nsz Git - libfirm/blob - ir/ir/irprofile.c

   1 /*
   2  * Copyright (C) 1995-2007 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       Code instrumentation and execution count profiling.
  23  * @author      Adam M. Szalkowski
  24  * @date        06.04.2006
  25  * @version     $Id$
  26  */
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <math.h>
  32
  33 #include "hashptr.h"
  34 #include "debug.h"
  35 #include "obst.h"
  36 #include "set.h"
  37 #include "list.h"
  38 #include "pmap.h"
  39
  40 #include "irprintf.h"
  41 #include "irgwalk.h"
  42 #include "irdump_t.h"
  43 #include "irnode_t.h"
  44 #include "ircons_t.h"
  45 #include "execfreq.h"
  46 #include "typerep.h"
  47
  48 #include "dbginfo.h"
  49 #include "irhooks.h"
  50 #include "iredges.h"
  51
  52 #include "irprofile.h"
  53
  54 /** An entry in the id-to-location map */
  55 typedef struct loc_entry {
  56         ir_entity    *fname;   /**< the entity holding the file name */
  57         unsigned int lineno;   /**< line number */
  58 } loc_entry;
  59
  60 typedef struct _block_id_walker_data_t {
  61         tarval         **array;    /**< the entity the holds the block counts */
  62         unsigned int   id;         /**< current block id number */
  63         ir_node        *symconst;  /**< the SymConst representing array */
  64         pmap           *fname_map; /**< set containing all found filenames */
  65         loc_entry      *locs;      /**< locations */
  66         ir_type        *tp_char;   /**< the character type */
  67         unsigned       flags;      /**< profile flags */
  68 } block_id_walker_data_t;
  69
  70 typedef struct _execcount_t {
  71         unsigned long block;
  72         unsigned int count;
  73 } execcount_t;
  74
  75 /**
  76  * Compare two execcount_t entries.
  77  */
  78 static int cmp_execcount(const void *a, const void *b, size_t size) {
  79         const execcount_t *ea = a;
  80         const execcount_t *eb = b;
  81         (void) size;
  82         return ea->block != eb->block;
  83 }
  84
  85 /**
  86  * Block walker, count number of blocks.
  87  */
  88 static void block_counter(ir_node * bb, void * data) {
  89         unsigned int *count = data;
  90         (void) bb;
  91         *count = *count + 1;
  92 }
  93
  94 /**
  95  * Return the number of blocks the given graph.
  96  */
  97 static unsigned int count_blocks(ir_graph *irg) {
  98         unsigned int count = 0;
  99
 100         irg_block_walk_graph(irg, block_counter, NULL, &count);
 101         return count;
 102 }
 103
 104 /* keep the execcounts here because they are only read once per compiler run */
 105 static set * profile = NULL;
 106 static hook_entry_t hook;
 107
 108 /**
 109  * Instrument a block with code needed for profiling
 110  */
 111 static void
 112 instrument_block(ir_node *bb, ir_node *address, unsigned int id)
 113 {
 114         ir_graph *irg = get_irn_irg(bb);
 115         ir_node  *start_block = get_irg_start_block(irg);
 116         ir_node  *load, *store, *offset, *add, *projm, *proji, *unknown;
 117         ir_node  *cnst;
 118
 119         /**
 120          * We can't instrument the end block as there are no real instructions there
 121          */
 122         if(bb == get_irg_end_block(irg))
 123                 return;
 124
 125         unknown = new_r_Unknown(irg, mode_M);
 126         cnst    = new_r_Const_long(irg, start_block, mode_Iu, get_mode_size_bytes(mode_Iu) * id);
 127         offset  = new_r_Add(irg, bb, address, cnst, mode_P);
 128         load    = new_r_Load(irg, bb, unknown, offset, mode_Iu);
 129         projm   = new_r_Proj(irg, bb, load, mode_M, pn_Load_M);
 130         proji   = new_r_Proj(irg, bb, load, mode_Iu, pn_Load_res);
 131         cnst    = new_r_Const_long(irg, start_block, mode_Iu, 1);
 132         add     = new_r_Add(irg, bb, proji, cnst, mode_Iu);
 133         store   = new_r_Store(irg, bb, projm, offset, add);
 134         projm   = new_r_Proj(irg, bb, store, mode_M, pn_Store_M);
 135         set_irn_link(bb, projm);
 136         set_irn_link(projm, load);
 137 }
 138
 139 typedef struct fix_env {
 140         ir_node *end_block;
 141 } fix_env;
