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

   1 /** vim: set sw=4 ts=4:
   2  * @file   bespillremat.c
   3  * @date   2006-04-06
   4  * @author Adam M. Szalkowski & Sebastian Hack
   5  *
   6  * ILP based spilling & rematerialization
   7  *
   8  * Copyright (C) 2006 Universitaet Karlsruhe
   9  * Released under the GPL
  10  */
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #ifdef WITH_ILP
  16
  17 #include <math.h>
  18
  19 #include "hashptr.h"
  20 #include "debug.h"
  21 #include "obst.h"
  22 #include "set.h"
  23 #include "list.h"
  24 #include "pmap.h"
  25
  26 #include "irprintf.h"
  27 #include "irgwalk.h"
  28 #include "irdump_t.h"
  29 #include "irnode_t.h"
  30 #include "ircons_t.h"
  31 #include "irloop_t.h"
  32 #include "phiclass_t.h"
  33 #include "iredges.h"
  34 #include "execfreq.h"
  35 #include "irvrfy.h"
  36
  37 #include <lpp/lpp.h>
  38 #include <lpp/mps.h>
  39 #include <lpp/lpp_net.h>
  40 #include <lpp/lpp_cplex.h>
  41 //#include <lc_pset.h>
  42 #include <libcore/lc_bitset.h>
  43
  44 #include "be_t.h"
  45 #include "belive_t.h"
  46 #include "besched_t.h"
  47 #include "beirgmod.h"
  48 #include "bearch.h"
  49 #include "benode_t.h"
  50 #include "beutil.h"
  51 #include "bespillremat.h"
  52 #include "bespill.h"
  53 #include "bepressurestat.h"
  54
  55 #include "bechordal_t.h"
  56
  57 #ifdef WITH_LIBCORE
  58 #include <libcore/lc_opts.h>
  59 #include <libcore/lc_opts_enum.h>
  60 #endif /* WITH_LIBCORE */
  61
  62 #define DUMP_PROBLEM       1
  63 #define DUMP_MPS           2
  64 #define DUMP_SOLUTION      4
  65
  66 #define KEEPALIVE_REMATS   1
  67 #define KEEPALIVE_SPILLS   2
  68 #define KEEPALIVE_RELOADS  4
  69
  70 #define VERIFY_MEMINTERF   1
  71 #define VERIFY_DOMINANCE   2
  72
  73 #define REMATS_NONE        0
  74 #define REMATS_BRIGGS      1
  75 #define REMATS_NOINVERSE   2
  76 #define REMATS_ALL         3
  77
  78 static int opt_dump_flags   = 0;
  79 static int opt_log = 0;
  80 static int opt_keep_alive   = 0;
  81 static int opt_goodwin = 1;
  82 static int opt_memcopies = 1;
  83 static int opt_memoperands = 1;
  84 static int opt_verify = VERIFY_MEMINTERF;
  85 static int opt_remats = REMATS_ALL;
  86 static int opt_repair_schedule = 0;
  87 static int opt_no_enlarge_liveness = 0;
  88 static int opt_remat_while_live = 1;
  89 static int opt_timeout = 300;
  90 static double opt_cost_reload = 8.0;
  91 static double opt_cost_memoperand =  7.0;
  92 static double opt_cost_spill =  50.0;
  93 static double opt_cost_remat =  1.0;
  94
  95
  96 #ifdef WITH_LIBCORE
  97 static const lc_opt_enum_mask_items_t dump_items[] = {
  98         { "problem",  DUMP_PROBLEM  },
  99         { "mps",      DUMP_MPS      },
 100         { "solution", DUMP_SOLUTION },
 101         { NULL,       0 }
 102 };
 103
 104 static lc_opt_enum_mask_var_t dump_var = {
 105         &opt_dump_flags, dump_items
 106 };
 107
 108 static const lc_opt_enum_mask_items_t keepalive_items[] = {
 109         { "remats",  KEEPALIVE_REMATS  },
 110         { "spills",  KEEPALIVE_SPILLS  },
 111         { "reloads", KEEPALIVE_RELOADS },
 112         { NULL,      0 }
 113 };
 114
 115 static lc_opt_enum_mask_var_t keep_alive_var = {
 116         &opt_keep_alive, keepalive_items
 117 };
 118
 119 static const lc_opt_enum_mask_items_t remats_items[] = {
 120         { "none",      REMATS_NONE      },
 121         { "briggs",    REMATS_BRIGGS    },
 122         { "noinverse", REMATS_NOINVERSE },
 123         { "ALL",       REMATS_ALL       },
 124         { NULL,        0 }
 125 };
 126
 127 static lc_opt_enum_mask_var_t remats_var = {
 128         &opt_remats, remats_items
 129 };
 130
 131 static const lc_opt_table_entry_t options[] = {
 132         LC_OPT_ENT_ENUM_MASK("keepalive", "keep alive remats, spills or reloads",                   &keep_alive_var),
 133
 134         LC_OPT_ENT_BOOL     ("goodwin",  "activate goodwin reduction",                              &opt_goodwin),
 135         LC_OPT_ENT_BOOL     ("memcopies",  "activate memcopy handling",                             &opt_memcopies),
 136         LC_OPT_ENT_BOOL     ("memoperands",  "activate memoperands",                                &opt_memoperands),
 137         LC_OPT_ENT_ENUM_INT ("remats",  "type of remats to insert (none, briggs, noinverse or all)",&remats_var),
 138         LC_OPT_ENT_BOOL     ("repair_schedule",  "repair the schedule by rematting once used nodes",&opt_repair_schedule),
 139         LC_OPT_ENT_BOOL     ("no_enlage_liveness",  "do not enlarge liveness of operands of remats",&opt_no_enlarge_liveness),
 140         LC_OPT_ENT_BOOL     ("remat_while_live",  "remat only values that can be used by real ops", &opt_remat_while_live),
 141
 142         LC_OPT_ENT_ENUM_MASK("dump", "dump ifg before, after or after each cloud",                  &dump_var),
 143         LC_OPT_ENT_BOOL     ("log",  "activate the lpp log",                                        &opt_log),
 144         LC_OPT_ENT_INT      ("timeout",  "ILP solver timeout",                                      &opt_timeout),
 145
 146         LC_OPT_ENT_DBL      ("cost_reload",  "cost of a reload",                                    &opt_cost_reload),
 147         LC_OPT_ENT_DBL      ("cost_memoperand",  "cost of a memory operand",                        &opt_cost_memoperand),
 148         LC_OPT_ENT_DBL      ("cost_spill",  "cost of a spill instruction",                          &opt_cost_spill),
 149         LC_OPT_ENT_DBL      ("cost_remat",  "cost of a rematerialization",                          &opt_cost_remat),
 150         { NULL }
 151 };
 152
 153 void be_spill_remat_register_options(lc_opt_entry_t *grp)
 154 {
 155         lc_opt_entry_t *my_grp = lc_opt_get_grp(grp, "remat");
 156         lc_opt_add_table(my_grp, options);
 157 }
 158 #endif
 159
 160
 161 //#define EXECFREQ_LOOPDEPH /* compute execution frequency from loop depth only */
 162
 163 #define  SOLVE
 164 //#define  SOLVE_LOCAL
 165 #define LPP_SERVER "i44pc52"
 166 #define LPP_SOLVER "cplex"
 167
 168
 169 #define MAX_PATHS      16
 170 #define ILP_UNDEF               -1
 171
 172 typedef struct _spill_ilp_t {
 173         const arch_register_class_t  *cls;
 174         int                           n_regs;
 175         const be_chordal_env_t       *chordal_env;
 176         be_lv_t                      *lv;
 177         lpp_t                        *lpp;
 178         struct obstack               *obst;
 179         set                          *remat_info;
 180         pset                         *all_possible_remats;
 181         pset                         *inverse_ops;
 182         ir_node                      *keep;
 183         set                          *values; /**< for collecting all definitions of values before running ssa-construction */
 184         pset                         *spills;
 185         set                          *interferences;
 186         ir_node                      *m_unknown;
 187         set                          *memoperands;
 188         DEBUG_ONLY(firm_dbg_module_t * dbg);
 189 } spill_ilp_t;
 190
 191 typedef int ilp_var_t;
 192 typedef int ilp_cst_t;
 193
 194 typedef struct _spill_bb_t {
 195         set      *ilp;
 196         set      *reloads;
 197 } spill_bb_t;
 198
 199 typedef struct _remat_t {
 200         const ir_node        *op;      /**< for copy_irn */
 201         const ir_node        *value;   /**< the value which is being recomputed by this remat */
 202         const ir_node        *proj;    /**< not NULL if the above op produces a tuple */
 203         int                   cost;    /**< cost of this remat */
 204         int                   inverse; /**< nonzero if this is an inverse remat */
 205 } remat_t;
 206
 207 /**
 208  * Data to be attached to each IR node. For remats this contains the ilp_var
 209  * for this remat and for normal ops this contains the ilp_vars for
 210  * reloading each operand
 211  */
 212 typedef struct _op_t {
 213         int             is_remat;
 214         union {
 215                 struct {
 216                         ilp_var_t       ilp;
 217                         const remat_t  *remat; /** the remat this op belongs to */
 218                         int             pre; /** 1, if this is a pressure-increasing remat */
 219                 } remat;
 220                 struct {
 221                         ilp_var_t       ilp;
 222                         ir_node        *op; /** the operation this live range belongs to */
 223                         union {
 224                                 ilp_var_t      *reloads;
 225                                 ilp_var_t      *copies;
 226                         } args;
 227                 } live_range;
 228         } attr;
 229 } op_t;
 230
 231 typedef struct _defs_t {
 232         const ir_node   *value;
 233         ir_node         *spills;  /**< points to the first spill for this value (linked by link field) */
 234         ir_node         *remats;  /**< points to the first definition for this value (linked by link field) */
 235 } defs_t;
 236
 237 typedef struct _remat_info_t {
 238         const ir_node       *irn; /**< the irn to which these remats belong */
 239         pset                *remats; /**< possible remats for this value */
 240         pset                *remats_by_operand; /**< remats with this value as operand */
 241 } remat_info_t;
 242
 243 typedef struct _keyval_t {
 244         const void          *key;
 245         const void          *val;
 246 } keyval_t;
 247
 248 typedef struct _spill_t {
 249         ir_node            *irn;
 250         ilp_var_t           reg_in;
 251         ilp_var_t           mem_in;
 252         ilp_var_t           reg_out;
 253         ilp_var_t           mem_out;
 254         ilp_var_t           spill;
 255 } spill_t;
 256
 257 typedef struct _memoperand_t {
 258         ir_node             *irn; /**< the irn */
 259         unsigned int         pos; /**< the position of the argument */
 260         ilp_var_t            ilp; /**< the ilp var for this memory operand */
 261 } memoperand_t;
 262
 263 static INLINE int
 264 has_reg_class(const spill_ilp_t * si, const ir_node * irn)
 265 {
 266         return chordal_has_class(si->chordal_env, irn);
 267 }
 268
 269 #if 0
 270 static int
 271 cmp_remat(const void *a, const void *b)
 272 {
 273         const keyval_t *p = a;
 274         const keyval_t *q = b;
 275         const remat_t  *r = p->val;
 276         const remat_t  *s = q->val;
 277
 278         assert(r && s);
 279
 280         return !(r == s || r->op == s->op);
 281 }
 282 #endif
 283 static int
 284 cmp_remat(const void *a, const void *b)
 285 {
 286         const remat_t  *r = a;
 287         const remat_t  *s = a;
 288
 289         return !(r == s || r->op == s->op);
 290 }
 291
 292 static int
 293 cmp_spill(const void *a, const void *b, size_t size)
 294 {
 295         const spill_t *p = a;
 296         const spill_t *q = b;
 297
 298 //      return !(p->irn == q->irn && p->bb == q->bb);
 299         return !(p->irn == q->irn);
 300 }
 301
 302 static int
 303 cmp_memoperands(const void *a, const void *b, size_t size)
 304 {
 305         const memoperand_t *p = a;
 306         const memoperand_t *q = b;
 307
 308         return !(p->irn == q->irn && p->pos == q->pos);
 309 }
 310
 311 static keyval_t *
 312 set_find_keyval(set * set, const void * key)
 313 {
 314         keyval_t     query;
 315
 316         query.key = key;
 317         return set_find(set, &query, sizeof(query), HASH_PTR(key));
 318 }
 319
 320 static keyval_t *
 321 set_insert_keyval(set * set, void * key, void * val)
 322 {
 323         keyval_t     query;
 324
 325         query.key = key;
 326         query.val = val;
 327         return set_insert(set, &query, sizeof(query), HASH_PTR(key));
 328 }
 329
 330 static defs_t *
 331 set_find_def(set * set, const ir_node * value)
 332 {
 333         defs_t     query;
 334
 335         query.value = value;
 336         return set_find(set, &query, sizeof(query), HASH_PTR(value));
 337 }
 338
 339 static defs_t *
 340 set_insert_def(set * set, const ir_node * value)
 341 {
 342         defs_t     query;
 343
 344         query.value = value;
 345         query.spills = NULL;
 346         query.remats = NULL;
 347         return set_insert(set, &query, sizeof(query), HASH_PTR(value));
 348 }
 349
 350 static memoperand_t *
 351 set_insert_memoperand(set * set, ir_node * irn, unsigned int pos, ilp_var_t ilp)
 352 {
 353         memoperand_t     query;
 354
 355         query.irn = irn;
 356         query.pos = pos;
 357         query.ilp = ilp;
 358         return set_insert(set, &query, sizeof(query), HASH_PTR(irn)+pos);
 359 }
 360
 361 static memoperand_t *
 362 set_find_memoperand(set * set, const ir_node * irn, unsigned int pos)
 363 {
 364         memoperand_t     query;
 365
 366         query.irn = (ir_node*)irn;
 367         query.pos = pos;
 368         return set_find(set, &query, sizeof(query), HASH_PTR(irn)+pos);
 369 }
 370
 371
 372 static spill_t *
 373 set_find_spill(set * set, const ir_node * value)
 374 {
 375         spill_t     query;
 376
 377         query.irn = (ir_node*)value;
 378         return set_find(set, &query, sizeof(query), HASH_PTR(value));
 379 }
 380
 381 #define pset_foreach(s,i) for((i)=pset_first((s)); (i); (i)=pset_next((s)))
 382 #define set_foreach(s,i) for((i)=set_first((s)); (i); (i)=set_next((s)))
 383 #define foreach_post_remat(s,i) for((i)=next_post_remat((s)); (i); (i)=next_post_remat((i)))
 384 #define foreach_pre_remat(si,s,i) for((i)=next_pre_remat((si),(s)); (i); (i)=next_pre_remat((si),(i)))
 385 #define sched_foreach_op(s,i) for((i)=sched_next_op((s));!sched_is_end((i));(i)=sched_next_op((i)))
 386
 387 static int
 388 cmp_remat_info(const void *a, const void *b, size_t size)
 389 {
 390         const remat_info_t *p = a;
 391         const remat_info_t *q = b;
 392
 393         return !(p->irn == q->irn);
 394 }
 395
 396 static int
 397 cmp_defs(const void *a, const void *b, size_t size)
 398 {
 399         const defs_t *p = a;
 400         const defs_t *q = b;
 401
 402         return !(p->value == q->value);
 403 }
 404
 405 static int
 406 cmp_keyval(const void *a, const void *b, size_t size)
 407 {
 408         const keyval_t *p = a;
 409         const keyval_t *q = b;
 410
 411         return !(p->key == q->key);
 412 }
 413
 414 static double
 415 execution_frequency(const spill_ilp_t *si, const ir_node * irn)
 416 {
 417 #define FUDGE 0.001
 418 #ifndef EXECFREQ_LOOPDEPH
 419         return get_block_execfreq(si->chordal_env->exec_freq, get_block(irn)) + FUDGE;
 420 #else
 421         if(is_Block(irn))
 422                 return exp(get_loop_depth(get_irn_loop(irn)) * log(10)) + FUDGE;
 423         else
 424                 return exp(get_loop_depth(get_irn_loop(get_nodes_block(irn))) * log(10)) + FUDGE;
 425 #endif
 426 }
 427
 428 static double
 429 get_cost(const spill_ilp_t * si, const ir_node * irn)
 430 {
 431         if(be_is_Spill(irn)) {
 432                 return opt_cost_spill;
 433         } else if(be_is_Reload(irn)){
 434                 return opt_cost_reload;
 435         } else {
 436                 return arch_get_op_estimated_cost(si->chordal_env->birg->main_env->arch_env, irn);
 437         }
 438 }
 439
 440 /**
 441  * Checks, whether node and its operands have suitable reg classes
 442  */
 443 static INLINE int
 444 is_rematerializable(const spill_ilp_t * si, const ir_node * irn)
 445 {
 446         int               n;
 447         const arch_env_t *arch_env = si->chordal_env->birg->main_env->arch_env;
 448         int               remat = (arch_irn_get_flags(arch_env, irn) & arch_irn_flags_rematerializable) != 0;
 449
 450 #if 0
 451         if(!remat)
 452                 ir_fprintf(stderr, "  Node %+F is not rematerializable\n", irn);
 453 #endif
 454
 455         for (n = get_irn_arity(irn)-1; n>=0 && remat; --n) {
 456                 ir_node        *op = get_irn_n(irn, n);
 457                 remat &= has_reg_class(si, op) || arch_irn_get_flags(arch_env, op) & arch_irn_flags_ignore || (get_irn_op(op) == op_NoMem);
 458
 459 //              if(!remat)
 460 //                      ir_fprintf(stderr, "  Argument %d (%+F) of Node %+F has wrong regclass\n", i, op, irn);
 461         }
 462
 463         return remat;
 464 }
 465
 466 /**
 467  * Try to create a remat from @p op with destination value @p dest_value
 468  */
 469 static INLINE remat_t *
 470 get_remat_from_op(spill_ilp_t * si, const ir_node * dest_value, const ir_node * op)
 471 {
 472         remat_t  *remat = NULL;
 473
 474 //      if(!mode_is_datab(get_irn_mode(dest_value)))
 475 //              return NULL;
 476
 477         if(dest_value == op) {
 478                 const ir_node *proj = NULL;
 479
 480                 if(is_Proj(dest_value)) {
 481                         op = get_irn_n(op, 0);
 482                         proj = dest_value;
 483                 }
 484
 485                 if(!is_rematerializable(si, op))
 486                         return NULL;
 487
 488                 remat = obstack_alloc(si->obst, sizeof(*remat));
 489                 remat->op = op;
 490                 remat->cost = get_cost(si, op);
 491                 remat->value = dest_value;
 492                 remat->proj = proj;
 493                 remat->inverse = 0;
 494         } else {
 495                 arch_inverse_t     inverse;
 496                 int                n;
 497
 498                 /* get the index of the operand we want to retrieve by the inverse op */
 499                 for (n = get_irn_arity(op)-1; n>=0; --n) {
 500                         ir_node        *arg = get_irn_n(op, n);
 501
 502                         if(arg == dest_value) break;
 503                 }
 504                 if(n<0) return NULL;
 505
 506                 DBG((si->dbg, LEVEL_5, "\t  requesting inverse op for argument %d of op %+F\n", n, op));
 507
 508                 /* else ask the backend to give an inverse op */
 509                 if(arch_get_inverse(si->chordal_env->birg->main_env->arch_env, op, n, &inverse, si->obst)) {
 510                         int   i;
 511
 512                         DBG((si->dbg, LEVEL_4, "\t  backend gave us an inverse op with %d nodes and cost %d\n", inverse.n, inverse.costs));
 513
 514                         assert(inverse.n > 0 && "inverse op should have at least one node");
 515
 516                         for(i=inverse.n-1; i>=0; --i) {
 517                                 pset_insert_ptr(si->inverse_ops, inverse.nodes[i]);
 518                         }
 519
 520                         if(inverse.n <= 2) {
 521                                 remat = obstack_alloc(si->obst, sizeof(*remat));
 522                                 remat->op = inverse.nodes[0];
 523                                 remat->cost = inverse.costs;
 524                                 remat->value = dest_value;
 525                                 remat->proj = (inverse.n==2)?inverse.nodes[1]:NULL;
 526                                 remat->inverse = 1;
 527
 528                                 assert(is_Proj(remat->proj));
 529                         } else {
 530                                 assert(0 && "I can not handle remats with more than 2 nodes");
 531                         }
 532                 }
 533         }
 534
 535         if(remat) {
 536                 if(remat->proj) {
 537                         DBG((si->dbg, LEVEL_3, "\t >Found remat %+F for %+F from %+F with %+F\n", remat->op, dest_value, op, remat->proj));
 538                 } else {
 539                         DBG((si->dbg, LEVEL_3, "\t >Found remat %+F for %+F from %+F\n", remat->op, dest_value, op));
 540                 }
 541         }
 542         return remat;
 543 }
 544
 545
 546 static INLINE void
 547 add_remat(const spill_ilp_t * si, const remat_t * remat)
 548 {
 549         remat_info_t    *remat_info,
 550                      query;
 551         int              n;
 552
 553         assert(remat->op);
 554         assert(remat->value);
 555
 556         query.irn = remat->value;
 557         query.remats = NULL;
 558         query.remats_by_operand = NULL;
 559         remat_info = set_insert(si->remat_info, &query, sizeof(query), HASH_PTR(remat->value));
 560
 561         if(remat_info->remats == NULL) {
 562                 remat_info->remats = new_pset(cmp_remat, 4096);
 563         }
 564         pset_insert(remat_info->remats, remat, HASH_PTR(remat->op));
 565
 566         /* insert the remat into the remats_be_operand set of each argument of the remat op */
 567         for (n = get_irn_arity(remat->op)-1; n>=0; --n) {
 568                 ir_node        *arg = get_irn_n(remat->op, n);
 569
 570                 query.irn = arg;
 571                 query.remats = NULL;
 572                 query.remats_by_operand = NULL;
 573                 remat_info = set_insert(si->remat_info, &query, sizeof(query), HASH_PTR(arg));
 574
 575                 if(remat_info->remats_by_operand == NULL) {
 576                         remat_info->remats_by_operand = new_pset(cmp_remat, 4096);
 577                 }
 578                 pset_insert(remat_info->remats_by_operand, remat, HASH_PTR(remat->op));
 579         }
 580 }
 581
 582 static int
 583 get_irn_n_nonremat_edges(const spill_ilp_t * si, const ir_node * irn)
 584 {
 585         const ir_edge_t   *edge = get_irn_out_edge_first(irn);
 586         int                i = 0;
 587
 588         while(edge) {
 589                 if(!pset_find_ptr(si->inverse_ops, edge->src)) {
 590                         ++i;
 591                 }
 592                 edge = get_irn_out_edge_next(irn, edge);
 593         }
 594
 595         return i;
 596 }
 597
 598 static int
 599 get_irn_n_nonignore_args(const spill_ilp_t * si, const ir_node * irn)
 600 {
 601         int n;
 602         unsigned int ret = 0;
 603
 604         for(n=get_irn_arity(irn)-1; n>=0; --n) {
 605                 if(has_reg_class(si, irn)) ++ret;
 606         }
 607
 608         return ret;
 609 }
 610
 611 static INLINE void
 612 get_remats_from_op(spill_ilp_t * si, const ir_node * op)
 613 {
 614         int      n;
 615         remat_t *remat;
 616
 617         if( has_reg_class(si, op)
 618         && (opt_repair_schedule || get_irn_n_nonremat_edges(si, op) > 1)
 619         && (opt_remats !=  REMATS_BRIGGS || get_irn_n_nonignore_args(si, op) == 0)
 620         ) {
 621                 remat = get_remat_from_op(si, op, op);
 622                 if(remat) {
 623                         add_remat(si, remat);
 624                 }
 625         }
 626
 627         if(opt_remats == REMATS_ALL) {
 628                 /* repeat the whole stuff for each remat retrieved by get_remat_from_op(op, arg)
 629                    for each arg */
 630                 for (n = get_irn_arity(op)-1; n>=0; --n) {
