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

   1 /*
   2  * Copyright (C) 1995-2007 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       Block-scheduling strategies.
  23  * @author      Matthias Braun, Christoph Mallon
  24  * @date        27.09.2006
  25  * @version     $Id$
  26  */
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "beblocksched.h"
  32
  33 #include <stdlib.h>
  34
  35 #include "array.h"
  36 #include "pdeq.h"
  37
  38 #include "iredges.h"
  39 #include "irgwalk.h"
  40 #include "irnode_t.h"
  41 #include "irgraph_t.h"
  42 #include "irloop.h"
  43 #include "irprintf.h"
  44 #include "execfreq.h"
  45 #include "irdump_t.h"
  46 #include "irtools.h"
  47 #include "debug.h"
  48 #include "beirgmod.h"
  49 #include "bemodule.h"
  50 #include "be.h"
  51
  52 #include <libcore/lc_opts.h>
  53 #include <libcore/lc_opts_enum.h>
  54 #include <libcore/lc_timing.h>
  55
  56 #ifdef WITH_ILP
  57 #include <lpp/lpp.h>
  58 #include <lpp/lpp_net.h>
  59 #endif /* WITH_ILP */
  60
  61 DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
  62
  63 typedef enum _blocksched_algos_t {
  64         BLOCKSCHED_NAIV, BLOCKSCHED_EXTBB, BLOCKSCHED_GREEDY, BLOCKSCHED_ILP
  65 } blocksched_algos_t;
  66
  67 static int algo = BLOCKSCHED_GREEDY;
  68
  69 static const lc_opt_enum_int_items_t blockschedalgo_items[] = {
  70         { "naiv",       BLOCKSCHED_NAIV },
  71         { "extbb",      BLOCKSCHED_EXTBB },
  72         { "greedy", BLOCKSCHED_GREEDY },
  73 #ifdef WITH_ILP
  74         { "ilp",    BLOCKSCHED_ILP },
  75 #endif /* WITH_ILP */
  76         { NULL,     0 }
  77 };
  78
  79 static lc_opt_enum_int_var_t algo_var = {
  80         &algo, blockschedalgo_items
  81 };
  82
  83 static const lc_opt_table_entry_t be_blocksched_options[] = {
  84         LC_OPT_ENT_ENUM_INT ("algo", "the block scheduling algorithm", &algo_var),
  85         { NULL }
  86 };
  87
  88 /*
  89  *   ____                   _
  90  *  / ___|_ __ ___  ___  __| |_   _
  91  * | |  _| '__/ _ \/ _ \/ _` | | | |
  92  * | |_| | | |  __/  __/ (_| | |_| |
  93  *  \____|_|  \___|\___|\__,_|\__, |
  94  *                            |___/
  95  */
  96
  97 typedef struct _blocksched_entry_t {
  98         ir_node *block;
  99         struct _blocksched_entry_t *next;
 100         struct _blocksched_entry_t *prev;
 101 } blocksched_entry_t;
 102
 103 typedef struct _edge_t {
 104         ir_node *block;             /**< source block */
 105         int     pos;                /**< number of cfg predecessor (target) */
 106         double  execfreq;           /**< the frequency */
 107         int     highest_execfreq;   /**< flag that indicates wether this edge is the edge with the highest
 108                                                                      execfreq pointing away from this block */
 109 } edge_t;
 110
 111 typedef struct _blocksched_env_t {
 112         ir_graph       *irg;
 113         struct obstack *obst;
 114         ir_exec_freq   *execfreqs;
 115         edge_t         *edges;
 116         pdeq           *worklist;
 117         int            blockcount;
 118 } blocksched_env_t;
 119
 120 /**
 121  * Collect cfg frequencies of all edges between blocks.
 122  * Also determines edge with highest frequency.
