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 "belower.h"
  48
  49 #include "becopyoptmain.h"
  50 #include "bessadestr.h"
  51 #include "becopystat.h"
  52
  53
  54 void be_ra_chordal_check(be_chordal_env_t *chordal_env) {
  55         firm_dbg_module_t *dbg = chordal_env->dbg;
  56         const arch_env_t *arch_env = chordal_env->main_env->arch_env;
  57         struct obstack ob;
  58         pmap_entry *pme;
  59         ir_node **nodes, *n1, *n2;
  60         int i, o;
  61
  62         /* Collect all irns */
  63         obstack_init(&ob);
  64         pmap_foreach(chordal_env->border_heads, pme) {
  65                 border_t *curr;
  66                 struct list_head *head = pme->value;
  67                 list_for_each_entry(border_t, curr, head, list)
  68                         if (curr->is_def && curr->is_real)
  69                                 if (arch_get_irn_reg_class(arch_env, curr->irn, -1) == chordal_env->cls)
  70                                         obstack_ptr_grow(&ob, curr->irn);
  71         }
  72         obstack_ptr_grow(&ob, NULL);
  73         nodes = (ir_node **) obstack_finish(&ob);
  74
  75         /* Check them */
  76         for (i = 0, n1 = nodes[i]; n1; n1 = nodes[++i]) {
  77                 const arch_register_t *n1_reg, *n2_reg;
  78
  79                 n1_reg = arch_get_irn_register(arch_env, n1);
  80                 if (!arch_reg_is_allocatable(arch_env, n1, -1, n1_reg)) {
  81                         DBG((dbg, 0, "Register %s assigned to %+F is not allowed\n", n1_reg->name, n1));
  82                         assert(0 && "Register constraint does not hold");
  83                 }
  84                 for (o = i+1, n2 = nodes[o]; n2; n2 = nodes[++o]) {
  85                         n2_reg = arch_get_irn_register(arch_env, n2);
  86                         if (values_interfere(n1, n2) && n1_reg == n2_reg) {
  87                                 DBG((dbg, 0, "Values %+F and %+F interfere and have the same register assigned\n", n1, n2));
  88                                 assert(0 && "Interfering values have the same color!");
  89                         }
  90                 }
  91         }
  92         obstack_free(&ob, NULL);
  93 }
  94
  95 static void check_pressure_walker(ir_node *bl, void *data)
  96 {
  97         be_chordal_env_t *env = data;
  98         firm_dbg_module_t *dbg = env->dbg;
  99         int n_regs = arch_register_class_n_regs(env->cls);
 100
 101         pset *live = pset_new_ptr_default();
 102         int step = 0;
 103         ir_node *irn;
 104         irn_live_t *li;
 105
 106         live_foreach(bl, li) {
 107                 if(live_is_end(li) && chordal_has_class(env, li->irn)) {
 108                         ir_node *irn = (ir_node *) li->irn;
 109                         pset_insert_ptr(live, irn);
 110                 }
 111         }
 112
 113         DBG((dbg, LEVEL_1, "end set for %+F\n", bl));
 114         for(irn = pset_first(live); irn; irn = pset_next(live))
 115                 DBG((dbg, LEVEL_1, "\t%+F\n", irn));
 116
 117         sched_foreach_reverse(bl, irn) {
 118                 int i, n;
 119                 int pressure = pset_count(live);
 120
 121                 DBG((dbg, LEVEL_1, "%+10F@%+10F: pressure %d\n", bl, irn, pressure));
 122
 123                 if(pressure > n_regs) {
 124                         ir_node *x;
 125                         ir_printf("%+10F@%+10F: pressure to high: %d\n", bl, irn, pressure);
 126                         for(x = pset_first(live); x; x = pset_next(live))
 127                                 ir_printf("\t%+10F\n", x);
 128                 }
 129
 130                 if(chordal_has_class(env, irn))
 131                         pset_remove_ptr(live, irn);
