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

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief       Copy node statistics.
  23  * @author      Daniel Grund
  24  * @date        19.04.2005
  25  * @version     $Id$
  26  */
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <string.h>
  32
  33 #include "timing.h"
  34 #include "irgraph.h"
  35 #include "irgwalk.h"
  36 #include "irprog.h"
  37 #include "iredges_t.h"
  38 #include "phiclass.h"
  39 #include "irnodeset.h"
  40
  41 #include "bechordal_t.h"
  42 #include "beutil.h"
  43 #include "becopyopt_t.h"
  44 #include "becopystat.h"
  45 #include "beirg_t.h"
  46 #include "bemodule.h"
  47 #include "beintlive_t.h"
  48
  49 #define DEBUG_LVL SET_LEVEL_1
  50 DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
  51
  52 #define MAX_ARITY 20
  53 #define MAX_CLS_SIZE 20
  54 #define MAX_CLS_PHIS 20
  55
  56 /**
  57  * For an explanation of these values see the code of copystat_dump_pretty
  58  */
  59 enum vals_t {
  60         /* FROM HERE: PROBLEM CHARACTERIZATION */
  61
  62         I_ALL_NODES = 0,
  63         I_BLOCKS,
  64
  65         /* phi nodes */
  66         I_PHI_CNT,                      /* number of phi nodes */
  67         I_PHI_ARG_CNT,          /* number of arguments of phis */
  68         I_PHI_ARG_SELF,         /* number of arguments of phis being the phi itself */
  69         I_PHI_ARG_CONST,        /* number of arguments of phis being consts */
  70         I_PHI_ARG_PRED,         /* ... being defined in a cf-pred */
  71         I_PHI_ARG_GLOB,         /* ... being defined elsewhere */
  72         I_PHI_ARITY_S,
  73         I_PHI_ARITY_E    = I_PHI_ARITY_S+MAX_ARITY,
  74
  75         /* copy nodes */
  76         I_CPY_CNT,                      /* number of copynodes */
  77
  78         /* phi classes */
  79         I_CLS_CNT,                      /* number of phi classes */
  80         I_CLS_IF_FREE,          /* number of pc having no interference */
  81         I_CLS_IF_MAX,           /* number of possible interferences in all classes */
  82         I_CLS_IF_CNT,           /* number of actual interferences in all classes */
  83         I_CLS_SIZE_S,
  84         I_CLS_SIZE_E = I_CLS_SIZE_S+MAX_CLS_SIZE,
  85         I_CLS_PHIS_S,
  86         I_CLS_PHIS_E = I_CLS_PHIS_S+MAX_CLS_PHIS,
  87
  88         /* FROM HERE: RESULT VLAUES */
  89         /* all of them are external set */
  90
  91         /* ilp values */
  92         I_HEUR_TIME,            /* solving time in milli seconds */
  93         I_ILP_TIME,                     /* solving time in milli seconds */
  94         I_ILP_VARS,
  95         I_ILP_CSTR,
  96         I_ILP_ITER,                     /* number of simplex iterations */
  97
  98         /* copy instructions */
  99         I_COPIES_MAX,           /* max possible costs of copies*/
 100         I_COPIES_INIT,          /* number of copies in initial allocation */
 101         I_COPIES_HEUR,          /* number of copies after heuristic */
 102         I_COPIES_5SEC,          /* number of copies after ilp with max n sec */
 103         I_COPIES_30SEC,         /* number of copies after ilp with max n sec */
 104         I_COPIES_OPT,           /* number of copies after ilp */
 105         I_COPIES_IF,            /* number of copies inevitable due to root-arg-interf */
 106
 107         ASIZE
 108 };
 109
 110 /**
 111  * Holds current values. Values are added till next copystat_reset
 112  */
 113 int curr_vals[ASIZE];
