abcSaucy.c

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/**CFile****************************************************************

  FileName    [abcSaucy.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Symmetry Detection Package.]

  Synopsis    [Finds symmetries under permutation (but not negation) of I/Os.]

  Author      [Hadi Katebi]
  
  Affiliation [University of Michigan]

  Date        [Ver. 1.0. Started - April, 2012.]

  Revision    [No revisions so far]

  Comments    []                          

  Debugging   [There are some part of the code that are commented out. Those parts mostly print
               the contents of the data structures to the standard output. Un-comment them if you 
               find them useful for debugging.]

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

#include "base/abc/abc.h"
#include "opt/sim/sim.h"

ABC_NAMESPACE_IMPL_START

/* on/off switches */
#define REFINE_BY_SIM_1     0
#define REFINE_BY_SIM_2     0
#define BACKTRACK_BY_SAT    1
#define SELECT_DYNAMICALLY  0

/* number of iterations for sim1 and sim2 refinements */
int NUM_SIM1_ITERATION;
int NUM_SIM2_ITERATION;

/* conflict analysis */
#define CLAUSE_DECAY 0.9
#define MAX_LEARNTS  50

/*
 * saucy.c 
 *
 * by Paul T. Darga <pdarga@umich.edu>
 * and Mark Liffiton <liffiton@umich.edu>
 * and Hadi Katebi <hadik@eecs.umich.edu>
 * 
 * Copyright (C) 2004, The Regents of the University of Michigan
 * See the LICENSE file for details.
 */

struct saucy_stats {
    double grpsize_base;
    int grpsize_exp;
    int levels;
    int nodes;
    int bads;
    int gens;
    int support;
};

struct saucy_graph {
    int n;
    int e;
    int *adj;
    int *edg;
};

struct coloring {
    int *lab;        /* Labelling of objects */
    int *unlab;      /* Inverse of lab */
    int *cfront;     /* Pointer to front of cells */
    int *clen;       /* Length of cells (defined for cfront's) */
};

struct sim_result {
    int *inVec;
    int *outVec;
    int inVecSignature;
    int outVecOnes; 
    double activity;
};

struct saucy {
    /* Graph data */
    int n;           /* Size of domain */
    int *adj;        /* Neighbors of k: edg[adj[k]]..edg[adj[k+1]] */
    int *edg;        /* Actual neighbor data */
    int *dadj;       /* Fanin neighbor indices, for digraphs */
    int *dedg;       /* Fanin neighbor data, for digraphs */    

    /* Coloring data */
    struct coloring left, right;
    int *nextnon;    /* Forward next-nonsingleton pointers */ 
    int *prevnon;    /* Backward next-nonsingleton pointers */

    /* Refinement: inducers */
    char *indmark;   /* Induce marks */
    int *ninduce;    /* Nonsingletons that might induce refinement */
    int *sinduce;    /* Singletons that might induce refinement */
    int nninduce;    /* Size of ninduce stack */
    int nsinduce;    /* Size of sinduce stack */

    /* Refinement: marked cells */
    int *clist;      /* List of cells marked for refining */
    int csize;       /* Number of cells in clist */

    /* Refinement: workspace */
    char *stuff;     /* Bit vector, but one char per bit */
    int *ccount;     /* Number of connections to refining cell */
    int *bucket;     /* Workspace */
    int *count;      /* Num vertices with same adj count to ref cell */
    int *junk;       /* More workspace */
    int *gamma;      /* Working permutation */
    int *conncnts;   /* Connection counts for cell fronts */

    /* Search data */
    int lev;         /* Current search tree level */
    int anc;         /* Level of greatest common ancestor with zeta */
    int *anctar;     /* Copy of target cell at anc */
    int kanctar;     /* Location within anctar to iterate from */
    int *start;      /* Location of target at each level */
    int indmin;      /* Used for group size computation */
    int match;       /* Have we not diverged from previous left? */

    /* Search: orbit partition */
    int *theta;      /* Running approximation of orbit partition */
    int *thsize;     /* Size of cells in theta, defined for mcrs */
    int *thnext;     /* Next rep in list (circular list) */
    int *thprev;     /* Previous rep in list */
    int *threp;      /* First rep for a given cell front */
    int *thfront;    /* The cell front associated with this rep */

    /* Search: split record */
    int *splitvar;   /* The actual value of the splits on the left-most branch */
    int *splitwho;   /* List of where splits occurred */
    int *splitfrom;  /* List of cells which were split */
    int *splitlev;   /* Where splitwho/from begins for each level */
    int nsplits;     /* Number of splits at this point */

    /* Search: differences from leftmost */
    char *diffmark;  /* Marked for diff labels */
    int *diffs;      /* List of diff labels */
    int *difflev;    /* How many labels diffed at each level */
    int ndiffs;      /* Current number of diffs */
    int *undifflev;  /* How many diff labels fixed at each level */
    int nundiffs;    /* Current number of diffs in singletons (fixed) */
    int *unsupp;     /* Inverted diff array */
    int *specmin;    /* Speculated mappings */
    int *pairs;      /* Not-undiffed diffs that can make two-cycles */
    int *unpairs;    /* Indices into pairs */
    int npairs;      /* Number of such pairs */
    int *diffnons;   /* Diffs that haven't been undiffed */
    int *undiffnons; /* Inverse of that */
    int ndiffnons;   /* Number of such diffs */

    /* Polymorphic functions */
    int (*split)(struct saucy *, struct coloring *, int, int);
    int (*is_automorphism)(struct saucy *);
    int (*ref_singleton)(struct saucy *, struct coloring *, int);
    int (*ref_nonsingle)(struct saucy *, struct coloring *, int);
    void (*select_decomposition)(struct saucy *, int *, int *, int *);

     /* Statistics structure */
    struct saucy_stats *stats;

    /* New data structures for Boolean formulas */
    Abc_Ntk_t * pNtk;
    Abc_Ntk_t * pNtk_permuted;
    int * depAdj;
    int * depEdg;
    Vec_Int_t ** iDep, ** oDep;
    Vec_Int_t ** obs, ** ctrl;  
    Vec_Ptr_t ** topOrder;
    Vec_Ptr_t * randomVectorArray_sim1;
    int * randomVectorSplit_sim1;
    Vec_Ptr_t * randomVectorArray_sim2;
    int * randomVectorSplit_sim2;
    char * marks;
    int * pModel;
    Vec_Ptr_t * satCounterExamples;
    double activityInc;

    int fBooleanMatching;
    int fPrintTree;
    int fLookForSwaps;
    FILE * gFile;
    
    int (*refineBySim1)(struct saucy *, struct coloring *);
    int (*refineBySim2)(struct saucy *, struct coloring *);
    int (*print_automorphism)(FILE *f, int n, const int *gamma, int nsupp, const int *support, char * marks, Abc_Ntk_t * pNtk);
};

static int  *ints(int n) { return ABC_ALLOC(int, n); }
static int  *zeros(int n) { return ABC_CALLOC(int, n); }
static char *bits(int n) { return ABC_CALLOC(char, n); }

static char *               getVertexName(Abc_Ntk_t *pNtk, int v);
static int *                generateProperInputVector(Abc_Ntk_t * pNtk, struct coloring *c, Vec_Int_t * randomVector);
static int                  ifInputVectorsAreConsistent(struct saucy * s, int * leftVec, int * rightVec);
static int                  ifOutputVectorsAreConsistent(struct saucy * s, int * leftVec, int * rightVec);
static Vec_Ptr_t **         findTopologicalOrder(Abc_Ntk_t * pNtk);
static void                 getDependencies(Abc_Ntk_t *pNtk, Vec_Int_t** iDep, Vec_Int_t** oDep);
static struct saucy_graph * buildDepGraph (Abc_Ntk_t *pNtk, Vec_Int_t ** iDep, Vec_Int_t ** oDep);
static struct saucy_graph * buildSim1Graph(Abc_Ntk_t * pNtk, struct coloring *c, Vec_Int_t * randVec, Vec_Int_t ** iDep, Vec_Int_t ** oDep);
static struct saucy_graph * buildSim2Graph(Abc_Ntk_t * pNtk, struct coloring *c, Vec_Int_t * randVec, Vec_Int_t ** iDep, Vec_Int_t ** oDep, Vec_Ptr_t ** topOrder, Vec_Int_t ** obs,  Vec_Int_t ** ctrl);
static Vec_Int_t *          assignRandomBitsToCells(Abc_Ntk_t * pNtk, struct coloring *c);
static int                  Abc_NtkCecSat_saucy(Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int * pModel);
static struct sim_result *  analyzeConflict(Abc_Ntk_t * pNtk, int * pModel, int fVerbose);
static void                 bumpActivity (struct saucy * s, struct sim_result * cex);
static void                 reduceDB(struct saucy * s);


static int
print_automorphism_ntk(FILE *f, int n, const int *gamma, int nsupp, const int *support, char * marks, Abc_Ntk_t * pNtk)
{
    int i, j, k;    

    /* We presume support is already sorted */
    for (i = 0; i < nsupp; ++i) {
        k = support[i];

        /* Skip elements already seen */
        if (marks[k]) continue;

        /* Start an orbit */
        marks[k] = 1;
        fprintf(f, "(%s", getVertexName(pNtk, k));

        /* Mark and notify elements in this orbit */
        for (j = gamma[k]; j != k; j = gamma[j]) {
            marks[j] = 1;
            fprintf(f, " %s", getVertexName(pNtk, j));
        }

        /* Finish off the orbit */
        fprintf(f, ")");
    }
    fprintf(f, "\n");

    /* Clean up after ourselves */
    for (i = 0; i < nsupp; ++i) {
        marks[support[i]] = 0;
    }

    return 1;
}

static int
print_automorphism_ntk2(FILE *f, int n, const int *gamma, int nsupp, const int *support, char * marks, Abc_Ntk_t * pNtk)
{
    int i, j, k;    

    /* We presume support is already sorted */
    for (i = 0; i < nsupp; ++i) {
        k = support[i];

        /* Skip elements already seen */
        if (marks[k]) continue;

        /* Start an orbit */
        marks[k] = 1;
        fprintf(f, "%d", k-1);

        /* Mark and notify elements in this orbit */
        for (j = gamma[k]; j != k; j = gamma[j]) {
            marks[j] = 1;
            fprintf(f, " %d ", j-1);
        }

        /* Finish off the orbit */      
    }
    fprintf(f, "-1\n");

    /* Clean up after ourselves */
    for (i = 0; i < nsupp; ++i) {
        marks[support[i]] = 0;
    }

    return 1;
}

static int
print_automorphism_quiet(FILE *f, int n, const int *gamma, int nsupp, const int *support, char * marks, Abc_Ntk_t * pNtk)
{   
    return 1;
}

static int
array_find_min(const int *a, int n)
{
    const int *start = a, *end = a + n, *min = a;
    while (++a != end) {
        if (*a < *min) min = a;
    }
    return min - start;
}

static void
swap(int *a, int x, int y)
{
    int tmp = a[x];
    a[x] = a[y];
    a[y] = tmp;
}

static void
sift_up(int *a, int k)
{
    int p;
    do {
        p = k / 2;
        if (a[k] <= a[p]) {
            return;
        }
        else {
            swap(a, k, p);
            k = p;
        }
    } while (k > 1);
}

static void
sift_down(int *a, int n)
{
    int p = 1, k = 2;
    while (k <= n) {
        if (k < n && a[k] < a[k+1]) ++k;
        if (a[p] < a[k]) {
            swap(a, p, k);
            p = k;
            k = 2 * p;
        }
        else {
            return;
        }
    }
}

static void
heap_sort(int *a, int n)
{
    int i;
    for (i = 1; i < n; ++i) {
        sift_up(a-1, i+1);
    }
    --i;
    while (i > 0) {
        swap(a, 0, i);
        sift_down(a-1, i--);
    }
}

static void
insertion_sort(int *a, int n)
{
    int i, j, k;
    for (i = 1; i < n; ++i) {
        k = a[i];
        for (j = i; j > 0 && a[j-1] > k; --j) {
            a[j] = a[j-1];
        }
        a[j] = k;
    }
}

static int
partition(int *a, int n, int m)
{
    int f = 0, b = n;
    for (;;) {
        while (a[f] <= m) ++f;
        do  --b; while (m <= a[b]);
        if (f < b) {
            swap(a, f, b);
            ++f;
        }
        else break;
    }
    return f;
}

static int
log_base2(int n)
{
    int k = 0;
    while (n > 1) {
        ++k;
        n >>= 1;
    }
    return k;
}

static int
median(int a, int b, int c)
{
    if (a <= b) {
        if (b <= c) return b;
        if (a <= c) return c;
        return a;
    }
    else {
        if (a <= c) return a;
        if (b <= c) return c;
        return b;
    }
}

static void
introsort_loop(int *a, int n, int lim)
{
    int p;
    while (n > 16) {
        if (lim == 0) {
            heap_sort(a, n);
            return;
        }
        --lim;
        p = partition(a, n, median(a[0], a[n/2], a[n-1]));
        introsort_loop(a + p, n - p, lim);
        n = p;
    }
}

static void
introsort(int *a, int n)
{
    introsort_loop(a, n, 2 * log_base2(n));
    insertion_sort(a, n);
}

static int
do_find_min(struct coloring *c, int t)
{
    return array_find_min(c->lab + t, c->clen[t] + 1) + t;
}

static int
find_min(struct saucy *s, int t)
{
    return do_find_min(&s->right, t);
}

static void
set_label(struct coloring *c, int index, int value)
{
    c->lab[index] = value;
    c->unlab[value] = index;
}

static void
swap_labels(struct coloring *c, int a, int b)
{
    int tmp = c->lab[a];
    set_label(c, a, c->lab[b]);
    set_label(c, b, tmp);
}

static void
move_to_back(struct saucy *s, struct coloring *c, int k)
{
    int cf = c->cfront[k];
    int cb = cf + c->clen[cf];
    int offset = s->conncnts[cf]++;

