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   1 /*------------------------------------------------------------------------
   2
   3   SDCCralloc.c - source file for register allocation. (8051) specific
   4
   5         Written By -  Sandeep Dutta . sandeep.dutta@usa.net (1998)
   6         Added Pic Port T.scott Dattalo scott@dattalo.com (2000)
   7
   8           This program is free software; you can redistribute it and/or modify it
   9           under the terms of the GNU General Public License as published by the
  10           Free Software Foundation; either version 2, or (at your option) any
  11           later version.
  12
  13                 This program is distributed in the hope that it will be useful,
  14                 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15                 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16                 GNU General Public License for more details.
  17
  18                   You should have received a copy of the GNU General Public License
  19                   along with this program; if not, write to the Free Software
  20                   Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21
  22                         In other words, you are welcome to use, share and improve this program.
  23                         You are forbidden to forbid anyone else to use, share and improve
  24                         what you give them.   Help stamp out software-hoarding!
  25 -------------------------------------------------------------------------*/
  26
  27 #include "common.h"
  28 #include "ralloc.h"
  29 #include "pcode.h"
  30 #include "gen.h"
  31
  32 #if defined(__BORLANDC__) || defined(_MSC_VER)
  33 #define STRCASECMP stricmp
  34 #else
  35 #define STRCASECMP strcasecmp
  36 #endif
  37
  38 /* this should go in SDCCicode.h, but it doesn't. */
  39 #define IS_REF(op)       (IS_SYMOP(op) && op->operand.symOperand->isref == 1)
  40
  41 /*-----------------------------------------------------------------*/
  42 /* At this point we start getting processor specific although      */
  43 /* some routines are non-processor specific & can be reused when   */
  44 /* targetting other processors. The decision for this will have    */
  45 /* to be made on a routine by routine basis                        */
  46 /* routines used to pack registers are most definitely not reusable */
  47 /* since the pack the registers depending strictly on the MCU      */
  48 /*-----------------------------------------------------------------*/
  49
  50 extern void genpic14Code (iCode *);
  51 extern void assignConfigWordValue(int address, int value);
  52
  53 /* Global data */
  54 static struct
  55 {
  56         bitVect *spiltSet;
  57         set *stackSpil;
  58         bitVect *regAssigned;
  59         short blockSpil;
  60         int slocNum;
  61         bitVect *funcrUsed;             /* registers used in a function */
  62         int stackExtend;
  63         int dataExtend;
  64 }
  65 _G;
  66
  67 /* Shared with gen.c */
  68 int pic14_ptrRegReq;            /* one byte pointer register required */
  69
  70
  71 set *dynAllocRegs=NULL;
  72 set *dynStackRegs=NULL;
  73 set *dynProcessorRegs=NULL;
  74 set *dynDirectRegs=NULL;
  75 set *dynDirectBitRegs=NULL;
  76 set *dynInternalRegs=NULL;
  77
  78 static hTab  *dynDirectRegNames= NULL;
  79 // static hTab  *regHash = NULL;    /* a hash table containing ALL registers */
  80
  81 static int dynrIdx=0x20;
  82 static int rDirectIdx=0;
  83
  84 int pic14_nRegs = 128;   // = sizeof (regspic14) / sizeof (regs);
  85
  86 int Gstack_base_addr=0; /* The starting address of registers that
  87 * are used to pass and return parameters */
  88
  89
  90
  91
  92 static void spillThis (symbol *);
  93 static int debug = 1;
  94 static FILE *debugF = NULL;
  95 /*-----------------------------------------------------------------*/
  96 /* debugLog - open a file for debugging information                */
  97 /*-----------------------------------------------------------------*/
  98 //static void debugLog(char *inst,char *fmt, ...)
  99 static void
 100         debugLog (char *fmt,...)
 101 {
 102         static int append = 0;  // First time through, open the file without append.
 103
 104         char buffer[256];
 105         //char *bufferP=buffer;
 106         va_list ap;
 107
 108         if (!debug || !dstFileName)
 109                 return;
 110
 111
 112         if (!debugF)
 113         {
 114                 /* create the file name */
 115                 strcpy (buffer, dstFileName);
 116                 strcat (buffer, ".d");
 117
 118                 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
 119                 {
 120                         werror (E_FILE_OPEN_ERR, buffer);
 121                         exit (1);
 122                 }
 123                 append = 1;             // Next time debubLog is called, we'll append the debug info
 124
 125         }
 126
 127         va_start (ap, fmt);
 128
 129         vsprintf (buffer, fmt, ap);
 130
 131         fprintf (debugF, "%s", buffer);
 132         /*
 133         while (isspace(*bufferP)) bufferP++;
 134
 135         if (bufferP && *bufferP)
 136                 lineCurr = (lineCurr ?
 137                 connectLine(lineCurr,newLineNode(lb)) :
 138                 (lineHead = newLineNode(lb)));
 139         lineCurr->isInline = _G.inLine;
 140         lineCurr->isDebug  = _G.debugLine;
 141         */
 142         va_end (ap);
 143
 144 }
 145
 146 static void
 147         debugNewLine (void)
 148 {
 149         if (debugF)
 150                 fputc ('\n', debugF);
 151 }
 152  /*-----------------------------------------------------------------*/
 153  /* debugLogClose - closes the debug log file (if opened)           */
 154  /*-----------------------------------------------------------------*/
 155 static void
 156         debugLogClose (void)
 157 {
 158         if (debugF)
 159         {
 160                  fclose (debugF);
 161                  debugF = NULL;
 162         }
 163 }
 164 #define AOP(op) op->aop
 165
 166 static char *
 167         debugAopGet (char *str, operand * op)
 168 {
 169         if (str)
 170                 debugLog (str);
 171
 172         printOperand (op, debugF);
 173         debugNewLine ();
 174
 175         return NULL;
 176
 177 }
 178
 179 static char *
 180         decodeOp (unsigned int op)
 181 {
 182
 183         if (op < 128 && op > ' ')
 184         {
 185                 buffer[0] = (op & 0xff);
 186                 buffer[1] = 0;
 187                 return buffer;
 188         }
 189
 190         switch (op)
 191         {
 192         case IDENTIFIER:
 193                 return "IDENTIFIER";
 194         case TYPE_NAME:
 195                 return "TYPE_NAME";
 196         case CONSTANT:
 197                 return "CONSTANT";
 198         case STRING_LITERAL:
 199                 return "STRING_LITERAL";
 200         case SIZEOF:
 201                 return "SIZEOF";
 202         case PTR_OP:
 203                 return "PTR_OP";
 204         case INC_OP:
 205                 return "INC_OP";
 206         case DEC_OP:
 207                 return "DEC_OP";
 208         case LEFT_OP:
 209                 return "LEFT_OP";
 210         case RIGHT_OP:
 211                 return "RIGHT_OP";
 212         case LE_OP:
 213                 return "LE_OP";
 214         case GE_OP:
 215                 return "GE_OP";
 216         case EQ_OP:
 217                 return "EQ_OP";
 218         case NE_OP:
 219                 return "NE_OP";
 220         case AND_OP:
 221                 return "AND_OP";
 222         case OR_OP:
 223                 return "OR_OP";
 224         case MUL_ASSIGN:
 225                 return "MUL_ASSIGN";
 226         case DIV_ASSIGN:
 227                 return "DIV_ASSIGN";
 228         case MOD_ASSIGN:
 229                 return "MOD_ASSIGN";
 230         case ADD_ASSIGN:
 231                 return "ADD_ASSIGN";
 232         case SUB_ASSIGN:
 233                 return "SUB_ASSIGN";
 234         case LEFT_ASSIGN:
 235                 return "LEFT_ASSIGN";
 236         case RIGHT_ASSIGN:
 237                 return "RIGHT_ASSIGN";
 238         case AND_ASSIGN:
 239                 return "AND_ASSIGN";
 240         case XOR_ASSIGN:
 241                 return "XOR_ASSIGN";
 242         case OR_ASSIGN:
 243                 return "OR_ASSIGN";
 244         case TYPEDEF:
 245                 return "TYPEDEF";
 246         case EXTERN:
 247                 return "EXTERN";
 248         case STATIC:
 249                 return "STATIC";
 250         case AUTO:
 251                 return "AUTO";
 252         case REGISTER:
 253                 return "REGISTER";
 254         case CODE:
 255                 return "CODE";
 256         case EEPROM:
 257                 return "EEPROM";
 258         case INTERRUPT:
 259                 return "INTERRUPT";
 260         case SFR:
 261                 return "SFR";
 262         case AT:
 263                 return "AT";
 264         case SBIT:
 265                 return "SBIT";
 266         case REENTRANT:
 267                 return "REENTRANT";
 268         case USING:
 269                 return "USING";
 270         case XDATA:
 271                 return "XDATA";
 272         case DATA:
 273                 return "DATA";
 274         case IDATA:
 275                 return "IDATA";
 276         case PDATA:
 277                 return "PDATA";
 278         case VAR_ARGS:
 279                 return "VAR_ARGS";
 280         case CRITICAL:
 281                 return "CRITICAL";
 282         case NONBANKED:
 283                 return "NONBANKED";
 284         case BANKED:
 285                 return "BANKED";
 286         case CHAR:
 287                 return "CHAR";
 288         case SHORT:
 289                 return "SHORT";
 290         case INT:
 291                 return "INT";
 292         case LONG:
 293                 return "LONG";
 294         case SIGNED:
 295                 return "SIGNED";
 296         case UNSIGNED:
 297                 return "UNSIGNED";
 298         case FLOAT:
 299                 return "FLOAT";
 300         case DOUBLE:
 301                 return "DOUBLE";
 302         case CONST:
 303                 return "CONST";
 304         case VOLATILE:
 305                 return "VOLATILE";
 306         case VOID:
 307                 return "VOID";
 308         case BIT:
 309                 return "BIT";
 310         case STRUCT:
 311                 return "STRUCT";
 312         case UNION:
 313                 return "UNION";
 314         case ENUM:
 315                 return "ENUM";
 316         case ELIPSIS:
 317                 return "ELIPSIS";
 318         case RANGE:
 319                 return "RANGE";
 320         case FAR:
 321                 return "FAR";
 322         case CASE:
 323                 return "CASE";
 324         case DEFAULT:
 325                 return "DEFAULT";
 326         case IF:
 327                 return "IF";
 328         case ELSE:
 329                 return "ELSE";
 330         case SWITCH:
 331                 return "SWITCH";
 332         case WHILE:
 333                 return "WHILE";
 334         case DO:
 335                 return "DO";
 336         case FOR:
 337                 return "FOR";
 338         case GOTO:
 339                 return "GOTO";
 340         case CONTINUE:
 341                 return "CONTINUE";
 342         case BREAK:
 343                 return "BREAK";
 344         case RETURN:
 345                 return "RETURN";
 346         case INLINEASM:
 347                 return "INLINEASM";
 348         case IFX:
 349                 return "IFX";
 350         case ADDRESS_OF:
 351                 return "ADDRESS_OF";
 352         case GET_VALUE_AT_ADDRESS:
 353                 return "GET_VALUE_AT_ADDRESS";
 354         case SPIL:
 355                 return "SPIL";
 356         case UNSPIL:
 357                 return "UNSPIL";
 358         case GETHBIT:
 359                 return "GETHBIT";
 360         case BITWISEAND:
 361                 return "BITWISEAND";
 362         case UNARYMINUS:
 363                 return "UNARYMINUS";
 364         case IPUSH:
 365                 return "IPUSH";
 366         case IPOP:
 367                 return "IPOP";
 368         case PCALL:
 369                 return "PCALL";
 370         case ENDFUNCTION:
 371                 return "ENDFUNCTION";
 372         case JUMPTABLE:
 373                 return "JUMPTABLE";
 374         case RRC:
 375                 return "RRC";
 376         case RLC:
 377                 return "RLC";
 378         case CAST:
 379                 return "CAST";
 380         case CALL:
 381                 return "CALL";
 382         case PARAM:
 383                 return "PARAM  ";
 384         case NULLOP:
 385                 return "NULLOP";
 386         case BLOCK:
 387                 return "BLOCK";
 388         case LABEL:
 389                 return "LABEL";
 390         case RECEIVE:
 391                 return "RECEIVE";
 392         case SEND:
 393                 return "SEND";
 394         }
 395         sprintf (buffer, "unknown op %d %c", op, op & 0xff);
 396         return buffer;
 397 }
 398 /*-----------------------------------------------------------------*/
 399 /*-----------------------------------------------------------------*/
 400 static char *
 401 debugLogRegType (short type)
 402 {
 403
 404         switch (type)
 405         {
 406         case REG_GPR:
 407                 return "REG_GPR";
 408         case REG_PTR:
 409                 return "REG_PTR";
 410         case REG_CND:
 411                 return "REG_CND";
 412         }
 413
 414         sprintf (buffer, "unknown reg type %d", type);
 415         return buffer;
 416 }
 417
 418 /*-----------------------------------------------------------------*/
 419 /*-----------------------------------------------------------------*/
 420 static int regname2key(char const *name)
 421 {
 422         int key = 0;
 423
 424         if(!name)
 425                 return 0;
 426
 427         while(*name) {
 428
 429                 key += (*name++) + 1;
 430
 431         }
 432
 433         return ( (key + (key >> 4) + (key>>8)) & 0x3f);
 434
 435 }
 436
 437 /*-----------------------------------------------------------------*/
 438 /* newReg - allocate and init memory for a new register            */
 439 /*-----------------------------------------------------------------*/
 440 static regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias)
 441 {
 442
 443         regs *dReg;
 444
 445         dReg = Safe_calloc(1,sizeof(regs));
 446         dReg->type = type;
 447         dReg->pc_type = pc_type;
 448         dReg->rIdx = rIdx;
 449         if(name) {
 450                 dReg->name = Safe_strdup(name);
 451         } else {
 452                 sprintf(buffer,"r0x%02X", dReg->rIdx);
 453                 dReg->name = Safe_strdup(buffer);
 454         }
 455         //fprintf(stderr,"newReg: %s, rIdx = 0x%02x\n",dReg->name,rIdx);
 456         dReg->isFree = 0;
 457         dReg->wasUsed = 1;
 458         if (type == REG_SFR)
 459                 dReg->isFixed = 1;
 460         else
 461                 dReg->isFixed = 0;
 462
 463         dReg->isMapped = 0;
 464         dReg->isEmitted = 0;
 465         dReg->isPublic = 0;
 466         dReg->isExtern = 0;
 467         dReg->address = 0;
 468         dReg->size = size;
 469         dReg->alias = alias;
 470         dReg->reg_alias = NULL;
 471         dReg->reglives.usedpFlows = newSet();
 472         dReg->reglives.assignedpFlows = newSet();
 473
 474         hTabAddItem(&dynDirectRegNames, regname2key(name), dReg);
 475
 476         return dReg;
 477 }
 478
 479 /*-----------------------------------------------------------------*/
 480 /* regWithIdx - Search through a set of registers that matches idx */
 481 /*-----------------------------------------------------------------*/
 482 static regs *
 483 regWithIdx (set *dRegs, int idx, int fixed)
