lapacke_dorbdb.c

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* Contents: Native high-level C interface to LAPACK function dorbdb
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dorbdb( int matrix_layout, char trans, char signs,
                           lapack_int m, lapack_int p, lapack_int q,
                           double* x11, lapack_int ldx11, double* x12,
                           lapack_int ldx12, double* x21, lapack_int ldx21,
                           double* x22, lapack_int ldx22, double* theta,
                           double* phi, double* taup1, double* taup2,
                           double* tauq1, double* tauq2 )
{
    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_dorbdb", -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_dge_nancheck( lapack_layout, p, q, x11, ldx11 ) ) {
            return -7;
        }
        if( LAPACKE_dge_nancheck( lapack_layout, p, m-q, x12, ldx12 ) ) {
            return -9;
        }
        if( LAPACKE_dge_nancheck( lapack_layout, m-p, q, x21, ldx21 ) ) {
            return -11;
        }
        if( LAPACKE_dge_nancheck( lapack_layout, m-p, m-q, x22, ldx22 ) ) {
            return -13;
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_dorbdb_work( matrix_layout, trans, signs, m, p, q, x11, ldx11,
                                x12, ldx12, x21, ldx21, x22, ldx22, theta, phi,
                                taup1, taup2, tauq1, tauq2, &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_dorbdb_work( matrix_layout, trans, signs, m, p, q, x11, ldx11,
                                x12, ldx12, x21, ldx21, x22, ldx22, theta, phi,
                                taup1, taup2, tauq1, tauq2, work, lwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dorbdb", info );
    }
    return info;
}