summaryrefslogtreecommitdiffstats
path: root/src/misc/espresso/sharp.c
blob: 53435078f52c4603a5fb786bfe0a5d606afe7d53 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
/*
 * Revision Control Information
 *
 * $Source$
 * $Author$
 * $Revision$
 * $Date$
 *
 */
/*
    sharp.c -- perform sharp, disjoint sharp, and intersection
*/

#include "espresso.h"

long start_time;


/* cv_sharp -- form the sharp product between two covers */
pcover cv_sharp(A, B)
pcover A, B;
{
    pcube last, p;
    pcover T;

    T = new_cover(0);
    foreach_set(A, last, p)
    T = sf_union(T, cb_sharp(p, B));
    return T;
}


/* cb_sharp -- form the sharp product between a cube and a cover */
pcover cb_sharp(c, T)
pcube c;
pcover T;
{
    if (T->count == 0) {
    T = sf_addset(new_cover(1), c);
    } else {
    start_time = ptime();
    T = cb_recur_sharp(c, T, 0, T->count-1, 0);
    }
    return T;
}


/* recursive formulation to provide balanced merging */
pcover cb_recur_sharp(c, T, first, last, level)
pcube c;
pcover T;
int first, last, level;
{
    pcover temp, left, right;
    int middle;

    if (first == last) {
    temp = sharp(c, GETSET(T, first));
    } else {
    middle = (first + last) / 2;
    left = cb_recur_sharp(c, T, first, middle, level+1);
    right = cb_recur_sharp(c, T, middle+1, last, level+1);
    temp = cv_intersect(left, right);
    if ((debug & SHARP) && level < 4) {
        printf("# SHARP[%d]: %4d = %4d x %4d, time = %s\n",
        level, temp->count, left->count, right->count,
        print_time(ptime() - start_time));
        (void) fflush(stdout);
    }
    free_cover(left);
    free_cover(right);
    }
    return temp;
}


/* sharp -- form the sharp product between two cubes */
pcover sharp(a, b)
pcube a, b;
{
    register int var;
    register pcube d=cube.temp[0], temp=cube.temp[1], temp1=cube.temp[2];
    pcover r = new_cover(cube.num_vars);

    if (cdist0(a, b)) {
    set_diff(d, a, b);
    for(var = 0; var < cube.num_vars; var++) {
        if (! setp_empty(set_and(temp, d, cube.var_mask[var]))) {
        set_diff(temp1, a, cube.var_mask[var]);
        set_or(GETSET(r, r->count++), temp, temp1);
        }
    }
    } else {
    r = sf_addset(r, a);
    }
    return r;
}

pcover make_disjoint(A)
pcover A;
{
    pcover R, new;
    register pset last, p;

    R = new_cover(0);
    foreach_set(A, last, p) {
    new = cb_dsharp(p, R);
    R = sf_append(R, new);
    }
    return R;
}


/* cv_dsharp -- disjoint-sharp product between two covers */
pcover cv_dsharp(A, B)
pcover A, B;
{
    register pcube last, p;
    pcover T;

    T = new_cover(0);
    foreach_set(A, last, p) {
    T = sf_union(T, cb_dsharp(p, B));
    }
    return T;
}


/* cb1_dsharp -- disjoint-sharp product between a cover and a cube */
pcover cb1_dsharp(T, c)
pcover T;
pcube c;
{
    pcube last, p;
    pcover R;

    R = new_cover(T->count);
    foreach_set(T, last, p) {
    R = sf_union(R, dsharp(p, c));
    }
    return R;
}


/* cb_dsharp -- disjoint-sharp product between a cube and a cover */
pcover cb_dsharp(c, T)
pcube c;
pcover T;
{
    pcube last, p;
    pcover Y, Y1;

    if (T->count == 0) {
    Y = sf_addset(new_cover(1), c);
    } else {
    Y = new_cover(T->count);
    set_copy(GETSET(Y,Y->count++), c);
    foreach_set(T, last, p) {
        Y1 = cb1_dsharp(Y, p);
        free_cover(Y);
        Y = Y1;
    }
    }
    return Y;
}


/* dsharp -- form the disjoint-sharp product between two cubes */
pcover dsharp(a, b)
pcube a, b;
{
    register pcube mask, diff, and, temp, temp1 = cube.temp[0];
    int var;
    pcover r;

    r = new_cover(cube.num_vars);

    if (cdist0(a, b)) {
    diff = set_diff(new_cube(), a, b);
    and = set_and(new_cube(), a, b);
    mask = new_cube();
    for(var = 0; var < cube.num_vars; var++) {
        /* check if position var of "a and not b" is not empty */
        if (! setp_disjoint(diff, cube.var_mask[var])) {

        /* coordinate var equals the difference between a and b */
        temp = GETSET(r, r->count++);
        (void) set_and(temp, diff, cube.var_mask[var]);

        /* coordinates 0 ... var-1 equal the intersection */
        INLINEset_and(temp1, and, mask);
        INLINEset_or(temp, temp, temp1);

        /* coordinates var+1 .. cube.num_vars equal a */
        set_or(mask, mask, cube.var_mask[var]);
        INLINEset_diff(temp1, a, mask);
        INLINEset_or(temp, temp, temp1);
        }
    }
    free_cube(diff);
    free_cube(and);
    free_cube(mask);
    } else {
    r = sf_addset(r, a);
    }
    return r;
}

/* cv_intersect -- form the intersection of two covers */

#define MAGIC 500               /* save 500 cubes before containment */

pcover cv_intersect(A, B)
pcover A, B;
{
    register pcube pi, pj, lasti, lastj, pt;
    pcover T, Tsave = NULL;

    /* How large should each temporary result cover be ? */
    T = new_cover(MAGIC);
    pt = T->data;

    /* Form pairwise intersection of each cube of A with each cube of B */
    foreach_set(A, lasti, pi) {
    foreach_set(B, lastj, pj) {
        if (cdist0(pi, pj)) {
        (void) set_and(pt, pi, pj);
        if (++T->count >= T->capacity) {
            if (Tsave == NULL)
            Tsave = sf_contain(T);
            else
            Tsave = sf_union(Tsave, sf_contain(T));
            T = new_cover(MAGIC);
            pt = T->data;
        } else
            pt += T->wsize;
        }
    }
    }


    if (Tsave == NULL)
    Tsave = sf_contain(T);
    else
    Tsave = sf_union(Tsave, sf_contain(T));
    return Tsave;
}