lapacke_dsbevx_2stage.c

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* Contents: Native high-level C interface to LAPACK function dsbevx_2stage
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dsbevx_2stage( int matrix_layout, char jobz, char range, char uplo,
                           lapack_int n, lapack_int kd, double* ab,
                           lapack_int ldab, double* q, lapack_int ldq,
                           double vl, double vu, lapack_int il, lapack_int iu,
                           double abstol, lapack_int* m, double* w, double* z,
                           lapack_int ldz, lapack_int* ifail )
{
    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_dsbevx_2stage", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dsb_nancheck( matrix_layout, uplo, n, kd, ab, ldab ) ) {
            return -7;
        }
        if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
            return -15;
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
                return -11;
            }
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
                return -12;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_dsbevx_2stage_work( matrix_layout, jobz, range, uplo, n, kd, ab,
                                ldab, q, ldq, vl, vu, il, iu, abstol, m, w, z,
                                ldz, &work_query, lwork, iwork, ifail );
    if( info != 0 ) {
        goto exit_level_0;
    }
    lwork = (lapack_int) work_query;
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,5*n) );
    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_dsbevx_2stage_work( matrix_layout, jobz, range, uplo, n, kd, ab,
                                ldab, q, ldq, vl, vu, il, iu, abstol, m, w, z,
                                ldz, work, lwork, iwork, ifail );
    /* 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_dsbevx_2stage", info );
    }
    return info;
}