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*****************************************************************************
* Contents: Native high-level C interface to LAPACK function dlarfb
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_dlarfb( int matrix_layout, char side, char trans, char direct,
                           char storev, lapack_int m, lapack_int n,
                           lapack_int k, const double* v, lapack_int ldv,
                           const double* t, lapack_int ldt, double* c,
                           lapack_int ldc )
{
    lapack_int info = 0;
    lapack_int ldwork;
    double* work = NULL;
    lapack_int nrows_v, ncols_v;
    lapack_logical left, col, forward;
    char uplo;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dlarfb", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        left = LAPACKE_lsame( side, 'l' );
        col = LAPACKE_lsame( storev, 'c' );
        forward = LAPACKE_lsame( direct, 'f' );

        nrows_v = ( col && left ) ? m : ( ( col && !left ) ? n : ( !col ? k : 1) );
        ncols_v = ( !col && left ) ? m : ( ( !col && !left ) ? n : ( col ? k : 1 ) );
        uplo = ( ( forward && col ) || !( forward || col ) ) ? 'l' : 'u';

        if( ( col && k > nrows_v ) || ( !col && k > ncols_v ) ) {
            LAPACKE_xerbla( "LAPACKE_dlarfb", -8 );
            return -8;
        }
        if( LAPACKE_dtz_nancheck( matrix_layout, direct, uplo, 'u',
                                  nrows_v, ncols_v, v, ldv ) ) {
            return -9;
        }
        if( LAPACKE_dge_nancheck( matrix_layout, k, k, t, ldt ) ) {
            return -11;
        }
        if( LAPACKE_dge_nancheck( matrix_layout, m, n, c, ldc ) ) {
            return -13;
        }
    }
#endif
    if( LAPACKE_lsame( side, 'l' ) ) {
        ldwork = n;
    } else if( LAPACKE_lsame( side, 'r' ) ) {
        ldwork = m;
    } else {
        ldwork = 1;
    }
    /* Allocate memory for working array(s) */
    work = (double*)LAPACKE_malloc( sizeof(double) * ldwork * MAX(1,k) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_dlarfb_work( matrix_layout, side, trans, direct, storev, m, n,
                                k, v, ldv, t, ldt, c, ldc, work, ldwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dlarfb", info );
    }
    return info;
}
