lapacke_ztrexc_work.c

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* Contents: Native middle-level C interface to LAPACK function ztrexc
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_ztrexc_work( int matrix_layout, char compq, lapack_int n,
                                lapack_complex_double* t, lapack_int ldt,
                                lapack_complex_double* q, lapack_int ldq,
                                lapack_int ifst, lapack_int ilst )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_ztrexc( &compq, &n, t, &ldt, q, &ldq, &ifst, &ilst, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldq_t = MAX(1,n);
        lapack_int ldt_t = MAX(1,n);
        lapack_complex_double* t_t = NULL;
        lapack_complex_double* q_t = NULL;
        /* Check leading dimension(s) */
        if( ldq < n && LAPACKE_lsame( compq, 'v' ) ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_ztrexc_work", info );
            return info;
        }
        if( ldt < n ) {
            info = -5;
            LAPACKE_xerbla( "LAPACKE_ztrexc_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        t_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldt_t * MAX(1,n) );
        if( t_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( compq, 'v' ) ) {
            q_t = (lapack_complex_double*)
                LAPACKE_malloc( sizeof(lapack_complex_double) *
                                ldq_t * MAX(1,n) );
            if( q_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, n, n, t, ldt, t_t, ldt_t );
        if( LAPACKE_lsame( compq, 'v' ) ) {
            LAPACKE_zge_trans( matrix_layout, n, n, q, ldq, q_t, ldq_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_ztrexc( &compq, &n, t_t, &ldt_t, q_t, &ldq_t, &ifst, &ilst,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, t_t, ldt_t, t, ldt );
        if( LAPACKE_lsame( compq, 'v' ) ) {
            LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( compq, 'v' ) ) {
            LAPACKE_free( q_t );
        }
exit_level_1:
        LAPACKE_free( t_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_ztrexc_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_ztrexc_work", info );
    }
    return info;
}