper_part, S, lds );
    }
    else {
        cpucblk_sgetschur_fr( cblk, upper_part, S, lds );
    }
}