nsz Git - libfirm/blob - ir/ana/vrp.c

   1 /*
   2  * Copyright (C) 1995-2009 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       analyze graph to provide value range information
  23  * @author      Jonas Fietz
  24  * @version     $Id$
  25  */
  26 #include "config.h"
  27
  28 #include "config.h"
  29 #include "irtypes.h"
  30 #include "vrp.h"
  31 #include "irouts.h"
  32 #include "irgraph_t.h"
  33 #include "irgopt.h"
  34 #include "irpass.h"
  35 #include "irgwalk.h"
  36 #include "iredges.h"
  37 #include "tv.h"
  38 #include "irop.h"
  39 #include "pdeq.h"
  40 #include "irphase_t.h"
  41
  42
  43 static char v;
  44 static void *VISITED = &v;
  45
  46 struct vrp_env_t {
  47         waitq *workqueue;
  48 };
  49
  50 static int vrp_update_node(ir_node *node)
  51 {
  52         tarval *new_bits_set = get_tarval_bad();
  53         tarval *new_bits_not_set = get_tarval_bad();
  54         tarval *new_range_bottom = get_tarval_bad();
  55         tarval *new_range_top = get_tarval_bad();
  56         ir_node *new_bits_node = NULL;
  57         ir_node *new_range_node = NULL;
  58         enum range_types new_range_type = VRP_UNDEFINED;
  59         enum range_ops new_range_op = VRP_NONE;
  60         int something_changed = 0;
  61         vrp_attr *vrp;
  62         ir_phase *phase;
  63
  64         if (!mode_is_int(get_irn_mode(node))) {
  65                 return 0; /* we don't optimize for non-int-nodes*/
  66         }
  67
  68         phase = get_irg_phase(get_irn_irg(node), PHASE_VRP);
  69
  70         ir_printf("update_vrp for %d called\n", get_irn_node_nr(node));
  71         vrp = phase_get_or_set_irn_data(phase, node);
  72
  73         /* TODO: Check if all predecessors have valid VRP information*/
  74
  75
  76
  77         switch (get_irn_opcode(node)) {
  78         case iro_Const: {
  79                 tarval *tv = get_Const_tarval(node);
  80                 new_bits_set = tv;
  81                 new_bits_not_set = tarval_not(tv);
  82                 new_range_bottom = tv;
  83                 new_range_top = tv;
  84                 new_range_type = VRP_RANGE;
  85                 break;
  86         }
  87
  88         case iro_And: {
  89                 vrp_attr *vrp_left, *vrp_right;
  90                 ir_node *left, *right;
  91                 tarval *tmp_tv;
  92
  93                 left = get_And_left(node);
  94                 right = get_And_right(node);
  95                 vrp_left = phase_get_or_set_irn_data(phase, left);
  96                 vrp_right = phase_get_or_set_irn_data(phase, right);
  97
  98
  99                 new_bits_set = tarval_and(vrp_left->bits_set, vrp_right->bits_set);
 100                 new_bits_not_set = tarval_or(vrp_left->bits_not_set, vrp_right->bits_not_set);
 101
 102                 tmp_tv = tarval_not(vrp_left->bits_set);
 103                 tmp_tv = tarval_eor(vrp_left->bits_not_set, tmp_tv);
 104                 /*check if one of the predecessors is completely determined*/
 105                 if (tarval_is_null(tmp_tv)) {
 106                         new_bits_node = right;
 107                 }
 108
 109                 tmp_tv = tarval_not(vrp_right->bits_set);
 110                 tmp_tv = tarval_eor(vrp_right->bits_not_set, tmp_tv);
 111                 if (tarval_is_null(tmp_tv)) {
 112                         new_bits_node = left;
 113                 }
 114                 break;
 115         }
 116
 117         case iro_Add: {
 118                 vrp_attr *vrp_left, *vrp_right;
 119                 vrp_left = phase_get_or_set_irn_data(phase, get_Add_left(node));
 120                 vrp_right = phase_get_or_set_irn_data(phase, get_Add_right(node));
 121                 int overflow_top, overflow_bottom;
 122                 tarval *new_top, *new_bottom;
 123
 124                 if (vrp_left->range_type == VRP_UNDEFINED || vrp_right->range_type ==
 125                                 VRP_UNDEFINED || vrp_left->range_type == VRP_VARYING ||
 126                                 vrp_right->range_type == VRP_VARYING) {
 127                         return 0;
 128                 }
 129
 130                 new_top = tarval_add(vrp_left->range_top, vrp_right->range_top);
 131                 overflow_top = tarval_carry();
 132                 new_bottom = tarval_add(vrp_left->range_bottom, vrp_right->range_bottom);