 484 {
 485         regs *dReg;
 486
 487         for (dReg = setFirstItem(dRegs) ; dReg ;
 488         dReg = setNextItem(dRegs)) {
 489
 490                 if(idx == dReg->rIdx && (fixed == (int)dReg->isFixed)) {
 491                         return dReg;
 492                 }
 493         }
 494
 495         return NULL;
 496 }
 497
 498 /*-----------------------------------------------------------------*/
 499 /* regWithName - Search through a set of registers that matches name */
 500 /*-----------------------------------------------------------------*/
 501 static regs *
 502 regWithName (set *dRegs, const char *name)
 503 {
 504         regs *dReg;
 505
 506         for (dReg = setFirstItem(dRegs) ; dReg ;
 507         dReg = setNextItem(dRegs)) {
 508
 509                 if((strcmp(name,dReg->name)==0)) {
 510                         return dReg;
 511                 }
 512         }
 513
 514         return NULL;
 515 }
 516
 517 /*-----------------------------------------------------------------*/
 518 /* regWithName - Search for a registers that matches name          */
 519 /*-----------------------------------------------------------------*/
 520 regs *
 521 regFindWithName (const char *name)
 522 {
 523         regs *dReg;
 524
 525         if( (dReg = regWithName ( dynDirectRegs, name)) != NULL ) {
 526                 debugLog ("Found a Direct Register!\n");
 527                 return dReg;
 528         }
 529         if( (dReg = regWithName ( dynDirectBitRegs, name)) != NULL) {
 530                 debugLog ("Found a Direct Bit Register!\n");
 531                 return dReg;
 532         }
 533
 534         if (*name=='_') name++; // Step passed '_'
 535
 536         if( (dReg = regWithName ( dynAllocRegs, name)) != NULL) {
 537                 debugLog ("Found a Dynamic Register!\n");
 538                 return dReg;
 539         }
 540         if( (dReg = regWithName ( dynProcessorRegs, name)) != NULL) {
 541                 debugLog ("Found a Processor Register!\n");
 542                 return dReg;
 543         }
 544         if( (dReg = regWithName ( dynInternalRegs, name)) != NULL) {
 545                 debugLog ("Found an Internal Register!\n");
 546                 return dReg;
 547         }
 548         if( (dReg = regWithName ( dynStackRegs, name)) != NULL) {
 549                 debugLog ("Found an Stack Register!\n");
 550                 return dReg;
 551         }
 552
 553         return NULL;
 554 }
 555
 556 /*-----------------------------------------------------------------*/
 557 /* regFindFree - Search for a free register in a set of registers  */
 558 /*-----------------------------------------------------------------*/
 559 static regs *
 560 regFindFree (set *dRegs)
 561 {
 562         regs *dReg;
 563
 564         for (dReg = setFirstItem(dRegs) ; dReg ;
 565         dReg = setNextItem(dRegs)) {
 566
 567                 if(dReg->isFree)
 568                         return dReg;
 569         }
 570
 571         return NULL;
 572 }
 573 /*-----------------------------------------------------------------*/
 574 /* initStack - allocate registers for a psuedo stack               */
 575 /*-----------------------------------------------------------------*/
 576 void initStack(int base_address, int size)
 577 {
 578
 579         int i;
 580
 581         Gstack_base_addr = base_address;
 582         //fprintf(stderr,"initStack");
 583
 584         for(i = 0; i<size; i++) {
 585                 regs *r = newReg(REG_STK, PO_GPR_TEMP,base_address,NULL,1,0);
 586                 r->address = base_address; // Pseudo stack needs a fixed location that can be known by all modules
 587                 r->isFixed = 1;
 588                 r->name[0] = 's';
 589                 r->alias = 0x180; // Using shared memory for pseudo stack
 590                 addSet(&dynStackRegs,r);
 591                 base_address--;
 592         }
 593 }
 594
 595 /*-----------------------------------------------------------------*
 596 *-----------------------------------------------------------------*/
 597 regs *
 598 allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
 599 {
 600
 601         //fprintf(stderr,"allocProcessorRegister %s addr =0x%x\n",name,rIdx);
 602         return addSet(&dynProcessorRegs,newReg(REG_SFR, po_type, rIdx, name,1,alias));
 603 }
 604
 605 /*-----------------------------------------------------------------*
 606 *-----------------------------------------------------------------*/
 607
 608 regs *
 609 allocInternalRegister(int rIdx, char * name, short po_type, int alias)
 610 {
 611         regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias);
 612
 613         //fprintf(stderr,"allocInternalRegister %s addr =0x%x\n",name,rIdx);
 614         if(reg) {
 615                 reg->wasUsed = 0;
 616                 return addSet(&dynInternalRegs,reg);
 617         }
 618
 619         return NULL;
 620 }
 621 /*-----------------------------------------------------------------*/
 622 /* allocReg - allocates register of given type                     */
 623 /*-----------------------------------------------------------------*/
 624 static regs *
 625 allocReg (short type)
 626 {
 627
 628         debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
 629         //fprintf(stderr,"allocReg\n");
 630
 631
 632         return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
 633
 634 }
 635
 636
 637 /*-----------------------------------------------------------------*/
 638 /* dirregWithName - search for register by name                    */
 639 /*-----------------------------------------------------------------*/
 640 regs *
 641 dirregWithName (char *name)
 642 {
 643         int hkey;
 644         regs *reg;
 645
 646         if(!name)
 647                 return NULL;
 648
 649         /* hash the name to get a key */
 650
 651         hkey = regname2key(name);
 652
 653         reg = hTabFirstItemWK(dynDirectRegNames, hkey);
 654
 655         while(reg) {
 656
 657                 if(STRCASECMP(reg->name, name) == 0) {
 658                         return(reg);
 659                 }
 660
 661                 reg = hTabNextItemWK (dynDirectRegNames);
 662
 663         }
 664
 665         return NULL; // name wasn't found in the hash table
 666 }
 667
 668 int IS_CONFIG_ADDRESS(int address)
 669 {
 670
 671         return address == 0x2007;
 672 }
 673
 674 /*-----------------------------------------------------------------*/
 675 /* allocNewDirReg - allocates a new register of given type         */
 676 /*-----------------------------------------------------------------*/
 677 regs *
 678 allocNewDirReg (sym_link *symlnk,const char *name)
 679 {
 680         regs *reg;
 681         int address = 0;
 682
 683         /* if this is at an absolute address, then get the address. */
 684         if (SPEC_ABSA (symlnk) ) {
 685                 address = SPEC_ADDR (symlnk);
 686                 //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
 687         }
 688
 689         /* Register wasn't found in hash, so let's create
 690         * a new one and put it in the hash table AND in the
 691         * dynDirectRegNames set */
 692         if (IS_CONFIG_ADDRESS(address)) {
 693                 debugLog ("  -- %s is declared at address 0x2007\n",name);
 694                 reg = 0;
 695         } else {
 696                 int idx;
 697                 if (address) {
 698                         if (IS_BITVAR (symlnk))
 699                                 idx = address >> 3;
 700                         else
 701                                 idx = address;
 702                 } else {
 703                         idx = rDirectIdx++;
 704                 }
 705                 reg = newReg(REG_GPR, PO_DIR, idx, (char*)name,getSize (symlnk),0 );
 706                 debugLog ("  -- added %s to hash, size = %d\n", (char*)name,reg->size);
 707
 708                 if (SPEC_ABSA (symlnk) ) {
 709                         reg->type = REG_SFR;
 710                 }
 711
 712                 if (IS_BITVAR (symlnk)) {
 713                         addSet(&dynDirectBitRegs, reg);
 714                         reg->isBitField = 1;
 715                 } else
 716                         addSet(&dynDirectRegs, reg);
 717
 718                 if (!IS_STATIC (symlnk)) {
 719                         reg->isPublic = 1;
 720                 }
 721                 if (IS_EXTERN (symlnk)) {
 722                         reg->isExtern = 1;
 723                 }
 724
 725         }
 726
 727         if (address && reg) {
 728                 reg->isFixed = 1;
 729                 reg->address = address;
 730                 debugLog ("  -- and it is at a fixed address 0x%02x\n",reg->address);
 731         }
 732
 733         return reg;
 734 }
 735
 736 /*-----------------------------------------------------------------*/
 737 /* allocDirReg - allocates register of given type                  */
 738 /*-----------------------------------------------------------------*/
 739 regs *
 740 allocDirReg (operand *op )
 741 {
 742
 743         regs *reg;
 744         char *name;
 745
 746         if(!IS_SYMOP(op)) {
 747                 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
 748                 return NULL;
 749         }
 750
 751         name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
 752
 753         /* If the symbol is at a fixed address, then remove the leading underscore
 754         * from the name. This is hack to allow the .asm include file named registers
 755         * to match the .c declared register names */
 756
 757         //if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && (*name == '_'))
 758         //name++;
 759
 760         debugLog ("%s symbol name %s\n", __FUNCTION__,name);
 761         {
 762                 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
 763                         debugLog(" %d  const char\n",__LINE__);
 764                         debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
 765                 }
 766
 767                 debugLog("  %d  storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
 768                 if (IS_CODE ( OP_SYM_ETYPE(op)) )
 769                         debugLog(" %d  code space\n",__LINE__);
 770
 771                 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
 772                         debugLog(" %d  integral\n",__LINE__);
 773                 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
 774                         debugLog(" %d  literal\n",__LINE__);
 775                 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
 776                         debugLog(" %d  specifier\n",__LINE__);
 777                 debugAopGet(NULL, op);
 778         }
 779
 780         if (IS_CODE ( OP_SYM_ETYPE(op)) )
 781                 return NULL;
 782
 783         /* First, search the hash table to see if there is a register with this name */
 784         if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && !(IS_BITVAR (OP_SYM_ETYPE(op))) ) {
 785                 reg = regWithIdx (dynProcessorRegs, SPEC_ADDR ( OP_SYM_ETYPE(op)), 1);
 786                 /*
 787                 if(!reg)
 788                 fprintf(stderr,"ralloc %s is at fixed address but not a processor reg, addr=0x%x\n",
 789                 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
 790                 else
 791                 fprintf(stderr,"ralloc %s at fixed address has already been declared, addr=0x%x\n",
 792                 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
 793                 */
 794         } else {
 795                 //fprintf(stderr,"ralloc:%d %s \n", __LINE__,name);
 796
 797                 reg = dirregWithName(name);
 798         }
 799
 800 #if 0
 801         if(!reg) {
 802                 int address = 0;
 803
 804                 /* if this is at an absolute address, then get the address. */
 805                 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 806                         address = SPEC_ADDR ( OP_SYM_ETYPE(op));
 807                         //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
 808                 }
 809
 810                 /* Register wasn't found in hash, so let's create
 811                 * a new one and put it in the hash table AND in the
 812                 * dynDirectRegNames set */
 813                 if(!IS_CONFIG_ADDRESS(address)) {
 814                         //fprintf(stderr,"allocating new reg %s\n",name);
 815
 816                         reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0 );
 817                         debugLog ("  -- added %s to hash, size = %d\n", name,reg->size);
 818
 819                         //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
 820
 821                         if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 822
 823                                 //fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
 824                                 reg->type = REG_SFR;
 825                         }
 826
 827                         if (IS_BITVAR (OP_SYM_ETYPE(op))) {
 828                                 addSet(&dynDirectBitRegs, reg);
 829                                 reg->isBitField = 1;
 830                         } else
 831                                 addSet(&dynDirectRegs, reg);
 832
 833                         if (!IS_STATIC (OP_SYM_ETYPE(op))) {
 834                                 reg->isPublic = 1;
 835                         }
 836                         if (IS_EXTERN (OP_SYM_ETYPE(op))) {
 837                                 reg->isExtern = 1;
 838                         }
 839
 840
 841                 } else {
 842                         debugLog ("  -- %s is declared at address 0x2007\n",name);
 843
 844                 }
 845         }
 846
 847         if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 848                 reg->isFixed = 1;
 849                 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
 850                 debugLog ("  -- and it is at a fixed address 0x%02x\n",reg->address);
 851         }
 852 #endif
 853
 854         if(reg) {
 855                 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 856                         reg->isFixed = 1;
 857                         reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
 858                         debugLog ("  -- and it is at a fixed address 0x%02x\n",reg->address);
 859                 }
 860         } else {
 861                 allocNewDirReg (OP_SYM_ETYPE(op),name);
 862         }
 863
 864         return reg;
 865 }
 866
 867
 868 /*-----------------------------------------------------------------*/
 869 /* allocRegByName - allocates register with given name             */
 870 /*-----------------------------------------------------------------*/
 871 regs *
 872 allocRegByName (char *name, int size)
 873 {
 874
 875         regs *reg;
 876
 877         if(!name) {
 878                 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
 879                 exit(1);
 880         }
 881
 882         /* First, search the hash table to see if there is a register with this name */
 883         reg = dirregWithName(name);
 884
 885
 886         if(!reg) {
 887                 int found = 0;
 888                 symbol *sym;
 889                 /* Register wasn't found in hash, so let's create
 890                 * a new one and put it in the hash table AND in the
 891                 * dynDirectRegNames set */
 892                 //fprintf (stderr,"%s symbol name %s\n", __FUNCTION__,name);
 893                 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0 );
 894                 for (sym = setFirstItem(sfr->syms); sym; sym = setNextItem(sfr->syms)) {
 895                         if (strcmp(reg->name+1,sym->name)==0) {
 896                                 unsigned a = SPEC_ADDR(sym->etype);
 897                                 reg->address = a;
 898                                 reg->isFixed = 1;
 899                                 reg->type = REG_SFR;
