nsz Git - libfirm/blob - ir/be/bepbqpcoloring.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       PBQP based register allocation.
  23  * @author      Thomas Bersch
  24  * @date        27.11.2009
  25  * @version     $Id: bechordal.c 26750 2009-11-27 09:37:43Z bersch $
  26  */
  27
  28 /*      miscellaneous includes */
  29 #include "config.h"
  30
  31 #ifdef FIRM_KAPS
  32
  33 #include "debug.h"
  34 #include "error.h"
  35
  36 #include "irdom.h"
  37 #include "iredges_t.h"
  38 #include "irprintf.h"
  39 #include "irgwalk.h"
  40 #include "time.h"
  41
  42 /* libfirm/ir/be includes */
  43 #include "bearch.h"
  44 #include "beirg.h"
  45 #include "besched.h"
  46 #include "bemodule.h"
  47 #include "bechordal_common.h"
  48 #include "bechordal.h"
  49 #include "bechordal_t.h"
  50 #include "beinsn_t.h"
  51 #include "benode.h"
  52 #include "belive.h"
  53 #include "belive_t.h"
  54 #include "beutil.h"
  55 #include "plist.h"
  56 #include "pqueue.h"
  57 #include "becopyopt.h"
  58
  59 /* pbqp includes */
  60 #include "kaps.h"
  61 #include "matrix.h"
  62 #include "vector.h"
  63 #include "vector_t.h"
  64 #include "heuristical.h"
  65 #include "pbqp_t.h"
  66 #include "html_dumper.h"
  67 #include "pbqp_node_t.h"
  68 #include "pbqp_node.h"
  69
  70 #define TIMER 0
  71
  72
  73 static bool use_exec_freq = true;
  74
  75 typedef struct _be_pbqp_alloc_env_t {
  76         pbqp                                            *pbqp_inst;                     /**< PBQP instance for register allocation */
  77         be_irg_t                        *birg;                  /**< Back-end IRG session. */
  78         ir_graph                        *irg;                   /**< The graph under examination. */
  79         const arch_register_class_t *cls;                               /**< Current processed register class */
  80         be_lv_t                     *lv;
  81         bitset_t                    *ignored_regs;
  82         pbqp_matrix                                     *ife_matrix_template;
  83         pbqp_matrix                                     *aff_matrix_template;
  84         plist_t                                         *rpeo;
  85         unsigned                                        *restr_nodes;
  86         unsigned                                        *ife_edge_num;
  87         be_chordal_env_t                        *env;
  88 } be_pbqp_alloc_env_t;
  89
  90
  91 #define is_Reg_Phi(irn)                                                                                 (is_Phi(irn) && mode_is_data(get_irn_mode(irn)))
  92 #define get_Perm_src(irn)                                                                               (get_irn_n(get_Proj_pred(irn), get_Proj_proj(irn)))
  93 #define is_Perm_Proj(irn)                                                                               (is_Proj(irn) && be_is_Perm(get_Proj_pred(irn)))
  94 #define insert_edge(pbqp, src_node, trg_node, template_matrix)  (add_edge_costs(pbqp, get_irn_idx(src_node), get_irn_idx(trg_node), pbqp_matrix_copy(pbqp, template_matrix)))
  95 #define get_free_regs(restr_nodes, cls, irn)                                    (arch_register_class_n_regs(cls) - restr_nodes[get_irn_idx(irn)])
  96
  97 static inline int is_2addr_code(const arch_register_req_t *req)
  98 {
  99         return (req->type & arch_register_req_type_should_be_same) != 0;
 100 }
 101
 102 static const lc_opt_table_entry_t options[] = {
 103         LC_OPT_ENT_BOOL      ("exec_freq", "use exec_freq",  &use_exec_freq),
 104         LC_OPT_LAST
 105 };
 106
 107 #if KAPS_DUMP
 108 static FILE *my_open(const be_chordal_env_t *env, const char *prefix, const char *suffix)
 109 {
 110         FILE *result;
 111         char buf[1024];
 112         size_t i, n;
 113         char *tu_name;
 114
 115         n = strlen(env->birg->main_env->cup_name);
 116         tu_name = XMALLOCN(char, n + 1);
 117         strcpy(tu_name, env->birg->main_env->cup_name);
 118         for (i = 0; i < n; ++i)
 119                 if (tu_name[i] == '.')