 114
 115 static ir_nodeset_t *all_phi_nodes;
 116 static ir_nodeset_t *all_copy_nodes;
 117 static ir_graph *last_irg;
 118
 119 void be_init_copystat(void) {
 120         FIRM_DBG_REGISTER(dbg, "firm.be.copystat");
 121
 122         all_phi_nodes  = ir_nodeset_new(64);
 123         all_copy_nodes = ir_nodeset_new(64);
 124         memset(curr_vals, 0, sizeof(curr_vals));
 125 }
 126 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_copystat);
 127
 128 void be_quit_copystat(void) {
 129         ir_nodeset_del(all_phi_nodes);
 130         ir_nodeset_del(all_copy_nodes);
 131 }
 132 BE_REGISTER_MODULE_DESTRUCTOR(be_quit_copystat);
 133
 134 void copystat_reset(void) {
 135         be_quit_copystat();
 136         be_init_copystat();
 137 }
 138
 139 /**
 140  * Collect general data
 141  */
 142 static void irg_stat_walker(ir_node *node, void *env)
 143 {
 144         (void)env;
 145
 146         curr_vals[I_ALL_NODES]++; /* count all nodes */
 147
 148         if (is_Block(node)) /* count all blocks */
 149                 curr_vals[I_BLOCKS]++;
 150
 151         if (is_Reg_Phi(node)) /* collect phis */
 152                 ir_nodeset_insert(all_phi_nodes, node);
 153
 154         if (is_Perm_Proj(node))
 155                 ir_nodeset_insert(all_copy_nodes, node);
 156
 157         /* TODO: Add 2-Addr-Code nodes */
 158 }
 159
 160 static void copystat_collect_irg(ir_graph *irg)
 161 {
 162         irg_walk_graph(irg, irg_stat_walker, NULL, NULL);
 163         last_irg = irg;
 164 }
 165
 166 /**
 167  * @return 1 if the block at pos @p pos removed a critical edge
 168  *                 0 else
 169  */
 170 static INLINE int was_edge_critical(const ir_node *bl, int pos) {
 171         const ir_edge_t *edge;
 172         const ir_node *bl_at_pos, *bl_before;
 173         assert(is_Block(bl));
 174
 175         /* Does bl have several predecessors ?*/
 176         if (get_irn_arity(bl) <= 1)
 177                 return 0;
 178
 179         /* Does the pred have exactly one predecessor */
 180         bl_at_pos = get_irn_n(bl, pos);
 181         if (get_irn_arity(bl_at_pos) != 1)
 182                 return 0;
 183
 184         /* Does the pred of the pred have several successors */
 185         bl_before = get_irn_n(bl_at_pos, 0);
 186         edge = get_block_succ_first(bl_before);
 187         return get_block_succ_next(bl_before, edge) ? 1 : 0;
 188 }
 189
 190 /**
 191  * Collect phi node data
 192  */
 193 static void stat_phi_node(be_chordal_env_t *chordal_env, ir_node *phi)
 194 {
 195         int arity, i;
 196         ir_node *phi_bl;
 197         assert(is_Phi(phi));
 198         (void) chordal_env;
 199
 200         /* count all phi phis */
 201         curr_vals[I_PHI_CNT]++;
 202
 203         /* argument count */
 204         arity = get_irn_arity(phi);
 205         curr_vals[I_PHI_ARG_CNT] += arity;
 206         if (arity > MAX_ARITY)
 207                 curr_vals[I_PHI_ARITY_E]++;
 208         else
 209                 curr_vals[I_PHI_ARITY_S + arity]++;
 210
 211         phi_bl = get_nodes_block(phi);
 212         /* type of argument {self, const, pred, glob} */
 213         for (i = 0; i < arity; i++) {
 214         ir_node *block_of_arg, *block_ith_pred;
 215                 ir_node *arg = get_irn_n(phi, i);
 216
 217                 if (arg == phi) {
 218                         curr_vals[I_PHI_ARG_SELF]++;
 219                         continue;
 220                 }
 221
 222                 if (iro_Const == get_irn_opcode(arg)) {