 142
 143 /**
 144  * SSA Construction for instrumentation code memory
 145  */
 146 static void
 147 fix_ssa(ir_node * bb, void * data)
 148 {
 149         fix_env *env = data;
 150         ir_node *mem;
 151         int     arity = get_Block_n_cfgpreds(bb);
 152
 153         /* start and end block are not instrumented, skip! */
 154         if (bb == env->end_block)
 155                 return;
 156
 157         if (bb == get_irg_start_block(get_irn_irg(bb))) {
 158                 mem = new_NoMem();
 159         } else if (arity == 1) {
 160                 mem = get_irn_link(get_Block_cfgpred_block(bb, 0));
 161         } else {
 162                 int n;
 163                 ir_node **ins;
 164                 ir_graph *irg = current_ir_graph;
 165
 166                 NEW_ARR_A(ir_node*, ins, arity);
 167                 for (n = arity - 1; n >= 0; --n) {
 168                         ins[n] = get_irn_link(get_Block_cfgpred_block(bb, n));
 169                 }
 170                 mem = new_r_Phi(irg, bb, arity, ins, mode_M);
 171         }
 172         set_Load_mem(get_irn_link(get_irn_link(bb)), mem);
 173 }
 174
 175
 176 /**
 177  * Generates a new irg which calls the initializer
 178  *
 179  * Pseudocode:
 180  *       void __firmprof_initializer(void) { __init_firmprof(ent_filename, bblock_id, bblock_counts, n_blocks); }
 181  */
 182 static ir_graph *
 183 gen_initializer_irg(ir_entity * ent_filename, ir_entity * bblock_id, ir_entity * bblock_counts, int n_blocks)
 184 {
 185         ir_node *start_block;
 186
 187         ir_node   *ins[4];
 188         ident     *name = new_id_from_str("__firmprof_initializer");
 189         ir_entity *ent  = new_entity(get_glob_type(), name, new_type_method(name, 0, 0));
 190         ir_node   *ret, *call, *symconst;
 191         symconst_symbol sym;
 192
 193         ident     *init_name = new_id_from_str("__init_firmprof");
 194         ir_type   *init_type = new_type_method(init_name, 4, 0);
 195         ir_type   *uint, *uintptr, *string;
 196         ir_entity *init_ent;
 197         ir_graph  *irg;
 198         ir_node   *bb;
 199         ir_type   *empty_frame_type;
 200
 201         set_entity_ld_ident(ent, name);
 202
 203         uint    = new_type_primitive(new_id_from_str("__uint"), mode_Iu);
 204         uintptr = new_type_pointer(new_id_from_str("__uintptr"), uint, mode_P);
 205         string  = new_type_pointer(new_id_from_str("__charptr"), new_type_primitive(new_id_from_str("__char"), mode_Bs), mode_P);
 206
 207         set_method_param_type(init_type, 0, string);
 208         set_method_param_type(init_type, 1, uintptr);
 209         set_method_param_type(init_type, 2, uintptr);
 210         set_method_param_type(init_type, 3, uint);
 211         init_ent = new_entity(get_glob_type(), init_name, init_type);
 212         set_entity_ld_ident(init_ent, init_name);
 213
 214         irg = new_ir_graph(ent, 0);
 215         empty_frame_type = get_irg_frame_type(irg);
 216         set_type_size_bytes(empty_frame_type, 0);
 217
 218         bb = get_cur_block();
 219
 220         start_block = get_irg_start_block(irg);
 221
 222         sym.entity_p = init_ent;
 223         symconst     = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 224
 225         sym.entity_p = ent_filename;
 226         ins[0] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 227         sym.entity_p = bblock_id;
 228         ins[1] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 229         sym.entity_p = bblock_counts;
 230         ins[2] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 231         ins[3] = new_r_Const_long(irg, start_block, mode_Iu, n_blocks);
 232
 233         call = new_r_Call(irg, bb, get_irg_initial_mem(irg), symconst, 4, ins, init_type);
 234         ret = new_r_Return(irg, bb, new_r_Proj(irg, bb, call, mode_M, pn_Call_M_regular), 0, NULL);
 235         mature_immBlock(bb);
 236
 237         add_immBlock_pred(get_irg_end_block(irg), ret);
 238         mature_immBlock(get_irg_end_block(irg));
 239
 240         irg_finalize_cons(irg);
 241
 242         return irg;
 243 }
 244
 245 /**
 246  * Create the location data for the given debug info.