    /* Move this connected label to the back of its cell */
    swap_labels(c, cb - offset, c->unlab[k]);

    /* Add it to the cell list if it's the first one swapped */
    if (!offset) s->clist[s->csize++] = cf;
}

static void
data_mark(struct saucy *s, struct coloring *c, int k)
{
    int cf = c->cfront[k];

    /* Move connects to the back of nonsingletons */
    if (c->clen[cf]) move_to_back(s, c, k);
}

static void
data_count(struct saucy *s, struct coloring *c, int k)
{
    int cf = c->cfront[k];

    /* Move to back and count the number of connections */
    if (c->clen[cf] && !s->ccount[k]++) move_to_back(s, c, k);
}

static int
check_mapping(struct saucy *s, const int *adj, const int *edg, int k)
{
    int i, gk, ret = 1;

    /* Mark gamma of neighbors */
    for (i = adj[k]; i != adj[k+1]; ++i) {
        s->stuff[s->gamma[edg[i]]] = 1;
    }

    /* Check neighbors of gamma */
    gk = s->gamma[k];
    for (i = adj[gk]; ret && i != adj[gk+1]; ++i) {
        ret = s->stuff[edg[i]];
    }

    /* Clear out bit vector before we leave */
    for (i = adj[k]; i != adj[k+1]; ++i) {
        s->stuff[s->gamma[edg[i]]] = 0;
    }

    return ret;
}

static int
add_conterexample(struct saucy *s, struct sim_result * cex)
{
    int i;
    int nins = Abc_NtkPiNum(s->pNtk);
    struct sim_result * savedcex;
    
    cex->inVecSignature = 0;
    for (i = 0; i < nins; i++) {
        if (cex->inVec[i]) {
            cex->inVecSignature += (cex->inVec[i] * i * i);
            cex->inVecSignature ^= 0xABCD;
        }
    }

    for (i = 0; i < Vec_PtrSize(s->satCounterExamples); i++) {
        savedcex = (struct sim_result *)Vec_PtrEntry(s->satCounterExamples, i);
        if (savedcex->inVecSignature == cex->inVecSignature) {
            //bumpActivity(s, savedcex);
            return 0;
        }
    }
    
    Vec_PtrPush(s->satCounterExamples, cex);
    bumpActivity(s, cex);
    return 1;
}

static int
is_undirected_automorphism(struct saucy *s)
{
    int i, j, ret;  

    for (i = 0; i < s->ndiffs; ++i) {
        j = s->unsupp[i];
        if (!check_mapping(s, s->adj, s->edg, j)) return 0;
    }

    ret = Abc_NtkCecSat_saucy(s->pNtk, s->pNtk_permuted, s->pModel);
    
    if( BACKTRACK_BY_SAT && !ret ) {
        struct sim_result * cex;

        cex = analyzeConflict( s->pNtk, s->pModel, s->fPrintTree );
        add_conterexample(s, cex);

        cex = analyzeConflict( s->pNtk_permuted, s->pModel, s->fPrintTree );
        add_conterexample(s, cex);      
        
        s->activityInc *= (1 / CLAUSE_DECAY);
        if (Vec_PtrSize(s->satCounterExamples) >= MAX_LEARNTS)
            reduceDB(s);
    }

    return ret;
}

static int
is_directed_automorphism(struct saucy *s)
{
    int i, j;

    for (i = 0; i < s->ndiffs; ++i) {
        j = s->unsupp[i];
        if (!check_mapping(s, s->adj, s->edg, j)) return 0;
        if (!check_mapping(s, s->dadj, s->dedg, j)) return 0;
    }
    return 1;
}

static void
add_induce(struct saucy *s, struct coloring *c, int who)
{
    if (!c->clen[who]) {
        s->sinduce[s->nsinduce++] = who;
    }
    else {
        s->ninduce[s->nninduce++] = who;
    }
    s->indmark[who] = 1;
}

static void
fix_fronts(struct coloring *c, int cf, int ff)
{
    int i, end = cf + c->clen[cf];
    for (i = ff; i <= end; ++i) {
        c->cfront[c->lab[i]] = cf;
    }
}

static void
array_indirect_sort(int *a, const int *b, int n)
{
    int h, i, j, k;

    /* Shell sort, as implemented in nauty, (C) Brendan McKay */
    j = n / 3;
    h = 1;
    do { h = 3 * h + 1; } while (h < j);

    do {
        for (i = h; i < n; ++i) {
            k = a[i];
            for (j = i; b[a[j-h]] > b[k]; ) {
                a[j] = a[j-h];
                if ((j -= h) < h) break;
            }
            a[j] = k;
        }
        h /= 3;
    } while (h > 0);
}

static int
at_terminal(struct saucy *s)
{
    return s->nsplits == s->n;
}

static void
add_diffnon(struct saucy *s, int k)
{
    /* Only add if we're in a consistent state */
    if (s->ndiffnons == -1) return;

    s->undiffnons[k] = s->ndiffnons;
    s->diffnons[s->ndiffnons++] = k;
}

static void
remove_diffnon(struct saucy *s, int k)
{
    int j;

    if (s->undiffnons[k] == -1) return;

    j = s->diffnons[--s->ndiffnons];
    s->diffnons[s->undiffnons[k]] = j;
    s->undiffnons[j] = s->undiffnons[k];

    s->undiffnons[k] = -1;
}

static void
add_diff(struct saucy *s, int k)
{
    if (!s->diffmark[k]) {
        s->diffmark[k] = 1;
        s->diffs[s->ndiffs++] = k;
        add_diffnon(s, k);
    }
}

static int
is_a_pair(struct saucy *s, int k)
{
    return s->unpairs[k] != -1;
}

static int
in_cell_range(struct coloring *c, int ff, int cf)
{
    int cb = cf + c->clen[cf];
    return cf <= ff && ff <= cb;
}

static void
add_pair(struct saucy *s, int k)
{
    if (s->npairs != -1) {
        s->unpairs[k] = s->npairs;
        s->pairs[s->npairs++] = k;
    }
}

static void
eat_pair(struct saucy *s, int k)
{
    int j;
    j = s->pairs[--s->npairs];
    s->pairs[s->unpairs[k]] = j;
    s->unpairs[j] = s->unpairs[k];
    s->unpairs[k] = -1;
}

static void
pick_all_the_pairs(struct saucy *s)
{
    int i;
    for (i = 0; i < s->npairs; ++i) {
        s->unpairs[s->pairs[i]] = -1;
    }
    s->npairs = 0;
}

static void
clear_undiffnons(struct saucy *s)
{
    int i;
    for (i = 0 ; i < s->ndiffnons ; ++i) {
        s->undiffnons[s->diffnons[i]] = -1;
    }
}

static void
fix_diff_singleton(struct saucy *s, int cf)
{
    int r = s->right.lab[cf];
    int l = s->left.lab[cf];
    int rcfl;

    if (!s->right.clen[cf] && r != l) {

        /* Make sure diff is marked */
        add_diff(s, r);

        /* It is now undiffed since it is singleton */
        ++s->nundiffs;
        remove_diffnon(s, r);

        /* Mark the other if not singleton already */
        rcfl = s->right.cfront[l];
        if (s->right.clen[rcfl]) {
            add_diff(s, l);

            /* Check for pairs */
            if (in_cell_range(&s->right, s->left.unlab[r], rcfl)) {
                add_pair(s, l);
            }
        }
        /* Otherwise we might be eating a pair */
        else if (is_a_pair(s, r)) {
            eat_pair(s, r);
        }
    }
}

static void
fix_diff_subtract(struct saucy *s, int cf, const int *a, const int *b)
{
    int i, k;
    int cb = cf + s->right.clen[cf];

    /* Mark the contents of the first set */
    for (i = cf; i <= cb; ++i) {
        s->stuff[a[i]] = 1;
    }

    /* Add elements from second set not present in the first */
    for (i = cf; i <= cb; ++i) {
        k = b[i];
        if (!s->stuff[k]) add_diff(s, k);
    }

    /* Clear the marks of the first set */
    for (i = cf; i <= cb; ++i) {
        s->stuff[a[i]] = 0;
    }
}

static void
fix_diffs(struct saucy *s, int cf, int ff)
{
    int min;

    /* Check for singleton cases in both cells */
    fix_diff_singleton(s, cf);
    fix_diff_singleton(s, ff);

    /* If they're both nonsingleton, do subtraction on smaller */
    if (s->right.clen[cf] && s->right.clen[ff]) {
        min = s->right.clen[cf] < s->right.clen[ff] ? cf : ff;
        fix_diff_subtract(s, min, s->left.lab, s->right.lab);
        fix_diff_subtract(s, min, s->right.lab, s->left.lab);
    }
}

static void
split_color(struct coloring *c, int cf, int ff)
{
    int cb, fb;

    /* Fix lengths */
    fb = ff - 1;
    cb = cf + c->clen[cf];
    c->clen[cf] = fb - cf;
    c->clen[ff] = cb - ff;

    /* Fix cell front pointers */
    fix_fronts(c, ff, ff);
}

static void
split_common(struct saucy *s, struct coloring *c, int cf, int ff)
{
    split_color(c, cf, ff);

    /* Add to refinement */
    if (s->indmark[cf] || c->clen[ff] < c->clen[cf]) {
        add_induce(s, c, ff);
    }
    else {
        add_induce(s, c, cf);
    }
}

static int
split_left(struct saucy *s, struct coloring *c, int cf, int ff)
{
    /* Record the split */
    s->splitwho[s->nsplits] = ff;
    s->splitfrom[s->nsplits] = cf;
    ++s->nsplits;

    /* Do common splitting tasks */
    split_common(s, c, cf, ff);

    /* Always succeeds */
    return 1;
}

static int
split_init(struct saucy *s, struct coloring *c, int cf, int ff)
{
    split_left(s, c, cf, ff);

    /* Maintain nonsingleton list for finding new targets */
    if (c->clen[ff]) {
        s->prevnon[s->nextnon[cf]] = ff;
        s->nextnon[ff] = s->nextnon[cf];
        s->prevnon[ff] = cf;
        s->nextnon[cf] = ff;
    }
    if (!c->clen[cf]) {
        s->nextnon[s->prevnon[cf]] = s->nextnon[cf];
        s->prevnon[s->nextnon[cf]] = s->prevnon[cf];
    }

    /* Always succeeds */
    return 1;
}

static int
split_other(struct saucy *s, struct coloring *c, int cf, int ff)
{
    int k = s->nsplits;

    /* Verify the split with init */
    if (s->splitwho[k] != ff || s->splitfrom[k] != cf
            || k >= s->splitlev[s->lev]) {
        return 0;
    }
    ++s->nsplits;

    /* Do common splitting tasks */
    split_common(s, c, cf, ff);

    /* Fix differences with init */
    fix_diffs(s, cf, ff);

    /* If we got this far we succeeded */
    return 1;
}

static int
print_partition(struct coloring *left, struct coloring *right, int n, Abc_Ntk_t * pNtk, int fNames)
{
        int i, j;        

        printf("top = |");
        for(i = 0; i < n; i += (left->clen[i]+1)) {
            for(j = 0; j < (left->clen[i]+1); j++) {
                if (fNames) printf("%s ", getVertexName(pNtk, left->lab[i+j]));
                else        printf("%d ", left->lab[i+j]);
            }
            if((i+left->clen[i]+1) < n) printf("|");
        }
        printf("|\n");

        /*printf("(cfront = {");
        for (i = 0; i < n; i++)
            printf("%d ", left->cfront[i]);
        printf("})\n");*/

        if (right == NULL) return 1;

        printf("bot = |");
        for(i = 0; i < n; i += (right->clen[i]+1)) {
            for(j = 0; j < (right->clen[i]+1); j++) {
                if (fNames) printf("%s ", getVertexName(pNtk, right->lab[i+j]));
                else        printf("%d ", right->lab[i+j]);
            }
            if((i+right->clen[i]+1) < n) printf("|");
        }
        printf("|\n");

        /*printf("(cfront = {");
        for (i = 0; i < n; i++)
            printf("%d ", right->cfront[i]);
        printf("})\n");*/

        return 1;
}

static int
refine_cell(struct saucy *s, struct coloring *c,
    int (*refine)(struct saucy *, struct coloring *, int))
{
    int i, cf, ret = 1;

    /*
     * The connected list must be consistent.  This is for
     * detecting mappings across nodes at a given level.  However,
     * at the root of the tree, we never have to map with another
     * node, so we lack this consistency constraint in that case.
     */
    if (s->lev > 1) introsort(s->clist, s->csize);

    /* Now iterate over the marked cells */
    for (i = 0; ret && i < s->csize; ++i) {
        cf = s->clist[i];
        ret = refine(s, c, cf);
    }

