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  * @version     $Id$
  26  */
  27 #include "config.h"
  28
  29 #include "irtools.h"
  30 #include "irprintf.h"
  31
  32 #include "bestatevent.h"
  33 #include "beirg_t.h"
  34 #include "bemodule.h"
  35 #include "error.h"
  36
  37 #include "lc_opts.h"
  38 #include "lc_opts_enum.h"
  39
  40 #ifdef WITH_ILP
  41
  42 #define DUMP_ILP 1
  43 #define DUMP_SOL 2
  44
  45 static int time_limit = 60;
  46 static int solve_net  = 1;
  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     ("net",   "solve over the net", &solve_net),
  63         LC_OPT_ENT_BOOL     ("log",   "show ilp solving log",              &solve_log),
  64         LC_OPT_ENT_ENUM_MASK("dump",  "dump flags",             &dump_var),
  65         LC_OPT_LAST
  66 };
  67
  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 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_copyilp);
  80
  81 #include "becopyilp_t.h"
  82 #include "beifg_t.h"
  83
  84 /******************************************************************************
  85     _____ _                        _            _   _
  86    / ____(_)                      | |          | | (_)
  87   | (___  _ _______   _ __ ___  __| |_   _  ___| |_ _  ___  _ __
  88    \___ \| |_  / _ \ | '__/ _ \/ _` | | | |/ __| __| |/ _ \| '_ \
  89    ____) | |/ /  __/ | | |  __/ (_| | |_| | (__| |_| | (_) | | | |
  90   |_____/|_/___\___| |_|  \___|\__,_|\__,_|\___|\__|_|\___/|_| |_|
  91
  92  *****************************************************************************/
  93
  94
  95 size_red_t *new_size_red(copy_opt_t *co) {
  96         size_red_t *res = XMALLOC(size_red_t);
  97
  98         res->co = co;
  99         res->all_removed = pset_new_ptr_default();
 100         res->col_suff = NULL;
 101         obstack_init(&res->ob);
 102
 103         return res;
 104 }
 105
 106 /**
 107  * Checks if a node is simplicial in the graph heeding the already removed nodes.
 108  */
 109 static inline int sr_is_simplicial(size_red_t *sr, const ir_node *ifn) {
 110         int i, o, size = 0;
 111         ir_node **all, *curr;
 112         be_ifg_t *ifg = sr->co->cenv->ifg;
 113         void *iter = be_ifg_neighbours_iter_alloca(ifg);
 114
 115         all = alloca(be_ifg_degree(ifg, ifn) * sizeof(*all));
 116
 117         /* get all non-removed neighbors */
 118         be_ifg_foreach_neighbour(ifg, iter, ifn, curr)
 119                 if (!sr_is_removed(sr, curr))
 120                         all[size++] = curr;
 121
 122         /* check if these form a clique */
 123         for (i=0; i<size; ++i)
 124                 for (o=i+1; o<size; ++o)
 125                         if (!be_ifg_connected(ifg, all[i], all[o]))
 126                                 return 0;
 127
 128         /* all edges exist so this is a clique */
 129         return 1;
 130 }
 131
 132 void sr_remove(size_red_t *sr) {
 133         ir_node *irn;
 134         int redo = 1;
 135         const be_ifg_t *ifg = sr->co->cenv->ifg;
 136         void *iter = be_ifg_nodes_iter_alloca(ifg);
 137
 138         while (redo) {
 139                 redo = 0;
 140                 be_ifg_foreach_node(ifg, iter, irn) {
 141                         const arch_register_req_t *req = arch_get_register_req(irn, -1);
 142
 143                         if (!arch_register_req_is(req, limited) && !sr_is_removed(sr, irn) && !co_gs_is_optimizable(sr->co, irn)) {
 144                                 if (sr_is_simplicial(sr, irn)) {
 145                                         coloring_suffix_t *cs = obstack_alloc(&sr->ob, sizeof(*cs));
 146
 147                                         cs->irn = irn;
 148                                         cs->next = sr->col_suff;
 149                                         sr->col_suff = cs;
 150
 151                                         pset_insert_ptr(sr->all_removed, irn);
 152
 153                                         redo = 1;
 154                                 }
 155                         }
 156                 }
 157         }
 158 }
 159
 160 void sr_reinsert(size_red_t *sr) {
 161         coloring_suffix_t *cs;
 162         be_ifg_t *ifg        = sr->co->cenv->ifg;
 163         bitset_t *used_cols  = bitset_alloca(arch_register_class_n_regs(sr->co->cls));
