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 "beutil.h"
  37 #include "besched.h"
  38 #include "benumb_t.h"
  39 #include "besched_t.h"
  40 #include "belive_t.h"
  41 #include "bearch.h"
  42 #include "beifg_t.h"
  43 #include "beifg_impl.h"
  44
  45 #include "bespillbelady.h"
  46 #include "bespillilp.h"
  47 #include "beconstrperm.h"
  48 #include "belower.h"
  49
  50 #include "becopyoptmain.h"
  51 #include "bessadestr.h"
  52 #include "becopystat.h"
  53
  54
  55 void be_ra_chordal_check(be_chordal_env_t *chordal_env) {
  56         firm_dbg_module_t *dbg = chordal_env->dbg;
  57         const arch_env_t *arch_env = chordal_env->main_env->arch_env;
  58         struct obstack ob;
  59         pmap_entry *pme;
  60         ir_node **nodes, *n1, *n2;
  61         int i, o;
  62
  63         /* Collect all irns */
  64         obstack_init(&ob);
  65         pmap_foreach(chordal_env->border_heads, pme) {
  66                 border_t *curr;
  67                 struct list_head *head = pme->value;
  68                 list_for_each_entry(border_t, curr, head, list)
  69                         if (curr->is_def && curr->is_real)
  70                                 if (arch_get_irn_reg_class(arch_env, curr->irn, -1) == chordal_env->cls)
  71                                         obstack_ptr_grow(&ob, curr->irn);
  72         }
  73         obstack_ptr_grow(&ob, NULL);
  74         nodes = (ir_node **) obstack_finish(&ob);
  75
  76         /* Check them */
  77         for (i = 0, n1 = nodes[i]; n1; n1 = nodes[++i]) {
  78                 const arch_register_t *n1_reg, *n2_reg;
  79
  80                 n1_reg = arch_get_irn_register(arch_env, n1);
  81                 if (!arch_reg_is_allocatable(arch_env, n1, -1, n1_reg)) {
  82                         DBG((dbg, 0, "Register %s assigned to %+F is not allowed\n", n1_reg->name, n1));
  83                         assert(0 && "Register constraint does not hold");
  84                 }
  85                 for (o = i+1, n2 = nodes[o]; n2; n2 = nodes[++o]) {
  86                         n2_reg = arch_get_irn_register(arch_env, n2);
  87                         if (values_interfere(n1, n2) && n1_reg == n2_reg) {
  88                                 DBG((dbg, 0, "Values %+F and %+F interfere and have the same register assigned\n", n1, n2));
  89                                 assert(0 && "Interfering values have the same color!");
  90                         }
  91                 }
  92         }
  93         obstack_free(&ob, NULL);
  94 }
  95
  96 static void check_pressure_walker(ir_node *bl, void *data)
  97 {
  98         be_chordal_env_t *env = data;
  99         firm_dbg_module_t *dbg = env->dbg;
 100         int n_regs = arch_register_class_n_regs(env->cls);
 101
 102         pset *live = pset_new_ptr_default();
 103         int step = 0;
 104         ir_node *irn;
 105         irn_live_t *li;
 106
 107         live_foreach(bl, li) {
 108                 if(live_is_end(li) && chordal_has_class(env, li->irn)) {
 109                         ir_node *irn = (ir_node *) li->irn;
 110                         pset_insert_ptr(live, irn);
 111                 }
 112         }
 113
 114         DBG((dbg, LEVEL_1, "end set for %+F\n", bl));
 115         for(irn = pset_first(live); irn; irn = pset_next(live))
 116                 DBG((dbg, LEVEL_1, "\t%+F\n", irn));
 117
 118         sched_foreach_reverse(bl, irn) {
 119                 int i, n;
 120                 int pressure = pset_count(live);
 121
 122                 DBG((dbg, LEVEL_1, "%+10F@%+10F: pressure %d\n", bl, irn, pressure));
 123
 124                 if(pressure > n_regs) {
 125                         ir_node *x;
