lapacke_zstegr.c

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******************************************************************************
* Contents: Native high-level C interface to LAPACK function zstegr
* Author: Intel Corporation
* Generated October, 2010
*****************************************************************************/

#include "lapacke.h"
#include "lapacke_utils.h"

lapack_int LAPACKE_zstegr( int matrix_order, char jobz, char range,
                           lapack_int n, double* d, double* e, double vl,
                           double vu, lapack_int il, lapack_int iu,
                           double abstol, lapack_int* m, double* w,
                           lapack_complex_double* z, lapack_int ldz,
                           lapack_int* isuppz )
{
    lapack_int info = 0;
    lapack_int liwork = -1;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    double* work = NULL;
    lapack_int iwork_query;
    double work_query;
    if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zstegr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    /* Optionally check input matrices for NaNs */
    if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
        return -11;
    }
    if( LAPACKE_d_nancheck( n, d, 1 ) ) {
        return -5;
    }
    if( LAPACKE_d_nancheck( n, e, 1 ) ) {
        return -6;
    }
    if( LAPACKE_lsame( range, 'v' ) ) {
        if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
            return -7;
        }
    }
    if( LAPACKE_lsame( range, 'v' ) ) {
        if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
            return -8;
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_zstegr_work( matrix_order, jobz, range, n, d, e, vl, vu, il,
                                iu, abstol, m, w, z, ldz, isuppz, &work_query,
                                lwork, &iwork_query, liwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    liwork = (lapack_int)iwork_query;
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    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_zstegr_work( matrix_order, jobz, range, n, d, e, vl, vu, il,
                                iu, abstol, m, w, z, ldz, isuppz, work, lwork,
                                iwork, liwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_zstegr", info );
    }
    return info;
}