 123  */
 124 static void collect_egde_frequency(ir_node *block, void *data)
 125 {
 126         blocksched_env_t   *env = data;
 127         int                arity;
 128         edge_t             edge;
 129         blocksched_entry_t *entry;
 130
 131         entry        = obstack_alloc(env->obst, sizeof(entry[0]));
 132         entry->block = block;
 133         entry->next  = NULL;
 134         entry->prev  = NULL;
 135         set_irn_link(block, entry);
 136
 137         if (block == get_irg_start_block(env->irg))
 138                 return;
 139
 140         arity = get_irn_arity(block);
 141
 142         if (arity == 1) {
 143                 edge.block            = block;
 144                 edge.pos              = 0;
 145                 edge.execfreq         = get_block_execfreq(env->execfreqs, block);
 146                 edge.highest_execfreq = 1;
 147                 ARR_APP1(edge_t, env->edges, edge);
 148         } else {
 149                 int    i;
 150                 double highest_execfreq = -1.0;
 151                 int    highest_edge_num = -1;
 152
 153                 edge.block = block;
 154                 for (i = 0; i < arity; ++i) {
 155                         double  execfreq;
 156                         ir_node *pred_block = get_Block_cfgpred_block(block, i);
 157
 158                         execfreq = get_block_execfreq(env->execfreqs, pred_block);
 159
 160                         edge.pos              = i;
 161                         edge.execfreq         = execfreq;
 162                         edge.highest_execfreq = 0;
 163                         ARR_APP1(edge_t, env->edges, edge);
 164
 165                         if (execfreq > highest_execfreq) {
 166                                 highest_execfreq = execfreq;
 167                                 highest_edge_num = ARR_LEN(env->edges) - 1;
 168                         }
 169                 }
 170
 171                 if(highest_edge_num >= 0)
 172                         env->edges[highest_edge_num].highest_execfreq = 1;
 173         }
 174 }
 175
 176 static int cmp_edges(const void *d1, const void *d2)
 177 {
 178         const edge_t *e1 = d1;
 179         const edge_t *e2 = d2;
 180
 181         return QSORT_CMP(e2->execfreq, e1->execfreq);
 182 }
 183
 184 static void coalesce_blocks(blocksched_env_t *env)
 185 {
 186         int i;
 187         int edge_count = ARR_LEN(env->edges);
 188
 189         /* run1: only look at jumps */
 190         for (i = 0; i < edge_count; ++i) {
 191                 const edge_t *edge  = &env->edges[i];
 192                 ir_node      *block = edge->block;
 193                 ir_node      *pred_block;
 194                 blocksched_entry_t *entry, *pred_entry;
 195
 196                 /* the block might have been removed already... */
 197                 if (is_Bad(get_Block_cfgpred(block, 0)))
 198                         continue;
 199
 200                 /* only check edge with highest frequency */
 201                 if (! edge->highest_execfreq)
 202                         continue;
 203
 204                 pred_block = get_Block_cfgpred_block(block, edge->pos);
 205                 entry      = get_irn_link(block);
 206                 pred_entry = get_irn_link(pred_block);
 207
 208                 if (pred_entry->next != NULL || entry->prev != NULL)
 209                         continue;
 210
 211                 /* only coalesce jumps */
 212                 if (get_block_succ_next(pred_block, get_block_succ_first(pred_block)) != NULL)
 213                         continue;
 214
 215                 /* schedule the 2 blocks behind each other */
 216                 DBG((dbg, LEVEL_1, "Coalesce (Jump) %+F -> %+F (%.3g)\n",
 217                            pred_entry->block, entry->block, edge->execfreq));
 218                 pred_entry->next = entry;
 219                 entry->prev      = pred_entry;
 220         }