 247  */
 248 static void create_location_data(dbg_info *dbg, block_id_walker_data_t *wd)
 249 {
 250         unsigned lineno;
 251         const char *fname = ir_retrieve_dbg_info(dbg, &lineno);
 252
 253         if (fname) {
 254                 pmap_entry *entry = pmap_find(wd->fname_map, (void *)fname);
 255                 ir_entity  *ent;
 256
 257                 if (! entry) {
 258                         static unsigned nr = 0;
 259                         ident   *id;
 260                         char    buf[128];
 261                         ir_type *arr;
 262                         int     i, len = strlen(fname) + 1;
 263                         tarval  **tarval_string;
 264
 265                         snprintf(buf, sizeof(buf), "firm_name_arr.%d", nr);
 266                         arr = new_type_array(new_id_from_str(buf), 1, wd->tp_char);
 267                         set_array_bounds_int(arr, 0, 0, len);
 268
 269                         snprintf(buf, sizeof(buf), "__firm_name.%d", nr++);
 270                         id = new_id_from_str(buf);
 271                         ent = new_entity(get_glob_type(), id, arr);
 272                         set_entity_ld_ident(ent, id);
 273
 274                         pmap_insert(wd->fname_map, (void *)fname, ent);
 275
 276                         /* initialize file name string constant */
 277                         tarval_string = alloca(sizeof(*tarval_string) * (len));
 278                         for (i = 0; i < len; ++i) {
 279                                 tarval_string[i] = new_tarval_from_long(fname[i], mode_Bs);
 280                         }
 281                         set_entity_variability(ent, variability_constant);
 282                         set_array_entity_values(ent, tarval_string, len);
 283                 } else {
 284                         ent = entry->value;
 285                 }
 286                 wd->locs[wd->id].fname  = ent;
 287                 wd->locs[wd->id].lineno = lineno;
 288         } else {
 289                 wd->locs[wd->id].fname  = NULL;
 290                 wd->locs[wd->id].lineno = 0;
 291         }
 292 }
 293
 294 /**
 295  * Walker: assigns an ID to every block.
 296  * Builds the string table
 297  */
 298 static void
 299 block_id_walker(ir_node * bb, void * data)
 300 {
 301         block_id_walker_data_t *wd = data;
 302
 303         wd->array[wd->id] = new_tarval_from_long(get_irn_node_nr(bb), mode_Iu);
 304         instrument_block(bb, wd->symconst, wd->id);
 305
 306         if (wd->flags & profile_with_locations) {
 307                 dbg_info *dbg = get_irn_dbg_info(bb);
 308                 create_location_data(dbg, wd);
 309         }
 310         ++wd->id;
 311 }
 312
 313 #define IDENT(x)        new_id_from_chars(x, sizeof(x) - 1)
 314
 315 ir_graph *
 316 ir_profile_instrument(const char *filename, unsigned flags)
 317 {
 318         int n, i;
 319         int n_blocks = 0;
 320         ir_entity *bblock_id;
 321         ir_entity *bblock_counts;
 322         ir_entity *ent_filename;
 323         ir_entity *ent_locations = NULL;
 324         ir_entity *loc_lineno = NULL;
 325         ir_entity *loc_name = NULL;
 326         ir_entity *ent;
 327         ir_type *array_type;
 328         ir_type *uint_type;
 329         ir_type *string_type;
 330         ir_type *character_type;
 331         ir_type *loc_type = NULL;
 332         ir_type *charptr_type;
 333         ir_type *gtp;
 334         ir_node *start_block;
 335         tarval **tarval_array;
 336         tarval **tarval_string;
 337         tarval *tv;
 338         int filename_len = strlen(filename)+1;
 339         ident *cur_ident;
 340         unsigned align_l, align_n, size;
 341         ir_graph *rem;
 342         block_id_walker_data_t  wd;
 343         symconst_symbol sym;
 344
 345         /* count the number of block first */
 346         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 347                 ir_graph *irg = get_irp_irg(n);
 348
 349                 n_blocks += count_blocks(irg);
 350         }
 351
 352         /* create all the necessary types and entities. Note that the
 353            types must have a fixed layout, because we already running in the
 354            backend */
 355         uint_type      = new_type_primitive(IDENT("__uint"), mode_Iu);
 356         set_type_alignment_bytes(uint_type, get_type_size_bytes(uint_type));
 357
