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

   1 /**
   2  * @file   bechordal_main.c
   3  * @date   29.11.2005
   4  * @author Sebastian Hack
   5  *
   6  * Copyright (C) 2005 Universitaet Karlsruhe
   7  * Released under the GPL
   8  *
   9  * Driver for the chordal register allocator.
  10  */
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #include "obst.h"
  16 #include "pset.h"
  17 #include "list.h"
  18 #include "bitset.h"
  19 #include "iterator.h"
  20
  21 #ifdef WITH_LIBCORE
  22 #include <libcore/lc_opts.h>
  23 #include <libcore/lc_opts_enum.h>
  24 #endif /* WITH_LIBCORE */
  25
  26 #include "irmode_t.h"
  27 #include "irgraph_t.h"
  28 #include "irprintf_t.h"
  29 #include "irgwalk.h"
  30 #include "irdump.h"
  31 #include "irdom.h"
  32 #include "debug.h"
  33 #include "xmalloc.h"
  34
  35 #include "bechordal_t.h"
  36 #include "beabi.h"
  37 #include "beutil.h"
  38 #include "besched.h"
  39 #include "benumb_t.h"
  40 #include "besched_t.h"
  41 #include "belive_t.h"
  42 #include "bearch.h"
  43 #include "beifg_t.h"
  44 #include "beifg_impl.h"
  45
  46 #include "bespillbelady.h"
  47 #include "belower.h"
  48
  49 #ifdef WITH_ILP
  50 #include "bespillilp.h"
  51 #endif /* WITH_ILP */
  52
  53 #include "becopystat.h"
  54 #include "becopyopt.h"
  55 #include "bessadestr.h"
  56
  57
  58 void be_ra_chordal_check(be_chordal_env_t *chordal_env) {
  59         const arch_env_t *arch_env = chordal_env->birg->main_env->arch_env;
  60         struct obstack ob;
  61         pmap_entry *pme;
  62         ir_node **nodes, *n1, *n2;
  63         int i, o;
  64         DEBUG_ONLY(firm_dbg_module_t *dbg = chordal_env->dbg;)
  65
  66         /* Collect all irns */
  67         obstack_init(&ob);
  68         pmap_foreach(chordal_env->border_heads, pme) {
  69                 border_t *curr;
  70                 struct list_head *head = pme->value;
  71                 list_for_each_entry(border_t, curr, head, list)
  72                         if (curr->is_def && curr->is_real)
  73                                 if (arch_get_irn_reg_class(arch_env, curr->irn, -1) == chordal_env->cls)
  74                                         obstack_ptr_grow(&ob, curr->irn);
  75         }
  76         obstack_ptr_grow(&ob, NULL);
  77         nodes = (ir_node **) obstack_finish(&ob);
  78
  79         /* Check them */
  80         for (i = 0, n1 = nodes[i]; n1; n1 = nodes[++i]) {
  81                 const arch_register_t *n1_reg, *n2_reg;
  82
  83                 n1_reg = arch_get_irn_register(arch_env, n1);
  84                 if (!arch_reg_is_allocatable(arch_env, n1, -1, n1_reg)) {
  85                         DBG((dbg, 0, "Register %s assigned to %+F is not allowed\n", n1_reg->name, n1));
  86                         assert(0 && "Register constraint does not hold");
  87                 }
  88                 for (o = i+1, n2 = nodes[o]; n2; n2 = nodes[++o]) {
  89                         n2_reg = arch_get_irn_register(arch_env, n2);
  90                         if (values_interfere(n1, n2) && n1_reg == n2_reg) {
  91                                 DBG((dbg, 0, "Values %+F and %+F interfere and have the same register assigned\n", n1, n2));
  92                                 assert(0 && "Interfering values have the same color!");
  93                         }
  94                 }
  95         }
  96         obstack_free(&ob, NULL);
  97 }
  98
  99 static void check_pressure_walker(ir_node *bl, void *data)
 100 {
 101         be_chordal_env_t *env = data;
 102         int n_regs = arch_register_class_n_regs(env->cls);
 103
 104         pset *live = pset_new_ptr_default();
 105         int step = 0;