 900                                 if (!IS_STATIC (sym->etype)) {
 901                                         reg->isPublic = 1;
 902                                 }
 903                                 if (IS_EXTERN (sym->etype)) {
 904                                         reg->isExtern = 1;
 905                                 }
 906                                 if (IS_BITVAR (sym->etype))
 907                                         reg->isBitField = 1;
 908                                 found = 1;
 909                                 break;
 910                         }
 911                 }
 912                 if (!found) {
 913                         for (sym = setFirstItem(data->syms); sym; sym = setNextItem(data->syms)) {
 914                                 if (strcmp(reg->name+1,sym->name)==0) {
 915                                         unsigned a = SPEC_ADDR(sym->etype);
 916                                         reg->address = a;
 917                                         if (!IS_STATIC (sym->etype)) {
 918                                                 reg->isPublic = 1;
 919                                         }
 920                                         if (IS_EXTERN (sym->etype)) {
 921                                                 reg->isExtern = 1;
 922                                         }
 923                                         if (IS_BITVAR (sym->etype))
 924                                                 reg->isBitField = 1;
 925                                         found = 1;
 926                                         break;
 927                                 }
 928                         }
 929                 }
 930
 931                 debugLog ("  -- added %s to hash, size = %d\n", name,reg->size);
 932
 933                 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
 934                 if (reg->isBitField) {
 935                         addSet(&dynDirectBitRegs, reg);
 936                 } else
 937                         addSet(&dynDirectRegs, reg);
 938         }
 939
 940         return reg;
 941 }
 942
 943 /*-----------------------------------------------------------------*/
 944 /* RegWithIdx - returns pointer to register with index number       */
 945 /*-----------------------------------------------------------------*/
 946 regs *
 947 typeRegWithIdx (int idx, int type, int fixed)
 948 {
 949
 950         regs *dReg;
 951
 952         debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
 953
 954         switch (type) {
 955
 956         case REG_GPR:
 957                 if( (dReg = regWithIdx ( dynAllocRegs, idx, fixed)) != NULL) {
 958
 959                         debugLog ("Found a Dynamic Register!\n");
 960                         return dReg;
 961                 }
 962                 if( (dReg = regWithIdx ( dynDirectRegs, idx, fixed)) != NULL ) {
 963                         debugLog ("Found a Direct Register!\n");
 964                         return dReg;
 965                 }
 966
 967                 break;
 968         case REG_STK:
 969                 if( (dReg = regWithIdx ( dynStackRegs, idx, fixed)) != NULL ) {
 970                         debugLog ("Found a Stack Register!\n");
 971                         return dReg;
 972                 }
 973                 break;
 974         case REG_SFR:
 975                 if( (dReg = regWithIdx ( dynProcessorRegs, idx, fixed)) != NULL ) {
 976                         debugLog ("Found a Processor Register!\n");
 977                         return dReg;
 978                 }
 979
 980         case REG_CND:
 981         case REG_PTR:
 982         default:
 983                 break;
 984         }
 985
 986
 987         return NULL;
 988 }
 989
 990 /*-----------------------------------------------------------------*/
 991 /* pic14_regWithIdx - returns pointer to register with index number*/
 992 /*-----------------------------------------------------------------*/
 993 regs *
 994 pic14_regWithIdx (int idx)
 995 {
 996         regs *dReg;
 997
 998         if( (dReg = typeRegWithIdx(idx,REG_GPR,0)) != NULL)
 999                 return dReg;
1000
1001         if( (dReg = typeRegWithIdx(idx,REG_SFR,0)) != NULL)
1002                 return dReg;
1003
1004         return NULL;
1005 }
1006
1007 /*-----------------------------------------------------------------*/
1008 /* pic14_regWithIdx - returns pointer to register with index number       */
1009 /*-----------------------------------------------------------------*/
1010 regs *
1011 pic14_allocWithIdx (int idx)
1012 {
1013
1014         regs *dReg;
1015
1016         debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
1017
1018         if( (dReg = regWithIdx ( dynAllocRegs, idx,0)) != NULL) {
1019
1020                 debugLog ("Found a Dynamic Register!\n");
1021         } else if( (dReg = regWithIdx ( dynStackRegs, idx,0)) != NULL ) {
1022                 debugLog ("Found a Stack Register!\n");
1023         } else if( (dReg = regWithIdx ( dynProcessorRegs, idx,0)) != NULL ) {
1024                 debugLog ("Found a Processor Register!\n");
1025         } else if( (dReg = regWithIdx ( dynInternalRegs, idx,0)) != NULL ) {
1026                 debugLog ("Found an Internal Register!\n");
1027         } else if( (dReg = regWithIdx ( dynInternalRegs, idx,1)) != NULL ) {
1028                 debugLog ("Found an Internal Register!\n");
1029         } else {
1030
1031                 debugLog ("Dynamic Register not found\n");
1032
1033
1034                 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
1035                 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1036                         "regWithIdx not found");
1037                 exit (1);
1038
1039         }
1040
1041         dReg->wasUsed = 1;
1042         dReg->isFree = 0;
1043
1044         return dReg;
1045 }
1046 /*-----------------------------------------------------------------*/
1047 /*-----------------------------------------------------------------*/
1048 regs *
1049 pic14_findFreeReg(short type)
1050 {
1051         //  int i;
1052         regs* dReg;
1053
1054         switch (type) {
1055         case REG_GPR:
1056                 if((dReg = regFindFree(dynAllocRegs)) != NULL)
1057                         return dReg;
1058                 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
1059
1060         case REG_STK:
1061
1062                 if((dReg = regFindFree(dynStackRegs)) != NULL)
1063                         return dReg;
1064
1065                 return NULL;
1066
1067         case REG_PTR:
1068         case REG_CND:
1069         case REG_SFR:
1070         default:
1071                 return NULL;
1072         }
1073 }
1074 /*-----------------------------------------------------------------*/
1075 /* freeReg - frees a register                                      */
1076 /*-----------------------------------------------------------------*/
1077 static void
1078 freeReg (regs * reg)
1079 {
1080         debugLog ("%s\n", __FUNCTION__);
1081         reg->isFree = 1;
1082 }
1083
1084
1085 /*-----------------------------------------------------------------*/
1086 /* nFreeRegs - returns number of free registers                    */
1087 /*-----------------------------------------------------------------*/
1088 static int
1089 nFreeRegs (int type)
1090 {
1091 /* dynamically allocate as many as we need and worry about
1092         * fitting them into a PIC later */
1093
1094         return 100;
1095 #if 0
1096         int i;
1097         int nfr = 0;
1098
1099         debugLog ("%s\n", __FUNCTION__);
1100         for (i = 0; i < pic14_nRegs; i++)
1101                 if (regspic14[i].isFree && regspic14[i].type == type)
1102                         nfr++;
1103                 return nfr;
1104 #endif
1105 }
1106
1107 /*-----------------------------------------------------------------*/
1108 /* nfreeRegsType - free registers with type                         */
1109 /*-----------------------------------------------------------------*/
1110 static int
1111 nfreeRegsType (int type)
1112 {
1113         int nfr;
1114         debugLog ("%s\n", __FUNCTION__);
1115         if (type == REG_PTR)
1116         {
1117                 if ((nfr = nFreeRegs (type)) == 0)
1118                         return nFreeRegs (REG_GPR);
1119         }
1120
1121         return nFreeRegs (type);
1122 }
1123
1124 void writeSetUsedRegs(FILE *of, set *dRegs)
1125 {
1126
1127         regs *dReg;
1128
1129         for (dReg = setFirstItem(dRegs) ; dReg ;
1130         dReg = setNextItem(dRegs)) {
1131
1132                 if(dReg->wasUsed)
1133                         fprintf (of, "\t%s\n",dReg->name);
1134         }
1135
1136 }
1137 extern void assignFixedRegisters(set *regset);
1138 extern void assignRelocatableRegisters(set *regset,int used);
1139 extern void dump_map(void);
1140 extern void dump_sfr(FILE *of);
1141
1142 void packBits(set *bregs)
1143 {
1144         set *regset;
1145         regs *breg;
1146         regs *bitfield=NULL;
1147         regs *relocbitfield=NULL;
1148         int bit_no=0;
1149         int byte_no=-1;
1150         char buffer[20];
1151
1152
1153         for (regset = bregs ; regset ;
1154         regset = regset->next) {
1155
1156                 breg = regset->item;
1157                 breg->isBitField = 1;
1158                 //fprintf(stderr,"bit reg: %s\n",breg->name);
1159
1160                 if(breg->isFixed) {
1161                         //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
1162
1163                         bitfield = typeRegWithIdx (breg->address >> 3, -1 , 1);
1164                         breg->rIdx = breg->address & 7;
1165                         breg->address >>= 3;
1166
1167                         if(!bitfield) {
1168                                 //sprintf (buffer, "fbitfield%02x", breg->address);
1169                                 sprintf (buffer, "0x%02x", breg->address);
1170                                 //fprintf(stderr,"new bit field\n");
1171                                 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0);
1172                                 bitfield->isBitField = 1;
1173                                 bitfield->isFixed = 1;
1174                                 bitfield->address = breg->address;
1175                                 //addSet(&dynDirectRegs,bitfield);
1176                                 addSet(&dynInternalRegs,bitfield);
1177                                 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
1178                         } else {
1179                                 //fprintf(stderr,"  which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
1180                                 ;
1181                         }
1182                         breg->reg_alias = bitfield;
1183                         bitfield = NULL;
1184
1185                 } else {
1186                         if(!relocbitfield || bit_no >7) {
1187                                 byte_no++;
1188                                 bit_no=0;
1189                                 sprintf (buffer, "bitfield%d", byte_no);
1190                                 //fprintf(stderr,"new relocatable bit field\n");
1191                                 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0);
1192                                 relocbitfield->isBitField = 1;
1193                                 //addSet(&dynDirectRegs,relocbitfield);
1194                                 addSet(&dynInternalRegs,relocbitfield);
1195                                 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1196
1197                         }
1198
1199                         breg->reg_alias = relocbitfield;
1200                         breg->address = rDirectIdx;   /* byte_no; */
1201                         breg->rIdx = bit_no++;
1202                 }
1203         }
1204
1205 }
1206
1207
1208
1209 void bitEQUs(FILE *of, set *bregs)
1210 {
1211         regs *breg,*bytereg;
1212         int bit_no=0;
1213
1214         //fprintf(stderr," %s\n",__FUNCTION__);
1215         for (breg = setFirstItem(bregs) ; breg ;
1216         breg = setNextItem(bregs)) {
1217
1218                 //fprintf(stderr,"bit reg: %s\n",breg->name);
1219
1220                 bytereg = breg->reg_alias;
1221                 if(bytereg)
1222                         fprintf (of, "%s\tEQU\t( (%s<<3)+%d)\n",
1223                         breg->name,
1224                         bytereg->name,
1225                         breg->rIdx & 0x0007);
1226
1227                 else {
1228                         //fprintf(stderr, "bit field is not assigned to a register\n");
1229                         fprintf (of, "%s\tEQU\t( (bitfield%d<<3)+%d)\n",
1230                                 breg->name,
1231                                 bit_no>>3,
1232                                 bit_no & 0x0007);
1233
1234                         bit_no++;
1235                 }
1236         }
1237
1238 }
1239 void aliasEQUs(FILE *of, set *fregs, int use_rIdx)
1240 {
1241         regs *reg;
1242
1243
1244         for (reg = setFirstItem(fregs) ; reg ;
1245         reg = setNextItem(fregs)) {
1246
1247                 //if(!reg->isEmitted && reg->wasUsed) {
1248                 if(reg->wasUsed) {
1249                         if(use_rIdx)
1250                                 fprintf (of, "%s\tEQU\t0x%03x\n",
1251                                 reg->name,
1252                                 reg->rIdx);
1253                         else
1254                                 fprintf (of, "%s\tEQU\t0x%03x\n",
1255                                 reg->name,
1256                                 reg->address);
1257                 }
1258         }
1259
1260 }
1261
1262 void writeUsedRegs(FILE *of)
1263 {
1264         packBits(dynDirectBitRegs);
1265
1266         assignFixedRegisters(dynInternalRegs);
1267         assignFixedRegisters(dynAllocRegs);
1268         assignFixedRegisters(dynStackRegs);
1269         assignFixedRegisters(dynDirectRegs);
1270
1271         assignRelocatableRegisters(dynInternalRegs,0);
1272         assignRelocatableRegisters(dynAllocRegs,0);
1273         assignRelocatableRegisters(dynStackRegs,0);
1274
1275         /*
1276         assignRelocatableRegisters(dynDirectRegs,0);
1277         printf("assignRelocatableRegisters(dynDirectRegs,0);\n");
1278         */
1279         //dump_map();
1280
1281         dump_sfr(of);
1282         bitEQUs(of,dynDirectBitRegs);
1283         /*
1284         aliasEQUs(of,dynAllocRegs,0);
1285         aliasEQUs(of,dynDirectRegs,0);
1286         aliasEQUs(of,dynStackRegs,0);
1287         aliasEQUs(of,dynProcessorRegs,1);
1288         */
1289 }
1290
1291 #if 0
1292 /*-----------------------------------------------------------------*/
1293 /* allDefsOutOfRange - all definitions are out of a range          */
1294 /*-----------------------------------------------------------------*/
1295 static bool
1296 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
1297 {
1298         int i;
1299
1300         debugLog ("%s\n", __FUNCTION__);
1301         if (!defs)
1302                 return TRUE;
1303
1304         for (i = 0; i < defs->size; i++)
1305         {
1306                 iCode *ic;
1307
1308                 if (bitVectBitValue (defs, i) &&
1309                         (ic = hTabItemWithKey (iCodehTab, i)) &&
1310                         (ic->seq >= fseq && ic->seq <= toseq))
1311
1312                         return FALSE;
1313
1314         }
1315
1316         return TRUE;
1317 }
1318 #endif
1319
1320 /*-----------------------------------------------------------------*/
1321 /* computeSpillable - given a point find the spillable live ranges */
1322 /*-----------------------------------------------------------------*/
1323 static bitVect *
1324 computeSpillable (iCode * ic)
1325 {
1326         bitVect *spillable;
1327
1328         debugLog ("%s\n", __FUNCTION__);
1329         /* spillable live ranges are those that are live at this
1330         point . the following categories need to be subtracted
1331         from this set.
