Version abc70930

1 files changed, 0 insertions, 624 deletions

diff --git a/src/misc/espresso/opo.c b/src/misc/espresso/opo.c
deleted file mode 100644
index 8daa0771..00000000
--- a/src/misc/espresso/opo.c
+++ /dev/null
@@ -1,624 +0,0 @@
-/*
- * Revision Control Information
- *
- * $Source$
- * $Author$
- * $Revision$
- * $Date$
- *
- */
-#include "espresso.h"
-
-/*
- *   Phase assignment technique (T. Sasao):
- *
- *      1. create a function with 2*m outputs which implements the
- *      original function and its complement for each output
- *
- *      2. minimize this function
- *
- *      3. choose the minimum number of prime implicants from the
- *      result of step 2 which are needed to realize either a function
- *      or its complement for each output
- *
- *  Step 3 is performed in a rather crude way -- by simply multiplying
- *  out a large expression of the form:
- *
- *      I = (ab + cdef)(acd + bgh) ...
- *
- *  which is a product of m expressions where each expression has two
- *  product terms -- one representing which primes are needed for the
- *  function, and one representing which primes are needed for the
- *  complement.  The largest product term resulting shows which primes
- *  to keep to implement one function or the other for each output.
- *  For problems with many outputs, this may grind to a
- *  halt.
- *
- *  Untried: form complement of I and use unate_complement ...
- *
- *  I have unsuccessfully tried several modifications to the basic
- *  algorithm.  The first is quite simple: use Sasao's technique, but
- *  only commit to a single output at a time (rather than all
- *  outputs).  The goal would be that the later minimizations can "take
- *  into account" the partial assignment at each step.  This is
- *  expensive (m+1 minimizations rather than 2), and the results are
- *  discouraging.
- *
- *  The second modification is rather complicated.  The result from the
- *  minimization in step 2 is guaranteed to be minimal.  Hence, for
- *  each output, the set of primes with a 1 in that output are both
- *  necessary and sufficient to implement the function.  Espresso
- *  achieves the minimality using the routine MAKE_SPARSE.  The
- *  modification is to prevent MAKE_SPARSE from running.  Hence, there
- *  are potentially many subsets of the set of primes with a 1 in a
- *  column which can be used to implement that output.  We use
- *  IRREDUNDANT to enumerate all possible subsets and then proceed as
- *  before.
- */
-
-static int opo_no_make_sparse;
-static int opo_repeated;
-static int opo_exact;
-static void minimize();
-
-void phase_assignment(PLA, opo_strategy)
-pPLA PLA;
-int opo_strategy;
-{
-    opo_no_make_sparse = opo_strategy % 2;
-    skip_make_sparse = opo_no_make_sparse;
-    opo_repeated = (opo_strategy / 2) % 2;
-    opo_exact = (opo_strategy / 4) % 2;
-
-    /* Determine a phase assignment */
-    if (PLA->phase != NULL) {
-    FREE(PLA->phase);
-    }
-
-    if (opo_repeated) {
-    PLA->phase = set_save(cube.fullset);
-    repeated_phase_assignment(PLA);
-    } else {
-    PLA->phase = find_phase(PLA, 0, (pcube) NULL);
-    }
-
-    /* Now minimize with this assignment */
-    skip_make_sparse = FALSE;
-    (void) set_phase(PLA);
-    minimize(PLA);
-}
-
-/*
- *  repeated_phase_assignment -- an alternate strategy which commits
- *  to a single phase assignment a step at a time.  Performs m + 1
- *  minimizations !
- */
-void repeated_phase_assignment(PLA)
-pPLA PLA;
-{
-    int i;
-    pcube phase;
-
-    for(i = 0; i < cube.part_size[cube.output]; i++) {
-
-    /* Find best assignment for all undecided outputs */
-    phase = find_phase(PLA, i, PLA->phase);
-
-    /* Commit for only a single output ... */
-    if (! is_in_set(phase, cube.first_part[cube.output] + i)) {
-        set_remove(PLA->phase, cube.first_part[cube.output] + i);
-    }
-
-    if (trace || summary) {
-        printf("\nOPO loop for output #%d\n", i);
-        printf("PLA->phase is %s\n", pc1(PLA->phase));
-        printf("phase      is %s\n", pc1(phase));
-    }
-    set_free(phase);
-    }
-}
-
-
-/*
- *  find_phase -- find a phase assignment for the PLA for all outputs starting
- *  with output number first_output.