 132
 133                 for(i = 0, n = get_irn_arity(irn); i < n; i++) {
 134                         ir_node *op = get_irn_n(irn, i);
 135                         if(chordal_has_class(env, op) && !is_Phi(irn))
 136                                 pset_insert_ptr(live, op);
 137                 }
 138                 step++;
 139         }
 140 }
 141
 142 void be_check_pressure(const be_chordal_env_t *env)
 143 {
 144         irg_block_walk_graph(env->irg, check_pressure_walker, NULL, (void *) env);
 145 }
 146
 147 int nodes_interfere(const be_chordal_env_t *env, const ir_node *a, const ir_node *b)
 148 {
 149         if(env->ifg)
 150                 return be_ifg_connected(env->ifg, a, b);
 151         else
 152                 return values_interfere(a, b);
 153 }
 154
 155
 156 static be_ra_chordal_opts_t options = {
 157         BE_CH_DUMP_NONE,
 158         BE_CH_SPILL_BELADY,
 159         BE_CH_COPYMIN_HEUR,
 160         BE_CH_IFG_STD,
 161         BE_CH_LOWER_PERM_SWAP
 162 };
 163
 164 #ifdef WITH_LIBCORE
 165 static const lc_opt_enum_int_items_t spill_items[] = {
 166         { "belady", BE_CH_SPILL_BELADY },
 167         { "ilp",        BE_CH_SPILL_ILP },
 168         { NULL, 0 }
 169 };
 170
 171 static const lc_opt_enum_int_items_t copymin_items[] = {
 172         { "heur", BE_CH_COPYMIN_HEUR },
 173         { "ilp",  BE_CH_COPYMIN_ILP },
 174         { NULL, 0 }
 175 };
 176
 177 static const lc_opt_enum_int_items_t ifg_flavor_items[] = {
 178         { "std",  BE_CH_IFG_STD },
 179         { "fast", BE_CH_IFG_FAST },
 180         { NULL, 0 }
 181 };
 182
 183 static const lc_opt_enum_int_items_t lower_perm_items[] = {
 184         { "swap", BE_CH_LOWER_PERM_SWAP },
 185         { "copy", BE_CH_LOWER_PERM_COPY },
 186         { NULL, 0 }
 187 };
 188
 189 static const lc_opt_enum_int_items_t dump_items[] = {
 190         { "spill",    BE_CH_DUMP_SPILL },
 191         { "live",     BE_CH_DUMP_LIVE },
 192         { "color",    BE_CH_DUMP_COLOR },
 193         { "copymin",  BE_CH_DUMP_COPYMIN },
 194         { "ssadestr", BE_CH_DUMP_SSADESTR },
 195         { "tree",     BE_CH_DUMP_TREE_INTV },
 196         { "constr",   BE_CH_DUMP_CONSTR },
 197         { "lower",    BE_CH_DUMP_LOWER },
 198         { NULL, 0 }
 199 };
 200
 201 static lc_opt_enum_int_var_t spill_var = {
 202         &options.spill_method, spill_items
 203 };
 204
 205 static lc_opt_enum_int_var_t copymin_var = {
 206         &options.copymin_method, copymin_items
 207 };
 208
 209 static lc_opt_enum_int_var_t ifg_flavor_var = {
 210         &options.spill_method, ifg_flavor_items
 211 };
 212
 213 static lc_opt_enum_int_var_t lower_perm_var = {
 214         &options.lower_perm_method, lower_perm_items
 215 };
 216
 217 static lc_opt_enum_int_var_t dump_var = {
 218         &options.dump_flags, dump_items
 219 };
 220
 221 static void be_ra_chordal_register_options(lc_opt_entry_t *grp)
 222 {
 223         grp = lc_opt_get_grp(grp, "chordal");
 224 }
 225 #endif
 226
 227 static void dump(unsigned mask, ir_graph *irg,
 228                                  const arch_register_class_t *cls,
 229                                  const char *suffix,
 230                                  void (*dump_func)(ir_graph *, const char *))
 231 {
 232         if(1 || (options.dump_flags & mask) == mask) {
 233                 if(cls) {
 234                         char buf[256];
 235                         snprintf(buf, sizeof(buf), "-%s%s", cls->name, suffix);
 236                         dump_func(irg, buf);
 237                 }
 238
 239                 else
 240                         dump_func(irg, suffix);
 241         }
 242 }
 243
 244 static void be_ra_chordal_main(const be_irg_t *bi)
 245 {
 246         int j, m;
