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* Contents: Native C interface to LAPACK utility function
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

/* Converts input Hessenberg matrix from row-major(C) to column-major(Fortran)
 * layout or vice versa.
 */

void LAPACKE_shs_trans( int matrix_layout, lapack_int n,
                        const float *in, lapack_int ldin,
                        float *out, lapack_int ldout )
{
    if( in == NULL || out == NULL ) return;

    /* Convert subdiagonal first */
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, 1, n-1, &in[1], ldin+1,
                           &out[ldout], ldout+1 );
    } else if ( matrix_layout == LAPACK_ROW_MAJOR ) {
        LAPACKE_sge_trans( LAPACK_ROW_MAJOR, n-1, 1, &in[ldin], ldin+1,
                           &out[1], ldout+1 );
    } else {
        return;
    }

    /* Convert upper triangular. */
    LAPACKE_str_trans( matrix_layout, 'u', 'n', n, in, ldin, out, ldout);
}