 120                         tu_name[i] = '_';
 121
 122         ir_snprintf(buf, sizeof(buf), "%s%s_%F_%s%s", prefix, tu_name, env->irg, env->cls->name, suffix);
 123         xfree(tu_name);
 124         result = fopen(buf, "wt");
 125         if(result == NULL) {
 126                 panic("Couldn't open '%s' for writing.", buf);
 127         }
 128
 129         return result;
 130 }
 131 #endif
 132
 133
 134 static void create_pbqp_node(be_pbqp_alloc_env_t *pbqp_alloc_env, ir_node *irn) {
 135         const arch_register_class_t *cls = pbqp_alloc_env->cls;
 136         pbqp     *pbqp_inst              = pbqp_alloc_env->pbqp_inst;
 137         bitset_t *ignored_regs           = pbqp_alloc_env->ignored_regs;
 138         unsigned  colors_n               = arch_register_class_n_regs(cls);
 139         unsigned  cntConstrains          = 0;
 140
 141         /* create costs vector depending on register constrains */
 142         struct vector *costs_vector = vector_alloc(pbqp_inst, colors_n);
 143
 144         /* set costs depending on register constrains */
 145         unsigned idx;
 146         for(idx = 0; idx < colors_n; idx++) {
 147                 if(bitset_is_set(ignored_regs, idx) || !arch_reg_out_is_allocatable(irn, arch_register_for_index(cls, idx))) {
 148                         vector_set(costs_vector, idx, INF_COSTS);
 149                         cntConstrains++;
 150                 }
 151         }
 152
 153         /* add vector to pbqp node */
 154         add_node_costs(pbqp_inst, get_irn_idx(irn), costs_vector);
 155         pbqp_alloc_env->restr_nodes[get_irn_idx(irn)] = cntConstrains;
 156 }
 157
 158 static void insert_ife_edge(be_pbqp_alloc_env_t *pbqp_alloc_env, ir_node *src_node, ir_node *trg_node)
 159 {
 160         pbqp                                            *pbqp                = pbqp_alloc_env->pbqp_inst;
 161         const arch_register_class_t *cls                 = pbqp_alloc_env->cls;
 162         pbqp_matrix                             *ife_matrix_template = pbqp_alloc_env->ife_matrix_template;
 163         unsigned                                        *restr_nodes         = pbqp_alloc_env->restr_nodes;
 164
 165         if(get_edge(pbqp, get_irn_idx(src_node), get_irn_idx(trg_node)) == NULL) {
 166
 167                 /* increase ife edge counter */
 168                 pbqp_alloc_env->ife_edge_num[get_irn_idx(src_node)]++;
 169                 pbqp_alloc_env->ife_edge_num[get_irn_idx(trg_node)]++;
 170
 171                 /* do useful optimization to speed up pbqp solving (we can do this because we know our matrix) */
 172                 if(get_free_regs(restr_nodes, cls, src_node) == 1 && get_free_regs(restr_nodes, cls, trg_node) == 1) {
 173                         unsigned src_idx = vector_get_min_index(get_node(pbqp, get_irn_idx(src_node))->costs);
 174                         unsigned trg_idx = vector_get_min_index(get_node(pbqp, get_irn_idx(trg_node))->costs);
 175                         assert(src_idx != trg_idx && "Interfering nodes could not have the same register!");
 176                         return;
 177                 }
 178                 if(get_free_regs(restr_nodes, cls, src_node) == 1 || get_free_regs(restr_nodes, cls, trg_node) == 1) {
 179                         if(get_free_regs(restr_nodes, cls, src_node) == 1) {
 180                                 unsigned idx = vector_get_min_index(get_node(pbqp, get_irn_idx(src_node))->costs);
 181                                 vector_set(get_node(pbqp, get_irn_idx(trg_node))->costs, idx, INF_COSTS);
 182                         }
 183                         else {
 184                                 unsigned idx = vector_get_min_index(get_node(pbqp, get_irn_idx(trg_node))->costs);
 185                                 vector_set(get_node(pbqp, get_irn_idx(src_node))->costs, idx, INF_COSTS);
 186                         }
 187                         return;
 188                 }
 189
 190                 /* insert interference edge */
 191                 insert_edge(pbqp, src_node, trg_node, ife_matrix_template);
 192         }
 193 }
 194
 195 static void inser_afe_edge(be_pbqp_alloc_env_t *pbqp_alloc_env, ir_node *src_node, ir_node *trg_node, int pos)
 196 {
 197         pbqp                                            *pbqp             = pbqp_alloc_env->pbqp_inst;
 198         const arch_register_class_t *cls              = pbqp_alloc_env->cls;
 199         unsigned                                        *restr_nodes      = pbqp_alloc_env->restr_nodes;