    /* Clear the connected marks */
    for (i = 0; i < s->csize; ++i) {
        cf = s->clist[i];
        s->conncnts[cf] = 0;
    }
    s->csize = 0;
    return ret;
}

static int
maybe_split(struct saucy *s, struct coloring *c, int cf, int ff)
{
    return cf == ff ? 1 : s->split(s, c, cf, ff);
}

static int
ref_single_cell(struct saucy *s, struct coloring *c, int cf)
{
    int zcnt = c->clen[cf] + 1 - s->conncnts[cf];
    return maybe_split(s, c, cf, cf + zcnt);
}

static int
ref_singleton(struct saucy *s, struct coloring *c,
    const int *adj, const int *edg, int cf)
{
    int i, k = c->lab[cf];

    /* Find the cells we're connected to, and mark our neighbors */
    for (i = adj[k]; i != adj[k+1]; ++i) {
        data_mark(s, c, edg[i]);
    }

    /* Refine the cells we're connected to */
    return refine_cell(s, c, ref_single_cell);
}

static int
ref_singleton_directed(struct saucy *s, struct coloring *c, int cf)
{
    return ref_singleton(s, c, s->adj, s->edg, cf)
        && ref_singleton(s, c, s->dadj, s->dedg, cf);
}

static int
ref_singleton_undirected(struct saucy *s, struct coloring *c, int cf)
{
    return ref_singleton(s, c, s->adj, s->edg, cf);
}

static int
ref_nonsingle_cell(struct saucy *s, struct coloring *c, int cf)
{
    int cnt, i, cb, nzf, ff, fb, bmin, bmax;

    /* Find the front and back */
    cb = cf + c->clen[cf];
    nzf = cb - s->conncnts[cf] + 1;

    /* Prepare the buckets */
    ff = nzf;
    cnt = s->ccount[c->lab[ff]];
    s->count[ff] = bmin = bmax = cnt;
    s->bucket[cnt] = 1;

    /* Iterate through the rest of the vertices */
    while (++ff <= cb) {
        cnt = s->ccount[c->lab[ff]];

        /* Initialize intermediate buckets */
        while (bmin > cnt) s->bucket[--bmin] = 0;
        while (bmax < cnt) s->bucket[++bmax] = 0;

        /* Mark this count */
        ++s->bucket[cnt];
        s->count[ff] = cnt;
    }

    /* If they all had the same count, bail */
    if (bmin == bmax && cf == nzf) return 1;
    ff = fb = nzf;

    /* Calculate bucket locations, sizes */
    for (i = bmin; i <= bmax; ++i, ff = fb) {
        if (!s->bucket[i]) continue;
        fb = ff + s->bucket[i];
        s->bucket[i] = fb;
    }

    /* Repair the partition nest */
    for (i = nzf; i <= cb; ++i) {
        s->junk[--s->bucket[s->count[i]]] = c->lab[i];
    }
    for (i = nzf; i <= cb; ++i) {
        set_label(c, i, s->junk[i]);
    }

    /* Split; induce */
    for (i = bmax; i > bmin; --i) {
        ff = s->bucket[i];
        if (ff && !s->split(s, c, cf, ff)) return 0;
    }

    /* If there was a zero area, then there's one more cell */
    return maybe_split(s, c, cf, s->bucket[bmin]);
}

static int
ref_nonsingle(struct saucy *s, struct coloring *c,
    const int *adj, const int *edg, int cf)
{
    int i, j, k, ret;
    const int cb = cf + c->clen[cf];
    const int size = cb - cf + 1;

    /* Double check for nonsingles which became singles later */
    if (cf == cb) {
        return ref_singleton(s, c, adj, edg, cf);
    }

    /* Establish connected list */
    memcpy(s->junk, c->lab + cf, size * sizeof(int));
    for (i = 0; i < size; ++i) {
        k = s->junk[i];
        for (j = adj[k]; j != adj[k+1]; ++j) {
            data_count(s, c, edg[j]);
        }
    }

    /* Refine the cells we're connected to */
    ret = refine_cell(s, c, ref_nonsingle_cell);

    /* Clear the counts; use lab because junk was overwritten */
    for (i = cf; i <= cb; ++i) {
        k = c->lab[i];
        for (j = adj[k]; j != adj[k+1]; ++j) {
            s->ccount[edg[j]] = 0;
        }
    }

    return ret;
}

static int
ref_nonsingle_directed(struct saucy *s, struct coloring *c, int cf)
{
    return ref_nonsingle(s, c, s->adj, s->edg, cf)
        && ref_nonsingle(s, c, s->dadj, s->dedg, cf);
}

static int
ref_nonsingle_undirected(struct saucy *s, struct coloring *c, int cf)
{
    return ref_nonsingle(s, c, s->adj, s->edg, cf);
}

static void
clear_refine(struct saucy *s)
{
    int i;
    for (i = 0; i < s->nninduce; ++i) {
        s->indmark[s->ninduce[i]] = 0;
    }
    for (i = 0; i < s->nsinduce; ++i) {
        s->indmark[s->sinduce[i]] = 0;
    }
    s->nninduce = s->nsinduce = 0;
}

static int
refine(struct saucy *s, struct coloring *c)
{
    int front;

    /* Keep going until refinement stops */
    while (1) {

        /* If discrete, bail */
        if (at_terminal(s)) {
            clear_refine(s);
            return 1;
        };

        /* Look for something else to refine on */
        if (s->nsinduce) {
            front = s->sinduce[--s->nsinduce];
            s->indmark[front] = 0;
            if (!s->ref_singleton(s, c, front)) break;
        }
        else if (s->nninduce) {
            front = s->ninduce[--s->nninduce];
            s->indmark[front] = 0;
            if (!s->ref_nonsingle(s, c, front)) break;
        }
        else {
            return 1;
        };
    }

    clear_refine(s);
    return 0;
}

static int
refineByDepGraph(struct saucy *s, struct coloring *c) 
{
    s->adj = s->depAdj;
    s->edg = s->depEdg; 

    return refine(s, c);
}

static int
backtrackBysatCounterExamples(struct saucy *s, struct coloring *c)
{
    int i, j, res;  
    struct sim_result * cex1, * cex2;
    int * flag = zeros(Vec_PtrSize(s->satCounterExamples));

    if (c == &s->left) return 1;
    if (Vec_PtrSize(s->satCounterExamples) == 0) return 1;      

    for (i = 0; i < Vec_PtrSize(s->satCounterExamples); i++) {  
        cex1 = (struct sim_result *)Vec_PtrEntry(s->satCounterExamples, i);      

        for (j = 0; j < Vec_PtrSize(s->satCounterExamples); j++) {
            if (flag[j]) continue;
        
            cex2 = (struct sim_result *)Vec_PtrEntry(s->satCounterExamples, j);
            res = ifInputVectorsAreConsistent(s, cex1->inVec, cex2->inVec);

            if (res == -2) {
                flag[j] = 1;
                continue;
            }
            if (res == -1) break;
            if (res == 0) continue;

            if (cex1->outVecOnes != cex2->outVecOnes) {
                bumpActivity(s, cex1);
                bumpActivity(s, cex2);
                ABC_FREE(flag);
                return 0;
            }

            /* if two input vectors produce the same number of ones (look above), and
             * pNtk's number of outputs is 1, then output vectors are definitely consistent. */
            if (Abc_NtkPoNum(s->pNtk) == 1) continue;

            if (!ifOutputVectorsAreConsistent(s, cex1->outVec, cex2->outVec)) {
                bumpActivity(s, cex1);
                bumpActivity(s, cex2);
                ABC_FREE(flag);
                return 0;
            }
        }
    }

    ABC_FREE(flag);
    return 1;
}

static int
refineBySim1_init(struct saucy *s, struct coloring *c) 
{
    struct saucy_graph *g;
    Vec_Int_t * randVec;
    int i, j;
    int allOutputsAreDistinguished;
    int nsplits;

    if (Abc_NtkPoNum(s->pNtk) == 1) return 1;
    
    for (i = 0; i < NUM_SIM1_ITERATION; i++) {

        /* if all outputs are distinguished, quit */
        allOutputsAreDistinguished = 1;
        for (j = 0; j < Abc_NtkPoNum(s->pNtk); j++) {
            if (c->clen[j]) {
                allOutputsAreDistinguished = 0;
                break;
            }
        }
        if (allOutputsAreDistinguished) break;

        randVec = assignRandomBitsToCells(s->pNtk, c);      
        g = buildSim1Graph(s->pNtk, c, randVec, s->iDep, s->oDep);
        assert(g != NULL);

        s->adj = g->adj;
        s->edg = g->edg;

        nsplits = s->nsplits;

        for (j = 0; j < s->n; j += c->clen[j]+1)            
                add_induce(s, c, j);
        refine(s, c);

        if (s->nsplits > nsplits) {         
            i = 0; /* reset i */
            /* do more refinement by dependency graph */
            for (j = 0; j < s->n; j += c->clen[j]+1)                
                    add_induce(s, c, j);
            refineByDepGraph(s, c);
        }
        
        Vec_IntFree(randVec);
        ABC_FREE( g->adj );
        ABC_FREE( g->edg );
        ABC_FREE( g );
    }   

    return 1;
}


static int
refineBySim1_left(struct saucy *s, struct coloring *c) 
{
    struct saucy_graph *g;
    Vec_Int_t * randVec;
    int i, j;
    int allOutputsAreDistinguished;
    int nsplits;

    if (Abc_NtkPoNum(s->pNtk) == 1) return 1;
    
    for (i = 0; i < NUM_SIM1_ITERATION; i++) {

        /* if all outputs are distinguished, quit */
        allOutputsAreDistinguished = 1;
        for (j = 0; j < Abc_NtkPoNum(s->pNtk); j++) {
            if (c->clen[j]) {
                allOutputsAreDistinguished = 0;
                break;
            }
        }
        if (allOutputsAreDistinguished) break;

        randVec = assignRandomBitsToCells(s->pNtk, c);      
        g = buildSim1Graph(s->pNtk, c, randVec, s->iDep, s->oDep);
        assert(g != NULL);

        s->adj = g->adj;
        s->edg = g->edg;

        nsplits = s->nsplits;

        for (j = 0; j < s->n; j += c->clen[j]+1)            
                add_induce(s, c, j);
        refine(s, c);

        if (s->nsplits > nsplits) {
            /* save the random vector */
            Vec_PtrPush(s->randomVectorArray_sim1, randVec);            
            i = 0;  /* reset i */
            /* do more refinement by dependency graph */
            for (j = 0; j < s->n; j += c->clen[j]+1)                
                    add_induce(s, c, j);
            refineByDepGraph(s, c);
        }
        else
            Vec_IntFree(randVec);

        ABC_FREE( g->adj );
        ABC_FREE( g->edg );
        ABC_FREE( g );
    }

    s->randomVectorSplit_sim1[s->lev] = Vec_PtrSize(s->randomVectorArray_sim1); 

    return 1;
}

static int
refineBySim1_other(struct saucy *s, struct coloring *c) 
{
    struct saucy_graph *g;
    Vec_Int_t * randVec;
    int i, j;
    int ret, nsplits;

    for (i = s->randomVectorSplit_sim1[s->lev-1]; i < s->randomVectorSplit_sim1[s->lev]; i++) {
        randVec = (Vec_Int_t *)Vec_PtrEntry(s->randomVectorArray_sim1, i);
        g = buildSim1Graph(s->pNtk, c, randVec, s->iDep, s->oDep);

        if (g == NULL) {
            assert(c == &s->right);
            return 0;
        }

        s->adj = g->adj;
        s->edg = g->edg;

        nsplits = s->nsplits;

        for (j = 0; j < s->n; j += c->clen[j]+1)            
                add_induce(s, c, j);
        ret = refine(s, c);

        if (s->nsplits == nsplits) {
            assert(c == &s->right);
            ret = 0;
        }

        if (ret) {      
            /* do more refinement now by dependency graph */
            for (j = 0; j < s->n; j += c->clen[j]+1)                
                    add_induce(s, c, j);
            ret = refineByDepGraph(s, c);
        }
        
        ABC_FREE( g->adj );
        ABC_FREE( g->edg );
        ABC_FREE( g );

        if (!ret) return 0;
    }   

    return 1;
}

static int
refineBySim2_init(struct saucy *s, struct coloring *c) 
{
    struct saucy_graph *g;
    Vec_Int_t * randVec;    
    int i, j;
    int nsplits;    
    
    for (i = 0; i < NUM_SIM2_ITERATION; i++) {
        randVec = assignRandomBitsToCells(s->pNtk, c);      
        g = buildSim2Graph(s->pNtk, c, randVec, s->iDep, s->oDep, s->topOrder, s->obs,  s->ctrl);
        assert(g != NULL);

        s->adj = g->adj;
        s->edg = g->edg;

        nsplits = s->nsplits;
        
        for (j = 0; j < s->n; j += c->clen[j]+1)            
                add_induce(s, c, j);
        refine(s, c);

        if (s->nsplits > nsplits) {                     
            i = 0; /* reset i */
            /* do more refinement by dependency graph */
            for (j = 0; j < s->n; j += c->clen[j]+1)                
                    add_induce(s, c, j);
            refineByDepGraph(s, c);
        }
        
        Vec_IntFree(randVec);
        