 631                         ir_node        *arg = get_irn_n(op, n);
 632
 633                         if(has_reg_class(si, arg)) {
 634                                 /* try to get an inverse remat */
 635                                 remat = get_remat_from_op(si, arg, op);
 636                                 if(remat) {
 637                                         add_remat(si, remat);
 638                                 }
 639                         }
 640                 }
 641         }
 642 }
 643
 644 static INLINE int
 645 value_is_defined_before(const spill_ilp_t * si, const ir_node * pos, const ir_node * val)
 646 {
 647         ir_node *block;
 648         ir_node *def_block = get_nodes_block(val);
 649         int      ret;
 650
 651         if(val == pos)
 652                 return 0;
 653
 654         /* if pos is at end of a basic block */
 655         if(is_Block(pos)) {
 656                 ret = (pos == def_block || block_dominates(def_block, pos));
 657 //              ir_fprintf(stderr, "(def(bb)=%d) ", ret);
 658                 return ret;
 659         }
 660
 661         /* else if this is a normal operation */
 662         block = get_nodes_block(pos);
 663         if(block == def_block) {
 664                 if(!sched_is_scheduled(val)) return 1;
 665
 666                 ret = sched_comes_after(val, pos);
 667 //              ir_fprintf(stderr, "(def(same block)=%d) ",ret);
 668                 return ret;
 669         }
 670
 671         ret = block_dominates(def_block, block);
 672 //      ir_fprintf(stderr, "(def(other block)=%d) ", ret);
 673         return ret;
 674 }
 675
 676 static INLINE ir_node *
 677 sched_block_last_noncf(const spill_ilp_t * si, const ir_node * bb)
 678 {
 679     return sched_skip((ir_node*)bb, 0, sched_skip_cf_predicator, (void *) si->chordal_env->birg->main_env->arch_env);
 680 }
 681
 682 /**
 683  * Returns first non-Phi node of block @p bb
 684  */
 685 static INLINE ir_node *
 686 sched_block_first_nonphi(const ir_node * bb)
 687 {
 688         return sched_skip((ir_node*)bb, 1, sched_skip_phi_predicator, NULL);
 689 }
 690
 691 static int
 692 sched_skip_proj_predicator(const ir_node * irn, void * data)
 693 {
 694         return (is_Proj(irn));
 695 }
 696
 697 static INLINE ir_node *
 698 sched_next_nonproj(const ir_node * irn, int forward)
 699 {
 700         return sched_skip((ir_node*)irn, forward, sched_skip_proj_predicator, NULL);
 701 }
 702
 703 /**
 704  * Returns next operation node (non-Proj) after @p irn
 705  * or the basic block of this node
 706  */
 707 static INLINE ir_node *
 708 sched_next_op(const ir_node * irn)
 709 {
 710         ir_node *next = sched_next(irn);
 711
 712         if(is_Block(next))
 713                 return next;
 714
 715         return sched_next_nonproj(next, 1);
 716 }
 717
 718 /**
 719  * Returns previous operation node (non-Proj) before @p irn
 720  * or the basic block of this node
 721  */
 722 static INLINE ir_node *
 723 sched_prev_op(const ir_node * irn)
 724 {
 725         ir_node *prev = sched_prev(irn);
 726
 727         if(is_Block(prev))
 728                 return prev;
 729
 730         return sched_next_nonproj(prev, 0);
 731 }
 732
 733 static void
 734 sched_put_after(ir_node * insert, ir_node * irn)
 735 {
 736         if(is_Block(insert)) {
 737                 insert = sched_block_first_nonphi(insert);
 738         } else {
 739                 insert = sched_next_op(insert);
 740         }
 741         sched_add_before(insert, irn);
 742 }
 743
 744 static void
 745 sched_put_before(const spill_ilp_t * si, ir_node * insert, ir_node * irn)
 746 {
 747   if(is_Block(insert)) {
 748           insert = sched_block_last_noncf(si, insert);
 749   } else {
 750           insert = sched_next_nonproj(insert, 0);
 751           insert = sched_prev(insert);
 752   }
 753   sched_add_after(insert, irn);
 754 }
 755
 756 /**
 757  * Tells you whether a @p remat can be placed before the irn @p pos
 758  */
 759 static INLINE int
 760 can_remat_before(const spill_ilp_t * si, const remat_t * remat, const ir_node * pos, const pset * live)
 761 {
 762         const ir_node   *op = remat->op;
 763         const ir_node   *prev;
 764         int        n,
 765                            res = 1;
 766
 767         if(is_Block(pos)) {
 768                 prev = sched_block_last_noncf(si, pos);
 769                 prev = sched_next_nonproj(prev, 0);
 770         } else {
 771                 prev = sched_prev_op(pos);
 772         }
 773         /* do not remat if the rematted value is defined immediately before this op */
 774         if(prev == remat->op) {
 775                 return 0;
 776         }
 777
 778 #if 0
 779         /* this should be just fine, the following OP will be using this value, right? */
 780
 781         /* only remat AFTER the real definition of a value (?) */
 782         if(!value_is_defined_before(si, pos, remat->value)) {
 783 //              ir_fprintf(stderr, "error(not defined)");
 784                 return 0;
 785         }
 786 #endif
 787
 788         for(n=get_irn_arity(op)-1; n>=0 && res; --n) {
 789                 const ir_node   *arg = get_irn_n(op, n);
 790
 791                 if(opt_no_enlarge_liveness) {
 792                         if(has_reg_class(si, arg) && live) {
 793                                 res &= pset_find_ptr(live, arg)?1:0;
 794                         } else {
 795                                 res &= value_is_defined_before(si, pos, arg);
 796                         }
 797                 } else {
 798                         res &= value_is_defined_before(si, pos, arg);
 799                 }
 800         }
 801
 802         return res;
 803 }
 804
 805 /**
 806  * Tells you whether a @p remat can be placed after the irn @p pos
 807  */
 808 static INLINE int
 809 can_remat_after(const spill_ilp_t * si, const remat_t * remat, const ir_node * pos, const pset * live)
 810 {
 811         if(is_Block(pos)) {
 812                 pos = sched_block_first_nonphi(pos);
 813         } else {
 814                 pos = sched_next_op(pos);
 815         }
 816
 817         /* only remat AFTER the real definition of a value (?) */
 818         if(!value_is_defined_before(si, pos, remat->value)) {
 819                 return 0;
 820         }
 821
 822         return can_remat_before(si, remat, pos, live);
 823 }
 824
 825 /**
 826  * Collect potetially rematerializable OPs
 827  */
 828 static void
 829 walker_remat_collector(ir_node * irn, void * data)
 830 {
 831         spill_ilp_t    *si = data;
 832
 833         if(!is_Block(irn) && !is_Phi(irn)) {
 834                 DBG((si->dbg, LEVEL_4, "\t  Processing %+F\n", irn));
 835                 get_remats_from_op(si, irn);
 836         }
 837 }
 838
 839 /**
 840  * Inserts a copy of @p irn before @p pos
 841  */
 842 static ir_node *
 843 insert_copy_before(const spill_ilp_t * si, const ir_node * irn, ir_node * pos)
 844 {
 845         ir_node     *bb;
 846         ir_node     *copy;
 847
 848         bb = is_Block(pos)?pos:get_nodes_block(pos);
 849         copy = exact_copy(irn);
 850
 851         _set_phi_class(copy, NULL);
 852         set_nodes_block(copy, bb);
 853         sched_put_before(si, pos, copy);
 854
 855         return copy;
 856 }
 857
 858 /**
 859  * Inserts a copy of @p irn after @p pos
 860  */
 861 static ir_node *
 862 insert_copy_after(const spill_ilp_t * si, const ir_node * irn, ir_node * pos)
 863 {
 864         ir_node     *bb;
 865         ir_node     *copy;
 866
 867         bb = is_Block(pos)?pos:get_nodes_block(pos);
 868         copy = exact_copy(irn);
 869
 870         _set_phi_class(copy, NULL);
 871         set_nodes_block(copy, bb);
 872         sched_put_after(pos, copy);
 873
 874         return copy;
 875 }
 876
 877 static ir_node *
 878 insert_remat_after(spill_ilp_t * si, const remat_t * remat, ir_node * pos, const pset * live)
 879 {
 880         char     buf[256];
 881
 882         if(can_remat_after(si, remat, pos, live)) {
 883                 ir_node         *copy,
 884                                                 *proj_copy;
 885                 op_t            *op;
 886
 887                 DBG((si->dbg, LEVEL_3, "\t  >inserting remat %+F\n", remat->op));
 888
 889                 copy = insert_copy_after(si, remat->op, pos);
 890
 891                 ir_snprintf(buf, sizeof(buf), "remat2_%N_%N", copy, pos);
 892                 op = obstack_alloc(si->obst, sizeof(*op));
 893                 op->is_remat = 1;
 894                 op->attr.remat.remat = remat;
 895                 op->attr.remat.pre = 0;
 896                 op->attr.remat.ilp = lpp_add_var_default(si->lpp, buf, lpp_binary, remat->cost*execution_frequency(si, pos), 0.0);
 897
 898                 set_irn_link(copy, op);
 899                 pset_insert_ptr(si->all_possible_remats, copy);
 900                 if(remat->proj) {
 901                         proj_copy = insert_copy_after(si, remat->proj, copy);
 902                         set_irn_n(proj_copy, 0, copy);
 903                         set_irn_link(proj_copy, op);
 904                         pset_insert_ptr(si->all_possible_remats, proj_copy);
 905                 } else {
 906                         proj_copy = NULL;
 907                 }
 908
 909                 return copy;
 910         }
 911
 912         return NULL;
 913 }
 914
 915 static ir_node *
 916 insert_remat_before(spill_ilp_t * si, const remat_t * remat, ir_node * pos, const pset * live)
 917 {
 918         char     buf[256];
 919
 920         if(can_remat_before(si, remat, pos, live)) {
 921                 ir_node         *copy,
 922                                                 *proj_copy;
 923                 op_t            *op;
 924
 925                 DBG((si->dbg, LEVEL_3, "\t  >inserting remat %+F\n", remat->op));
 926
 927                 copy = insert_copy_before(si, remat->op, pos);
 928
 929                 ir_snprintf(buf, sizeof(buf), "remat_%N_%N", copy, pos);
 930                 op = obstack_alloc(si->obst, sizeof(*op));
 931                 op->is_remat = 1;
 932                 op->attr.remat.remat = remat;
 933                 op->attr.remat.pre = 1;
 934                 op->attr.remat.ilp = lpp_add_var_default(si->lpp, buf, lpp_binary, remat->cost*execution_frequency(si, pos), 0.0);
 935
 936                 set_irn_link(copy, op);
 937                 pset_insert_ptr(si->all_possible_remats, copy);
 938                 if(remat->proj) {
 939                         proj_copy = insert_copy_after(si, remat->proj, copy);
 940                         set_irn_n(proj_copy, 0, copy);
 941                         set_irn_link(proj_copy, op);
 942                         pset_insert_ptr(si->all_possible_remats, proj_copy);
 943                 } else {
 944                         proj_copy = NULL;
 945                 }
 946
 947                 return copy;
 948         }
 949
 950         return NULL;
 951 }
 952
 953 static int
 954 get_block_n_succs(const ir_node *block) {
 955         const ir_edge_t *edge;
 956
 957         assert(edges_activated(current_ir_graph));
 958
 959         edge = get_block_succ_first(block);
 960         if (! edge)
 961                 return 0;
 962
 963         edge = get_block_succ_next(block, edge);
 964         return edge ? 2 : 1;
 965 }
 966
 967 static int
 968 is_merge_edge(const ir_node * bb)
 969 {
 970         if(opt_goodwin)
 971                 return get_block_n_succs(bb) == 1;
 972         else
 973                 return 1;
 974 }
 975
 976 static int
 977 is_diverge_edge(const ir_node * bb)
 978 {
 979         if(opt_goodwin)
 980                 return get_Block_n_cfgpreds(bb) == 1;
 981         else
 982                 return 1;
 983 }
 984
 985 static void
 986 walker_regclass_copy_insertor(ir_node * irn, void * data)
 987 {
 988         spill_ilp_t    *si = data;
 989
 990         if(is_Phi(irn) && has_reg_class(si, irn)) {
 991                 int n;
 992
 993                 for(n=get_irn_arity(irn)-1; n>=0; --n) {
 994                         ir_node  *phi_arg = get_irn_n(irn, n);
 995                         ir_node  *bb = get_Block_cfgpred_block(get_nodes_block(irn), n);
 996
 997                         if(!has_reg_class(si, phi_arg)) {
 998                                 ir_node   *copy = be_new_Copy(si->cls, si->chordal_env->irg, bb, phi_arg);
 999                                 ir_node   *pos = sched_block_last_noncf(si, bb);
1000                                 op_t      *op = obstack_alloc(si->obst, sizeof(*op));
1001
1002                                 DBG((si->dbg, LEVEL_2, "\t copy to my regclass for arg %+F of %+F\n", phi_arg, irn));
1003                                 sched_add_after(pos, copy);
1004                                 set_irn_n(irn, n, copy);
1005
1006                                 op->is_remat = 0;
1007                                 op->attr.live_range.args.reloads = NULL;
1008                                 op->attr.live_range.ilp = ILP_UNDEF;
1009                                 set_irn_link(copy, op);
1010                         }
1011                 }
1012         }
1013 }
1014
1015
1016 /**
1017  * Insert (so far unused) remats into the irg to
1018  * recompute the potential liveness of all values
1019  */
1020 static void
1021 walker_remat_insertor(ir_node * bb, void * data)
1022 {
1023         spill_ilp_t    *si = data;
1024         spill_bb_t     *spill_bb;
1025         ir_node        *irn;
1026         int             n, i;
1027         pset           *live = pset_new_ptr_default();
1028
1029         DBG((si->dbg, LEVEL_3, "\t Entering %+F\n\n", bb));
1030
1031         be_lv_foreach(si->lv, bb, be_lv_state_end, i) {
1032                 ir_node        *value = be_lv_get_irn(si->lv, bb, i);
1033
1034                 /* add remats at end of block */
1035                 if (has_reg_class(si, value)) {
1036                         pset_insert_ptr(live, value);
1037                 }
1038         }
1039
1040         spill_bb = obstack_alloc(si->obst, sizeof(*spill_bb));
1041         set_irn_link(bb, spill_bb);
1042
1043         irn = sched_last(bb);
1044         while(!sched_is_end(irn)) {
1045                 ir_node   *next;
1046                 op_t      *op;
1047                 pset      *args;
1048                 ir_node   *arg;
1049                 pset      *remat_args;
1050
1051                 next = sched_prev(irn);
1052
1053                 DBG((si->dbg, LEVEL_5, "\t at %+F (next: %+F)\n", irn, next));
1054
1055                 if(is_Phi(irn) || is_Proj(irn)) {
1056                         op_t      *op;
1057
1058                         if(has_reg_class(si, irn)) {
1059                                 pset_remove_ptr(live, irn);
1060                         }
1061
1062                         op = obstack_alloc(si->obst, sizeof(*op));
1063                         op->is_remat = 0;
1064                         op->attr.live_range.args.reloads = NULL;
1065                         op->attr.live_range.ilp = ILP_UNDEF;
1066                         set_irn_link(irn, op);
1067
1068                         irn = next;
1069                         continue;
1070                 }
1071
1072                 op = obstack_alloc(si->obst, sizeof(*op));
1073                 op->is_remat = 0;
1074                 op->attr.live_range.ilp = ILP_UNDEF;
1075                 op->attr.live_range.args.reloads = obstack_alloc(si->obst, sizeof(*op->attr.live_range.args.reloads) * get_irn_arity(irn));
1076                 memset(op->attr.live_range.args.reloads, 0xFF, sizeof(*op->attr.live_range.args.reloads) * get_irn_arity(irn));
1077                 set_irn_link(irn, op);
1078
1079                 args = pset_new_ptr_default();
1080
1081                 /* collect arguments of op */
1082                 for (n = get_irn_arity(irn)-1; n>=0; --n) {
1083                         ir_node        *arg = get_irn_n(irn, n);
1084
1085                         pset_insert_ptr(args, arg);
1086                 }
1087
1088                 /* set args of op already live in epilog */
1089                 pset_foreach(args, arg) {
1090                         if(has_reg_class(si, arg)) {
1091                                 pset_insert_ptr(live, arg);
1092                         }
1093                 }
1094                 /* delete defined value from live set */
1095                 if(has_reg_class(si, irn)) {
1096                         pset_remove_ptr(live, irn);
1097                 }
1098
1099
1100                 remat_args = pset_new_ptr_default();
1101
1102                 /* insert all possible remats before irn */
1103                 pset_foreach(args, arg) {
1104                         remat_info_t   *remat_info,
1105                                                     query;
1106                         remat_t        *remat;
1107
1108                         /* continue if the operand has the wrong reg class
1109                          */
1110                         if(!has_reg_class(si, arg))
1111                                 continue;
1112
1113                         query.irn = arg;
1114                         query.remats = NULL;
1115                         query.remats_by_operand = NULL;
1116                         remat_info = set_find(si->remat_info, &query, sizeof(query), HASH_PTR(arg));
1117
1118                         if(!remat_info) {
1119                                 continue;
1120                         }
1121
1122                         if(remat_info->remats) {
1123                                 pset_foreach(remat_info->remats, remat) {
1124                                         ir_node  *remat_irn = NULL;
1125
1126                                         DBG((si->dbg, LEVEL_4, "\t  considering remat %+F for arg %+F\n", remat->op, arg));
1127                                         if(opt_remat_while_live) {
1128                                                 if(pset_find_ptr(live, remat->value)) {
1129                                                         remat_irn = insert_remat_before(si, remat, irn, live);
1130                                                 }
1131                                         } else {
1132                                                 remat_irn = insert_remat_before(si, remat, irn, live);
1133                                         }
1134                                         if(remat_irn) {
1135                                                 for(n=get_irn_arity(remat_irn)-1; n>=0; --n) {
1136                                                         ir_node  *remat_arg = get_irn_n(remat_irn, n);
1137
1138                                                         if(!has_reg_class(si, remat_arg)) continue;
1139
1140                                                         pset_insert_ptr(remat_args, remat_arg);
1141                                                 }
1142                                         }
1143                                 }
1144                         }
1145                 }
1146
1147                 /* now we add remat args to op's args because they could also die at this op */
1148                 pset_foreach(args,arg) {
1149                         if(pset_find_ptr(remat_args, arg)) {
1150                                 pset_remove_ptr(remat_args, arg);
1151                         }
1152                 }
1153                 pset_foreach(remat_args,arg) {
1154                         pset_insert_ptr(args, arg);
1155                 }
1156
1157                 /* insert all possible remats after irn */
1158                 pset_foreach(args, arg) {
1159                         remat_info_t   *remat_info,
1160                                                     query;
1161                         remat_t        *remat;
1162
1163                         /* continue if the operand has the wrong reg class */
1164                         if(!has_reg_class(si, arg))
1165                                 continue;
1166
1167                         query.irn = arg;
1168                         query.remats = NULL;
1169                         query.remats_by_operand = NULL;
1170                         remat_info = set_find(si->remat_info, &query, sizeof(query), HASH_PTR(arg));
1171
1172                         if(!remat_info) {
1173                                 continue;
1174                         }
1175
1176                         /* do not place post remats after jumps */
1177                         if(sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) continue;
1178
1179                         if(remat_info->remats_by_operand) {
1180                                 pset_foreach(remat_info->remats_by_operand, remat) {
1181                                         /* do not insert remats producing the same value as one of the operands */
1182                                         if(!pset_find_ptr(args, remat->value)) {
1183                                                 DBG((si->dbg, LEVEL_4, "\t  considering remat %+F with arg %+F\n", remat->op, arg));
1184                                                 if(opt_remat_while_live) {
1185                                                         if(pset_find_ptr(live, remat->value)) {
1186                                                                 insert_remat_after(si, remat, irn, live);
1187                                                         }
1188                                                 } else {
1189                                                         insert_remat_after(si, remat, irn, live);
1190                                                 }
1191                                         }
1192                                 }
1193                         }
1194                 }
1195
1196                 del_pset(remat_args);
1197                 del_pset(args);
1198                 irn = next;
1199         }
1200
1201         be_lv_foreach(si->lv, bb, be_lv_state_end | be_lv_state_in, i) {
1202                 ir_node        *value = be_lv_get_irn(si->lv, bb, i);
1203
1204                 /* add remats at end if successor has multiple predecessors */
1205                 if(is_merge_edge(bb)) {
1206                         /* add remats at end of block */
1207                         if (be_is_live_end(si->lv, bb, value) && has_reg_class(si, value)) {
1208                                 remat_info_t   *remat_info,
1209                                                            query;
1210                                 remat_t        *remat;
1211
1212                                 query.irn = value;
1213                                 query.remats = NULL;
1214                                 query.remats_by_operand = NULL;
1215                                 remat_info = set_find(si->remat_info, &query, sizeof(query), HASH_PTR(value));
1216
