lapacke_zhegvx.c

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

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

lapack_int LAPACKE_zhegvx( int matrix_order, lapack_int itype, char jobz,
                           char range, char uplo, lapack_int n,
                           lapack_complex_double* a, lapack_int lda,
                           lapack_complex_double* b, lapack_int ldb, 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* ifail )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    double* rwork = NULL;
    lapack_complex_double* work = NULL;
    lapack_complex_double work_query;
    if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zhegvx", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    /* Optionally check input matrices for NaNs */
    if( LAPACKE_zhe_nancheck( matrix_order, uplo, n, a, lda ) ) {
        return -7;
    }
    if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
        return -15;
    }
    if( LAPACKE_zge_nancheck( matrix_order, n, n, b, ldb ) ) {
        return -9;
    }
    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
    /* 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;
    }
    rwork = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,7*n) );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_zhegvx_work( matrix_order, itype, jobz, range, uplo, n, a,
                                lda, b, ldb, vl, vu, il, iu, abstol, m, w, z,
                                ldz, &work_query, lwork, rwork, iwork, ifail );
    if( info != 0 ) {
        goto exit_level_2;
    }
    lwork = LAPACK_Z2INT( work_query );
    /* Allocate memory for work arrays */
    work = (lapack_complex_double*)
        LAPACKE_malloc( sizeof(lapack_complex_double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_2;
    }
    /* Call middle-level interface */
    info = LAPACKE_zhegvx_work( matrix_order, itype, jobz, range, uplo, n, a,
                                lda, b, ldb, vl, vu, il, iu, abstol, m, w, z,
                                ldz, work, lwork, rwork, iwork, ifail );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_2:
    LAPACKE_free( rwork );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_zhegvx", info );
    }
    return info;
}