 126                         ir_printf("%+10F@%+10F: pressure to high: %d\n", bl, irn, pressure);
 127                         for(x = pset_first(live); x; x = pset_next(live))
 128                                 ir_printf("\t%+10F\n", x);
 129                 }
 130
 131                 if(chordal_has_class(env, irn))
 132                         pset_remove_ptr(live, irn);
 133
 134                 for(i = 0, n = get_irn_arity(irn); i < n; i++) {
 135                         ir_node *op = get_irn_n(irn, i);
 136                         if(chordal_has_class(env, op) && !is_Phi(irn))
 137                                 pset_insert_ptr(live, op);
 138                 }
 139                 step++;
 140         }
 141 }
 142
 143 void be_check_pressure(const be_chordal_env_t *env)
 144 {
 145         irg_block_walk_graph(env->irg, check_pressure_walker, NULL, (void *) env);
 146 }
 147
 148 int nodes_interfere(const be_chordal_env_t *env, const ir_node *a, const ir_node *b)
 149 {
 150         if(env->ifg)
 151                 return be_ifg_connected(env->ifg, a, b);
 152         else
 153                 return values_interfere(a, b);
 154 }
 155
 156
 157 static be_ra_chordal_opts_t options = {
 158         BE_CH_DUMP_ALL,
 159         BE_CH_SPILL_BELADY,
 160         BE_CH_COPYMIN_HEUR,
 161         BE_CH_IFG_STD,
 162         BE_CH_LOWER_PERM_SWAP
 163 };
 164
 165 #ifdef WITH_LIBCORE
 166 static const lc_opt_enum_int_items_t spill_items[] = {
 167         { "belady", BE_CH_SPILL_BELADY },
 168         { "ilp",        BE_CH_SPILL_ILP },
 169         { NULL, 0 }
 170 };
 171
 172 static const lc_opt_enum_int_items_t copymin_items[] = {
 173         { "heur", BE_CH_COPYMIN_HEUR },
 174         { "ilp",  BE_CH_COPYMIN_ILP },
 175         { NULL, 0 }
 176 };
 177
 178 static const lc_opt_enum_int_items_t ifg_flavor_items[] = {
 179         { "std",  BE_CH_IFG_STD },
 180         { "fast", BE_CH_IFG_FAST },
 181         { NULL, 0 }
 182 };
 183
 184 static const lc_opt_enum_int_items_t lower_perm_items[] = {
 185         { "swap", BE_CH_LOWER_PERM_SWAP },
 186         { "copy", BE_CH_LOWER_PERM_COPY },
 187         { NULL, 0 }
 188 };
 189
 190 static lc_opt_enum_int_var_t spill_var = {
 191         &options.spill_method, spill_items
 192 };
 193
 194 static lc_opt_enum_int_var_t copymin_var = {
 195         &options.copymin_method, copymin_items
 196 };
 197
 198 static lc_opt_enum_int_var_t ifg_flavor_var = {
 199         &options.spill_method, ifg_flavor_items
 200 };
 201
 202 static lc_opt_enum_int_var_t lower_perm_var = {
 203         &options.lower_perm_method, lower_perm_items
 204 };
 205
 206 static void be_ra_chordal_register_options(lc_opt_entry_t *grp)
 207 {
 208         grp = lc_opt_get_grp(grp, "chordal");
 209 }
 210 #endif
 211
 212 static void dump(unsigned mask, ir_graph *irg,
 213                                  const arch_register_class_t *cls,
 214                                  const char *suffix,
 215                                  void (*dump_func)(ir_graph *, const char *))
 216 {
 217         if(1 || (options.dump_flags & mask) == mask) {
 218                 if(cls) {
 219                         char buf[256];
 220                         snprintf(buf, sizeof(buf), "-%s%s", cls->name, suffix);
 221                         dump_func(irg, buf);
 222                 }
 223
 224                 else
 225                         dump_func(irg, suffix);
 226         }
 227 }
 228
 229 static void be_ra_chordal_main(const be_main_env_t *main_env, ir_graph *irg)
 230 {
 231         int j, m;
 232         be_chordal_env_t chordal_env;
 233         const arch_isa_t *isa = arch_env_get_isa(main_env->arch_env);
 234
 235         compute_doms(irg);
 236
 237         chordal_env.irg          = irg;