1332         a) - those that are already spilt
1333         b) - if being used by this one
1334         c) - defined by this one */
1335
1336         spillable = bitVectCopy (ic->rlive);
1337         spillable =
1338                 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1339         spillable =
1340                 bitVectCplAnd (spillable, ic->uses);    /* used in this one */
1341         bitVectUnSetBit (spillable, ic->defKey);
1342         spillable = bitVectIntersect (spillable, _G.regAssigned);
1343         return spillable;
1344
1345 }
1346
1347 /*-----------------------------------------------------------------*/
1348 /* noSpilLoc - return true if a variable has no spil location      */
1349 /*-----------------------------------------------------------------*/
1350 static int
1351 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1352 {
1353         debugLog ("%s\n", __FUNCTION__);
1354         return (sym->usl.spillLoc ? 0 : 1);
1355 }
1356
1357 /*-----------------------------------------------------------------*/
1358 /* hasSpilLoc - will return 1 if the symbol has spil location      */
1359 /*-----------------------------------------------------------------*/
1360 static int
1361 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1362 {
1363         debugLog ("%s\n", __FUNCTION__);
1364         return (sym->usl.spillLoc ? 1 : 0);
1365 }
1366
1367 /*-----------------------------------------------------------------*/
1368 /* directSpilLoc - will return 1 if the splilocation is in direct  */
1369 /*-----------------------------------------------------------------*/
1370 static int
1371 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1372 {
1373         debugLog ("%s\n", __FUNCTION__);
1374         if (sym->usl.spillLoc &&
1375                 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1376                 return 1;
1377         else
1378                 return 0;
1379 }
1380
1381 /*-----------------------------------------------------------------*/
1382 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1383 /*                    but is not used as a pointer                 */
1384 /*-----------------------------------------------------------------*/
1385 static int
1386 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1387 {
1388         debugLog ("%s\n", __FUNCTION__);
1389         return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1390 }
1391
1392 /*-----------------------------------------------------------------*/
1393 /* rematable - will return 1 if the remat flag is set              */
1394 /*-----------------------------------------------------------------*/
1395 static int
1396 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1397 {
1398         debugLog ("%s\n", __FUNCTION__);
1399         return sym->remat;
1400 }
1401
1402 /*-----------------------------------------------------------------*/
1403 /* notUsedInRemaining - not used or defined in remain of the block */
1404 /*-----------------------------------------------------------------*/
1405 static int
1406 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1407 {
1408         debugLog ("%s\n", __FUNCTION__);
1409         return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1410                 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1411 }
1412
1413 /*-----------------------------------------------------------------*/
1414 /* allLRs - return true for all                                    */
1415 /*-----------------------------------------------------------------*/
1416 static int
1417 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1418 {
1419         debugLog ("%s\n", __FUNCTION__);
1420         return 1;
1421 }
1422
1423 /*-----------------------------------------------------------------*/
1424 /* liveRangesWith - applies function to a given set of live range  */
1425 /*-----------------------------------------------------------------*/
1426 static set *
1427 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1428                                 eBBlock * ebp, iCode * ic)
1429 {
1430         set *rset = NULL;
1431         int i;
1432
1433         debugLog ("%s\n", __FUNCTION__);
1434         if (!lrs || !lrs->size)
1435                 return NULL;
1436
1437         for (i = 1; i < lrs->size; i++)
1438         {
1439                 symbol *sym;
1440                 if (!bitVectBitValue (lrs, i))
1441                         continue;
1442
1443                         /* if we don't find it in the live range
1444                 hash table we are in serious trouble */
1445                 if (!(sym = hTabItemWithKey (liveRanges, i)))
1446                 {
1447                         werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1448                                 "liveRangesWith could not find liveRange");
1449                         exit (1);
1450                 }
1451
1452                 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1453                         addSetHead (&rset, sym);
1454         }
1455
1456         return rset;
1457 }
1458
1459
1460 /*-----------------------------------------------------------------*/
1461 /* leastUsedLR - given a set determines which is the least used    */
1462 /*-----------------------------------------------------------------*/
1463 static symbol *
1464 leastUsedLR (set * sset)
1465 {
1466         symbol *sym = NULL, *lsym = NULL;
1467
1468         debugLog ("%s\n", __FUNCTION__);
1469         sym = lsym = setFirstItem (sset);
1470
1471         if (!lsym)
1472                 return NULL;
1473
1474         for (; lsym; lsym = setNextItem (sset))
1475         {
1476
1477         /* if usage is the same then prefer
1478                 the spill the smaller of the two */
1479                 if (lsym->used == sym->used)
1480                         if (getSize (lsym->type) < getSize (sym->type))
1481                                 sym = lsym;
1482
1483                         /* if less usage */
1484                         if (lsym->used < sym->used)
1485                                 sym = lsym;
1486
1487         }
1488
1489         setToNull ((void *) &sset);
1490         sym->blockSpil = 0;
1491         return sym;
1492 }
1493
1494 /*-----------------------------------------------------------------*/
1495 /* noOverLap - will iterate through the list looking for over lap  */
1496 /*-----------------------------------------------------------------*/
1497 static int
1498 noOverLap (set * itmpStack, symbol * fsym)
1499 {
1500         symbol *sym;
1501         debugLog ("%s\n", __FUNCTION__);
1502
1503
1504         for (sym = setFirstItem (itmpStack); sym;
1505         sym = setNextItem (itmpStack))
1506         {
1507                 if (sym->liveTo > fsym->liveFrom)
1508                         return 0;
1509
1510         }
1511
1512         return 1;
1513 }
1514
1515 /*-----------------------------------------------------------------*/
1516 /* isFree - will return 1 if the a free spil location is found     */
1517 /*-----------------------------------------------------------------*/
1518 static
1519 DEFSETFUNC (isFree)
1520 {
1521         symbol *sym = item;
1522         V_ARG (symbol **, sloc);
1523         V_ARG (symbol *, fsym);
1524
1525         debugLog ("%s\n", __FUNCTION__);
1526         /* if already found */
1527         if (*sloc)
1528                 return 0;
1529
1530                 /* if it is free && and the itmp assigned to
1531                 this does not have any overlapping live ranges
1532                 with the one currently being assigned and
1533         the size can be accomodated  */
1534         if (sym->isFree &&
1535                 noOverLap (sym->usl.itmpStack, fsym) &&
1536                 getSize (sym->type) >= getSize (fsym->type))
1537         {
1538                 *sloc = sym;
1539                 return 1;
1540         }
1541
1542         return 0;
1543 }
1544
1545 /*-----------------------------------------------------------------*/
1546 /* spillLRWithPtrReg :- will spil those live ranges which use PTR  */
1547 /*-----------------------------------------------------------------*/
1548 static void
1549 spillLRWithPtrReg (symbol * forSym)
1550 {
1551         symbol *lrsym;
1552         regs *r0, *r1;
1553         int k;
1554
1555         debugLog ("%s\n", __FUNCTION__);
1556         if (!_G.regAssigned ||
1557                 bitVectIsZero (_G.regAssigned))
1558                 return;
1559
1560         r0 = pic14_regWithIdx (R0_IDX);
1561         r1 = pic14_regWithIdx (R1_IDX);
1562
1563         /* for all live ranges */
1564         for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1565         lrsym = hTabNextItem (liveRanges, &k))
1566         {
1567                 int j;
1568
1569                 /* if no registers assigned to it or
1570                 spilt */
1571                 /* if it does not overlap with this then
1572                 not need to spill it */
1573
1574                 if (lrsym->isspilt || !lrsym->nRegs ||
1575                         (lrsym->liveTo < forSym->liveFrom))
1576                         continue;
1577
1578                         /* go thru the registers : if it is either
1579                 r0 or r1 then spil it */
1580                 for (j = 0; j < lrsym->nRegs; j++)
1581                         if (lrsym->regs[j] == r0 ||
1582                                 lrsym->regs[j] == r1)
1583                         {
1584                                 spillThis (lrsym);
1585                                 break;
1586                         }
1587         }
1588
1589 }
1590
1591 /*-----------------------------------------------------------------*/
1592 /* createStackSpil - create a location on the stack to spil        */
1593 /*-----------------------------------------------------------------*/
1594 static symbol *
1595 createStackSpil (symbol * sym)
1596 {
1597         symbol *sloc = NULL;
1598         int useXstack, model, noOverlay;
1599
1600         char slocBuffer[30];
1601         debugLog ("%s\n", __FUNCTION__);
1602
1603         /* first go try and find a free one that is already
1604         existing on the stack */
1605         if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1606         {
1607                 /* found a free one : just update & return */
1608                 sym->usl.spillLoc = sloc;
1609                 sym->stackSpil = 1;
1610                 sloc->isFree = 0;
1611                 addSetHead (&sloc->usl.itmpStack, sym);
1612                 return sym;
1613         }
1614
1615         /* could not then have to create one , this is the hard part
1616         we need to allocate this on the stack : this is really a
1617         hack!! but cannot think of anything better at this time */
1618
1619         if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1620         {
1621                 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1622                         __FILE__, __LINE__);
1623                 exit (1);
1624         }
1625
1626         sloc = newiTemp (slocBuffer);
1627
1628         /* set the type to the spilling symbol */
1629         sloc->type = copyLinkChain (sym->type);
1630         sloc->etype = getSpec (sloc->type);
1631         SPEC_SCLS (sloc->etype) = S_DATA;
1632         SPEC_EXTR (sloc->etype) = 0;
1633         SPEC_STAT (sloc->etype) = 0;
1634
1635         /* we don't allow it to be allocated`
1636         onto the external stack since : so we
1637         temporarily turn it off ; we also
1638         turn off memory model to prevent
1639         the spil from going to the external storage
1640         and turn off overlaying
1641         */
1642
1643         useXstack = options.useXstack;
1644         model = options.model;
1645         noOverlay = options.noOverlay;
1646         options.noOverlay = 1;
1647         options.model = options.useXstack = 0;
1648
1649         allocLocal (sloc);
1650
1651         options.useXstack = useXstack;
1652         options.model = model;
1653         options.noOverlay = noOverlay;
1654         sloc->isref = 1;                /* to prevent compiler warning */
1655
1656         /* if it is on the stack then update the stack */
1657         if (IN_STACK (sloc->etype))
1658         {
1659                 currFunc->stack += getSize (sloc->type);
1660                 _G.stackExtend += getSize (sloc->type);
1661         }
1662         else
1663                 _G.dataExtend += getSize (sloc->type);
1664
1665         /* add it to the _G.stackSpil set */
1666         addSetHead (&_G.stackSpil, sloc);
1667         sym->usl.spillLoc = sloc;
1668         sym->stackSpil = 1;
1669
1670         /* add it to the set of itempStack set
1671         of the spill location */
1672         addSetHead (&sloc->usl.itmpStack, sym);
1673         return sym;
1674 }
1675
1676 /*-----------------------------------------------------------------*/
1677 /* isSpiltOnStack - returns true if the spil location is on stack  */
1678 /*-----------------------------------------------------------------*/
1679 static bool
1680 isSpiltOnStack (symbol * sym)
1681 {
1682         sym_link *etype;
1683
1684         debugLog ("%s\n", __FUNCTION__);
1685         if (!sym)
1686                 return FALSE;
1687
1688         if (!sym->isspilt)
1689                 return FALSE;
1690
1691         /*     if (sym->_G.stackSpil) */
1692         /*      return TRUE; */
1693
1694         if (!sym->usl.spillLoc)
1695                 return FALSE;
1696
1697         etype = getSpec (sym->usl.spillLoc->type);
1698         if (IN_STACK (etype))
1699                 return TRUE;
1700
1701         return FALSE;
1702 }
1703
1704 /*-----------------------------------------------------------------*/
1705 /* spillThis - spils a specific operand                            */
1706 /*-----------------------------------------------------------------*/
1707 static void
1708 spillThis (symbol * sym)
1709 {
1710         int i;
1711         debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1712
1713         /* if this is rematerializable or has a spillLocation
1714         we are okay, else we need to create a spillLocation
1715         for it */
1716         if (!(sym->remat || sym->usl.spillLoc))
1717                 createStackSpil (sym);
1718
1719
1720         /* mark it has spilt & put it in the spilt set */
1721         sym->isspilt = 1;
1722         _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1723
1724         bitVectUnSetBit (_G.regAssigned, sym->key);
1725
1726         for (i = 0; i < sym->nRegs; i++)
1727
1728                 if (sym->regs[i])
1729                 {
1730                         freeReg (sym->regs[i]);
1731                         sym->regs[i] = NULL;
1732                 }
1733
1734                 /* if spilt on stack then free up r0 & r1
1735                 if they could have been assigned to some
1736                 LIVE ranges */
1737                 if (!pic14_ptrRegReq && isSpiltOnStack (sym))
1738                 {
1739                         pic14_ptrRegReq++;
1740                         spillLRWithPtrReg (sym);
1741                 }
1742
1743                 if (sym->usl.spillLoc && !sym->remat)
1744                         sym->usl.spillLoc->allocreq = 1;
1745                 return;
1746 }
1747
1748 /*-----------------------------------------------------------------*/
1749 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1750 /*-----------------------------------------------------------------*/
1751 static symbol *
1752 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1753 {
1754         bitVect *lrcs = NULL;
1755         set *selectS;
1756         symbol *sym;
1757
1758         debugLog ("%s\n", __FUNCTION__);
1759         /* get the spillable live ranges */
1760         lrcs = computeSpillable (ic);
1761
1762         /* get all live ranges that are rematerizable */
1763         if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1764         {
1765
1766                 /* return the least used of these */
1767                 return leastUsedLR (selectS);
1768         }
1769
1770         /* get live ranges with spillLocations in direct space */
1771         if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1772         {
1773                 sym = leastUsedLR (selectS);
1774                 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1775                         sym->usl.spillLoc->rname :
1776                 sym->usl.spillLoc->name));
1777                 sym->spildir = 1;
1778                 /* mark it as allocation required */
1779                 sym->usl.spillLoc->allocreq = 1;
1780                 return sym;
1781         }
1782
1783         /* if the symbol is local to the block then */
1784         if (forSym->liveTo < ebp->lSeq)
1785         {
1786
1787         /* check if there are any live ranges allocated
1788                 to registers that are not used in this block */
1789                 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1790                 {
1791                         sym = leastUsedLR (selectS);
1792                         /* if this is not rematerializable */
1793                         if (!sym->remat)
1794                         {
1795                                 _G.blockSpil++;
1796                                 sym->blockSpil = 1;
1797                         }
1798                         return sym;
1799                 }
1800
1801                 /* check if there are any live ranges that not
1802                 used in the remainder of the block */
1803                 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1804                 {
1805                         sym = leastUsedLR (selectS);
1806                         if (!sym->remat)
1807                         {
1808                                 sym->remainSpil = 1;
1809                                 _G.blockSpil++;
1810                         }
1811                         return sym;
1812                 }
1813         }
1814
1815         /* find live ranges with spillocation && not used as pointers */
1816         if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1817         {
1818
1819                 sym = leastUsedLR (selectS);
1820                 /* mark this as allocation required */
1821                 sym->usl.spillLoc->allocreq = 1;
1822                 return sym;
1823         }
1824
1825         /* find live ranges with spillocation */
1826         if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1827         {
1828
1829                 sym = leastUsedLR (selectS);
1830                 sym->usl.spillLoc->allocreq = 1;
1831                 return sym;
1832         }
1833
1834         /* couldn't find then we need to create a spil
1835         location on the stack , for which one? the least
1836         used ofcourse */
1837         if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1838         {
1839
1840                 /* return a created spil location */
1841                 sym = createStackSpil (leastUsedLR (selectS));
1842                 sym->usl.spillLoc->allocreq = 1;
1843                 return sym;
1844         }
1845
1846         /* this is an extreme situation we will spill
1847         this one : happens very rarely but it does happen */
1848         spillThis (forSym);
1849         return forSym;
1850
1851 }
1852
1853 /*-----------------------------------------------------------------*/
1854 /* spilSomething - spil some variable & mark registers as free     */
1855 /*-----------------------------------------------------------------*/
1856 static bool
1857 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1858 {
1859         symbol *ssym;
1860         int i;
1861
1862         debugLog ("%s\n", __FUNCTION__);
1863         /* get something we can spil */
1864         ssym = selectSpil (ic, ebp, forSym);
1865
1866         /* mark it as spilt */
1867         ssym->isspilt = 1;
1868         _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1869
1870         /* mark it as not register assigned &
1871         take it away from the set */
1872         bitVectUnSetBit (_G.regAssigned, ssym->key);
1873
1874         /* mark the registers as free */
1875         for (i = 0; i < ssym->nRegs; i++)
1876                 if (ssym->regs[i])
1877                         freeReg (ssym->regs[i]);
1878
1879                 /* if spilt on stack then free up r0 & r1
1880                 if they could have been assigned to as gprs */
1881                 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1882                 {
1883                         pic14_ptrRegReq++;
1884                         spillLRWithPtrReg (ssym);
1885                 }
1886
1887                 /* if this was a block level spil then insert push & pop
1888                 at the start & end of block respectively */
1889                 if (ssym->blockSpil)
1890                 {
1891                         iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1892                         /* add push to the start of the block */
1893                         addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1894                                 ebp->sch->next : ebp->sch));
1895                         nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1896                         /* add pop to the end of the block */
1897                         addiCodeToeBBlock (ebp, nic, NULL);
1898                 }
1899
1900                 /* if spilt because not used in the remainder of the
1901                 block then add a push before this instruction and
1902                 a pop at the end of the block */
1903                 if (ssym->remainSpil)
1904                 {
1905
1906                         iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1907                         /* add push just before this instruction */
1908                         addiCodeToeBBlock (ebp, nic, ic);
1909
1910                         nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1911                         /* add pop to the end of the block */
1912                         addiCodeToeBBlock (ebp, nic, NULL);
1913                 }
1914
1915                 if (ssym == forSym)
1916                         return FALSE;
1917                 else
1918                         return TRUE;
1919 }
1920
1921 /*-----------------------------------------------------------------*/
1922 /* getRegPtr - will try for PTR if not a GPR type if not spil      */
1923 /*-----------------------------------------------------------------*/
1924 static regs *
1925 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1926 {
