lapacke_dggevx.c

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* Contents: Native high-level C interface to LAPACK function dggevx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dggevx( int matrix_layout, char balanc, char jobvl,
                           char jobvr, char sense, lapack_int n, double* a,
                           lapack_int lda, double* b, lapack_int ldb,
                           double* alphar, double* alphai, double* beta,
                           double* vl, lapack_int ldvl, double* vr,
                           lapack_int ldvr, lapack_int* ilo, lapack_int* ihi,
                           double* lscale, double* rscale, double* abnrm,
                           double* bbnrm, double* rconde, double* rcondv )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_logical* bwork = NULL;
    lapack_int* iwork = NULL;
    double* work = NULL;
    double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dggevx", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dge_nancheck( matrix_layout, n, n, a, lda ) ) {
            return -7;
        }
        if( LAPACKE_dge_nancheck( matrix_layout, n, n, b, ldb ) ) {
            return -9;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    if( LAPACKE_lsame( sense, 'b' ) || LAPACKE_lsame( sense, 'e' ) ||
        LAPACKE_lsame( sense, 'v' ) ) {
        bwork = (lapack_logical*)
            LAPACKE_malloc( sizeof(lapack_logical) * MAX(1,n) );
        if( bwork == NULL ) {
            info = LAPACK_WORK_MEMORY_ERROR;
            goto exit_level_0;
        }
    }
    if( LAPACKE_lsame( sense, 'b' ) || LAPACKE_lsame( sense, 'n' ) ||
        LAPACKE_lsame( sense, 'v' ) ) {
        iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,n+6) );
        if( iwork == NULL ) {
            info = LAPACK_WORK_MEMORY_ERROR;
            goto exit_level_1;
        }
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_dggevx_work( matrix_layout, balanc, jobvl, jobvr, sense, n, a,
                                lda, b, ldb, alphar, alphai, beta, vl, ldvl, vr,
                                ldvr, ilo, ihi, lscale, rscale, abnrm, bbnrm,
                                rconde, rcondv, &work_query, lwork, iwork,
                                bwork );
    if( info != 0 ) {
        goto exit_level_2;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_2;
    }
    /* Call middle-level interface */
    info = LAPACKE_dggevx_work( matrix_layout, balanc, jobvl, jobvr, sense, n, a,
                                lda, b, ldb, alphar, alphai, beta, vl, ldvl, vr,
                                ldvr, ilo, ihi, lscale, rscale, abnrm, bbnrm,
                                rconde, rcondv, work, lwork, iwork, bwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_2:
    if( LAPACKE_lsame( sense, 'b' ) || LAPACKE_lsame( sense, 'n' ) ||
        LAPACKE_lsame( sense, 'v' ) ) {
        LAPACKE_free( iwork );
    }
exit_level_1:
    if( LAPACKE_lsame( sense, 'b' ) || LAPACKE_lsame( sense, 'e' ) ||
        LAPACKE_lsame( sense, 'v' ) ) {
        LAPACKE_free( bwork );
    }
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dggevx", info );
    }
    return info;
}