- */
-pcube find_phase(PLA, first_output, phase1)
-pPLA PLA;
-int first_output;
-pcube phase1;
-{
-    pcube phase;
-    pPLA PLA1;
-
-    phase = set_save(cube.fullset);
-
-    /* setup the double-phase characteristic function, resize the cube */
-    PLA1 = new_PLA();
-    PLA1->F = sf_save(PLA->F);
-    PLA1->R = sf_save(PLA->R);
-    PLA1->D = sf_save(PLA->D);
-    if (phase1 != NULL) {
-    PLA1->phase = set_save(phase1);
-    (void) set_phase(PLA1);
-    }
-    EXEC_S(output_phase_setup(PLA1, first_output), "OPO-SETUP ", PLA1->F);
-
-    /* minimize the double-phase function */
-    minimize(PLA1);
-
-    /* set the proper phases according to what gives a minimum solution */
-    EXEC_S(PLA1->F = opo(phase, PLA1->F, PLA1->D, PLA1->R, first_output),
-        "OPO       ", PLA1->F);
-    free_PLA(PLA1);
-
-    /* set the cube structure to reflect the old size */
-    setdown_cube();
-    cube.part_size[cube.output] -=
-    (cube.part_size[cube.output] - first_output) / 2;
-    cube_setup();
-
-    return phase;
-}
-
-/*
- *  opo -- multiply the expression out to determine a minimum subset of
- *  primes.
- */
-
-/*ARGSUSED*/
-pcover opo(phase, T, D, R, first_output)
-pcube phase;
-pcover T, D, R;
-int first_output;
-{
-    int offset, output, i, last_output, ind;
-    pset pdest, select, p, p1, last, last1, not_covered, tmp;
-    pset_family temp, T1, T2;
-
-    /* must select all primes for outputs [0 .. first_output-1] */
-    select = set_full(T->count);
-    for(output = 0; output < first_output; output++) {
-    ind = cube.first_part[cube.output] + output;
-    foreachi_set(T, i, p) {
-        if (is_in_set(p, ind)) {
-        set_remove(select, i);
-        }
-    }
-    }
-
-    /* Recursively perform the intersections */
-    offset = (cube.part_size[cube.output] - first_output) / 2;
-    last_output = first_output + offset - 1;
-    temp = opo_recur(T, D, select, offset, first_output, last_output);
-
-    /* largest set is on top -- select primes which are inferred from it */
-    pdest = temp->data;
-    T1 = new_cover(T->count);
-    foreachi_set(T, i, p) {
-    if (! is_in_set(pdest, i)) {
-        T1 = sf_addset(T1, p);
-    }
-    }
-
-    set_free(select);
-    sf_free(temp);
-
-    /* finding phases is difficult -- see which functions are not covered */
-    T2 = complement(cube1list(T1));
-    not_covered = new_cube();
-    tmp = new_cube();
-    foreach_set(T, last, p) {
-    foreach_set(T2, last1, p1) {
-        if (cdist0(p, p1)) {
-        (void) set_or(not_covered, not_covered, set_and(tmp, p, p1));
-        }
-    }
-    }
-    free_cover(T);
-    free_cover(T2);
-    set_free(tmp);
-
-    /* Now reflect the phase choice in a single cube */
-    for(output = first_output; output <= last_output; output++) {
-    ind = cube.first_part[cube.output] + output;
-    if (is_in_set(not_covered, ind)) {
-        if (is_in_set(not_covered, ind + offset)) {
-        fatal("error in output phase assignment");
-        } else {
-        set_remove(phase, ind);
-        }
-    }
-    }
-    set_free(not_covered);
-    return T1;
-}
-
-pset_family opo_recur(T, D, select, offset, first, last)
-pcover T, D;
-pcube select;
-int offset, first, last;
-{
-    static int level = 0;
-    int middle;
-    pset_family sl, sr, temp;
-
-    level++;
-    if (first == last) {
-#if 0
-    if (opo_no_make_sparse) {
-        temp = form_cover_table(T, D, select, first, first + offset);
-    } else {
-        temp = opo_leaf(T, select, first, first + offset);
-    }
-#else
-    temp = opo_leaf(T, select, first, first + offset);
-#endif
-    } else {
-    middle = (first + last) / 2;
-    sl = opo_recur(T, D, select, offset, first, middle);