1927         regs *reg;
1928         int j;
1929
1930         debugLog ("%s\n", __FUNCTION__);
1931 tryAgain:
1932         /* try for a ptr type */
1933         if ((reg = allocReg (REG_PTR)))
1934                 return reg;
1935
1936         /* try for gpr type */
1937         if ((reg = allocReg (REG_GPR)))
1938                 return reg;
1939
1940         /* we have to spil */
1941         if (!spilSomething (ic, ebp, sym))
1942                 return NULL;
1943
1944         /* make sure partially assigned registers aren't reused */
1945         for (j=0; j<=sym->nRegs; j++)
1946                 if (sym->regs[j])
1947                         sym->regs[j]->isFree = 0;
1948
1949                         /* this looks like an infinite loop but
1950                 in really selectSpil will abort  */
1951                 goto tryAgain;
1952 }
1953
1954 /*-----------------------------------------------------------------*/
1955 /* getRegGpr - will try for GPR if not spil                        */
1956 /*-----------------------------------------------------------------*/
1957 static regs *
1958 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1959 {
1960         regs *reg;
1961         int j;
1962
1963         debugLog ("%s\n", __FUNCTION__);
1964 tryAgain:
1965         /* try for gpr type */
1966         if ((reg = allocReg (REG_GPR)))
1967                 return reg;
1968
1969         if (!pic14_ptrRegReq)
1970                 if ((reg = allocReg (REG_PTR)))
1971                         return reg;
1972
1973                 /* we have to spil */
1974                 if (!spilSomething (ic, ebp, sym))
1975                         return NULL;
1976
1977                 /* make sure partially assigned registers aren't reused */
1978                 for (j=0; j<=sym->nRegs; j++)
1979                         if (sym->regs[j])
1980                                 sym->regs[j]->isFree = 0;
1981
1982                                 /* this looks like an infinite loop but
1983                         in really selectSpil will abort  */
1984                         goto tryAgain;
1985 }
1986
1987 /*-----------------------------------------------------------------*/
1988 /* symHasReg - symbol has a given register                         */
1989 /*-----------------------------------------------------------------*/
1990 static bool
1991 symHasReg (symbol * sym, regs * reg)
1992 {
1993         int i;
1994
1995         debugLog ("%s\n", __FUNCTION__);
1996         for (i = 0; i < sym->nRegs; i++)
1997                 if (sym->regs[i] == reg)
1998                         return TRUE;
1999
2000                 return FALSE;
2001 }
2002
2003 /*-----------------------------------------------------------------*/
2004 /* deassignLRs - check the live to and if they have registers & are */
2005 /*               not spilt then free up the registers              */
2006 /*-----------------------------------------------------------------*/
2007 static void
2008 deassignLRs (iCode * ic, eBBlock * ebp)
2009 {
2010         symbol *sym;
2011         int k;
2012         symbol *result;
2013
2014         debugLog ("%s\n", __FUNCTION__);
2015         for (sym = hTabFirstItem (liveRanges, &k); sym;
2016         sym = hTabNextItem (liveRanges, &k))
2017         {
2018
2019                 symbol *psym = NULL;
2020                 /* if it does not end here */
2021                 if (sym->liveTo > ic->seq)
2022                         continue;
2023
2024                         /* if it was spilt on stack then we can
2025                 mark the stack spil location as free */
2026                 if (sym->isspilt)
2027                 {
2028                         if (sym->stackSpil)
2029                         {
2030                                 sym->usl.spillLoc->isFree = 1;
2031                                 sym->stackSpil = 0;
2032                         }
2033                         continue;
2034                 }
2035
2036                 if (!bitVectBitValue (_G.regAssigned, sym->key))
2037                         continue;
2038
2039                         /* special case check if this is an IFX &
2040                         the privious one was a pop and the
2041                         previous one was not spilt then keep track
2042                 of the symbol */
2043                 if (ic->op == IFX && ic->prev &&
2044                         ic->prev->op == IPOP &&
2045                         !ic->prev->parmPush &&
2046                         !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
2047                         psym = OP_SYMBOL (IC_LEFT (ic->prev));
2048
2049                 if (sym->nRegs)
2050                 {
2051                         int i = 0;
2052
2053                         bitVectUnSetBit (_G.regAssigned, sym->key);
2054
2055                         /* if the result of this one needs registers
2056                         and does not have it then assign it right
2057                         away */
2058                         if (IC_RESULT (ic) &&
2059                                 !(SKIP_IC2 (ic) ||      /* not a special icode */
2060                                 ic->op == JUMPTABLE ||
2061                                 ic->op == IFX ||
2062                                 ic->op == IPUSH ||
2063                                 ic->op == IPOP ||
2064                                 ic->op == RETURN ||
2065                                 POINTER_SET (ic)) &&
2066                                 (result = OP_SYMBOL (IC_RESULT (ic))) &&        /* has a result */
2067                                 result->liveTo > ic->seq &&     /* and will live beyond this */
2068                                 result->liveTo <= ebp->lSeq &&  /* does not go beyond this block */
2069                                 result->regType == sym->regType &&      /* same register types */
2070                                 result->nRegs &&        /* which needs registers */
2071                                 !result->isspilt &&     /* and does not already have them */
2072                                 !result->remat &&
2073                                 !bitVectBitValue (_G.regAssigned, result->key) &&
2074                                 /* the number of free regs + number of regs in this LR
2075                                 can accomodate the what result Needs */
2076                                 ((nfreeRegsType (result->regType) +
2077                                 sym->nRegs) >= result->nRegs)
2078                                 )
2079                         {
2080
2081                                 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2082                                         if (i < sym->nRegs)
2083                                                 result->regs[i] = sym->regs[i];
2084                                         else
2085                                                 result->regs[i] = getRegGpr (ic, ebp, result);
2086
2087                                         _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2088
2089                         }
2090
2091                         /* free the remaining */
2092                         for (; i < sym->nRegs; i++)
2093                         {
2094                                 if (psym)
2095                                 {
2096                                         if (!symHasReg (psym, sym->regs[i]))
2097                                                 freeReg (sym->regs[i]);
2098                                 }
2099                                 else
2100                                         freeReg (sym->regs[i]);
2101                         }
2102                 }
2103         }
2104 }
2105
2106
2107 /*-----------------------------------------------------------------*/
2108 /* reassignLR - reassign this to registers                         */
2109 /*-----------------------------------------------------------------*/
2110 static void
2111 reassignLR (operand * op)
2112 {
2113         symbol *sym = OP_SYMBOL (op);
2114         int i;
2115
2116         debugLog ("%s\n", __FUNCTION__);
2117         /* not spilt any more */
2118         sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2119         bitVectUnSetBit (_G.spiltSet, sym->key);
2120
2121         _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2122
2123         _G.blockSpil--;
2124
2125         for (i = 0; i < sym->nRegs; i++)
2126                 sym->regs[i]->isFree = 0;
2127 }
2128
2129 /*-----------------------------------------------------------------*/
2130 /* willCauseSpill - determines if allocating will cause a spill    */
2131 /*-----------------------------------------------------------------*/
2132 static int
2133 willCauseSpill (int nr, int rt)
2134 {
2135         debugLog ("%s\n", __FUNCTION__);
2136         /* first check if there are any avlb registers
2137         of te type required */
2138         if (rt == REG_PTR)
2139         {
2140         /* special case for pointer type
2141         if pointer type not avlb then
2142                 check for type gpr */
2143                 if (nFreeRegs (rt) >= nr)
2144                         return 0;
2145                 if (nFreeRegs (REG_GPR) >= nr)
2146                         return 0;
2147         }
2148         else
2149         {
2150                 if (pic14_ptrRegReq)
2151                 {
2152                         if (nFreeRegs (rt) >= nr)
2153                                 return 0;
2154                 }
2155                 else
2156                 {
2157                         if (nFreeRegs (REG_PTR) +
2158                                 nFreeRegs (REG_GPR) >= nr)
2159                                 return 0;
2160                 }
2161         }
2162
2163         debugLog (" ... yep it will (cause a spill)\n");
2164         /* it will cause a spil */
2165         return 1;
2166 }
2167
2168 /*-----------------------------------------------------------------*/
2169 /* positionRegs - the allocator can allocate same registers to res- */
2170 /* ult and operand, if this happens make sure they are in the same */
2171 /* position as the operand otherwise chaos results                 */
2172 /*-----------------------------------------------------------------*/
2173 static void
2174 positionRegs (symbol * result, symbol * opsym, int lineno)
2175 {
2176         int count = min (result->nRegs, opsym->nRegs);
2177         int i, j = 0, shared = 0;
2178
2179         debugLog ("%s\n", __FUNCTION__);
2180         /* if the result has been spilt then cannot share */
2181         if (opsym->isspilt)
2182                 return;
2183 again:
2184         shared = 0;
2185         /* first make sure that they actually share */
2186         for (i = 0; i < count; i++)
2187         {
2188                 for (j = 0; j < count; j++)
2189                 {
2190                         if (result->regs[i] == opsym->regs[j] && i != j)
2191                         {
2192                                 shared = 1;
2193                                 goto xchgPositions;
2194                         }
2195                 }
2196         }
2197 xchgPositions:
2198         if (shared)
2199         {
2200                 regs *tmp = result->regs[i];
2201                 result->regs[i] = result->regs[j];
2202                 result->regs[j] = tmp;
2203                 goto again;
2204         }
2205 }
2206
2207 /*-----------------------------------------------------------------*/
2208 /* serialRegAssign - serially allocate registers to the variables  */
2209 /*-----------------------------------------------------------------*/
2210 static void
2211 serialRegAssign (eBBlock ** ebbs, int count)
2212 {
2213         int i;
2214
2215         debugLog ("%s\n", __FUNCTION__);
2216         /* for all blocks */
2217         for (i = 0; i < count; i++)
2218         {
2219
2220                 iCode *ic;
2221
2222                 if (ebbs[i]->noPath &&
2223                         (ebbs[i]->entryLabel != entryLabel &&
2224                         ebbs[i]->entryLabel != returnLabel))
2225                         continue;
2226
2227                 /* of all instructions do */
2228                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2229                 {
2230
2231                         debugLog ("  op: %s\n", decodeOp (ic->op));
2232
2233                         /* if this is an ipop that means some live
2234                         range will have to be assigned again */
2235                         if (ic->op == IPOP)
2236                                 reassignLR (IC_LEFT (ic));
2237
2238                         /* if result is present && is a true symbol */
2239                         if (IC_RESULT (ic) && ic->op != IFX &&
2240                                 IS_TRUE_SYMOP (IC_RESULT (ic)))
2241                                 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2242
2243                                 /* take away registers from live
2244                         ranges that end at this instruction */
2245                         deassignLRs (ic, ebbs[i]);
2246
2247                         /* some don't need registers */
2248                         if (SKIP_IC2 (ic) ||
2249                                 ic->op == JUMPTABLE ||
2250                                 ic->op == IFX ||
2251                                 ic->op == IPUSH ||
2252                                 ic->op == IPOP ||
2253                                 (IC_RESULT (ic) && POINTER_SET (ic)))
2254                                 continue;
2255
2256                                 /* now we need to allocate registers
2257                         only for the result */
2258                         if (IC_RESULT (ic))
2259                         {
2260                                 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2261                                 bitVect *spillable;
2262                                 int willCS;
2263                                 int j;
2264                                 int ptrRegSet = 0;
2265
2266                                 /* if it does not need or is spilt
2267                                 or is already assigned to registers
2268                                 or will not live beyond this instructions */
2269                                 if (!sym->nRegs ||
2270                                         sym->isspilt ||
2271                                         bitVectBitValue (_G.regAssigned, sym->key) ||
2272                                         sym->liveTo <= ic->seq)
2273                                         continue;
2274
2275                                         /* if some liverange has been spilt at the block level
2276                                         and this one live beyond this block then spil this
2277                                 to be safe */
2278                                 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2279                                 {
2280                                         spillThis (sym);
2281                                         continue;
2282                                 }
2283                                 /* if trying to allocate this will cause
2284                                 a spill and there is nothing to spill
2285                                 or this one is rematerializable then
2286                                 spill this one */
2287                                 willCS = willCauseSpill (sym->nRegs, sym->regType);
2288                                 spillable = computeSpillable (ic);
2289                                 if (sym->remat ||
2290                                         (willCS && bitVectIsZero (spillable)))
2291                                 {
2292
2293                                         spillThis (sym);
2294                                         continue;
2295
2296                                 }
2297
2298                                 /* if it has a spillocation & is used less than
2299                                 all other live ranges then spill this */
2300                                 if (willCS) {
2301                                         if (sym->usl.spillLoc) {
2302                                                 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2303                                                         allLRs, ebbs[i], ic));
2304                                                 if (leastUsed && leastUsed->used > sym->used) {
2305                                                         spillThis (sym);
2306                                                         continue;
2307                                                 }
2308                                         } else {
2309                                         /* if none of the liveRanges have a spillLocation then better
2310                                                 to spill this one than anything else already assigned to registers */
2311                                                 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2312                                                         /* if this is local to this block then we might find a block spil */
2313                                                         if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2314                                                                 spillThis (sym);
2315                                                                 continue;
2316                                                         }
2317                                                 }
2318                                         }
2319                                 }
2320
2321                                 if (ic->op == RECEIVE)
2322                                         debugLog ("When I get clever, I'll optimize the receive logic\n");
2323
2324                                         /* if we need ptr regs for the right side
2325                                 then mark it */
2326                                 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2327                                         <= (unsigned) PTRSIZE)
2328                                 {
2329                                         pic14_ptrRegReq++;
2330                                         ptrRegSet = 1;
2331                                 }
2332                                 /* else we assign registers to it */
2333                                 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2334
2335                                 debugLog ("  %d - \n", __LINE__);
2336                                 if(debugF)
2337                                         bitVectDebugOn(_G.regAssigned, debugF);
2338                                 for (j = 0; j < sym->nRegs; j++)
2339                                 {
2340                                         if (sym->regType == REG_PTR)
2341                                                 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2342                                         else
2343                                                 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2344
2345                                                 /* if the allocation failed which means
2346                                         this was spilt then break */
2347                                         if (!sym->regs[j])
2348                                                 break;
2349                                 }
2350                                 debugLog ("  %d - \n", __LINE__);
2351
2352                                 /* if it shares registers with operands make sure
2353                                 that they are in the same position */
2354                                 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2355                                         OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2356                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2357                                         OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2358                                 /* do the same for the right operand */
2359                                 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2360                                         OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2361                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2362                                         OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2363
2364                                 debugLog ("  %d - \n", __LINE__);
2365                                 if (ptrRegSet)
2366                                 {
2367                                         debugLog ("  %d - \n", __LINE__);
2368                                         pic14_ptrRegReq--;
2369                                         ptrRegSet = 0;
2370                                 }
2371
2372                 }
2373         }
2374         }
2375 }
2376
2377 /*-----------------------------------------------------------------*/
2378 /* rUmaskForOp :- returns register mask for an operand             */
2379 /*-----------------------------------------------------------------*/
2380 static bitVect *
2381 rUmaskForOp (operand * op)
2382 {
2383         bitVect *rumask;
2384         symbol *sym;
2385         int j;
2386
2387         debugLog ("%s\n", __FUNCTION__);
2388         /* only temporaries are assigned registers */
2389         if (!IS_ITEMP (op))
2390                 return NULL;
2391
2392         sym = OP_SYMBOL (op);
2393
2394         /* if spilt or no registers assigned to it
2395         then nothing */
2396         if (sym->isspilt || !sym->nRegs)
2397                 return NULL;
2398
2399         rumask = newBitVect (pic14_nRegs);
2400
2401         for (j = 0; j < sym->nRegs; j++)
2402         {
2403                 rumask = bitVectSetBit (rumask,
2404                         sym->regs[j]->rIdx);
2405         }
2406
2407         return rumask;
2408 }
2409
2410 /*-----------------------------------------------------------------*/
2411 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2412 /*-----------------------------------------------------------------*/
2413 static bitVect *
2414 regsUsedIniCode (iCode * ic)
2415 {
2416         bitVect *rmask = newBitVect (pic14_nRegs);
2417
2418         debugLog ("%s\n", __FUNCTION__);
2419         /* do the special cases first */
2420         if (ic->op == IFX)
2421         {
2422                 rmask = bitVectUnion (rmask,
2423                         rUmaskForOp (IC_COND (ic)));
