add convex hull computation
[platform/upstream/isl.git] / isl_lp_piplib.c
1 #include "isl_map.h"
2 #include "isl_lp.h"
3 #include "isl_piplib.h"
4 #include "isl_map_piplib.h"
5
6 enum isl_lp_result isl_pip_solve_lp(struct isl_basic_map *bmap, int maximize,
7                                       isl_int *f, isl_int denom, isl_int *opt,
8                                       isl_int *opt_denom)
9 {
10         enum isl_lp_result res = isl_lp_ok;
11         PipMatrix       *domain = NULL;
12         PipOptions      *options;
13         PipQuast        *sol;
14         unsigned         total;
15
16         total = bmap->nparam + bmap->n_in + bmap->n_out + bmap->n_div;
17         domain = isl_basic_map_to_pip(bmap, 0, 1, 0);
18         if (!domain)
19                 goto error;
20         entier_set_si(domain->p[0][1], -1);
21         isl_seq_cpy_to_pip(domain->p[0]+2, f, total);
22
23         options = pip_options_init();
24         if (!options)
25                 goto error;
26         options->Urs_unknowns = -1;
27         options->Maximize = maximize;
28         options->Nq = 0;
29         sol = pip_solve(domain, NULL, -1, options);
30         pip_options_free(options);
31         if (!sol)
32                 goto error;
33
34         if (!sol->list)
35                 res = isl_lp_empty;
36         else if (entier_zero_p(sol->list->vector->the_deno[0]))
37                 res = isl_lp_unbounded;
38         else {
39                 if (opt_denom) {
40                         isl_seq_cpy_from_pip(opt,
41                                  &sol->list->vector->the_vector[0], 1);
42                         isl_seq_cpy_from_pip(opt_denom,
43                                  &sol->list->vector->the_deno[0], 1);
44                 } else if (maximize)
45                         mpz_fdiv_q(*opt, sol->list->vector->the_vector[0],
46                                          sol->list->vector->the_deno[0]);
47                 else
48                         mpz_cdiv_q(*opt, sol->list->vector->the_vector[0],
49                                          sol->list->vector->the_deno[0]);
50         }
51         pip_matrix_free(domain);
52         pip_quast_free(sol);
53         return res;
54 error:
55         if (domain)
56                 pip_matrix_free(domain);
57         return isl_lp_error;
58 }