 221
 222         /* run2: remaining edges */
 223         for (i = 0; i < edge_count; ++i) {
 224                 const edge_t *edge  = &env->edges[i];
 225                 ir_node      *block = edge->block;
 226                 ir_node      *pred_block;
 227                 blocksched_entry_t *entry, *pred_entry;
 228
 229                 /* the block might have been removed already... */
 230                 if (is_Bad(get_Block_cfgpred(block, 0)))
 231                         continue;
 232
 233                 pred_block = get_Block_cfgpred_block(block, edge->pos);
 234                 entry      = get_irn_link(block);
 235                 pred_entry = get_irn_link(pred_block);
 236
 237                 /* is 1 of the blocks already attached to another block? */
 238                 if (pred_entry->next != NULL || entry->prev != NULL)
 239                         continue;
 240
 241                 /* schedule the 2 blocks behind each other */
 242                 DBG((dbg, LEVEL_1, "Coalesce (CondJump) %+F -> %+F (%.3g)\n",
 243                            pred_entry->block, entry->block, edge->execfreq));
 244                 pred_entry->next = entry;
 245                 entry->prev      = pred_entry;
 246         }
 247 }
 248
 249 static void pick_block_successor(blocksched_entry_t *entry, blocksched_env_t *env)
 250 {
 251         ir_node            *block = entry->block;
 252         ir_node            *succ  = NULL;
 253         blocksched_entry_t *succ_entry;
 254         const ir_edge_t    *edge;
 255         double             best_succ_execfreq;
 256
 257         if (irn_visited(block))
 258                 return;
 259
 260         env->blockcount++;
 261         mark_irn_visited(block);
 262
 263         DBG((dbg, LEVEL_1, "Pick succ of %+F\n", block));
 264
 265         /* put all successors into the worklist */
 266         foreach_block_succ(block, edge) {
 267                 ir_node *succ_block = get_edge_src_irn(edge);
 268
 269                 if (irn_visited(succ_block))
 270                         continue;
 271
 272                 /* we only need to put the first of a series of already connected
 273                  * blocks into the worklist */
 274                 succ_entry = get_irn_link(succ_block);
 275                 while (succ_entry->prev != NULL) {
 276                         /* break cycles... */
 277                         if (succ_entry->prev->block == succ_block) {
 278                                 succ_entry->prev->next = NULL;
 279                                 succ_entry->prev       = NULL;
 280                                 break;
 281                         }
 282                         succ_entry = succ_entry->prev;
 283                 };
 284
 285                 if (irn_visited(succ_entry->block))
 286                         continue;
 287
 288                 DBG((dbg, LEVEL_1, "Put %+F into worklist\n", succ_entry->block));
 289                 pdeq_putr(env->worklist, succ_entry->block);
 290         }
 291
 292         if (entry->next != NULL) {
 293                 pick_block_successor(entry->next, env);
 294                 return;
 295         }
 296
 297         DBG((dbg, LEVEL_1, "deciding...\n"));
 298         best_succ_execfreq = -1;
 299
 300         /* no successor yet: pick the successor block with the highest execution
 301          * frequency which has no predecessor yet */
 302
 303         foreach_block_succ(block, edge) {
 304                 ir_node *succ_block = get_edge_src_irn(edge);
 305                 double  execfreq;
 306
 307                 if (irn_visited(succ_block))
 308                         continue;
 309
 310                 succ_entry = get_irn_link(succ_block);
 311                 if (succ_entry->prev != NULL)
 312                         continue;
 313
 314                 execfreq = get_block_execfreq(env->execfreqs, succ_block);
 315                 if (execfreq > best_succ_execfreq) {
