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

   1 /*
   2  * Author:      Matthias Braun
   3  * Date:                26.7.06
   4  * Copyright:   (c) Universitaet Karlsruhe
   5  * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
   6  */
   7 #ifdef HAVE_CONFIG_H
   8 #include "config.h"
   9 #endif
  10
  11 #include <stdlib.h>
  12
  13 #include "set.h"
  14
  15 #include "irgwalk.h"
  16 #include "ircons.h"
  17 #include "irprintf.h"
  18 #include "execfreq.h"
  19 #include "unionfind.h"
  20 #include "type.h"
  21 #include "irdump_t.h"
  22
  23 #include "benode_t.h"
  24 #include "bespillslots.h"
  25 #include "bechordal_t.h"
  26 #include "bejavacoal.h"
  27
  28
  29 #define DBG_COALESCING          1
  30 #define DBG_INTERFERENCES       2
  31
  32 DEBUG_ONLY(
  33 static firm_dbg_module_t *dbg = NULL;
  34 )
  35
  36 typedef struct _spill_t {
  37         ir_node *spill;
  38         /** regclass of the spilled value */
  39         const arch_register_class_t *cls;
  40         /** index into spillslot_unionfind unionfind structure */
  41         int spillslot;
  42 } spill_t;
  43
  44 typedef struct _affinity_edge_t {
  45         double affinity;
  46         int slot1, slot2;
  47 } affinity_edge_t;
  48
  49 typedef struct _ss_env_t {
  50         struct obstack obst;
  51         const be_chordal_env_t *chordal_env;
  52         set *spills;
  53         ir_node **reloads;
  54         affinity_edge_t **affinity_edges;
  55         set *memperms;
  56 } ss_env_t;
  57
  58 /** Compare 2 affinity edges (used in quicksort) */
  59 static int cmp_affinity(const void *d1, const void *d2) {
  60         const affinity_edge_t *e1 = d1;
  61         const affinity_edge_t *e2 = d2;
  62
  63         return e1->affinity < e2->affinity ? -1 : 1;
  64 }
  65
  66 static int cmp_spill(const void* d1, const void* d2, size_t size) {
  67         const spill_t* s1 = d1;
  68         const spill_t* s2 = d2;
  69         return s1->spill != s2->spill;
  70 }
  71
  72 static spill_t *get_spill(ss_env_t *env, ir_node *node) {
  73         spill_t spill, *res;
  74         int hash = HASH_PTR(node);
  75
  76         spill.spill = node;
  77         res = set_find(env->spills, &spill, sizeof(spill), hash);
  78
  79         return res;
  80 }
  81
  82 /*
  83  *   ____      _ _           _     ____        _ _ _
  84  *  / ___|___ | | | ___  ___| |_  / ___| _ __ (_) | |___
  85  * | |   / _ \| | |/ _ \/ __| __| \___ \| '_ \| | | / __|
  86  * | |__| (_) | | |  __/ (__| |_   ___) | |_) | | | \__ \
  87  *  \____\___/|_|_|\___|\___|\__| |____/| .__/|_|_|_|___/
  88  *                                      |_|
  89  */
  90
  91 static spill_t *collect_spill(ss_env_t *env, ir_node *node, const arch_register_class_t *cls) {
  92         spill_t spill, *res;
  93         int hash = HASH_PTR(node);
  94
  95         assert(be_is_Spill(node));
  96
  97         spill.spill = node;
  98         res = set_find(env->spills, &spill, sizeof(spill), hash);
  99
 100         if(res == NULL) {
 101                 spill.spillslot = set_count(env->spills);
 102                 spill.cls = cls;
 103                 res = set_insert(env->spills, &spill, sizeof(spill), hash);
 104         } else {
 105                 assert(cls == res->cls);
 106         }
 107
 108         return res;
 109 }
 110
 111 static spill_t *collect_memphi(ss_env_t *env, ir_node *node, const arch_register_class_t *cls) {
 112         int i, arity;
 113         spill_t spill, *res;
 114         int hash = HASH_PTR(node);
 115
 116         assert(is_Phi(node));
 117
 118         spill.spill = node;
 119         res = set_find(env->spills, &spill, sizeof(spill), hash);
 120         if(res != NULL) {
 121                 return res;
 122         }
 123
 124         spill.spillslot = set_count(env->spills);
 125         spill.cls = cls;
 126         res = set_insert(env->spills, &spill, sizeof(spill), hash);
 127
 128         // is 1 of the arguments a spill?