 133                 overflow_bottom = tarval_carry();
 134
 135                 if (!overflow_top && !overflow_bottom && vrp_left->range_type == VRP_RANGE
 136                                 &&vrp_right->range_type == VRP_RANGE) {
 137                         new_range_bottom = new_bottom;
 138                         new_range_top = new_top;
 139                         new_range_type = VRP_RANGE;
 140                 }
 141
 142                 if (overflow_top || overflow_bottom) {
 143                         /* TODO Implement overflow handling*/
 144                         new_range_type = VRP_UNDEFINED;
 145                 }
 146                 break;
 147         }
 148
 149         case iro_Sub: {
 150                 vrp_attr *vrp_left, *vrp_right;
 151                 vrp_left = phase_get_or_set_irn_data(phase, get_Sub_left(node));
 152                 vrp_right = phase_get_or_set_irn_data(phase, get_Sub_right(node));
 153                 int overflow_top, overflow_bottom;
 154                 tarval *new_top, *new_bottom;
 155
 156                 if (vrp_left->range_type == VRP_UNDEFINED || vrp_right->range_type ==
 157                                 VRP_UNDEFINED) {
 158                         return 0;
 159                 }
 160
 161                 new_top = tarval_sub(vrp_left->range_top, vrp_right->range_top, NULL);
 162                 overflow_top = tarval_carry();
 163                 new_bottom = tarval_sub(vrp_left->range_bottom, vrp_right->range_bottom, NULL);
 164                 overflow_bottom = tarval_carry();
 165
 166                 if (!overflow_top && !overflow_bottom && vrp_left->range_type == VRP_RANGE
 167                                 &&vrp_right->range_type == VRP_RANGE) {
 168                         new_range_bottom = new_bottom;
 169                         new_range_top = new_top;
 170                         new_range_type = VRP_RANGE;
 171                 }
 172
 173                 if (overflow_top || overflow_bottom) {
 174                         /* TODO Implement overflow handling*/
 175                 }
 176                 break;
 177         }
 178
 179         case iro_Or: {
 180                 vrp_attr *vrp_left, *vrp_right;
 181                 ir_node *left, *right;
 182                 tarval *tmp_tv;
 183
 184                 left = get_Or_left(node);
 185                 right = get_Or_right(node);
 186
 187                 vrp_left = phase_get_or_set_irn_data(phase, get_Or_left(node));
 188                 vrp_right = phase_get_or_set_irn_data(phase, get_Or_right(node));
 189
 190                 new_bits_set = tarval_or(vrp_left->bits_set, vrp_right->bits_set);
 191                 new_bits_not_set = tarval_and(vrp_left->bits_not_set, vrp_right->bits_not_set);
 192
 193                 tmp_tv = tarval_not(vrp_left->bits_set);
 194                 tmp_tv = tarval_eor(vrp_left->bits_not_set, tmp_tv);
 195                 /*check if one of the predecessors is completely determined*/
 196                 if (tarval_is_null(tmp_tv)) {
 197                         new_bits_node = right;
 198                 }
 199
 200                 tmp_tv = tarval_not(vrp_right->bits_set);
 201                 tmp_tv = tarval_eor(vrp_right->bits_not_set, tmp_tv);
 202                 if (tarval_is_null(tmp_tv)) {
 203                         new_bits_node = left;
 204                 }
 205                 break;
 206         }
 207
 208         case iro_Rotl: {
 209                 vrp_attr *vrp_left, *vrp_right;
 210                 ir_node *right = get_Rotl_right(node);
 211
 212                 vrp_left = phase_get_or_set_irn_data(phase, get_Rotl_left(node));
 213                 vrp_right = phase_get_or_set_irn_data(phase, get_Rotl_right(node));
 214
 215                 /* We can only compute this if the right value is a constant*/
 216                 if (is_Const(right)) {
 217                         tarval *bits_set, *bits_not_set;
 218                         bits_set = tarval_rotl(vrp_left->bits_set, get_Const_tarval(right));
 219                         bits_not_set = tarval_rotl(vrp_left->bits_not_set, get_Const_tarval(right));
 220
 221                         new_bits_set = tarval_or(bits_set, vrp->bits_set);
 222                         new_bits_not_set = tarval_or(bits_not_set, vrp->bits_not_set);
 223                 }
