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/*
* Copyright 2008-2009 Katholieke Universiteit Leuven
*
* Use of this software is governed by the MIT license
*
* Written by Sven Verdoolaege, K.U.Leuven, Departement
* Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
*/
#include <assert.h>
#include <string.h>
#include <isl_map_private.h>
#include <isl/aff.h>
#include <isl/set.h>
#include "isl_tab.h"
#include "isl_sample.h"
#include "isl_scan.h"
#include <isl_seq.h>
#include <isl_ilp_private.h>
#include <isl/printer.h>
#include <isl_point_private.h>
#include <isl_vec_private.h>
#include <isl/options.h>
#include <isl_config.h>
/* The input of this program is the same as that of the "example" program
* from the PipLib distribution, except that the "big parameter column"
* should always be -1.
*
* Context constraints in PolyLib format
* -1
* Problem constraints in PolyLib format
* Optional list of options
*
* The options are
* Maximize compute maximum instead of minimum
* Rational compute rational optimum instead of integer optimum
* Urs_parms don't assume parameters are non-negative
* Urs_unknowns don't assume unknowns are non-negative
*/
struct options {
struct isl_options *isl;
unsigned verify;
unsigned format;
};
#define FORMAT_SET 0
#define FORMAT_AFF 1
struct isl_arg_choice pip_format[] = {
{"set", FORMAT_SET},
{"affine", FORMAT_AFF},
{0}
};
ISL_ARGS_START(struct options, options_args)
ISL_ARG_CHILD(struct options, isl, "isl", &isl_options_args, "isl options")
ISL_ARG_BOOL(struct options, verify, 'T', "verify", 0, NULL)
ISL_ARG_CHOICE(struct options, format, 0, "format",
pip_format, FORMAT_SET, "output format")
ISL_ARGS_END
ISL_ARG_DEF(options, struct options, options_args)
static __isl_give isl_basic_set *set_bounds(__isl_take isl_basic_set *bset)
{
isl_size nparam;
int i, r;
isl_point *pt, *pt2;
isl_basic_set *box;
nparam = isl_basic_set_dim(bset, isl_dim_param);
if (nparam < 0)
return isl_basic_set_free(bset);
r = nparam >= 8 ? 4 : nparam >= 5 ? 6 : 30;
pt = isl_basic_set_sample_point(isl_basic_set_copy(bset));
pt2 = isl_point_copy(pt);
for (i = 0; i < nparam; ++i) {
pt = isl_point_add_ui(pt, isl_dim_param, i, r);
pt2 = isl_point_sub_ui(pt2, isl_dim_param, i, r);
}
box = isl_basic_set_box_from_points(pt, pt2);
return isl_basic_set_intersect(bset, box);
}
static __isl_give isl_basic_set *to_parameter_domain(
__isl_take isl_basic_set *context)
{
isl_size dim;
dim = isl_basic_set_dim(context, isl_dim_set);
if (dim < 0)
return isl_basic_set_free(context);
context = isl_basic_set_move_dims(context, isl_dim_param, 0,
isl_dim_set, 0, dim);
context = isl_basic_set_params(context);
return context;
}
/* If "context" has more parameters than "bset", then reinterpret
* the last dimensions of "bset" as parameters.
*/
static __isl_give isl_basic_set *move_parameters(__isl_take isl_basic_set *bset,
__isl_keep isl_basic_set *context)
{
isl_size nparam, nparam_bset, dim;
nparam = isl_basic_set_dim(context, isl_dim_param);
nparam_bset = isl_basic_set_dim(bset, isl_dim_param);
if (nparam < 0 | nparam_bset < 0)
return isl_basic_set_free(bset);
if (nparam == nparam_bset)
return bset;
dim = isl_basic_set_dim(bset, isl_dim_set);
if (dim < 0)
return isl_basic_set_free(bset);
bset = isl_basic_set_move_dims(bset, isl_dim_param, 0,
isl_dim_set, dim - nparam, nparam);
return bset;
}
/* Plug in the initial values of "params" for the parameters in "bset" and
* return the result. The remaining entries in "params", if any,
* correspond to the existentially quantified variables in the description
* of the original context and can be ignored.
