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 "irtools.h"
  29 #include "irprintf.h"
  30
  31 #include "bestatevent.h"
  32 #include "beirg.h"
  33 #include "bemodule.h"
  34 #include "error.h"
  35
  36 #include "lpp.h"
  37
  38 #include "lc_opts.h"
  39 #include "lc_opts_enum.h"
  40
  41 #define DUMP_ILP 1
  42 #define DUMP_SOL 2
  43
  44 static int time_limit = 60;
  45 static int solve_log  = 0;
  46 static unsigned dump_flags = 0;
  47
  48 static const lc_opt_enum_mask_items_t dump_items[] = {
  49         { "ilp",   DUMP_ILP },
  50         { "sol",   DUMP_SOL },
  51         { NULL,    0 }
  52 };
  53
  54 static lc_opt_enum_mask_var_t dump_var = {
  55         &dump_flags, dump_items
  56 };
  57
  58 static const lc_opt_table_entry_t options[] = {
  59         LC_OPT_ENT_INT      ("limit", "time limit for solving in seconds (0 for unlimited)", &time_limit),
  60         LC_OPT_ENT_BOOL     ("log",   "show ilp solving log",              &solve_log),
  61         LC_OPT_ENT_ENUM_MASK("dump",  "dump flags",             &dump_var),
  62         LC_OPT_LAST
  63 };
  64
  65 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_copyilp)
  66 void be_init_copyilp(void)
  67 {
  68         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
  69         lc_opt_entry_t *ra_grp = lc_opt_get_grp(be_grp, "ra");
  70         lc_opt_entry_t *chordal_grp = lc_opt_get_grp(ra_grp, "chordal");
  71         lc_opt_entry_t *co_grp = lc_opt_get_grp(chordal_grp, "co");
  72         lc_opt_entry_t *ilp_grp = lc_opt_get_grp(co_grp, "ilp");
  73
  74         lc_opt_add_table(ilp_grp, options);
  75 }
  76
  77 #include "becopyilp_t.h"
  78 #include "beifg.h"
  79
  80 /******************************************************************************
  81     _____ _                        _            _   _
  82    / ____(_)                      | |          | | (_)
  83   | (___  _ _______   _ __ ___  __| |_   _  ___| |_ _  ___  _ __
  84    \___ \| |_  / _ \ | '__/ _ \/ _` | | | |/ __| __| |/ _ \| '_ \
  85    ____) | |/ /  __/ | | |  __/ (_| | |_| | (__| |_| | (_) | | | |
  86   |_____/|_/___\___| |_|  \___|\__,_|\__,_|\___|\__|_|\___/|_| |_|
  87
  88  *****************************************************************************/
  89
  90
  91 size_red_t *new_size_red(copy_opt_t *co)
  92 {
  93         size_red_t *res = XMALLOC(size_red_t);
  94
  95         res->co = co;
  96         res->all_removed = pset_new_ptr_default();
  97         res->col_suff = NULL;
  98         obstack_init(&res->ob);
  99
 100         return res;
 101 }
 102
 103 /**
 104  * Checks if a node is simplicial in the graph heeding the already removed nodes.
 105  */
 106 static inline int sr_is_simplicial(size_red_t *sr, const ir_node *ifn)
 107 {
 108         be_ifg_t *ifg  = sr->co->cenv->ifg;
 109         neighbours_iter_t iter;
 110         ir_node **all  = ALLOCAN(ir_node*, be_ifg_degree(ifg, ifn));
 111         ir_node  *curr;
 112         int       size = 0;
 113         int       i;
 114         int       o;
 115
 116         /* get all non-removed neighbors */
 117         be_ifg_foreach_neighbour(ifg, &iter, ifn, curr)
 118                 if (!sr_is_removed(sr, curr))
 119                         all[size++] = curr;
 120
 121         /* check if these form a clique */
 122         for (i=0; i<size; ++i)
 123                 for (o=i+1; o<size; ++o)
 124                         if (!be_ifg_connected(ifg, all[i], all[o]))
 125                                 return 0;
 126
 127         /* all edges exist so this is a clique */
 128         return 1;
 129 }
 130
 131 void sr_remove(size_red_t *sr)
 132 {
 133         ir_node *irn;
 134         int redo = 1;
 135         const be_ifg_t *ifg = sr->co->cenv->ifg;
 136         nodes_iter_t iter;
 137
 138         while (redo) {
 139                 redo = 0;
 140                 be_ifg_foreach_node(ifg, &iter, irn) {
 141                         const arch_register_req_t *req = arch_get_irn_register_req(irn);
 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 = OALLOC(&sr->ob, coloring_suffix_t);