 223                         curr_vals[I_PHI_ARG_CONST]++;
 224                         continue;
 225                 }
 226
 227                 /* get the pred block skipping blocks on critical edges */
 228                 block_ith_pred = get_Block_cfgpred_block(phi_bl, i);
 229                 if (was_edge_critical(phi_bl, i))
 230                         block_ith_pred = get_Block_cfgpred_block(block_ith_pred, 0);
 231
 232                 block_of_arg = get_nodes_block(arg);
 233                 if (block_of_arg == block_ith_pred) {
 234                         curr_vals[I_PHI_ARG_PRED]++;
 235                         continue;
 236                 }
 237
 238                 curr_vals[I_PHI_ARG_GLOB]++;
 239         }
 240 }
 241
 242 /**
 243  * Collect register-constrained node data
 244  */
 245 static void stat_copy_node(be_chordal_env_t *chordal_env, ir_node *root) {
 246         curr_vals[I_CPY_CNT]++;
 247         curr_vals[I_COPIES_MAX]++;
 248         if (values_interfere(chordal_env->birg, root, get_Perm_src(root))) {
 249                 curr_vals[I_COPIES_IF]++;
 250                 assert(0 && "A Perm pair (in/out) should never interfere!");
 251         }
 252 }
 253
 254 /**
 255  * Collect phi class data
 256  */
 257 static void stat_phi_class(be_chordal_env_t *chordal_env, ir_node **pc) {
 258         int i, o, size, if_free, phis;
 259
 260         /* phi class count */
 261         curr_vals[I_CLS_CNT]++;
 262
 263         /* phi class size */
 264         size = ARR_LEN(pc);
 265         if (size > MAX_CLS_SIZE)
 266                 curr_vals[I_CLS_SIZE_E]++;
 267         else
 268                 curr_vals[I_CLS_SIZE_S + size]++;
 269
 270         /* determine number of phis on this class */
 271         for (phis = i = 0; i < size; ++i)
 272                 if (is_Phi(pc[i]))
 273                         phis++;
 274
 275         if (phis > MAX_CLS_PHIS)
 276                 curr_vals[I_CLS_PHIS_E]++;
 277         else
 278                 curr_vals[I_CLS_PHIS_S + phis]++;
 279
 280         /* determine interference of phi class members */
 281         curr_vals[I_CLS_IF_MAX] += size * (size - 1) / 2;
 282         for (if_free = 1, i = 0; i < size - 1; ++i)
 283                 for (o = i + 1; o < size; ++o)
 284                         if (values_interfere(chordal_env->birg, pc[i], pc[o])) {
 285                                 if_free = 0;
 286                                 curr_vals[I_CLS_IF_CNT]++;
 287                         }
 288
 289         /* Does this phi class have an inner interference? */
 290         curr_vals[I_CLS_IF_FREE] += if_free;
 291 }
 292
 293 static void copystat_collect_cls(be_chordal_env_t *cenv) {
 294         ir_graph              *irg  = cenv->irg;
 295         ir_node               *n, **pc;
 296         phi_classes_t         *pc_obj;
 297         pset                  *all_phi_classes;
 298         ir_nodeset_iterator_t iter;
 299
 300         copystat_reset();
 301         copystat_collect_irg(irg);
 302
 303         /* compute the Phi classes of the collected Phis */
 304         pc_obj          = phi_class_new_from_set(cenv->irg, all_phi_nodes, 0);
 305         all_phi_classes = get_all_phi_classes(pc_obj);
 306
 307         foreach_ir_nodeset(all_phi_nodes, n, iter) {
 308                 if (arch_get_irn_reg_class(n, -1) == cenv->cls)
 309                         stat_phi_node(cenv, n);
 310         }
 311
 312         foreach_ir_nodeset(all_copy_nodes, n, iter) {