1217                                 if(remat_info && remat_info->remats) {
1218                                         pset_foreach(remat_info->remats, remat) {
1219                                                 DBG((si->dbg, LEVEL_4, "\t  considering remat %+F at end of block %+F\n", remat->op, bb));
1220
1221                                                 insert_remat_before(si, remat, bb, NULL);
1222                                         }
1223                                 }
1224                         }
1225                 }
1226                 if(is_diverge_edge(bb)) {
1227                         /* add remat2s at beginning of block */
1228                         if ((be_is_live_in(si->lv, bb, value) || (is_Phi(value) && get_nodes_block(value)==bb)) && has_reg_class(si, value)) {
1229                                 remat_info_t   *remat_info,
1230                                                            query;
1231                                 remat_t        *remat;
1232
1233                                 query.irn = value;
1234                                 query.remats = NULL;
1235                                 query.remats_by_operand = NULL;
1236                                 remat_info = set_find(si->remat_info, &query, sizeof(query), HASH_PTR(value));
1237
1238                                 if(remat_info && remat_info->remats) {
1239                                         pset_foreach(remat_info->remats, remat) {
1240                                                 DBG((si->dbg, LEVEL_4, "\t  considering remat %+F at beginning of block %+F\n", remat->op, bb));
1241
1242                                                 /* put the remat here if all its args are available */
1243                                                 insert_remat_after(si, remat, bb, NULL);
1244
1245                                         }
1246                                 }
1247                         }
1248                 }
1249         }
1250 }
1251
1252 /**
1253  * Preparation of blocks' ends for Luke Blockwalker(tm)(R)
1254  */
1255 static void
1256 luke_endwalker(ir_node * bb, void * data)
1257 {
1258         spill_ilp_t    *si = (spill_ilp_t*)data;
1259         pset           *live;
1260         pset           *use_end;
1261         char            buf[256];
1262         ilp_cst_t       cst;
1263         ir_node        *irn;
1264         spill_bb_t     *spill_bb = get_irn_link(bb);
1265         int             i;
1266
1267
1268         live = pset_new_ptr_default();
1269         use_end = pset_new_ptr_default();
1270
1271         be_lv_foreach(si->lv, bb, be_lv_state_end, i) {
1272                 irn = be_lv_get_irn(si->lv, bb, i);
1273                 if (has_reg_class(si, irn) && !pset_find_ptr(si->all_possible_remats, irn)) {
1274                         op_t      *op;
1275
1276                         pset_insert_ptr(live, irn);
1277                         op = get_irn_link(irn);
1278                         assert(!op->is_remat);
1279                 }
1280         }
1281
1282         /* collect values used by cond jumps etc. at bb end (use_end) -> always live */
1283         /* their reg_out must always be set */
1284         sched_foreach_reverse(bb, irn) {
1285                 int   n;
1286
1287                 if(!sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) break;
1288
1289                 for (n=get_irn_arity(irn)-1; n>=0; --n) {
1290                         ir_node        *irn_arg = get_irn_n(irn, n);
1291
1292                         if(has_reg_class(si, irn_arg)) {
1293                                 pset_insert_ptr(use_end, irn_arg);
1294                         }
1295                 }
1296         }
1297
1298         ir_snprintf(buf, sizeof(buf), "check_end_%N", bb);
1299         //cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, si->n_regs);
1300         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, si->n_regs - pset_count(use_end));
1301
1302         spill_bb->ilp = new_set(cmp_spill, pset_count(live)+pset_count(use_end));
1303
1304         /* if this is a merge edge we can reload at the end of this block */
1305         if(is_merge_edge(bb)) {
1306                 spill_bb->reloads = new_set(cmp_keyval, pset_count(live)+pset_count(use_end));
1307         } else if(pset_count(use_end)){
1308                 spill_bb->reloads = new_set(cmp_keyval, pset_count(use_end));
1309         } else {
1310                 spill_bb->reloads = NULL;
1311         }
1312
1313         pset_foreach(live,irn) {
1314                 spill_t     query,
1315                                         *spill;
1316                 double      spill_cost;
1317                 int         default_spilled;
1318
1319
1320                 /* handle values used by control flow nodes later separately */
1321                 if(pset_find_ptr(use_end, irn)) continue;
1322
1323                 query.irn = irn;
1324                 spill = set_insert(spill_bb->ilp, &query, sizeof(query), HASH_PTR(irn));
1325
1326                 spill_cost = is_Unknown(irn)?0.0001:opt_cost_spill*execution_frequency(si, bb);
1327
1328                 ir_snprintf(buf, sizeof(buf), "reg_out_%N_%N", irn, bb);
1329                 spill->reg_out = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
1330                 lpp_set_factor_fast(si->lpp, cst, spill->reg_out, 1.0);
1331
1332                 ir_snprintf(buf, sizeof(buf), "mem_out_%N_%N", irn, bb);
1333                 spill->mem_out = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 1.0);
1334
1335                 ir_snprintf(buf, sizeof(buf), "spill_%N_%N", irn, bb);
1336                 /* by default spill value right after definition */
1337                 default_spilled = be_is_live_in(si->lv, bb, irn) || is_Phi(irn);
1338                 spill->spill    = lpp_add_var_default(si->lpp, buf, lpp_binary, spill_cost, !default_spilled);
1339
1340                 if(is_merge_edge(bb)) {
1341                         ilp_var_t   reload;
1342                         ilp_cst_t   rel_cst;
1343
1344                         ir_snprintf(buf, sizeof(buf), "reload_%N_%N", bb, irn);
1345                         reload = lpp_add_var_default(si->lpp, buf, lpp_binary, opt_cost_reload*execution_frequency(si, bb), 1.0);
1346                         set_insert_keyval(spill_bb->reloads, irn, INT_TO_PTR(reload));
1347
1348                         /* reload <= mem_out */
1349                         rel_cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
1350                         lpp_set_factor_fast(si->lpp, rel_cst, reload, 1.0);
1351                         lpp_set_factor_fast(si->lpp, rel_cst, spill->mem_out, -1.0);
1352                 }
1353
1354                 spill->reg_in = ILP_UNDEF;
1355                 spill->mem_in = ILP_UNDEF;
1356         }
1357
1358         pset_foreach(use_end,irn) {
1359                 spill_t     query,
1360                                         *spill;
1361                 double      spill_cost;
1362                 ilp_cst_t   end_use_req,
1363                                         rel_cst;
1364                 ilp_var_t   reload;
1365                 int         default_spilled;
1366
1367                 query.irn = irn;
1368                 spill = set_insert(spill_bb->ilp, &query, sizeof(query), HASH_PTR(irn));
1369
1370                 spill_cost = is_Unknown(irn)?0.0001:opt_cost_spill*execution_frequency(si, bb);
1371
1372                 ir_snprintf(buf, sizeof(buf), "reg_out_%N_%N", irn, bb);
1373                 spill->reg_out = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 1.0);
1374                 /* if irn is used at the end of the block, then it is live anyway */
1375                 //lpp_set_factor_fast(si->lpp, cst, spill->reg_out, 1.0);
1376
1377                 ir_snprintf(buf, sizeof(buf), "mem_out_%N_%N", irn, bb);
1378                 spill->mem_out = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 1.0);
1379
1380                 ir_snprintf(buf, sizeof(buf), "spill_%N_%N", irn, bb);
1381                 default_spilled = be_is_live_in(si->lv, bb, irn) || is_Phi(irn);
1382                 spill->spill    = lpp_add_var_default(si->lpp, buf, lpp_binary, spill_cost, !default_spilled);
1383
1384                 /* reload for use be control flow op */
1385                 ir_snprintf(buf, sizeof(buf), "reload_%N_%N", bb, irn);
1386                 reload = lpp_add_var_default(si->lpp, buf, lpp_binary, opt_cost_reload*execution_frequency(si, bb), 1.0);
1387                 set_insert_keyval(spill_bb->reloads, irn, INT_TO_PTR(reload));
1388
1389                 /* reload <= mem_out */
1390                 rel_cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
1391                 lpp_set_factor_fast(si->lpp, rel_cst, reload, 1.0);
1392                 lpp_set_factor_fast(si->lpp, rel_cst, spill->mem_out, -1.0);
1393
1394                 spill->reg_in = ILP_UNDEF;
1395                 spill->mem_in = ILP_UNDEF;
1396
1397                 ir_snprintf(buf, sizeof(buf), "req_cf_end_%N_%N", irn, bb);
1398                 end_use_req = lpp_add_cst_uniq(si->lpp, buf, lpp_equal, 1);
1399                 lpp_set_factor_fast(si->lpp, end_use_req, spill->reg_out, 1.0);
1400         }
1401
1402         del_pset(live);
1403         del_pset(use_end);
1404 }
1405
1406 static ir_node *
1407 next_post_remat(const ir_node * irn)
1408 {
1409         op_t      *op;
1410     ir_node   *next;
1411
1412         if(is_Block(irn)) {
1413                 next = sched_block_first_nonphi(irn);
1414         } else {
1415                 next = sched_next_op(irn);
1416         }
1417
1418         if(sched_is_end(next))
1419                 return NULL;
1420
1421         op = get_irn_link(next);
1422         if(op->is_remat && !op->attr.remat.pre) {
1423                 return next;
1424         }
1425
1426         return NULL;
1427 }
1428
1429
1430 static ir_node *
1431 next_pre_remat(const spill_ilp_t * si, const ir_node * irn)
1432 {
1433         op_t      *op;
1434         ir_node   *ret;
1435
1436         if(is_Block(irn)) {
1437                 ret = sched_block_last_noncf(si, irn);
1438                 ret = sched_next(ret);
1439                 ret = sched_prev_op(ret);
1440         } else {
1441                 ret = sched_prev_op(irn);
1442         }
1443
1444         if(sched_is_end(ret) || is_Phi(ret))
1445                 return NULL;
1446
1447         op = (op_t*)get_irn_link(ret);
1448         if(op->is_remat && op->attr.remat.pre) {
1449                 return ret;
1450         }
1451
1452         return NULL;
1453 }
1454
1455 /**
1456  * Find a remat of value @p value in the epilog of @p pos
1457  */
1458 static ir_node *
1459 find_post_remat(const ir_node * value, const ir_node * pos)
1460 {
1461         while((pos = next_post_remat(pos)) != NULL) {
1462                 op_t   *op;
1463
1464                 op = get_irn_link(pos);
1465                 assert(op->is_remat && !op->attr.remat.pre);
1466
1467                 if(op->attr.remat.remat->value == value)
1468                         return (ir_node*)pos;
1469
1470 #if 0
1471         const ir_edge_t *edge;
1472                 foreach_out_edge(pos, edge) {
1473                         ir_node   *proj = get_edge_src_irn(edge);
1474                         assert(is_Proj(proj));
1475                 }
1476 #endif
1477
1478         }
1479
1480         return NULL;
1481 }
1482
1483 static spill_t *
1484 add_to_spill_bb(spill_ilp_t * si, ir_node * bb, ir_node * irn)
1485 {
1486         spill_bb_t  *spill_bb = get_irn_link(bb);
1487         spill_t     *spill,
1488                                  query;
1489         char         buf[256];
1490         int          default_spilled;
1491
1492         query.irn = irn;
1493         spill = set_find(spill_bb->ilp, &query, sizeof(query), HASH_PTR(irn));
1494         if(!spill) {
1495                 double   spill_cost = is_Unknown(irn)?0.0001:opt_cost_spill*execution_frequency(si, bb);
1496
1497                 spill = set_insert(spill_bb->ilp, &query, sizeof(query), HASH_PTR(irn));
1498
1499                 spill->reg_out = ILP_UNDEF;
1500                 spill->reg_in  = ILP_UNDEF;
1501                 spill->mem_in  = ILP_UNDEF;
1502
1503                 ir_snprintf(buf, sizeof(buf), "mem_out_%N_%N", irn, bb);
1504                 spill->mem_out = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 1.0);
1505
1506                 ir_snprintf(buf, sizeof(buf), "spill_%N_%N", irn, bb);
1507                 default_spilled = be_is_live_in(si->lv, bb, irn) || is_Phi(irn);
1508                 spill->spill    = lpp_add_var_default(si->lpp, buf, lpp_binary, spill_cost, !default_spilled);
1509         }
1510
1511         return spill;
1512 }
1513
1514 static void
1515 get_live_end(spill_ilp_t * si, ir_node * bb, pset * live)
1516 {
1517         ir_node        *irn;
1518         int i;
1519
1520         be_lv_foreach(si->lv, bb, be_lv_state_end, i) {
1521                 irn = be_lv_get_irn(si->lv, bb, i);
1522
1523                 if (has_reg_class(si, irn) && !pset_find_ptr(si->all_possible_remats, irn)) {
1524                         pset_insert_ptr(live, irn);
1525                 }
1526         }
1527
1528         irn = sched_last(bb);
1529
1530         /* all values eaten by control flow operations are also live until the end of the block */
1531         sched_foreach_reverse(bb, irn) {
1532                 int  i;
1533
1534                 if(!sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) break;
1535
1536                 for(i=get_irn_arity(irn)-1; i>=0; --i) {
1537                         ir_node *arg = get_irn_n(irn,i);
1538
1539                         if(has_reg_class(si, arg)) {
1540                                 pset_insert_ptr(live, arg);
1541                         }
1542                 }
1543         }
1544 }
1545
1546 /**
1547  *  Inserts ILP-constraints and variables for memory copying before the given position
1548  */
1549 static void
1550 insert_mem_copy_position(spill_ilp_t * si, pset * live, const ir_node * block)
1551 {
1552         const ir_node    *succ;
1553         const ir_edge_t  *edge;
1554         spill_bb_t       *spill_bb = get_irn_link(block);
1555         ir_node          *phi;
1556         int               pos;
1557         ilp_cst_t         cst;
1558         ilp_var_t         copyreg;
1559         char              buf[256];
1560         ir_node          *tmp;
1561
1562
1563         assert(edges_activated(current_ir_graph));
1564
1565         edge = get_block_succ_first(block);
1566         if(!edge) return;
1567
1568         succ = edge->src;
1569         pos = edge->pos;
1570
1571         edge = get_block_succ_next(block, edge);
1572         /* next block can only contain phis, if this is a merge edge */
1573         if(edge) return;
1574
1575         ir_snprintf(buf, sizeof(buf), "copyreg_%N", block);
1576         copyreg = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 1.0);
1577
1578         ir_snprintf(buf, sizeof(buf), "check_copyreg_%N", block);
1579         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, si->n_regs);
1580
1581         pset_foreach(live, tmp) {
1582                 spill_t  *spill;
1583 #if 0
1584                 op_t  *op = get_irn_link(irn);
1585                 lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.ilp, 1.0);
1586 #endif
1587                 spill = set_find_spill(spill_bb->ilp, tmp);
1588                 assert(spill);
1589
1590                 lpp_set_factor_fast(si->lpp, cst, spill->reg_out, 1.0);
1591         }
1592         lpp_set_factor_fast(si->lpp, cst, copyreg, 1.0);
1593
1594         sched_foreach(succ, phi) {
1595                 const ir_node  *to_copy;
1596                 op_t           *to_copy_op;
1597                 spill_t        *to_copy_spill;
1598                 op_t           *phi_op = get_irn_link(phi);
1599                 ilp_var_t       reload = ILP_UNDEF;
1600
1601
1602                 if(!is_Phi(phi)) break;
1603                 if(!has_reg_class(si, phi)) continue;
1604
1605                 to_copy = get_irn_n(phi, pos);
1606
1607                 to_copy_op = get_irn_link(to_copy);
1608
1609                 to_copy_spill = set_find_spill(spill_bb->ilp, to_copy);
1610                 assert(to_copy_spill);
1611
1612                 if(spill_bb->reloads) {
1613                         keyval_t *keyval = set_find_keyval(spill_bb->reloads, to_copy);
1614
1615                         if(keyval) {
1616                                 reload = PTR_TO_INT(keyval->val);
1617                         }
1618                 }
1619
1620                 ir_snprintf(buf, sizeof(buf), "req_copy_%N_%N_%N", block, phi, to_copy);
1621                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
1622
1623                 /* copy - reg_out - reload - remat - live_range <= 0 */
1624                 lpp_set_factor_fast(si->lpp, cst, phi_op->attr.live_range.args.copies[pos], 1.0);
1625                 lpp_set_factor_fast(si->lpp, cst, to_copy_spill->reg_out, -1.0);
1626                 if(reload != ILP_UNDEF) lpp_set_factor_fast(si->lpp, cst, reload, -1.0);
1627                 lpp_set_factor_fast(si->lpp, cst, to_copy_op->attr.live_range.ilp, -1.0);
1628                 foreach_pre_remat(si, block, tmp) {
1629                         op_t     *remat_op = get_irn_link(tmp);
1630                         if(remat_op->attr.remat.remat->value == to_copy) {
1631                                 lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, -1.0);
1632                         }
1633                 }
1634
1635                 ir_snprintf(buf, sizeof(buf), "copyreg_%N_%N_%N", block, phi, to_copy);
1636                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
1637
1638                 /* copy - reg_out - copyreg <= 0 */
1639                 lpp_set_factor_fast(si->lpp, cst, phi_op->attr.live_range.args.copies[pos], 1.0);
1640                 lpp_set_factor_fast(si->lpp, cst, to_copy_spill->reg_out, -1.0);
1641                 lpp_set_factor_fast(si->lpp, cst, copyreg, -1.0);
1642         }
1643 }
1644
1645
1646 /**
1647  * Walk all irg blocks and emit this ILP
1648  */
1649 static void
1650 luke_blockwalker(ir_node * bb, void * data)
1651 {
1652         spill_ilp_t    *si = (spill_ilp_t*)data;
1653         ir_node        *irn;
1654         pset           *live;
1655         char            buf[256];
1656         ilp_cst_t       cst;
1657         spill_bb_t     *spill_bb = get_irn_link(bb);
1658         ir_node        *tmp;
1659         spill_t        *spill;
1660         pset           *defs = pset_new_ptr_default();
1661         const arch_env_t *arch_env = si->chordal_env->birg->main_env->arch_env;
1662
1663
1664         live = pset_new_ptr_default();
1665
1666         /****************************************
1667          *      B A S I C  B L O C K  E N D
1668          ***************************************/
1669
1670
1671         /* init live values at end of block */
1672         get_live_end(si, bb, live);
1673
1674         pset_foreach(live, irn) {
1675                 op_t           *op;
1676                 ilp_var_t       reload = ILP_UNDEF;
1677
1678                 spill = set_find_spill(spill_bb->ilp, irn);
1679                 assert(spill);
1680
1681                 if(spill_bb->reloads) {
1682                         keyval_t *keyval = set_find_keyval(spill_bb->reloads, irn);
1683
1684                         if(keyval) {
1685                                 reload = PTR_TO_INT(keyval->val);
1686                         }
1687                 }
1688
1689                 op = get_irn_link(irn);
1690                 assert(!op->is_remat);
1691
1692                 ir_snprintf(buf, sizeof(buf), "lr_%N_%N", irn, bb);
1693                 op->attr.live_range.ilp = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
1694                 op->attr.live_range.op = bb;
1695
1696                 ir_snprintf(buf, sizeof(buf), "reg_out_%N_%N", bb, irn);
1697                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
1698
1699                 /* reg_out - reload - remat - live_range <= 0 */
1700                 lpp_set_factor_fast(si->lpp, cst, spill->reg_out, 1.0);
1701                 if(reload != ILP_UNDEF) lpp_set_factor_fast(si->lpp, cst, reload, -1.0);
1702                 lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.ilp, -1.0);
1703                 foreach_pre_remat(si, bb, tmp) {
1704                         op_t     *remat_op = get_irn_link(tmp);
1705                         if(remat_op->attr.remat.remat->value == irn) {
1706                                 lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, -1.0);
1707                         }
1708                 }
1709                 /* maybe we should also assure that reg_out >= live_range etc. */
1710         }
1711
1712         if(opt_memcopies)
1713                 insert_mem_copy_position(si, live, bb);
1714
1715         /*
1716          * start new live ranges for values used by remats at end of block
1717          * and assure the remat args are available
1718          */
1719         foreach_pre_remat(si, bb, tmp) {
1720                 op_t     *remat_op = get_irn_link(tmp);
1721                 int       n;
1722
1723                 for (n=get_irn_arity(tmp)-1; n>=0; --n) {
1724                         ir_node        *remat_arg = get_irn_n(tmp, n);
1725                         op_t           *arg_op = get_irn_link(remat_arg);
1726                         ilp_var_t       prev_lr;
1727
1728                         if(!has_reg_class(si, remat_arg)) continue;
1729
1730                         /* if value is becoming live through use by remat */
1731                         if(!pset_find_ptr(live, remat_arg)) {
1732                                 ir_snprintf(buf, sizeof(buf), "lr_%N_end%N", remat_arg, bb);
1733                                 prev_lr = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
1734
1735                                 arg_op->attr.live_range.ilp = prev_lr;
1736                                 arg_op->attr.live_range.op = bb;
1737
1738                                 DBG((si->dbg, LEVEL_4, "  value %+F becoming live through use by remat at end of block %+F\n", remat_arg, tmp));
1739
1740                                 pset_insert_ptr(live, remat_arg);
1741                                 add_to_spill_bb(si, bb, remat_arg);
1742                         }
1743
1744                         /* remat <= live_rang(remat_arg) [ + reload(remat_arg) ] */
1745                         ir_snprintf(buf, sizeof(buf), "req_remat_%N_arg_%N", tmp, remat_arg);
1746                         cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
1747
1748                         lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
1749                         lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, -1.0);
