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/*
* Revision Control Information
*
* $Source$
* $Author$
* $Revision$
* $Date$
*
*/
#include "espresso.h"
static void dump_irredundant();
static pcover do_minimize();
/*
* minimize_exact -- main entry point for exact minimization
*
* Global flags which affect this routine are:
*
* debug
* skip_make_sparse
*/
pcover
minimize_exact(F, D, R, exact_cover)
pcover F, D, R;
int exact_cover;
{
return do_minimize(F, D, R, exact_cover, /*weighted*/ 0);
}
pcover
minimize_exact_literals(F, D, R, exact_cover)
pcover F, D, R;
int exact_cover;
{
return do_minimize(F, D, R, exact_cover, /*weighted*/ 1);
}
static pcover
do_minimize(F, D, R, exact_cover, weighted)
pcover F, D, R;
int exact_cover;
int weighted;
{
pcover newF, E, Rt, Rp;
pset p, last;
int heur, level, *weights, i;
sm_matrix *table;
sm_row *cover;
sm_element *pe;
int debug_save = debug;
if (debug & EXACT) {
debug |= (IRRED | MINCOV);
}
#if defined(sun) || defined(bsd4_2) /* hack ... */
if (debug & MINCOV) {
setlinebuf(stdout);
}
#endif
level = (debug & MINCOV) ? 4 : 0;
heur = ! exact_cover;
/* Generate all prime implicants */
EXEC(F = primes_consensus(cube2list(F, D)), "PRIMES ", F);
/* Setup the prime implicant table */
EXEC(irred_split_cover(F, D, &E, &Rt, &Rp), "ESSENTIALS ", E);
EXEC(table = irred_derive_table(D, E, Rp), "PI-TABLE ", Rp);
/* Solve either a weighted or nonweighted covering problem */
if (weighted) {
/* correct only for all 2-valued variables */
weights = ALLOC(int, F->count);
foreach_set(Rp, last, p) {
weights[SIZE(p)] = cube.size - set_ord(p);
/* We have added the 0's in the output part instead of the 1's.
This loop corrects the literal count. */
for (i = cube.first_part[cube.output];
i <= cube.last_part[cube.output]; i++) {
is_in_set(p, i) ? weights[SIZE(p)]++ : weights[SIZE(p)]--;
}
}
} else {
weights = NIL(int);
}
EXEC(cover=sm_minimum_cover(table,weights,heur,level), "MINCOV ", F);
if (weights != 0) {
FREE(weights);
}
if (debug & EXACT) {
dump_irredundant(E, Rt, Rp, table);
}
/* Form the result cover */
newF = new_cover(100);
foreach_set(E, last, p) {
newF = sf_addset(newF, p);
}
sm_foreach_row_element(cover, pe) {
newF = sf_addset(newF, GETSET(F, pe->col_num));
}
free_cover(E);
free_cover(Rt);
free_cover(Rp);
sm_free(table);
sm_row_free(cover);
free_cover(F);
/* Attempt to make the results more sparse */
debug &= ~ (IRRED | SHARP | MINCOV);
if (! skip_make_sparse && R != 0) {
newF = make_sparse(newF, D, R);
}
debug = debug_save;
return newF;
}
static void
dump_irredundant(E, Rt, Rp, table)
pcover E, Rt, Rp;
sm_matrix *table;
{
FILE *fp_pi_table, *fp_primes;
pPLA PLA;
pset last, p;
char *file;
if (filename == 0 || strcmp(filename, "(stdin)") == 0) {
fp_pi_table = fp_primes = stdout;
} else {
file = ALLOC(char, strlen(filename)+20);
(void) sprintf(file, "%s.primes", filename);
if ((fp_primes = fopen(file, "w")) == NULL) {
(void) fprintf(stderr, "espresso: Unable to open %s\n", file);
fp_primes = stdout;
}
(void) sprintf(file, "%s.pi", filename);
if ((fp_pi_table = fopen(file, "w")) == NULL) {
(void) fprintf(stderr, "espresso: Unable to open %s\n", file);
fp_pi_table = stdout;
}
FREE(file);
}
PLA = new_PLA();
PLA_labels(PLA);
fpr_header(fp_primes, PLA, F_type);
free_PLA(PLA);
(void) fprintf(fp_primes, "# Essential primes are\n");
foreach_set(E, last, p) {
(void) fprintf(fp_primes, "%s\n", pc1(p));
}
(void) fprintf(fp_primes, "# Totally redundant primes are\n");
foreach_set(Rt, last, p) {
(void) fprintf(fp_primes, "%s\n", pc1(p));
}
(void) fprintf(fp_primes, "# Partially redundant primes are\n");
foreach_set(Rp, last, p) {
(void) fprintf(fp_primes, "%s\n", pc1(p));
}
if (fp_primes != stdout) {
(void) fclose(fp_primes);
}
sm_write(fp_pi_table, table);
if (fp_pi_table != stdout) {
(void) fclose(fp_pi_table);
}
}
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