 224                 break;
 225         }
 226
 227         case iro_Shl: {
 228                 vrp_attr *vrp_left, *vrp_right;
 229                 ir_node *right = get_Shl_right(node);
 230                 vrp_left = phase_get_or_set_irn_data(phase, get_Shl_left(node));
 231                 vrp_right = phase_get_or_set_irn_data(phase, get_Shl_right(node));
 232
 233                 /* We can only compute this if the right value is a constant*/
 234                 if (is_Const(right)) {
 235                         tarval *bits_set, *bits_not_set;
 236                         ir_mode *m = get_tarval_mode(vrp->bits_not_set);
 237                         bits_set = tarval_shl(vrp_left->bits_set, get_Const_tarval(right));
 238                         bits_not_set = tarval_shl(vrp_left->bits_not_set, get_Const_tarval(right));
 239
 240                         new_bits_set = tarval_or(bits_set, vrp->bits_set);
 241                         new_bits_not_set = tarval_or(bits_not_set, vrp->bits_not_set);
 242
 243                         bits_not_set = tarval_not( tarval_shl(
 244                                                                                 get_mode_all_one(m),
 245                                                                                 get_Const_tarval(right)));
 246                         new_bits_not_set = tarval_or(bits_not_set, new_bits_not_set);
 247
 248                 }
 249                 break;
 250         }
 251
 252         case iro_Shr: {
 253                 vrp_attr *vrp_left, *vrp_right;
 254                 ir_node *right = get_Shr_right(node);
 255
 256                 vrp_left = phase_get_or_set_irn_data(phase, get_Shr_left(node));
 257                 vrp_right = phase_get_or_set_irn_data(phase, get_Shr_right(node));
 258
 259                 /* We can only compute this if the right value is a constant*/
 260                 if (is_Const(right)) {
 261                         tarval *bits_set, *bits_not_set;
 262                         ir_mode *m = get_tarval_mode(vrp->bits_not_set);
 263                         bits_set = tarval_shr(vrp_left->bits_set, get_Const_tarval(right));
 264                         bits_not_set = tarval_shr(vrp_left->bits_not_set, get_Const_tarval(right));
 265
 266                         new_bits_set = tarval_or(bits_set, vrp->bits_set);
 267                         new_bits_not_set = tarval_or(bits_not_set, vrp->bits_not_set);
 268
 269                         bits_not_set = tarval_not( tarval_shr(
 270                                                                                 get_mode_all_one(m),
 271                                                                                 get_Const_tarval(right)));
 272                         new_bits_not_set = tarval_or(bits_not_set, new_bits_not_set);
 273                 }
 274                 break;
 275         }
 276
 277         case iro_Shrs: {
 278                 vrp_attr *vrp_left, *vrp_right;
 279                 ir_node *right = get_Shrs_right(node);
 280
 281                 vrp_left = phase_get_or_set_irn_data(phase, get_Shrs_left(node));
 282                 vrp_right = phase_get_or_set_irn_data(phase, get_Shrs_right(node));
 283
 284                 /* We can only compute this if the right value is a constant*/
 285                 if (is_Const(right)) {
 286                         tarval *bits_set, *bits_not_set;
 287                         ir_mode *m = get_tarval_mode(vrp->bits_not_set);
 288                         bits_set = tarval_shrs(vrp_left->bits_set, get_Const_tarval(right));
 289                         bits_not_set = tarval_shrs(vrp_left->bits_not_set, get_Const_tarval(right));
 290
 291                         new_bits_set = tarval_or(bits_set, vrp->bits_set);
 292                         new_bits_not_set = tarval_or(bits_not_set, vrp->bits_not_set);
 293
 294                         bits_not_set = tarval_not( tarval_shrs(
 295                                                                                 get_mode_all_one(m),
 296                                                                                 get_Const_tarval(right)));
 297                         new_bits_not_set = tarval_or(bits_not_set, new_bits_not_set);
 298                 }
 299                 break;
 300         }
 301
 302         case iro_Eor: {