 238         chordal_env.dbg          = firm_dbg_register("be.chordal");
 239         chordal_env.main_env     = main_env;
 240         chordal_env.dom_front    = be_compute_dominance_frontiers(irg);
 241
 242         obstack_init(&chordal_env.obst);
 243
 244         /* Perform the following for each register class. */
 245         for(j = 0, m = arch_isa_get_n_reg_class(isa); j < m; ++j) {
 246                 chordal_env.border_heads = pmap_create();
 247                 chordal_env.cls = arch_isa_get_reg_class(isa, j);
 248
 249                 be_liveness(irg);
 250                 dump(BE_CH_DUMP_LIVE, irg, chordal_env.cls, "-live", dump_ir_block_graph_sched);
 251
 252                 /* spilling */
 253                 switch(options.spill_method) {
 254                 case BE_CH_SPILL_BELADY:
 255                         be_spill_belady(&chordal_env);
 256                         break;
 257                 case BE_CH_SPILL_ILP:
 258                         be_spill_ilp(&chordal_env);
 259                         break;
 260                 default:
 261                         fprintf(stderr, "no valid spiller selected. falling back to belady\n");
 262                         be_spill_belady(&chordal_env);
 263                 }
 264                 dump(BE_CH_DUMP_SPILL, irg, chordal_env.cls, "-spill", dump_ir_block_graph_sched);
 265                 be_liveness(irg);
 266                 be_check_pressure(&chordal_env);
 267
 268                 /* Insert perms before reg-constrained instructions */
 269                 be_insert_constr_perms(&chordal_env);
 270                 dump(BE_CH_DUMP_CONSTR, irg, chordal_env.cls, "-constr", dump_ir_block_graph_sched);
 271
 272                 be_liveness(irg);
 273                 be_numbering(irg);
 274                 be_check_pressure(&chordal_env);
 275
 276                 /* Color the graph. */
 277                 be_ra_chordal_color(&chordal_env);
 278                 dump(BE_CH_DUMP_CONSTR, irg, chordal_env.cls, "-color", dump_ir_block_graph_sched);
 279
 280                 /* Build the interference graph. */
 281                 chordal_env.ifg = be_ifg_std_new(&chordal_env);
 282                 be_ifg_check(chordal_env.ifg);
 283
 284                 /* copy minimization */
 285                 copystat_collect_cls(&chordal_env);
 286                 be_copy_opt(&chordal_env);
 287                 dump(BE_CH_DUMP_COPYMIN, irg, chordal_env.cls, "-copymin", dump_ir_block_graph_sched);
 288                 be_ra_chordal_check(&chordal_env);
 289
 290                 /* ssa destruction */
 291                 be_ssa_destruction(&chordal_env);
 292                 dump(BE_CH_DUMP_SSADESTR, irg, chordal_env.cls, "-ssadestr", dump_ir_block_graph_sched);
 293                 be_ssa_destruction_check(&chordal_env);
 294                 be_ra_chordal_check(&chordal_env);
 295
 296                 copystat_dump(irg);
 297
 298                 be_ifg_free(chordal_env.ifg);
 299                 be_numbering_done(irg);
 300
 301                 pmap_destroy(chordal_env.border_heads);
 302         }
 303
 304         be_compute_spill_offsets(&chordal_env);
 305
 306         dump(BE_CH_DUMP_LOWER, irg, NULL, "-spilloff", dump_ir_block_graph_sched);
 307
 308         lower_nodes_after_ra(&chordal_env, options.lower_perm_method == BE_CH_LOWER_PERM_COPY ? 1 : 0);
 309         dump(BE_CH_DUMP_LOWER, irg, NULL, "-belower-after-ra", dump_ir_block_graph_sched);
 310
 311         be_free_dominance_frontiers(chordal_env.dom_front);
 312         obstack_free(&chordal_env.obst, NULL);
 313 }
 314
 315 const be_ra_t be_ra_chordal_allocator = {
 316 #ifdef WITH_LIBCORE
 317         be_ra_chordal_register_options,
 318 #endif
 319         be_ra_chordal_main
 320 };