lapacke_dgbsvx_work.c

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* Contents: Native middle-level C interface to LAPACK function dgbsvx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dgbsvx_work( int matrix_layout, char fact, char trans,
                                lapack_int n, lapack_int kl, lapack_int ku,
                                lapack_int nrhs, double* ab, lapack_int ldab,
                                double* afb, lapack_int ldafb, lapack_int* ipiv,
                                char* equed, double* r, double* c, double* b,
                                lapack_int ldb, double* x, lapack_int ldx,
                                double* rcond, double* ferr, double* berr,
                                double* work, lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dgbsvx( &fact, &trans, &n, &kl, &ku, &nrhs, ab, &ldab, afb,
                       &ldafb, ipiv, equed, r, c, b, &ldb, x, &ldx, rcond, ferr,
                       berr, work, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,kl+ku+1);
        lapack_int ldafb_t = MAX(1,2*kl+ku+1);
        lapack_int ldb_t = MAX(1,n);
        lapack_int ldx_t = MAX(1,n);
        double* ab_t = NULL;
        double* afb_t = NULL;
        double* b_t = NULL;
        double* x_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_dgbsvx_work", info );
            return info;
        }
        if( ldafb < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_dgbsvx_work", info );
            return info;
        }
        if( ldb < nrhs ) {
            info = -17;
            LAPACKE_xerbla( "LAPACKE_dgbsvx_work", info );
            return info;
        }
        if( ldx < nrhs ) {
            info = -19;
            LAPACKE_xerbla( "LAPACKE_dgbsvx_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
        if( ab_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        afb_t = (double*)LAPACKE_malloc( sizeof(double) * ldafb_t * MAX(1,n) );
        if( afb_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        x_t = (double*)LAPACKE_malloc( sizeof(double) * ldx_t * MAX(1,nrhs) );
        if( x_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_3;
        }
        /* Transpose input matrices */
        LAPACKE_dgb_trans( matrix_layout, n, n, kl, ku, ab, ldab, ab_t, ldab_t );
        if( LAPACKE_lsame( fact, 'f' ) ) {
            LAPACKE_dgb_trans( matrix_layout, n, n, kl, kl+ku, afb, ldafb, afb_t,
                               ldafb_t );
        }
        LAPACKE_dge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dgbsvx( &fact, &trans, &n, &kl, &ku, &nrhs, ab_t, &ldab_t, afb_t,
                       &ldafb_t, ipiv, equed, r, c, b_t, &ldb_t, x_t, &ldx_t,
                       rcond, ferr, berr, work, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( fact, 'e' ) && ( LAPACKE_lsame( *equed, 'b' ) ||
            LAPACKE_lsame( *equed, 'c' ) || LAPACKE_lsame( *equed, 'r' ) ) ) {
            LAPACKE_dgb_trans( LAPACK_COL_MAJOR, n, n, kl, ku, ab_t, ldab_t, ab,
                               ldab );
        }
        if( LAPACKE_lsame( fact, 'e' ) || LAPACKE_lsame( fact, 'n' ) ) {
            LAPACKE_dgb_trans( LAPACK_COL_MAJOR, n, n, kl, kl+ku, afb_t,
                               ldafb_t, afb, ldafb );
        }
        if( LAPACKE_lsame( fact, 'f' ) && ( LAPACKE_lsame( *equed, 'b' ) ||
            LAPACKE_lsame( *equed, 'c' ) || LAPACKE_lsame( *equed, 'r' ) ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, nrhs, b_t, ldb_t, b, ldb );
        }
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, nrhs, x_t, ldx_t, x, ldx );
        /* Release memory and exit */
        LAPACKE_free( x_t );
exit_level_3:
        LAPACKE_free( b_t );
exit_level_2:
        LAPACKE_free( afb_t );
exit_level_1:
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dgbsvx_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dgbsvx_work", info );
    }
    return info;
}