 313                 if (arch_get_irn_reg_class(n, -1) == cenv->cls)
 314                         stat_copy_node(cenv, n);
 315         }
 316
 317         foreach_pset(all_phi_classes, pc) {
 318                 ir_node *member = pc[0];
 319                 if (arch_get_irn_reg_class(member, -1) == cenv->cls)
 320                         stat_phi_class(cenv, pc);
 321         }
 322
 323         /* free the phi class object */
 324         phi_class_free(pc_obj);
 325 }
 326
 327 void copystat_add_max_costs(int costs) {
 328         curr_vals[I_COPIES_MAX] += costs;
 329 }
 330 void copystat_add_inevit_costs(int costs) {
 331         curr_vals[I_COPIES_IF] += costs;
 332 }
 333 void copystat_add_init_costs(int costs) {
 334         curr_vals[I_COPIES_INIT] += costs;
 335 }
 336 void copystat_add_heur_costs(int costs) {
 337         curr_vals[I_COPIES_HEUR] += costs;
 338 }
 339 void copystat_add_ilp_5_sec_costs(int costs) {
 340         curr_vals[I_COPIES_5SEC] += costs;
 341 }
 342 void copystat_add_ilp_30_sec_costs(int costs) {
 343         curr_vals[I_COPIES_30SEC] += costs;
 344 }
 345 void copystat_add_opt_costs(int costs) {
 346         curr_vals[I_COPIES_OPT] += costs;
 347 }
 348 void copystat_add_heur_time(int time) {
 349         curr_vals[I_HEUR_TIME] += time;
 350 }
 351
 352 #ifdef WITH_ILP
 353
 354 void copystat_add_ilp_time(int time) {
 355         curr_vals[I_ILP_TIME] += time;
 356 }
 357 void copystat_add_ilp_vars(int vars) {
 358         curr_vals[I_ILP_VARS] += vars;
 359 }
 360 void copystat_add_ilp_csts(int csts) {
 361         curr_vals[I_ILP_CSTR] += csts;
 362 }
 363 void copystat_add_ilp_iter(int iters) {
 364         curr_vals[I_ILP_ITER] += iters;
 365 }
 366
 367 #endif /* WITH_ILP */
 368
 369 void copystat_dump(ir_graph *irg) {
 370         int i;
 371         char buf[1024];
 372         FILE *out;
 373
 374         snprintf(buf, sizeof(buf), "%s__%s", get_irp_prog_name(), get_entity_name(get_irg_entity(irg)));
 375         buf[sizeof(buf) - 1] = '\0';
 376         out = be_ffopen(buf, "stat", "wt");
 377
 378         fprintf(out, "%d\n", ASIZE);
 379         for (i = 0; i < ASIZE; i++) {
 380 #if 0
 381                 if (i >= I_PHI_ARITY_S && i <= I_PHI_ARITY_E)
 382                         fprintf(out, "%i %i\n", curr_vals[i], curr_vals[I_PHI_CNT]);
 383                 else if (i >= I_CLS_SIZE_S && i <= I_CLS_SIZE_E)
 384                         fprintf(out, "%i %i\n", curr_vals[i], curr_vals[I_CLS_CNT]);
 385                 else
 386 #endif
 387                         fprintf(out, "%i\n", curr_vals[i]);
 388         }
 389
 390         fclose(out);
 391 }
 392
 393 void copystat_dump_pretty(ir_graph *irg) {
 394         int i;
 395         char buf[1024];
 396         FILE *out;
 397
 398         snprintf(buf, sizeof(buf), "%s__%s", get_irp_prog_name(), get_entity_name(get_irg_entity(irg)));
 399         buf[sizeof(buf) - 1] = '\0';
 400         out = be_ffopen(buf, "pstat", "wt");
 401
 402         fprintf(out, "Nodes     %4d\n", curr_vals[I_ALL_NODES]);
 403         fprintf(out, "Blocks    %4d\n", curr_vals[I_BLOCKS]);
 404         fprintf(out, "CopyIrn   %4d\n", curr_vals[I_CPY_CNT]);
 405
 406         fprintf(out, "\nPhis      %4d\n", curr_vals[I_PHI_CNT]);
 407         fprintf(out, "... argument types\n");
 408         fprintf(out, " Total      %4d\n", curr_vals[I_PHI_ARG_CNT]);
 409         fprintf(out, " Self       %4d\n", curr_vals[I_PHI_ARG_SELF]);