 200         pbqp_matrix                                     *afe_matrix       = pbqp_matrix_alloc(pbqp, arch_register_class_n_regs(cls), arch_register_class_n_regs(cls));
 201         unsigned                                         colors_n                 = arch_register_class_n_regs(cls);
 202
 203         if(get_edge(pbqp, get_irn_idx(src_node), get_irn_idx(trg_node)) == NULL) {
 204                 if(use_exec_freq) {
 205                         /* get exec_freq for copy_block */
 206                         ir_node *root_bl = get_nodes_block(src_node);
 207                         ir_node *copy_bl = is_Phi(src_node) ? get_Block_cfgpred_block(root_bl, pos) : root_bl;
 208                         unsigned long res = get_block_execfreq_ulong(pbqp_alloc_env->birg->exec_freq, copy_bl);
 209
 210                         /* create afe-matrix */
 211                         unsigned row, col;
 212                         for(row = 0; row < colors_n; row++) {
 213                                 for(col = 0; col < colors_n; col++) {
 214                                         if(row != col)
 215                                                 pbqp_matrix_set(afe_matrix, row, col, (num)res);
 216                                 }
 217                         }
 218                 }
 219                 else {
 220                         afe_matrix = pbqp_alloc_env->aff_matrix_template;
 221                 }
 222
 223                 /* do useful optimization to speed up pbqp solving */
 224                 if(get_free_regs(restr_nodes, cls, src_node) == 1 && get_free_regs(restr_nodes, cls, trg_node) == 1) {
 225                         return;
 226                 }
 227                 if(get_free_regs(restr_nodes, cls, src_node) == 1 || get_free_regs(restr_nodes, cls, trg_node) == 1) {
 228                         if(get_free_regs(restr_nodes, cls, src_node) == 1) {
 229                                 unsigned regIdx = vector_get_min_index(get_node(pbqp, get_irn_idx(src_node))->costs);
 230                                 vector_add_matrix_col(get_node(pbqp, get_irn_idx(trg_node))->costs, afe_matrix, regIdx);
 231                         }
 232                         else {
 233                                 unsigned regIdx = vector_get_min_index(get_node(pbqp, get_irn_idx(trg_node))->costs);
 234                                 vector_add_matrix_col(get_node(pbqp, get_irn_idx(src_node))->costs, afe_matrix, regIdx);
 235                         }
 236                         return;
 237                 }
 238
 239                 /* insert interference edge */
 240                 insert_edge(pbqp, src_node, trg_node, afe_matrix);
 241         }
 242 }
 243
 244 static void create_affinity_edges(ir_node *irn, void *env)
 245 {
 246         be_pbqp_alloc_env_t         *pbqp_alloc_env   = env;
 247         const arch_register_class_t *cls              = pbqp_alloc_env->cls;
 248         const arch_register_req_t   *req              = arch_get_register_req_out(irn);
 249         unsigned pos, max;
 250
 251         if (is_Reg_Phi(irn)) { /* Phis */
 252                 for (pos=0, max=get_irn_arity(irn); pos<max; ++pos) {
 253                         ir_node *arg = get_irn_n(irn, pos);
 254
 255                         if (!arch_irn_consider_in_reg_alloc(cls, arg))
 256                                 continue;
 257
 258                         /* no edges to itself */
 259                         if(irn == arg) {
 260                                 continue;
 261                         }
 262
 263                         inser_afe_edge(pbqp_alloc_env, irn, arg, pos);
 264                 }
 265         }
 266         else if (is_Perm_Proj(irn)) { /* Perms */
 267                 ir_node *arg = get_Perm_src(irn);
 268                 if (!arch_irn_consider_in_reg_alloc(cls, arg))
 269                         return;
 270
 271                 inser_afe_edge(pbqp_alloc_env, irn, arg, -1);
 272         }
 273         else { /* 2-address code */
 274                 if (is_2addr_code(req)) {
 275                         const unsigned other = req->other_same;
 276                         int i;
 277
 278                         for (i = 0; 1U << i <= other; ++i) {
 279                                 if (other & (1U << i)) {
 280                                         ir_node *other = get_irn_n(skip_Proj(irn), i);
 281                                         if (!arch_irn_consider_in_reg_alloc(cls, other))
 282                                                 continue;
 283
 284                                         /* no edges to itself */
 285                                         if(irn == other) {
