lapacke_zgeesx_work.c

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* Contents: Native middle-level C interface to LAPACK function zgeesx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zgeesx_work( int matrix_layout, char jobvs, char sort,
                                LAPACK_Z_SELECT1 select, char sense,
                                lapack_int n, lapack_complex_double* a,
                                lapack_int lda, lapack_int* sdim,
                                lapack_complex_double* w,
                                lapack_complex_double* vs, lapack_int ldvs,
                                double* rconde, double* rcondv,
                                lapack_complex_double* work, lapack_int lwork,
                                double* rwork, lapack_logical* bwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zgeesx( &jobvs, &sort, select, &sense, &n, a, &lda, sdim, w, vs,
                       &ldvs, rconde, rcondv, work, &lwork, rwork, bwork,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        lapack_int ldvs_t = MAX(1,n);
        lapack_complex_double* a_t = NULL;
        lapack_complex_double* vs_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_zgeesx_work", info );
            return info;
        }
        if( ldvs < n ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_zgeesx_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_zgeesx( &jobvs, &sort, select, &sense, &n, a, &lda_t, sdim,
                           w, vs, &ldvs_t, rconde, rcondv, work, &lwork, rwork,
                           bwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( jobvs, 'v' ) ) {
            vs_t = (lapack_complex_double*)
                LAPACKE_malloc( sizeof(lapack_complex_double) *
                                ldvs_t * MAX(1,n) );
            if( vs_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zgeesx( &jobvs, &sort, select, &sense, &n, a_t, &lda_t, sdim, w,
                       vs_t, &ldvs_t, rconde, rcondv, work, &lwork, rwork,
                       bwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
        if( LAPACKE_lsame( jobvs, 'v' ) ) {
            LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, vs_t, ldvs_t, vs, ldvs );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobvs, 'v' ) ) {
            LAPACKE_free( vs_t );
        }
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zgeesx_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zgeesx_work", info );
    }
    return info;
}