1750
1751                         /* use reload placed for this argument */
1752                         if(spill_bb->reloads) {
1753                                 keyval_t *keyval = set_find_keyval(spill_bb->reloads, remat_arg);
1754
1755                                 if(keyval) {
1756                                         ilp_var_t       reload = PTR_TO_INT(keyval->val);
1757
1758                                         lpp_set_factor_fast(si->lpp, cst, reload, -1.0);
1759                                 }
1760                         }
1761                 }
1762         }
1763         DBG((si->dbg, LEVEL_4, "\t   %d values live at end of block %+F\n", pset_count(live), bb));
1764
1765
1766
1767
1768         /**************************************
1769          *    B A S I C  B L O C K  B O D Y
1770          **************************************/
1771
1772         sched_foreach_reverse_from(sched_block_last_noncf(si, bb), irn) {
1773                 op_t       *op;
1774                 op_t       *tmp_op;
1775                 int         n,
1776                                         u = 0,
1777                                         d = 0;
1778                 ilp_cst_t       check_pre,
1779                                         check_post;
1780                 set        *args;
1781                 pset       *used;
1782                 pset       *remat_defs;
1783                 keyval_t   *keyval;
1784                 ilp_cst_t   one_memoperand;
1785
1786                 /* iterate only until first phi */
1787                 if(is_Phi(irn))
1788                         break;
1789
1790                 op = get_irn_link(irn);
1791                 /* skip remats */
1792                 if(op->is_remat) continue;
1793                 DBG((si->dbg, LEVEL_4, "\t  at node %+F\n", irn));
1794
1795                 /* collect defined values */
1796                 if(has_reg_class(si, irn)) {
1797                         pset_insert_ptr(defs, irn);
1798                 }
1799
1800                 /* skip projs */
1801                 if(is_Proj(irn)) continue;
1802
1803                 /*
1804                  * init set of irn's arguments
1805                  * and all possibly used values around this op
1806                  * and values defined by post remats
1807                  */
1808                 args =       new_set(cmp_keyval, get_irn_arity(irn));
1809                 used =       pset_new_ptr(pset_count(live) + get_irn_arity(irn));
1810                 remat_defs = pset_new_ptr(pset_count(live));
1811
1812                 for (n=get_irn_arity(irn)-1; n>=0; --n) {
1813                         ir_node        *irn_arg = get_irn_n(irn, n);
1814                         if(has_reg_class(si, irn_arg)) {
1815                                 set_insert_keyval(args, irn_arg, (void*)n);
1816                                 pset_insert_ptr(used, irn_arg);
1817                         }
1818                 }
1819                 foreach_post_remat(irn, tmp) {
1820                         op_t    *remat_op = get_irn_link(tmp);
1821
1822                         pset_insert_ptr(remat_defs, remat_op->attr.remat.remat->value);
1823
1824                         for (n=get_irn_arity(tmp)-1; n>=0; --n) {
1825                                 ir_node        *remat_arg = get_irn_n(tmp, n);
1826                                 if(has_reg_class(si, remat_arg)) {
1827                                         pset_insert_ptr(used, remat_arg);
1828                                 }
1829                         }
1830                 }
1831                 foreach_pre_remat(si, irn, tmp) {
1832                         for (n=get_irn_arity(tmp)-1; n>=0; --n) {
1833                                 ir_node        *remat_arg = get_irn_n(tmp, n);
1834                                 if(has_reg_class(si, remat_arg)) {
1835                                         pset_insert_ptr(used, remat_arg);
1836                                 }
1837                         }
1838                 }
1839
1840                 /**********************************
1841                  *   I N  E P I L O G  O F  irn
1842                  **********************************/
1843
1844                 /* ensure each dying value is used by only one post remat */
1845                 pset_foreach(used, tmp) {
1846                         ir_node     *value = tmp;
1847                         op_t        *value_op = get_irn_link(value);
1848                         ir_node     *remat;
1849                         int          n_remats = 0;
1850
1851                         cst = ILP_UNDEF;
1852                         foreach_post_remat(irn, remat) {
1853                                 op_t  *remat_op = get_irn_link(remat);
1854
1855                                 for(n=get_irn_arity(remat)-1; n>=0; --n) {
1856                                         ir_node   *remat_arg = get_irn_n(remat, n);
1857
1858                                         /* if value is used by this remat add it to constraint */
1859                                         if(remat_arg == value) {
1860                                                 if(n_remats == 0) {
1861                                                         /* sum remat2s <= 1 + n_remats*live_range */
1862                                                         ir_snprintf(buf, sizeof(buf), "dying_lr_%N_%N", value, irn);
1863                                                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 1.0);
1864                                                 }
1865
1866                                                 n_remats++;
1867                                                 lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
1868                                                 break;
1869                                         }
1870                                 }
1871                         }
1872
1873             // value_op->attr.live_range.ilp != ILP_UNDEF
1874                         if(pset_find_ptr(live, value) && cst != ILP_UNDEF) {
1875                                 lpp_set_factor_fast(si->lpp, cst, value_op->attr.live_range.ilp, -n_remats);
1876                         }
1877                 }
1878
1879         /* ensure at least one value dies at post remat */
1880         foreach_post_remat(irn, tmp) {
1881             op_t     *remat_op = get_irn_link(tmp);
1882             pset     *remat_args = pset_new_ptr(get_irn_arity(tmp));
1883             ir_node  *remat_arg;
1884
1885             for(n=get_irn_arity(tmp)-1; n>=0; --n) {
1886                 remat_arg = get_irn_n(tmp, n);
1887
1888                 if(has_reg_class(si, remat_arg)) {
1889
1890                     /* does arg always die at this op? */
1891                     if(!pset_find_ptr(live, remat_arg))
1892                         goto skip_one_must_die;
1893
1894                     pset_insert_ptr(remat_args, remat_arg);
1895                 }
1896             }
1897
1898             /* remat + \sum live_range(remat_arg) <= |args| */
1899             ir_snprintf(buf, sizeof(buf), "one_must_die_%+F", tmp);
1900             cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, pset_count(remat_args));
1901             lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
1902
1903             pset_foreach(remat_args, remat_arg) {
1904                 op_t  *arg_op = get_irn_link(remat_arg);
1905
1906                 lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, 1.0);
1907             }
1908
1909 skip_one_must_die:
1910             del_pset(remat_args);
1911         }
1912
1913                 /* new live ranges for values from L\U defined by post remats */
1914                 pset_foreach(live, tmp) {
1915                         ir_node     *value = tmp;
1916                         op_t        *value_op = get_irn_link(value);
1917
1918                         if(!set_find_keyval(args, value) && !pset_find_ptr(defs, value)) {
1919                                 ilp_var_t    prev_lr = ILP_UNDEF;
1920                                 ir_node     *remat;
1921
1922                                 if(pset_find_ptr(remat_defs, value)) {
1923
1924                                         /* next_live_range <= prev_live_range + sum remat2s */
1925                                         ir_snprintf(buf, sizeof(buf), "next_lr_%N_%N", value, irn);
1926                                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
1927
1928                                         ir_snprintf(buf, sizeof(buf), "lr_%N_%N", value, irn);
1929                                         prev_lr = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
1930
1931                                         lpp_set_factor_fast(si->lpp, cst, value_op->attr.live_range.ilp, 1.0);
1932                                         lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
1933
1934                                         foreach_post_remat(irn, remat) {
1935                                                 op_t        *remat_op = get_irn_link(remat);
1936
1937                                                 /* if value is being rematerialized by this remat */
1938                                                 if(value == remat_op->attr.remat.remat->value) {
1939                                                         lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, -1.0);
1940                                                 }
1941                                         }
1942
1943                                         value_op->attr.live_range.ilp = prev_lr;
1944                                         value_op->attr.live_range.op = irn;
1945                                 }
1946                         }
1947                 }
1948
1949                 /* requirements for post remats and start live ranges from L/U' for values dying here */
1950                 foreach_post_remat(irn, tmp) {
1951                         op_t        *remat_op = get_irn_link(tmp);
1952                         int          n;
1953
1954                         for (n=get_irn_arity(tmp)-1; n>=0; --n) {
1955                                 ir_node        *remat_arg = get_irn_n(tmp, n);
1956                                 op_t           *arg_op = get_irn_link(remat_arg);
1957
1958                                 if(!has_reg_class(si, remat_arg)) continue;
1959
1960                                 /* only for values in L\U (TODO and D?), the others are handled with post_use */
1961                                 if(!pset_find_ptr(used, remat_arg)) {
1962                                         /* remat <= live_range(remat_arg) */
1963                                         ir_snprintf(buf, sizeof(buf), "req_remat2_%N_arg_%N", tmp, remat_arg);
1964                                         cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
1965
1966                                         /* if value is becoming live through use by remat2 */
1967                                         if(!pset_find_ptr(live, remat_arg)) {
1968                                                 ilp_var_t     lr;
1969
1970                                                 ir_snprintf(buf, sizeof(buf), "lr_%N_%N", remat_arg, irn);
1971                                                 lr = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
1972
1973                                                 arg_op->attr.live_range.ilp = lr;
1974                                                 arg_op->attr.live_range.op = irn;
1975
1976                                                 DBG((si->dbg, LEVEL_3, "  value %+F becoming live through use by remat2 %+F\n", remat_arg, tmp));
1977
1978                                                 pset_insert_ptr(live, remat_arg);
1979                                                 add_to_spill_bb(si, bb, remat_arg);
1980                                         }
1981
1982                                         lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
1983                                         lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, -1.0);
1984                                 }
1985                         }
1986                 }
1987
1988                 d = pset_count(defs);
1989                 DBG((si->dbg, LEVEL_4, "\t   %+F produces %d values in my register class\n", irn, d));
1990
1991                 /* count how many regs irn needs for arguments */
1992                 u = set_count(args);
1993
1994
1995                 /* check the register pressure in the epilog */
1996                 /* sum_{L\U'} lr + sum_{U'} post_use <= k - |D| */
1997                 ir_snprintf(buf, sizeof(buf), "check_post_%N", irn);
1998                 check_post = lpp_add_cst_uniq(si->lpp, buf, lpp_less, si->n_regs - d);
1999
2000                 /* add L\U' to check_post */
2001                 pset_foreach(live, tmp) {
2002                         if(!pset_find_ptr(used, tmp) && !pset_find_ptr(defs, tmp)) {
2003                                 /* if a live value is not used by irn */
2004                                 tmp_op = get_irn_link(tmp);
2005                                 lpp_set_factor_fast(si->lpp, check_post, tmp_op->attr.live_range.ilp, 1.0);
2006                         }
2007                 }
2008
2009                 /***********************************************************
2010                  *  I T E R A T I O N  O V E R  U S E S  F O R  E P I L O G
2011                  **********************************************************/
2012
2013
2014                 pset_foreach(used, tmp) {
2015                         ilp_var_t       prev_lr;
2016                         ilp_var_t       post_use;
2017                         int             p = 0;
2018                         spill_t        *spill;
2019                         ir_node        *arg = tmp;
2020                         op_t           *arg_op = get_irn_link(arg);
2021                         ir_node        *remat;
2022
2023                         spill = add_to_spill_bb(si, bb, arg);
2024
2025                         /* new live range for each used value */
2026                         ir_snprintf(buf, sizeof(buf), "lr_%N_%N", arg, irn);
2027                         prev_lr = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
2028
2029                         /* the epilog stuff - including post_use, check_post, check_post_remat */
2030                         ir_snprintf(buf, sizeof(buf), "post_use_%N_%N", arg, irn);
2031                         post_use = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
2032
2033                         lpp_set_factor_fast(si->lpp, check_post, post_use, 1.0);
2034
2035                         /* arg is live throughout epilog if the next live_range is in a register */
2036                         if(pset_find_ptr(live, arg)) {
2037                                 DBG((si->dbg, LEVEL_3, "\t  arg %+F is possibly live in epilog of %+F\n", arg, irn));
2038
2039                                 /* post_use >= next_lr + remat */
2040                                 ir_snprintf(buf, sizeof(buf), "post_use_%N_%N-%d", arg, irn, p++);
2041                                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2042                                 lpp_set_factor_fast(si->lpp, cst, post_use, -1.0);
2043                                 lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, 1.0);
2044
2045                         }
2046
2047                         /* if value is not an arg of op and not possibly defined by post remat
2048                          * then it may only die and not become live
2049                          */
2050                         if(!set_find_keyval(args, arg)) {
2051                                 /* post_use <= prev_lr */
2052                                 ir_snprintf(buf, sizeof(buf), "req_post_use_%N_%N", arg, irn);
2053                                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2054                                 lpp_set_factor_fast(si->lpp, cst, post_use, 1.0);
2055                                 lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
2056
2057                                 if(!pset_find_ptr(remat_defs, arg) && pset_find_ptr(live, arg)) {
2058                                         /* next_lr <= prev_lr */
2059                                         ir_snprintf(buf, sizeof(buf), "next_lr_%N_%N", arg, irn);
2060                                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2061                                         lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, 1.0);
2062                                         lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
2063                                 }
2064                         }
2065
2066
2067                         /* forall post remat which use arg add a similar cst */
2068                         foreach_post_remat(irn, remat) {
2069                                 int      n;
2070
2071                                 for (n=get_irn_arity(remat)-1; n>=0; --n) {
2072                                         ir_node    *remat_arg = get_irn_n(remat, n);
2073                                         op_t       *remat_op = get_irn_link(remat);
2074
2075                                         if(remat_arg == arg) {
2076                                                 DBG((si->dbg, LEVEL_3, "\t  found remat with arg %+F in epilog of %+F\n", arg, irn));
2077
2078                                                 ir_snprintf(buf, sizeof(buf), "post_use_%N_%N-%d", arg, irn, p++);
2079                                                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2080                                                 lpp_set_factor_fast(si->lpp, cst, post_use, -1.0);
2081                                                 lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
2082                                         }
2083                                 }
2084                         }
2085
2086                         if(opt_memoperands) {
2087                                 for(n = get_irn_arity(irn)-1; n>=0; --n) {
2088                                         if(get_irn_n(irn, n) == arg && arch_possible_memory_operand(arch_env, irn, n)) {
2089                                                 ilp_var_t       memoperand;
2090
2091                                                 ir_snprintf(buf, sizeof(buf), "memoperand_%N_%d", irn, n);
2092                                                 memoperand = lpp_add_var_default(si->lpp, buf, lpp_binary, opt_cost_memoperand*execution_frequency(si, bb), 0.0);
2093                                                 set_insert_memoperand(si->memoperands, irn, n, memoperand);
2094
2095                                                 ir_snprintf(buf, sizeof(buf), "nolivepost_%N_%d", irn, n);
2096                                                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 1.0);
2097
2098                                                 lpp_set_factor_fast(si->lpp, cst, memoperand, 1.0);
2099                                                 lpp_set_factor_fast(si->lpp, cst, post_use, 1.0);
2100 //                                              if(arg_op->attr.live_range.ilp != ILP_UNDEF)
2101 //                                                      lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, 1.0);
2102                                         }
2103                                 }
2104                         }
2105
2106                         /* new live range begins for each used value */
2107                         arg_op->attr.live_range.ilp = prev_lr;
2108                         arg_op->attr.live_range.op = irn;
2109
2110                         /*if(!pset_find_ptr(live, arg)) {
2111                                 pset_insert_ptr(live, arg);
2112                                 add_to_spill_bb(si, bb, arg);
2113                         }*/
2114                         pset_insert_ptr(live, arg);
2115
2116                 }
2117
2118                 /* just to be sure */
2119                 check_post = ILP_UNDEF;
2120
2121
2122
2123
2124                 /******************
2125                  *   P R O L O G
2126                  ******************/
2127
2128                 /* check the register pressure in the prolog */
2129                 /* sum_{L\U} lr <= k - |U| */
2130                 ir_snprintf(buf, sizeof(buf), "check_pre_%N", irn);
2131                 check_pre = lpp_add_cst_uniq(si->lpp, buf, lpp_less, si->n_regs - u);
2132
2133                 /* for the prolog remove defined values from the live set */
2134                 pset_foreach(defs, tmp) {
2135                         pset_remove_ptr(live, tmp);
2136                 }
2137
2138                 if(opt_memoperands) {
2139                         ir_snprintf(buf, sizeof(buf), "one_memoperand_%N", irn);
2140                         one_memoperand = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 1.0);
2141                 }
2142
2143                 /***********************************************************
2144                  *  I T E R A T I O N  O V E R  A R G S  F O R  P R O L O G
2145                  **********************************************************/
2146
2147
2148                 set_foreach(args, keyval) {
2149                         spill_t          *spill;
2150                         const ir_node    *arg = keyval->key;
2151                         int               i = PTR_TO_INT(keyval->val);
2152                         op_t             *arg_op = get_irn_link(arg);
2153                         ilp_cst_t         requirements;
2154                         int               n_memoperands;
2155
2156                         spill = set_find_spill(spill_bb->ilp, arg);
2157                         assert(spill);
2158
2159                         ir_snprintf(buf, sizeof(buf), "reload_%N_%N", arg, irn);
2160                         op->attr.live_range.args.reloads[i] = lpp_add_var_default(si->lpp, buf, lpp_binary, opt_cost_reload*execution_frequency(si, bb), 1.0);
2161
2162                         /* reload <= mem_out */
2163                         ir_snprintf(buf, sizeof(buf), "req_reload_%N_%N", arg, irn);
2164                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2165                         lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.args.reloads[i], 1.0);
2166                         lpp_set_factor_fast(si->lpp, cst, spill->mem_out, -1.0);
2167
2168                         /* requirement: arg must be in register for use */
2169                         /* reload + remat + live_range == 1 */
2170                         ir_snprintf(buf, sizeof(buf), "req_%N_%N", irn, arg);
