lapacke_dgeevx.c

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* Contents: Native high-level C interface to LAPACK function dgeevx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dgeevx( int matrix_layout, char balanc, char jobvl,
                           char jobvr, char sense, lapack_int n, double* a,
                           lapack_int lda, double* wr, double* wi, double* vl,
                           lapack_int ldvl, double* vr, lapack_int ldvr,
                           lapack_int* ilo, lapack_int* ihi, double* scale,
                           double* abnrm, double* rconde, double* rcondv )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    double* work = NULL;
    double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dgeevx", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dge_nancheck( matrix_layout, n, n, a, lda ) ) {
            return -7;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    if( LAPACKE_lsame( sense, 'b' ) || LAPACKE_lsame( sense, 'v' ) ) {
        iwork = (lapack_int*)
            LAPACKE_malloc( sizeof(lapack_int) * MAX(1,2*n-2) );
        if( iwork == NULL ) {
            info = LAPACK_WORK_MEMORY_ERROR;
            goto exit_level_0;
        }
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_dgeevx_work( matrix_layout, balanc, jobvl, jobvr, sense, n, a,
                                lda, wr, wi, vl, ldvl, vr, ldvr, ilo, ihi,
                                scale, abnrm, rconde, rcondv, &work_query,
                                lwork, iwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_dgeevx_work( matrix_layout, balanc, jobvl, jobvr, sense, n, a,
                                lda, wr, wi, vl, ldvl, vr, ldvr, ilo, ihi,
                                scale, abnrm, rconde, rcondv, work, lwork,
                                iwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    if( LAPACKE_lsame( sense, 'b' ) || LAPACKE_lsame( sense, 'v' ) ) {
        LAPACKE_free( iwork );
    }
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dgeevx", info );
    }
    return info;
}