2424                 goto ret;
2425         }
2426
2427         /* for the jumptable */
2428         if (ic->op == JUMPTABLE)
2429         {
2430                 rmask = bitVectUnion (rmask,
2431                         rUmaskForOp (IC_JTCOND (ic)));
2432
2433                 goto ret;
2434         }
2435
2436         /* of all other cases */
2437         if (IC_LEFT (ic))
2438                 rmask = bitVectUnion (rmask,
2439                 rUmaskForOp (IC_LEFT (ic)));
2440
2441
2442         if (IC_RIGHT (ic))
2443                 rmask = bitVectUnion (rmask,
2444                 rUmaskForOp (IC_RIGHT (ic)));
2445
2446         if (IC_RESULT (ic))
2447                 rmask = bitVectUnion (rmask,
2448                 rUmaskForOp (IC_RESULT (ic)));
2449
2450 ret:
2451         return rmask;
2452 }
2453
2454 /*-----------------------------------------------------------------*/
2455 /* createRegMask - for each instruction will determine the regsUsed */
2456 /*-----------------------------------------------------------------*/
2457 static void
2458 createRegMask (eBBlock ** ebbs, int count)
2459 {
2460         int i;
2461
2462         debugLog ("%s\n", __FUNCTION__);
2463         /* for all blocks */
2464         for (i = 0; i < count; i++)
2465         {
2466                 iCode *ic;
2467
2468                 if (ebbs[i]->noPath &&
2469                         (ebbs[i]->entryLabel != entryLabel &&
2470                         ebbs[i]->entryLabel != returnLabel))
2471                         continue;
2472
2473                 /* for all instructions */
2474                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2475                 {
2476
2477                         int j;
2478
2479                         if (SKIP_IC2 (ic) || !ic->rlive)
2480                                 continue;
2481
2482                                 /* first mark the registers used in this
2483                         instruction */
2484                         ic->rUsed = regsUsedIniCode (ic);
2485                         _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2486
2487                         /* now create the register mask for those
2488                         registers that are in use : this is a
2489                         super set of ic->rUsed */
2490                         ic->rMask = newBitVect (pic14_nRegs + 1);
2491
2492                         /* for all live Ranges alive at this point */
2493                         for (j = 1; j < ic->rlive->size; j++)
2494                         {
2495                                 symbol *sym;
2496                                 int k;
2497
2498                                 /* if not alive then continue */
2499                                 if (!bitVectBitValue (ic->rlive, j))
2500                                         continue;
2501
2502                                 /* find the live range we are interested in */
2503                                 if (!(sym = hTabItemWithKey (liveRanges, j)))
2504                                 {
2505                                         werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2506                                                 "createRegMask cannot find live range");
2507                                         exit (0);
2508                                 }
2509
2510                                 /* if no register assigned to it */
2511                                 if (!sym->nRegs || sym->isspilt)
2512                                         continue;
2513
2514                                 /* for all the registers allocated to it */
2515                                 for (k = 0; k < sym->nRegs; k++)
2516                                         if (sym->regs[k])
2517                                                 ic->rMask =
2518                                                 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2519                         }
2520                 }
2521         }
2522 }
2523
2524 /*-----------------------------------------------------------------*/
2525 /* rematStr - returns the rematerialized string for a remat var    */
2526 /*-----------------------------------------------------------------*/
2527 static symbol *
2528 rematStr (symbol * sym)
2529 {
2530         char *s = buffer;
2531         iCode *ic = sym->rematiCode;
2532         symbol *psym = NULL;
2533
2534         debugLog ("%s\n", __FUNCTION__);
2535
2536         //printf ("%s\n", s);
2537
2538         /* if plus or minus print the right hand side */
2539
2540         if (ic->op == '+' || ic->op == '-') {
2541
2542                 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2543
2544                 sprintf (s, "(%s %c 0x%04x)",
2545                         OP_SYMBOL (IC_LEFT (ric))->rname,
2546                         ic->op,
2547                         (int) operandLitValue (IC_RIGHT (ic)));
2548
2549
2550                 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2551
2552                 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2553                 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2554
2555                 return psym;
2556         }
2557
2558         sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2559         psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2560
2561         //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2562         return psym;
2563 }
2564
2565 #if 0
2566 /*-----------------------------------------------------------------*/
2567 /* rematStr - returns the rematerialized string for a remat var    */
2568 /*-----------------------------------------------------------------*/
2569 static char *
2570 rematStr (symbol * sym)
2571 {
2572         char *s = buffer;
2573         iCode *ic = sym->rematiCode;
2574
2575         debugLog ("%s\n", __FUNCTION__);
2576         while (1)
2577         {
2578
2579                 printf ("%s\n", s);
2580                 /* if plus or minus print the right hand side */
2581                 /*
2582                 if (ic->op == '+' || ic->op == '-') {
2583                 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2584                 ic->op );
2585                 s += strlen(s);
2586                 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2587                 continue ;
2588                 }
2589                 */
2590                 if (ic->op == '+' || ic->op == '-')
2591                 {
2592                         iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2593                         sprintf (s, "(%s %c 0x%04x)",
2594                                 OP_SYMBOL (IC_LEFT (ric))->rname,
2595                                 ic->op,
2596                                 (int) operandLitValue (IC_RIGHT (ic)));
2597
2598                         //s += strlen(s);
2599                         //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2600                         //continue ;
2601                         //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2602                         return buffer;
2603                 }
2604
2605                 /* we reached the end */
2606                 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2607                 break;
2608         }
2609
2610         printf ("%s\n", buffer);
2611         return buffer;
2612 }
2613 #endif
2614
2615 /*-----------------------------------------------------------------*/
2616 /* regTypeNum - computes the type & number of registers required   */
2617 /*-----------------------------------------------------------------*/
2618 static void
2619 regTypeNum ()
2620 {
2621         symbol *sym;
2622         int k;
2623         iCode *ic;
2624
2625         debugLog ("%s\n", __FUNCTION__);
2626         /* for each live range do */
2627         for (sym = hTabFirstItem (liveRanges, &k); sym;
2628         sym = hTabNextItem (liveRanges, &k)) {
2629
2630                 debugLog ("  %d - %s\n", __LINE__, sym->rname);
2631
2632                 /* if used zero times then no registers needed */
2633                 if ((sym->liveTo - sym->liveFrom) == 0)
2634                         continue;
2635
2636
2637                 /* if the live range is a temporary */
2638                 if (sym->isitmp) {
2639
2640                         debugLog ("  %d - itemp register\n", __LINE__);
2641
2642                         /* if the type is marked as a conditional */
2643                         if (sym->regType == REG_CND)
2644                                 continue;
2645
2646                                 /* if used in return only then we don't
2647                         need registers */
2648                         if (sym->accuse) {
2649                                 if (IS_AGGREGATE (sym->type) || sym->isptr)
2650                                         sym->type = aggrToPtr (sym->type, FALSE);
2651                                 debugLog ("  %d - no reg needed - accumulator used\n", __LINE__);
2652
2653                                 continue;
2654                         }
2655
2656                         if (sym->ruonly) {
2657                                 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2658                                 //  sym->type = aggrToPtr (sym->type, FALSE);
2659                                 debugLog ("  %d - used as a return\n", __LINE__);
2660
2661                                 //continue;
2662                         }
2663
2664                         /* if the symbol has only one definition &
2665                         that definition is a get_pointer and the
2666                         pointer we are getting is rematerializable and
2667                         in "data" space */
2668
2669                         if (bitVectnBitsOn (sym->defs) == 1 &&
2670                                 (ic = hTabItemWithKey (iCodehTab,
2671                                 bitVectFirstBit (sym->defs))) &&
2672                                 POINTER_GET (ic) &&
2673                                 !sym->noSpilLoc &&
2674                                 !IS_BITVAR (sym->etype)) {
2675
2676
2677                                 debugLog ("  %d - \n", __LINE__);
2678
2679                                 /* if remat in data space */
2680                                 if (OP_SYMBOL (IC_LEFT (ic))->remat &&
2681                                         DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER) {
2682
2683                                         /* create a psuedo symbol & force a spil */
2684                                         //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2685                                         symbol *psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2686                                         psym->type = sym->type;
2687                                         psym->etype = sym->etype;
2688                                         strcpy (psym->rname, psym->name);
2689                                         sym->isspilt = 1;
2690                                         sym->usl.spillLoc = psym;
2691                                         continue;
2692                                 }
2693
2694                                 /* if in data space or idata space then try to
2695                                 allocate pointer register */
2696
2697                         }
2698
2699                         /* if not then we require registers */
2700                         sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2701                                 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2702                         getSize (sym->type));
2703
2704
2705                         if(IS_PTR_CONST (sym->type)) {
2706                                 debugLog ("  %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2707                                 sym->nRegs = 2;
2708                         }
2709
2710                         if (sym->nRegs > 4) {
2711                                 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2712                                 printTypeChain (sym->type, stderr);
2713                                 fprintf (stderr, "\n");
2714                         }
2715
2716                         /* determine the type of register required */
2717                         if (sym->nRegs == 1 &&
2718                                 IS_PTR (sym->type) &&
2719                                 sym->uptr)
2720                                 sym->regType = REG_PTR;
2721                         else
2722                                 sym->regType = REG_GPR;
2723
2724
2725                         debugLog ("  reg name %s,  reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2726
2727                 }
2728                 else
2729                         /* for the first run we don't provide */
2730                         /* registers for true symbols we will */
2731                         /* see how things go                  */
2732                         sym->nRegs = 0;
2733   }
2734
2735 }
2736 DEFSETFUNC (markRegFree)
2737 {
2738         ((regs *)item)->isFree = 1;
2739
2740         return 0;
2741 }
2742
2743 DEFSETFUNC (deallocReg)
2744 {
2745         fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2746         ((regs *)item)->isFree = 1;
2747         ((regs *)item)->wasUsed = 0;
2748
2749         return 0;
2750 }
2751 /*-----------------------------------------------------------------*/
2752 /* freeAllRegs - mark all registers as free                        */
2753 /*-----------------------------------------------------------------*/
2754 void
2755 pic14_freeAllRegs ()
2756 {
2757         //  int i;
2758
2759         debugLog ("%s\n", __FUNCTION__);
2760
2761         applyToSet(dynAllocRegs,markRegFree);
2762         applyToSet(dynStackRegs,markRegFree);
2763
2764         /*
2765         for (i = 0; i < pic14_nRegs; i++)
2766         regspic14[i].isFree = 1;
2767         */
2768 }
2769
2770 /*-----------------------------------------------------------------*/
2771 /*-----------------------------------------------------------------*/
2772 void
2773 pic14_deallocateAllRegs ()
2774 {
2775         //  int i;
2776
2777         debugLog ("%s\n", __FUNCTION__);
2778
2779         applyToSet(dynAllocRegs,deallocReg);
2780
2781         /*
2782         for (i = 0; i < pic14_nRegs; i++) {
2783                 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2784                 regspic14[i].isFree = 1;
2785                 regspic14[i].wasUsed = 0;
2786                 }
2787         }
2788         */
2789 }
2790
2791
2792 /*-----------------------------------------------------------------*/
2793 /* deallocStackSpil - this will set the stack pointer back         */
2794 /*-----------------------------------------------------------------*/
2795 static
2796 DEFSETFUNC (deallocStackSpil)
2797 {
2798         symbol *sym = item;
2799
2800         debugLog ("%s\n", __FUNCTION__);
2801         deallocLocal (sym);
2802         return 0;
2803 }
2804
2805 /*-----------------------------------------------------------------*/
2806 /* farSpacePackable - returns the packable icode for far variables */
2807 /*-----------------------------------------------------------------*/
2808 static iCode *
2809 farSpacePackable (iCode * ic)
2810 {
2811         iCode *dic;
2812
2813         debugLog ("%s\n", __FUNCTION__);
2814         /* go thru till we find a definition for the
2815         symbol on the right */
2816         for (dic = ic->prev; dic; dic = dic->prev)
2817         {
2818
2819                 /* if the definition is a call then no */
2820                 if ((dic->op == CALL || dic->op == PCALL) &&
2821                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2822                 {
2823                         return NULL;
2824                 }
2825
2826                 /* if shift by unknown amount then not */
2827                 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2828                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2829                         return NULL;
2830
2831                 /* if pointer get and size > 1 */
2832                 if (POINTER_GET (dic) &&
2833                         getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2834                         return NULL;
2835
2836                 if (POINTER_SET (dic) &&
2837                         getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2838                         return NULL;
2839
2840                 /* if any three is a true symbol in far space */
2841                 if (IC_RESULT (dic) &&
2842                         IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2843                         isOperandInFarSpace (IC_RESULT (dic)))
2844                         return NULL;
2845
2846                 if (IC_RIGHT (dic) &&
2847                         IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2848                         isOperandInFarSpace (IC_RIGHT (dic)) &&
2849                         !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2850                         return NULL;
2851
2852                 if (IC_LEFT (dic) &&
2853                         IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2854                         isOperandInFarSpace (IC_LEFT (dic)) &&
2855                         !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2856                         return NULL;
2857
2858                 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2859                 {
2860                         if ((dic->op == LEFT_OP ||
2861                                 dic->op == RIGHT_OP ||
2862                                 dic->op == '-') &&
2863                                 IS_OP_LITERAL (IC_RIGHT (dic)))
2864                                 return NULL;
2865                         else
2866                                 return dic;
2867                 }
2868         }
2869
2870         return NULL;
2871 }
2872
2873 /*-----------------------------------------------------------------*/
2874 /* packRegsForAssign - register reduction for assignment           */
2875 /*-----------------------------------------------------------------*/
2876 static int
2877 packRegsForAssign (iCode * ic, eBBlock * ebp)
2878 {
2879
2880         iCode *dic, *sic;
2881
2882         debugLog ("%s\n", __FUNCTION__);
2883
2884         debugAopGet ("  result:", IC_RESULT (ic));
2885         debugAopGet ("  left:", IC_LEFT (ic));
2886         debugAopGet ("  right:", IC_RIGHT (ic));
2887
2888         /* if this is at an absolute address, then get the address. */
2889         if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2890                 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2891                         debugLog ("  %d - found config word declaration\n", __LINE__);
2892                         if(IS_VALOP(IC_RIGHT(ic))) {
2893                                 debugLog ("  setting config word to %x\n",
2894                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2895                                 assignConfigWordValue(  SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2896                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2897                         }
2898
2899                         /* remove the assignment from the iCode chain. */
2900
2901                         remiCodeFromeBBlock (ebp, ic);
2902                         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2903                         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2904
2905                         return 1;
2906
2907                 }
2908         }
2909
2910         if (!IS_ITEMP (IC_RESULT (ic))) {
2911                 allocDirReg(IC_RESULT (ic));
2912                 debugLog ("  %d - result is not temp\n", __LINE__);
2913         }
2914         /*
2915         if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2916         debugLog ("  %d - left is not temp, allocating\n", __LINE__);
2917         allocDirReg(IC_LEFT (ic));
2918         }
2919         */
2920
2921         if (!IS_ITEMP (IC_RIGHT (ic))) {
2922                 debugLog ("  %d - not packing - right is not temp\n", __LINE__);
2923
2924                 /* only pack if this is not a function pointer */
2925                 if (!IS_REF (IC_RIGHT (ic)))
2926                         allocDirReg(IC_RIGHT (ic));
2927                 return 0;
2928         }
2929
2930         if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2931                 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2932         {
2933                 debugLog ("  %d - not packing - right side fails \n", __LINE__);
2934                 return 0;
2935         }
2936
2937         /* if the true symbol is defined in far space or on stack
2938         then we should not since this will increase register pressure */
2939         if (isOperandInFarSpace (IC_RESULT (ic)))
2940         {
2941                 if ((dic = farSpacePackable (ic)))
2942                         goto pack;
2943                 else
2944                         return 0;
2945
2946         }
2947         /* find the definition of iTempNN scanning backwards if we find a
2948         a use of the true symbol before we find the definition then
2949         we cannot pack */
2950         for (dic = ic->prev; dic; dic = dic->prev)
2951         {
2952
2953         /* if there is a function call and this is
2954                 a parameter & not my parameter then don't pack it */
2955                 if ((dic->op == CALL || dic->op == PCALL) &&
2956                         (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2957                         !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2958                 {
2959                         debugLog ("  %d - \n", __LINE__);
2960                         dic = NULL;
2961                         break;
2962                 }
2963
2964                 if (SKIP_IC2 (dic))
2965                         continue;
2966
2967                 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2968                         IS_OP_VOLATILE (IC_RESULT (dic)))
2969                 {
2970                         debugLog ("  %d - dic is VOLATILE \n", __LINE__);
2971                         dic = NULL;
2972                         break;
2973                 }
2974
2975                 if (IS_SYMOP (IC_RESULT (dic)) &&
2976                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2977                 {
