lapacke_dtrexc_work.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_dtrexc_work (int matrix_layout, char compq, lapack_int n, double *t, lapack_int ldt, double *q, lapack_int ldq, lapack_int *ifst, lapack_int *ilst, double *work)

Function Documentation

LAPACKE_dtrexc_work()

lapack_int LAPACKE_dtrexc_work	(	int	matrix_layout,
		char	compq,
		lapack_int	n,
		double *	t,
		lapack_int	ldt,
		double *	q,
		lapack_int	ldq,
		lapack_int *	ifst,
		lapack_int *	ilst,
		double *	work )

Definition at line 35 of file lapacke_dtrexc_work.c.

{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dtrexc( &compq, &n, t, &ldt, q, &ldq, ifst, ilst, work, &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);
        double* t_t = NULL;
        double* q_t = NULL;
        /* Check leading dimension(s) */
        if( ldq < n && LAPACKE_lsame( compq, 'v' ) ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dtrexc_work", info );
            return info;
        }
        if( ldt < n ) {
            info = -5;
            LAPACKE_xerbla( "LAPACKE_dtrexc_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        t_t = (double*)LAPACKE_malloc( sizeof(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 = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
            if( q_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, n, n, t, ldt, t_t, ldt_t );
        if( LAPACKE_lsame( compq, 'v' ) ) {
            LAPACKE_dge_trans( matrix_layout, n, n, q, ldq, q_t, ldq_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_dtrexc( &compq, &n, t_t, &ldt_t, q_t, &ldq_t, ifst, ilst, work,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, t_t, ldt_t, t, ldt );
        if( LAPACKE_lsame( compq, 'v' ) ) {
            LAPACKE_dge_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_dtrexc_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dtrexc_work", info );
    }
    return info;
}