 129         for(i = 0, arity = get_irn_arity(node); i < arity; ++i) {
 130                 affinity_edge_t *affinty_edge;
 131                 ir_node* arg = get_irn_n(node, i);
 132                 spill_t* arg_spill;
 133
 134                 if(be_is_Spill(arg)) {
 135                         arg_spill = collect_spill(env, arg, cls);
 136                 } else {
 137                         // if it wasn't a spill then it must be a Mem-Phi
 138                         assert(is_Phi(arg));
 139                         arg_spill = collect_memphi(env, arg, cls);
 140                 }
 141
 142                 // add an affinity edge
 143                 affinty_edge = obstack_alloc(&env->obst, sizeof(affinty_edge[0]));
 144                 affinty_edge->affinity = get_block_execfreq(env->chordal_env->exec_freq, get_nodes_block(arg));
 145                 affinty_edge->slot1 = res->spillslot;
 146                 affinty_edge->slot2 = arg_spill->spillslot;
 147                 ARR_APP1(affinity_edge_t*, env->affinity_edges, affinty_edge);
 148         }
 149
 150         return res;
 151 }
 152
 153 /**
 154  * This walker function searches for reloads and collects all the spills
 155  * and memphis attached to them.
 156  */
 157 static void collect_spills_walker(ir_node *node, void *data) {
 158         ss_env_t *env = data;
 159
 160         if(be_is_Reload(node)) {
 161                 ir_node *spill = get_irn_n(node, be_pos_Reload_mem);
 162                 const arch_env_t *arch_env = env->chordal_env->birg->main_env->arch_env;
 163                 const arch_register_class_t *cls = arch_get_irn_reg_class(arch_env, node, -1);
 164
 165                 if(is_Phi(spill)) {
 166                         collect_memphi(env, spill, cls);
 167                 } else {
 168                         collect_spill(env, spill, cls);
 169                 }
 170                 ARR_APP1(ir_node*, env->reloads, node);
 171         }
 172 }
 173
 174 /*
 175  *   ____            _                      ____  _       _
 176  *  / ___|___   __ _| | ___  ___  ___ ___  / ___|| | ___ | |_ ___
 177  * | |   / _ \ / _` | |/ _ \/ __|/ __/ _ \ \___ \| |/ _ \| __/ __|
 178  * | |__| (_) | (_| | |  __/\__ \ (_|  __/  ___) | | (_) | |_\__ \
 179  *  \____\___/ \__,_|_|\___||___/\___\___| |____/|_|\___/ \__|___/
 180  */
 181
 182 static int merge_interferences(ss_env_t *env, bitset_t** interferences, int* spillslot_unionfind, int s1, int s2)
 183 {
 184         int res;
 185         int i;
 186         int spillcount;
 187
 188         // merge spillslots and interferences
 189         res = uf_union(spillslot_unionfind, s1, s2);
 190         // we assume that we always merge s2 to s1 so swap s1, s2 if necessary
 191         if(res != 0) {
 192                 int t = s1;
 193                 s1 = s2;
 194                 s2 = t;
 195         }
 196
 197         bitset_or(interferences[s1], interferences[s2]);
 198
 199         // update other interferences
 200         spillcount = set_count(env->spills);
 201         for(i = 0; i < spillcount; ++i) {
 202                 bitset_t *intfs = interferences[i];
 203                 if(bitset_is_set(intfs, s2))
 204                         bitset_set(intfs, s1);
 205         }
 206
 207         return res;
 208 }
 209
 210 #if 0
 211
 212 static void dump_interference_graph(ss_env_t *env, bitset_t **interferences, const char* suffix) {
 213         char name[256];
 214         int i;
 215         int spillcount;
 216         spill_t *spill;
 217         FILE *f;
 218         static int cnt = 0;
 219
 220         snprintf(name, sizeof(name), "%d-%s-spillslots-%s.vcg", cnt++, get_irg_dump_name(env->chordal_env->birg->irg), suffix);
 221
 222         f = fopen(name, "w");
 223         assert(f != NULL);
 224
 225         fprintf(f, "graph: {\n");
 226
 227         spillcount = set_count(env->spills);