 303                 vrp_attr *vrp_left, *vrp_right;
 304
 305                 vrp_left = phase_get_or_set_irn_data(phase, get_Eor_left(node));
 306                 vrp_right = phase_get_or_set_irn_data(phase, get_Eor_right(node));
 307
 308                 tarval *bits_set, *bits_not_set;
 309                 bits_not_set = tarval_or(
 310                                                         tarval_and(vrp_left->bits_set, vrp_right->bits_set),
 311                                                         tarval_and(vrp_left->bits_not_set,
 312                                                                 vrp_right->bits_not_set));
 313
 314                 bits_set = tarval_or(
 315                                                 tarval_and(vrp_left->bits_set, vrp_right->bits_not_set),
 316                                                 tarval_and(vrp_left->bits_not_set, vrp_right->bits_set));
 317
 318                 new_bits_set = tarval_or(bits_set, vrp->bits_set);
 319                 new_bits_not_set = tarval_or(bits_not_set, vrp->bits_not_set);
 320                 break;
 321         }
 322
 323         case iro_Id: {
 324                 vrp_attr *vrp_pred = phase_get_or_set_irn_data(phase, get_Id_pred(node));
 325                 new_bits_set = vrp_pred->bits_set;
 326                 new_bits_not_set = vrp_pred->bits_not_set;
 327                 new_range_top = vrp_pred->range_top;
 328                 new_range_bottom = vrp_pred->range_bottom;
 329                 new_range_type = vrp_pred->range_type;
 330                 break;
 331         }
 332
 333         case iro_Not: {
 334                 vrp_attr *vrp_pred = phase_get_or_set_irn_data(phase, get_Not_op(node));
 335                 new_bits_set = tarval_or(vrp_pred->bits_not_set, vrp->bits_set);
 336                 new_bits_not_set = tarval_or(vrp_pred->bits_set, vrp->bits_not_set);
 337                 break;
 338         }
 339
 340         case iro_Conv: {
 341                 ir_node *pred = get_Conv_op(node);
 342                 ir_mode *old_mode = get_irn_mode(pred);
 343                 vrp_attr *vrp_pred = phase_get_or_set_irn_data(phase, pred);
 344
 345                 ir_mode *new_mode;
 346                 tarval *bits_not_set;
 347
 348                 if (!mode_is_int(old_mode))
 349                         return 0;
 350
 351                 new_mode = get_irn_mode(node);
 352
 353                 /* The second and is needed if target type is smaller*/
 354                 bits_not_set = tarval_not(
 355                                                         tarval_convert_to(get_mode_all_one(old_mode),
 356                                                                 new_mode
 357                                                                 ));
 358                 bits_not_set = tarval_or(bits_not_set, tarval_convert_to(vrp_pred->bits_not_set, new_mode));
 359                 new_bits_not_set = tarval_or(bits_not_set, vrp->bits_not_set);
 360                 new_bits_set = tarval_and(
 361                                 tarval_not(bits_not_set), tarval_convert_to(vrp_pred->bits_set, new_mode));
 362
 363                 if (tarval_cmp(vrp_pred->range_top, get_mode_max(new_mode)) == pn_Cmp_Le) {
 364                         vrp->range_top = vrp_pred->range_top;
 365                 }
 366
 367                 if (tarval_cmp(vrp_pred->range_bottom, get_mode_min(new_mode)) == pn_Cmp_Ge) {
 368                         vrp->range_bottom = vrp_pred->range_bottom;
 369                 }
 370                 break;
 371         }
 372
 373         case iro_Confirm: {
 374                 pn_Cmp cmp = get_Confirm_cmp(node);
 375                 ir_node *bound = get_Confirm_bound(node);
 376
 377                 /** @todo: Handle non-Const bounds */
 378
 379                 if (cmp == pn_Cmp_Lg) {
 380                         /** @todo: Is there some way to preserve the information? */
 381                         new_range_type = VRP_ANTIRANGE;
 382                         if (is_Const(bound)) {
 383                                 new_range_top = get_Const_tarval(bound);
 384                                 new_range_bottom = get_Const_tarval(bound);
 385                         }
 386                 } else if (cmp == pn_Cmp_Le) {
 387                         if (vrp->range_type == VRP_UNDEFINED) {
