lapacke_shgeqz.c

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

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

lapack_int LAPACKE_shgeqz( int matrix_order, char job, char compq, char compz,
                           lapack_int n, lapack_int ilo, lapack_int ihi,
                           float* h, lapack_int ldh, float* t, lapack_int ldt,
                           float* alphar, float* alphai, float* beta, float* q,
                           lapack_int ldq, float* z, lapack_int ldz )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    float* work = NULL;
    float work_query;
    if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_shgeqz", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    /* Optionally check input matrices for NaNs */
    if( LAPACKE_sge_nancheck( matrix_order, n, n, h, ldh ) ) {
        return -8;
    }
    if( LAPACKE_lsame( compq, 'i' ) || LAPACKE_lsame( compq, 'v' ) ) {
        if( LAPACKE_sge_nancheck( matrix_order, n, n, q, ldq ) ) {
            return -15;
        }
    }
    if( LAPACKE_sge_nancheck( matrix_order, n, n, t, ldt ) ) {
        return -10;
    }
    if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
        if( LAPACKE_sge_nancheck( matrix_order, n, n, z, ldz ) ) {
            return -17;
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_shgeqz_work( matrix_order, job, compq, compz, n, ilo, ihi, h,
                                ldh, t, ldt, alphar, alphai, beta, q, ldq, z,
                                ldz, &work_query, lwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_shgeqz_work( matrix_order, job, compq, compz, n, ilo, ihi, h,
                                ldh, t, ldt, alphar, alphai, beta, q, ldq, z,
                                ldz, work, lwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_shgeqz", info );
    }
    return info;
}