-    sr = opo_recur(T, D, select, offset, middle+1, last);
-    temp = unate_intersect(sl, sr, level == 1);
-    if (trace) {
-        printf("# OPO[%d]: %4d = %4d x %4d, time = %s\n", level - 1,
-        temp->count, sl->count, sr->count, print_time(ptime()));
-        (void) fflush(stdout);
-    }
-    free_cover(sl);
-    free_cover(sr);
-    }
-    level--;
-    return temp;
-}
-
-
-pset_family opo_leaf(T, select, out1, out2)
-register pcover T;
-pset select;
-int out1, out2;
-{
-    register pset_family temp;
-    register pset p, pdest;
-    register int i;
-
-    out1 += cube.first_part[cube.output];
-    out2 += cube.first_part[cube.output];
-
-    /* Allocate space for the result */
-    temp = sf_new(2, T->count);
-
-    /* Find which primes are needed for the ON-set of this fct */
-    pdest = GETSET(temp, temp->count++);
-    (void) set_copy(pdest, select);
-    foreachi_set(T, i, p) {
-    if (is_in_set(p, out1)) {
-        set_remove(pdest, i);
-    }
-    }
-
-    /* Find which primes are needed for the OFF-set of this fct */
-    pdest = GETSET(temp, temp->count++);
-    (void) set_copy(pdest, select);
-    foreachi_set(T, i, p) {
-    if (is_in_set(p, out2)) {
-        set_remove(pdest, i);
-    }
-    }
-
-    return temp;
-}
-
-#if 0
-pset_family form_cover_table(F, D, select, f, fbar)
-pcover F, D;
-pset select;
-int f, fbar;        /* indices of f and fbar in the output part */
-{
-    register int i;
-    register pcube p;
-    pset_family f_table, fbar_table;
-
-    /* setup required for fcube_is_covered */
-    Rp_size = F->count;
-    Rp_start = set_new(Rp_size);
-    foreachi_set(F, i, p) {
-    PUTSIZE(p, i);
-    }
-    foreachi_set(D, i, p) {
-    RESET(p, REDUND);
-    }
-
-    f_table = find_covers(F, D, select, f);
-    fbar_table = find_covers(F, D, select, fbar);
-    f_table = sf_append(f_table, fbar_table);
-
-    set_free(Rp_start);
-    return f_table;
-}
-
-
-pset_family find_covers(F, D, select, n)
-pcover F, D;
-register pset select;
-int n;
-{
-    register pset p, last, new;
-    pcover F1;
-    pcube *Flist;
-    pset_family f_table, table;
-    int i;
-
-    n += cube.first_part[cube.output];
-
-    /* save cubes in this output, and remove the output variable */
-    F1 = new_cover(F->count);
-    foreach_set(F, last, p)
-    if (is_in_set(p, n)) {
-        new = GETSET(F1, F1->count++);
-        set_or(new, p, cube.var_mask[cube.output]);
-        PUTSIZE(new, SIZE(p));
-        SET(new, REDUND);
-    }
-
-    /* Find ways (sop form) to fail to cover output indexed by n */
-    Flist = cube2list(F1, D);
-    table = sf_new(10, Rp_size);
-    foreach_set(F1, last, p) {
-    set_fill(Rp_start, Rp_size);
-    set_remove(Rp_start, SIZE(p));
-    table = sf_append(table, fcube_is_covered(Flist, p));
-    RESET(p, REDUND);
-    }
-    set_fill(Rp_start, Rp_size);
-    foreach_set(table, last, p) {
-    set_diff(p, Rp_start, p);
-    }
-
-    /* complement this to get possible ways to cover the function */
-    for(i = 0; i < Rp_size; i++) {
-    if (! is_in_set(select, i)) {
-        p = set_new(Rp_size);
-        set_insert(p, i);
-        table = sf_addset(table, p);
-        set_free(p);
-    }
-    }
-    f_table = unate_compl(table);
-
-    /* what a pain, but we need bitwise complement of this */
-    set_fill(Rp_start, Rp_size);
-    foreach_set(f_table, last, p) {
-    set_diff(p, Rp_start, p);
-    }
-
-    free_cubelist(Flist);
-    sf_free(F1);
-    return f_table;
-}
-#endif
-
-/*
- *  Take a PLA (ON-set, OFF-set and DC-set) and create the
- *  "double-phase characteristic function" which is merely a new
- *  function which has twice as many outputs and realizes both the
- *  function and the complement.