 388                                 new_range_type = VRP_RANGE;
 389                                 if (is_Const(bound)) {
 390                                         new_range_top = get_Const_tarval(bound);
 391                                 }
 392                                 new_range_bottom = get_tarval_min(get_irn_mode(node));
 393                         } else if (vrp->range_type == VRP_RANGE) {
 394                                 if (is_Const(bound)) {
 395                                         if (tarval_cmp(vrp->range_top,
 396                                                                 get_Const_tarval(bound)) == pn_Cmp_Le) {
 397                                                 new_range_top = get_Const_tarval(bound);
 398                                         }
 399                                         new_range_bottom = get_tarval_min(get_irn_mode(node));
 400
 401                                 } else if (vrp->range_type == VRP_ANTIRANGE) {
 402                                         /** @todo: How do we manage not to get a never ending loop? */
 403                                 }
 404                         }
 405                 }
 406                 break;
 407         }
 408
 409         case iro_Phi: {
 410                 /* combine all ranges*/
 411
 412                 ir_node *pred = get_Phi_pred(node,0);
 413                 vrp_attr *vrp_pred = phase_get_or_set_irn_data(phase, pred);
 414                 new_range_top = vrp_pred->range_top;
 415                 new_range_bottom = vrp_pred->range_bottom;
 416                 new_range_type = vrp_pred->range_type;
 417                 new_bits_set = vrp_pred->bits_set;
 418                 new_bits_not_set = vrp_pred->bits_not_set;
 419
 420                 int num = get_Phi_n_preds(node);
 421                 pn_Cmp cmp;
 422                 int i;
 423
 424                 assert(num > 0);
 425
 426
 427                 for (i = 1; i < num; i++) {
 428                         pred = get_Phi_pred(node, i);
 429                         vrp_pred = phase_get_or_set_irn_data(phase, pred);
 430                         if (new_range_type == VRP_RANGE && vrp_pred->range_type ==
 431                                         VRP_RANGE) {
 432                                 cmp = tarval_cmp(new_range_top, vrp_pred->range_top);
 433                                 if (cmp == pn_Cmp_Lt) {
 434                                         new_range_top = vrp_pred->range_top;
 435                                 }
 436                                 cmp = tarval_cmp(new_range_bottom, vrp_pred->range_bottom);
 437                                 if (cmp == pn_Cmp_Gt) {
 438                                         new_range_bottom = vrp_pred->range_bottom;
 439                                 }
 440                         } else {
 441                                 new_range_type = VRP_VARYING;
 442                                 break;
 443                         }
 444                 }
 445
 446                 break;
 447         }
 448         default:
 449                 /* unhandled, therefore never updated */
 450                 break;
 451         }
 452
 453
 454
 455         /* TODO: Check, if there can be information derived from any of these:
 456         is_Abs(node) is_Alloc(node) is_Anchor(node) is_Borrow(node) is_Bound(node)
 457         is_Break(node) is_Builtin(node) is_Call(node) is_CallBegin(node)
 458         is_Carry(node) is_Cast(node) is_Cmp(node) is_Cond(node)
 459         is_CopyB(node) is_Div(node) is_DivMod(node) is_Dummy(node)
 460         is_End(node) is_EndExcept(node) is_EndReg(node) is_Filter(node) is_Free(node)
 461         is_IJmp(node) is_InstOf(node) is_Jmp(node) is_Load(node) is_Minus(node)
 462         is_Mod(node) is_Mul(node) is_Mulh(node) is_Mux(node) is_NoMem(node)
 463         is_Pin(node) is_Proj(node) is_Quot(node)
 464         is_Raise(node) is_Return(node) is_Sel(node) is_Start(node) is_Store(node)
 465         is_SymConst(node) is_Sync(node) is_Tuple(node)
 466         */
 467
 468         /* Merge the newly calculated values with those that might already exist*/
 469         if (new_bits_set != tarval_bad) {
 470                 new_bits_set = tarval_or(new_bits_set, vrp->bits_set);
 471                 if (tarval_cmp(new_bits_set, vrp->bits_set) != pn_Cmp_Eq) {
