lapacke_zstemr.c

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* Contents: Native high-level C interface to LAPACK function zstemr
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zstemr( int matrix_layout, char jobz, char range,
                           lapack_int n, double* d, double* e, double vl,
                           double vu, lapack_int il, lapack_int iu,
                           lapack_int* m, double* w, lapack_complex_double* z,
                           lapack_int ldz, lapack_int nzc, lapack_int* isuppz,
                           lapack_logical* tryrac )
{
    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_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zstemr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_d_nancheck( n, d, 1 ) ) {
            return -5;
        }
        if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
            return -6;
        }
        if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
            return -7;
        }
        if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
            return -8;
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_zstemr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
                                iu, m, w, z, ldz, nzc, isuppz, tryrac,
                                &work_query, lwork, &iwork_query, liwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    liwork = 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_zstemr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
                                iu, m, w, z, ldz, nzc, isuppz, tryrac, 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_zstemr", info );
    }
    return info;
}