 410         fprintf(out, " Constants  %4d\n", curr_vals[I_PHI_ARG_CONST]);
 411         fprintf(out, " CF-Pred    %4d\n", curr_vals[I_PHI_ARG_PRED]);
 412         fprintf(out, " Others     %4d\n", curr_vals[I_PHI_ARG_GLOB]);
 413         fprintf(out, "... arities\n");
 414         for (i = I_PHI_ARITY_S; i<=I_PHI_ARITY_E; i++)
 415                 fprintf(out, " %2i %4d\n", i-I_PHI_ARITY_S, curr_vals[i]);
 416
 417         fprintf(out, "\nPhi classes   %4d\n", curr_vals[I_CLS_CNT]);
 418         fprintf(out, " compl. free  %4d\n", curr_vals[I_CLS_IF_FREE]);
 419         fprintf(out, " inner intf.  %4d / %4d\n", curr_vals[I_CLS_IF_CNT], curr_vals[I_CLS_IF_MAX]);
 420         fprintf(out, "... sizes\n");
 421         for (i = I_CLS_SIZE_S; i<=I_CLS_SIZE_E; i++)
 422                 fprintf(out, " %2i %4d\n", i-I_CLS_SIZE_S, curr_vals[i]);
 423         fprintf(out, "... contained phis\n");
 424         for (i = I_CLS_PHIS_S; i<=I_CLS_PHIS_E; i++)
 425                 fprintf(out, " %2i %4d\n", i-I_CLS_PHIS_S, curr_vals[i]);
 426
 427         fprintf(out, "\nILP stat\n");
 428         fprintf(out, " Time %8d\n", curr_vals[I_ILP_TIME]);
 429         fprintf(out, " Iter %8d\n", curr_vals[I_ILP_ITER]);
 430
 431         fprintf(out, "\nCopy stat\n");
 432         fprintf(out, " Max  %4d\n", curr_vals[I_COPIES_MAX]);
 433         fprintf(out, " Init %4d\n", curr_vals[I_COPIES_INIT]);
 434         fprintf(out, " Heur %4d\n", curr_vals[I_COPIES_HEUR]);
 435         fprintf(out, " Opt  %4d\n", curr_vals[I_COPIES_OPT]);
 436         fprintf(out, " Intf %4d\n", curr_vals[I_COPIES_IF]);
 437
 438         fclose(out);
 439 }
 440
 441 /**
 442  * Helpers for saving and restoring colors of nodes.
 443  * Used to get dependable and comparable benchmark results.
 444  */
 445 typedef struct color_saver {
 446         be_chordal_env_t *chordal_env;
 447         pmap *saved_colors;
 448         int flag; /* 0 save, 1 load */
 449 } color_save_t;
 450
 451 static void save_load(ir_node *irn, void *env) {
 452         color_save_t *saver = env;
 453         if (saver->chordal_env->cls == arch_get_irn_reg_class(irn, -1)) {
 454                 if (saver->flag == 0) { /* save */
 455                         const arch_register_t *reg = arch_get_irn_register(irn);
 456                         pmap_insert(saver->saved_colors, irn, (void *) reg);
 457                 } else { /*load */
 458                         arch_register_t *reg = pmap_get(saver->saved_colors, irn);
 459                         arch_set_irn_register(irn, reg);
 460                 }
 461         }
 462 }
 463
 464 static void save_colors(color_save_t *color_saver) {
 465         color_saver->flag = 0;
 466         irg_walk_graph(color_saver->chordal_env->irg, save_load, NULL, color_saver);
 467 }
 468
 469 #ifdef WITH_ILP
 470 static void load_colors(color_save_t *color_saver) {
 471         color_saver->flag = 1;
 472         irg_walk_graph(color_saver->chordal_env->irg, save_load, NULL, color_saver);
 473 }
 474 #endif
 475
 476 /**
 477  * Main compare routine
 478  */
 479 void co_compare_solvers(be_chordal_env_t *chordal_env) {
 480         copy_opt_t    *co;
 481         ir_timer_t    *timer;
 482         color_save_t  saver;
 483         int costs_inevit, costs_init, costs_solved, lower_bound;
 484
 485         copystat_collect_cls(chordal_env);
 486
 487         co = new_copy_opt(chordal_env, co_get_costs_loop_depth);
 488         co_build_ou_structure(co);
 489         co_build_graph_structure(co);
