/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2009 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <stdlib.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "A simple test of MPI_Op_create/commute/free";

*/

static int errs = 0;

/*

static void comm_user_op(void *invec, void *inoutvec, int *len, MPI_Datatype *datatype)

{

    user_op(invec, inoutvec, len, datatype);

}

*/

/*

static void noncomm_user_op(void *invec, void *inoutvec, int *len, MPI_Datatype *datatype)

{

    user_op(invec, inoutvec, len, datatype);

}

*/

static void user_op(void *invec, void *inoutvec, int *len, MPI_Datatype * datatype)

{

    int i;

    int *invec_int = (int *) invec;

    int *inoutvec_int = (int *) inoutvec;

    if (*datatype != MPI_INT) {

        ++errs;

        printf("invalid datatype passed to user_op");

        return;

    }

    for (i = 0; i < *len; ++i) {

        inoutvec_int[i] = invec_int[i] * 2 + inoutvec_int[i];

    }

}

int main(int argc, char *argv[])

{

    MPI_Op c_uop = MPI_OP_NULL;

    MPI_Op nc_uop = MPI_OP_NULL;

    int is_commutative = 0;

    MTest_Init(&argc, &argv);

    /* make sure that user-define ops work too */

    MPI_Op_create(&user_op, 1 /*commute */ , &c_uop);

    MPI_Op_create(&user_op, 0 /*!commute */ , &nc_uop);

#if MTEST_HAVE_MIN_MPI_VERSION(2,2)

    /* this function was added in MPI-2.2 */

#define CHECK_COMMUTATIVE(op_)                      \

    do {                                            \

        MPI_Op_commutative((op_), &is_commutative); \

        if (!is_commutative) { ++errs; }            \

    } while (0)

    /* Check all predefined reduction operations for commutivity.

     * This list is from section 5.9.2 of the MPI-2.1 standard */

    CHECK_COMMUTATIVE(MPI_MAX);

    CHECK_COMMUTATIVE(MPI_MIN);

    CHECK_COMMUTATIVE(MPI_SUM);

    CHECK_COMMUTATIVE(MPI_PROD);

    CHECK_COMMUTATIVE(MPI_LAND);

    CHECK_COMMUTATIVE(MPI_BAND);

    CHECK_COMMUTATIVE(MPI_LOR);

    CHECK_COMMUTATIVE(MPI_BOR);

    CHECK_COMMUTATIVE(MPI_LXOR);

    CHECK_COMMUTATIVE(MPI_BXOR);

    CHECK_COMMUTATIVE(MPI_MAXLOC);

    CHECK_COMMUTATIVE(MPI_MINLOC);

#undef CHECK_COMMUTATIVE

    MPI_Op_commutative(c_uop, &is_commutative);

    if (!is_commutative) {

        ++errs;

    }

    /* also check our non-commutative user defined operation */

    MPI_Op_commutative(nc_uop, &is_commutative);

    if (is_commutative) {

        ++errs;

    }

#endif

    MPI_Op_free(&nc_uop);

    MPI_Op_free(&c_uop);

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}