 286                                                 continue;
 287                                         }
 288
 289                                         inser_afe_edge(pbqp_alloc_env, irn, other, i);
 290                                 }
 291                         }
 292                 }
 293         }
 294 }
 295
 296 static void create_pbqp_coloring_instance(ir_node *block, void *data)
 297 {
 298         be_pbqp_alloc_env_t         *pbqp_alloc_env     = data;
 299         be_lv_t                     *lv                 = pbqp_alloc_env->lv;
 300         const arch_register_class_t *cls                = pbqp_alloc_env->cls;
 301         plist_t                                         *rpeo                           = pbqp_alloc_env->rpeo;
 302         pbqp                                            *pbqp_inst                      = pbqp_alloc_env->pbqp_inst;
 303         unsigned                                        *restr_nodes            = pbqp_alloc_env->restr_nodes;
 304         pqueue_t                                        *queue                  = new_pqueue();
 305         pqueue_t                                        *restr_nodes_queue      = new_pqueue();
 306         plist_t                                         *temp_list              = plist_new();
 307         ir_node                     *irn;
 308         ir_nodeset_t                 live_nodes;
 309
 310         /* first, determine the pressure */
 311         /* (this is only for compatibility with copymin optimization, it's not needed for pbqp coloring) */
 312         create_borders(block, pbqp_alloc_env->env);
 313
 314         /* calculate living nodes for the first step */
 315         ir_nodeset_init(&live_nodes);
 316         be_liveness_end_of_block(lv, cls, block, &live_nodes);
 317
 318         /* create pbqp nodes, interference edges and reverse perfect elimination order */
 319         sched_foreach_reverse(block, irn) {
 320                 ir_node *live;
 321                 ir_nodeset_iterator_t iter;
 322
 323                 if (get_irn_mode(irn) == mode_T) {
 324                         const ir_edge_t *edge;
 325                         foreach_out_edge(irn, edge) {
 326                                 ir_node *proj = get_edge_src_irn(edge);
 327                                 if (!arch_irn_consider_in_reg_alloc(cls, proj))
 328                                         continue;
 329
 330                                 /* create pbqp source node if it dosn't exist */
 331                                 if(get_node(pbqp_inst, get_irn_idx(proj)) == NULL) {
 332                                         create_pbqp_node(pbqp_alloc_env, proj);
 333                                 }
 334
 335                                 /* create nodes and interference edges */
 336                                 foreach_ir_nodeset(&live_nodes, live, iter) {
 337                                         /* create pbqp source node if it dosn't exist */
 338                                         if(get_node(pbqp_inst, get_irn_idx(live)) == NULL) {
 339                                                 create_pbqp_node(pbqp_alloc_env, live);
 340                                         }
 341
 342                                         /* no edges to itself */
 343                                         if(proj == live) {
 344                                                 continue;
 345                                         }
 346
 347                                         insert_ife_edge(pbqp_alloc_env, proj, live);
 348                                 }
 349                         }
 350                 }
 351                 else {
 352                         if (arch_irn_consider_in_reg_alloc(cls, irn)) {
 353                                 /* create pbqp source node if it dosn't exist */
 354                                 if(get_node(pbqp_inst, get_irn_idx(irn)) == NULL) {
 355                                         create_pbqp_node(pbqp_alloc_env, irn);
 356                                 }
 357
 358                                 /* create nodes and interference edges */
 359                                 foreach_ir_nodeset(&live_nodes, live, iter) {
 360                                         /* create pbqp source node if it dosn't exist */
 361                                         if(get_node(pbqp_inst, get_irn_idx(live)) == NULL) {
 362                                                 create_pbqp_node(pbqp_alloc_env, live);
 363                                         }
 364