2171                         requirements = lpp_add_cst_uniq(si->lpp, buf, lpp_equal, 1.0);
2172
2173                         lpp_set_factor_fast(si->lpp, requirements, arg_op->attr.live_range.ilp, 1.0);
2174                         lpp_set_factor_fast(si->lpp, requirements, op->attr.live_range.args.reloads[i], 1.0);
2175                         foreach_pre_remat(si, irn, tmp) {
2176                                 op_t     *remat_op = get_irn_link(tmp);
2177                                 if(remat_op->attr.remat.remat->value == arg) {
2178                                         lpp_set_factor_fast(si->lpp, requirements, remat_op->attr.remat.ilp, 1.0);
2179                                 }
2180                         }
2181
2182                         if(opt_memoperands) {
2183                                 n_memoperands = 0;
2184                                 for(n = get_irn_arity(irn)-1; n>=0; --n) {
2185                                         if(get_irn_n(irn, n) == arg) {
2186                                                 n_memoperands++;
2187                                         }
2188                                 }
2189                                 for(n = get_irn_arity(irn)-1; n>=0; --n) {
2190                                         if(get_irn_n(irn, n) == arg && arch_possible_memory_operand(arch_env, irn, n)) {
2191                                                 memoperand_t  *memoperand;
2192                                                 memoperand = set_find_memoperand(si->memoperands, irn, n);
2193
2194                                                 /* memoperand <= mem_out */
2195                                                 ir_snprintf(buf, sizeof(buf), "req_memoperand_%N_%d", irn, n);
2196                                                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2197                                                 lpp_set_factor_fast(si->lpp, cst, memoperand->ilp, 1.0);
2198                                                 lpp_set_factor_fast(si->lpp, cst, spill->mem_out, -1.0);
2199
2200                                                 /* the memoperand is only sufficient if it is used once by the op */
2201                                                 if(n_memoperands == 1)
2202                                                         lpp_set_factor_fast(si->lpp, requirements, memoperand->ilp, 1.0);
2203
2204                                                 lpp_set_factor_fast(si->lpp, one_memoperand, memoperand->ilp, 1.0);
2205
2206                                                 /* we have one more free register if we use a memory operand */
2207                                                 lpp_set_factor_fast(si->lpp, check_pre, memoperand->ilp, -1.0);
2208                                         }
2209                                 }
2210                         }
2211                 }
2212
2213                 /* iterate over L\U */
2214                 pset_foreach(live, tmp) {
2215                         if(!set_find_keyval(args, tmp)) {
2216                                 /* if a live value is not used by irn */
2217                                 tmp_op = get_irn_link(tmp);
2218                                 lpp_set_factor_fast(si->lpp, check_pre, tmp_op->attr.live_range.ilp, 1.0);
2219                         }
2220                 }
2221
2222
2223                 /* requirements for remats */
2224                 /* start new live ranges for values used by remats */
2225                 foreach_pre_remat(si, irn, tmp) {
2226                         op_t        *remat_op = get_irn_link(tmp);
2227                         int          n;
2228
2229                         for (n=get_irn_arity(tmp)-1; n>=0; --n) {
2230                                 ir_node        *remat_arg = get_irn_n(tmp, n);
2231                                 op_t           *arg_op = get_irn_link(remat_arg);
2232
2233                                 if(!has_reg_class(si, remat_arg)) continue;
2234
2235                                 /* remat <= live_rang(remat_arg) [ + reload(remat_arg) ] */
2236                                 ir_snprintf(buf, sizeof(buf), "req_remat_%N_arg_%N", tmp, remat_arg);
2237                                 cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
2238
2239                                 lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
2240                                 lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, -1.0);
2241
2242                                 /* if remat arg is also used by current op then we can use reload placed for this argument */
2243                                 if((keyval = set_find_keyval(args, remat_arg)) != NULL) {
2244                                         int    index = (int)keyval->val;
2245
2246                                         lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.args.reloads[index], -1.0);
2247                                 }
2248                         }
2249                 }
2250
2251
2252
2253
2254                 /*************************
2255                  *  D O N E  W I T H  O P
2256                  *************************/
2257
2258                 DBG((si->dbg, LEVEL_4, "\t   %d values live at %+F\n", pset_count(live), irn));
2259
2260                 pset_foreach(live, tmp) {
2261                         assert(has_reg_class(si, tmp));
2262                 }
2263
2264                 for (n=get_irn_arity(irn)-1; n>=0; --n) {
2265                         ir_node        *arg = get_irn_n(irn, n);
2266
2267                         assert(!find_post_remat(arg, irn) && "there should be no post remat for an argument of an op");
2268                 }
2269
2270                 del_pset(remat_defs);
2271                 del_pset(used);
2272                 del_set(args);
2273                 del_pset(defs);
2274                 defs = pset_new_ptr_default();
2275         }
2276
2277
2278
2279         /***************************************
2280          *   B E G I N N I N G  O F  B L O C K
2281          ***************************************/
2282
2283
2284         /* we are now at the beginning of the basic block, there are only \Phis in front of us */
2285         DBG((si->dbg, LEVEL_3, "\t   %d values live at beginning of block %+F\n", pset_count(live), bb));
2286
2287         pset_foreach(live, irn) {
2288                 assert(is_Phi(irn) || get_nodes_block(irn) != bb);
2289         }
2290
2291         /* construct mem_outs for all values */
2292
2293         set_foreach(spill_bb->ilp, spill) {
2294                 ir_snprintf(buf, sizeof(buf), "mem_out_%N_%N", spill->irn, bb);
2295                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2296
2297                 lpp_set_factor_fast(si->lpp, cst, spill->mem_out, 1.0);
2298                 lpp_set_factor_fast(si->lpp, cst, spill->spill, -1.0);
2299
2300                 if(pset_find_ptr(live, spill->irn)) {
2301                         int default_spilled;
2302                         DBG((si->dbg, LEVEL_5, "\t     %+F live at beginning of block %+F\n", spill->irn, bb));
2303
2304                         ir_snprintf(buf, sizeof(buf), "mem_in_%N_%N", spill->irn, bb);
2305                         default_spilled = be_is_live_in(si->lv, bb, spill->irn) || is_Phi(spill->irn);
2306                         spill->mem_in   = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, default_spilled);
2307                         lpp_set_factor_fast(si->lpp, cst, spill->mem_in, -1.0);
2308
2309                         if(is_Phi(spill->irn) && get_nodes_block(spill->irn) == bb) {
2310                                 int   n;
2311                                 op_t *op = get_irn_link(spill->irn);
2312
2313                                 /* do we have to copy a phi argument? */
2314                                 op->attr.live_range.args.copies = obstack_alloc(si->obst, sizeof(*op->attr.live_range.args.copies) * get_irn_arity(spill->irn));
2315                                 memset(op->attr.live_range.args.copies, 0xFF, sizeof(*op->attr.live_range.args.copies) * get_irn_arity(spill->irn));
2316
2317                                 for(n=get_irn_arity(spill->irn)-1; n>=0; --n) {
2318                                         const ir_node  *arg = get_irn_n(spill->irn, n);
2319                                         double          freq=0.0;
2320                                         int             m;
2321                                         ilp_var_t       var;
2322
2323
2324                                         /* argument already done? */
2325                                         if(op->attr.live_range.args.copies[n] != ILP_UNDEF) continue;
2326
2327                                         /* get sum of execution frequencies of blocks with the same phi argument */
2328                                         for(m=n; m>=0; --m) {
2329                                                 const ir_node  *arg2 = get_irn_n(spill->irn, m);
2330
2331                                                 if(arg==arg2) {
2332                                                         freq += execution_frequency(si, get_Block_cfgpred_block(bb, m));
2333                                                 }
2334                                         }
2335
2336                                         /* copies are not for free */
2337                                         ir_snprintf(buf, sizeof(buf), "copy_%N_%N", arg, spill->irn);
2338                                         var = lpp_add_var_default(si->lpp, buf, lpp_binary, opt_cost_spill * freq, 1.0);
2339
2340                                         for(m=n; m>=0; --m) {
2341                                                 const ir_node  *arg2 = get_irn_n(spill->irn, m);
2342
2343                                                 if(arg==arg2) {
2344                                                         op->attr.live_range.args.copies[m] = var;
2345                                                 }
2346                                         }
2347
2348 #if 0
2349                                         /* copy <= mem_in */
2350                                         ir_snprintf(buf, sizeof(buf), "nocopy_%N_%N", arg, spill->irn);
2351                                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2352                                         lpp_set_factor_fast(si->lpp, cst, var, 1.0);
2353                                         lpp_set_factor_fast(si->lpp, cst, spill->mem_in, -1.0);
2354 #endif
2355                                 }
2356                         }
2357                 }
2358         }
2359
2360
2361         /* L\U is empty at bb start */
2362         /* arg is live throughout epilog if it is reg_in into this block */
2363
2364         /* check the register pressure at the beginning of the block
2365          * including remats
2366          */
2367         ir_snprintf(buf, sizeof(buf), "check_start_%N", bb);
2368         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, si->n_regs);
2369
2370         pset_foreach(live, irn) {
2371         ilp_cst_t  nospill;
2372
2373                 spill = set_find_spill(spill_bb->ilp, irn);
2374                 assert(spill);
2375
2376                 ir_snprintf(buf, sizeof(buf), "reg_in_%N_%N", irn, bb);
2377                 spill->reg_in = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 0.0);
2378
2379                 lpp_set_factor_fast(si->lpp, cst, spill->reg_in, 1.0);
2380
2381                 /* spill + mem_in <= 1 */
2382                 ir_snprintf(buf, sizeof(buf), "nospill_%N_%N", irn, bb);
2383                 nospill = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 1);
2384
2385                 lpp_set_factor_fast(si->lpp, nospill, spill->mem_in, 1.0);
2386                 lpp_set_factor_fast(si->lpp, nospill, spill->spill, 1.0);
2387
2388         }
2389         foreach_post_remat(bb, irn) {
2390                 op_t     *remat_op = get_irn_link(irn);
2391
2392                 DBG((si->dbg, LEVEL_4, "\t  next post remat: %+F\n", irn));
2393                 assert(remat_op->is_remat && !remat_op->attr.remat.pre);
2394
2395                 lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
2396         }
2397
2398         /* forall post remats add requirements */
2399         foreach_post_remat(bb, tmp) {
2400                 int         n;
2401
2402                 for (n=get_irn_arity(tmp)-1; n>=0; --n) {
2403                         ir_node    *remat_arg = get_irn_n(tmp, n);
2404                         op_t       *remat_op = get_irn_link(tmp);
2405
2406                         if(!has_reg_class(si, remat_arg)) continue;
2407
2408                         spill = set_find_spill(spill_bb->ilp, remat_arg);
2409                         assert(spill);
2410
2411                         /* remat <= reg_in_argument */
2412                         ir_snprintf(buf, sizeof(buf), "req_remat2_%N_%N_arg_%N", tmp, bb, remat_arg);
2413                         cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
2414                         lpp_set_factor_fast(si->lpp, cst, spill->reg_in, -1.0);
2415                         lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
2416                 }
2417         }
2418
2419         /* mem_in/reg_in for live_in values, especially phis and their arguments */
2420         pset_foreach(live, irn) {
2421                 int          p = 0,
2422                                          n;
2423
2424                 spill = set_find_spill(spill_bb->ilp, irn);
2425                 assert(spill && spill->irn == irn);
2426
2427                 if(is_Phi(irn) && get_nodes_block(irn) == bb) {
2428                         for (n=get_Phi_n_preds(irn)-1; n>=0; --n) {
2429                                 ilp_cst_t       mem_in,
2430                                                                 reg_in;
2431                                 ir_node        *phi_arg = get_Phi_pred(irn, n);
2432                                 ir_node        *bb_p = get_Block_cfgpred_block(bb, n);
2433                                 spill_bb_t     *spill_bb_p = get_irn_link(bb_p);
2434                                 spill_t        *spill_p;
2435                                 op_t           *op = get_irn_link(irn);
2436
2437                                 /* although the phi is in the right regclass one or more of
2438                                  * its arguments can be in a different one or at least to
2439                                  * ignore
2440                                  */
2441                                 if(has_reg_class(si, phi_arg)) {
2442                                         /* mem_in < mem_out_arg + copy */
2443                                         ir_snprintf(buf, sizeof(buf), "mem_in_%N_%N-%d", irn, bb, p);
2444                                         mem_in = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2445
2446                                         /* reg_in < reg_out_arg */
2447                                         ir_snprintf(buf, sizeof(buf), "reg_in_%N_%N-%d", irn, bb, p++);
2448                                         reg_in = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2449
2450                                         lpp_set_factor_fast(si->lpp, mem_in, spill->mem_in, 1.0);
2451                                         lpp_set_factor_fast(si->lpp, reg_in, spill->reg_in, 1.0);
2452
2453                                         spill_p = set_find_spill(spill_bb_p->ilp, phi_arg);
2454                                         assert(spill_p);
2455
2456                                         lpp_set_factor_fast(si->lpp, mem_in, spill_p->mem_out, -1.0);
2457                                         lpp_set_factor_fast(si->lpp, mem_in, op->attr.live_range.args.copies[n], -1.0);
2458                                         lpp_set_factor_fast(si->lpp, reg_in, spill_p->reg_out, -1.0);
2459                                 }
2460                         }
2461                 } else {
2462                         /* else assure the value arrives on all paths in the same resource */
2463
2464                         for (n=get_Block_n_cfgpreds(bb)-1; n>=0; --n) {
2465                                 ilp_cst_t       mem_in,
2466                                                                 reg_in;
2467                                 ir_node        *bb_p = get_Block_cfgpred_block(bb, n);
2468                                 spill_bb_t     *spill_bb_p = get_irn_link(bb_p);
2469                                 spill_t        *spill_p;
2470
2471                                 ir_snprintf(buf, sizeof(buf), "mem_in_%N_%N-%d", irn, bb, p);
2472                                 mem_in = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2473                                 ir_snprintf(buf, sizeof(buf), "reg_in_%N_%N-%d", irn, bb, p++);
2474                                 reg_in = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2475
2476                                 lpp_set_factor_fast(si->lpp, mem_in, spill->mem_in, 1.0);
2477                                 lpp_set_factor_fast(si->lpp, reg_in, spill->reg_in, 1.0);
2478
2479                                 spill_p = set_find_spill(spill_bb_p->ilp, irn);
2480                                 assert(spill_p);
2481
2482                                 lpp_set_factor_fast(si->lpp, mem_in, spill_p->mem_out, -1.0);
2483                                 lpp_set_factor_fast(si->lpp, reg_in, spill_p->reg_out, -1.0);
2484                         }
2485                 }
2486         }
2487
2488         /* first live ranges from reg_ins */
2489         pset_foreach(live, irn) {
2490                 op_t      *op = get_irn_link(irn);
2491
2492                 spill = set_find_spill(spill_bb->ilp, irn);
2493                 assert(spill && spill->irn == irn);
2494
2495                 ir_snprintf(buf, sizeof(buf), "first_lr_%N_%N", irn, bb);
2496                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2497                 lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.ilp, 1.0);
2498                 lpp_set_factor_fast(si->lpp, cst, spill->reg_in, -1.0);
2499
2500                 foreach_post_remat(bb, tmp) {
2501                         op_t     *remat_op = get_irn_link(tmp);
2502
2503                         if(remat_op->attr.remat.remat->value == irn) {
2504                                 lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, -1.0);
2505                         }
2506                 }
2507         }
2508
2509         /* walk forward now and compute constraints for placing spills */
2510         /* this must only be done for values that are not defined in this block */
2511         /* TODO are these values at start of block? if yes, just check whether this is a diverge edge and skip the loop */
2512         pset_foreach(live, irn) {
2513                 /*
2514                  * if value is defined in this block we can anways place the spill directly after the def
2515                  *    -> no constraint necessary
2516                  */
2517                 if(!is_Phi(irn) && get_nodes_block(irn) == bb) continue;
2518
2519
2520                 spill = set_find_spill(spill_bb->ilp, irn);
2521                 assert(spill);
2522
2523                 ir_snprintf(buf, sizeof(buf), "req_spill_%N_%N", irn, bb);
2524                 cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0.0);
2525
2526                 lpp_set_factor_fast(si->lpp, cst, spill->spill, 1.0);
2527                 if(is_diverge_edge(bb)) lpp_set_factor_fast(si->lpp, cst, spill->reg_in, -1.0);
2528
2529                 if(!is_Phi(irn)) {
2530                         sched_foreach_op(bb, tmp) {
2531                                 op_t   *op = get_irn_link(tmp);
2532
2533                                 if(is_Phi(tmp)) continue;
2534                                 assert(!is_Proj(tmp));
2535
2536                                 if(op->is_remat) {
2537                                         const ir_node   *value = op->attr.remat.remat->value;
2538
2539                                         if(value == irn) {
2540                                                 /* only collect remats up to the first real use of a value */
2541                                                 lpp_set_factor_fast(si->lpp, cst, op->attr.remat.ilp, -1.0);
2542                                         }
2543                                 } else {
2544                                         int   n;
2545
2546                                         for (n=get_irn_arity(tmp)-1; n>=0; --n) {
2547                                                 ir_node    *arg = get_irn_n(tmp, n);
2548
2549                                                 if(arg == irn) {
2550                                                         /* if a value is used stop collecting remats */
2551                             goto next_live;
2552                                                 }
2553                                         }
2554                                 }
2555                         }
2556                 }
2557 next_live: ;
2558         }
2559
2560         del_pset(live);
2561 }
2562
2563 typedef struct _irnlist_t {
2564         struct list_head   list;
2565         ir_node           *irn;
2566 } irnlist_t;
2567
2568 typedef struct _interference_t {
2569         struct list_head    blocklist;
2570         ir_node            *a;
2571         ir_node            *b;
2572 } interference_t;
2573
2574 static int
2575 cmp_interference(const void *a, const void *b, size_t size)
2576 {
2577         const interference_t *p = a;
2578         const interference_t *q = b;
2579
2580         return !(p->a == q->a && p->b == q->b);
2581 }
2582
2583 static interference_t *
2584 set_find_interference(set * set, ir_node * a, ir_node * b)
2585 {
2586         interference_t     query;
2587
2588         query.a = (a>b)?a:b;
2589         query.b = (a>b)?b:a;
2590
2591         return set_find(set, &query, sizeof(query), HASH_PTR(PTR_TO_INT(a) ^ PTR_TO_INT(b)));
2592 }
2593
2594 static interference_t *
2595 set_insert_interference(spill_ilp_t * si, set * set, ir_node * a, ir_node * b, ir_node * bb)
2596 {
2597         interference_t     query,
2598                                           *result;
2599         irnlist_t         *list = obstack_alloc(si->obst, sizeof(*list));
2600
2601         list->irn = bb;
2602
2603         result = set_find_interference(set, a, b);
2604         if(result) {
2605
2606                 list_add(&list->list, &result->blocklist);
2607                 return result;
2608         }
2609
2610         query.a = (a>b)?a:b;
2611         query.b = (a>b)?b:a;
2612
2613         result = set_insert(set, &query, sizeof(query), HASH_PTR(PTR_TO_INT(a) ^ PTR_TO_INT(b)));
2614
