nsz Git - libfirm/blob - ir/be/becopyilp.c

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief       Common stuff used by all ILP formulations.
  23  * @author      Daniel Grund
  24  * @date        28.02.2006
  25  */
  26 #include "config.h"
  27
  28 #include <stdbool.h>
  29
  30 #include "irtools.h"
  31 #include "irprintf.h"
  32
  33 #include "bestatevent.h"
  34 #include "beirg.h"
  35 #include "bemodule.h"
  36 #include "error.h"
  37
  38 #include "lpp.h"
  39
  40 #include "lc_opts.h"
  41 #include "lc_opts_enum.h"
  42
  43 #define DUMP_ILP 1
  44 #define DUMP_SOL 2
  45
  46 static int time_limit = 60;
  47 static int solve_log  = 0;
  48 static unsigned dump_flags = 0;
  49
  50 static const lc_opt_enum_mask_items_t dump_items[] = {
  51         { "ilp",   DUMP_ILP },
  52         { "sol",   DUMP_SOL },
  53         { NULL,    0 }
  54 };
  55
  56 static lc_opt_enum_mask_var_t dump_var = {
  57         &dump_flags, dump_items
  58 };
  59
  60 static const lc_opt_table_entry_t options[] = {
  61         LC_OPT_ENT_INT      ("limit", "time limit for solving in seconds (0 for unlimited)", &time_limit),
  62         LC_OPT_ENT_BOOL     ("log",   "show ilp solving log",              &solve_log),
  63         LC_OPT_ENT_ENUM_MASK("dump",  "dump flags",             &dump_var),
  64         LC_OPT_LAST
  65 };
  66
  67 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_copyilp)
  68 void be_init_copyilp(void)
  69 {
  70         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
  71         lc_opt_entry_t *ra_grp = lc_opt_get_grp(be_grp, "ra");
  72         lc_opt_entry_t *chordal_grp = lc_opt_get_grp(ra_grp, "chordal");
  73         lc_opt_entry_t *co_grp = lc_opt_get_grp(chordal_grp, "co");
  74         lc_opt_entry_t *ilp_grp = lc_opt_get_grp(co_grp, "ilp");
  75
  76         lc_opt_add_table(ilp_grp, options);
  77 }
  78
  79 #include "becopyilp_t.h"
  80 #include "beifg.h"
  81
  82 /******************************************************************************
  83     _____ _                        _            _   _
  84    / ____(_)                      | |          | | (_)
  85   | (___  _ _______   _ __ ___  __| |_   _  ___| |_ _  ___  _ __
  86    \___ \| |_  / _ \ | '__/ _ \/ _` | | | |/ __| __| |/ _ \| '_ \
  87    ____) | |/ /  __/ | | |  __/ (_| | |_| | (__| |_| | (_) | | | |
  88   |_____/|_/___\___| |_|  \___|\__,_|\__,_|\___|\__|_|\___/|_| |_|
  89
  90  *****************************************************************************/
  91
  92
  93 size_red_t *new_size_red(copy_opt_t *co)
  94 {
  95         size_red_t *res = XMALLOC(size_red_t);
  96
  97         res->co = co;
  98         res->all_removed = pset_new_ptr_default();
  99         res->col_suff = NULL;
 100         obstack_init(&res->ob);
 101
 102         return res;
 103 }
 104
 105 /**
 106  * Checks if a node is simplicial in the graph heeding the already removed nodes.
 107  */
 108 static inline bool sr_is_simplicial(size_red_t *sr, const ir_node *ifn)
 109 {
 110         be_ifg_t *ifg  = sr->co->cenv->ifg;
 111         neighbours_iter_t iter;
 112         ir_node **all  = ALLOCAN(ir_node*, be_ifg_degree(ifg, ifn));
 113         ir_node  *curr;
 114         int       size = 0;
 115         int       i;
 116         int       o;
 117
 118         /* get all non-removed neighbors */
 119         be_ifg_foreach_neighbour(ifg, &iter, ifn, curr)
 120                 if (!sr_is_removed(sr, curr))
 121                         all[size++] = curr;
 122
 123         /* check if these form a clique */
 124         for (i=0; i<size; ++i)
 125                 for (o=i+1; o<size; ++o)
 126                         if (!be_ifg_connected(ifg, all[i], all[o]))
 127                                 return false;
 128
 129         /* all edges exist so this is a clique */
 130         return true;
 131 }
 132
 133 void sr_remove(size_red_t *sr)
 134 {
 135         ir_node *irn;
 136         bool redo = true;
 137         const be_ifg_t *ifg = sr->co->cenv->ifg;
 138         nodes_iter_t iter;
 139
 140         while (redo) {
 141                 redo = false;
 142                 be_ifg_foreach_node(ifg, &iter, irn) {
 143                         const arch_register_req_t *req = arch_get_irn_register_req(irn);
 144                         coloring_suffix_t *cs;
 145
 146                         if (arch_register_req_is(req, limited) || sr_is_removed(sr, irn))
 147                                 continue;
 148                         if (co_gs_is_optimizable(sr->co, irn))
 149                                 continue;
 150                         if (!sr_is_simplicial(sr, irn))
 151                                 continue;
 152
 153                         cs = OALLOC(&sr->ob, coloring_suffix_t);
 154                         cs->irn = irn;