 228         for(spill = set_first(env->spills), i = 0; spill != NULL; spill = set_next(env->spills), ++i) {
 229                 int slotid = spill->spillslot;
 230                 fprintf(f, "\tnode: { title: \"n%d\" label: \"%d\" }\n", i, slotid);
 231         }
 232
 233         for(i = 0; i < ARR_LEN(env->affinity_edges); ++i) {
 234                 affinity_edge_t *edge = env->affinity_edges[i];
 235                 fprintf(f, "\tedge: { sourcename: \"n%d\" targetname: \"n%d\" color: green }\n", edge->slot1, edge->slot2);
 236         }
 237
 238         for(i = 0; i < spillcount; ++i) {
 239                 int i2;
 240                 for(i2 = 0; i2 < spillcount; ++i2) {
 241                         if(bitset_is_set(interferences[i], i2)) {
 242                                 fprintf(f, "\tedge: { sourcename: \"n%d\" targetname: \"n%d\" color: red }\n", i, i2);
 243                         }
 244                 }
 245         }
 246
 247         fprintf(f, "}\n");
 248         fclose(f);
 249 }
 250
 251 static void show_stats(ss_env_t *env) {
 252         int spillcount;
 253         int slotcount;
 254         int *slotused;
 255         spill_t *spill;
 256
 257         spillcount = set_count(env->spills);
 258         fprintf(stderr, "%s: Collected %d spills\n", get_irg_dump_name(env->chordal_env->birg->irg), spillcount);
 259
 260         slotused = alloca(spillcount * sizeof(slotused[0]));
 261         memset(slotused, 0, spillcount * sizeof(slotused[0]));
 262
 263         slotcount = 0;
 264         for(spill = set_first(env->spills); spill != NULL; spill = set_next(env->spills)) {
 265                 int slot = spill->spillslot;
 266                 if(slotused[slot] == 0) {
 267                         slotused[slot] = 1;
 268                         slotcount++;
 269                 }
 270         }
 271
 272         fprintf(stderr, "%s: Coalesced to %d spillslots\n", get_irg_dump_name(env->chordal_env->birg->irg), slotcount);
 273 }
 274
 275 #endif
 276
 277 static void assign_spillslots(ss_env_t *env);
 278
 279 /**
 280  * A greedy coalescing algorithm for spillslots:
 281  *  1. Sort the list of affinity edges
 282  *  2. Try to merge slots with affinity edges (most expensive slots first)
 283  *  3. Try to merge everything else that is possible
 284  */
 285 static void do_greedy_coalescing(ss_env_t *env)
 286 {
 287         int spillcount;
 288         spill_t **spilllist;
 289         spill_t *spill;
 290         int i, i2;
 291         int affinity_edge_count;
 292         bitset_t **interferences;
 293         int* spillslot_unionfind;
 294
 295         spillcount = set_count(env->spills);
 296         if(spillcount == 0)
 297                 return;
 298
 299         DBG((dbg, DBG_COALESCING, "Coalescing %d spillslots\n", spillcount));
 300
 301         interferences = alloca(spillcount * sizeof(interferences[0]));
 302         spillslot_unionfind = alloca(spillcount * sizeof(spillslot_unionfind[0]));
 303         spilllist = alloca(spillcount * sizeof(spilllist[0]));
 304
 305         uf_init(spillslot_unionfind, 0, spillcount);
 306
 307         DEBUG_ONLY(
 308                 memset(spilllist, 0, spillcount * sizeof(spilllist[0]));
 309         );
 310
 311         for(spill = set_first(env->spills), i = 0; spill != NULL; spill = set_next(env->spills), ++i) {
 312                 assert(spill->spillslot < spillcount);
 313                 spilllist[spill->spillslot] = spill;
 314         }
 315
 316         for(i = 0; i < spillcount; ++i) {
 317                 interferences[i] = bitset_alloca(spillcount);
 318         }
 319
 320         // construct interferences
 321         for(i = 0; i < spillcount; ++i) {
 322                 for(i2 = i+1; i2 < spillcount; ++i2) {
 323                         if(values_interfere(env->chordal_env->lv, spilllist[i]->spill, spilllist[i2]->spill)) {
 324                                 DBG((dbg, DBG_INTERFERENCES, "Slot %d and %d interfere\n", i, i2));