        ABC_FREE( g->adj );
        ABC_FREE( g->edg );
        ABC_FREE( g );
    }

    return 1;
}

static int
refineBySim2_left(struct saucy *s, struct coloring *c) 
{
    struct saucy_graph *g;
    Vec_Int_t * randVec;    
    int i, j;
    int nsplits;    
    
    for (i = 0; i < NUM_SIM2_ITERATION; i++) {
        randVec = assignRandomBitsToCells(s->pNtk, c);      
        g = buildSim2Graph(s->pNtk, c, randVec, s->iDep, s->oDep, s->topOrder, s->obs,  s->ctrl);
        assert(g != NULL);

        s->adj = g->adj;
        s->edg = g->edg;

        nsplits = s->nsplits;
        
        for (j = 0; j < s->n; j += c->clen[j]+1)            
                add_induce(s, c, j);
        refine(s, c);

        if (s->nsplits > nsplits) {
            /* save the random vector */
            Vec_PtrPush(s->randomVectorArray_sim2, randVec);            
            i = 0; /* reset i */
            /* do more refinement by dependency graph */
            for (j = 0; j < s->n; j += c->clen[j]+1)                
                    add_induce(s, c, j);
            refineByDepGraph(s, c);
        }
        else
            Vec_IntFree(randVec);
        
        ABC_FREE( g->adj );
        ABC_FREE( g->edg );
        ABC_FREE( g );
    }

    s->randomVectorSplit_sim2[s->lev] = Vec_PtrSize(s->randomVectorArray_sim2); 

    return 1;
}

static int
refineBySim2_other(struct saucy *s, struct coloring *c) 
{
    struct saucy_graph *g;
    Vec_Int_t * randVec;
    int i, j;
    int ret, nsplits;

    for (i = s->randomVectorSplit_sim2[s->lev-1]; i < s->randomVectorSplit_sim2[s->lev]; i++) {
        randVec = (Vec_Int_t *)Vec_PtrEntry(s->randomVectorArray_sim2, i);       
        g = buildSim2Graph(s->pNtk, c, randVec, s->iDep, s->oDep, s->topOrder, s->obs,  s->ctrl);

        if (g == NULL) {
            assert(c == &s->right);
            return 0;
        }
        
        s->adj = g->adj;
        s->edg = g->edg;    

        nsplits = s->nsplits;       

        for (j = 0; j < s->n; j += c->clen[j]+1)            
                add_induce(s, c, j);
        ret = refine(s, c);

        if (s->nsplits == nsplits) {
            assert(c == &s->right);
            ret = 0;
        }

        if (ret) {
            /* do more refinement by dependency graph */
            for (j = 0; j < s->n; j += c->clen[j]+1)                
                    add_induce(s, c, j);
            ret = refineByDepGraph(s, c);
        }

        ABC_FREE( g->adj );
        ABC_FREE( g->edg );
        ABC_FREE( g );

        if (!ret) {
            assert(c == &s->right);
            return 0;
        }
    }

    return 1;
}

static int
check_OPP_only_has_swaps(struct saucy *s, struct coloring *c)
{
    int j, cell;
    Vec_Int_t * left_cfront, * right_cfront;

    if (c == &s->left)
        return 1;

    left_cfront = Vec_IntAlloc (1);
    right_cfront = Vec_IntAlloc (1);

    for (cell = 0; cell < s->n; cell += (s->left.clen[cell]+1)) {               
        for (j = cell; j <= (cell+s->left.clen[cell]); j++) {
            Vec_IntPush(left_cfront, s->left.cfront[s->right.lab[j]]);
            Vec_IntPush(right_cfront, s->right.cfront[s->left.lab[j]]);             
        }
        Vec_IntSortUnsigned(left_cfront);
        Vec_IntSortUnsigned(right_cfront);
        for (j = 0; j < Vec_IntSize(left_cfront); j++) {
            if (Vec_IntEntry(left_cfront, j) != Vec_IntEntry(right_cfront, j)) {
                Vec_IntFree(left_cfront);
                Vec_IntFree(right_cfront);
                return 0;
            }
        }
        Vec_IntClear(left_cfront);
        Vec_IntClear(right_cfront);
    }

    Vec_IntFree(left_cfront);
    Vec_IntFree(right_cfront);

    return 1;
}

static int
check_OPP_for_Boolean_matching(struct saucy *s, struct coloring *c)
{
    int j, cell;
    int countN1Left, countN2Left;
    int countN1Right, countN2Right;
    char *name; 

    if (c == &s->left)
        return 1;       

    for (cell = 0; cell < s->n; cell += (s->right.clen[cell]+1)) {  
        countN1Left = countN2Left = countN1Right = countN2Right = 0;

        for (j = cell; j <= (cell+s->right.clen[cell]); j++) {

            name = getVertexName(s->pNtk, s->left.lab[j]);
            assert(name[0] == 'N' && name[2] == ':');
            if (name[1] == '1')
                countN1Left++;
            else {
                assert(name[1] == '2');
                countN2Left++;
            }

            name = getVertexName(s->pNtk, s->right.lab[j]);
            assert(name[0] == 'N' && name[2] == ':');
            if (name[1] == '1') 
                countN1Right++;
            else {
                assert(name[1] == '2');
                countN2Right++;
            }

        }

        if (countN1Left != countN2Right || countN2Left != countN1Right)
            return 0;
    }   
    
    return 1;
}

static int
double_check_OPP_isomorphism(struct saucy *s, struct coloring * c)
{
    /* This is the new enhancement in saucy 3.0 */
    int i, j, v, sum1, sum2, xor1, xor2;

    if (c == &s->left)
        return 1;
    
    for (i = s->nsplits - 1; i > s->splitlev[s->lev-1]; --i) {
        v = c->lab[s->splitwho[i]];
        sum1 = xor1 = 0;
        for (j = s->adj[v]; j < s->adj[v+1]; j++) {
            sum1 += c->cfront[s->edg[j]];
            xor1 ^= c->cfront[s->edg[j]];
        }
        v = s->left.lab[s->splitwho[i]];
        sum2 = xor2 = 0;
        for (j = s->adj[v]; j < s->adj[v+1]; j++) {
            sum2 += s->left.cfront[s->edg[j]];
            xor2 ^= s->left.cfront[s->edg[j]];
        }
        if ((sum1 != sum2) || (xor1 != xor2))
            return 0;
        v = c->lab[s->splitfrom[i]];
        sum1 = xor1 = 0;
        for (j = s->adj[v]; j < s->adj[v+1]; j++) {
            sum1 += c->cfront[s->edg[j]];
            xor1 ^= c->cfront[s->edg[j]];
        }
        v = s->left.lab[s->splitfrom[i]];
        sum2 = xor2 = 0;
        for (j = s->adj[v]; j < s->adj[v+1]; j++) {
            sum2 += s->left.cfront[s->edg[j]];
            xor2 ^= s->left.cfront[s->edg[j]];
        }
        if ((sum1 != sum2) || (xor1 != xor2))
            return 0;
    }   

    return 1;
}

static int
descend(struct saucy *s, struct coloring *c, int target, int min)
{
    int back = target + c->clen[target];

    /* Count this node */
    ++s->stats->nodes;

    /* Move the minimum label to the back */
    swap_labels(c, min, back);

    /* Split the cell */
    s->difflev[s->lev] = s->ndiffs;
    s->undifflev[s->lev] = s->nundiffs;
    ++s->lev;
    s->split(s, c, target, back);   

    /* Now go and do some work */
    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);    
    if (!refineByDepGraph(s, c)) return 0;

    /* if we are looking for a Boolean matching, check the OPP and 
     * backtrack if the OPP maps part of one network to itself */
    if (s->fBooleanMatching && !check_OPP_for_Boolean_matching(s, c)) return 0;

    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);
    if (REFINE_BY_SIM_1 && !s->refineBySim1(s, c)) return 0;

    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);
    if (REFINE_BY_SIM_2 && !s->refineBySim2(s, c)) return 0;

    /* do the check once more, maybe the check fails, now that refinement is complete */
    if (s->fBooleanMatching && !check_OPP_for_Boolean_matching(s, c)) return 0;

    if (s->fLookForSwaps && !check_OPP_only_has_swaps(s, c)) return 0;

    if (!double_check_OPP_isomorphism(s, c)) return 0;
    
    return 1;
}

static int
select_smallest_max_connected_cell(struct saucy *s, int start, int end)
{
    int smallest_cell = -1, cell;
    int smallest_cell_size = s->n;
    int max_connections = -1;
    int * connection_list = zeros(s->n);
    
    cell = start;
    while( !s->left.clen[cell] ) cell++;
    while( cell < end ) {       
        if (s->left.clen[cell] <= smallest_cell_size) {
            int i, connections = 0;;
            for (i = s->depAdj[s->left.lab[cell]]; i < s->depAdj[s->left.lab[cell]+1]; i++) {
                if (!connection_list[s->depEdg[i]]) {
                    connections++;
                    connection_list[s->depEdg[i]] = 1;
                }
            }
            if ((s->left.clen[cell] < smallest_cell_size) || (connections > max_connections)) {
                smallest_cell_size = s->left.clen[cell];
                max_connections = connections;
                smallest_cell = cell;
            }
            for (i = s->depAdj[s->left.lab[cell]]; i < s->depAdj[s->left.lab[cell]+1]; i++)
                connection_list[s->depEdg[i]] = 0;
        }
        cell = s->nextnon[cell];
    }
    
    ABC_FREE( connection_list );
    return smallest_cell;
}

static int
descend_leftmost(struct saucy *s)
{
    int target, min;

    /* Keep going until we're discrete */
    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);
    while (!at_terminal(s)) {
        //target = min = s->nextnon[-1];
        if (s->nextnon[-1] < Abc_NtkPoNum(s->pNtk))
            target = min = select_smallest_max_connected_cell(s, s->nextnon[-1], Abc_NtkPoNum(s->pNtk));            
        else
            target = min = select_smallest_max_connected_cell(s, Abc_NtkPoNum(s->pNtk), s->n);
        if (s->fPrintTree) 
            printf("%s->%s\n", getVertexName(s->pNtk, s->left.lab[min]), getVertexName(s->pNtk, s->left.lab[min]));     
        s->splitvar[s->lev] = s->left.lab[min];
        s->start[s->lev] = target;
        s->splitlev[s->lev] = s->nsplits;
        if (!descend(s, &s->left, target, min)) return 0;       
    }
    s->splitlev[s->lev] = s->n;
    return 1;
}

/*
 * If the remaining nonsingletons in this partition match exactly
 * those nonsingletons from the leftmost branch of the search tree,
 * then there is no point in continuing descent.
 */

static int
zeta_fixed(struct saucy *s)
{
    return s->ndiffs == s->nundiffs;
}

static void
select_dynamically(struct saucy *s, int *target, int *lmin, int *rmin)
{
    /* Both clens are equal; this clarifies the code a bit */
    const int *clen = s->left.clen;
    int i, k;
    //int cf;

    /*
     * If there's a pair, use it.  pairs[0] should always work,
     * but we use a checked loop instead because I'm not 100% sure
     * I'm "unpairing" at every point I should be.
     */
    for (i = 0; i < s->npairs; ++i) {
        k = s->pairs[i];
        *target = s->right.cfront[k];
        *lmin = s->left.unlab[s->right.lab[s->left.unlab[k]]];
        *rmin = s->right.unlab[k];

        if (clen[*target]
                && in_cell_range(&s->left, *lmin, *target)
                && in_cell_range(&s->right, *rmin, *target))
            return;
    }

    /* Diffnons is only consistent when there are no baddies */
    /*if (s->ndiffnons != -1) {
        *target = *lmin = *rmin = s->right.cfront[s->diffnons[0]];
        return;
    }*/

    /* Pick any old target cell and element */
    /*for (i = 0; i < s->ndiffs; ++i) {
        cf = s->right.cfront[s->diffs[i]];
        if (clen[cf]) {
            *lmin = *rmin = *target = cf;
            return;
        }
    }*/

    for (i = 0; i < s->n; i += (clen[i]+1)) {
        if (!clen[i]) continue;
        *rmin = *lmin = *target = i;
        if (s->right.cfront[s->left.lab[*lmin]] == *target)
            *rmin = s->right.unlab[s->left.lab[*lmin]];
        return;
    }   
    
    /* we should never get here */
    abort();
}

static void
select_statically(struct saucy *s, int *target, int *lmin, int *rmin)
{
    int i;

    *target = *rmin = s->left.cfront[s->splitvar[s->lev]];
    *lmin = s->left.unlab[s->splitvar[s->lev]];
    /* try to map identically! */
    for (i = *rmin; i <= (*rmin + s->right.clen[*target]); i++)
        if (s->right.lab[*rmin] == s->left.lab[*lmin]) {
            *rmin = i;
            break;
        }
}

static int
descend_left(struct saucy *s)
{
    int target, lmin, rmin;

    /* Check that we ended at the right spot */
    if (s->nsplits != s->splitlev[s->lev]) return 0;

    /* Keep going until we're discrete */
    while (!at_terminal(s) /*&& !zeta_fixed(s)*/) {

        /* We can pick any old target cell and element */
        s->select_decomposition(s, &target, &lmin, &rmin);

        if (s->fPrintTree) {
            //printf("in level %d: %d->%d\n", s->lev, s->left.lab[lmin], s->right.lab[rmin]);
            printf("in level %d: %s->%s\n", s->lev, getVertexName(s->pNtk, s->left.lab[lmin]), getVertexName(s->pNtk, s->right.lab[rmin]));
        }