 490         DBG((dbg, LEVEL_1, "----> CO: %s\n", co->name));
 491
 492         /* save colors */
 493         saver.chordal_env  = chordal_env;
 494         saver.saved_colors = pmap_create();
 495         save_colors(&saver);
 496
 497         /* initial values */
 498         costs_inevit = co_get_inevit_copy_costs(co);
 499         lower_bound  = co_get_lower_bound(co);
 500         costs_init   = co_get_copy_costs(co);
 501
 502         DBG((dbg, LEVEL_1, "Inevit Costs: %3d\n", costs_inevit));
 503         DBG((dbg, LEVEL_1, "Lower Bound: %3d\n", lower_bound));
 504         DBG((dbg, LEVEL_1, "Init costs: %3d\n", costs_init));
 505
 506         copystat_add_inevit_costs(costs_inevit);
 507         copystat_add_init_costs(costs_init);
 508         copystat_add_max_costs(co_get_max_copy_costs(co));
 509
 510         /* heuristic 1 (Daniel Grund) */
 511         timer = ir_timer_register("heur1", NULL);
 512         ir_timer_reset_and_start(timer);
 513
 514         co_solve_heuristic(co);
 515
 516         ir_timer_stop(timer);
 517
 518         costs_solved = co_get_copy_costs(co);
 519         DBG((dbg, LEVEL_1, "HEUR1 costs: %3d\n", costs_solved));
 520         copystat_add_heur_time(ir_timer_elapsed_msec(timer));
 521         copystat_add_heur_costs(costs_solved);
 522         assert(lower_bound <= costs_solved);
 523
 524         /* heuristic 2 (Sebastian Hack) */
 525         timer = ir_timer_register("heur2", NULL);
 526         ir_timer_reset_and_start(timer);
 527
 528         co_solve_heuristic_new(co);
 529
 530         ir_timer_stop(timer);
 531
 532         costs_solved = co_get_copy_costs(co);
 533         DBG((dbg, LEVEL_1, "HEUR2 costs: %3d\n", costs_solved));
 534         copystat_add_heur_time(ir_timer_elapsed_msec(timer));
 535         copystat_add_heur_costs(costs_solved);
 536         assert(lower_bound <= costs_solved);
 537
 538         /* Park & Moon register coalescing (Kimon Hoffmann) */
 539         timer = ir_timer_register("park", NULL);
 540         ir_timer_reset_and_start(timer);
 541
 542         co_solve_park_moon(co);
 543
 544         ir_timer_stop(timer);
 545
 546         costs_solved = co_get_copy_costs(co);
 547         DBG((dbg, LEVEL_1, "Park/Moon costs: %3d\n", costs_solved));
 548         copystat_add_heur_time(ir_timer_elapsed_msec(timer));
 549         copystat_add_heur_costs(costs_solved);
 550         assert(lower_bound <= costs_solved);
 551
 552
 553 #ifdef WITH_ILP
 554
 555         /* ILP 1 is not yet implemented, so it makes no sense to compare */
 556 #if 0
 557         load_colors(&saver);
 558
 559         co_solve_ilp1(co, 60.0);
 560
 561         costs_solved = co_get_copy_costs(co);
 562         DBG((dbg, LEVEL_1, "ILP1 costs: %3d\n", costs_solved));
 563         copystat_add_opt_costs(costs_solved); /* TODO: ADAPT */
 564         assert(lower_bound <= costs_solved);
 565 #endif /* 0 */
 566
 567         /* ILP 2 */
 568         load_colors(&saver);
 569
 570         co_solve_ilp2(co);
 571
 572         costs_solved = co_get_copy_costs(co);
 573         DBG((dbg, LEVEL_1, "ILP2 costs: %3d\n", costs_solved));
 574         copystat_add_opt_costs(costs_solved); /* TODO: ADAPT */
 575         assert(lower_bound <= costs_solved);
 576
 577 #endif /* WITH_ILP */
 578
 579         /* free memory for statistic structures */
 580         pmap_destroy(saver.saved_colors);
 581         co_free_graph_structure(co);
 582         co_free_ou_structure(co);
 583         free_copy_opt(co);
 584 }