 358         array_type     = new_type_array(IDENT("__block_info_array"), 1, uint_type);
 359         set_array_bounds_int(array_type, 0, 0, n_blocks);
 360         set_type_size_bytes(array_type, n_blocks * get_mode_size_bytes(mode_Iu));
 361         set_type_alignment_bytes(array_type, get_mode_size_bytes(mode_Iu));
 362         set_type_state(array_type, layout_fixed);
 363
 364         character_type = new_type_primitive(IDENT("__char"), mode_Bs);
 365         string_type    = new_type_array(IDENT("__filename"), 1, character_type);
 366         set_array_bounds_int(string_type, 0, 0, filename_len);
 367         set_type_size_bytes(string_type, filename_len);
 368         set_type_alignment_bytes(string_type, 1);
 369         set_type_state(string_type, layout_fixed);
 370
 371         gtp            = get_glob_type();
 372
 373         cur_ident      = IDENT("__FIRMPROF__BLOCK_IDS");
 374         bblock_id      = new_entity(gtp, cur_ident, array_type);
 375         set_entity_ld_ident(bblock_id, cur_ident);
 376         set_entity_variability(bblock_id, variability_initialized);
 377
 378         cur_ident      = IDENT("__FIRMPROF__BLOCK_COUNTS");
 379         bblock_counts  = new_entity(gtp, cur_ident, array_type);
 380         set_entity_ld_ident(bblock_counts, cur_ident);
 381         set_entity_variability(bblock_counts, variability_initialized);
 382
 383         cur_ident      = IDENT("__FIRMPROF__FILE_NAME");
 384         ent_filename   = new_entity(gtp, cur_ident, string_type);
 385         set_entity_ld_ident(ent_filename, cur_ident);
 386
 387         if (flags & profile_with_locations) {
 388                 loc_type       = new_type_struct(IDENT("__location"));
 389                 loc_lineno     = new_entity(loc_type, IDENT("lineno"), uint_type);
 390                 align_l        = get_type_alignment_bytes(uint_type);
 391                 size           = get_type_size_bytes(uint_type);
 392                 set_entity_offset(loc_lineno, 0);
 393
 394                 charptr_type   = new_type_pointer(IDENT("__charptr"), character_type, mode_P_data);
 395                 align_n        = get_type_size_bytes(charptr_type);
 396                 set_type_alignment_bytes(charptr_type, align_n);
 397                 loc_name       = new_entity(loc_type, IDENT("name"), charptr_type);
 398                 size           = (size + align_n - 1) & ~(align_n - 1);
 399                 set_entity_offset(loc_name, size);
 400                 size          += align_n;
 401
 402                 if (align_n > align_l)
 403                         align_l = align_n;
 404                 size = (size + align_l - 1) & ~(align_l - 1);
 405                 set_type_size_bytes(loc_type, size);
 406                 set_type_state(loc_type, layout_fixed);
 407
 408                 loc_type = new_type_array(IDENT("__locarray"), 1, loc_type);
 409                 set_array_bounds_int(string_type, 0, 0, n_blocks);
 410
 411                 cur_ident      = IDENT("__FIRMPROF__LOCATIONS");
 412                 ent_locations   = new_entity(gtp, cur_ident, loc_type);
 413                 set_entity_ld_ident(ent_locations, cur_ident);
 414         }
 415
 416         /* initialize count array */
 417         NEW_ARR_A(tarval *, tarval_array, n_blocks);
 418         tv = get_tarval_null(mode_Iu);
 419         for (i = 0; i < n_blocks; ++i) {
 420                 tarval_array[i] = tv;
 421         }
 422         set_array_entity_values(bblock_counts, tarval_array, n_blocks);
 423
 424         /* initialize function name string constant */
 425         tarval_string = alloca(sizeof(*tarval_string) * (filename_len));
 426         for (i = 0; i < filename_len; ++i) {
 427                 tarval_string[i] = new_tarval_from_long(filename[i], mode_Bs);
 428         }
 429         set_entity_variability(ent_filename, variability_constant);
 430         set_array_entity_values(ent_filename, tarval_string, filename_len);
 431
 432         /* initialize block id array and instrument blocks */
 433         wd.array     = tarval_array;
 434         wd.id        = 0;
 435         wd.tp_char   = character_type;
 436         wd.flags     = flags;
 437         if (flags & profile_with_locations) {
 438                 wd.fname_map = pmap_create();
 439                 NEW_ARR_A(loc_entry, wd.locs, n_blocks);
 440         }
 441
 442         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 443                 ir_graph      *irg = get_irp_irg(n);