 325                                 bitset_set(interferences[i], i2);
 326                                 bitset_set(interferences[i2], i);
 327                         }
 328                 }
 329         }
 330
 331         // sort affinity edges
 332         affinity_edge_count = ARR_LEN(env->affinity_edges);
 333         qsort(env->affinity_edges, affinity_edge_count, sizeof(env->affinity_edges[0]), cmp_affinity);
 334
 335         //dump_interference_graph(env, interferences, "before");
 336
 337         // try to merge affine nodes
 338         for(i = 0; i < affinity_edge_count; ++i) {
 339                 const affinity_edge_t *edge = env->affinity_edges[i];
 340                 int s1 = uf_find(spillslot_unionfind, edge->slot1);
 341                 int s2 = uf_find(spillslot_unionfind, edge->slot2);
 342
 343                 /* test if values interfere */
 344                 if(bitset_is_set(interferences[s1], s2)) {
 345                         assert(bitset_is_set(interferences[s2], s1));
 346                         continue;
 347                 }
 348
 349                 DBG((dbg, DBG_COALESCING, "Merging %d and %d because of affinity edge\n", s1, s2));
 350
 351                 merge_interferences(env, interferences, spillslot_unionfind, s1, s2);
 352         }
 353
 354         // try to merge as much remaining spillslots as possible
 355         for(i = 0; i < spillcount; ++i) {
 356                 int s1 = uf_find(spillslot_unionfind, i);
 357                 if(s1 != i)
 358                         continue;
 359
 360                 for(i2 = i+1; i2 < spillcount; ++i2) {
 361                         int s2 = uf_find(spillslot_unionfind, i2);
 362                         if(s2 != i2)
 363                                 continue;
 364
 365                         /* test if values interfere
 366                          * we have to test n1-n2 and n2-n1, because only 1 side gets updated
 367                          * when node merging occurs
 368                          */
 369                         if(bitset_is_set(interferences[s1], s2)) {
 370                                 assert(bitset_is_set(interferences[s2], s1));
 371                                 continue;
 372                         }
 373
 374                         DBG((dbg, DBG_COALESCING, "Merging %d and %d because it is possible\n", s1, s2));
 375
 376                         if(merge_interferences(env, interferences, spillslot_unionfind, s1, s2) != 0) {
 377                                 // we can break the loop here, because s2 is the new supernode now
 378                                 // and we'll test s2 again later anyway
 379                                 break;
 380                         }
 381                 }
 382         }
 383
 384         // assign spillslots
 385         for(i = 0; i < spillcount; ++i) {
 386                 spill_t *spill = spilllist[i];
 387
 388                 spill->spillslot = uf_find(spillslot_unionfind, i);
 389         }
 390
 391         //dump_interference_graph(env, interferences, "after");
 392 }
 393
 394 #if 0
 395 static void do_java_coalescing(ss_env_t *env)
 396 {
 397         int spillcount;
 398         spill_t **spilllist;
 399         spill_t *spill;
 400         int i, i2;
 401         be_java_coal_t *coal;
 402
 403         spillcount = set_count(env->spills);
 404         if(spillcount == 0)
 405                 return;
 406
 407         spilllist = alloca(spillcount * sizeof(spilllist[0]));
 408
 409         DEBUG_ONLY(
 410                 memset(spilllist, 0, spillcount * sizeof(spilllist[0]));
 411         );
 412
 413         coal = be_java_coal_init("spillslot coalescing", spillcount, spillcount, 1);
 414
 415         for(spill = set_first(env->spills), i = 0; spill != NULL; spill = set_next(env->spills), ++i) {
 416                 assert(spill->spillslot < spillcount);
