lapacke_dggesx.c

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* Contents: Native high-level C interface to LAPACK function dggesx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dggesx( int matrix_layout, char jobvsl, char jobvsr,
                           char sort, LAPACK_D_SELECT3 selctg, char sense,
                           lapack_int n, double* a, lapack_int lda, double* b,
                           lapack_int ldb, lapack_int* sdim, double* alphar,
                           double* alphai, double* beta, double* vsl,
                           lapack_int ldvsl, double* vsr, lapack_int ldvsr,
                           double* rconde, double* rcondv )
{
    lapack_int info = 0;
    lapack_int liwork = -1;
    lapack_int lwork = -1;
    lapack_logical* bwork = NULL;
    lapack_int* iwork = NULL;
    double* work = NULL;
    lapack_int iwork_query;
    double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dggesx", -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 -8;
        }
        if( LAPACKE_dge_nancheck( matrix_layout, n, n, b, ldb ) ) {
            return -10;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    if( LAPACKE_lsame( sort, 's' ) ) {
        bwork = (lapack_logical*)
            LAPACKE_malloc( sizeof(lapack_logical) * MAX(1,n) );
        if( bwork == NULL ) {
            info = LAPACK_WORK_MEMORY_ERROR;
            goto exit_level_0;
        }
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_dggesx_work( matrix_layout, jobvsl, jobvsr, sort, selctg,
                                sense, n, a, lda, b, ldb, sdim, alphar, alphai,
                                beta, vsl, ldvsl, vsr, ldvsr, rconde, rcondv,
                                &work_query, lwork, &iwork_query, liwork,
                                bwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    liwork = 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_1;
    }
    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_dggesx_work( matrix_layout, jobvsl, jobvsr, sort, selctg,
                                sense, n, a, lda, b, ldb, sdim, alphar, alphai,
                                beta, vsl, ldvsl, vsr, ldvsr, rconde, rcondv,
                                work, lwork, iwork, liwork, bwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_2:
    LAPACKE_free( iwork );
exit_level_1:
    if( LAPACKE_lsame( sort, 's' ) ) {
        LAPACKE_free( bwork );
    }
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dggesx", info );
    }
    return info;
}