2615         INIT_LIST_HEAD(&result->blocklist);
2616         list_add(&list->list, &result->blocklist);
2617
2618         return result;
2619 }
2620
2621 static int
2622 values_interfere_in_block(const spill_ilp_t * si, const ir_node * bb, const ir_node * a, const ir_node * b)
2623 {
2624         const ir_edge_t *edge;
2625
2626         if(get_nodes_block(a) != bb && get_nodes_block(b) != bb) {
2627                 /* both values are live in, so they interfere */
2628                 return 1;
2629         }
2630
2631         /* ensure a dominates b */
2632         if(value_dominates(b,a)) {
2633                 const ir_node * t;
2634                 t = b;
2635                 b = a;
2636                 a = t;
2637         }
2638         assert(get_nodes_block(b) == bb && "at least b should be defined here in this block");
2639
2640
2641         /* the following code is stolen from bera.c */
2642         if(be_is_live_end(si->lv, bb, a))
2643                 return 1;
2644
2645         foreach_out_edge(a, edge) {
2646                 const ir_node *user = edge->src;
2647                 if(get_nodes_block(user) == bb
2648                                 && !is_Phi(user)
2649                                 && b != user
2650                                 && value_dominates(b, user))
2651                         return 1;
2652         }
2653
2654         return 0;
2655 }
2656
2657 /**
2658  * Walk all irg blocks and collect interfering values inside of phi classes
2659  */
2660 static void
2661 luke_interferencewalker(ir_node * bb, void * data)
2662 {
2663         spill_ilp_t    *si = (spill_ilp_t*)data;
2664         int             l1, l2;
2665
2666         be_lv_foreach(si->lv, bb, be_lv_state_end | be_lv_state_out | be_lv_state_in, l1) {
2667                 ir_node        *a = be_lv_get_irn(si->lv, bb, l1);
2668                 op_t           *a_op = get_irn_link(a);
2669
2670
2671                 /* a is only interesting if it is in my register class and if it is inside a phi class */
2672                 if (has_reg_class(si, a) && get_phi_class(a)) {
2673                         if(a_op->is_remat)
2674                                 continue;
2675
2676                         for(l2=_be_lv_next_irn(si->lv, bb, 0xff, l1+1); l2>=0; l2=_be_lv_next_irn(si->lv, bb, 0xff, l2+1)) {
2677                                 ir_node        *b = be_lv_get_irn(si->lv, bb, l2);
2678                                 op_t           *b_op = get_irn_link(b);
2679
2680
2681                                 /* a and b are only interesting if they are in the same phi class */
2682                                 if(has_reg_class(si, b) && get_phi_class(a) == get_phi_class(b)) {
2683                                         if(b_op->is_remat)
2684                                                 continue;
2685
2686                                         if(values_interfere_in_block(si, bb, a, b)) {
2687                                                 DBG((si->dbg, LEVEL_4, "\tvalues interfere in %+F: %+F, %+F\n", bb, a, b));
2688                                                 set_insert_interference(si, si->interferences, a, b, bb);
2689                                         }
2690                                 }
2691                         }
2692                 }
2693         }
2694 }
2695
2696 static unsigned int copy_path_id = 0;
2697
2698 static void
2699 write_copy_path_cst(spill_ilp_t *si, pset * copies, ilp_var_t any_interfere)
2700 {
2701         ilp_cst_t  cst;
2702         ilp_var_t  copy;
2703         char       buf[256];
2704         void      *ptr;
2705
2706         ir_snprintf(buf, sizeof(buf), "copy_path-%d", copy_path_id++);
2707         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0);
2708
2709         lpp_set_factor_fast(si->lpp, cst, any_interfere, 1.0);
2710
2711         pset_foreach(copies, ptr) {
2712                 copy = PTR_TO_INT(ptr);
2713                 lpp_set_factor_fast(si->lpp, cst, copy, -1.0);
2714         }
2715 }
2716
2717 /**
2718  * @parameter copies   contains a path of copies which lead us to irn
2719  * @parameter visited  contains a set of nodes already visited on this path
2720  */
2721 static int
2722 find_copy_path(spill_ilp_t * si, const ir_node * irn, const ir_node * target, ilp_var_t any_interfere, pset * copies, pset * visited)
2723 {
2724         const ir_edge_t *edge;
2725         op_t            *op = get_irn_link(irn);
2726     pset            *visited_users = pset_new_ptr_default();
2727         int              paths = 0;
2728
2729         if(op->is_remat) return 0;
2730
2731         pset_insert_ptr(visited, irn);
2732
2733         if(is_Phi(irn)) {
2734                 int    n;
2735         pset  *visited_operands = pset_new_ptr(get_irn_arity(irn));
2736
2737                 /* visit all operands */
2738                 for(n=get_irn_arity(irn)-1; n>=0; --n) {
2739                         ir_node  *arg = get_irn_n(irn, n);
2740                         ilp_var_t  copy = op->attr.live_range.args.copies[n];
2741
2742                         if(!has_reg_class(si, arg)) continue;
2743             if(pset_find_ptr(visited_operands, arg)) continue;
2744             pset_insert_ptr(visited_operands, arg);
2745
2746                         if(arg == target) {
2747                                 if(++paths > MAX_PATHS && pset_count(copies) != 0) {
2748                                         del_pset(visited_operands);
2749                                         del_pset(visited_users);
2750                                         pset_remove_ptr(visited, irn);
2751                                         return paths;
2752                                 }
2753                                 pset_insert(copies, INT_TO_PTR(copy), copy);
2754                                 write_copy_path_cst(si, copies, any_interfere);
2755                                 pset_remove(copies, INT_TO_PTR(copy), copy);
2756                         } else if(!pset_find_ptr(visited, arg)) {
2757                                 pset_insert(copies, INT_TO_PTR(copy), copy);
2758                                 paths += find_copy_path(si, arg, target, any_interfere, copies, visited);
2759                                 pset_remove(copies, INT_TO_PTR(copy), copy);
2760
2761                 /*if(paths > MAX_PATHS) {
2762                     if(pset_count(copies) == 0) {
2763                         ilp_cst_t  cst;
2764                         char       buf[256];
2765
2766                         ir_snprintf(buf, sizeof(buf), "always_copy-%d-%d", any_interfere, copy);
2767                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_equal, 0);
2768                         lpp_set_factor_fast(si->lpp, cst, any_interfere, -1.0);
2769                         lpp_set_factor_fast(si->lpp, cst, copy, 1.0);
2770                         DBG((si->dbg, LEVEL_1, "ALWAYS COPYING %d FOR INTERFERENCE %d\n", copy, any_interfere));
2771
2772                         paths = 0;
2773                     } else {
2774                         del_pset(visited_operands);
2775                         del_pset(visited_users);
2776                         pset_remove_ptr(visited, irn);
2777                         return paths;
2778                     }
2779                 } else if(pset_count(copies) == 0) {
2780                                         paths = 0;
2781                                 }*/
2782                         }
2783                 }
2784
2785         del_pset(visited_operands);
2786         }
2787
2788         /* visit all uses which are phis */
2789         foreach_out_edge(irn, edge) {
2790                 ir_node  *user = edge->src;
2791                 int       pos  = edge->pos;
2792                 op_t     *op = get_irn_link(user);
2793                 ilp_var_t copy;
2794
2795                 if(!is_Phi(user)) continue;
2796                 if(!has_reg_class(si, user)) continue;
2797         if(pset_find_ptr(visited_users, user)) continue;
2798         pset_insert_ptr(visited_users, user);
2799
2800                 copy = op->attr.live_range.args.copies[pos];
2801
2802                 if(user == target) {
2803                         if(++paths > MAX_PATHS && pset_count(copies) != 0) {
2804                                 del_pset(visited_users);
2805                                 pset_remove_ptr(visited, irn);
2806                                 return paths;
2807                         }
2808                         pset_insert(copies, INT_TO_PTR(copy), copy);
2809                         write_copy_path_cst(si, copies, any_interfere);
2810                         pset_remove(copies, INT_TO_PTR(copy), copy);
2811                 } else if(!pset_find_ptr(visited, user)) {
2812                         pset_insert(copies, INT_TO_PTR(copy), copy);
2813                         paths += find_copy_path(si, user, target, any_interfere, copies, visited);
2814                         pset_remove(copies, INT_TO_PTR(copy), copy);
2815
2816             /*if(paths > MAX_PATHS) {
2817                 if(pset_count(copies) == 0) {
2818                     ilp_cst_t  cst;
2819                     char       buf[256];
2820
2821                     ir_snprintf(buf, sizeof(buf), "always_copy-%d-%d", any_interfere, copy);
2822                     cst = lpp_add_cst_uniq(si->lpp, buf, lpp_equal, 0);
2823                     lpp_set_factor_fast(si->lpp, cst, any_interfere, -1.0);
2824                     lpp_set_factor_fast(si->lpp, cst, copy, 1.0);
2825                     DBG((si->dbg, LEVEL_1, "ALWAYS COPYING %d FOR INTERFERENCE %d\n", copy, any_interfere));
2826
2827                     paths = 0;
2828                 } else {
2829                     del_pset(visited_users);
2830                     pset_remove_ptr(visited, irn);
2831                     return paths;
2832                 }
2833             } else if(pset_count(copies) == 0) {
2834                                 paths = 0;
2835                         }*/
2836                 }
2837         }
2838
2839     del_pset(visited_users);
2840         pset_remove_ptr(visited, irn);
2841         return paths;
2842 }
2843
2844 static void
2845 gen_copy_constraints(spill_ilp_t * si, const ir_node * a, const ir_node * b, ilp_var_t any_interfere)
2846 {
2847         pset * copies = pset_new_ptr_default();
2848         pset * visited = pset_new_ptr_default();
2849
2850         find_copy_path(si, a, b, any_interfere, copies, visited);
2851
2852         del_pset(visited);
2853         del_pset(copies);
2854 }
2855
2856
2857 static void
2858 memcopyhandler(spill_ilp_t * si)
2859 {
2860         interference_t   *interference;
2861         char              buf[256];
2862         /* teste Speicherwerte auf Interferenz */
2863
2864         /* analyze phi classes */
2865         phi_class_compute(si->chordal_env->irg);
2866
2867         DBG((si->dbg, LEVEL_2, "\t calling interferencewalker\n"));
2868         irg_block_walk_graph(si->chordal_env->irg, luke_interferencewalker, NULL, si);
2869
2870         /* now lets emit the ILP unequations for the crap */
2871         set_foreach(si->interferences, interference) {
2872                 irnlist_t      *irnlist;
2873                 ilp_var_t       interfere,
2874                                                 any_interfere;
2875                 ilp_cst_t       any_interfere_cst,
2876                                                 cst;
2877                 const ir_node  *a  = interference->a;
2878                 const ir_node  *b  = interference->b;
2879
2880                 /* any_interf <= \sum interf */
2881                 ir_snprintf(buf, sizeof(buf), "interfere_%N_%N", a, b);
2882                 any_interfere_cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0);
2883                 any_interfere = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 1.0);
2884
2885                 lpp_set_factor_fast(si->lpp, any_interfere_cst, any_interfere, 1.0);
2886
2887                 list_for_each_entry(irnlist_t, irnlist, &interference->blocklist, list) {
2888                         const ir_node  *bb = irnlist->irn;
2889                         spill_bb_t     *spill_bb = get_irn_link(bb);
2890                         spill_t        *spilla,
2891                                                    *spillb;
2892                         char           buf[256];
2893
2894                         spilla = set_find_spill(spill_bb->ilp, a);
2895                         assert(spilla);
2896
2897                         spillb = set_find_spill(spill_bb->ilp, b);
2898                         assert(spillb);
2899
2900                         /* interfere <-> (mem_in_a or spill_a) and (mem_in_b or spill_b): */
2901                         /* 1:   mem_in_a + mem_in_b + spill_a + spill_b - interfere <= 1 */
2902                         /* 2: - mem_in_a - spill_a + interfere <= 0 */
2903                         /* 3: - mem_in_b - spill_b + interfere <= 0 */
2904                         ir_snprintf(buf, sizeof(buf), "interfere_%N_%N_%N", bb, a, b);
2905                         interfere = lpp_add_var_default(si->lpp, buf, lpp_binary, 0.0, 1.0);
2906
2907                         ir_snprintf(buf, sizeof(buf), "interfere_%N_%N_%N-1", bb, a, b);
2908                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 1);
2909
2910                         lpp_set_factor_fast(si->lpp, cst, interfere, -1.0);
2911                         if(spilla->mem_in != ILP_UNDEF) lpp_set_factor_fast(si->lpp, cst, spilla->mem_in, 1.0);
2912                         lpp_set_factor_fast(si->lpp, cst, spilla->spill, 1.0);
2913                         if(spillb->mem_in != ILP_UNDEF) lpp_set_factor_fast(si->lpp, cst, spillb->mem_in, 1.0);
2914                         lpp_set_factor_fast(si->lpp, cst, spillb->spill, 1.0);
2915
2916                         ir_snprintf(buf, sizeof(buf), "interfere_%N_%N_%N-2", bb, a, b);
2917                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0);
2918
2919                         lpp_set_factor_fast(si->lpp, cst, interfere, 1.0);
2920                         if(spilla->mem_in != ILP_UNDEF) lpp_set_factor_fast(si->lpp, cst, spilla->mem_in, -1.0);
2921                         lpp_set_factor_fast(si->lpp, cst, spilla->spill, -1.0);
2922
2923                         ir_snprintf(buf, sizeof(buf), "interfere_%N_%N_%N-3", bb, a, b);
2924                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0);
2925
2926                         lpp_set_factor_fast(si->lpp, cst, interfere, 1.0);
2927                         if(spillb->mem_in != ILP_UNDEF) lpp_set_factor_fast(si->lpp, cst, spillb->mem_in, -1.0);
2928                         lpp_set_factor_fast(si->lpp, cst, spillb->spill, -1.0);
2929
2930
2931                         lpp_set_factor_fast(si->lpp, any_interfere_cst, interfere, -1.0);
2932
2933                         /* any_interfere >= interf */
2934                         ir_snprintf(buf, sizeof(buf), "interfere_%N_%N-%N", a, b, bb);
2935                         cst = lpp_add_cst_uniq(si->lpp, buf, lpp_less, 0);
2936
2937                         lpp_set_factor_fast(si->lpp, cst, interfere, 1.0);
2938                         lpp_set_factor_fast(si->lpp, cst, any_interfere, -1.0);
2939                 }
2940
2941                 /* now that we know whether the two values interfere in memory we can drop constraints to enforce copies */
2942                 gen_copy_constraints(si,a,b,any_interfere);
2943         }
2944 }
2945
2946
2947 static INLINE int
2948 is_zero(double x)
2949 {
2950         return fabs(x) < 0.00001;
2951 }
2952
2953 static int mark_remat_nodes_hook(FILE *F, ir_node *n, ir_node *l)
2954 {
2955         spill_ilp_t *si = get_irg_link(current_ir_graph);
2956
2957         if(pset_find_ptr(si->all_possible_remats, n)) {
2958                 op_t   *op = (op_t*)get_irn_link(n);
2959                 assert(op && op->is_remat);
2960
2961                 if(!op->attr.remat.remat->inverse) {
2962                         if(op->attr.remat.pre) {
2963                                 ir_fprintf(F, "color:red info3:\"remat value: %+F\"", op->attr.remat.remat->value);
2964                         } else {
2965                                 ir_fprintf(F, "color:orange info3:\"remat2 value: %+F\"", op->attr.remat.remat->value);
2966                         }
2967
2968                         return 1;
2969                 } else {
2970                         op_t   *op = (op_t*)get_irn_link(n);
2971                         assert(op && op->is_remat);
2972
2973                         if(op->attr.remat.pre) {
2974                                 ir_fprintf(F, "color:cyan info3:\"remat inverse value: %+F\"", op->attr.remat.remat->value);
2975                         } else {
2976                                 ir_fprintf(F, "color:lightcyan info3:\"remat2 inverse value: %+F\"", op->attr.remat.remat->value);
2977                         }
2978
2979                         return 1;
2980                 }
2981         }
2982
2983         return 0;
2984 }
2985
2986 static void
2987 dump_graph_with_remats(ir_graph * irg, const char * suffix)
2988 {
2989         set_dump_node_vcgattr_hook(mark_remat_nodes_hook);
2990         be_dump(irg, suffix, dump_ir_block_graph_sched);
2991         set_dump_node_vcgattr_hook(NULL);
2992 }
2993
2994 /**
2995  * Edge hook to dump the schedule edges with annotated register pressure.
2996  */
2997 static int
2998 sched_pressure_edge_hook(FILE *F, ir_node *irn)
2999 {
3000         if(sched_is_scheduled(irn) && sched_has_prev(irn)) {
3001                 ir_node *prev = sched_prev(irn);
3002                 fprintf(F, "edge:{sourcename:\"");
3003                 PRINT_NODEID(irn);
3004                 fprintf(F, "\" targetname:\"");
3005                 PRINT_NODEID(prev);
3006                 fprintf(F, "\" label:\"%d", (int)get_irn_link(irn));
3007                 fprintf(F, "\" color:magenta}\n");
3008         }
3009         return 1;
3010 }
3011
3012 static void
3013 dump_ir_block_graph_sched_pressure(ir_graph *irg, const char *suffix)
3014 {
3015         DUMP_NODE_EDGE_FUNC old_edge_hook = get_dump_node_edge_hook();
3016
3017         dump_consts_local(0);
3018         set_dump_node_edge_hook(sched_pressure_edge_hook);
3019         dump_ir_block_graph(irg, suffix);
3020         set_dump_node_edge_hook(old_edge_hook);
3021 }
3022
3023 static void
3024 walker_pressure_annotator(ir_node * bb, void * data)
3025 {
3026         spill_ilp_t  *si = data;
3027         ir_node      *irn;
3028         int           n, i;
3029         pset         *live = pset_new_ptr_default();
3030         int           projs = 0;
3031
3032         be_lv_foreach(si->lv, bb, be_lv_state_end, i) {
3033                 irn = be_lv_get_irn(si->lv, bb, i);
3034
3035                 if (has_reg_class(si, irn)) {
3036                         pset_insert_ptr(live, irn);
3037                 }
3038         }
3039
3040         set_irn_link(bb, INT_TO_PTR(pset_count(live)));
3041
3042         sched_foreach_reverse(bb, irn) {
3043                 if(is_Phi(irn)) {
3044                         set_irn_link(irn, INT_TO_PTR(pset_count(live)));
3045                         continue;
3046                 }
3047
3048                 if(has_reg_class(si, irn)) {
3049                         pset_remove_ptr(live, irn);
3050                         if(is_Proj(irn)) ++projs;
3051                 }
3052
3053                 if(!is_Proj(irn)) projs = 0;
3054
3055                 for (n=get_irn_arity(irn)-1; n>=0; --n) {
3056                         ir_node    *arg = get_irn_n(irn, n);
3057
3058                         if(has_reg_class(si, arg)) pset_insert_ptr(live, arg);
3059                 }
3060                 set_irn_link(irn, INT_TO_PTR(pset_count(live)+projs));
3061         }
3062
3063         del_pset(live);
3064 }
3065
3066 static void
3067 dump_pressure_graph(spill_ilp_t * si, const char *suffix)
3068 {
3069         be_dump(si->chordal_env->irg, suffix, dump_ir_block_graph_sched_pressure);
3070 }
3071
3072 static void
3073 connect_all_remats_with_keep(spill_ilp_t * si)
3074 {
3075         ir_node   *irn;
3076         ir_node  **ins,
3077                          **pos;
3078         int        n_remats;
3079
3080
3081         n_remats = pset_count(si->all_possible_remats);
3082         if(n_remats) {
3083                 ins = obstack_alloc(si->obst, n_remats * sizeof(*ins));
3084
3085                 pos = ins;
3086                 pset_foreach(si->all_possible_remats, irn) {
3087                         *pos = irn;
3088                         ++pos;
3089                 }
3090
3091                 si->keep = be_new_Keep(si->chordal_env->cls, si->chordal_env->irg, get_irg_end_block(si->chordal_env->irg), n_remats, ins);
3092
3093                 obstack_free(si->obst, ins);
3094         }
3095 }
3096
3097 static void
3098 connect_all_spills_with_keep(spill_ilp_t * si)
3099 {
3100         ir_node   *irn;
3101         ir_node  **ins,
3102                          **pos;
3103         int        n_spills;
3104         ir_node   *keep;
3105
3106
3107         n_spills = pset_count(si->spills);
3108         if(n_spills) {
3109                 ins = obstack_alloc(si->obst, n_spills * sizeof(*ins));
3110
3111                 pos = ins;
3112                 pset_foreach(si->spills, irn) {
3113                         *pos = irn;
3114                         ++pos;
3115                 }
3116
3117                 keep = be_new_Keep(si->chordal_env->cls, si->chordal_env->irg, get_irg_end_block(si->chordal_env->irg), n_spills, ins);
3118
3119                 obstack_free(si->obst, ins);
3120         }
3121 }
3122
3123 /** insert a spill at an arbitrary position */
3124 ir_node *be_spill2(const arch_env_t *arch_env, ir_node *irn, ir_node *insert)
3125 {
3126         ir_node *bl     = is_Block(insert)?insert:get_nodes_block(insert);
3127         ir_graph *irg   = get_irn_irg(bl);
3128         ir_node *frame  = get_irg_frame(irg);
3129         ir_node *spill;
3130         ir_node *next;
3131
3132         const arch_register_class_t *cls       = arch_get_irn_reg_class(arch_env, irn, -1);
3133         const arch_register_class_t *cls_frame = arch_get_irn_reg_class(arch_env, frame, -1);
3134
3135         spill = be_new_Spill(cls, cls_frame, irg, bl, frame, irn);
3136
3137         /*
3138          * search the right insertion point. a spill of a phi cannot be put
3139          * directly after the phi, if there are some phis behind the one which
3140          * is spilled. Also, a spill of a Proj must be after all Projs of the
3141          * same tuple node.
3142          *
3143          * Here's one special case:
3144          * If the spill is in the start block, the spill must be after the frame
3145          * pointer is set up. This is done by setting insert to the end of the block
3146          * which is its default initialization (see above).