 417                 DEBUG_ONLY(assert(spilllist[spill->spillslot] == NULL));
 418                 spilllist[spill->spillslot] = spill;
 419
 420                 be_java_coal_set_color(coal, spill->spillslot, spill->spillslot);
 421         }
 422
 423         // construct interferences
 424         for(i = 0; i < spillcount; ++i) {
 425                 for(i2 = i+1; i2 < spillcount; ++i2) {
 426                         if(values_interfere(env->chordal_env->lv, spilllist[i]->spill, spilllist[i2]->spill)) {
 427                                 be_java_coal_add_int_edge(coal, i, i2);
 428                         }
 429                 }
 430         }
 431
 432         for(i = 0; i < ARR_LEN(env->affinity_edges); ++i) {
 433                 const affinity_edge_t *edge = env->affinity_edges[i];
 434                 int n = edge->slot1;
 435                 int m = edge->slot2;
 436                 int costs = (int) (edge->affinity * 10000);
 437                 be_java_coal_add_aff_edge(coal, n, m, costs);
 438         }
 439
 440         be_java_coal_coalesce(coal);
 441
 442         // construct spillslots
 443         for(i = 0; i < spillcount; ++i) {
 444                 spill_t *spill = spilllist[i];
 445                 spill->spillslot = be_java_coal_get_color(coal, i);
 446         }
 447         be_java_coal_destroy(coal);
 448 }
 449 #endif
 450
 451 /*
 452  *     _            _               _____       _   _ _   _
 453  *    / \   ___ ___(_) __ _ _ __   | ____|_ __ | |_(_) |_(_) ___  ___
 454  *   / _ \ / __/ __| |/ _` | '_ \  |  _| | '_ \| __| | __| |/ _ \/ __|
 455  *  / ___ \\__ \__ \ | (_| | | | | | |___| | | | |_| | |_| |  __/\__ \
 456  * /_/   \_\___/___/_|\__, |_| |_| |_____|_| |_|\__|_|\__|_|\___||___/
 457  *                    |___/
 458  */
 459
 460 typedef struct _spill_slot_t {
 461         int size;
 462         int align;
 463         entity   *entity;
 464 } spill_slot_t;
 465
 466 typedef struct _memperm_entry_t {
 467         ir_node* node;
 468         int pos;
 469         entity *in;
 470         entity *out;
 471         struct _memperm_entry_t *next;
 472 } memperm_entry_t;
 473
 474 typedef struct _memperm_t {
 475         ir_node *block;
 476         int entrycount;
 477         memperm_entry_t *entries;
 478 } memperm_t;
 479
 480 static int cmp_memperm(const void* d1, const void* d2, size_t size) {
 481         const memperm_t* e1 = d1;
 482         const memperm_t* e2 = d2;
 483         return e1->block != e2->block;
 484 }
 485
 486 static memperm_t *get_memperm(ss_env_t *env, ir_node *block) {
 487         memperm_t entry, *res;
 488         int hash;
 489
 490         entry.block = block;
 491         hash = HASH_PTR(block);
 492
 493         res = set_find(env->memperms, &entry, sizeof(entry), hash);
 494
 495         if(res == NULL) {
 496                 entry.entrycount = 0;
 497                 entry.entries = NULL;
 498                 res = set_insert(env->memperms, &entry, sizeof(entry), hash);
 499         }
 500
 501         return res;
 502 }
 503
 504 static entity* create_stack_entity(ss_env_t *env, spill_slot_t *slot) {
 505         ir_type* frame = get_irg_frame_type(env->chordal_env->irg);
 506         entity* res = frame_alloc_area(frame, slot->size, slot->align, 0);
 507
 508         slot->entity = res;
 509
 510         return res;
 511 }
 512
 513 static int get_spillslotsize_for_spill(ss_env_t *env, spill_t *spill) {
 514         const ir_mode *mode = arch_register_class_mode(spill->cls);
 515
 516         return get_mode_size_bytes(mode);
 517 }
 518
 519 static int get_spillslotalign_for_spill(ss_env_t *env, spill_t *spill) {
 520         const arch_isa_t *isa = env->chordal_env->birg->main_env->arch_env->isa;
 521
 522         return arch_isa_get_reg_class_alignment(isa, spill->cls);
 523 }
 524
 525 /**
 526  * Enlarges a spillslot (if necessary) so that it can carry a value of size
 527  * @p othersize and alignment @p otheralign.
