lapacke_dbbcsd.c

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* Contents: Native high-level C interface to LAPACK function dbbcsd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dbbcsd( int matrix_layout, char jobu1, char jobu2,
                           char jobv1t, char jobv2t, char trans, lapack_int m,
                           lapack_int p, lapack_int q, double* theta,
                           double* phi, double* u1, lapack_int ldu1, double* u2,
                           lapack_int ldu2, double* v1t, lapack_int ldv1t,
                           double* v2t, lapack_int ldv2t, double* b11d,
                           double* b11e, double* b12d, double* b12e,
                           double* b21d, double* b21e, double* b22d,
                           double* b22e )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    double* work = NULL;
    double work_query;
    int lapack_layout;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dbbcsd", -1 );
        return -1;
    }
    if( LAPACKE_lsame( trans, 'n' ) && matrix_layout == LAPACK_COL_MAJOR ) {
        lapack_layout = LAPACK_COL_MAJOR;
    } else {
        lapack_layout = LAPACK_ROW_MAJOR;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_d_nancheck( q-1, phi, 1 ) ) {
            return -11;
        }
        if( LAPACKE_d_nancheck( q, theta, 1 ) ) {
            return -10;
        }
        if( LAPACKE_lsame( jobu1, 'y' ) ) {
            if( LAPACKE_dge_nancheck( lapack_layout, p, p, u1, ldu1 ) ) {
                return -12;
            }
        }
        if( LAPACKE_lsame( jobu2, 'y' ) ) {
            if( LAPACKE_dge_nancheck( lapack_layout, m-p, m-p, u2, ldu2 ) ) {
                return -14;
            }
        }
        if( LAPACKE_lsame( jobv1t, 'y' ) ) {
            if( LAPACKE_dge_nancheck( lapack_layout, q, q, v1t, ldv1t ) ) {
                return -16;
            }
        }
        if( LAPACKE_lsame( jobv2t, 'y' ) ) {
            if( LAPACKE_dge_nancheck( lapack_layout, m-q, m-q, v2t, ldv2t ) ) {
                return -18;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_dbbcsd_work( matrix_layout, jobu1, jobu2, jobv1t, jobv2t,
                                trans, m, p, q, theta, phi, u1, ldu1, u2, ldu2,
                                v1t, ldv1t, v2t, ldv2t, b11d, b11e, b12d, b12e,
                                b21d, b21e, b22d, b22e, &work_query, lwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_dbbcsd_work( matrix_layout, jobu1, jobu2, jobv1t, jobv2t,
                                trans, m, p, q, theta, phi, u1, ldu1, u2, ldu2,
                                v1t, ldv1t, v2t, ldv2t, b11d, b11e, b12d, b12e,
                                b21d, b21e, b22d, b22e, work, lwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dbbcsd", info );
    }
    return info;
}