 444                 int            i;
 445                 ir_node       *endbb = get_irg_end_block(irg);
 446                 fix_env       env;
 447
 448                 set_current_ir_graph(irg);
 449
 450                 /* generate a symbolic constant pointing to the count array */
 451                 sym.entity_p = bblock_counts;
 452                 wd.symconst  = new_r_SymConst(irg, get_irg_start_block(irg), sym, symconst_addr_ent);
 453
 454                 irg_block_walk_graph(irg, block_id_walker, NULL, &wd);
 455                 start_block = get_irg_start_block(irg);
 456                 env.end_block   = get_irg_end_block(irg);
 457                 irg_block_walk_graph(irg, fix_ssa, NULL, &env);
 458                 for (i = get_Block_n_cfgpreds(endbb) - 1; i >= 0; --i) {
 459                         ir_node *node = skip_Proj(get_Block_cfgpred(endbb, i));
 460                         ir_node *bb   = get_Block_cfgpred_block(endbb, i);
 461                         ir_node *sync;
 462                         ir_node *ins[2];
 463
 464                         switch (get_irn_opcode(node)) {
 465                         case iro_Return:
 466                                 ins[0] = get_irn_link(bb);
 467                                 ins[1] = get_Return_mem(node);
 468                                 sync   = new_r_Sync(irg, bb, 2, ins);
 469                                 set_Return_mem(node, sync);
 470                                 break;
 471                         case iro_Raise:
 472                                 ins[0] = get_irn_link(bb);
 473                                 ins[1] = get_Raise_mem(node);
 474                                 sync   = new_r_Sync(irg, bb, 2, ins);
 475                                 set_Raise_mem(node, sync);
 476                                 break;
 477                         default:
 478                                 /* a fragile's op exception. There should be another path to End,
 479                                    so ignore it */
 480                                 assert(is_fragile_op(node) && "unexpected End control flow predecessor");
 481                         }
 482                 }
 483         }
 484         set_array_entity_values(bblock_id, tarval_array, n_blocks);
 485
 486         if (flags & profile_with_locations) {
 487                 /* build the initializer for the locations */
 488                 rem = current_ir_graph;
 489                 current_ir_graph = get_const_code_irg();
 490                 ent = get_array_element_entity(loc_type);
 491                 set_entity_variability(ent_locations, variability_constant);
 492                 for (i = 0; i < n_blocks; ++i) {
 493                         compound_graph_path *path;
 494                         tarval *tv;
 495                         ir_node *n;
 496
 497                         /* lineno */
 498                         path = new_compound_graph_path(loc_type, 2);
 499                         set_compound_graph_path_array_index(path, 0, i);
 500                         set_compound_graph_path_node(path, 0, ent);
 501                         set_compound_graph_path_node(path, 1, loc_lineno);
 502                         tv = new_tarval_from_long(wd.locs[i].lineno, mode_Iu);
 503                         add_compound_ent_value_w_path(ent_locations, new_Const(mode_Iu, tv), path);
 504
 505                         /* name */
 506                         path = new_compound_graph_path(loc_type, 2);
 507                         set_compound_graph_path_array_index(path, 0, i);
 508                         set_compound_graph_path_node(path, 0, ent);
 509                         set_compound_graph_path_node(path, 1, loc_name);
 510                         if (wd.locs[i].fname) {
 511                                 sym.entity_p = wd.locs[i].fname;
 512                                 n = new_SymConst(sym, symconst_addr_ent);
 513                         } else {
 514                                 n = new_Const(mode_P_data, get_mode_null(mode_P_data));
 515                         }
 516                         add_compound_ent_value_w_path(ent_locations, n, path);
 517                 }
 518                 pmap_destroy(wd.fname_map);
 519         }
 520         return gen_initializer_irg(ent_filename, bblock_id, bblock_counts, n_blocks);
 521 }
 522
 523 static void
 524 profile_node_info(void *ctx, FILE *f, const ir_node *irn)