 365                                         /* no edges to itself */
 366                                         if(irn == live) {
 367                                                 continue;
 368                                         }
 369
 370                                         /* insert interference edge */
 371                                         insert_ife_edge(pbqp_alloc_env, irn, live);
 372                                 }
 373                         }
 374                 }
 375
 376                 /* get living nodes for next step */
 377                 if (!is_Phi(irn)) {
 378                         be_liveness_transfer(cls, irn, &live_nodes);
 379                 }
 380
 381                 /* order nodes for perfect elimination order */
 382                 if (get_irn_mode(irn) == mode_T) {
 383                         plist_element_t *first = plist_first(temp_list);
 384                         const ir_edge_t *edge;
 385
 386                         foreach_out_edge(irn, edge) {
 387                                 ir_node *proj = get_edge_src_irn(edge);
 388                                 if (!arch_irn_consider_in_reg_alloc(cls, proj))
 389                                         continue;
 390
 391                                 // insert proj node into priority queue (descending by the number of interference edges)
 392                                 if(get_free_regs(restr_nodes, cls, proj) <= 4/*bitset_is_set(restr_nodes, get_irn_idx(proj))*/) {
 393                                         pqueue_put(restr_nodes_queue, proj, pbqp_alloc_env->ife_edge_num[get_irn_idx(proj)]);
 394                                 }
 395                                 else {
 396                                         pqueue_put(queue,proj, pbqp_alloc_env->ife_edge_num[get_irn_idx(proj)]);
 397                                 }
 398                         }
 399
 400                         /* first insert all restricted nodes */
 401                         while(!pqueue_empty(restr_nodes_queue)) {
 402                                 if(first == NULL) {
 403                                         plist_insert_back(temp_list, get_node(pbqp_inst, get_irn_idx(pqueue_pop_front(restr_nodes_queue))));
 404                                         first = plist_first(temp_list);
 405                                 } else {
 406                                         plist_insert_before(temp_list, first, get_node(pbqp_inst, get_irn_idx(pqueue_pop_front(restr_nodes_queue))));
 407                                 }
 408                         }
 409
 410                         /* insert proj nodes descending by their number of interference edges */
 411                         while(!pqueue_empty(queue)) {
 412                                 if(first == NULL) {
 413                                         plist_insert_back(temp_list, get_node(pbqp_inst, get_irn_idx(pqueue_pop_front(queue))));
 414                                         first = plist_first(temp_list);
 415                                 } else {
 416                                         plist_insert_before(temp_list, first, get_node(pbqp_inst, get_irn_idx(pqueue_pop_front(queue))));
 417                                 }
 418                         }
 419                 }
 420                 else {
 421                         if (arch_irn_consider_in_reg_alloc(cls, irn)) {
 422                                 plist_insert_front(temp_list, get_node(pbqp_inst, get_irn_idx(irn)));
 423                         }
 424                 }
 425         }
 426
 427         /* insert nodes into reverse perfect elimination order */
 428         plist_element_t *el;
 429         foreach_plist(temp_list, el) {
 430                 plist_insert_back(rpeo, el->data);
 431         }
 432
 433         /* free reserved memory */
 434         ir_nodeset_destroy(&live_nodes);
 435         plist_free(temp_list);
 436         del_pqueue(queue);
 437         del_pqueue(restr_nodes_queue);
 438 }
 439
 440 static void insert_perms(ir_node *block, void *data)
 441 {
 442         /*
 443          * Start silent in the start block.
 444          * The silence remains until the first barrier is seen.
 445          * Each other block is begun loud.
 446          */
 447         be_chordal_env_t *env    = data;
 448         ir_node          *irn;
 449         int               silent = block == get_irg_start_block(get_irn_irg(block));
 450
 451         /*
 452          * If the block is the start block search the barrier and
 453          * start handling constraints from there.