 316                         best_succ_execfreq = execfreq;
 317                         succ = succ_block;
 318                 }
 319         }
 320
 321         if (succ == NULL) {
 322                 DBG((dbg, LEVEL_1, "pick from worklist\n"));
 323
 324                 do {
 325                         if (pdeq_empty(env->worklist)) {
 326                                 DBG((dbg, LEVEL_1, "worklist empty\n"));
 327                                 return;
 328                         }
 329                         succ = pdeq_getl(env->worklist);
 330                 } while (irn_visited(succ));
 331         }
 332
 333         succ_entry       = get_irn_link(succ);
 334         entry->next      = succ_entry;
 335         succ_entry->prev = entry;
 336
 337         pick_block_successor(succ_entry, env);
 338 }
 339
 340 static blocksched_entry_t *finish_block_schedule(blocksched_env_t *env)
 341 {
 342         ir_graph           *irg        = env->irg;
 343         ir_node            *startblock = get_irg_start_block(irg);
 344         blocksched_entry_t *entry      = get_irn_link(startblock);
 345
 346         set_using_visited(irg);
 347         inc_irg_visited(irg);
 348
 349         env->worklist = new_pdeq();
 350         pick_block_successor(entry, env);
 351         assert(pdeq_empty(env->worklist));
 352         del_pdeq(env->worklist);
 353
 354         clear_using_visited(irg);
 355
 356         return entry;
 357 }
 358
 359 static ir_node **create_blocksched_array(blocksched_env_t *env, blocksched_entry_t *first,
 360                                                                                 int count, struct obstack* obst)
 361 {
 362         int                i = 0;
 363         ir_node            **block_list;
 364         blocksched_entry_t *entry;
 365
 366         block_list = NEW_ARR_D(ir_node *, obst, count);
 367         DBG((dbg, LEVEL_1, "Blockschedule:\n"));
 368
 369         for (entry = first; entry != NULL; entry = entry->next) {
 370                 assert(i < count);
 371                 block_list[i++] = entry->block;
 372                 DBG((dbg, LEVEL_1, "\t%+F\n", entry->block));
 373         }
 374         assert(i == count);
 375
 376         return block_list;
 377 }
 378
 379 static ir_node **create_block_schedule_greedy(ir_graph *irg, ir_exec_freq *execfreqs)
 380 {
 381         blocksched_env_t   env;
 382         struct obstack     obst;
 383         blocksched_entry_t *start_entry;
 384         ir_node            **block_list;
 385
 386         obstack_init(&obst);
 387
 388         env.irg        = irg;
 389         env.obst       = &obst;
 390         env.execfreqs  = execfreqs;
 391         env.edges      = NEW_ARR_F(edge_t, 0);
 392         env.worklist   = NULL;
 393         env.blockcount = 0;
 394
 395         // collect edge execution frequencies
 396         irg_block_walk_graph(irg, collect_egde_frequency, NULL, &env);
 397
 398         // sort interblock edges by execution frequency
 399         qsort(env.edges, ARR_LEN(env.edges), sizeof(env.edges[0]), cmp_edges);
 400
 401         (void)be_remove_empty_blocks(irg);
 402
 403         if (algo != BLOCKSCHED_NAIV)
 404                 coalesce_blocks(&env);
 405
 406         start_entry = finish_block_schedule(&env);
 407         block_list  = create_blocksched_array(&env, start_entry, env.blockcount, get_irg_obstack(irg));
 408
 409         DEL_ARR_F(env.edges);
 410         obstack_free(&obst, NULL);
 411
 412         return block_list;
 413 }
 414
 415 /*
 416  *  ___ _     ____
 417  * |_ _| |   |  _ \
 418  *  | || |   | |_) |
 419  *  | || |___|  __/
 420  * |___|_____|_|
 421  *
 422  */
 423
 424 #ifdef WITH_ILP
 425 typedef struct _ilp_edge_t {
 426         ir_node *block;   /**< source block */
 427         int     pos;      /**< number of cfg predecessor (target) */
 428         int     ilpvar;
 429 } ilp_edge_t;
 430
