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 = isl_basic_map_total_dim(bmap);
  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 }