 164         void *iter           = be_ifg_neighbours_iter_alloca(ifg);
 165
 166         /* color the removed nodes in right order */
 167         for (cs = sr->col_suff; cs; cs = cs->next) {
 168                 int free_col;
 169                 ir_node *other, *irn;
 170
 171                 /* get free color by inspecting all neighbors */
 172                 irn = cs->irn;
 173                 bitset_clear_all(used_cols);
 174
 175                 be_ifg_foreach_neighbour(ifg, iter, irn, other) {
 176                         if (!sr_is_removed(sr, other)) /* only inspect nodes which are in graph right now */
 177                                 bitset_set(used_cols, get_irn_col(other));
 178                 }
 179
 180                 /* now all bits not set are possible colors */
 181                 free_col = bitset_next_clear(used_cols, 0);
 182                 assert(free_col != -1 && "No free color found. This can not be.");
 183                 set_irn_col(sr->co, irn, free_col);
 184                 pset_remove_ptr(sr->all_removed, irn); /* irn is back in graph again */
 185         }
 186 }
 187
 188 void free_size_red(size_red_t *sr) {
 189         del_pset(sr->all_removed);
 190         obstack_free(&sr->ob, NULL);
 191         free(sr);
 192 }
 193
 194 /******************************************************************************
 195     _____                      _        _____ _      _____
 196    / ____|                    (_)      |_   _| |    |  __ \
 197   | |  __  ___ _ __   ___ _ __ _  ___    | | | |    | |__) |
 198   | | |_ |/ _ \ '_ \ / _ \ '__| |/ __|   | | | |    |  ___/
 199   | |__| |  __/ | | |  __/ |  | | (__   _| |_| |____| |
 200    \_____|\___|_| |_|\___|_|  |_|\___| |_____|______|_|
 201
 202  *****************************************************************************/
 203
 204 #include <stdio.h>
 205
 206 ilp_env_t *new_ilp_env(copy_opt_t *co, ilp_callback build, ilp_callback apply, void *env) {
 207         ilp_env_t *res = XMALLOC(ilp_env_t);
 208
 209         res->co         = co;
 210         res->build      = build;
 211         res->apply      = apply;
 212         res->env        = env;
 213         res->sr         = new_size_red(co);
 214
 215         return res;
 216 }
 217
 218 lpp_sol_state_t ilp_go(ilp_env_t *ienv) {
 219         be_main_env_t *main_env = ienv->co->cenv->birg->main_env;
 220
 221         sr_remove(ienv->sr);
 222
 223         ienv->build(ienv);
 224         lpp_set_time_limit(ienv->lp, time_limit);
 225
 226         if(solve_log)
 227                 lpp_set_log(ienv->lp, stdout);
 228
 229         if(solve_net)
 230                 lpp_solve_net(ienv->lp, main_env->options->ilp_server, main_env->options->ilp_solver);
 231         else {
 232 #ifdef LPP_SOLVE_NET
 233                 fprintf(stderr, "can only solve ilp over the net\n");
 234 #else
 235                 lpp_solve_cplex(ienv->lp);
 236 #endif
 237         }
 238
 239         be_stat_ev_dbl("co_ilp_objval",     ienv->lp->objval);
 240         be_stat_ev_dbl("co_ilp_best_bound", ienv->lp->best_bound);
 241         be_stat_ev    ("co_ilp_iter",       ienv->lp->iterations);
 242         be_stat_ev_dbl("co_ilp_sol_time",   ienv->lp->sol_time);
 243
 244         if(dump_flags & DUMP_ILP) {
 245                 char buf[128];
 246                 FILE *f;
 247
 248                 ir_snprintf(buf, sizeof(buf), "%F_%s-co.ilp", ienv->co->cenv->irg,
 249                             ienv->co->cenv->cls->name);
 250                 f = fopen(buf, "wt");
 251                 if(f == NULL) {
 252                         panic("Couldn't open '%s' for writing", buf);
 253                 }
 254                 lpp_dump_plain(ienv->lp, f);
 255                 fclose(f);
 256         }
 257
 258         ienv->apply(ienv);
 259
 260         sr_reinsert(ienv->sr);
 261
 262         return lpp_get_sol_state(ienv->lp);
 263 }
 264
 265 void free_ilp_env(ilp_env_t *ienv) {
 266         free_size_red(ienv->sr);
 267         free_lpp(ienv->lp);
 268         free(ienv);
 269 }
 270
 271 #else /* WITH_ILP */
 272
 273 static inline void only_that_you_can_compile_without_WITH_ILP_defined(void) {
 274 }
 275
 276 #endif /* WITH_ILP */