lapacke_dgbequ_work.c

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* Contents: Native middle-level C interface to LAPACK function dgbequ
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dgbequ_work( int matrix_layout, lapack_int m, lapack_int n,
                                lapack_int kl, lapack_int ku, const double* ab,
                                lapack_int ldab, double* r, double* c,
                                double* rowcnd, double* colcnd, double* amax )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dgbequ( &m, &n, &kl, &ku, ab, &ldab, r, c, rowcnd, colcnd, amax,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,kl+ku+1);
        double* ab_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dgbequ_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;
        }
        /* Transpose input matrices */
        LAPACKE_dgb_trans( matrix_layout, m, n, kl, ku, ab, ldab, ab_t, ldab_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dgbequ( &m, &n, &kl, &ku, ab_t, &ldab_t, r, c, rowcnd, colcnd,
                       amax, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Release memory and exit */
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dgbequ_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dgbequ_work", info );
    }
    return info;
}