*/
static __isl_give isl_basic_set *plug_in_parameters(
__isl_take isl_basic_set *bset, __isl_take isl_vec *params)
{
int i;
isl_size n;
n = isl_basic_set_dim(bset, isl_dim_param);
if (n < 0)
bset = isl_basic_set_free(bset);
for (i = 0; i < n; ++i)
bset = isl_basic_set_fix(bset,
isl_dim_param, i, params->el[1 + i]);
bset = isl_basic_set_remove_dims(bset, isl_dim_param, 0, n);
isl_vec_free(params);
return bset;
}
/* Plug in the initial values of "params" for the parameters in "set" and
* return the result. The remaining entries in "params", if any,
* correspond to the existentially quantified variables in the description
* of the original context and can be ignored.
*/
static __isl_give isl_set *set_plug_in_parameters(__isl_take isl_set *set,
__isl_take isl_vec *params)
{
int i;
isl_size n;
n = isl_set_dim(set, isl_dim_param);
if (n < 0)
set = isl_set_free(set);
for (i = 0; i < n; ++i)
set = isl_set_fix(set, isl_dim_param, i, params->el[1 + i]);
set = isl_set_remove_dims(set, isl_dim_param, 0, n);
isl_vec_free(params);
return set;
}
/* Compute the lexicographically minimal (or maximal if max is set)
* element of bset for the given values of the parameters, by
* successively solving an ilp problem in each direction.
*/
static __isl_give isl_vec *opt_at(__isl_take isl_basic_set *bset,
__isl_take isl_vec *params, int max)
{
isl_size dim;
isl_ctx *ctx;
struct isl_vec *opt;
struct isl_vec *obj;
int i;
dim = isl_basic_set_dim(bset, isl_dim_set);
if (dim < 0)
goto error;
bset = plug_in_parameters(bset, params);
ctx = isl_basic_set_get_ctx(bset);
if (isl_basic_set_plain_is_empty(bset)) {
opt = isl_vec_alloc(ctx, 0);
isl_basic_set_free(bset);
return opt;
}
opt = isl_vec_alloc(ctx, 1 + dim);
assert(opt);
obj = isl_vec_alloc(ctx, 1 + dim);
assert(obj);
isl_int_set_si(opt->el[0], 1);
isl_int_set_si(obj->el[0], 0);
for (i = 0; i < dim; ++i) {
enum isl_lp_result res;
isl_seq_clr(obj->el + 1, dim);
isl_int_set_si(obj->el[1 + i], 1);
res = isl_basic_set_solve_ilp(bset, max, obj->el,
&opt->el[1 + i], NULL);
if (res == isl_lp_empty)
goto empty;
assert(res == isl_lp_ok);
bset = isl_basic_set_fix(bset, isl_dim_set, i, opt->el[1 + i]);
}
isl_basic_set_free(bset);
isl_vec_free(obj);
return opt;
error:
isl_basic_set_free(bset);
isl_vec_free(params);
return NULL;
empty:
isl_vec_free(opt);
opt = isl_vec_alloc(ctx, 0);
isl_basic_set_free(bset);
isl_vec_free(obj);
return opt;
}
struct isl_scan_pip {
struct isl_scan_callback callback;
isl_basic_set *bset;
isl_set *sol;
isl_set *empty;
int stride;
int n;
int max;
};
/* Check if the "manually" computed optimum of bset at the "sample"
* values of the parameters agrees with the solution of pilp problem
* represented by the pair (sol, empty).
* In particular, if there is no solution for this value of the parameters,
* then it should be an element of the parameter domain "empty".
* Otherwise, the optimal solution, should be equal to the result of
* plugging in the value of the parameters in "sol".