 247         be_chordal_env_t chordal_env;
 248         ir_graph *irg = bi->irg;
 249         const be_main_env_t *main_env = bi->main_env;
 250         const arch_isa_t *isa = arch_env_get_isa(main_env->arch_env);
 251
 252         compute_doms(irg);
 253
 254         chordal_env.irg          = irg;
 255         chordal_env.dbg          = firm_dbg_register("firm.be.chordal");
 256         chordal_env.main_env     = main_env;
 257         chordal_env.dom_front    = be_compute_dominance_frontiers(irg);
 258
 259         obstack_init(&chordal_env.obst);
 260
 261         /* Perform the following for each register class. */
 262         for(j = 0, m = arch_isa_get_n_reg_class(isa); j < m; ++j) {
 263                 chordal_env.cls          = arch_isa_get_reg_class(isa, j);
 264                 chordal_env.border_heads = pmap_create();
 265
 266                 be_liveness(irg);
 267                 dump(BE_CH_DUMP_LIVE, irg, chordal_env.cls, "-live", dump_ir_block_graph_sched);
 268
 269                 /* spilling */
 270                 switch(options.spill_method) {
 271                 case BE_CH_SPILL_BELADY:
 272                         be_spill_belady(&chordal_env);
 273                         break;
 274                 case BE_CH_SPILL_ILP:
 275                         be_spill_ilp(&chordal_env);
 276                         break;
 277                 default:
 278                         fprintf(stderr, "no valid spiller selected. falling back to belady\n");
 279                         be_spill_belady(&chordal_env);
 280                 }
 281                 dump(BE_CH_DUMP_SPILL, irg, chordal_env.cls, "-spill", dump_ir_block_graph_sched);
 282                 be_liveness(irg);
 283                 be_check_pressure(&chordal_env);
 284
 285                 be_liveness(irg);
 286                 be_check_pressure(&chordal_env);
 287
 288                 /* Color the graph. */
 289                 be_ra_chordal_color(&chordal_env);
 290                 dump(BE_CH_DUMP_CONSTR, irg, chordal_env.cls, "-color", dump_ir_block_graph_sched);
 291
 292                 /* Build the interference graph. */
 293                 chordal_env.ifg = be_ifg_std_new(&chordal_env);
 294                 be_ifg_check(chordal_env.ifg);
 295
 296                 /* copy minimization */
 297                 copystat_collect_cls(&chordal_env);
 298                 be_copy_opt(&chordal_env);
 299                 dump(BE_CH_DUMP_COPYMIN, irg, chordal_env.cls, "-copymin", dump_ir_block_graph_sched);
 300                 be_ra_chordal_check(&chordal_env);
 301
 302                 /* ssa destruction */
 303                 be_ssa_destruction(&chordal_env);
 304                 dump(BE_CH_DUMP_SSADESTR, irg, chordal_env.cls, "-ssadestr", dump_ir_block_graph_sched);
 305                 be_ssa_destruction_check(&chordal_env);
 306                 be_ra_chordal_check(&chordal_env);
 307
 308                 copystat_dump(irg);
 309
 310                 be_ifg_free(chordal_env.ifg);
 311
 312                 pmap_destroy(chordal_env.border_heads);
 313         }
 314
 315         be_compute_spill_offsets(&chordal_env);
 316
 317         dump(BE_CH_DUMP_LOWER, irg, NULL, "-spilloff", dump_ir_block_graph_sched);
 318
 319         lower_nodes_after_ra(&chordal_env, options.lower_perm_method == BE_CH_LOWER_PERM_COPY ? 1 : 0);
 320         dump(BE_CH_DUMP_LOWER, irg, NULL, "-belower-after-ra", dump_ir_block_graph_sched);
 321
 322         obstack_free(&chordal_env.obst, NULL);
 323         be_free_dominance_frontiers(chordal_env.dom_front);
 324 }
 325
 326 const be_ra_t be_ra_chordal_allocator = {
 327 #ifdef WITH_LIBCORE
 328         be_ra_chordal_register_options,
 329 #endif
 330         be_ra_chordal_main
 331 };