 106         ir_node *irn;
 107         irn_live_t *li;
 108         DEBUG_ONLY(firm_dbg_module_t *dbg = env->dbg;)
 109
 110         live_foreach(bl, li) {
 111                 if(live_is_end(li) && chordal_has_class(env, li->irn)) {
 112                         ir_node *irn = (ir_node *) li->irn;
 113                         pset_insert_ptr(live, irn);
 114                 }
 115         }
 116
 117         DBG((dbg, LEVEL_1, "end set for %+F\n", bl));
 118         for(irn = pset_first(live); irn; irn = pset_next(live))
 119                 DBG((dbg, LEVEL_1, "\t%+F\n", irn));
 120
 121         sched_foreach_reverse(bl, irn) {
 122                 int i, n;
 123                 int pressure = pset_count(live);
 124
 125                 DBG((dbg, LEVEL_1, "%+10F@%+10F: pressure %d\n", bl, irn, pressure));
 126
 127                 if(pressure > n_regs) {
 128                         ir_node *x;
 129                         ir_printf("%+10F@%+10F: pressure to high: %d\n", bl, irn, pressure);
 130                         for(x = pset_first(live); x; x = pset_next(live))
 131                                 ir_printf("\t%+10F\n", x);
 132                 }
 133
 134                 if(chordal_has_class(env, irn))
 135                         pset_remove_ptr(live, irn);
 136
 137                 for(i = 0, n = get_irn_arity(irn); i < n; i++) {
 138                         ir_node *op = get_irn_n(irn, i);
 139                         if(chordal_has_class(env, op) && !is_Phi(irn))
 140                                 pset_insert_ptr(live, op);
 141                 }
 142                 step++;
 143         }
 144 }
 145
 146 void be_check_pressure(const be_chordal_env_t *env)
 147 {
 148         irg_block_walk_graph(env->irg, check_pressure_walker, NULL, (void *) env);
 149 }
 150
 151 int nodes_interfere(const be_chordal_env_t *env, const ir_node *a, const ir_node *b)
 152 {
 153         if(env->ifg)
 154                 return be_ifg_connected(env->ifg, a, b);
 155         else
 156                 return values_interfere(a, b);
 157 }
 158
 159
 160 static be_ra_chordal_opts_t options = {
 161         BE_CH_DUMP_NONE,
 162         BE_CH_SPILL_BELADY,
 163         BE_CH_COPYMIN_HEUR,
 164         BE_CH_IFG_STD,
 165         BE_CH_LOWER_PERM_SWAP,
 166 };
 167
 168 #ifdef WITH_LIBCORE
 169 static const lc_opt_enum_int_items_t spill_items[] = {
 170         { "belady", BE_CH_SPILL_BELADY },
 171 #ifdef WITH_ILP
 172         { "ilp",        BE_CH_SPILL_ILP },
 173 #endif
 174         { NULL, 0 }
 175 };
 176
 177 static const lc_opt_enum_int_items_t copymin_items[] = {
 178         { "none", BE_CH_COPYMIN_NONE },
 179         { "heur", BE_CH_COPYMIN_HEUR },
 180 #ifdef WITH_ILP
 181         { "ilp",  BE_CH_COPYMIN_ILP },
 182 #endif
 183         { NULL, 0 }
 184 };
 185
 186 static const lc_opt_enum_int_items_t ifg_flavor_items[] = {
 187         { "std",  BE_CH_IFG_STD },
 188         { "fast", BE_CH_IFG_FAST },
 189         { NULL, 0 }
 190 };
 191
 192 static const lc_opt_enum_int_items_t lower_perm_items[] = {
 193         { "copy", BE_CH_LOWER_PERM_COPY },
 194         { "swap", BE_CH_LOWER_PERM_SWAP },
 195         { NULL, 0 }
 196 };
 197
 198 static const lc_opt_enum_int_items_t lower_perm_stat_items[] = {
 199         { NULL, 0 }
 200 };
 201
 202 static const lc_opt_enum_int_items_t dump_items[] = {
 203         { "spill",    BE_CH_DUMP_SPILL },
 204         { "live",     BE_CH_DUMP_LIVE },
 205         { "color",    BE_CH_DUMP_COLOR },
 206         { "copymin",  BE_CH_DUMP_COPYMIN },
 207         { "ssadestr", BE_CH_DUMP_SSADESTR },
 208         { "tree",     BE_CH_DUMP_TREE_INTV },
 209         { "constr",   BE_CH_DUMP_CONSTR },
