lapacke_dorcsd2by1.c

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* Contents: Native high-level C interface to LAPACK function dorcsd2by1
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dorcsd2by1( int matrix_layout, char jobu1, char jobu2,
                           char jobv1t, lapack_int m, lapack_int p, lapack_int q,
                           double* x11, lapack_int ldx11, double* x21, lapack_int ldx21,
                           double* theta, double* u1, lapack_int ldu1, double* u2,
                           lapack_int ldu2, double* v1t, lapack_int ldv1t )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    double* work = NULL;
    double work_query;
    lapack_int nrows_x11, nrows_x21;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dorcsd2by1", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        nrows_x11 = p;
        nrows_x21 = m-p;
        if( LAPACKE_dge_nancheck( matrix_layout, nrows_x11, q, x11, ldx11 ) ) {
            return -8;
        }
 
        if( LAPACKE_dge_nancheck( matrix_layout, nrows_x21, q, x21, ldx21 ) ) {
            return -9;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,m-MIN(MIN(p,m-p),MIN(q,m-q))) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_dorcsd2by1_work( matrix_layout, jobu1, jobu2, jobv1t, m, p, q,
                                x11, ldx11, x21, ldx21, theta, u1, ldu1, u2,
                                ldu2, v1t, ldv1t, &work_query,
                                lwork, iwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    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_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_dorcsd2by1_work( matrix_layout, jobu1, jobu2, jobv1t, m, p, q,
                                x11, ldx11, x21, ldx21, theta, u1, ldu1, u2,
                                ldu2, v1t, ldv1t, work, lwork, iwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dorcsd2by1", info );
    }
    return info;
}