lapacke_dgesvdq.c

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* Contents: Native high-level C interface to LAPACK function dgesvdq
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dgesvdq( int matrix_layout, char joba, char jobp,
                           char jobr, char jobu, char jobv,
                           lapack_int m, lapack_int n, double* a,
                           lapack_int lda, double* s, double* u, lapack_int ldu,
                           double* v, lapack_int ldv, lapack_int* numrank)
{
    lapack_int info = 0;
    lapack_int liwork = -1;
    lapack_int* iwork = NULL;
    lapack_int iwork_query;
    lapack_int lwork = -1;
    double* work = NULL;
    double work_query;
    lapack_int lrwork = -1;
    double* rwork = NULL;
    double rwork_query;
    lapack_int i;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dgesvdq", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
            return -6;
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_dgesvdq_work( matrix_layout, joba, jobp, jobr, jobu, jobv,
                                 m, n, a, lda, s, u, ldu, v, ldv, numrank,
                                 &iwork_query, liwork, &work_query, lwork,
                                 &rwork_query, lrwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    liwork = iwork_query;
    lwork = (lapack_int)work_query;
    lrwork = (lapack_int)rwork_query;
    /* Allocate memory for work arrays */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    rwork = (double*)LAPACKE_malloc( sizeof(double) * lrwork );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_dgesvdq_work( matrix_layout, joba, jobp, jobr, jobu, jobv,
                                 m, n, a, lda, s, u, ldu, v, ldv, numrank,
                                 iwork, liwork, work, lwork, rwork, lrwork );
 
    /* Release memory and exit */
    LAPACKE_free( iwork );
    LAPACKE_free( work );
    LAPACKE_free( rwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dgesvdq", info );
    }
    return info;
}