 472                         something_changed = 1;
 473                         vrp->bits_set = new_bits_set;
 474                 }
 475         }
 476
 477         if (new_bits_not_set != tarval_bad) {
 478                 new_bits_not_set = tarval_or(new_bits_not_set, vrp->bits_not_set);
 479
 480                 if (tarval_cmp(new_bits_not_set, vrp->bits_not_set) != pn_Cmp_Eq) {
 481                         something_changed = 1;
 482                         vrp->bits_not_set = new_bits_not_set;
 483                 }
 484         }
 485
 486         if (vrp->bits_node == NULL && new_bits_node != NULL) {
 487                 something_changed = 1;
 488                 vrp->bits_node = new_bits_node;
 489         }
 490
 491         if (vrp->range_type == VRP_UNDEFINED &&
 492                         new_range_type != VRP_UNDEFINED) {
 493                 something_changed = 1;
 494                 vrp->range_type = new_range_type;
 495                 vrp->range_bottom = new_range_bottom;
 496                 vrp->range_top = new_range_top;
 497                 vrp->range_op = new_range_op;
 498                 vrp->range_node = new_range_node;
 499
 500         } else if (vrp->range_type == VRP_RANGE) {
 501                 if (new_range_type == VRP_RANGE) {
 502                         if ((new_range_node == NULL && vrp->range_node == NULL) ||
 503                                         (new_range_node == vrp->range_node &&
 504                                          new_range_op == vrp->range_op)) {
 505                                 if (tarval_cmp(vrp->range_bottom, new_range_bottom) == pn_Cmp_Lt) {
 506                                         something_changed = 1;
 507                                         vrp->range_bottom = new_range_bottom;
 508                                 }
 509                                 if (tarval_cmp(vrp->range_top, new_range_top) == pn_Cmp_Gt) {
 510                                         something_changed = 1;
 511                                         vrp->range_top = new_range_top;
 512                                 }
 513                         }
 514
 515                         /* prefer the absolute value*/
 516                         if (new_range_node == NULL && vrp->range_node != NULL) {
 517                                 something_changed = 1;
 518                                 vrp->range_node = NULL;
 519                                 vrp->range_top = new_range_top;
 520                                 vrp->range_bottom = new_range_bottom;
 521                         }
 522                 }
 523
 524                 if (new_range_type == VRP_ANTIRANGE) {
 525                         /* if they are overlapping, cut the range.*/
 526                         /* TODO: Maybe we can preserve more information here*/
 527                         if (new_range_node == NULL && vrp->range_node == NULL) {
 528                                 if (tarval_cmp(vrp->range_bottom, new_range_top) == pn_Cmp_Gt &&
 529                                                 tarval_cmp(vrp->range_bottom, new_range_bottom) == pn_Cmp_Gt) {
 530                                         something_changed = 1;
 531                                         vrp->range_bottom = new_range_top;
 532
 533                                 } else if (tarval_cmp(vrp->range_top, new_range_bottom) == pn_Cmp_Gt &&
 534                                                 tarval_cmp(vrp->range_top, new_range_top) == pn_Cmp_Lt) {
 535                                         something_changed = 1;
 536                                         vrp->range_top = new_range_bottom;
 537                                 }
 538
 539                                 /* We can not handle the case where the anti range is in the*/
 540                                 /* range*/
 541                         }
 542
 543                         /* prefer the absolute value*/
 544                         if (new_range_node == NULL && vrp->range_node != NULL) {
 545                                 something_changed = 1;
 546                                 vrp->range_node = NULL;
 547                                 vrp->range_top = new_range_top;
 548                                 vrp->range_bottom = new_range_bottom;
 549                         }
 550                 }
