lapacke_dbdsvdx_work.c

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* Contents: Native middle-level C interface to LAPACK function dbdsvdx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dbdsvdx_work( int matrix_layout, char uplo, char jobz, char range,
                                 lapack_int n, double* d, double* e,
                                 double vl, double vu,
                                 lapack_int il, lapack_int iu, lapack_int* ns,
                                 double* s, double* z, lapack_int ldz,
                                 double* work, lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dbdsvdx( &uplo, &jobz,  &range, &n, d, e, &vl, &vu,
                        &il, &iu, ns, s, z, &ldz,
                        work, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int nrows_z = ( LAPACKE_lsame( jobz, 'v' ) ) ? 2*n : 0;
        lapack_int ncols_z = ( LAPACKE_lsame( jobz, 'v' ) ) ?
            ( LAPACKE_lsame( range, 'i' ) ? MAX(0,iu - il + 1) : n + 1 ) : 0;
        lapack_int ldz_t = MAX(1,nrows_z);
        double* z_t = NULL;
        /* Check leading dimension(s) */
        if( ldz < ncols_z ) {
            info = -3;
            LAPACKE_xerbla( "LAPACKE_dbdsvdx_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        if( LAPACKE_lsame( jobz, 'v' ) ) {
           z_t = (double*)
              LAPACKE_malloc( sizeof(double) * ldz_t * MAX(ncols_z,1) );
           if( z_t == NULL ) {
              info = LAPACK_TRANSPOSE_MEMORY_ERROR;
              goto exit_level_0;
           }
        }
        /* Call LAPACK function and adjust info */
        LAPACK_dbdsvdx( &uplo, &jobz, &range, &n, d, e, &vl, &vu,
                        &il, &iu, ns, s, z_t, &ldz_t, work,
                        iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, nrows_z, ncols_z, z_t, ldz_t, z, ldz);
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_free( z_t );
        }
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dbdsvdx_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dbdsvdx_work", info );
    }
    return info;
}