 210         { "lower",    BE_CH_DUMP_LOWER },
 211         { NULL, 0 }
 212 };
 213
 214 static lc_opt_enum_int_var_t spill_var = {
 215         &options.spill_method, spill_items
 216 };
 217
 218 static lc_opt_enum_int_var_t copymin_var = {
 219         &options.copymin_method, copymin_items
 220 };
 221
 222 static lc_opt_enum_int_var_t ifg_flavor_var = {
 223         &options.spill_method, ifg_flavor_items
 224 };
 225
 226 static lc_opt_enum_int_var_t lower_perm_var = {
 227         &options.lower_perm_opt, lower_perm_items
 228 };
 229
 230 static lc_opt_enum_int_var_t dump_var = {
 231         &options.dump_flags, dump_items
 232 };
 233
 234 static const lc_opt_table_entry_t be_chordal_options[] = {
 235         LC_OPT_ENT_ENUM_MASK("spill", "spill method (belady or ilp)", &spill_var),
 236         LC_OPT_ENT_ENUM_PTR("copymin", "copymin method (none, heur or ilp)", &copymin_var),
 237         LC_OPT_ENT_ENUM_PTR("ifg", "interference graph flavour (std or fast)", &ifg_flavor_var),
 238         LC_OPT_ENT_ENUM_MASK("perm", "perm lowering options (copy, swap)", &lower_perm_var),
 239         LC_OPT_ENT_ENUM_MASK("dump", "select dump phases", &dump_var),
 240         { NULL }
 241 };
 242
 243 static void be_ra_chordal_register_options(lc_opt_entry_t *grp)
 244 {
 245         static int run_once = 0;
 246         lc_opt_entry_t *chordal_grp;
 247
 248         if (! run_once) {
 249                 run_once    = 1;
 250                 chordal_grp = lc_opt_get_grp(grp, "chordal");
 251
 252                 lc_opt_add_table(chordal_grp, be_chordal_options);
 253         }
 254 }
 255 #endif
 256
 257 static void dump(unsigned mask, ir_graph *irg,
 258                                  const arch_register_class_t *cls,
 259                                  const char *suffix,
 260                                  void (*dump_func)(ir_graph *, const char *))
 261 {
 262         if(1 || ((options.dump_flags & mask) == mask)) {
 263                 if(cls) {
 264                         char buf[256];
 265                         snprintf(buf, sizeof(buf), "-%s%s", cls->name, suffix);
 266                         be_dump(irg, buf, dump_func);
 267                 }
 268
 269                 else
 270                         be_dump(irg, suffix, dump_func);
 271         }
 272 }
 273
 274 static void put_ignore_colors(be_chordal_env_t *chordal_env)
 275 {
 276         int n_colors = chordal_env->cls->n_regs;
 277         int i;
 278
 279         bitset_clear_all(chordal_env->ignore_colors);
 280         be_abi_put_ignore_regs(chordal_env->birg->abi, chordal_env->cls, chordal_env->ignore_colors);
 281         for(i = 0; i < n_colors; ++i)
 282                 if(arch_register_type_is(&chordal_env->cls->regs[i], ignore))
 283                         bitset_set(chordal_env->ignore_colors, i);
 284 }
 285
 286 static void be_ra_chordal_main(const be_irg_t *bi)
 287 {
 288         const be_main_env_t *main_env = bi->main_env;
 289         const arch_isa_t *isa         = arch_env_get_isa(main_env->arch_env);
 290         ir_graph *irg                 = bi->irg;
 291
 292         int j, m;
 293         be_chordal_env_t chordal_env;
 294
 295         compute_doms(irg);
 296
 297         chordal_env.opts          = &options;
 298         chordal_env.irg           = irg;
 299         chordal_env.birg          = bi;
 300         chordal_env.dom_front     = be_compute_dominance_frontiers(irg);
 301         FIRM_DBG_REGISTER(chordal_env.dbg, "firm.be.chordal");
 302
 303         obstack_init(&chordal_env.obst);
 304
 305         /* Perform the following for each register class. */
 306         for(j = 0, m = arch_isa_get_n_reg_class(isa); j < m; ++j) {