 155                         cs->next = sr->col_suff;
 156                         sr->col_suff = cs;
 157
 158                         pset_insert_ptr(sr->all_removed, irn);
 159
 160                         redo = true;
 161                 }
 162         }
 163 }
 164
 165 void sr_reinsert(size_red_t *sr)
 166 {
 167         coloring_suffix_t *cs;
 168         ir_graph *irg        = sr->co->irg;
 169         be_ifg_t *ifg        = sr->co->cenv->ifg;
 170         unsigned  n_regs     = arch_register_class_n_regs(sr->co->cls);
 171         unsigned *possible_cols;
 172         unsigned *allocatable_cols;
 173
 174         rbitset_alloca(allocatable_cols, n_regs);
 175         be_set_allocatable_regs(irg, sr->co->cls, allocatable_cols);
 176
 177         rbitset_alloca(possible_cols, n_regs);
 178         neighbours_iter_t iter;
 179
 180         /* color the removed nodes in right order */
 181         for (cs = sr->col_suff; cs; cs = cs->next) {
 182                 unsigned free_col;
 183                 ir_node *other;
 184                 ir_node *irn = cs->irn;
 185
 186                 rbitset_copy(possible_cols, allocatable_cols, n_regs);
 187
 188                 /* get free color by inspecting all neighbors */
 189                 be_ifg_foreach_neighbour(ifg, &iter, irn, other) {
 190                         /* only inspect nodes which are in graph right now */
 191                         if (sr_is_removed(sr, other))
 192                                 continue;
 193                         rbitset_clear(possible_cols, get_irn_col(other));
 194                 }
 195
 196                 /* now all bits not set are possible colors */
 197                 free_col = (unsigned)rbitset_next(possible_cols, 0, true);
 198                 assert(!rbitset_is_empty(possible_cols, n_regs) && "No free color found. This can not be.");
 199                 set_irn_col(sr->co, irn, free_col);
 200                 pset_remove_ptr(sr->all_removed, irn); /* irn is back in graph again */
 201         }
 202 }
 203
 204 void free_size_red(size_red_t *sr)
 205 {
 206         del_pset(sr->all_removed);
 207         obstack_free(&sr->ob, NULL);
 208         free(sr);
 209 }
 210
 211 /******************************************************************************
 212     _____                      _        _____ _      _____
 213    / ____|                    (_)      |_   _| |    |  __ \
 214   | |  __  ___ _ __   ___ _ __ _  ___    | | | |    | |__) |
 215   | | |_ |/ _ \ '_ \ / _ \ '__| |/ __|   | | | |    |  ___/
 216   | |__| |  __/ | | |  __/ |  | | (__   _| |_| |____| |
 217    \_____|\___|_| |_|\___|_|  |_|\___| |_____|______|_|
 218
 219  *****************************************************************************/
 220
 221 #include <stdio.h>
 222
 223 ilp_env_t *new_ilp_env(copy_opt_t *co, ilp_callback build, ilp_callback apply, void *env)
 224 {
 225         ilp_env_t *res = XMALLOC(ilp_env_t);
 226
 227         res->co         = co;
 228         res->build      = build;
 229         res->apply      = apply;
 230         res->env        = env;
 231         res->sr         = new_size_red(co);
 232
 233         return res;
 234 }
 235
 236 lpp_sol_state_t ilp_go(ilp_env_t *ienv)
 237 {
 238         ir_graph     *irg     = ienv->co->irg;
 239         be_options_t *options = be_get_irg_options(irg);
 240
 241         sr_remove(ienv->sr);
 242
 243         ienv->build(ienv);
 244
 245         if (dump_flags & DUMP_ILP) {
 246                 char buf[128];
 247                 FILE *f;
 248
 249                 ir_snprintf(buf, sizeof(buf), "%F_%s-co.ilp", irg,
 250                             ienv->co->cenv->cls->name);
 251                 f = fopen(buf, "wt");
 252                 if (f == NULL) {
 253                         panic("Couldn't open '%s' for writing", buf);
 254                 }
 255                 lpp_dump_plain(ienv->lp, f);
 256                 fclose(f);
 257         }
 258
 259         lpp_set_time_limit(ienv->lp, time_limit);
 260         if (solve_log)
 261                 lpp_set_log(ienv->lp, stdout);
 262
 263         lpp_solve(ienv->lp, options->ilp_server, options->ilp_solver);
 264
 265         //be_stat_ev_dbl("co_ilp_objval",     ienv->lp->objval);
 266         //be_stat_ev_dbl("co_ilp_best_bound", ienv->lp->best_bound);
 267         be_stat_ev    ("co_ilp_iter",       lpp_get_iter_cnt(ienv->lp));
 268         be_stat_ev_dbl("co_ilp_sol_time",   lpp_get_sol_time(ienv->lp));
 269
 270         ienv->apply(ienv);
 271
 272         sr_reinsert(ienv->sr);
 273
 274         return lpp_get_sol_state(ienv->lp);
 275 }
 276
 277 void free_ilp_env(ilp_env_t *ienv)
 278 {
 279         free_size_red(ienv->sr);
 280         lpp_free(ienv->lp);
 281         free(ienv);
 282 }