3147          */
3148
3149         if(bl == get_irg_start_block(irg) && sched_get_time_step(frame) >= sched_get_time_step(insert))
3150                 insert = frame;
3151
3152         for (next = sched_next(insert); is_Phi(next) || is_Proj(next); next = sched_next(insert))
3153                 insert = next;
3154
3155         sched_add_after(insert, spill);
3156         return spill;
3157 }
3158
3159 static void
3160 delete_remat(spill_ilp_t * si, ir_node * remat) {
3161         int       n;
3162         ir_node  *bad = get_irg_bad(si->chordal_env->irg);
3163
3164         sched_remove(remat);
3165
3166         /* kill links to operands */
3167         for (n=get_irn_arity(remat)-1; n>=-1; --n) {
3168                 set_irn_n(remat, n, bad);
3169         }
3170 }
3171
3172 static void
3173 clean_remat_info(spill_ilp_t * si)
3174 {
3175         int            n;
3176         remat_t       *remat;
3177         remat_info_t  *remat_info;
3178         ir_node       *bad = get_irg_bad(si->chordal_env->irg);
3179
3180         set_foreach(si->remat_info, remat_info) {
3181                 if(!remat_info->remats) continue;
3182
3183                 pset_foreach(remat_info->remats, remat)
3184                 {
3185                         if(remat->proj && get_irn_n_edges(remat->proj) == 0) {
3186                                 set_irn_n((ir_node*)remat->proj, -1, bad);
3187                                 set_irn_n((ir_node*)remat->proj, 0, bad);
3188                         }
3189
3190                         if(get_irn_n_edges(remat->op) == 0) {
3191                                 for (n=get_irn_arity(remat->op)-1; n>=-1; --n) {
3192                                         set_irn_n((ir_node*)remat->op, n, bad);
3193                                 }
3194                         }
3195                 }
3196
3197                 if(remat_info->remats) del_pset(remat_info->remats);
3198                 if(remat_info->remats_by_operand) del_pset(remat_info->remats_by_operand);
3199         }
3200 }
3201
3202 static void
3203 delete_unnecessary_remats(spill_ilp_t * si)
3204 {
3205         if(opt_keep_alive & KEEPALIVE_REMATS) {
3206                 int       n;
3207                 ir_node  *bad = get_irg_bad(si->chordal_env->irg);
3208
3209                 if(si->keep) {
3210 //                      ir_node   *end = get_irg_end(si->chordal_env->irg);
3211 //                      ir_node  **keeps;
3212
3213                         for (n=get_irn_arity(si->keep)-1; n>=0; --n) {
3214                                 ir_node        *keep_arg = get_irn_n(si->keep, n);
3215                                 op_t           *arg_op = get_irn_link(keep_arg);
3216                                 lpp_name_t     *name;
3217
3218                                 assert(arg_op->is_remat);
3219
3220                                 name = si->lpp->vars[arg_op->attr.remat.ilp];
3221
3222                                 if(is_zero(name->value)) {
3223                                         DBG((si->dbg, LEVEL_3, "\t  deleting remat %+F\n", keep_arg));
3224                                         /* TODO check whether reload is preferred over remat (could be bug) */
3225                                         delete_remat(si, keep_arg);
3226                                 } else {
3227                                         if(!arg_op->attr.remat.remat->inverse) {
3228                                                 if(arg_op->attr.remat.pre) {
3229                                                         DBG((si->dbg, LEVEL_2, "\t**remat kept: %+F\n", keep_arg));
3230                                                 } else {
3231                                                         DBG((si->dbg, LEVEL_2, "\t%%%%remat2 kept: %+F\n", keep_arg));
3232                                                 }
3233                                         } else {
3234                                                 if(arg_op->attr.remat.pre) {
3235                                                         DBG((si->dbg, LEVEL_2, "\t**INVERSE remat kept: %+F\n", keep_arg));
3236                                                 } else {
3237                                                         DBG((si->dbg, LEVEL_2, "\t%%%%INVERSE remat2 kept: %+F\n", keep_arg));
3238                                                 }
3239                                         }
3240                                 }
3241
3242                                 set_irn_n(si->keep, n, bad);
3243                         }
3244 #if 0
3245                         for (i = 0, n = get_End_n_keepalives(end); i < n; ++i) {
3246                                 ir_node        *end_arg = get_End_keepalive(end, i);
3247
3248                                 if(end_arg != si->keep) {
3249                                         obstack_grow(si->obst, &end_arg, sizeof(end_arg));
3250                                 }
3251                         }
3252                         keeps = obstack_finish(si->obst);
3253                         set_End_keepalives(end, n-1, keeps);
3254                         obstack_free(si->obst, keeps);
3255 #endif
3256                 } else {
3257                         DBG((si->dbg, LEVEL_2, "\t  no remats to delete (none have been inserted)\n"));
3258                 }
3259         } else {
3260                 ir_node  *remat;
3261
3262                 pset_foreach(si->all_possible_remats, remat) {
3263                         op_t           *remat_op = get_irn_link(remat);
3264                         lpp_name_t     *name = si->lpp->vars[remat_op->attr.remat.ilp];
3265
3266                         if(is_zero(name->value)) {
3267                                 DBG((si->dbg, LEVEL_3, "\t  deleting remat %+F\n", remat));
3268                                 /* TODO check whether reload is preferred over remat (could be bug) */
3269                                 delete_remat(si, remat);
3270                         } else {
3271                                 if(!remat_op->attr.remat.remat->inverse) {
3272                                         if(remat_op->attr.remat.pre) {
3273                                                 DBG((si->dbg, LEVEL_2, "\t**remat kept: %+F\n", remat));
3274                                         } else {
3275                                                 DBG((si->dbg, LEVEL_2, "\t%%%%remat2 kept: %+F\n", remat));
3276                                         }
3277                                 } else {
3278                                         if(remat_op->attr.remat.pre) {
3279                                                 DBG((si->dbg, LEVEL_2, "\t**INVERSE remat kept: %+F\n", remat));
3280                                         } else {
3281                                                 DBG((si->dbg, LEVEL_2, "\t%%%%INVERSE remat2 kept: %+F\n", remat));
3282                                         }
3283                                 }
3284                         }
3285                 }
3286         }
3287 }
3288
3289 static pset *
3290 get_spills_for_value(spill_ilp_t * si, const ir_node * value)
3291 {
3292         pset     *spills = pset_new_ptr_default();
3293
3294         const ir_node  *next;
3295         defs_t         *defs;
3296
3297         defs = set_find_def(si->values, value);
3298
3299         if(defs && defs->spills) {
3300                 for(next = defs->spills; next; next = get_irn_link(next)) {
3301                         pset_insert_ptr(spills, next);
3302                 }
3303         }
3304
3305         return spills;
3306 }
3307
3308 /**
3309  * @param before   The node after which the spill will be placed in the schedule
3310  */
3311 /* TODO set context properly */
3312 static ir_node *
3313 insert_spill(spill_ilp_t * si, ir_node * irn, const ir_node * value, ir_node * before)
3314 {
3315         defs_t   *defs;
3316         ir_node  *spill;
3317         const arch_env_t *arch_env = si->chordal_env->birg->main_env->arch_env;
3318
3319         DBG((si->dbg, LEVEL_3, "\t  inserting spill for value %+F after %+F\n", irn, before));
3320
3321         spill = be_spill2(arch_env, irn, before);
3322
3323         defs = set_insert_def(si->values, value);
3324         assert(defs);
3325
3326         /* enter into the linked list */
3327         set_irn_link(spill, defs->spills);
3328         defs->spills = spill;
3329
3330         if(opt_keep_alive & KEEPALIVE_SPILLS)
3331                 pset_insert_ptr(si->spills, spill);
3332
3333         return spill;
3334 }
3335
3336 /**
3337  * @param before   The Phi node which has to be spilled
3338  */
3339 static ir_node *
3340 insert_mem_phi(spill_ilp_t * si, ir_node * phi)
3341 {
3342         ir_node   *mem_phi;
3343         ir_node  **ins;
3344         defs_t    *defs;
3345         int        n;
3346
3347         NEW_ARR_A(ir_node*, ins, get_irn_arity(phi));
3348
3349         for(n=get_irn_arity(phi)-1; n>=0; --n) {
3350                 ins[n] = si->m_unknown;
3351         }
3352
3353         mem_phi =  new_r_Phi(si->chordal_env->irg, get_nodes_block(phi), get_irn_arity(phi), ins, mode_M);
3354
3355         defs = set_insert_def(si->values, phi);
3356         assert(defs);
3357
3358         /* enter into the linked list */
3359         set_irn_link(mem_phi, defs->spills);
3360         defs->spills = mem_phi;
3361
3362         sched_add_after(phi, mem_phi);
3363
3364         if(opt_keep_alive & KEEPALIVE_SPILLS)
3365                 pset_insert_ptr(si->spills, mem_phi);
3366
3367
3368         return mem_phi;
3369 }
3370
3371 /**
3372  * Add remat to list of defs, destroys link field!
3373  */
3374 static void
3375 insert_remat(spill_ilp_t * si, ir_node * remat)
3376 {
3377         defs_t   *defs;
3378         op_t     *remat_op = get_irn_link(remat);
3379
3380         assert(remat_op->is_remat);
3381
3382         defs = set_insert_def(si->values, remat_op->attr.remat.remat->value);
3383         assert(defs);
3384
3385         /* enter into the linked list */
3386         set_irn_link(remat, defs->remats);
3387         defs->remats = remat;
3388 }
3389
3390
3391 /**
3392  * Add reload before operation and add to list of defs
3393  */
3394 static ir_node *
3395 insert_reload(spill_ilp_t * si, const ir_node * value, ir_node * after)
3396 {
3397         defs_t   *defs;
3398         ir_node  *reload,
3399                          *spill;
3400         const arch_env_t *arch_env = si->chordal_env->birg->main_env->arch_env;
3401
3402         DBG((si->dbg, LEVEL_3, "\t  inserting reload for value %+F before %+F\n", value, after));
3403
3404         defs = set_find_def(si->values, value);
3405
3406         spill = defs->spills;
3407         assert(spill && "no spill placed before reload");
3408
3409         reload = be_reload(arch_env, si->cls, after, get_irn_mode(value), spill);
3410
3411         /* enter into the linked list */
3412         set_irn_link(reload, defs->remats);
3413         defs->remats = reload;
3414
3415         return reload;
3416 }
3417
3418 void perform_memory_operand(spill_ilp_t * si, memoperand_t * memoperand)
3419 {
3420         defs_t           *defs;
3421         ir_node          *reload;
3422         ir_node          *value = get_irn_n(memoperand->irn, memoperand->pos);
3423         ir_node          *spill;
3424         const arch_env_t *arch_env = si->chordal_env->birg->main_env->arch_env;
3425
3426         DBG((si->dbg, LEVEL_2, "\t  inserting memory operand for value %+F at %+F\n", value, memoperand->irn));
3427
3428         defs = set_find_def(si->values, value);
3429
3430         spill = defs->spills;
3431         assert(spill && "no spill placed before reload");
3432
3433         reload = be_reload(arch_env, si->cls, memoperand->irn, get_irn_mode(value), spill);
3434
3435         arch_perform_memory_operand(arch_env, memoperand->irn, reload, memoperand->pos);
3436         sched_remove(reload);
3437 }
3438
3439 void insert_memoperands(spill_ilp_t * si)
3440 {
3441         memoperand_t   *memoperand;
3442         lpp_name_t     *name;
3443
3444         set_foreach(si->memoperands, memoperand) {
3445                 name = si->lpp->vars[memoperand->ilp];
3446                 if(!is_zero(name->value)) {
3447                         perform_memory_operand(si, memoperand);
3448                 }
3449         }
3450 }
3451
3452 static void
3453 walker_spill_placer(ir_node * bb, void * data) {
3454         spill_ilp_t   *si = (spill_ilp_t*)data;
3455         ir_node       *irn;
3456         spill_bb_t    *spill_bb = get_irn_link(bb);
3457         pset          *spills_to_do = pset_new_ptr_default();
3458         spill_t       *spill;
3459
3460         set_foreach(spill_bb->ilp, spill) {
3461                 lpp_name_t    *name;
3462
3463                 if(is_Phi(spill->irn) && get_nodes_block(spill->irn) == bb) {
3464                         name = si->lpp->vars[spill->mem_in];
3465                         if(!is_zero(name->value)) {
3466                                 ir_node   *mem_phi;
3467
3468                                 mem_phi = insert_mem_phi(si, spill->irn);
3469
3470                                 DBG((si->dbg, LEVEL_2, "\t >>spilled Phi %+F -> %+F\n", spill->irn, mem_phi));
3471                         }
3472                 }
3473
3474                 name = si->lpp->vars[spill->spill];
3475                 if(!is_zero(name->value)) {
3476                         /* place spill directly after definition */
3477                         if(get_nodes_block(spill->irn) == bb) {
3478                                 insert_spill(si, spill->irn, spill->irn, spill->irn);
3479                                 continue;
3480                         }
3481
3482                         /* place spill at bb start */
3483                         if(spill->reg_in > 0) {
3484                                 name = si->lpp->vars[spill->reg_in];
3485                                 if(!is_zero(name->value)) {
3486                                         insert_spill(si, spill->irn, spill->irn, bb);
3487                                         continue;
3488                                 }
3489                         }
3490                         /* place spill after a remat */
3491                         pset_insert_ptr(spills_to_do, spill->irn);
3492                 }
3493         }
3494         DBG((si->dbg, LEVEL_3, "\t  %d spills to do in block %+F\n", pset_count(spills_to_do), bb));
3495
3496
3497         for(irn = sched_block_first_nonphi(bb); !sched_is_end(irn); irn = sched_next(irn)) {
3498                 op_t     *op = get_irn_link(irn);
3499
3500                 if(be_is_Spill(irn)) continue;
3501
3502                 if(op->is_remat) {
3503                         /* TODO fix this if we want to support remats with more than two nodes */
3504                         if(get_irn_mode(irn) != mode_T && pset_find_ptr(spills_to_do, op->attr.remat.remat->value)) {
3505                                 pset_remove_ptr(spills_to_do, op->attr.remat.remat->value);
3506
3507                                 insert_spill(si, irn, op->attr.remat.remat->value, irn);
3508                         }
3509                 } else {
3510                         if(pset_find_ptr(spills_to_do, irn)) {
3511                                 pset_remove_ptr(spills_to_do, irn);
3512
3513                                 insert_spill(si, irn, irn, irn);
3514                         }
3515                 }
3516
3517         }
3518
3519         assert(pset_count(spills_to_do) == 0);
3520
3521         /* afterwards free data in block */
3522         del_pset(spills_to_do);
3523 }
3524
3525 static ir_node *
3526 insert_mem_copy(spill_ilp_t * si, ir_node * bb, ir_node * value)
3527 {
3528         ir_node          *insert_pos = bb;
3529         ir_node          *spill;
3530         const arch_env_t *arch_env = si->chordal_env->birg->main_env->arch_env;
3531
3532         /* find last definition of arg value in block */
3533         ir_node  *next;
3534         defs_t   *defs;
3535         int       last = 0;
3536
3537         defs = set_find_def(si->values, value);
3538
3539         if(defs && defs->remats) {
3540                 for(next = defs->remats; next; next = get_irn_link(next)) {
3541                         if(get_nodes_block(next) == bb && sched_get_time_step(next) > last) {
3542                                 last = sched_get_time_step(next);
3543                                 insert_pos = next;
3544                         }
3545                 }
3546         }
3547
3548         if(get_nodes_block(value) == bb && sched_get_time_step(value) > last) {
3549                 last = sched_get_time_step(value);
3550                 insert_pos = value;
3551         }
3552
3553         DBG((si->dbg, LEVEL_2, "\t  inserting mem copy for value %+F after %+F\n", value, insert_pos));
3554
3555         spill = be_spill2(arch_env, is_Block(insert_pos)?value:insert_pos, insert_pos);
3556
3557         return spill;
3558 }
3559
3560 static void
3561 phim_fixer(spill_ilp_t *si) {
3562         defs_t  *defs;
3563
3564         set_foreach(si->values, defs) {
3565                 const ir_node  *phi = defs->value;
3566                 op_t           *op = get_irn_link(phi);
3567                 ir_node        *phi_m = NULL;
3568                 ir_node        *next = defs->spills;
3569                 int             n;
3570
3571                 if(!is_Phi(phi)) continue;
3572
3573                 while(next) {
3574                         if(is_Phi(next) && get_irn_mode(next) == mode_M) {
3575                                 phi_m = next;
3576                                 break;
3577                         } else {
3578                                 next = get_irn_link(next);
3579                         }
3580                 }
3581                 if(!phi_m) continue;
3582
3583                 for(n=get_irn_arity(phi)-1; n>=0; --n) {
3584                         ir_node        *value = get_irn_n(phi, n);
3585                         defs_t         *val_defs = set_find_def(si->values, value);
3586
3587                         /* a spill of this value */
3588                         ir_node      *spill;
3589
3590
3591                         if(opt_memcopies) {
3592                                 ir_node    *pred = get_Block_cfgpred_block(get_nodes_block(phi), n);
3593                                 lpp_name_t *name = si->lpp->vars[op->attr.live_range.args.copies[n]];
3594
3595                                 if(!is_zero(name->value)) {
3596                                         spill = insert_mem_copy(si, pred, value);
3597                                 } else {
3598                                         spill = val_defs->spills;
3599                                 }
3600                         } else {
3601                                 spill = val_defs->spills;
3602                         }
3603
3604                         assert(spill && "no spill placed before PhiM");
3605                         set_irn_n(phi_m, n, spill);
3606                 }
3607         }
3608 }
3609
3610 static void
3611 walker_reload_placer(ir_node * bb, void * data) {
3612         spill_ilp_t   *si = (spill_ilp_t*)data;
3613         ir_node       *irn;
3614         spill_bb_t    *spill_bb = get_irn_link(bb);
3615
3616         /* reloads at end of block */
3617         if(spill_bb->reloads) {
3618                 keyval_t    *keyval;
3619
3620                 set_foreach(spill_bb->reloads, keyval) {
3621                         ir_node        *irn = (ir_node*)keyval->key;
3622                         ilp_var_t       reload = PTR_TO_INT(keyval->val);
3623                         lpp_name_t     *name;
3624
3625                         name = si->lpp->vars[reload];
3626                         if(!is_zero(name->value)) {
3627                                 ir_node    *reload;
3628                                 ir_node    *insert_pos = bb;
3629                                 ir_node    *prev = sched_block_last_noncf(si, bb);
3630                                 op_t       *prev_op = get_irn_link(prev);
3631
3632                                 while(be_is_Spill(prev)) {
3633                                         prev = sched_prev(prev);
3634                                 }
3635
3636                                 prev_op = get_irn_link(prev);
3637
3638                                 /* insert reload before pre-remats */
3639                                 while(!sched_is_end(prev) && !be_is_Reload(prev) && !is_Phi(prev)
3640                                                 && prev_op->is_remat && prev_op->attr.remat.pre) {
3641                                         insert_pos = prev;
3642
3643                                         do {
3644                                                 prev = sched_prev(prev);
3645                                         } while(be_is_Spill(prev));
3646
3647                                         prev_op = get_irn_link(prev);
3648
3649                                 }
3650
3651                                 reload = insert_reload(si, irn, insert_pos);
3652
3653                                 if(opt_keep_alive & KEEPALIVE_RELOADS)
3654                                         pset_insert_ptr(si->spills, reload);
3655                         }
3656                 }
3657         }
3658
3659         /* walk and insert more reloads and collect remats */
3660         sched_foreach_reverse(bb, irn) {
3661                 op_t     *op = get_irn_link(irn);
3662
3663                 if(be_is_Reload(irn) || be_is_Spill(irn)) continue;
3664                 if(is_Phi(irn)) break;
3665
3666                 if(op->is_remat) {
3667                         if(get_irn_mode(irn) != mode_T) {
3668                                 insert_remat(si, irn);
3669                         }
3670                 } else {
3671                         int    n;
3672
3673                         for (n=get_irn_arity(irn)-1; n>=0; --n) {
3674                                 ir_node    *arg = get_irn_n(irn, n);
3675
3676                                 if(op->attr.live_range.args.reloads && op->attr.live_range.args.reloads[n] != ILP_UNDEF) {
3677                                         lpp_name_t    *name;
3678
3679                                         name = si->lpp->vars[op->attr.live_range.args.reloads[n]];
3680                                         if(!is_zero(name->value)) {
3681                                                 ir_node    *reload;