 551         } else if (vrp->range_type == VRP_ANTIRANGE) {
 552                 if (new_range_type == VRP_ANTIRANGE) {
 553                         if ((new_range_node == NULL && vrp->range_node == NULL) ||
 554                                         (new_range_node == vrp->range_node &&
 555                                          new_range_op == vrp->range_op)) {
 556                                 if (tarval_cmp(vrp->range_bottom, new_range_bottom) == pn_Cmp_Gt) {
 557                                         something_changed = 1;
 558                                         vrp->range_bottom = new_range_bottom;
 559                                 }
 560                                 if (tarval_cmp(vrp->range_top, new_range_top) == pn_Cmp_Lt) {
 561                                         something_changed = 1;
 562                                         vrp->range_top = new_range_top;
 563                                 }
 564                         }
 565
 566                         /* prefer the absolute value*/
 567                         if (new_range_node == NULL && vrp->range_node != NULL) {
 568                                 something_changed = 1;
 569                                 vrp->range_node = NULL;
 570                                 vrp->range_top = new_range_top;
 571                                 vrp->range_bottom = new_range_bottom;
 572                         }
 573                 }
 574
 575                 if (new_range_type == VRP_RANGE) {
 576                         if ((new_range_node == NULL && vrp->range_node == NULL) ||
 577                                         (new_range_node == vrp->range_node &&
 578                                          new_range_op == vrp->range_op)) {
 579                                 if (tarval_cmp(vrp->range_bottom, new_range_top) == pn_Cmp_Gt) {
 580                                         something_changed = 1;
 581                                         vrp->range_bottom = new_range_top;
 582                                 }
 583                                 if (tarval_cmp(vrp->range_top, new_range_bottom) == pn_Cmp_Lt) {
 584                                         something_changed = 1;
 585                                         vrp->range_top = new_range_bottom;
 586                                 }
 587                         }
 588
 589                         /* prefer the absolute value*/
 590                         if (new_range_node == NULL && vrp->range_node != NULL) {
 591                                 something_changed = 1;
 592                                 vrp->range_node = NULL;
 593                                 vrp->range_top = new_range_top;
 594                                 vrp->range_bottom = new_range_bottom;
 595                         }
 596                 }
 597         }
 598
 599         assert(tarval_is_null(
 600                                 tarval_and(vrp->bits_set, vrp->bits_not_set)));
 601         return something_changed;
 602 }
 603
 604 static void vrp_first_pass(ir_node *n, void *e)
 605 {
 606         ir_node *succ;
 607         int i;
 608         struct vrp_env_t *env = e;
 609
 610         if (is_Block(n))
 611                 return;
 612
 613         set_irn_link(n, VISITED);
 614
 615         vrp_update_node(n);
 616
 617         for (i = get_irn_n_outs(n) - 1; i >=0; --i) {
 618                 succ =  get_irn_out(n, i);
 619                 if (get_irn_link(succ) == VISITED) {
 620                         /* we found a loop*/
 621                         waitq_put(env->workqueue, n);
 622                 }
 623         }
 624 }
 625
 626 static void *vrp_init_node(ir_phase *phase, const ir_node *n, void *old)
 627 {
 628         ir_printf("initialized node nr: %d\n", get_irn_node_nr(n));
 629         ir_mode *mode;
 630         if (old) {
 631                 assert(1==0 && "init called for node already initialized");
 632         }
 633         vrp_attr *vrp = phase_alloc(phase, sizeof(vrp_attr));
 634
 635         memset(vrp, 0, sizeof(vrp_attr));
 636         /* Initialize the vrp information to default */
 637
 638         mode = get_irn_mode(n);
 639
 640         vrp->range_type = VRP_UNDEFINED;
 641
 642         /* TODO: We might be able to optimize space usage if we do not allocate
 643          * vrp space for non-int nodes. (currently caught by vrp_update_node)
