lapacke_sggbak_work.c

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* Contents: Native middle-level C interface to LAPACK function sggbak
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sggbak_work( int matrix_layout, char job, char side,
                                lapack_int n, lapack_int ilo, lapack_int ihi,
                                const float* lscale, const float* rscale,
                                lapack_int m, float* v, lapack_int ldv )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sggbak( &job, &side, &n, &ilo, &ihi, lscale, rscale, &m, v, &ldv,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldv_t = MAX(1,n);
        float* v_t = NULL;
        /* Check leading dimension(s) */
        if( ldv < m ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_sggbak_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        v_t = (float*)LAPACKE_malloc( sizeof(float) * ldv_t * MAX(1,m) );
        if( v_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        /* Transpose input matrices */
        LAPACKE_sge_trans( matrix_layout, n, m, v, ldv, v_t, ldv_t );
        /* Call LAPACK function and adjust info */
        LAPACK_sggbak( &job, &side, &n, &ilo, &ihi, lscale, rscale, &m, v_t,
                       &ldv_t, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, m, v_t, ldv_t, v, ldv );
        /* Release memory and exit */
        LAPACKE_free( v_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_sggbak_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sggbak_work", info );
    }
    return info;
}