        /* Check if we need to refine on the left */
        s->match = 0;
        s->start[s->lev] = target;
        s->split = split_left;
        if (SELECT_DYNAMICALLY) {
            s->refineBySim1 = refineBySim1_left;
            s->refineBySim2 = refineBySim2_left;
        }
        descend(s, &s->left, target, lmin);
        s->splitlev[s->lev] = s->nsplits;
        s->split = split_other;     
        if (SELECT_DYNAMICALLY) {
            s->refineBySim1 = refineBySim1_other;
            s->refineBySim2 = refineBySim2_other;
        }
        --s->lev;
        s->nsplits = s->splitlev[s->lev];

        /* Now refine on the right and ensure matching */
        s->specmin[s->lev] = s->right.lab[rmin];
        if (!descend(s, &s->right, target, rmin)) return 0;
        if (s->nsplits != s->splitlev[s->lev]) return 0;
    }
    return 1;
}

static int
find_representative(int k, int *theta)
{
    int rep, tmp;

    /* Find the minimum cell representative */
    for (rep = k; rep != theta[rep]; rep = theta[rep]);

    /* Update all intermediaries */
    while (theta[k] != rep) {
        tmp = theta[k]; theta[k] = rep; k = tmp;
    }
    return rep;
}

static void
update_theta(struct saucy *s)
{
    int i, k, x, y, tmp;

    for (i = 0; i < s->ndiffs; ++i) {
        k = s->unsupp[i];
        x = find_representative(k, s->theta);
        y = find_representative(s->gamma[k], s->theta);

        if (x != y) {
            if (x > y) {
                tmp = x;
                x = y;
                y = tmp;
            }
            s->theta[y] = x;
            s->thsize[x] += s->thsize[y];

            s->thnext[s->thprev[y]] = s->thnext[y];
            s->thprev[s->thnext[y]] = s->thprev[y];
            s->threp[s->thfront[y]] = s->thnext[y];
        }
    }
}

static int
theta_prune(struct saucy *s)
{
    int start = s->start[s->lev];
    int label, rep, irep;

    irep = find_representative(s->indmin, s->theta);
    while (s->kanctar) {
        label = s->anctar[--s->kanctar];
        rep = find_representative(label, s->theta);
        if (rep == label && rep != irep) {
            return s->right.unlab[label] - start;
        }
    }
    return -1;
}

static int
orbit_prune(struct saucy *s)
{
    int i, label, fixed, min = -1;
    int k = s->start[s->lev];
    int size = s->right.clen[k] + 1;
    int *cell = s->right.lab + k;

    /* The previously fixed value */
    fixed = cell[size-1];

    /* Look for the next minimum cell representative */
    for (i = 0; i < size-1; ++i) {
        label = cell[i];

        /* Skip things we've already considered */
        if (label <= fixed) continue;

        /* Skip things that we'll consider later */
        if (min != -1 && label > cell[min]) continue;

        /* New candidate minimum */
        min = i;
    }

    return min;
}

static void
note_anctar_reps(struct saucy *s)
{
    int i, j, k, m, f, rep, tmp;

    /*
     * Undo the previous level's splits along leftmost so that we
     * join the appropriate lists of theta reps.
     */
    for (i = s->splitlev[s->anc+1]-1; i >= s->splitlev[s->anc]; --i) {
        f = s->splitfrom[i];
        j = s->threp[f];
        k = s->threp[s->splitwho[i]];

        s->thnext[s->thprev[j]] = k;
        s->thnext[s->thprev[k]] = j;

        tmp = s->thprev[j];
        s->thprev[j] = s->thprev[k];
        s->thprev[k] = tmp;

        for (m = k; m != j; m = s->thnext[m]) {
            s->thfront[m] = f;
        }
    }

    /*
     * Just copy over the target's reps and sort by cell size, in
     * the hopes of trimming some otherwise redundant generators.
     */
    s->kanctar = 0;
    s->anctar[s->kanctar++] = rep = s->threp[s->start[s->lev]];
    for (k = s->thnext[rep]; k != rep; k = s->thnext[k]) {
        s->anctar[s->kanctar++] = k;
    }
    array_indirect_sort(s->anctar, s->thsize, s->kanctar);
}

static void
multiply_index(struct saucy *s, int k)
{
    if ((s->stats->grpsize_base *= k) > 1e10) {
        s->stats->grpsize_base /= 1e10;
        s->stats->grpsize_exp += 10;
    }
}

static int
backtrack_leftmost(struct saucy *s)
{
    int rep = find_representative(s->indmin, s->theta);
    int repsize = s->thsize[rep];
    int min = -1;

    pick_all_the_pairs(s);
    clear_undiffnons(s);
    s->ndiffs = s->nundiffs = s->npairs = s->ndiffnons = 0;

    if (repsize != s->right.clen[s->start[s->lev]]+1) {
        min = theta_prune(s);
    }

    if (min == -1) {
        multiply_index(s, repsize);
    }

    return min;
}

static int
backtrack_other(struct saucy *s)
{
    int cf = s->start[s->lev];
    int cb = cf + s->right.clen[cf];
    int spec = s->specmin[s->lev];
    int min;

    /* Avoid using pairs until we get back to leftmost. */
    pick_all_the_pairs(s);

    clear_undiffnons(s);

    s->npairs = s->ndiffnons = -1;

    if (s->right.lab[cb] == spec) {
        min = find_min(s, cf);
        if (min == cb) {
            min = orbit_prune(s);
        }
        else {
            min -= cf;
        }
    }
    else {
        min = orbit_prune(s);
        if (min != -1 && s->right.lab[min + cf] == spec) {
            swap_labels(&s->right, min + cf, cb);
            min = orbit_prune(s);
        }
    }
    return min;
}

static void
rewind_coloring(struct saucy *s, struct coloring *c, int lev)
{
    int i, cf, ff, splits = s->splitlev[lev];
    for (i = s->nsplits - 1; i >= splits; --i) {
        cf = s->splitfrom[i];
        ff = s->splitwho[i];
        c->clen[cf] += c->clen[ff] + 1;
        fix_fronts(c, cf, ff);
    }
}

static void
rewind_simulation_vectors(struct saucy *s, int lev)
{   
    int i;
    for (i = s->randomVectorSplit_sim1[lev]; i < Vec_PtrSize(s->randomVectorArray_sim1); i++)
        Vec_IntFree((Vec_Int_t *)Vec_PtrEntry(s->randomVectorArray_sim1, i));
    Vec_PtrShrink(s->randomVectorArray_sim1, s->randomVectorSplit_sim1[lev]);

    for (i = s->randomVectorSplit_sim2[lev]; i < Vec_PtrSize(s->randomVectorArray_sim2); i++)                      
        Vec_IntFree((Vec_Int_t *)Vec_PtrEntry(s->randomVectorArray_sim2, i));    
    Vec_PtrShrink(s->randomVectorArray_sim2, s->randomVectorSplit_sim2[lev]);
}

static int
do_backtrack(struct saucy *s)
{
    int i, cf, cb;

    /* Undo the splits up to this level */
    rewind_coloring(s, &s->right, s->lev);
    s->nsplits = s->splitlev[s->lev];

    /* Rewind diff information */
    for (i = s->ndiffs - 1; i >= s->difflev[s->lev]; --i) {
        s->diffmark[s->diffs[i]] = 0;
    }
    s->ndiffs = s->difflev[s->lev];
    s->nundiffs = s->undifflev[s->lev];

    /* Point to the target cell */
    cf = s->start[s->lev];
    cb = cf + s->right.clen[cf];

    /* Update ancestor with zeta if we've rewound more */
    if (s->anc > s->lev) {
        s->anc = s->lev;
        s->indmin = s->left.lab[cb];
        s->match = 1;
        note_anctar_reps(s);
    }

    /* Perform backtracking appropriate to our location */
    return s->lev == s->anc
        ? backtrack_leftmost(s)
        : backtrack_other(s);
}

static int
backtrack_loop(struct saucy *s)
{
    int min;

    /* Backtrack as long as we're exhausting target cells */
    for (--s->lev; s->lev; --s->lev) {
        min = do_backtrack(s);
        if (min != -1) return min + s->start[s->lev];
    }
    return -1;
}

static int
backtrack(struct saucy *s)
{
    int min, old, tmp;
    old = s->nsplits;
    min = backtrack_loop(s);
    tmp = s->nsplits;
    s->nsplits = old;
    rewind_coloring(s, &s->left, s->lev+1); 
    s->nsplits = tmp;
    if (SELECT_DYNAMICALLY)
        rewind_simulation_vectors(s, s->lev+1);

    return min;
}

static int
backtrack_bad(struct saucy *s)
{
    int min, old, tmp;
    old = s->lev;
    min = backtrack_loop(s);
    if (BACKTRACK_BY_SAT) {
        int oldLev = s->lev;
        while (!backtrackBysatCounterExamples(s, &s->right)) {                          
            min = backtrack_loop(s);            
            if (!s->lev) {
                if (s->fPrintTree)
                    printf("Backtrack by SAT from level %d to %d\n", oldLev, 0);
                return -1;
            }
        }
        if (s->fPrintTree)          
            if (s->lev < oldLev) 
                printf("Backtrack by SAT from level %d to %d\n", oldLev, s->lev);
    }
    tmp = s->nsplits;
    s->nsplits = s->splitlev[old];
    rewind_coloring(s, &s->left, s->lev+1); 
    s->nsplits = tmp;
    if (SELECT_DYNAMICALLY)
        rewind_simulation_vectors(s, s->lev+1);

    return min;
}

void
prepare_permutation_ntk(struct saucy *s) 
{       
    int i;
    Abc_Obj_t * pObj, * pObjPerm;
    int numouts = Abc_NtkPoNum(s->pNtk);

    Nm_ManFree( s->pNtk_permuted->pManName );
    s->pNtk_permuted->pManName = Nm_ManCreate( Abc_NtkCiNum(s->pNtk) + Abc_NtkCoNum(s->pNtk) + Abc_NtkBoxNum(s->pNtk) );    

    for (i = 0; i < s->n; ++i) {        
        if (i < numouts) {
            pObj     = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk->vPos, i);
            pObjPerm = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk_permuted->vPos, s->gamma[i]);           
        }
        else {          
            pObj     = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk->vPis, i - numouts);
            pObjPerm = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk_permuted->vPis, s->gamma[i] - numouts);
            
        }
        Abc_ObjAssignName( pObjPerm, Abc_ObjName(pObj), NULL );         
    }

    Abc_NtkOrderObjsByName( s->pNtk_permuted, 1 );

    /* print the permutation */
    /*for (i = 0; i < s->ndiffs; ++i)
        printf(" %d->%d", s->unsupp[i], s->diffs[i]);
    printf("\n");
    Abc_NtkForEachCo( s->pNtk, pObj, i )
        printf (" %d", Abc_ObjId(pObj)-1-Abc_NtkPiNum(s->pNtk));
    Abc_NtkForEachCi( s->pNtk, pObj, i )
        printf (" %d", Abc_ObjId(pObj)-1+Abc_NtkPoNum(s->pNtk));
    printf("\n");
    Abc_NtkForEachCo( s->pNtk_permuted, pObj, i )
        printf (" %d", Abc_ObjId(pObj)-1-Abc_NtkPiNum(s->pNtk_permuted));
    Abc_NtkForEachCi( s->pNtk_permuted, pObj, i )
        printf (" %d", Abc_ObjId(pObj)-1+Abc_NtkPoNum(s->pNtk_permuted));   
    printf("\n");*/
}


static void
prepare_permutation(struct saucy *s)
{
    int i, k;
    for (i = 0; i < s->ndiffs; ++i) {
        k = s->right.unlab[s->diffs[i]];
        s->unsupp[i] = s->left.lab[k];
        s->gamma[s->left.lab[k]] = s->right.lab[k];
    }
    prepare_permutation_ntk(s);
}

void
unprepare_permutation_ntk(struct saucy *s) 
{       
    int i;
    Abc_Obj_t * pObj, * pObjPerm;
    int numouts = Abc_NtkPoNum(s->pNtk);

    Nm_ManFree( s->pNtk_permuted->pManName );
    s->pNtk_permuted->pManName = Nm_ManCreate( Abc_NtkCiNum(s->pNtk) + Abc_NtkCoNum(s->pNtk) + Abc_NtkBoxNum(s->pNtk) );    

    for (i = 0; i < s->n; ++i) {        
        if (i < numouts) {
            pObj     = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk->vPos, s->gamma[i]);
            pObjPerm = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk_permuted->vPos, i);         
        }
        else {          
            pObj     = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk->vPis, s->gamma[i] - numouts);
            pObjPerm = (Abc_Obj_t *)Vec_PtrEntry(s->pNtk_permuted->vPis, i - numouts);
            
        }
        Abc_ObjAssignName( pObjPerm, Abc_ObjName(pObj), NULL );         
    }

    Abc_NtkOrderObjsByName( s->pNtk_permuted, 1 );
}


static void
unprepare_permutation(struct saucy *s)  
{
    int i;
    unprepare_permutation_ntk(s);
    for (i = 0; i < s->ndiffs; ++i) {
        s->gamma[s->unsupp[i]] = s->unsupp[i];
    }   
}

static int
do_search(struct saucy *s)
{
    int min;

    unprepare_permutation(s);

    /* Backtrack to the ancestor with zeta */
    if (s->lev > s->anc) s->lev = s->anc + 1;