 644          */
 645         if (mode_is_int(mode)) {
 646                 // We are assuming that 0 is always represented as 0x0000
 647                 vrp->valid = 1;
 648                 vrp->bits_set = new_tarval_from_long(0, mode);
 649                 vrp->bits_not_set = new_tarval_from_long(0, mode);
 650                 vrp->range_bottom = get_tarval_top();
 651                 vrp->range_top = get_tarval_top();
 652         } else {
 653                 vrp->valid = 0;
 654                 vrp->bits_set = get_tarval_bad();
 655                 vrp->bits_not_set = get_tarval_bad();
 656                 vrp->range_bottom = get_tarval_bad();
 657                 vrp->range_top = get_tarval_bad();
 658         }
 659         vrp->bits_node = NULL;
 660         vrp->range_node = NULL;
 661         vrp->range_op = VRP_NONE;
 662
 663         /* TODO: We might be able to set better vrp info at this time, if this is
 664          * a node which is newly created in an already initalized irg
 665          *
 666          * maybe just call vrp_update_node and if it returns one, iterate over
 667          * successors
 668          */
 669         return vrp;
 670 }
 671
 672 void set_vrp_data(ir_graph *irg)
 673 {
 674
 675         ir_node *succ, *node;
 676         int i;
 677         struct vrp_env_t *env;
 678         ir_phase *phase;
 679
 680         if (!irg) {
 681                 /* no graph, skip */
 682                 return;
 683         }
 684
 685         assure_irg_outs(irg); /* ensure that out edges are consistent*/
 686         if (!(phase = get_irg_phase(irg, PHASE_VRP))) {
 687                                 /* this is our first run */
 688                 phase = init_irg_phase(irg, PHASE_VRP, 0, vrp_init_node);
 689                 env = phase_alloc(phase, sizeof(struct vrp_env_t));
 690                 phase->priv = env;
 691         } else {
 692                 env = phase->priv;
 693         }
 694
 695         env->workqueue = new_waitq();
 696
 697
 698         irg_walk_graph(irg, NULL, vrp_first_pass, env);
 699
 700         /* while there are entries in the worklist, continue*/
 701         while (!waitq_empty(env->workqueue)) {
 702                 node = waitq_get(env->workqueue);
 703
 704                 if (vrp_update_node(node)) {
 705                         /* if something changed, add successors to worklist*/
 706                         for (i = get_irn_n_outs(node) - 1; i >=0; --i) {
 707                                 succ =  get_irn_out(node, i);
 708                                 waitq_put(env->workqueue, node);
 709                         }
 710                 }
 711         }
 712         del_waitq(env->workqueue);
 713 }
 714
 715
 716 ir_graph_pass_t *set_vrp_pass(const char *name)
 717 {
 718         return def_graph_pass(name ? name : "set_vrp", set_vrp_data);
 719 }
 720
 721 pn_Cmp vrp_cmp(const ir_node *left, const ir_node *right)
 722 {
 723         vrp_attr *vrp_left, *vrp_right;
 724
 725         vrp_left = vrp_get_info(left);
 726         vrp_right = vrp_get_info(right);
 727
 728         if (!vrp_left || !vrp_right) {
 729                 return pn_Cmp_False;
 730         }
 731
 732         if (vrp_left->range_type == VRP_RANGE && vrp_right->range_type == VRP_RANGE) {
 733                 if (tarval_cmp(vrp_left->range_top, vrp_right->range_bottom) == pn_Cmp_Lt) {
 734                         return pn_Cmp_Lt;
 735                 }
 736                 if (tarval_cmp(vrp_left->range_bottom, vrp_right->range_top) == pn_Cmp_Gt) {
 737                         return pn_Cmp_Gt;
 738                 }
 739         }
 740
 741         if (!tarval_is_null(tarval_and(vrp_left->bits_set, vrp_right->bits_not_set)) ||
 742                         !tarval_is_null(tarval_and(vrp_left->bits_not_set, vrp_right->bits_set))) {
 743                 return pn_Cmp_Lg;
 744         }
 745         /* TODO: We can get way more information here*/
 746
 747         return pn_Cmp_False;
 748 }
 749
 750 vrp_attr *vrp_get_info(const ir_node *n) {
 751         ir_graph *irg = get_irn_irg(n);
 752         ir_phase *phase = get_irg_phase(irg, PHASE_VRP);
 753
 754
 755         if (!phase) {
 756                 /* phase has not yet been initialized */
 757                 return NULL;
 758         }
 759
 760         return phase_get_irn_data(phase, n);
 761 }