 528  */
 529 static void enlarge_spillslot(spill_slot_t *slot, int otheralign, int othersize) {
 530         if(othersize > slot->size) {
 531                 slot->size = othersize;
 532         }
 533         if(otheralign > slot->align) {
 534                 if(otheralign % slot->align != 0)
 535                         slot->align *= otheralign;
 536                 else
 537                         slot->align = otheralign;
 538         } else if(slot->align % otheralign != 0) {
 539                 slot->align *= otheralign;
 540         }
 541 }
 542
 543 /**
 544  * Create stack entities for the spillslots and assign them to the spill and
 545  * reload nodes.
 546  */
 547 static void assign_spillslots(ss_env_t *env) {
 548         int i;
 549         int spillcount;
 550         spill_t *spill;
 551         spill_slot_t* spillslots;
 552
 553         spillcount = set_count(env->spills);
 554         spillslots = alloca(spillcount * sizeof(spillslots[0]));
 555
 556         memset(spillslots, 0, spillcount * sizeof(spillslots[0]));
 557
 558         // construct spillslots
 559         for(spill = set_first(env->spills); spill != NULL; spill = set_next(env->spills)) {
 560                 int slotid = spill->spillslot;
 561                 spill_slot_t *slot = & (spillslots[slotid]);
 562                 int align = get_spillslotalign_for_spill(env, spill);
 563                 int size = get_spillslotsize_for_spill(env, spill);
 564
 565                 if(slot->align == 0 && slot->size == 0) {
 566                         slot->align = align;
 567                         slot->size = size;
 568                 } else {
 569                         enlarge_spillslot(slot, align, size);
 570                 }
 571         }
 572
 573         for(spill = set_first(env->spills); spill != NULL; spill = set_next(env->spills)) {
 574                 spill_slot_t *slot;
 575                 ir_node *node = spill->spill;
 576                 int slotid = spill->spillslot;
 577
 578                 slot = &spillslots[slotid];
 579                 if(slot->entity == NULL) {
 580                         create_stack_entity(env, slot);
 581                 }
 582
 583                 if(be_is_Spill(node)) {
 584                         be_set_frame_entity(node, slot->entity);
 585                 } else {
 586                         int i, arity;
 587
 588                         // should be a PhiM
 589                         assert(is_Phi(node));
 590
 591                         for(i = 0, arity = get_irn_arity(node); i < arity; ++i) {
 592                                 ir_node *arg = get_irn_n(node, i);
 593                                 spill_t *argspill;
 594                                 int argslotid;
 595
 596                                 argspill = get_spill(env, arg);
 597                                 assert(argspill != NULL);
 598
 599                                 argslotid = argspill->spillslot;
 600                                 if(slotid != argslotid) {
 601                                         memperm_t *memperm;
 602                                         memperm_entry_t *entry;
 603                                         spill_slot_t *argslot = &spillslots[argslotid];
 604                                         if(argslot->entity == NULL) {
 605                                                 create_stack_entity(env, argslot);
 606                                         }
 607
 608                                         memperm = get_memperm(env, get_nodes_block(arg));
 609
 610                                         entry = obstack_alloc(&env->obst, sizeof(entry[0]));
