lapacke_sgges3.c

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* Contents: Native high-level C interface to LAPACK function sgges3
* Author: Intel Corporation
* Generated February, 2015
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_sgges3( int matrix_layout, char jobvsl, char jobvsr,
                           char sort, LAPACK_S_SELECT3 selctg, lapack_int n,
                           float* a, lapack_int lda, float* b, lapack_int ldb,
                           lapack_int* sdim, float* alphar, float* alphai,
                           float* beta, float* vsl, lapack_int ldvsl,
                           float* vsr, lapack_int ldvsr )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_logical* bwork = NULL;
    float* work = NULL;
    float work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_sgges3", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    /* Optionally check input matrices for NaNs */
    if( LAPACKE_sge_nancheck( matrix_layout, n, n, a, lda ) ) {
        return -7;
    }
    if( LAPACKE_sge_nancheck( matrix_layout, n, n, b, ldb ) ) {
        return -9;
    }
#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_sgges3_work( matrix_layout, jobvsl, jobvsr, sort, selctg, n,
                                a, lda, b, ldb, sdim, alphar, alphai, beta, vsl,
                                ldvsl, vsr, ldvsr, &work_query, lwork, bwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    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_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_sgges3_work( matrix_layout, jobvsl, jobvsr, sort, selctg, n,
                                a, lda, b, ldb, sdim, alphar, alphai, beta, vsl,
                                ldvsl, vsr, ldvsr, work, lwork, bwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    if( LAPACKE_lsame( sort, 's' ) ) {
        LAPACKE_free( bwork );
    }
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_sgges3", info );
    }
    return info;
}