 431 typedef struct _blocksched_ilp_env_t {
 432         blocksched_env_t env;
 433         ilp_edge_t       *ilpedges;
 434         lpp_t            *lpp;
 435 } blocksched_ilp_env_t;
 436
 437 typedef struct _blocksched_ilp_entry_t {
 438         ir_node *block;
 439         struct _blocksched_entry_t *next;
 440         struct _blocksched_entry_t *prev;
 441
 442         int out_cst;
 443 } blocksched_ilp_entry_t;
 444
 445 static int add_ilp_edge(ir_node *block, int pos, double execfreq, blocksched_ilp_env_t *env)
 446 {
 447         char       name[64];
 448         ilp_edge_t edge;
 449         int        edgeidx = ARR_LEN(env->ilpedges);
 450
 451         snprintf(name, sizeof(name), "edge%d", edgeidx);
 452
 453         edge.block  = block;
 454         edge.pos    = pos;
 455         edge.ilpvar = lpp_add_var_default(env->lpp, name, lpp_binary, execfreq, 1.0);
 456
 457         ARR_APP1(ilp_edge_t, env->ilpedges, edge);
 458         return edgeidx;
 459 }
 460
 461 static void collect_egde_frequency_ilp(ir_node *block, void *data)
 462 {
 463         blocksched_ilp_env_t *env        = data;
 464         ir_graph             *irg        = env->env.irg;
 465         ir_node              *startblock = get_irg_start_block(irg);
 466         int                  arity;
 467         lpp_cst_t            cst;
 468         char                 name[64];
 469         int                  out_count;
 470         blocksched_ilp_entry_t *entry;
 471
 472         snprintf(name, sizeof(name), "block_out_constr_%ld", get_irn_node_nr(block));
 473         out_count = get_irn_n_edges_kind(block, EDGE_KIND_BLOCK);
 474
 475         entry          = obstack_alloc(env->env.obst, sizeof(entry[0]));
 476         entry->block   = block;
 477         entry->next    = NULL;
 478         entry->prev    = NULL;
 479         entry->out_cst = lpp_add_cst_uniq(env->lpp, name, lpp_greater, out_count - 1);
 480         set_irn_link(block, entry);
 481
 482         if (block == startblock)
 483                 return;
 484
 485         arity = get_irn_arity(block);
 486         if (arity == 1) {
 487                 double execfreq = get_block_execfreq(env->env.execfreqs, block);
 488                 add_ilp_edge(block, 0, execfreq, env);
 489         }
 490         else {
 491                 int i;
 492                 int *edgenums = alloca(sizeof(edgenums[0]) * arity);
 493
 494                 snprintf(name, sizeof(name), "block_in_constr_%ld", get_irn_node_nr(block));
 495                 cst = lpp_add_cst_uniq(env->lpp, name, lpp_greater, arity - 1);
 496
 497                 for (i = 0; i < arity; ++i) {
 498                         double     execfreq;
 499                         int        edgenum;
 500                         ilp_edge_t *edge;
 501                         ir_node    *pred_block = get_Block_cfgpred_block(block, i);
 502
 503                         execfreq = get_block_execfreq(env->env.execfreqs, pred_block);
 504                         edgenum  = add_ilp_edge(block, i, execfreq, env);
 505                         edge     = &env->ilpedges[edgenum];
 506                         lpp_set_factor_fast(env->lpp, cst, edge->ilpvar, 1.0);
 507                 }
 508         }
 509 }
 510
 511
 512 static void coalesce_blocks_ilp(blocksched_ilp_env_t *env)
 513 {
 514         int  i;
 515         int  edge_count = ARR_LEN(env->ilpedges);
 516
 517         /* complete out constraints */
 518         for(i = 0; i < edge_count; ++i) {
 519                 const ilp_edge_t *edge  = &env->ilpedges[i];
 520                 ir_node          *block = edge->block;
 521                 ir_node          *pred;
 522                 blocksched_ilp_entry_t *entry;
 523
 524                 /* the block might have been removed already... */
 525                 if (is_Bad(get_Block_cfgpred(block, 0)))
 526                         continue;
 527
 528                 pred  = get_Block_cfgpred_block(block, edge->pos);