- *
- *  The cube structure is assumed to represent the PLA upon entering.
- *  It will be modified to represent the double-phase function upon
- *  exit.
- *
- *  Only the outputs numbered starting with "first_output" are
- *  duplicated in the output part
- */
-
-output_phase_setup(PLA, first_output)
-INOUT pPLA PLA;
-int first_output;
-{
-    pcover F, R, D;
-    pcube mask, mask1, last;
-    int first_part, offset;
-    bool save;
-    register pcube p, pr, pf;
-    register int i, last_part;
-
-    if (cube.output == -1)
-    fatal("output_phase_setup: must have an output");
-
-    F = PLA->F;
-    D = PLA->D;
-    R = PLA->R;
-    first_part = cube.first_part[cube.output] + first_output;
-    last_part = cube.last_part[cube.output];
-    offset = cube.part_size[cube.output] - first_output;
-
-    /* Change the output size, setup the cube structure */
-    setdown_cube();
-    cube.part_size[cube.output] += offset;
-    cube_setup();
-
-    /* Create a mask to select that part of the cube which isn't changing */
-    mask = set_save(cube.fullset);
-    for(i = first_part; i < cube.size; i++)
-    set_remove(mask, i);
-    mask1 = set_save(mask);
-    for(i = cube.first_part[cube.output]; i < first_part; i++) {
-    set_remove(mask1, i);
-    }
-
-    PLA->F = new_cover(F->count + R->count);
-    PLA->R = new_cover(F->count + R->count);
-    PLA->D = new_cover(D->count);
-
-    foreach_set(F, last, p) {
-    pf = GETSET(PLA->F, (PLA->F)->count++);
-    pr = GETSET(PLA->R, (PLA->R)->count++);
-    INLINEset_and(pf, mask, p);
-    INLINEset_and(pr, mask1, p);
-    for(i = first_part; i <= last_part; i++)
-        if (is_in_set(p, i))
-        set_insert(pf, i);
-    save = FALSE;
-    for(i = first_part; i <= last_part; i++)
-        if (is_in_set(p, i))
-        save = TRUE, set_insert(pr, i+offset);
-    if (! save) PLA->R->count--;
-    }
-
-    foreach_set(R, last, p) {
-    pf = GETSET(PLA->F, (PLA->F)->count++);
-    pr = GETSET(PLA->R, (PLA->R)->count++);
-    INLINEset_and(pf, mask1, p);
-    INLINEset_and(pr, mask, p);
-    save = FALSE;
-    for(i = first_part; i <= last_part; i++)
-        if (is_in_set(p, i))
-        save = TRUE, set_insert(pf, i+offset);
-    if (! save) PLA->F->count--;
-    for(i = first_part; i <= last_part; i++)
-        if (is_in_set(p, i))
-        set_insert(pr, i);
-    }
-
-    foreach_set(D, last, p) {
-    pf = GETSET(PLA->D, (PLA->D)->count++);
-    INLINEset_and(pf, mask, p);
-    for(i = first_part; i <= last_part; i++)
-        if (is_in_set(p, i)) {
-        set_insert(pf, i);
-        set_insert(pf, i+offset);
-        }
-    }
-
-    free_cover(F);
-    free_cover(D);
-    free_cover(R);
-    set_free(mask);
-    set_free(mask1);
-}
-
-/*
- *  set_phase -- given a "cube" which describes which phases of the output
- *  are to be implemented, compute the appropriate on-set and off-set
- */
-pPLA set_phase(PLA)
-INOUT pPLA PLA;
-{
-    pcover F1, R1;
-    register pcube last, p, outmask;
-    register pcube temp=cube.temp[0], phase=PLA->phase, phase1=cube.temp[1];
-
-    outmask = cube.var_mask[cube.num_vars - 1];