 454          */
 455         for (irn = sched_first(block); !sched_is_end(irn);) {
 456                 int silent_old = silent;        /* store old silent value */
 457                 if (be_is_Barrier(irn))
 458                         silent = !silent;               /* toggle silent flag */
 459
 460                 be_insn_t *insn         = chordal_scan_insn(env, irn);
 461                 irn                                     = insn->next_insn;
 462
 463                 if (silent_old)
 464                         continue;
 465
 466                 if (!insn->has_constraints)
 467                         continue;
 468
 469                 pre_process_constraints(env, &insn);
 470         }
 471 }
 472
 473 void be_pbqp_coloring(be_chordal_env_t *env)
 474 {
 475         ir_graph                      *irg  = env->irg;
 476         be_irg_t                      *birg = env->birg;
 477         const arch_register_class_t   *cls  = env->cls;
 478         unsigned colors_n                                   = arch_register_class_n_regs(cls);
 479         be_pbqp_alloc_env_t pbqp_alloc_env;
 480         unsigned idx, row, col;
 481         be_lv_t *lv;
 482
 483 #if TIMER
 484         ir_timer_t *t_ra_pbqp_alloc_create     = ir_timer_new();
 485         ir_timer_t *t_ra_pbqp_alloc_solve      = ir_timer_new();
 486         ir_timer_t *t_ra_pbqp_alloc_create_aff = ir_timer_new();
 487
 488         printf("#### ----- === Allocating registers of %s (%s) ===\n", cls->name, get_entity_name(get_irg_entity(irg)));
 489 #endif
 490         lv = be_assure_liveness(birg);
 491         be_liveness_assure_sets(lv);
 492         be_liveness_assure_chk(lv);
 493
 494         /* insert perms */
 495         assure_doms(irg);
 496         dom_tree_walk_irg(irg, insert_perms, NULL, env);
 497
 498         /* dump graph after inserting perms */
 499         if (env->opts->dump_flags & BE_CH_DUMP_CONSTR) {
 500                 char buf[256];
 501                 snprintf(buf, sizeof(buf), "-%s-constr", cls->name);
 502                 be_dump(irg, buf, dump_ir_block_graph_sched);
 503         }
 504
 505
 506         /* initialize pbqp allocation data structure */
 507         pbqp_alloc_env.pbqp_inst    = alloc_pbqp(get_irg_last_idx(irg));                /* initialize pbqp instance */
 508         pbqp_alloc_env.birg         = birg;
 509         pbqp_alloc_env.cls          = cls;
 510         pbqp_alloc_env.irg          = irg;
 511         pbqp_alloc_env.lv           = lv;
 512         pbqp_alloc_env.ignored_regs = bitset_malloc(colors_n);
 513         pbqp_alloc_env.rpeo                     = plist_new();
 514         pbqp_alloc_env.restr_nodes  = XMALLOCNZ(unsigned, get_irg_last_idx(irg));
 515         pbqp_alloc_env.ife_edge_num = XMALLOCNZ(unsigned, get_irg_last_idx(irg));
 516         pbqp_alloc_env.env                      = env;
 517         be_put_ignore_regs(birg, cls, pbqp_alloc_env.ignored_regs);                             /* get ignored registers */
 518
 519
 520         /* create costs matrix template for interference edges */
 521         struct pbqp_matrix *ife_matrix = pbqp_matrix_alloc(pbqp_alloc_env.pbqp_inst, colors_n, colors_n);
 522         /* set costs */
 523         for(row = 0, col=0; row < colors_n; row++, col++)
 524                 pbqp_matrix_set(ife_matrix, row, col, INF_COSTS);
 525
 526         pbqp_alloc_env.ife_matrix_template = ife_matrix;
 527
 528
 529         if(!use_exec_freq) {
 530                 /* create costs matrix template for affinity edges */
 531                 struct pbqp_matrix *afe_matrix = pbqp_matrix_alloc(pbqp_alloc_env.pbqp_inst, colors_n, colors_n);
 532                 /* set costs */
 533                 for(row = 0; row < colors_n; row++) {
 534                         for(col = 0; col < colors_n; col++) {
 535                                 if(row != col)
 536                                         pbqp_matrix_set(afe_matrix, row, col, 2);
 537                         }