 307                 chordal_env.cls           = arch_isa_get_reg_class(isa, j);
 308                 chordal_env.border_heads  = pmap_create();
 309                 chordal_env.ignore_colors = bitset_malloc(chordal_env.cls->n_regs);
 310
 311                 /* put all ignore registers into the ignore register set. */
 312                 put_ignore_colors(&chordal_env);
 313
 314                 be_liveness(irg);
 315                 dump(BE_CH_DUMP_LIVE, irg, chordal_env.cls, "-live", dump_ir_block_graph_sched);
 316
 317                 /* spilling */
 318                 switch(options.spill_method) {
 319                 case BE_CH_SPILL_BELADY:
 320                         be_spill_belady(&chordal_env);
 321                         break;
 322 #ifdef WITH_ILP
 323                 case BE_CH_SPILL_ILP:
 324                         be_spill_ilp(&chordal_env);
 325                         break;
 326 #endif /* WITH_ILP */
 327                 default:
 328                         fprintf(stderr, "no valid spiller selected. falling back to belady\n");
 329                         be_spill_belady(&chordal_env);
 330                 }
 331                 dump(BE_CH_DUMP_SPILL, irg, chordal_env.cls, "-spill", dump_ir_block_graph_sched);
 332                 be_liveness(irg);
 333                 be_check_pressure(&chordal_env);
 334
 335                 /* Color the graph. */
 336                 be_ra_chordal_color(&chordal_env);
 337                 dump(BE_CH_DUMP_CONSTR, irg, chordal_env.cls, "-color", dump_ir_block_graph_sched);
 338
 339                 /* Build the interference graph. */
 340                 chordal_env.ifg = be_ifg_std_new(&chordal_env);
 341                 be_ifg_check(chordal_env.ifg);
 342
 343                 /* copy minimization */
 344 #ifdef COPYOPT_STAT
 345                 co_compare_solvers(&chordal_env);
 346 #else
 347                 if (options.copymin_method != BE_CH_COPYMIN_NONE)
 348                 {
 349                         copy_opt_t *co = new_copy_opt(&chordal_env, co_get_costs_loop_depth);
 350                         co_build_ou_structure(co);
 351                         co_solve_heuristic(co);
 352                         co_free_ou_structure(co);
 353                         free_copy_opt(co);
 354                 }
 355 #endif
 356                 dump(BE_CH_DUMP_COPYMIN, irg, chordal_env.cls, "-copymin", dump_ir_block_graph_sched);
 357                 be_ra_chordal_check(&chordal_env);
 358
 359                 /* ssa destruction */
 360                 be_ssa_destruction(&chordal_env);
 361                 dump(BE_CH_DUMP_SSADESTR, irg, chordal_env.cls, "-ssadestr", dump_ir_block_graph_sched);
 362                 be_ssa_destruction_check(&chordal_env);
 363                 be_ra_chordal_check(&chordal_env);
 364
 365                 copystat_dump(irg);
 366
 367                 be_ifg_free(chordal_env.ifg);
 368                 pmap_destroy(chordal_env.border_heads);
 369                 bitset_free(chordal_env.ignore_colors);
 370         }
 371
 372         be_compute_spill_offsets(&chordal_env);
 373
 374         dump(BE_CH_DUMP_LOWER, irg, NULL, "-spilloff", dump_ir_block_graph_sched);
 375
 376         lower_nodes_after_ra(&chordal_env, options.lower_perm_opt & BE_CH_LOWER_PERM_COPY ? 1 : 0);
 377         dump(BE_CH_DUMP_LOWER, irg, NULL, "-belower-after-ra", dump_ir_block_graph_sched);
 378
 379         obstack_free(&chordal_env.obst, NULL);
 380         be_free_dominance_frontiers(chordal_env.dom_front);
 381 }
 382
 383 const be_ra_t be_ra_chordal_allocator = {
 384 #ifdef WITH_LIBCORE
 385         be_ra_chordal_register_options,
 386 #endif
 387         be_ra_chordal_main
 388 };