    /* Perform additional backtracking */
    min = backtrack(s);

    if (s->fBooleanMatching && (s->stats->grpsize_base > 1 || s->stats->grpsize_exp > 0))
        return 0;

    if (s->fPrintTree && s->lev > 0) {
        //printf("in level %d: %d->%d\n", s->lev, s->left.lab[s->splitwho[s->nsplits]], s->right.lab[min]);
        printf("in level %d: %s->%s\n", s->lev, getVertexName(s->pNtk, s->left.lab[s->splitwho[s->nsplits]]), getVertexName(s->pNtk, s->right.lab[min]));
    }   

    /* Keep going while there are tree nodes to expand */
    while (s->lev) {

        /* Descend to a new leaf node */    
        if (descend(s, &s->right, s->start[s->lev], min)
                && descend_left(s)) {

            /* Prepare permutation */
            prepare_permutation(s);

            /* If we found an automorphism, return it */
            if (s->is_automorphism(s)) {
                ++s->stats->gens;
                s->stats->support += s->ndiffs;
                update_theta(s);                
                s->print_automorphism(s->gFile, s->n, s->gamma, s->ndiffs, s->unsupp, s->marks, s->pNtk);
                unprepare_permutation(s);               
                return 1;
            }
            else {
                unprepare_permutation(s);
            }
        }

        /* If we get here, something went wrong; backtrack */
        ++s->stats->bads;
        min = backtrack_bad(s);
        if (s->fPrintTree) {
            printf("BAD NODE\n");
            if (s->lev > 0) {
                //printf("in level %d: %d->%d\n", s->lev, s->left.lab[s->splitwho[s->nsplits]], s->right.lab[min]);     
                printf("in level %d: %s->%s\n", s->lev, getVertexName(s->pNtk, s->left.lab[s->splitwho[s->nsplits]]), getVertexName(s->pNtk, s->right.lab[min]));                               
            }
        }
    }

    /* Normalize group size */
    while (s->stats->grpsize_base >= 10.0) {
        s->stats->grpsize_base /= 10;
        ++s->stats->grpsize_exp;
    }
    return 0;
}

void
saucy_search(
    Abc_Ntk_t * pNtk,
    struct saucy *s,
    int directed,
    const int *colors,
    struct saucy_stats *stats)
{
    int i, j, max = 0;  
    struct saucy_graph *g;

    extern Abc_Ntk_t * Abc_NtkDup( Abc_Ntk_t * pNtk );

    /* Save network information */
    s->pNtk = pNtk;
    s->pNtk_permuted = Abc_NtkDup( pNtk );  

    /* Builde dependency graph */
    g = buildDepGraph(pNtk, s->iDep, s->oDep);  

    /* Save graph information */
    s->n = g->n;
    s->depAdj = g->adj;
    s->depEdg = g->edg;
    /*s->dadj = g->adj + g->n + 1;
    s->dedg = g->edg + g->e;*/

    /* Save client information */
    s->stats = stats;       

    /* Polymorphism */
    if (directed) {
        s->is_automorphism = is_directed_automorphism;
        s->ref_singleton = ref_singleton_directed;
        s->ref_nonsingle = ref_nonsingle_directed;
    }
    else {
        s->is_automorphism = is_undirected_automorphism;
        s->ref_singleton = ref_singleton_undirected;
        s->ref_nonsingle = ref_nonsingle_undirected;
    }

    /* Initialize scalars */
    s->indmin = 0;  
    s->lev = s->anc = 1;
    s->ndiffs = s->nundiffs = s->ndiffnons = 0;
    s->activityInc = 1;

    /* The initial orbit partition is discrete */
    for (i = 0; i < s->n; ++i) {
        s->theta[i] = i;
    }

    /* The initial permutation is the identity */
    for (i = 0; i < s->n; ++i) {
        s->gamma[i] = i;
    }

    /* Initially every cell of theta has one element */
    for (i = 0; i < s->n; ++i) {
        s->thsize[i] = 1;
    }

    /* Every theta rep list is singleton */
    for (i = 0; i < s->n; ++i) {
        s->thprev[i] = s->thnext[i] = i;
    }

    /* We have no pairs yet */
    s->npairs = 0;
    for (i = 0; i < s->n; ++i) {
        s->unpairs[i] = -1;
    }

    /* Ensure no stray pointers in undiffnons, which is checked by removed_diffnon() */
    for (i = 0; i < s->n; ++i) {
        s->undiffnons[i] = -1;
    }

    /* Initialize stats */
    s->stats->grpsize_base = 1.0;
    s->stats->grpsize_exp = 0;
    s->stats->nodes = 1;
    s->stats->bads = s->stats->gens = s->stats->support = 0;

    /* Prepare for refinement */
    s->nninduce = s->nsinduce = 0;
    s->csize = 0;

    /* Count cell sizes */
    for (i = 0; i < s->n; ++i) {
        s->ccount[colors[i]]++;
        if (max < colors[i]) max = colors[i];
    }
    s->nsplits = max + 1;

    /* Build cell lengths */
    s->left.clen[0] = s->ccount[0] - 1;
    for (i = 0; i < max; ++i) {
        s->left.clen[s->ccount[i]] = s->ccount[i+1] - 1;
        s->ccount[i+1] += s->ccount[i];
    }

    /* Build the label array */
    for (i = 0; i < s->n; ++i) {
        set_label(&s->left, --s->ccount[colors[i]], i);
    }

    /* Clear out ccount */
    for (i = 0; i <= max; ++i) {
        s->ccount[i] = 0;
    }

    /* Update refinement stuff based on initial partition */
    for (i = 0; i < s->n; i += s->left.clen[i]+1) {
        add_induce(s, &s->left, i);
        fix_fronts(&s->left, i, i);
    }

    /* Prepare lists based on cell lengths */
    for (i = 0, j = -1; i < s->n; i += s->left.clen[i] + 1) {
        if (!s->left.clen[i]) continue;
        s->prevnon[i] = j;
        s->nextnon[j] = i;
        j = i;
    }

    /* Fix the end */
    s->prevnon[s->n] = j;
    s->nextnon[j] = s->n;

    /* Preprocessing after initial coloring */
    s->split = split_init;  
    s->refineBySim1 = refineBySim1_init;
    s->refineBySim2 = refineBySim2_init;    

    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);
    printf("Initial Refine by Dependency graph ... ");
    refineByDepGraph(s, &s->left);
    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);
    printf("done!\n");
    
    printf("Initial Refine by Simulation ... ");
    if (REFINE_BY_SIM_1) s->refineBySim1(s, &s->left);
    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);
    if (REFINE_BY_SIM_2) s->refineBySim2(s, &s->left);
    //print_partition(&s->left, NULL, s->n, s->pNtk, 1);
    printf("done!\n\t--------------------\n");

    /* Descend along the leftmost branch and compute zeta */
    s->refineBySim1 = refineBySim1_left;
    s->refineBySim2 = refineBySim2_left;
    descend_leftmost(s);    
    s->split = split_other; 
    s->refineBySim1 = refineBySim1_other;
    s->refineBySim2 = refineBySim2_other;   

    /* Our common ancestor with zeta is the current level */
    s->stats->levels = s->anc = s->lev;

    /* Copy over this data to our non-leftmost coloring */
    memcpy(s->right.lab, s->left.lab, s->n * sizeof(int));
    memcpy(s->right.unlab, s->left.unlab, s->n * sizeof(int));
    memcpy(s->right.clen, s->left.clen, s->n * sizeof(int));
    memcpy(s->right.cfront, s->left.cfront, s->n * sizeof(int));

    /* The reps are just the labels at this point */
    memcpy(s->threp, s->left.lab, s->n * sizeof(int));
    memcpy(s->thfront, s->left.unlab, s->n * sizeof(int));

    /* choose cell selection method */
    if (SELECT_DYNAMICALLY) s->select_decomposition = select_dynamically;
    else                    s->select_decomposition = select_statically;

    /* Keep running till we're out of automorphisms */
    while (do_search(s));
}

void
saucy_free(struct saucy *s)
{
    int i;

    ABC_FREE(s->undiffnons);
    ABC_FREE(s->diffnons);
    ABC_FREE(s->unpairs);
    ABC_FREE(s->pairs);
    ABC_FREE(s->thfront);
    ABC_FREE(s->threp);
    ABC_FREE(s->thnext);
    ABC_FREE(s->thprev);
    ABC_FREE(s->specmin);
    ABC_FREE(s->anctar);
    ABC_FREE(s->thsize);
    ABC_FREE(s->undifflev);
    ABC_FREE(s->difflev);
    ABC_FREE(s->diffs);
    ABC_FREE(s->diffmark);
    ABC_FREE(s->conncnts);
    ABC_FREE(s->unsupp);
    ABC_FREE(s->splitlev);
    ABC_FREE(s->splitfrom);
    ABC_FREE(s->splitwho);
    ABC_FREE(s->splitvar);
    ABC_FREE(s->right.unlab);
    ABC_FREE(s->right.lab);
    ABC_FREE(s->left.unlab);
    ABC_FREE(s->left.lab);
    ABC_FREE(s->theta);
    ABC_FREE(s->junk);
    ABC_FREE(s->gamma);
    ABC_FREE(s->start);
    ABC_FREE(s->prevnon);
    free(s->nextnon-1);
    ABC_FREE(s->clist);
    ABC_FREE(s->ccount);
    ABC_FREE(s->count);
    ABC_FREE(s->bucket);
    ABC_FREE(s->stuff);
    ABC_FREE(s->right.clen);
    ABC_FREE(s->right.cfront);
    ABC_FREE(s->left.clen);
    ABC_FREE(s->left.cfront);
    ABC_FREE(s->indmark);
    ABC_FREE(s->sinduce);
    ABC_FREE(s->ninduce);
    ABC_FREE(s->depAdj);
    ABC_FREE(s->depEdg);
    ABC_FREE(s->marks);
    for (i = 0; i < Abc_NtkPiNum(s->pNtk); i++) {
        Vec_IntFree( s->iDep[i] );
        Vec_IntFree( s->obs[i] );
        Vec_PtrFree( s->topOrder[i] );
    }
    for (i = 0; i < Abc_NtkPoNum(s->pNtk); i++) {
        Vec_IntFree( s->oDep[i] );
        Vec_IntFree( s->ctrl[i] );
    }
    for (i = 0; i < Vec_PtrSize(s->randomVectorArray_sim1); i++)
        Vec_IntFree((Vec_Int_t *)Vec_PtrEntry(s->randomVectorArray_sim1, i));
    for (i = 0; i < Vec_PtrSize(s->randomVectorArray_sim2); i++)
        Vec_IntFree((Vec_Int_t *)Vec_PtrEntry(s->randomVectorArray_sim2, i));
    Vec_PtrFree( s->randomVectorArray_sim1 );
    Vec_PtrFree( s->randomVectorArray_sim2 );
    ABC_FREE(s->randomVectorSplit_sim1);
    ABC_FREE(s->randomVectorSplit_sim2);
    Abc_NtkDelete( s->pNtk_permuted );
    for (i = 0; i < Vec_PtrSize(s->satCounterExamples); i++) {
        struct sim_result * cex = (struct sim_result *)Vec_PtrEntry(s->satCounterExamples, i);
        ABC_FREE( cex->inVec );
        ABC_FREE( cex->outVec );
        ABC_FREE( cex );
    }
    Vec_PtrFree(s->satCounterExamples);
    ABC_FREE( s->pModel );
    ABC_FREE( s->iDep );
    ABC_FREE( s->oDep );
    ABC_FREE( s->obs );
    ABC_FREE( s->ctrl );
    ABC_FREE( s->topOrder );
    ABC_FREE(s);
}

struct saucy *
saucy_alloc(Abc_Ntk_t * pNtk)
{
    int i;
    int numouts = Abc_NtkPoNum(pNtk);
    int numins =  Abc_NtkPiNum(pNtk);
    int n = numins + numouts;
    struct saucy *s = ABC_ALLOC(struct saucy, 1);
    if (s == NULL) return NULL;

    s->ninduce = ints(n);
    s->sinduce = ints(n);
    s->indmark = bits(n);
    s->left.cfront = zeros(n);
    s->left.clen = ints(n);
    s->right.cfront = zeros(n);
    s->right.clen = ints(n);
    s->stuff = bits(n+1);
    s->bucket = ints(n+2);
    s->count = ints(n+1);
    s->ccount = zeros(n);
    s->clist = ints(n);
    s->nextnon = ints(n+1) + 1;
    s->prevnon = ints(n+1);
    s->anctar = ints(n);
    s->start = ints(n);
    s->gamma = ints(n);
    s->junk = ints(n);
    s->theta = ints(n);
    s->thsize = ints(n);
    s->left.lab = ints(n);
    s->left.unlab = ints(n);
    s->right.lab = ints(n);
    s->right.unlab = ints(n);
    s->splitvar = ints(n);
    s->splitwho = ints(n);
    s->splitfrom = ints(n);
    s->splitlev = ints(n+1);
    s->unsupp = ints(n);
    s->conncnts = zeros(n);
    s->diffmark = bits(n);
    s->diffs = ints(n);
    s->difflev = ints(n);
    s->undifflev = ints(n);
    s->specmin = ints(n);
    s->thnext = ints(n);
    s->thprev = ints(n);
    s->threp = ints(n);
    s->thfront = ints(n);
    s->pairs = ints(n);
    s->unpairs = ints(n);
    s->diffnons = ints(n);
    s->undiffnons = ints(n);
    s->marks = bits(n);