 525 {
 526         (void) ctx;
 527         if(is_Block(irn)) {
 528                 fprintf(f, "profiled execution count: %u\n", ir_profile_get_block_execcount(irn));
 529         }
 530 }
 531
 532 static void
 533 register_vcg_hook(void)
 534 {
 535         memset(&hook, 0, sizeof(hook));
 536         hook.hook._hook_node_info = profile_node_info;
 537         register_hook(hook_node_info, &hook);
 538 }
 539
 540 static void
 541 unregister_vcg_hook(void)
 542 {
 543         unregister_hook(hook_node_info, &hook);
 544 }
 545
 546 /**
 547  * Reads the corresponding profile info file if it exists and returns a
 548  * profile info struct
 549  */
 550 void
 551 ir_profile_read(const char *filename)
 552 {
 553         FILE   *f;
 554         char    buf[8];
 555         size_t  ret;
 556
 557         f = fopen(filename, "r");
 558         if(f == NULL) {
 559                 return;
 560         }
 561         printf("found profile data '%s'.\n", filename);
 562
 563         /* check magic */
 564         ret = fread(buf, 8, 1, f);
 565         if(ret == 0 || strncmp(buf, "firmprof", 8) != 0) {
 566                 return;
 567         }
 568
 569         if(profile) ir_profile_free();
 570         profile = new_set(cmp_execcount, 16);
 571
 572         do {
 573                 execcount_t  query;
 574                 ret = fread(&query, sizeof(unsigned int), 2, f);
 575
 576                 if(ret != 2) break;
 577
 578                 set_insert(profile, &query, sizeof(query), query.block);
 579         } while(1);
 580
 581         fclose(f);
 582         register_vcg_hook();
 583 }
 584
 585 /**
 586  * Frees the profile info
 587  */
 588 void
 589 ir_profile_free(void)
 590 {
 591         if(profile) {
 592                 unregister_vcg_hook();
 593                 del_set(profile);
 594         }
 595 }
 596
 597 /**
 598  * Tells whether profile module has acquired data
 599  */
 600 int
 601 ir_profile_has_data(void)
 602 {
 603         return (profile != NULL);
 604 }
 605
 606 /**
 607  * Get block execution count as determined be profiling
 608  */
 609 unsigned int
 610 ir_profile_get_block_execcount(const ir_node *block)
 611 {
 612         execcount_t *ec, query;
 613
 614         if(!profile)
 615                 return 1;
 616
 617         query.block = get_irn_node_nr(block);
 618         ec = set_find(profile, &query, sizeof(query), get_irn_node_nr(block));
 619
 620         if(ec != NULL) {
 621                 return ec->count;
 622         } else {
 623                 ir_fprintf(stderr, "Warning: Profile contains no data for %+F\n",
 624                            block);
 625                 return 1;
 626         }
 627 }
 628
 629 typedef struct _intialize_execfreq_env_t {
 630         ir_graph *irg;
 631         ir_exec_freq *execfreqs;
 632         double freq_factor;
 633 } initialize_execfreq_env_t;
 634
 635 // minimal execution frequency (an execfreq of 0 confuses algos)
 636 static const double MIN_EXECFREQ = 0.00001;
 637
 638 static void initialize_execfreq(ir_node *block, void *data) {
 639         initialize_execfreq_env_t *env = data;
 640         double freq;
 641
 642         if(block == get_irg_start_block(env->irg)
 643            || block == get_irg_end_block(env->irg)) {
 644                 freq = 1.0;
 645         } else {
 646                 freq = ir_profile_get_block_execcount(block);
 647                 freq *= env->freq_factor;
 648                 if(freq < MIN_EXECFREQ)
 649                         freq = MIN_EXECFREQ;
 650         }
 651
 652         set_execfreq(env->execfreqs, block, freq);
 653 }
 654
 655 ir_exec_freq *ir_create_execfreqs_from_profile(ir_graph *irg)
 656 {
 657         ir_node *start_block;
 658         initialize_execfreq_env_t env;
 659         unsigned count;
 660
 661         env.irg = irg;
 662         env.execfreqs = create_execfreq(irg);
 663         start_block = get_irg_start_block(irg);
 664
 665         count = ir_profile_get_block_execcount(start_block);
 666         if(count == 0) {
 667                 // the function was never executed, so fallback to estimated freqs
 668                 free_execfreq(env.execfreqs);
 669
 670                 return compute_execfreq(irg, 10);
 671         }
 672
 673         env.freq_factor = 1.0 / count;
 674         irg_block_walk_graph(irg, initialize_execfreq, NULL, &env);
 675
 676         return env.execfreqs;
 677 }