2978                         /* A previous result was assigned to the same register - we'll our definition */
2979                         debugLog ("  %d - dic result key == ic right key -- pointer set=%c\n",
2980                                 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
2981                         if (POINTER_SET (dic))
2982                                 dic = NULL;
2983
2984                         break;
2985                 }
2986
2987                 if (IS_SYMOP (IC_RIGHT (dic)) &&
2988                         (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
2989                         IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2990                 {
2991                         debugLog ("  %d - dic right key == ic rightor result key\n", __LINE__);
2992                         dic = NULL;
2993                         break;
2994                 }
2995
2996                 if (IS_SYMOP (IC_LEFT (dic)) &&
2997                         (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2998                         IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2999                 {
3000                         debugLog ("  %d - dic left key == ic rightor result key\n", __LINE__);
3001                         dic = NULL;
3002                         break;
3003                 }
3004
3005                 if (POINTER_SET (dic) &&
3006                         IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3007                 {
3008                         debugLog ("  %d - dic result key == ic result key -- pointer set=Y\n",
3009                                 __LINE__);
3010                         dic = NULL;
3011                         break;
3012                 }
3013         }
3014
3015         if (!dic)
3016                 return 0;                       /* did not find */
3017
3018                                                         /* if the result is on stack or iaccess then it must be
3019         the same atleast one of the operands */
3020         if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3021                 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3022         {
3023
3024         /* the operation has only one symbol
3025                 operator then we can pack */
3026                 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3027                         (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3028                         goto pack;
3029
3030                 if (!((IC_LEFT (dic) &&
3031                         IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3032                         (IC_RIGHT (dic) &&
3033                         IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3034                         return 0;
3035         }
3036 pack:
3037         debugLog ("  packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3038         debugLog ("  replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3039         /* found the definition */
3040         /* replace the result with the result of */
3041         /* this assignment and remove this assignment */
3042         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3043         IC_RESULT (dic) = IC_RESULT (ic);
3044
3045         if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3046         {
3047                 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3048         }
3049         /* delete from liverange table also
3050         delete from all the points inbetween and the new
3051         one */
3052         for (sic = dic; sic != ic; sic = sic->next)
3053         {
3054                 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3055                 if (IS_ITEMP (IC_RESULT (dic)))
3056                         bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3057         }
3058
3059         remiCodeFromeBBlock (ebp, ic);
3060         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3061         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3062         OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3063         return 1;
3064
3065
3066 }
3067
3068 /*-----------------------------------------------------------------*/
3069 /* findAssignToSym : scanning backwards looks for first assig found */
3070 /*-----------------------------------------------------------------*/
3071 static iCode *
3072 findAssignToSym (operand * op, iCode * ic)
3073 {
3074         iCode *dic;
3075
3076         debugLog ("%s\n", __FUNCTION__);
3077         for (dic = ic->prev; dic; dic = dic->prev)
3078         {
3079
3080                 /* if definition by assignment */
3081                 if (dic->op == '=' &&
3082                         !POINTER_SET (dic) &&
3083                         IC_RESULT (dic)->key == op->key
3084                         /*          &&  IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3085                         )
3086                 {
3087
3088                         /* we are interested only if defined in far space */
3089                         /* or in stack space in case of + & - */
3090
3091                         /* if assigned to a non-symbol then return
3092                         true */
3093                         if (!IS_SYMOP (IC_RIGHT (dic)))
3094                                 break;
3095
3096                                 /* if the symbol is in far space then
3097                         we should not */
3098                         if (isOperandInFarSpace (IC_RIGHT (dic)))
3099                                 return NULL;
3100
3101                                 /* for + & - operations make sure that
3102                                 if it is on the stack it is the same
3103                         as one of the three operands */
3104                         if ((ic->op == '+' || ic->op == '-') &&
3105                                 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3106                         {
3107
3108                                 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3109                                         IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3110                                         IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3111                                         return NULL;
3112                         }
3113
3114                         break;
3115
3116                 }
3117
3118                 /* if we find an usage then we cannot delete it */
3119                 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3120                         return NULL;
3121
3122                 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3123                         return NULL;
3124
3125                 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3126                         return NULL;
3127         }
3128
3129         /* now make sure that the right side of dic
3130         is not defined between ic & dic */
3131         if (dic)
3132         {
3133                 iCode *sic = dic->next;
3134
3135                 for (; sic != ic; sic = sic->next)
3136                         if (IC_RESULT (sic) &&
3137                                 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3138                                 return NULL;
3139         }
3140
3141         return dic;
3142
3143
3144 }
3145
3146 /*-----------------------------------------------------------------*/
3147 /* packRegsForSupport :- reduce some registers for support calls   */
3148 /*-----------------------------------------------------------------*/
3149 static int
3150 packRegsForSupport (iCode * ic, eBBlock * ebp)
3151 {
3152         int change = 0;
3153
3154         debugLog ("%s\n", __FUNCTION__);
3155         /* for the left & right operand :- look to see if the
3156         left was assigned a true symbol in far space in that
3157         case replace them */
3158         if (IS_ITEMP (IC_LEFT (ic)) &&
3159                 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3160         {
3161                 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3162                 iCode *sic;
3163
3164                 if (!dic)
3165                         goto right;
3166
3167                 debugAopGet ("removing left:", IC_LEFT (ic));
3168
3169                 /* found it we need to remove it from the
3170                 block */
3171                 for (sic = dic; sic != ic; sic = sic->next)
3172                         bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3173
3174                 IC_LEFT (ic)->operand.symOperand =
3175                         IC_RIGHT (dic)->operand.symOperand;
3176                 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3177                 remiCodeFromeBBlock (ebp, dic);
3178                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3179                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3180                 change++;
3181         }
3182
3183         /* do the same for the right operand */
3184 right:
3185         if (!change &&
3186                 IS_ITEMP (IC_RIGHT (ic)) &&
3187                 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3188         {
3189                 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3190                 iCode *sic;
3191
3192                 if (!dic)
3193                         return change;
3194
3195                         /* if this is a subtraction & the result
3196                 is a true symbol in far space then don't pack */
3197                 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3198                 {
3199                         sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3200                         if (IN_FARSPACE (SPEC_OCLS (etype)))
3201                                 return change;
3202                 }
3203
3204                 debugAopGet ("removing right:", IC_RIGHT (ic));
3205
3206                 /* found it we need to remove it from the
3207                 block */
3208                 for (sic = dic; sic != ic; sic = sic->next)
3209                         bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3210
3211                 IC_RIGHT (ic)->operand.symOperand =
3212                         IC_RIGHT (dic)->operand.symOperand;
3213                 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3214
3215                 remiCodeFromeBBlock (ebp, dic);
3216                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3217                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3218                 change++;
3219         }
3220
3221         return change;
3222 }
3223
3224 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3225
3226
3227 /*-----------------------------------------------------------------*/
3228 /* packRegsForOneuse : - will reduce some registers for single Use */
3229 /*-----------------------------------------------------------------*/
3230 static iCode *
3231 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3232 {
3233         bitVect *uses;
3234         iCode *dic, *sic;
3235
3236         debugLog ("%s\n", __FUNCTION__);
3237         /* if returning a literal then do nothing */
3238         if (!IS_SYMOP (op))
3239                 return NULL;
3240
3241                 /* only upto 2 bytes since we cannot predict
3242         the usage of b, & acc */
3243         if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3244                 ic->op != RETURN &&
3245                 ic->op != SEND)
3246                 return NULL;
3247
3248                 /* this routine will mark the a symbol as used in one
3249                 instruction use only && if the definition is local
3250                 (ie. within the basic block) && has only one definition &&
3251                 that definition is either a return value from a
3252                 function or does not contain any variables in
3253         far space */
3254         uses = bitVectCopy (OP_USES (op));
3255         bitVectUnSetBit (uses, ic->key);        /* take away this iCode */
3256         if (!bitVectIsZero (uses))      /* has other uses */
3257                 return NULL;
3258
3259         /* if it has only one defintion */
3260         if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3261                 return NULL;            /* has more than one definition */
3262
3263         /* get that definition */
3264         if (!(dic =
3265                 hTabItemWithKey (iCodehTab,
3266                 bitVectFirstBit (OP_DEFS (op)))))
3267                 return NULL;
3268
3269         /* found the definition now check if it is local */
3270         if (dic->seq < ebp->fSeq ||
3271                 dic->seq > ebp->lSeq)
3272                 return NULL;            /* non-local */
3273
3274                                                         /* now check if it is the return from
3275         a function call */
3276         if (dic->op == CALL || dic->op == PCALL)
3277         {
3278                 if (ic->op != SEND && ic->op != RETURN &&
3279                         !POINTER_SET(ic) && !POINTER_GET(ic))
3280                 {
3281                         OP_SYMBOL (op)->ruonly = 1;
3282                         return dic;
3283                 }
3284                 dic = dic->next;
3285         }
3286
3287
3288         /* otherwise check that the definition does
3289         not contain any symbols in far space */
3290         if (isOperandInFarSpace (IC_LEFT (dic)) ||
3291                 isOperandInFarSpace (IC_RIGHT (dic)) ||
3292                 IS_OP_RUONLY (IC_LEFT (ic)) ||
3293                 IS_OP_RUONLY (IC_RIGHT (ic)))
3294         {
3295                 return NULL;
3296         }
3297
3298         /* if pointer set then make sure the pointer
3299         is one byte */
3300         if (POINTER_SET (dic) &&
3301                 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3302                 return NULL;
3303
3304         if (POINTER_GET (dic) &&
3305                 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3306                 return NULL;
3307
3308         sic = dic;
3309
3310         /* also make sure the intervenening instructions
3311         don't have any thing in far space */
3312         for (dic = dic->next; dic && dic != ic; dic = dic->next)
3313         {
3314
3315                 /* if there is an intervening function call then no */
3316                 if (dic->op == CALL || dic->op == PCALL)
3317                         return NULL;
3318                         /* if pointer set then make sure the pointer
3319                 is one byte */
3320                 if (POINTER_SET (dic) &&
3321                         !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3322                         return NULL;
3323
3324                 if (POINTER_GET (dic) &&
3325                         !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3326                         return NULL;
3327
3328                 /* if address of & the result is remat then okay */
3329                 if (dic->op == ADDRESS_OF &&
3330                         OP_SYMBOL (IC_RESULT (dic))->remat)
3331                         continue;
3332
3333                         /* if operand has size of three or more & this
3334                         operation is a '*','/' or '%' then 'b' may
3335                 cause a problem */
3336                 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3337                         getSize (operandType (op)) >= 3)
3338                         return NULL;
3339
3340                 /* if left or right or result is in far space */
3341                 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3342                         isOperandInFarSpace (IC_RIGHT (dic)) ||
3343                         isOperandInFarSpace (IC_RESULT (dic)) ||
3344                         IS_OP_RUONLY (IC_LEFT (dic)) ||
3345                         IS_OP_RUONLY (IC_RIGHT (dic)) ||
3346                         IS_OP_RUONLY (IC_RESULT (dic)))
3347                 {
3348                         return NULL;
3349                 }
3350         }
3351
3352         OP_SYMBOL (op)->ruonly = 1;
3353         return sic;
3354
3355 }
3356
3357 /*-----------------------------------------------------------------*/
3358 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN          */
3359 /*-----------------------------------------------------------------*/
3360 static bool
3361 isBitwiseOptimizable (iCode * ic)
3362 {
3363         sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3364         sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3365
3366         debugLog ("%s\n", __FUNCTION__);
3367         /* bitwise operations are considered optimizable
3368         under the following conditions (Jean-Louis VERN)
3369
3370           x & lit
3371           bit & bit
3372           bit & x
3373           bit ^ bit
3374           bit ^ x
3375           x   ^ lit
3376           x   | lit
3377           bit | bit
3378           bit | x
3379         */
3380         if (IS_LITERAL (rtype) ||
3381                 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3382                 return TRUE;
3383         else
3384                 return FALSE;
3385 }
3386
3387 /*-----------------------------------------------------------------*/
3388 /* packRegsForAccUse - pack registers for acc use                  */
3389 /*-----------------------------------------------------------------*/
3390 static void
3391 packRegsForAccUse (iCode * ic)
3392 {
3393         iCode *uic;
3394
3395         debugLog ("%s\n", __FUNCTION__);
3396
3397         /* if this is an aggregate, e.g. a one byte char array */
3398         if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3399                 return;
3400         }
3401         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3402
3403         /* if + or - then it has to be one byte result */
3404         if ((ic->op == '+' || ic->op == '-')
3405                 && getSize (operandType (IC_RESULT (ic))) > 1)
3406                 return;
3407
3408         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3409         /* if shift operation make sure right side is not a literal */
3410         if (ic->op == RIGHT_OP &&
3411                 (isOperandLiteral (IC_RIGHT (ic)) ||
3412                 getSize (operandType (IC_RESULT (ic))) > 1))
3413                 return;
3414
3415         if (ic->op == LEFT_OP &&
3416                 (isOperandLiteral (IC_RIGHT (ic)) ||
3417                 getSize (operandType (IC_RESULT (ic))) > 1))
3418                 return;
3419
3420         if (IS_BITWISE_OP (ic) &&
3421                 getSize (operandType (IC_RESULT (ic))) > 1)
3422                 return;
3423
3424
3425         /* has only one definition */
3426         if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3427                 return;
3428
3429         /* has only one use */
3430         if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3431                 return;
3432
3433         /* and the usage immediately follows this iCode */
3434         if (!(uic = hTabItemWithKey (iCodehTab,
3435                 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3436                 return;
3437
3438         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3439         if (ic->next != uic)
3440                 return;
3441
3442         /* if it is a conditional branch then we definitely can */
3443         if (uic->op == IFX)
3444                 goto accuse;
3445
3446         if (uic->op == JUMPTABLE)
3447                 return;
3448
3449                 /* if the usage is not is an assignment
3450         or an arithmetic / bitwise / shift operation then not */
3451         if (POINTER_SET (uic) &&
3452                 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3453                 return;
3454
3455         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3456         if (uic->op != '=' &&
3457                 !IS_ARITHMETIC_OP (uic) &&
3458                 !IS_BITWISE_OP (uic) &&
3459                 uic->op != LEFT_OP &&
3460                 uic->op != RIGHT_OP)
3461                 return;
3462
3463         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3464         /* if used in ^ operation then make sure right is not a
3465         literl */
3466         if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3467                 return;
3468
3469         /* if shift operation make sure right side is not a literal */
3470         if (uic->op == RIGHT_OP &&
3471                 (isOperandLiteral (IC_RIGHT (uic)) ||
3472                 getSize (operandType (IC_RESULT (uic))) > 1))
3473                 return;
3474
3475         if (uic->op == LEFT_OP &&
3476                 (isOperandLiteral (IC_RIGHT (uic)) ||
3477                 getSize (operandType (IC_RESULT (uic))) > 1))
3478                 return;
3479
3480                 /* make sure that the result of this icode is not on the
3481         stack, since acc is used to compute stack offset */
3482         if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3483                 OP_SYMBOL (IC_RESULT (uic))->onStack)
3484                 return;
3485
3486         /* if either one of them in far space then we cannot */
3487         if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3488                 isOperandInFarSpace (IC_LEFT (uic))) ||
3489                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3490                 isOperandInFarSpace (IC_RIGHT (uic))))
3491                 return;
3492
3493         /* if the usage has only one operand then we can */
3494         if (IC_LEFT (uic) == NULL ||
3495                 IC_RIGHT (uic) == NULL)
3496                 goto accuse;
3497
3498                 /* make sure this is on the left side if not
3499         a '+' since '+' is commutative */
3500         if (ic->op != '+' &&
3501                 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3502                 return;
3503
3504         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3505         /* if one of them is a literal then we can */
3506         if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3507                 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic))))  &&
3508                 (getSize (operandType (IC_RESULT (uic))) <= 1))
3509         {
3510                 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3511                 return;
3512         }
3513
3514         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3515         /* if the other one is not on stack then we can */