    s->iDep = ABC_ALLOC( Vec_Int_t*,  numins );
    s->oDep = ABC_ALLOC( Vec_Int_t*,  numouts );
    s->obs  = ABC_ALLOC( Vec_Int_t*,  numins );
    s->ctrl = ABC_ALLOC( Vec_Int_t*,  numouts );

    for(i = 0; i < numins; i++) {       
        s->iDep[i] = Vec_IntAlloc( 1 );
        s->obs[i] = Vec_IntAlloc( 1 );
    }
    for(i = 0; i < numouts; i++) {      
        s->oDep[i] = Vec_IntAlloc( 1 );
        s->ctrl[i] = Vec_IntAlloc( 1 );
    }   

    s->randomVectorArray_sim1 = Vec_PtrAlloc( n );  
    s->randomVectorSplit_sim1 = zeros( n );
    s->randomVectorArray_sim2 = Vec_PtrAlloc( n );  
    s->randomVectorSplit_sim2= zeros( n );

    s->satCounterExamples = Vec_PtrAlloc( 1 );
    s->pModel = ints( numins );

    if (s->ninduce && s->sinduce && s->left.cfront && s->left.clen
        && s->right.cfront && s->right.clen
        && s->stuff && s->bucket && s->count && s->ccount
        && s->clist && s->nextnon-1 && s->prevnon
        && s->start && s->gamma && s->theta && s->left.unlab
        && s->right.lab && s->right.unlab
        && s->left.lab &&  s->splitvar && s->splitwho && s->junk
        && s->splitfrom && s->splitlev && s->thsize
        && s->unsupp && s->conncnts && s->anctar
        && s->diffmark && s->diffs && s->indmark
        && s->thnext && s->thprev && s->threp && s->thfront
        && s->pairs && s->unpairs && s->diffnons && s->undiffnons
        && s->difflev && s->undifflev && s->specmin)
    {
        return s;
    }
    else {
        saucy_free(s);
        return NULL;
    }
}

static void
print_stats(FILE *f, struct saucy_stats stats )
{
    fprintf(f, "group size = %fe%d\n",
        stats.grpsize_base, stats.grpsize_exp);
    fprintf(f, "levels = %d\n", stats.levels);
    fprintf(f, "nodes = %d\n", stats.nodes);
    fprintf(f, "generators = %d\n", stats.gens);
    fprintf(f, "total support = %d\n", stats.support);
    fprintf(f, "average support = %.2f\n",(double)(stats.support)/(double)(stats.gens));
    fprintf(f, "nodes per generator = %.2f\n",(double)(stats.nodes)/(double)(stats.gens));
    fprintf(f, "bad nodes = %d\n", stats.bads);
}


/* From this point up are SAUCY functions*/
/////////////////////////////////////////////////////////////////////////////////////////////////////////
/* From this point down are new functions */

static char * 
getVertexName(Abc_Ntk_t *pNtk, int v)
{   
    Abc_Obj_t * pObj;
    int numouts =  Abc_NtkPoNum(pNtk);

    if (v < numouts)    
        pObj = (Abc_Obj_t *)Vec_PtrEntry(pNtk->vPos, v);
    else
        pObj = (Abc_Obj_t *)Vec_PtrEntry(pNtk->vPis, v - numouts);       
    
    return Abc_ObjName(pObj);
}

static Vec_Ptr_t ** 
findTopologicalOrder( Abc_Ntk_t * pNtk )
{
    Vec_Ptr_t ** vNodes;
    Abc_Obj_t * pObj, * pFanout;
    int i, k;    
    
    extern void Abc_NtkDfsReverse_rec( Abc_Obj_t * pNode, Vec_Ptr_t * vNodes );
    
    /* start the array of nodes */
    vNodes = ABC_ALLOC(Vec_Ptr_t *, Abc_NtkPiNum(pNtk));
    for(i = 0; i < Abc_NtkPiNum(pNtk); i++)
        vNodes[i] = Vec_PtrAlloc(50);   
    
    Abc_NtkForEachCi( pNtk, pObj, i )
    {
        /* set the traversal ID */
        Abc_NtkIncrementTravId( pNtk );
        Abc_NodeSetTravIdCurrent( pObj );
        pObj = Abc_ObjFanout0Ntk(pObj);
        Abc_ObjForEachFanout( pObj, pFanout, k )
            Abc_NtkDfsReverse_rec( pFanout, vNodes[i] );
    }
   
    return vNodes;
}

static void 
getDependencies(Abc_Ntk_t *pNtk, Vec_Int_t** iDep, Vec_Int_t** oDep)
{   
    Vec_Ptr_t * vSuppFun;
    int i, j;   
    
    vSuppFun = Sim_ComputeFunSupp(pNtk, 0);
    for(i = 0; i < Abc_NtkPoNum(pNtk); i++) {
        char * seg = (char *)vSuppFun->pArray[i];
        
        for(j = 0; j < Abc_NtkPiNum(pNtk); j+=8) {
            if(((*seg) & 0x01) == 0x01)
                Vec_IntPushOrder(oDep[i], j);
            if(((*seg) & 0x02) == 0x02)
                Vec_IntPushOrder(oDep[i], j+1);
            if(((*seg) & 0x04) == 0x04)
                Vec_IntPushOrder(oDep[i], j+2);
            if(((*seg) & 0x08) == 0x08)
                Vec_IntPushOrder(oDep[i], j+3);
            if(((*seg) & 0x10) == 0x10)
                Vec_IntPushOrder(oDep[i], j+4);
            if(((*seg) & 0x20) == 0x20)
                Vec_IntPushOrder(oDep[i], j+5);
            if(((*seg) & 0x40) == 0x40)
                Vec_IntPushOrder(oDep[i], j+6);
            if(((*seg) & 0x80) == 0x80)
                Vec_IntPushOrder(oDep[i], j+7);

            seg++;
        }
    }

    for(i = 0; i < Abc_NtkPoNum(pNtk); i++)
        for(j = 0; j < Vec_IntSize(oDep[i]); j++)
            Vec_IntPush(iDep[Vec_IntEntry(oDep[i], j)], i); 
    

    /*for(i = 0; i < Abc_NtkPoNum(pNtk); i++)
    {
        printf("Output %d: ", i);
        for(j = 0; j < Vec_IntSize(oDep[i]); j++)
            printf("%d ", Vec_IntEntry(oDep[i], j));
        printf("\n");
    }

    printf("\n");

    for(i = 0; i < Abc_NtkPiNum(pNtk); i++)
    {
        printf("Input %d: ", i);
        for(j = 0; j < Vec_IntSize(iDep[i]); j++)
            printf("%d ", Vec_IntEntry(iDep[i], j));
        printf("\n");
    }

    printf("\n");   */  
}

static void 
getDependenciesDummy(Abc_Ntk_t *pNtk, Vec_Int_t** iDep, Vec_Int_t** oDep)
{       
    int i, j;   
    
    /* let's assume that every output is dependent on every input */
    for(i = 0; i < Abc_NtkPoNum(pNtk); i++)
        for(j = 0; j < Abc_NtkPiNum(pNtk); j++)
            Vec_IntPush(oDep[i], j);

    for(i = 0; i < Abc_NtkPiNum(pNtk); i++)
        for(j = 0; j < Abc_NtkPoNum(pNtk); j++)
            Vec_IntPush(iDep[i], j);
}

static struct saucy_graph *
buildDepGraph(Abc_Ntk_t *pNtk, Vec_Int_t ** iDep, Vec_Int_t ** oDep)
{       
    int i, j, k;    
    struct saucy_graph *g = NULL;
    int n, e, *adj, *edg;   

    n = Abc_NtkPoNum(pNtk) + Abc_NtkPiNum(pNtk);
    for (e = 0, i = 0; i < Abc_NtkPoNum(pNtk); i++)
        e += Vec_IntSize(oDep[i]);  

    g = ABC_ALLOC(struct saucy_graph, 1);
    adj = zeros(n+1);
    edg = ints(2*e);    

    g->n = n;
    g->e = e;
    g->adj = adj;
    g->edg = edg;   

    adj[0] = 0;
    for (i = 0; i < n; i++) {
        /* first add outputs and then inputs */
        if ( i < Abc_NtkPoNum(pNtk)) {          
            adj[i+1] = adj[i] + Vec_IntSize(oDep[i]);
            for (k = 0, j = adj[i]; j < adj[i+1]; j++, k++)
                edg[j] = Vec_IntEntry(oDep[i], k) + Abc_NtkPoNum(pNtk);
        }
        else {          
            adj[i+1] = adj[i] + Vec_IntSize(iDep[i-Abc_NtkPoNum(pNtk)]);
            for (k = 0, j = adj[i]; j < adj[i+1]; j++, k++)
                edg[j] = Vec_IntEntry(iDep[i-Abc_NtkPoNum(pNtk)], k);
        }
    }

    /* print graph for testing */
    /*for (i = 0; i < n; i++) {
        printf("%d: ", i);
        for (j = adj[i]; j < adj[i+1]; j++)
            printf("%d ", edg[j]);
        printf("\n");
    }*/

    return g;
}

static Vec_Int_t * 
assignRandomBitsToCells(Abc_Ntk_t * pNtk, struct coloring *c)
{
    Vec_Int_t * randVec = Vec_IntAlloc( 1 );
    int i, bit;

    for (i = 0; i < Abc_NtkPiNum(pNtk); i += (c->clen[i+Abc_NtkPoNum(pNtk)]+1)) {
        bit = (int)(SIM_RANDOM_UNSIGNED % 2);
        Vec_IntPush(randVec, bit);
    }

    return randVec;
}

static int * 
generateProperInputVector( Abc_Ntk_t * pNtk, struct coloring *c, Vec_Int_t * randomVector )
{
    int * vPiValues;    
    int i, j, k, bit, input;
    int numouts =  Abc_NtkPoNum(pNtk);
    int numins =  Abc_NtkPiNum(pNtk);
    int n = numouts + numins;

    vPiValues = ABC_ALLOC( int,  numins);   

    for (i = numouts, k = 0; i < n; i += (c->clen[i]+1), k++) {
        if (k == Vec_IntSize(randomVector)) break;

        bit = Vec_IntEntry(randomVector, k);
        for (j = i; j <= (i + c->clen[i]); j++) {
            input = c->lab[j] - numouts;
            vPiValues[input] = bit;
        }
    }

    //if (k != Vec_IntSize(randomVector)) {
    if (i < n) {
        ABC_FREE( vPiValues );
        return NULL;
    }

    return vPiValues;
}

static int
ifInputVectorsAreConsistent( struct saucy * s, int * leftVec, int * rightVec )
{
    /* This function assumes that left and right partitions are isomorphic */
    int i, j;
    int lab;
    int left_bit, right_bit;
    int numouts =  Abc_NtkPoNum(s->pNtk);
    int n = numouts + Abc_NtkPiNum(s->pNtk);

    for (i = numouts; i < n; i += (s->right.clen[i]+1)) {       
        lab = s->left.lab[i] - numouts;
        left_bit = leftVec[lab];
        for (j = i+1; j <= (i + s->right.clen[i]); j++) {
            lab = s->left.lab[j] - numouts;         
            if (left_bit != leftVec[lab]) return -1;
        }       
        
        lab = s->right.lab[i] - numouts;
        right_bit = rightVec[lab];
        for (j = i+1; j <= (i + s->right.clen[i]); j++) {
            lab = s->right.lab[j] - numouts;            
            if (right_bit != rightVec[lab]) return 0;           
        }

        if (left_bit != right_bit) 
             return 0;
    }

    return 1;
}

static int
ifOutputVectorsAreConsistent( struct saucy * s, int * leftVec, int * rightVec )
{
    /* This function assumes that left and right partitions are isomorphic */
    int i, j;
    int count1, count2;

    for (i = 0; i < Abc_NtkPoNum(s->pNtk); i += (s->right.clen[i]+1)) {     
        count1 = count2 = 0;
        for (j = i; j <= (i + s->right.clen[i]); j++) {         
            if (leftVec[s->left.lab[j]]) count1++;
            if (rightVec[s->right.lab[j]]) count2++;
        }

        if (count1 != count2) return 0;
    }

    return 1;
}

static struct saucy_graph *
buildSim1Graph( Abc_Ntk_t * pNtk, struct coloring *c, Vec_Int_t * randVec, Vec_Int_t ** iDep, Vec_Int_t ** oDep )
{
    int i, j, k;
    struct saucy_graph *g;
    int n, e, *adj, *edg;
    int * vPiValues, * output;
    int numOneOutputs = 0;
    int numouts =  Abc_NtkPoNum(pNtk);
    int numins = Abc_NtkPiNum(pNtk);

    vPiValues = generateProperInputVector(pNtk, c, randVec);
    if (vPiValues == NULL) 
        return NULL;

    output = Abc_NtkVerifySimulatePattern(pNtk, vPiValues);

    for (i = 0; i < numouts; i++) {
        if (output[i])
            numOneOutputs++;
    }

    g = ABC_ALLOC(struct saucy_graph, 1);
    n = numouts + numins;
    e = numins * numOneOutputs;
    adj = ints(n+1);
    edg = ints(2*e);        
    g->n = n;
    g->e = e;
    g->adj = adj;
    g->edg = edg;   

    adj[0] = 0;
    for (i = 0; i < numouts; i++) {
        if (output[i]) {
            adj[i+1] = adj[i] + Vec_IntSize(oDep[i]);
            for (j = adj[i], k = 0; j < adj[i+1]; j++, k++)
                edg[j] = Vec_IntEntry(oDep[i], k) + numouts;
        } else {
            adj[i+1] = adj[i];
        }
    }

    for (i = 0; i < numins; i++) {
        adj[i+numouts+1] = adj[i+numouts];
        for (k = 0, j = adj[i+numouts]; k < Vec_IntSize(iDep[i]); k++) {
            if (output[Vec_IntEntry(iDep[i], k)]) {
                edg[j++] = Vec_IntEntry(iDep[i], k);
                adj[i+numouts+1]++;
            }
        }
    }