*/
static isl_stat scan_one(struct isl_scan_callback *callback,
__isl_take isl_vec *sample)
{
struct isl_scan_pip *sp = (struct isl_scan_pip *)callback;
struct isl_vec *opt;
sp->n--;
opt = opt_at(isl_basic_set_copy(sp->bset), isl_vec_copy(sample), sp->max);
assert(opt);
if (opt->size == 0) {
isl_point *sample_pnt;
sample_pnt = isl_point_alloc(isl_set_get_space(sp->empty), sample);
assert(isl_set_contains_point(sp->empty, sample_pnt));
isl_point_free(sample_pnt);
isl_vec_free(opt);
} else {
isl_set *sol;
isl_set *opt_set;
opt_set = isl_set_from_basic_set(isl_basic_set_from_vec(opt));
sol = set_plug_in_parameters(isl_set_copy(sp->sol), sample);
assert(isl_set_is_equal(opt_set, sol));
isl_set_free(sol);
isl_set_free(opt_set);
}
if (!(sp->n % sp->stride)) {
printf("o");
fflush(stdout);
}
return sp->n >= 1 ? isl_stat_ok : isl_stat_error;
}
static void check_solution(isl_basic_set *bset, isl_basic_set *context,
isl_set *sol, isl_set *empty, int max)
{
struct isl_scan_pip sp;
isl_int count, count_max;
int i, n;
int r;
context = set_bounds(context);
context = isl_basic_set_underlying_set(context);
isl_int_init(count);
isl_int_init(count_max);
isl_int_set_si(count_max, 2000);
r = isl_basic_set_count_upto(context, count_max, &count);
assert(r >= 0);
n = isl_int_get_si(count);
isl_int_clear(count_max);
isl_int_clear(count);
sp.callback.add = scan_one;
sp.bset = bset;
sp.sol = sol;
sp.empty = empty;
sp.n = n;
sp.stride = n > 70 ? 1 + (n + 1)/70 : 1;
sp.max = max;
for (i = 0; i < n; i += sp.stride)
printf(".");
printf("\r");
fflush(stdout);
isl_basic_set_scan(context, &sp.callback);
printf("\n");
isl_basic_set_free(bset);
}
int main(int argc, char **argv)
{
struct isl_ctx *ctx;
struct isl_basic_set *context, *bset, *copy, *context_copy;
struct isl_set *set = NULL;
struct isl_set *empty;
isl_pw_multi_aff *pma = NULL;
int neg_one;
char s[1024];
int urs_parms = 0;
int urs_unknowns = 0;
int max = 0;
int rational = 0;
int n;
struct options *options;
options = options_new_with_defaults();
assert(options);
argc = options_parse(options, argc, argv, ISL_ARG_ALL);
ctx = isl_ctx_alloc_with_options(&options_args, options);
context = isl_basic_set_read_from_file(ctx, stdin);
assert(context);
n = fscanf(stdin, "%d", &neg_one);
assert(n == 1);
assert(neg_one == -1);
bset = isl_basic_set_read_from_file(ctx, stdin);
while (fgets(s, sizeof(s), stdin)) {
if (strncasecmp(s, "Maximize", 8) == 0)
max = 1;
if (strncasecmp(s, "Rational", 8) == 0) {
rational = 1;
bset = isl_basic_set_set_rational(bset);
}
if (strncasecmp(s, "Urs_parms", 9) == 0)
urs_parms = 1;
if (strncasecmp(s, "Urs_unknowns", 12) == 0)
urs_unknowns = 1;
}
if (!urs_parms)
context = isl_basic_set_intersect(context,
isl_basic_set_positive_orthant(isl_basic_set_get_space(context)));
context = to_parameter_domain(context);
bset = move_parameters(bset, context);
if (!urs_unknowns)
bset = isl_basic_set_intersect(bset,
isl_basic_set_positive_orthant(isl_basic_set_get_space(bset)));
if (options->verify) {
copy = isl_basic_set_copy(bset);
context_copy = isl_basic_set_copy(context);
}
if (options->format == FORMAT_AFF) {
if (max)
pma = isl_basic_set_partial_lexmax_pw_multi_aff(bset,
context, &empty);
else
pma = isl_basic_set_partial_lexmin_pw_multi_aff(bset,
context, &empty);
} else {
if (max)
set = isl_basic_set_partial_lexmax(bset,
context, &empty);
else
set = isl_basic_set_partial_lexmin(bset,
context, &empty);
}
if (options->verify) {
assert(!rational);
if (options->format == FORMAT_AFF)
set = isl_set_from_pw_multi_aff(pma);
check_solution(copy, context_copy, set, empty, max);
isl_set_free(set);
} else {
isl_printer *p;
p = isl_printer_to_file(ctx, stdout);
if (options->format == FORMAT_AFF)
p = isl_printer_print_pw_multi_aff(p, pma);
else
p = isl_printer_print_set(p, set);
p = isl_printer_end_line(p);
p = isl_printer_print_str(p, "no solution: ");
p = isl_printer_print_set(p, empty);
p = isl_printer_end_line(p);
isl_printer_free(p);
isl_set_free(set);
isl_pw_multi_aff_free(pma);
}
isl_set_free(empty);
isl_ctx_free(ctx);
return 0;
}
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