 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 {
 162         coloring_suffix_t *cs;
 163         be_ifg_t *ifg        = sr->co->cenv->ifg;
 164         bitset_t *used_cols  = bitset_alloca(arch_register_class_n_regs(sr->co->cls));
 165         neighbours_iter_t iter;
 166
 167         /* color the removed nodes in right order */
 168         for (cs = sr->col_suff; cs; cs = cs->next) {
 169                 int free_col;
 170                 ir_node *other, *irn;
 171
 172                 /* get free color by inspecting all neighbors */
 173                 irn = cs->irn;
 174                 bitset_clear_all(used_cols);
 175
 176                 be_ifg_foreach_neighbour(ifg, &iter, irn, other) {
 177                         if (!sr_is_removed(sr, other)) /* only inspect nodes which are in graph right now */
 178                                 bitset_set(used_cols, get_irn_col(other));
 179                 }
 180
 181                 /* now all bits not set are possible colors */
 182                 free_col = bitset_next_clear(used_cols, 0);
 183                 assert(free_col != -1 && "No free color found. This can not be.");
 184                 set_irn_col(sr->co, irn, free_col);
 185                 pset_remove_ptr(sr->all_removed, irn); /* irn is back in graph again */
 186         }
 187 }
 188
 189 void free_size_red(size_red_t *sr)
 190 {
 191         del_pset(sr->all_removed);
 192         obstack_free(&sr->ob, NULL);
 193         free(sr);
 194 }
 195
 196 /******************************************************************************
 197     _____                      _        _____ _      _____
 198    / ____|                    (_)      |_   _| |    |  __ \
 199   | |  __  ___ _ __   ___ _ __ _  ___    | | | |    | |__) |
 200   | | |_ |/ _ \ '_ \ / _ \ '__| |/ __|   | | | |    |  ___/
 201   | |__| |  __/ | | |  __/ |  | | (__   _| |_| |____| |
 202    \_____|\___|_| |_|\___|_|  |_|\___| |_____|______|_|
 203
 204  *****************************************************************************/
 205
 206 #include <stdio.h>
 207
 208 ilp_env_t *new_ilp_env(copy_opt_t *co, ilp_callback build, ilp_callback apply, void *env)
 209 {
 210         ilp_env_t *res = XMALLOC(ilp_env_t);
 211
 212         res->co         = co;
 213         res->build      = build;
 214         res->apply      = apply;
 215         res->env        = env;
 216         res->sr         = new_size_red(co);
 217
 218         return res;
 219 }
 220
 221 lpp_sol_state_t ilp_go(ilp_env_t *ienv)
 222 {
 223         be_options_t *options = be_get_irg_options(ienv->co->irg);
 224
 225         sr_remove(ienv->sr);
 226
 227         ienv->build(ienv);
 228         lpp_set_time_limit(ienv->lp, time_limit);
 229
 230         if (solve_log)
 231                 lpp_set_log(ienv->lp, stdout);
 232
 233         lpp_solve(ienv->lp, options->ilp_server, options->ilp_solver);
 234
 235         //be_stat_ev_dbl("co_ilp_objval",     ienv->lp->objval);
 236         //be_stat_ev_dbl("co_ilp_best_bound", ienv->lp->best_bound);
 237         be_stat_ev    ("co_ilp_iter",       lpp_get_iter_cnt(ienv->lp));
 238         be_stat_ev_dbl("co_ilp_sol_time",   lpp_get_sol_time(ienv->lp));
 239
 240         if (dump_flags & DUMP_ILP) {
 241                 char buf[128];
 242                 FILE *f;
 243
 244                 ir_snprintf(buf, sizeof(buf), "%F_%s-co.ilp", ienv->co->cenv->irg,
 245                             ienv->co->cenv->cls->name);
 246                 f = fopen(buf, "wt");
 247                 if (f == NULL) {
 248                         panic("Couldn't open '%s' for writing", buf);
 249                 }
 250                 lpp_dump_plain(ienv->lp, f);
 251                 fclose(f);
 252         }
 253
 254         ienv->apply(ienv);
 255
 256         sr_reinsert(ienv->sr);
 257
 258         return lpp_get_sol_state(ienv->lp);
 259 }
 260
 261 void free_ilp_env(ilp_env_t *ienv)
 262 {
 263         free_size_red(ienv->sr);
 264         lpp_free(ienv->lp);
 265         free(ienv);
 266 }