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*****************************************************************************
* Contents: Native middle-level C interface to LAPACK function dgejsv
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_dgejsv_work( int matrix_layout, char joba, char jobu,
                                char jobv, char jobr, char jobt, char jobp,
                                lapack_int m, lapack_int n, double* a,
                                lapack_int lda, double* sva, double* u,
                                lapack_int ldu, double* v, lapack_int ldv,
                                double* work, lapack_int lwork,
                                lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dgejsv( &joba, &jobu, &jobv, &jobr, &jobt, &jobp, &m, &n, a,
                       &lda, sva, u, &ldu, v, &ldv, work, &lwork, iwork,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int nu = LAPACKE_lsame( jobu, 'n' ) ? 1 : m;
        lapack_int nv = LAPACKE_lsame( jobv, 'n' ) ? 1 : n;
        lapack_int ncols_u = LAPACKE_lsame( jobu, 'n' ) ? 1 :
            LAPACKE_lsame( jobu, 'f' ) ? m : n;
        lapack_int lda_t = MAX(1,m);
        lapack_int ldu_t = MAX(1,nu);
        lapack_int ldv_t = MAX(1,nv);
        double* a_t = NULL;
        double* u_t = NULL;
        double* v_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_dgejsv_work", info );
            return info;
        }
        if( ldu < ncols_u ) {
            info = -14;
            LAPACKE_xerbla( "LAPACKE_dgejsv_work", info );
            return info;
        }
        if( ldv < n ) {
            info = -16;
            LAPACKE_xerbla( "LAPACKE_dgejsv_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( jobu, 'f' ) || LAPACKE_lsame( jobu, 'u' ) ||
            LAPACKE_lsame( jobu, 'w' ) ) {
            u_t = (double*)LAPACKE_malloc( sizeof(double) * ldu_t * MAX(1,ncols_u) );
            if( u_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        if( LAPACKE_lsame( jobv, 'j' ) || LAPACKE_lsame( jobv, 'v' ) ||
            LAPACKE_lsame( jobv, 'w' ) ) {
            v_t = (double*)LAPACKE_malloc( sizeof(double) * ldv_t * MAX(1,n) );
            if( v_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dgejsv( &joba, &jobu, &jobv, &jobr, &jobt, &jobp, &m, &n, a_t,
                       &lda_t, sva, u_t, &ldu_t, v_t, &ldv_t, work, &lwork,
                       iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( jobu, 'f' ) || LAPACKE_lsame( jobu, 'u' ) ||
            LAPACKE_lsame( jobu, 'w' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, nu, ncols_u, u_t, ldu_t, u, ldu );
        }
        if( LAPACKE_lsame( jobv, 'j' ) || LAPACKE_lsame( jobv, 'v' ) ||
            LAPACKE_lsame( jobv, 'w' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, nv, n, v_t, ldv_t, v, ldv );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobv, 'j' ) || LAPACKE_lsame( jobv, 'v' ) ||
            LAPACKE_lsame( jobv, 'w' ) ) {
            LAPACKE_free( v_t );
        }
exit_level_2:
        if( LAPACKE_lsame( jobu, 'f' ) || LAPACKE_lsame( jobu, 'u' ) ||
            LAPACKE_lsame( jobu, 'w' ) ) {
            LAPACKE_free( u_t );
        }
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dgejsv_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dgejsv_work", info );
    }
    return info;
}
