/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include "mpitestconf.h"
#include <stdio.h>
#include "mpitest.h"

static char MTEST_Descrip[] = "Test MPI_MIN operations on optional datatypes dupported by MPICH2";

/*
 * This test looks at the handling of char and types that  are not required 
 * integers (e.g., long long).  MPICH2 allows
 * these as well.  A strict MPI test should not include this test.
 */
int main( int argc, char *argv[] )
{
    int errs = 0;
    int rank, size;
    MPI_Comm      comm;
    char cinbuf[3], coutbuf[3];
    unsigned char ucinbuf[3], ucoutbuf[3];

    MTest_Init( &argc, &argv );

    comm = MPI_COMM_WORLD;

    MPI_Comm_rank( comm, &rank );
    MPI_Comm_size( comm, &size );

    /* char */
    cinbuf[0] = 1;
    cinbuf[1] = 0;
    cinbuf[2] = (rank & 0x7f);

    coutbuf[0] = 0;
    coutbuf[1] = 1;
    coutbuf[2] = 1;
    MPI_Reduce( cinbuf, coutbuf, 3, MPI_CHAR, MPI_MIN, 0, comm );
    if (rank == 0) {
	if (coutbuf[0] != 1) {
	    errs++;
	    fprintf( stderr, "char MIN(1) test failed\n" );
	}
	if (coutbuf[1] != 0) {
	    errs++;
	    fprintf( stderr, "char MIN(0) test failed\n" );
	}
	if (coutbuf[2] != 0) {
	    errs++;
	    fprintf( stderr, "char MIN(>) test failed\n" );
	}
    }

    /* unsigned char */
    ucinbuf[0] = 1;
    ucinbuf[1] = 0;
    ucinbuf[2] = (rank & 0x7f);

    ucoutbuf[0] = 0;
    ucoutbuf[1] = 1;
    ucoutbuf[2] = 1;
    MPI_Reduce( ucinbuf, ucoutbuf, 3, MPI_UNSIGNED_CHAR, MPI_MIN, 0, comm );
    if (rank == 0) {
	if (ucoutbuf[0] != 1) {
	    errs++;
	    fprintf( stderr, "unsigned char MIN(1) test failed\n" );
	}
	if (ucoutbuf[1]) {
	    errs++;
	    fprintf( stderr, "unsigned char MIN(0) test failed\n" );
	}
	if (ucoutbuf[2] != 0) {
	    errs++;
	    fprintf( stderr, "unsigned char MIN(>) test failed\n" );
	}
    }

#ifdef HAVE_LONG_DOUBLE
    { long double ldinbuf[3], ldoutbuf[3];
    /* long double */
    ldinbuf[0] = 1;
    ldinbuf[1] = 0;
    ldinbuf[2] = rank;

    ldoutbuf[0] = 0;
    ldoutbuf[1] = 1;
    ldoutbuf[2] = 1;
    if (MPI_LONG_DOUBLE != MPI_DATATYPE_NULL) {
	MPI_Reduce( ldinbuf, ldoutbuf, 3, MPI_LONG_DOUBLE, MPI_MIN, 0, comm );
	if (rank == 0) {
	    if (ldoutbuf[0] != 1) {
		errs++;
		fprintf( stderr, "long double MIN(1) test failed\n" );
	    }
	    if (ldoutbuf[1] != 0.0) {
		errs++;
		fprintf( stderr, "long double MIN(0) test failed\n" );
	    }
	    if (ldoutbuf[2] != 0.0) {
		errs++;
		fprintf( stderr, "long double MIN(>) test failed\n" );
	    }
	}
    }
    }
#endif

#ifdef HAVE_LONG_LONG
    {
	long long llinbuf[3], lloutbuf[3];
    /* long long */
    llinbuf[0] = 1;
    llinbuf[1] = 0;
    llinbuf[2] = rank;

    lloutbuf[0] = 0;
    lloutbuf[1] = 1;
    lloutbuf[2] = 1;
    if (MPI_LONG_LONG != MPI_DATATYPE_NULL) {
	MPI_Reduce( llinbuf, lloutbuf, 3, MPI_LONG_LONG, MPI_MIN, 0, comm );
	if (rank == 0) {
	    if (lloutbuf[0] != 1) {
		errs++;
		fprintf( stderr, "long long MIN(1) test failed\n" );
	    }
	    if (lloutbuf[1] != 0) {
		errs++;
		fprintf( stderr, "long long MIN(0) test failed\n" );
	    }
	    if (lloutbuf[2] != 0) {
		errs++;
		fprintf( stderr, "long long MIN(>) test failed\n" );
	    }
	}
    }
    }
#endif

    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}