 529                 entry = get_irn_link(pred);
 530
 531                 DBG((dbg, LEVEL_1, "Adding out cst to %+F from %+F,%d\n",
 532                                   pred, block, edge->pos));
 533                 lpp_set_factor_fast(env->lpp, entry->out_cst, edge->ilpvar, 1.0);
 534         }
 535
 536 #if 0
 537         {
 538                 FILE *f;
 539                 char fname[256];
 540                 lpp_dump(env->lpp, "lpp.out");
 541                 snprintf(fname, sizeof(fname), "lpp_%s.plain", get_irg_dump_name(env->env.irg));
 542                 f = fopen(fname, "w");
 543                 lpp_dump_plain(env->lpp, f);
 544                 fclose(f);
 545         }
 546 #endif
 547
 548         //lpp_solve_net(env->lpp, main_env->options->ilp_server, main_env->options->ilp_solver);
 549         lpp_solve_net(env->lpp, "i44pc52", "cplex");
 550         assert(lpp_is_sol_valid(env->lpp));
 551
 552         /* Apply results to edges */
 553         for (i = 0; i < edge_count; ++i) {
 554                 const ilp_edge_t   *edge  = &env->ilpedges[i];
 555                 ir_node            *block = edge->block;
 556                 ir_node            *pred;
 557                 int                is_jump;
 558                 blocksched_entry_t *entry;
 559                 blocksched_entry_t *pred_entry;
 560
 561                 /* the block might have been removed already... */
 562                 if (is_Bad(get_Block_cfgpred(block, 0)))
 563                         continue;
 564
 565                 is_jump = (int)lpp_get_var_sol(env->lpp, edge->ilpvar);
 566                 if (is_jump)
 567                         continue;
 568
 569                 pred       = get_Block_cfgpred_block(block, edge->pos);
 570                 entry      = get_irn_link(block);
 571                 pred_entry = get_irn_link(pred);
 572
 573                 assert(entry->prev == NULL && pred_entry->next == NULL);
 574                 entry->prev      = pred_entry;
 575                 pred_entry->next = entry;
 576         }
 577 }
 578
 579 static ir_node **create_block_schedule_ilp(ir_graph *irg, ir_exec_freq *execfreqs)
 580 {
 581         blocksched_ilp_env_t env;
 582         struct obstack       obst;
 583         blocksched_entry_t   *start_entry;
 584         ir_node              **block_list;
 585
 586         obstack_init(&obst);
 587
 588         env.env.irg        = irg;
 589         env.env.obst       = &obst;
 590         env.env.execfreqs  = execfreqs;
 591         env.env.worklist   = NULL;
 592         env.env.blockcount = 0;
 593         env.ilpedges       = NEW_ARR_F(ilp_edge_t, 0);
 594
 595         env.lpp = new_lpp("blockschedule", lpp_minimize);
 596         lpp_set_time_limit(env.lpp, 20);
 597         lpp_set_log(env.lpp, stdout);
 598
 599         irg_block_walk_graph(irg, collect_egde_frequency_ilp, NULL, &env);
 600
 601         (void)be_remove_empty_blocks(irg);
 602         coalesce_blocks_ilp(&env);
 603
 604         start_entry = finish_block_schedule(&env.env);
 605         block_list  = create_blocksched_array(&env.env, start_entry, env.env.blockcount, get_irg_obstack(irg));
 606
 607         DEL_ARR_F(env.ilpedges);
 608         free_lpp(env.lpp);
 609         obstack_free(&obst, NULL);
 610
 611         return block_list;
 612 }
 613 #endif /* WITH_ILP */
 614
 615 /*
 616  *  _____      _   ____  ____
 617  * | ____|_  _| |_| __ )| __ )
 618  * |  _| \ \/ / __|  _ \|  _ \
 619  * | |___ >  <| |_| |_) | |_) |
 620  * |_____/_/\_\\__|____/|____/
 621  *
 622  */
 623
 624 /** A simple forward single linked list. */
 625 typedef struct {
 626         ir_node  *start;   /**< start of the list */
 627         ir_node  *end;     /**< last block in the list */
 628         unsigned n_blks;  /**< number of blocks in the list */
 629 } anchor;
 630
 631 static void add_block(anchor *list, ir_node *block) {
 632         if (list->start == NULL) {