3682                                                 ir_node    *insert_pos = irn;
3683                                                 ir_node    *prev = sched_prev(insert_pos);
3684                                                 op_t       *prev_op;
3685
3686                                                 while(be_is_Spill(prev)) {
3687                                                         prev = sched_prev(prev);
3688                                                 }
3689
3690                                                 prev_op = get_irn_link(prev);
3691
3692                                                 /* insert reload before pre-remats */
3693                                                 while(!sched_is_end(prev) && !be_is_Reload(prev) && !is_Phi(prev)
3694                                                                 && prev_op->is_remat && prev_op->attr.remat.pre) {
3695                                                         insert_pos = prev;
3696
3697                                                         do {
3698                                                                 prev = sched_prev(prev);
3699                                                         } while(be_is_Spill(prev));
3700
3701                                                         prev_op = get_irn_link(prev);
3702
3703                                                 }
3704
3705                                                 reload = insert_reload(si, arg, insert_pos);
3706
3707                                                 set_irn_n(irn, n, reload);
3708
3709                                                 if(opt_keep_alive & KEEPALIVE_RELOADS)
3710                                                         pset_insert_ptr(si->spills, reload);
3711                                         }
3712                                 }
3713                         }
3714                 }
3715         }
3716
3717         del_set(spill_bb->ilp);
3718         if(spill_bb->reloads) del_set(spill_bb->reloads);
3719 }
3720
3721 static void
3722 walker_collect_used(ir_node * irn, void * data)
3723 {
3724         lc_bitset_t   *used = data;
3725
3726         lc_bitset_set(used, get_irn_idx(irn));
3727 }
3728
3729 struct kill_helper {
3730         lc_bitset_t  *used;
3731         spill_ilp_t  *si;
3732 };
3733
3734 static void
3735 walker_kill_unused(ir_node * bb, void * data)
3736 {
3737         struct kill_helper *kh = data;
3738         ir_node            *bad = get_irg_bad(get_irn_irg(bb));
3739         ir_node            *irn;
3740
3741
3742         for(irn=sched_first(bb); !sched_is_end(irn);) {
3743                 ir_node     *next = sched_next(irn);
3744                 int          n;
3745
3746                 if(!lc_bitset_is_set(kh->used, get_irn_idx(irn))) {
3747                         if(be_is_Spill(irn) || be_is_Reload(irn)) {
3748                                 DBG((kh->si->dbg, LEVEL_1, "\t SUBOPTIMAL! %+F IS UNUSED (cost: %g)\n", irn, get_cost(kh->si, irn)*execution_frequency(kh->si, bb)));
3749 #if 0
3750                                 assert(lpp_get_sol_state(kh->si->lpp) != lpp_optimal && "optimal solution is suboptimal?");
3751 #endif
3752                         }
3753
3754                         sched_remove(irn);
3755
3756                         set_nodes_block(irn, bad);
3757                         for (n=get_irn_arity(irn)-1; n>=0; --n) {
3758                                 set_irn_n(irn, n, bad);
3759                         }
3760                 }
3761                 irn = next;
3762         }
3763 }
3764
3765 static void
3766 kill_all_unused_values_in_schedule(spill_ilp_t * si)
3767 {
3768         struct kill_helper kh;
3769
3770         kh.used = lc_bitset_malloc(get_irg_last_idx(si->chordal_env->irg));
3771         kh.si = si;
3772
3773         irg_walk_graph(si->chordal_env->irg, walker_collect_used, NULL, kh.used);
3774         irg_block_walk_graph(si->chordal_env->irg, walker_kill_unused, NULL, &kh);
3775
3776         lc_bitset_free(kh.used);
3777 }
3778
3779 void
3780 print_irn_pset(pset * p)
3781 {
3782         ir_node   *irn;
3783
3784         pset_foreach(p, irn) {
3785                 ir_printf("%+F\n", irn);
3786         }
3787 }
3788
3789 void
3790 dump_phi_class(spill_ilp_t * si, pset * phiclass, const char * file)
3791 {
3792     FILE           *f = fopen(file, "w");
3793     ir_node        *irn;
3794     interference_t *interference;
3795
3796     pset_break(phiclass);
3797     set_break(si->interferences);
3798
3799     ir_fprintf(f, "digraph phiclass {\n");
3800
3801     pset_foreach(phiclass, irn) {
3802         if(is_Phi(irn))
3803             ir_fprintf(f, "  %F%N [shape=box]\n",irn,irn);
3804     }
3805
3806     pset_foreach(phiclass, irn) {
3807         int n;
3808
3809         if(!is_Phi(irn)) continue;
3810
3811         for(n=get_irn_arity(irn)-1; n>=0; --n) {
3812             ir_node  *arg = get_irn_n(irn, n);
3813
3814             ir_fprintf(f, "  %F%N -> %F%N\n",irn,irn,arg,arg);
3815         }
3816     }
3817
3818     set_foreach(si->interferences, interference) {
3819         const ir_node  *a  = interference->a;
3820         const ir_node  *b  = interference->b;
3821         if(get_phi_class(a) == phiclass) {
3822             ir_fprintf(f, "  %F%N -> %F%N [color=red,dir=none,style=bold]\n",a,a,b,b);
3823         }
3824     }
3825
3826     ir_fprintf(f, "}");
3827     fclose(f);
3828 }
3829
3830 static void
3831 rewire_uses(spill_ilp_t * si)
3832 {
3833         dom_front_info_t     *dfi = be_compute_dominance_frontiers(si->chordal_env->irg);
3834         defs_t               *defs;
3835         pset                 *ignore = pset_new_ptr(1);
3836
3837         pset_insert_ptr(ignore, get_irg_end(si->chordal_env->irg));
3838
3839         /* then fix uses of spills */
3840         set_foreach(si->values, defs) {
3841                 pset           *reloads;
3842                 pset           *spills;
3843                 const ir_node  *next = defs->remats;
3844                 int remats = 0;
3845
3846                 reloads = pset_new_ptr_default();
3847
3848                 while(next) {
3849                         if(be_is_Reload(next)) {
3850                                 pset_insert_ptr(reloads, next);
3851                         } else {
3852                                 ++remats;
3853                         }
3854                         next = get_irn_link(next);
3855                 }
3856
3857                 spills = get_spills_for_value(si, defs->value);
3858                 DBG((si->dbg, LEVEL_2, "\t  %d remats, %d reloads, and %d spills for value %+F\n", remats, pset_count(reloads), pset_count(spills), defs->value));
3859                 if(pset_count(spills) > 1) {
3860                         //assert(pset_count(reloads) > 0);
3861                         //                              print_irn_pset(spills);
3862                         //                              print_irn_pset(reloads);
3863
3864                         be_ssa_constr_set_ignore(dfi, si->lv, spills, ignore);
3865                 }
3866
3867                 del_pset(reloads);
3868                 del_pset(spills);
3869         }
3870
3871         /* first fix uses of remats and reloads */
3872         set_foreach(si->values, defs) {
3873                 pset           *nodes;
3874                 const ir_node  *next = defs->remats;
3875
3876                 if(next) {
3877                         nodes = pset_new_ptr_default();
3878                         pset_insert_ptr(nodes, defs->value);
3879
3880                         while(next) {
3881                                 pset_insert_ptr(nodes, next);
3882                                 next = get_irn_link(next);
3883                         }
3884
3885                         if(pset_count(nodes) > 1) {
3886                                 DBG((si->dbg, LEVEL_4, "\t    %d new definitions for value %+F\n", pset_count(nodes)-1, defs->value));
3887                                 be_ssa_constr_set(dfi, si->lv, nodes);
3888                         }
3889
3890                         del_pset(nodes);
3891                 }
3892         }
3893
3894 //      remove_unused_defs(si);
3895
3896         be_free_dominance_frontiers(dfi);
3897 }
3898
3899
3900 static void
3901 writeback_results(spill_ilp_t * si)
3902 {
3903         /* walk through the graph and collect all spills, reloads and remats for a value */
3904
3905         si->values = new_set(cmp_defs, 4096);
3906
3907         DBG((si->dbg, LEVEL_1, "Applying results\n"));
3908         delete_unnecessary_remats(si);
3909         si->m_unknown = new_r_Unknown(si->chordal_env->irg, mode_M);
3910         irg_block_walk_graph(si->chordal_env->irg, walker_spill_placer, NULL, si);
3911         irg_block_walk_graph(si->chordal_env->irg, walker_reload_placer, NULL, si);
3912         if(opt_memoperands)
3913                 insert_memoperands(si);
3914         phim_fixer(si);
3915
3916         /* clean the remat info! there are still back-edges leading there! */
3917         clean_remat_info(si);
3918
3919         rewire_uses(si);
3920
3921         connect_all_spills_with_keep(si);
3922
3923         del_set(si->values);
3924 }
3925
3926 static int
3927 get_n_regs(spill_ilp_t * si)
3928 {
3929         int     arch_n_regs = arch_register_class_n_regs(si->cls);
3930         int     free = 0;
3931         int     i;
3932
3933         for(i=0; i<arch_n_regs; i++) {
3934                 if(!arch_register_type_is(&si->cls->regs[i], ignore)) {
3935                         free++;
3936                 }
3937         }
3938
3939         DBG((si->dbg, LEVEL_1, "\tArchitecture has %d free registers in class %s\n", free, si->cls->name));
3940         return free;
3941 }
3942
3943 static void
3944 walker_reload_mover(ir_node * bb, void * data)
3945 {
3946         spill_ilp_t   *si = data;
3947         ir_node           *tmp;
3948
3949         sched_foreach(bb, tmp) {
3950                 if(be_is_Reload(tmp) && has_reg_class(si, tmp)) {
3951                         ir_node       *reload = tmp;
3952                         ir_node       *irn = tmp;
3953
3954                         /* move reload upwards */
3955
3956                         int pressure = (int)get_irn_link(reload);
3957                         if(pressure < si->n_regs) {
3958                                 irn = sched_prev(reload);
3959                                 DBG((si->dbg, LEVEL_5, "regpressure before %+F: %d\n", reload, pressure));
3960                                 sched_remove(reload);
3961                                 pressure = (int)get_irn_link(irn);
3962
3963                                 while(pressure < si->n_regs) {
3964                                         if( sched_is_end(irn) ||
3965                                            (be_is_Reload(irn) && has_reg_class(si, irn)) ||
3966                                            /* do not move reload before its spill */
3967                                            (irn == be_get_Reload_mem(reload)) ||
3968                                            /* do not move before phi */
3969                                            is_Phi(irn)) break;
3970
3971                                         set_irn_link(irn, INT_TO_PTR(pressure+1));
3972                                         DBG((si->dbg, LEVEL_5, "new regpressure before %+F: %d\n", irn, pressure+1));
3973                                         irn = sched_prev(irn);
3974
3975                                         pressure = (int)get_irn_link(irn);
3976                                 }
3977
3978                                 DBG((si->dbg, LEVEL_3, "putting reload %+F after %+F\n", reload, irn));
3979                                 sched_put_after(irn, reload);
3980                         }
3981                 }
3982         }
3983 }
3984
3985 static void
3986 move_reloads_upward(spill_ilp_t * si)
3987 {
3988         irg_block_walk_graph(si->chordal_env->irg, walker_reload_mover, NULL, si);
3989 }
3990
3991
3992 /**
3993  * Walk all irg blocks and check for interfering spills inside of phi classes
3994  */
3995 static void
3996 luke_meminterferencechecker(ir_node * bb, void * data)
3997 {
3998         spill_ilp_t    *si = (spill_ilp_t*)data;
3999         int             l1, l2;
4000
4001         be_lv_foreach(si->lv, bb, be_lv_state_end | be_lv_state_out | be_lv_state_in, l1) {
4002                 ir_node        *a = be_lv_get_irn(si->lv, bb, l1);
4003
4004                 if(!be_is_Spill(a) && (!is_Phi(a) || get_irn_mode(a) != mode_T)) continue;
4005
4006                 /* a is only interesting if it is in my register class and if it is inside a phi class */
4007                 if (has_reg_class(si, a) && get_phi_class(a)) {
4008                         for(l2=_be_lv_next_irn(si->lv, bb, 0xff, l1+1); l2>=0; l2=_be_lv_next_irn(si->lv, bb, 0xff, l2+1)) {
4009                                 ir_node        *b = be_lv_get_irn(si->lv, bb, l2);
4010
4011                                 if(!be_is_Spill(b) && (!is_Phi(b) || get_irn_mode(b) != mode_T)) continue;
4012
4013                                 /* a and b are only interesting if they are in the same phi class */
4014                                 if(has_reg_class(si, b) && get_phi_class(a) == get_phi_class(b)) {
4015                                         if(values_interfere_in_block(si, bb, a, b)) {
4016                                                 ir_fprintf(stderr, "$$ Spills interfere in %+F: %+F, %+F \t$$\n", bb, a, b);
4017                                         }
4018                                 }
4019                         }
4020                 }
4021         }
4022 }
4023
4024 static void
4025 verify_phiclasses(spill_ilp_t * si)
4026 {
4027         /* analyze phi classes */
4028         phi_class_compute(si->chordal_env->irg);
4029
4030         DBG((si->dbg, LEVEL_2, "\t calling memory interference checker\n"));
4031         irg_block_walk_graph(si->chordal_env->irg, luke_meminterferencechecker, NULL, si);
4032 }
4033
4034 static void
4035 walker_spillslotassigner(ir_node * irn, void * data)
4036 {
4037         void                   *cls;
4038
4039         if(!be_is_Spill(irn)) return;
4040
4041         /* set spill context to phi class if it has one ;) */
4042         (void) cls;
4043 #if 0
4044         // Matze: not needed anymore
4045         cls = get_phi_class(irn);
4046         if(cls)
4047                 be_set_Spill_context(irn, cls);
4048         else
4049                 be_set_Spill_context(irn, irn);
4050 #endif
4051 }
4052
4053
4054 static void
4055 assign_spillslots(spill_ilp_t * si)
4056 {
4057         DBG((si->dbg, LEVEL_2, "\t calling spill slot assigner\n"));
4058         irg_walk_graph(si->chordal_env->irg, walker_spillslotassigner, NULL, si);
4059 }
4060
4061 void
4062 be_spill_remat(const be_chordal_env_t * chordal_env)
4063 {
4064         char            buf[256];
4065         char            problem_name[256];
4066         char            dump_suffix[256];
4067         char            dump_suffix2[256];
4068         struct obstack  obst;
4069         spill_ilp_t     si;
4070
4071         ir_snprintf(problem_name, sizeof(problem_name), "%F_%s", chordal_env->irg, chordal_env->cls->name);
4072         ir_snprintf(dump_suffix, sizeof(dump_suffix), "-%s-remats", chordal_env->cls->name);
4073         ir_snprintf(dump_suffix2, sizeof(dump_suffix2), "-%s-pressure", chordal_env->cls->name);
4074
4075         FIRM_DBG_REGISTER(si.dbg, "firm.be.ra.spillremat");
4076         DBG((si.dbg, LEVEL_1, "\n\n\t\t===== Processing %s =====\n\n", problem_name));
4077
4078         if(opt_verify & VERIFY_DOMINANCE)
4079                 be_check_dominance(chordal_env->irg);
4080
4081         obstack_init(&obst);
4082         si.chordal_env = chordal_env;
4083         si.obst = &obst;
4084         si.cls = chordal_env->cls;
4085         si.lpp = new_lpp(problem_name, lpp_minimize);
4086         si.remat_info = new_set(cmp_remat_info, 4096);
4087         si.interferences = new_set(cmp_interference, 32);
4088         si.memoperands = new_set(cmp_memoperands, 128);
4089         si.all_possible_remats = pset_new_ptr_default();
4090         si.spills = pset_new_ptr_default();
4091         si.inverse_ops = pset_new_ptr_default();
4092         si.lv = chordal_env->lv;
4093         si.keep = NULL;
4094         si.n_regs = get_n_regs(&si);
4095
4096         set_irg_link(chordal_env->irg, &si);
4097         compute_doms(chordal_env->irg);
4098
4099         /* compute phi classes */
4100 //      phi_class_compute(chordal_env->irg);
4101
4102         be_analyze_regpressure(chordal_env, "-pre");
4103
4104         if(opt_remats) {
4105                 /* collect remats */
4106                 DBG((si.dbg, LEVEL_1, "Collecting remats\n"));
4107                 irg_walk_graph(chordal_env->irg, walker_remat_collector, NULL, &si);
4108         }
4109
4110         /* insert possible remats */
4111         DBG((si.dbg, LEVEL_1, "Inserting possible remats\n"));
4112         irg_block_walk_graph(chordal_env->irg, walker_remat_insertor, NULL, &si);
4113         DBG((si.dbg, LEVEL_2, " -> inserted %d possible remats\n", pset_count(si.all_possible_remats)));
4114
4115         if(opt_keep_alive & KEEPALIVE_REMATS) {
4116                 DBG((si.dbg, LEVEL_1, "Connecting remats with keep and dumping\n"));
4117                 connect_all_remats_with_keep(&si);
4118                 /* dump graph with inserted remats */
4119                 dump_graph_with_remats(chordal_env->irg, dump_suffix);
4120         }
4121
4122         /* insert copies for phi arguments not in my regclass */
4123         irg_walk_graph(chordal_env->irg, walker_regclass_copy_insertor, NULL, &si);
4124
4125         /* recompute liveness */
4126         DBG((si.dbg, LEVEL_1, "Recomputing liveness\n"));
4127         be_liveness_recompute(si.lv);
4128
4129         /* build the ILP */
4130
4131         DBG((si.dbg, LEVEL_1, "\tBuilding ILP\n"));
4132         DBG((si.dbg, LEVEL_2, "\t endwalker\n"));
4133         irg_block_walk_graph(chordal_env->irg, luke_endwalker, NULL, &si);
4134
4135         DBG((si.dbg, LEVEL_2, "\t blockwalker\n"));
4136         irg_block_walk_graph(chordal_env->irg, luke_blockwalker, NULL, &si);
4137
4138         if(opt_memcopies) {
4139                 DBG((si.dbg, LEVEL_2, "\t memcopyhandler\n"));
4140                 memcopyhandler(&si);
4141         }
4142
4143         if(opt_dump_flags & DUMP_PROBLEM) {
4144                 FILE           *f;
4145                 ir_snprintf(buf, sizeof(buf), "%s-spillremat.ilp", problem_name);
4146                 if ((f = fopen(buf, "wt")) != NULL) {
4147                         lpp_dump_plain(si.lpp, f);
4148                         fclose(f);
4149                 }
4150         }
4151
4152         if(opt_dump_flags & DUMP_MPS) {
4153                 FILE *f;
4154
4155                 ir_snprintf(buf, sizeof(buf), "%s-spillremat.mps", problem_name);
4156                 if((f = fopen(buf, "wt")) != NULL) {
4157                         mps_write_mps(si.lpp, s_mps_fixed, f);
4158                         fclose(f);
4159                 }
4160
4161                 ir_snprintf(buf, sizeof(buf), "%s-spillremat.mst", problem_name);
4162                 if((f = fopen(buf, "wt")) != NULL) {
4163                         mps_write_mst(si.lpp, s_mps_fixed, f);
4164                         fclose(f);
4165                 }
4166         }
4167
4168         lpp_check_startvals(si.lpp);
4169
4170 #ifdef SOLVE
4171         DBG((si.dbg, LEVEL_1, "\tSolving %s (%d variables, %d constraints)\n", problem_name, si.lpp->var_next, si.lpp->cst_next));
4172         lpp_set_time_limit(si.lpp, opt_timeout);
4173
4174         if(opt_log)
4175                 lpp_set_log(si.lpp, stdout);
4176
4177 #ifdef SOLVE_LOCAL
4178         lpp_solve_cplex(si.lpp);
4179 #else
4180         lpp_solve_net(si.lpp, LPP_SERVER, LPP_SOLVER);
4181 #endif
4182         assert(lpp_is_sol_valid(si.lpp)
4183                && "solution of ILP must be valid");
4184
4185         DBG((si.dbg, LEVEL_1, "\t%s: iterations: %d, solution time: %g, objective function: %g\n", problem_name, si.lpp->iterations, si.lpp->sol_time, is_zero(si.lpp->objval)?0.0:si.lpp->objval));
4186
4187         if(opt_dump_flags & DUMP_SOLUTION) {
4188                 FILE           *f;
4189                 char            buf[256];
4190
4191                 ir_snprintf(buf, sizeof(buf), "%s-spillremat.sol", problem_name);
4192                 if ((f = fopen(buf, "wt")) != NULL) {
4193                         int             i;
4194                         for (i = 0; i < si.lpp->var_next; ++i) {
4195                                 lpp_name_t     *name = si.lpp->vars[i];
4196                                 fprintf(f, "%20s %4d %10f\n", name->name, name->nr, name->value);
4197                         }
4198                         fclose(f);
4199                 }
4200         }
4201
4202         writeback_results(&si);
4203
4204 #endif                          /* SOLVE */
4205
4206         kill_all_unused_values_in_schedule(&si);
4207
4208         if(opt_keep_alive & (KEEPALIVE_SPILLS | KEEPALIVE_RELOADS))
4209                 be_dump(chordal_env->irg, "-spills-placed", dump_ir_block_graph);
4210
4211         // move reloads upwards
4212         be_liveness_recompute(si.lv);
4213         irg_block_walk_graph(chordal_env->irg, walker_pressure_annotator, NULL, &si);
4214         move_reloads_upward(&si);
4215
4216         if(opt_memcopies) {
4217                 verify_phiclasses(&si);
4218                 assign_spillslots(&si);
4219         }
4220
4221         irg_block_walk_graph(chordal_env->irg, walker_pressure_annotator, NULL, &si);
4222
4223         dump_pressure_graph(&si, dump_suffix2);
4224
4225         be_analyze_regpressure(chordal_env, "-post");
4226
4227         if(opt_verify & VERIFY_DOMINANCE)
4228                 be_check_dominance(chordal_env->irg);
4229
4230         free_dom(chordal_env->irg);
4231         del_set(si.interferences);
4232         del_pset(si.inverse_ops);
4233         del_pset(si.all_possible_remats);
4234         del_set(si.memoperands);
4235         del_pset(si.spills);
4236         free_lpp(si.lpp);
4237         obstack_free(&obst, NULL);
4238         DBG((si.dbg, LEVEL_1, "\tdone.\n"));
4239 }
4240
4241 #else                           /* WITH_ILP */
4242
4243 static void
4244 only_that_you_can_compile_without_WITH_ILP_defined(void)
4245 {
4246 }
4247
4248 #endif                          /* WITH_ILP */