 611                                         entry->node = node;
 612                                         entry->pos = i;
 613                                         entry->in = argslot->entity;
 614                                         entry->out = slot->entity;
 615                                         entry->next = memperm->entries;
 616                                         memperm->entrycount++;
 617                                         memperm->entries = entry;
 618                                 }
 619                         }
 620                 }
 621         }
 622
 623         for(i = 0; i < ARR_LEN(env->reloads); ++i) {
 624                 const ir_node* reload = env->reloads[i];
 625                 ir_node* spillnode = get_irn_n(reload, be_pos_Reload_mem);
 626                 spill_t *spill = get_spill(env, spillnode);
 627                 const spill_slot_t *slot = & spillslots[spill->spillslot];
 628
 629                 assert(slot->entity != NULL);
 630
 631                 be_set_frame_entity(reload, slot->entity);
 632         }
 633 }
 634
 635 static void create_memperms(ss_env_t *env) {
 636         memperm_t *memperm;
 637
 638         for(memperm = set_first(env->memperms); memperm != NULL; memperm = set_next(env->memperms)) {
 639                 int i;
 640                 memperm_entry_t *entry;
 641                 ir_node** nodes = alloca(memperm->entrycount * sizeof(nodes[0]));
 642                 ir_node* mempermnode;
 643
 644                 assert(memperm->entrycount > 0);
 645
 646                 for(entry = memperm->entries, i = 0; entry != NULL; entry = entry->next, ++i) {
 647                         ir_node* arg = get_irn_n(entry->node, entry->pos);
 648                         nodes[i] = arg;
 649                 }
 650
 651                 mempermnode = be_new_MemPerm(env->chordal_env->birg->main_env->arch_env, env->chordal_env->irg, memperm->block,
 652                         memperm->entrycount, nodes);
 653
 654                 for(entry = memperm->entries, i = 0; entry != NULL; entry = entry->next, ++i) {
 655                         ir_node *proj;
 656                         ir_node* arg = get_irn_n(entry->node, entry->pos);
 657
 658                         be_set_MemPerm_in_entity(mempermnode, i, entry->in);
 659                         be_set_MemPerm_out_entity(mempermnode, i, entry->out);
 660                         proj = new_Proj(mempermnode, get_irn_mode(arg), i);
 661                         set_irn_n(entry->node, entry->pos, proj);
 662                 }
 663                 ir_printf("Memperm created in block %+F\n", memperm->block);
 664         }
 665 }
 666
 667 void be_coalesce_spillslots(const be_chordal_env_t *chordal_env) {
 668         ss_env_t env;
 669
 670         obstack_init(&env.obst);
 671         env.chordal_env = chordal_env;
 672         env.spills = new_set(cmp_spill, 10);
 673         env.reloads = NEW_ARR_F(ir_node*, 0);
 674         env.affinity_edges = NEW_ARR_F(affinity_edge_t*, 0);
 675         env.memperms = new_set(cmp_memperm, 10);
 676         FIRM_DBG_REGISTER(dbg, "firm.be.spillslots");
 677         //firm_dbg_set_mask(dbg, DBG_COALESCING);
 678
 679         /* Get initial spill slots */
 680         irg_walk_graph(chordal_env->irg, NULL, collect_spills_walker, &env);
 681
 682         do_greedy_coalescing(&env);
 683
 684         assign_spillslots(&env);
 685
 686         create_memperms(&env);
 687
 688         //show_stats(&env);
 689
 690         del_set(env.memperms);
 691         DEL_ARR_F(env.reloads);
 692         DEL_ARR_F(env.affinity_edges);
 693         del_set(env.spills);
 694         obstack_free(&env.obst, NULL);
 695 }