lapacke_zggevx.c

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* Contents: Native high-level C interface to LAPACK function zggevx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zggevx( int matrix_layout, char balanc, char jobvl,
                           char jobvr, char sense, lapack_int n,
                           lapack_complex_double* a, lapack_int lda,
                           lapack_complex_double* b, lapack_int ldb,
                           lapack_complex_double* alpha,
                           lapack_complex_double* beta,
                           lapack_complex_double* vl, lapack_int ldvl,
                           lapack_complex_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;
    /* Additional scalars declarations for work arrays */
    lapack_int lrwork;
    lapack_logical* bwork = NULL;
    lapack_int* iwork = NULL;
    double* rwork = NULL;
    lapack_complex_double* work = NULL;
    lapack_complex_double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zggevx", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_zge_nancheck( matrix_layout, n, n, a, lda ) ) {
            return -7;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, n, n, b, ldb ) ) {
            return -9;
        }
    }
#endif
    /* Additional scalars initializations for work arrays */
    if( LAPACKE_lsame( balanc, 's' ) || LAPACKE_lsame( balanc, 'b' ) ) {
        lrwork = MAX(1,6*n);
    } else {
        lrwork = MAX(1,2*n);
    }
    /* 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+2) );
        if( iwork == NULL ) {
            info = LAPACK_WORK_MEMORY_ERROR;
            goto exit_level_1;
        }
    }
    rwork = (double*)LAPACKE_malloc( sizeof(double) * lrwork );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_2;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_zggevx_work( matrix_layout, balanc, jobvl, jobvr, sense, n, a,
                                lda, b, ldb, alpha, beta, vl, ldvl, vr, ldvr,
                                ilo, ihi, lscale, rscale, abnrm, bbnrm, rconde,
                                rcondv, &work_query, lwork, rwork, iwork,
                                bwork );
    if( info != 0 ) {
        goto exit_level_3;
    }
    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_3;
    }
    /* Call middle-level interface */
    info = LAPACKE_zggevx_work( matrix_layout, balanc, jobvl, jobvr, sense, n, a,
                                lda, b, ldb, alpha, beta, vl, ldvl, vr, ldvr,
                                ilo, ihi, lscale, rscale, abnrm, bbnrm, rconde,
                                rcondv, work, lwork, rwork, iwork, bwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_3:
    LAPACKE_free( rwork );
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_zggevx", info );
    }
    return info;
}