 633                 list->start = block;
 634                 list->end   = block;
 635         } else {
 636                 set_irn_link(list->end, block);
 637                 list->end = block;
 638         }
 639
 640         list->n_blks++;
 641 }
 642
 643 static void create_block_list(ir_node *leader_block, anchor *list) {
 644         int             i;
 645         const ir_edge_t *edge;
 646         ir_node         *block = NULL;
 647         ir_extblk       *extbb = get_Block_extbb(leader_block);
 648
 649         if (extbb_visited(extbb))
 650                 return;
 651         mark_extbb_visited(extbb);
 652
 653         for (i = 0; i < get_extbb_n_blocks(extbb); ++i) {
 654                 block = get_extbb_block(extbb, i);
 655                 add_block(list, block);
 656         }
 657
 658         assert(block != NULL);
 659
 660         /* pick successor extbbs */
 661         foreach_block_succ(block, edge) {
 662                 ir_node *succ = get_edge_src_irn(edge);
 663                 create_block_list(succ, list);
 664         }
 665
 666         for (i = 0; i < get_extbb_n_blocks(extbb) - 1; ++i) {
 667                 block = get_extbb_block(extbb, i);
 668
 669                 foreach_block_succ(block, edge) {
 670                         ir_node *succ = get_edge_src_irn(edge);
 671                         create_block_list(succ, list);
 672                 }
 673         }
 674 }
 675
 676 void compute_extbb_execfreqs(ir_graph *irg, ir_exec_freq *execfreqs);
 677
 678 /*
 679  * Calculates a block schedule. The schedule is stored as a linked
 680  * list starting at the start_block of the irg.
 681  */
 682 static ir_node **create_extbb_block_schedule(ir_graph *irg, ir_exec_freq *execfreqs)
 683 {
 684         anchor list;
 685         ir_node **blk_list, *b, *n;
 686         unsigned i;
 687
 688         /* schedule extended basic blocks */
 689         compute_extbb_execfreqs(irg, execfreqs);
 690         //compute_extbb(irg);
 691
 692         list.start  = NULL;
 693         list.end    = NULL;
 694         list.n_blks = 0;
 695
 696         set_using_irn_link(irg);
 697         set_using_visited(irg);
 698         inc_irg_block_visited(irg);
 699
 700         create_block_list(get_irg_start_block(irg), &list);
 701
 702         /** create an array, so we can go forward and backward */
 703         blk_list = NEW_ARR_D(ir_node *, irg->obst,list.n_blks);
 704
 705         for (i = 0, b = list.start; b; b = n, ++i) {
 706                 n = get_irn_link(b);
 707                 blk_list[i] = b;
 708         }
 709
 710         clear_using_irn_link(irg);
 711         clear_using_visited(irg);
 712
 713         return blk_list;
 714 }
 715
 716 /*
 717  *  __  __       _
 718  * |  \/  | __ _(_)_ __
 719  * | |\/| |/ _` | | '_ \
 720  * | |  | | (_| | | | | |
 721  * |_|  |_|\__,_|_|_| |_|
 722  *
 723  */
 724 void be_init_blocksched(void)
 725 {
 726         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
 727         lc_opt_entry_t *blocksched_grp = lc_opt_get_grp(be_grp, "blocksched");
 728
 729         lc_opt_add_table(blocksched_grp, be_blocksched_options);
 730
 731         FIRM_DBG_REGISTER(dbg, "firm.be.blocksched");
 732 }
 733
 734 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_blocksched);
 735
 736 ir_node **be_create_block_schedule(ir_graph *irg, ir_exec_freq *execfreqs)
 737 {
 738         switch(algo) {
 739         case BLOCKSCHED_GREEDY:
 740         case BLOCKSCHED_NAIV:
 741                 return create_block_schedule_greedy(irg, execfreqs);
 742         case BLOCKSCHED_EXTBB:
 743                 return create_extbb_block_schedule(irg, execfreqs);
 744 #ifdef WITH_ILP
 745         case BLOCKSCHED_ILP:
 746                 return create_block_schedule_ilp(irg, execfreqs);
 747 #endif /* WITH_ILP */
 748         }
 749
 750         assert(0 && "unknown blocksched algo");
 751         return NULL;
 752 }