-    set_diff(phase1, outmask, phase);
-    set_or(phase1, set_diff(temp, cube.fullset, outmask), phase1);
-    F1 = new_cover((PLA->F)->count + (PLA->R)->count);
-    R1 = new_cover((PLA->F)->count + (PLA->R)->count);
-
-    foreach_set(PLA->F, last, p) {
-    if (! setp_disjoint(set_and(temp, p, phase), outmask))
-        set_copy(GETSET(F1, F1->count++), temp);
-    if (! setp_disjoint(set_and(temp, p, phase1), outmask))
-        set_copy(GETSET(R1, R1->count++), temp);
-    }
-    foreach_set(PLA->R, last, p) {
-    if (! setp_disjoint(set_and(temp, p, phase), outmask))
-        set_copy(GETSET(R1, R1->count++), temp);
-    if (! setp_disjoint(set_and(temp, p, phase1), outmask))
-        set_copy(GETSET(F1, F1->count++), temp);
-    }
-    free_cover(PLA->F);
-    free_cover(PLA->R);
-    PLA->F = F1;
-    PLA->R = R1;
-    return PLA;
-}
-
-#define POW2(x)        (1 << (x))
-
-void opoall(PLA, first_output, last_output, opo_strategy)
-pPLA PLA;
-int first_output, last_output;
-int opo_strategy;
-{
-    pcover F, D, R, best_F, best_D, best_R;
-    int i, j, ind, num;
-    pcube bestphase;
-
-    opo_exact = opo_strategy;
-
-    if (PLA->phase != NULL) {
-    set_free(PLA->phase);
-    }
-
-    bestphase = set_save(cube.fullset);
-    best_F = sf_save(PLA->F);
-    best_D = sf_save(PLA->D);
-    best_R = sf_save(PLA->R);
-
-    for(i = 0; i < POW2(last_output - first_output + 1); i++) {
-
-    /* save the initial PLA covers */
-    F = sf_save(PLA->F);
-    D = sf_save(PLA->D);
-    R = sf_save(PLA->R);
-
-    /* compute the phase cube for this iteration */
-    PLA->phase = set_save(cube.fullset);
-    num = i;
-    for(j = last_output; j >= first_output; j--) {
-        if (num % 2 == 0) {
-        ind = cube.first_part[cube.output] + j;
-        set_remove(PLA->phase, ind);
-        }
-        num /= 2;
-    }
-
-    /* set the phase and minimize */
-    (void) set_phase(PLA);
-    printf("# phase is %s\n", pc1(PLA->phase));
-    summary = TRUE;
-    minimize(PLA);
-
-    /* see if this is the best so far */
-    if (PLA->F->count < best_F->count) {
-        /* save new best solution */
-        set_copy(bestphase, PLA->phase);
-        sf_free(best_F);
-        sf_free(best_D);
-        sf_free(best_R);
-        best_F = PLA->F;
-        best_D = PLA->D;
-        best_R = PLA->R;
-    } else {
-        /* throw away the solution */
-        free_cover(PLA->F);
-        free_cover(PLA->D);
-        free_cover(PLA->R);
-    }
-    set_free(PLA->phase);
-
-    /* restore the initial PLA covers */
-    PLA->F = F;
-    PLA->D = D;
-    PLA->R = R;
-    }
-
-    /* one more minimization to restore the best answer */
-    PLA->phase = bestphase;
-    sf_free(PLA->F);
-    sf_free(PLA->D);
-    sf_free(PLA->R);
-    PLA->F = best_F;
-    PLA->D = best_D;
-    PLA->R = best_R;
-}
-
-static void minimize(PLA)
-pPLA PLA;
-{
-    if (opo_exact) {
-    EXEC_S(PLA->F = minimize_exact(PLA->F,PLA->D,PLA->R,1), "EXACT", PLA->F);
-    } else {
-    EXEC_S(PLA->F = espresso(PLA->F, PLA->D, PLA->R), "ESPRESSO  ",PLA->F);
-    }
-}