/*
** Copyright (C) 1995,2003-2004 Peter Schachte and The University of Melbourne.
** This file may only be copied under the terms of the GNU Library General
** Public License - see the file COPYING.LIB in the Mercury distribution.
*/

/*****************************************************************
    File   : test.c
    Author : Peter Schachte
    Origin : Tue Jun 20 15:51:07 1995
    Purpose: Timing test for bryant graph MR_ROBDD_iff_conj_array code

*****************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include "bryant.h"
#include "timing.h"


#define VARLIMIT 1024

int opcount;

void usage(char *progname)
    {
	printf("usage:  %s size maxvar [repetitions]\n", progname);
	printf("  creates all possible v <-> v1 & v2 & ... & vsize functions where v and\n");
	printf("  v and the vi are between 0 and maxvar inclusive.  If repetitions is >0,\n");
	printf("  this will be done that many times.\n");
    }


void init_array(int top, int v0, int array[])
    {
	int i, val;

	for (i=0, val=0; i<top; ++i, ++val) {
	    if (val==v0) ++val;
	    array[i] = val;
	}
    }



int next_array(int n, int varmax, int v0, int array[])
    {
	int i;
	int limit;
	int val;

	/* Search backward for first cell with "room" to be
	 * incremented.  This is complicated by the need to avoid
	 * using the value v0.
	 */
	for (i=n-1, limit=varmax-1;; --i, --limit) {
	    if (i<0) return 0;	/* no more combinations possible */
	    if (limit==v0) --limit;
	    if (++array[i]==v0) ++array[i];
	    if (array[i]<=limit) break;
	}
	/* Now we've incremented array[i], and must set
	 * array[i+1..n-1] to successive values (avoiding v0).
	 */
	for (val=array[i]+1, ++i; i<n; ++i, ++val) {
	    if (val==v0) ++val;
	    array[i] = val;
	}
	return 1;
    }


void doit(int v0, int top, int array[])
    {
	MR_ROBDD_type *f;
#ifdef DEBUGALL
	int i;

	printf("%d <-> ", v0);
	for (i=0; i<top; ++i) {
	    printf(" %d", array[i]);
	}
#endif /* DEBUGALL */
#ifndef OVERHEAD
	f = MR_ROBDD_iff_conj_array(v0, top, array);
#ifdef DEBUGALL
	printf(" ==> ");
	printOut(f);
	printf("\n");
#endif /* DEBUGALL */
#endif /* !OVERHEAD */
	++opcount;
    }

void dont_doit(int v0, int top, int array[])
    {
    }

int main(int argc, char **argv)
    {
	int varmax, size, repetitions;
	int array[VARLIMIT];
	int reps, v0;
	millisec clock0, clock1, clock2, clock3;
	float runtime, overhead, rate;
	int test_nodes, overhead_nodes;

	if (argc < 3) {
	    usage(argv[0]);
	    return 20;
	}
	if ((varmax=atoi(argv[2]))<1 || varmax>=VARLIMIT) {
	    usage(argv[0]);
	    printf("\n  varmax must be between 1 <= varmax < %d\n", VARLIMIT);
	    return 20;
	}
	if ((size=atoi(argv[1]))<0 || size>=varmax) {
	    usage(argv[0]);
	    printf("\n  size must be between 0 <= size < varmax\n");
	    return 20;
	}
	repetitions=(argc>3 ? atoi(argv[3]) : 1);
	if (repetitions <= 0) repetitions = 1;

	opcount = 0;
	clock0 = milli_time();
	for (reps=repetitions; reps>0; --reps) {
	    for (v0=0; v0<varmax; ++v0) {
		init_array(size, v0, array);
		doit(v0, size, array);
		while (next_array(size, varmax, v0, array)) {
		    doit(v0, size, array);
		}
	    }
	}
	clock1 = milli_time();
	test_nodes = MR_ROBDD_nodes_in_use();
	MR_ROBDD_initRep();
	clock2 = milli_time();
	for (reps=repetitions; reps>0; --reps) {
	    for (v0=0; v0<varmax; ++v0) {
		init_array(size, v0, array);
		dont_doit(v0, size, array);
		while (next_array(size, varmax, v0, array)) {
		    dont_doit(v0, size, array);
		}
	    }
	}
	clock3 = milli_time();
	overhead_nodes = MR_ROBDD_nodes_in_use();
	runtime = (float)(clock1-clock0)/1000;
	overhead = (float)(clock3-clock2)/1000;
	rate = ((float)opcount)/(runtime-overhead);
	printf("%s %d %d %d:  %.3f - %.3f = %.3f secs, %d ops, %d nodes, %.1f ops/sec\n",
	       argv[0], size, varmax, repetitions,
	       runtime, overhead, (runtime-overhead), opcount,
	       test_nodes-overhead_nodes, rate);
	return 0;
    }