 538                 }
 539                 pbqp_alloc_env.aff_matrix_template = afe_matrix;
 540         }
 541
 542
 543         /* create pbqp instance */
 544 #if TIMER
 545         ir_timer_reset_and_start(t_ra_pbqp_alloc_create);
 546 #endif
 547         assure_doms(irg);
 548         dom_tree_walk_irg(irg, create_pbqp_coloring_instance , NULL, &pbqp_alloc_env);
 549 #if TIMER
 550         ir_timer_stop(t_ra_pbqp_alloc_create);
 551 #endif
 552
 553
 554         /* set up affinity edges */
 555 #if TIMER
 556         ir_timer_reset_and_start(t_ra_pbqp_alloc_create_aff);
 557 #endif
 558         plist_element_t *el;
 559         foreach_plist(pbqp_alloc_env.rpeo, el) {
 560                 pbqp_node *node                    = el->data;
 561                 idx                                    = node->index;
 562                 ir_node *irn               = get_idx_irn(irg, idx);
 563                 create_affinity_edges(irn, &pbqp_alloc_env);
 564         }
 565 #if TIMER
 566         ir_timer_stop(t_ra_pbqp_alloc_create_aff);
 567 #endif
 568
 569
 570 #if KAPS_DUMP
 571         // dump graph before solving pbqp
 572         FILE *file_before = my_open(env, "", "-pbqp_coloring.html");
 573         set_dumpfile(pbqp_alloc_env.pbqp_inst, file_before);
 574 #endif
 575
 576
 577         /* solve pbqp instance */
 578 #if TIMER
 579         ir_timer_reset_and_start(t_ra_pbqp_alloc_solve);
 580 #endif
 581         solve_pbqp_heuristical_co(pbqp_alloc_env.pbqp_inst,pbqp_alloc_env.rpeo);
 582 #if TIMER
 583         ir_timer_stop(t_ra_pbqp_alloc_solve);
 584 #endif
 585         num solution = get_solution(pbqp_alloc_env.pbqp_inst);
 586         assert(solution != INF_COSTS && "No PBQP solution found");
 587
 588
 589         /* assign colors */
 590         plist_element_t *element;
 591         foreach_plist(pbqp_alloc_env.rpeo, element) {
 592                 pbqp_node *node                    = element->data;
 593                 idx                                    = node->index;
 594                 ir_node *irn               = get_idx_irn(irg, idx);
 595                 num color                  = get_node_solution(pbqp_alloc_env.pbqp_inst, idx);
 596                 const arch_register_t *reg = arch_register_for_index(cls, color);
 597
 598                 arch_set_irn_register(irn, reg);
 599         }
 600
 601
 602 #if TIMER
 603         printf("%-20s: %8.3lf msec\n", "pbqp alloc create",
 604                (double)ir_timer_elapsed_usec(t_ra_pbqp_alloc_create) / 1000.0);
 605         printf("%-20s: %8.3lf msec\n", "pbqp alloc solve",
 606                (double)ir_timer_elapsed_usec(t_ra_pbqp_alloc_solve) / 1000.0);
 607         printf("%-20s: %8.3lf msec\n", "pbqp alloc create aff",
 608                (double)ir_timer_elapsed_usec(t_ra_pbqp_alloc_create_aff) / 1000.0);
 609 #endif
 610
 611
 612         /* free reserved memory */
 613 #if KAPS_DUMP
 614         fclose(file_before);
 615 #endif
 616         bitset_free(pbqp_alloc_env.ignored_regs);
 617         free_pbqp(pbqp_alloc_env.pbqp_inst);
 618         plist_free(pbqp_alloc_env.rpeo);
 619         xfree(pbqp_alloc_env.restr_nodes);
 620         xfree(pbqp_alloc_env.ife_edge_num);
 621 }
 622
 623
 624 /**
 625  * Initializes this module.
 626  */
 627 void be_init_pbqp_coloring(void)
 628 {
 629         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
 630         lc_opt_entry_t *ra_grp = lc_opt_get_grp(be_grp, "ra");
 631         lc_opt_entry_t *chordal_grp = lc_opt_get_grp(ra_grp, "chordal");
 632         lc_opt_entry_t *coloring_grp = lc_opt_get_grp(chordal_grp, "coloring");
 633         lc_opt_entry_t *pbqp_grp = lc_opt_get_grp(coloring_grp, "pbqp");
 634
 635         static be_ra_chordal_coloring_t coloring = {
 636                 be_pbqp_coloring
 637         };
 638
 639         lc_opt_add_table(pbqp_grp, options);
 640         be_register_chordal_coloring("pbqp", &coloring);
 641 }
 642
 643 BE_REGISTER_MODULE_CONSTRUCTOR(be_pbqp_alloc);
 644
 645 #endif