    /* print graph */
    /*for (i = 0; i < n; i++) {
        printf("%d: ", i);
        for (j = adj[i]; j < adj[i+1]; j++)
            printf("%d ", edg[j]);
        printf("\n");
    }*/

    ABC_FREE( vPiValues );  
    ABC_FREE( output );
    
    return g;   
}

static struct saucy_graph *
buildSim2Graph( Abc_Ntk_t * pNtk, struct coloring *c, Vec_Int_t * randVec, Vec_Int_t ** iDep, Vec_Int_t ** oDep, Vec_Ptr_t ** topOrder, Vec_Int_t ** obs,  Vec_Int_t ** ctrl )
{
    int i, j, k;
    struct saucy_graph *g = NULL;
    int n, e = 0, *adj, *edg;
    int * vPiValues;
    int * output, * output2;
    int numouts =  Abc_NtkPoNum(pNtk);
    int numins =  Abc_NtkPiNum(pNtk);

    extern int * Abc_NtkSimulateOneNode( Abc_Ntk_t * , int * , int , Vec_Ptr_t ** );    
    
    vPiValues = generateProperInputVector(pNtk, c, randVec);
    if (vPiValues == NULL) 
        return NULL;

    output = Abc_NtkVerifySimulatePattern( pNtk, vPiValues );   
    
    for (i = 0; i < numins; i++) {
        if (!c->clen[c->cfront[i+numouts]]) continue;
        if (vPiValues[i] == 0)  vPiValues[i] = 1;
        else                    vPiValues[i] = 0;

        output2 = Abc_NtkSimulateOneNode( pNtk, vPiValues, i, topOrder );

        for (j = 0; j < Vec_IntSize(iDep[i]); j++) {
            if (output[Vec_IntEntry(iDep[i], j)] != output2[Vec_IntEntry(iDep[i], j)]) {
                Vec_IntPush(obs[i], Vec_IntEntry(iDep[i], j));
                Vec_IntPush(ctrl[Vec_IntEntry(iDep[i], j)], i);
                e++;
            }
        }

        if (vPiValues[i] == 0)  vPiValues[i] = 1;
        else                    vPiValues[i] = 0;

        ABC_FREE( output2 );
    }       

    /* build the graph */
    g = ABC_ALLOC(struct saucy_graph, 1);
    n = numouts + numins;
    adj = ints(n+1);
    edg = ints(2*e);        
    g->n = n;
    g->e = e;
    g->adj = adj;
    g->edg = edg;       

    adj[0] = 0;
    for (i = 0; i < numouts; i++) {
        adj[i+1] = adj[i] + Vec_IntSize(ctrl[i]);
        for (k = 0, j = adj[i]; j < adj[i+1]; j++, k++)
            edg[j] = Vec_IntEntry(ctrl[i], k) + numouts;
    }
    for (i = 0; i < numins; i++) {
        adj[i+numouts+1] = adj[i+numouts] + Vec_IntSize(obs[i]);
        for (k = 0, j = adj[i+numouts]; j < adj[i+numouts+1]; j++, k++)
            edg[j] = Vec_IntEntry(obs[i], k);
    }

    /* print graph */
    /*for (i = 0; i < n; i++) {
        printf("%d: ", i);
        for (j = adj[i]; j < adj[i+1]; j++)
            printf("%d ", edg[j]);
        printf("\n");
    }*/

    ABC_FREE( output );
    ABC_FREE( vPiValues );  
    for (j = 0; j < numins; j++)
        Vec_IntClear(obs[j]);
    for (j = 0; j < numouts; j++)
        Vec_IntClear(ctrl[j]);

    return g;
}

static void 
bumpActivity( struct saucy * s, struct sim_result * cex )
{
    int i;
    struct sim_result * cex2;

    if ( (cex->activity += s->activityInc) > 1e20 ) {
        /* Rescale: */
        for (i = 0; i < Vec_PtrSize(s->satCounterExamples); i++) {
            cex2 = (struct sim_result *)Vec_PtrEntry(s->satCounterExamples, i);
            cex2->activity *= 1e-20;
        }
        s->activityInc *= 1e-20; 
    } 
}

static void
reduceDB( struct saucy * s )
{   
    int i, j;
    double extra_lim = s->activityInc / Vec_PtrSize(s->satCounterExamples);    /* Remove any clause below this activity */
    struct sim_result * cex;

    while (Vec_PtrSize(s->satCounterExamples) > (0.7 * MAX_LEARNTS)) {
        for (i = j = 0; i < Vec_PtrSize(s->satCounterExamples); i++) {
            cex = (struct sim_result *)Vec_PtrEntry(s->satCounterExamples, i);
            if (cex->activity < extra_lim) {
                ABC_FREE(cex->inVec);
                ABC_FREE(cex->outVec);
                ABC_FREE(cex);                      
            }
            else if (j < i) {
                Vec_PtrWriteEntry(s->satCounterExamples, j, cex);
                j++;
            }
        }
        //printf("Database size reduced from %d to %d\n", Vec_PtrSize(s->satCounterExamples), j);
        Vec_PtrShrink(s->satCounterExamples, j);        
        extra_lim *= 2;
    }
    
    assert(Vec_PtrSize(s->satCounterExamples) <= (0.7 * MAX_LEARNTS));
}

static struct sim_result *
analyzeConflict( Abc_Ntk_t * pNtk, int * pModel, int fVerbose )
{   
    Abc_Obj_t * pNode;
    int i, count = 0;
    int * pValues;
    struct sim_result * cex;
    int numouts = Abc_NtkPoNum(pNtk);
    int numins = Abc_NtkPiNum(pNtk);
    
    cex = ABC_ALLOC(struct sim_result, 1);  
    cex->inVec = ints( numins );
    cex->outVec =  ints( numouts ); 

    /* get the CO values under this model */
    pValues = Abc_NtkVerifySimulatePattern( pNtk, pModel );    

    Abc_NtkForEachCi( pNtk, pNode, i ) 
        cex->inVec[Abc_ObjId(pNode)-1] = pModel[i];
    Abc_NtkForEachCo( pNtk, pNode, i ) {
        cex->outVec[Abc_ObjId(pNode)-numins-1] = pValues[i];
        if (pValues[i]) count++;
    }   
    
    cex->outVecOnes = count;
    cex->activity = 0;  

    if (fVerbose) {
        Abc_NtkForEachCi( pNtk, pNode, i )
            printf(" %s=%d", Abc_ObjName(pNode), pModel[i]);
        printf("\n");
    }

    ABC_FREE( pValues );    

    return cex;
}

static int
Abc_NtkCecSat_saucy( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int * pModel )
{
    extern Abc_Ntk_t * Abc_NtkMulti( Abc_Ntk_t * pNtk, int nThresh, int nFaninMax, int fCnf, int fMulti, int fSimple, int fFactor );
    Abc_Ntk_t * pMiter;
    Abc_Ntk_t * pCnf;
    int RetValue;
    int nConfLimit;
    int nInsLimit;
    int i;

    nConfLimit = 10000;
    nInsLimit = 0;  

    /* get the miter of the two networks */
    pMiter = Abc_NtkMiter( pNtk1, pNtk2, 1, 0, 0, 0 );
    if ( pMiter == NULL )
    {
        printf( "Miter computation has failed.\n" );
        exit(1);
    }
    RetValue = Abc_NtkMiterIsConstant( pMiter );
    if ( RetValue == 0 )
    {
        //printf( "Networks are NOT EQUIVALENT after structural hashing.\n" );
        /* report the error */
        pMiter->pModel = Abc_NtkVerifyGetCleanModel( pMiter, 1 );       
        for (i = 0; i < Abc_NtkPiNum(pNtk1); i++)
            pModel[i] = pMiter->pModel[i];  
        ABC_FREE( pMiter->pModel );
        Abc_NtkDelete( pMiter );
        return 0;
    }
    if ( RetValue == 1 )
    {
        Abc_NtkDelete( pMiter );
        //printf( "Networks are equivalent after structural hashing.\n" );
        return 1;
    }

    /* convert the miter into a CNF */
    pCnf = Abc_NtkMulti( pMiter, 0, 100, 1, 0, 0, 0 );
    Abc_NtkDelete( pMiter );
    if ( pCnf == NULL )
    {
        printf( "Renoding for CNF has failed.\n" );
        exit(1);
    }

    /* solve the CNF using the SAT solver */
    RetValue = Abc_NtkMiterSat( pCnf, (ABC_INT64_T)nConfLimit, (ABC_INT64_T)nInsLimit, 0, NULL, NULL );
    if ( RetValue == -1 ) {
        printf( "Networks are undecided (SAT solver timed out).\n" );
        exit(1);
    }
    /*else if ( RetValue == 0 )
        printf( "Networks are NOT EQUIVALENT after SAT.\n" );
    else
        printf( "Networks are equivalent after SAT.\n" );*/
    if ( pCnf->pModel ) {       
        for (i = 0; i < Abc_NtkPiNum(pNtk1); i++)
            pModel[i] = pCnf->pModel[i];
    }
    ABC_FREE( pCnf->pModel );
    Abc_NtkDelete( pCnf );

    return RetValue;
}


void saucyGateWay( Abc_Ntk_t * pNtkOrig, Abc_Obj_t * pNodePo, FILE * gFile, int fBooleanMatching, 
                   int fLookForSwaps, int fFixOutputs, int fFixInputs, int fQuiet, int fPrintTree )
{
    Abc_Ntk_t * pNtk;
    struct saucy *s;
    struct saucy_stats stats;
    int *colors;
    int i, clk = clock();   
    
    if (pNodePo == NULL)
        pNtk = Abc_NtkDup( pNtkOrig );
    else
        pNtk = Abc_NtkCreateCone( pNtkOrig, Abc_ObjFanin0(pNodePo), Abc_ObjName(pNodePo), 0 );
    
    if (Abc_NtkPiNum(pNtk) == 0) {
        Abc_Print( 0, "This output is not dependent on any input\n" );
        Abc_NtkDelete( pNtk );
        return;
    }

    s = saucy_alloc( pNtk );    

    /******* Getting Dependencies *******/  
    printf("Build functional dependency graph (dependency stats are below) ... ");      
    getDependencies( pNtk, s->iDep, s->oDep );
    printf("\t--------------------\n");
    /************************************/

    /* Finding toplogical orde */
    s->topOrder = findTopologicalOrder( pNtk );                 

    /* Setting graph colors: outputs = 0 and inputs = 1 */
    colors = ints(Abc_NtkPoNum(pNtk) + Abc_NtkPiNum(pNtk));
    if (fFixOutputs) {
        for (i = 0; i < Abc_NtkPoNum(pNtk); i++)
            colors[i] = i;
    } else {
        for (i = 0; i < Abc_NtkPoNum(pNtk); i++)
            colors[i] = 0;
    }
    if (fFixInputs) {
        int c = (fFixOutputs) ? Abc_NtkPoNum(pNtk) : 1;
        for (i = 0; i < Abc_NtkPiNum(pNtk); i++)
            colors[i+Abc_NtkPoNum(pNtk)] = c+i;     
    } else {
        int c = (fFixOutputs) ? Abc_NtkPoNum(pNtk) : 1;
        for (i = 0; i < Abc_NtkPiNum(pNtk); i++)
            colors[i+Abc_NtkPoNum(pNtk)] = c;   
    }   

    /* Are we looking for Boolean matching? */
    s->fBooleanMatching = fBooleanMatching;
    if (fBooleanMatching) {
        NUM_SIM1_ITERATION = 50;
        NUM_SIM2_ITERATION = 50;
    } else {
        NUM_SIM1_ITERATION = 200;
        NUM_SIM2_ITERATION = 200;
    }

    /* Set the print automorphism routine */
    if (!fQuiet)
        s->print_automorphism = print_automorphism_ntk;
    else
        s->print_automorphism = print_automorphism_quiet;

    /* Set the output file for generators */
    if (gFile == NULL)
        s->gFile = stdout;
    else
        s->gFile = gFile;

    /* Set print tree option */
    s->fPrintTree = fPrintTree;

    /* Set input permutations option */
    s->fLookForSwaps = fLookForSwaps;

    saucy_search(pNtk, s, 0, colors, &stats);   
    print_stats(stdout, stats);
    if (fBooleanMatching) {
        if (stats.grpsize_base > 1 || stats.grpsize_exp > 0)
            printf("*** Networks are equivalent ***\n");
        else
            printf("*** Networks are NOT equivalent ***\n");
    }
    saucy_free(s);
    Abc_NtkDelete(pNtk);

    if (1) {
        FILE * hadi = fopen("hadi.txt", "a");
        fprintf(hadi, "group size = %fe%d\n",
        stats.grpsize_base, stats.grpsize_exp); 
        fclose(hadi);
    }

    ABC_PRT( "Runtime", clock() - clk );

}ABC_NAMESPACE_IMPL_END