lapacke_dsygvd.c

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

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

lapack_int LAPACKE_dsygvd( int matrix_order, lapack_int itype, char jobz,
                           char uplo, lapack_int n, double* a, lapack_int lda,
                           double* b, lapack_int ldb, double* w )
{
    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_dsygvd", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    /* Optionally check input matrices for NaNs */
    if( LAPACKE_dge_nancheck( matrix_order, n, n, a, lda ) ) {
        return -6;
    }
    if( LAPACKE_dge_nancheck( matrix_order, n, n, b, ldb ) ) {
        return -8;
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_dsygvd_work( matrix_order, itype, jobz, uplo, n, a, lda, b,
                                ldb, w, &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_dsygvd_work( matrix_order, itype, jobz, uplo, n, a, lda, b,
                                ldb, w, 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_dsygvd", info );
    }
    return info;
}