3516         if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3517                 (IS_ITEMP (IC_RIGHT (uic)) ||
3518                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3519                 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3520                 goto accuse;
3521
3522         if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3523                 (IS_ITEMP (IC_LEFT (uic)) ||
3524                 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3525                 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3526                 goto accuse;
3527
3528         return;
3529
3530 accuse:
3531         debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3532         OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3533
3534
3535 }
3536
3537 /*-----------------------------------------------------------------*/
3538 /* packForPush - hueristics to reduce iCode for pushing            */
3539 /*-----------------------------------------------------------------*/
3540 static void
3541 packForReceive (iCode * ic, eBBlock * ebp)
3542 {
3543         iCode *dic;
3544
3545         debugLog ("%s\n", __FUNCTION__);
3546         debugAopGet ("  result:", IC_RESULT (ic));
3547         debugAopGet ("  left:", IC_LEFT (ic));
3548         debugAopGet ("  right:", IC_RIGHT (ic));
3549
3550         if (!ic->next)
3551                 return;
3552
3553         for (dic = ic->next; dic; dic = dic->next)
3554         {
3555
3556
3557
3558                 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3559                         debugLog ("    used on left\n");
3560                 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3561                         debugLog ("    used on right\n");
3562                 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3563                         debugLog ("    used on result\n");
3564
3565                 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3566                         (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3567                         return;
3568
3569         }
3570
3571         debugLog ("  hey we can remove this unnecessary assign\n");
3572 }
3573 /*-----------------------------------------------------------------*/
3574 /* packForPush - hueristics to reduce iCode for pushing            */
3575 /*-----------------------------------------------------------------*/
3576 static void
3577 packForPush (iCode * ic, eBBlock * ebp)
3578 {
3579         iCode *dic;
3580
3581         debugLog ("%s\n", __FUNCTION__);
3582         if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3583                 return;
3584
3585         /* must have only definition & one usage */
3586         if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3587                 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3588                 return;
3589
3590         /* find the definition */
3591         if (!(dic = hTabItemWithKey (iCodehTab,
3592                 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3593                 return;
3594
3595         if (dic->op != '=' || POINTER_SET (dic))
3596                 return;
3597
3598                 /* we now we know that it has one & only one def & use
3599         and the that the definition is an assignment */
3600         IC_LEFT (ic) = IC_RIGHT (dic);
3601
3602         remiCodeFromeBBlock (ebp, dic);
3603         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3604         hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3605 }
3606
3607 void printSymType(char * str, sym_link *sl)
3608 {
3609         debugLog ("    %s Symbol type: ",str);
3610         printTypeChain( sl, debugF);
3611         debugLog ("\n");
3612
3613 }
3614
3615 /*-----------------------------------------------------------------*/
3616 /* some debug code to print the symbol S_TYPE. Note that
3617 * the function checkSClass in src/SDCCsymt.c dinks with
3618 * the S_TYPE in ways the PIC port doesn't fully like...*/
3619 /*-----------------------------------------------------------------*/
3620 void isData(sym_link *sl)
3621 {
3622         FILE *of = stderr;
3623
3624         if(!sl)
3625                 return;
3626
3627         if(debugF)
3628                 of = debugF;
3629
3630         for ( ; sl; sl=sl->next) {
3631                 if(!IS_DECL(sl) ) {
3632                         switch (SPEC_SCLS(sl)) {
3633
3634                         case S_DATA: fprintf (of, "data "); break;
3635                         case S_XDATA: fprintf (of, "xdata "); break;
3636                         case S_SFR: fprintf (of, "sfr "); break;
3637                         case S_SBIT: fprintf (of, "sbit "); break;
3638                         case S_CODE: fprintf (of, "code "); break;
3639                         case S_IDATA: fprintf (of, "idata "); break;
3640                         case S_PDATA: fprintf (of, "pdata "); break;
3641                         case S_LITERAL: fprintf (of, "literal "); break;
3642                         case S_STACK: fprintf (of, "stack "); break;
3643                         case S_XSTACK: fprintf (of, "xstack "); break;
3644                         case S_BIT: fprintf (of, "bit "); break;
3645                         case S_EEPROM: fprintf (of, "eeprom "); break;
3646                         default: break;
3647                         }
3648
3649                 }
3650
3651         }
3652
3653 }
3654 /*-----------------------------------------------------------------*/
3655 /* packRegisters - does some transformations to reduce register    */
3656 /*                   pressure                                      */
3657 /*-----------------------------------------------------------------*/
3658 static void
3659 packRegisters (eBBlock * ebp)
3660 {
3661         iCode *ic;
3662         int change = 0;
3663
3664         debugLog ("%s\n", __FUNCTION__);
3665
3666         while (1) {
3667
3668                 change = 0;
3669
3670                 /* look for assignments of the form */
3671                 /* iTempNN = TRueSym (someoperation) SomeOperand */
3672                 /*       ....                       */
3673                 /* TrueSym := iTempNN:1             */
3674                 for (ic = ebp->sch; ic; ic = ic->next)
3675                 {
3676
3677                         /* find assignment of the form TrueSym := iTempNN:1 */
3678                         if (ic->op == '=' && !POINTER_SET (ic))
3679                                 change += packRegsForAssign (ic, ebp);
3680                         /* debug stuff */
3681                         if (ic->op == '=')
3682                         {
3683                                 if (POINTER_SET (ic))
3684                                         debugLog ("pointer is set\n");
3685                                 debugAopGet ("  result:", IC_RESULT (ic));
3686                                 debugAopGet ("  left:", IC_LEFT (ic));
3687                                 debugAopGet ("  right:", IC_RIGHT (ic));
3688                         }
3689
3690                 }
3691
3692                 if (!change)
3693                         break;
3694         }
3695
3696         for (ic = ebp->sch; ic; ic = ic->next) {
3697
3698                 if(IS_SYMOP ( IC_LEFT(ic))) {
3699                         sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3700
3701                         debugAopGet ("  left:", IC_LEFT (ic));
3702                         if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3703                                 debugLog ("    is a pointer\n");
3704
3705                         if(IS_OP_VOLATILE(IC_LEFT(ic)))
3706                                 debugLog ("    is volatile\n");
3707
3708                         isData(etype);
3709
3710                         printSymType("   ", OP_SYMBOL(IC_LEFT(ic))->type);
3711                 }
3712
3713                 if(IS_SYMOP ( IC_RIGHT(ic))) {
3714                         debugAopGet ("  right:", IC_RIGHT (ic));
3715                         printSymType("    ", OP_SYMBOL(IC_RIGHT(ic))->type);
3716                 }
3717
3718                 if(IS_SYMOP ( IC_RESULT(ic))) {
3719                         debugAopGet ("  result:", IC_RESULT (ic));
3720                         printSymType("     ", OP_SYMBOL(IC_RESULT(ic))->type);
3721                 }
3722
3723                 if (POINTER_SET (ic))
3724                         debugLog ("  %d - Pointer set\n", __LINE__);
3725
3726
3727                         /* if this is an itemp & result of a address of a true sym
3728                 then mark this as rematerialisable   */
3729                 if (ic->op == ADDRESS_OF &&
3730                         IS_ITEMP (IC_RESULT (ic)) &&
3731                         IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3732                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3733                         !OP_SYMBOL (IC_LEFT (ic))->onStack)
3734                 {
3735
3736                         debugLog ("  %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3737
3738                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3739                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3740                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3741
3742                 }
3743
3744                 /* if straight assignment then carry remat flag if
3745                 this is the only definition */
3746                 if (ic->op == '=' &&
3747                         !POINTER_SET (ic) &&
3748                         IS_SYMOP (IC_RIGHT (ic)) &&
3749                         OP_SYMBOL (IC_RIGHT (ic))->remat &&
3750                         bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3751                 {
3752                         debugLog ("  %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3753
3754                         OP_SYMBOL (IC_RESULT (ic))->remat =
3755                                 OP_SYMBOL (IC_RIGHT (ic))->remat;
3756                         OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3757                                 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3758                 }
3759
3760                 /* if this is a +/- operation with a rematerizable
3761                 then mark this as rematerializable as well */
3762                 if ((ic->op == '+' || ic->op == '-') &&
3763                         (IS_SYMOP (IC_LEFT (ic)) &&
3764                         IS_ITEMP (IC_RESULT (ic)) &&
3765                         OP_SYMBOL (IC_LEFT (ic))->remat &&
3766                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3767                         IS_OP_LITERAL (IC_RIGHT (ic))))
3768                 {
3769                         debugLog ("  %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3770                         //int i =
3771                         operandLitValue (IC_RIGHT (ic));
3772                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3773                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3774                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3775                 }
3776
3777                 /* mark the pointer usages */
3778                 if (POINTER_SET (ic))
3779                 {
3780                         OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3781                         debugLog ("  marking as a pointer (set) =>");
3782                         debugAopGet ("  result:", IC_RESULT (ic));
3783                 }
3784                 if (POINTER_GET (ic))
3785                 {
3786                         OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3787                         debugLog ("  marking as a pointer (get) =>");
3788                         debugAopGet ("  left:", IC_LEFT (ic));
3789                 }
3790
3791                 if (!SKIP_IC2 (ic))
3792                 {
3793                 /* if we are using a symbol on the stack
3794                         then we should say pic14_ptrRegReq */
3795                         if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3796                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3797                                 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3798                         else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3799                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3800                                 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3801                         else
3802                         {
3803                                 if (IS_SYMOP (IC_LEFT (ic)))
3804                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3805                                         OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3806                                 if (IS_SYMOP (IC_RIGHT (ic)))
3807                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3808                                         OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3809                                 if (IS_SYMOP (IC_RESULT (ic)))
3810                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3811                                         OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3812                         }
3813
3814                         debugLog ("  %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3815
3816                 }
3817
3818                 /* if the condition of an if instruction
3819                 is defined in the previous instruction then
3820                 mark the itemp as a conditional */
3821                 if ((IS_CONDITIONAL (ic) ||
3822                         ((ic->op == BITWISEAND ||
3823                         ic->op == '|' ||
3824                         ic->op == '^') &&
3825                         isBitwiseOptimizable (ic))) &&
3826                         ic->next && ic->next->op == IFX &&
3827                         isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3828                         OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3829                 {
3830
3831                         debugLog ("  %d\n", __LINE__);
3832                         OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3833                         continue;
3834                 }
3835
3836                 /* reduce for support function calls */
3837                 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3838                         packRegsForSupport (ic, ebp);
3839
3840                 /* if a parameter is passed, it's in W, so we may not
3841                 need to place a copy in a register */
3842                 if (ic->op == RECEIVE)
3843                         packForReceive (ic, ebp);
3844
3845                 /* some cases the redundant moves can
3846                 can be eliminated for return statements */
3847                 if ((ic->op == RETURN || ic->op == SEND) &&
3848                         !isOperandInFarSpace (IC_LEFT (ic)) &&
3849                         !options.model)
3850                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3851
3852                 /* if pointer set & left has a size more than
3853                 one and right is not in far space */
3854                 if (POINTER_SET (ic) &&
3855                         !isOperandInFarSpace (IC_RIGHT (ic)) &&
3856                         !OP_SYMBOL (IC_RESULT (ic))->remat &&
3857                         !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3858                         getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3859
3860                         packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3861
3862                 /* if pointer get */
3863                 if (POINTER_GET (ic) &&
3864                         !isOperandInFarSpace (IC_RESULT (ic)) &&
3865                         !OP_SYMBOL (IC_LEFT (ic))->remat &&
3866                         !IS_OP_RUONLY (IC_RESULT (ic)) &&
3867                         getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3868
3869                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3870
3871
3872                         /* if this is cast for intergral promotion then
3873                         check if only use of  the definition of the
3874                         operand being casted/ if yes then replace
3875                         the result of that arithmetic operation with
3876                 this result and get rid of the cast */
3877                 if (ic->op == CAST) {
3878
3879                         sym_link *fromType = operandType (IC_RIGHT (ic));
3880                         sym_link *toType = operandType (IC_LEFT (ic));
3881
3882                         debugLog ("  %d - casting\n", __LINE__);
3883
3884                         if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3885                                 getSize (fromType) != getSize (toType)) {
3886
3887
3888                                 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3889                                 if (dic) {
3890
3891                                         if (IS_ARITHMETIC_OP (dic)) {
3892
3893                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3894                                                 IC_RESULT (dic) = IC_RESULT (ic);
3895                                                 remiCodeFromeBBlock (ebp, ic);
3896                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3897                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3898                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3899                                                 ic = ic->prev;
3900                                         }  else
3901
3902                                                 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3903                                 }
3904                         } else {
3905
3906                         /* if the type from and type to are the same
3907                                 then if this is the only use then packit */
3908                                 if (compareType (operandType (IC_RIGHT (ic)),
3909                                         operandType (IC_LEFT (ic))) == 1) {
3910
3911                                         iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3912                                         if (dic) {
3913
3914                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3915                                                 IC_RESULT (dic) = IC_RESULT (ic);
3916                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3917                                                 remiCodeFromeBBlock (ebp, ic);
3918                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3919                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3920                                                 ic = ic->prev;
3921                                         }
3922                                 }
3923                         }
3924                 }
3925
3926                 /* pack for PUSH
3927                 iTempNN := (some variable in farspace) V1
3928                 push iTempNN ;
3929                 -------------
3930                 push V1
3931                 */
3932                 if (ic->op == IPUSH)
3933                 {
3934                         packForPush (ic, ebp);
3935                 }
3936
3937
3938                 /* pack registers for accumulator use, when the
3939                 result of an arithmetic or bit wise operation
3940                 has only one use, that use is immediately following
3941                 the defintion and the using iCode has only one
3942                 operand or has two operands but one is literal &
3943                 the result of that operation is not on stack then
3944                 we can leave the result of this operation in acc:b
3945                 combination */
3946                 if ((IS_ARITHMETIC_OP (ic)
3947
3948                         || IS_BITWISE_OP (ic)
3949
3950                         || ic->op == LEFT_OP || ic->op == RIGHT_OP
3951
3952                         ) &&
3953                         IS_ITEMP (IC_RESULT (ic)) &&
3954                         getSize (operandType (IC_RESULT (ic))) <= 2)
3955
3956                         packRegsForAccUse (ic);
3957
3958   }
3959 }
3960
3961 static void
3962 dumpEbbsToDebug (eBBlock ** ebbs, int count)
3963 {
3964         int i;
3965
3966         if (!debug || !debugF)
3967                 return;
3968
3969         for (i = 0; i < count; i++)
3970         {
3971                 fprintf (debugF, "\n----------------------------------------------------------------\n");
3972                 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
3973                         ebbs[i]->entryLabel->name,
3974                         ebbs[i]->depth,
3975                         ebbs[i]->noPath,
3976                         ebbs[i]->isLastInLoop);
3977                 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
3978                         ebbs[i]->dfnum,
3979                         ebbs[i]->bbnum,
3980                         ebbs[i]->fSeq,
3981                         ebbs[i]->lSeq);
3982                 fprintf (debugF, "visited %d : hasFcall = %d\n",
3983                         ebbs[i]->visited,
3984                         ebbs[i]->hasFcall);
3985
3986                 fprintf (debugF, "\ndefines bitVector :");
3987                 bitVectDebugOn (ebbs[i]->defSet, debugF);
3988                 fprintf (debugF, "\nlocal defines bitVector :");
3989                 bitVectDebugOn (ebbs[i]->ldefs, debugF);
3990                 fprintf (debugF, "\npointers Set bitvector :");
3991                 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
3992                 fprintf (debugF, "\nin pointers Set bitvector :");
3993                 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
3994                 fprintf (debugF, "\ninDefs Set bitvector :");
3995                 bitVectDebugOn (ebbs[i]->inDefs, debugF);
3996                 fprintf (debugF, "\noutDefs Set bitvector :");
3997                 bitVectDebugOn (ebbs[i]->outDefs, debugF);
3998                 fprintf (debugF, "\nusesDefs Set bitvector :");
3999                 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4000                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4001                 printiCChain (ebbs[i]->sch, debugF);
4002         }
4003 }
4004 /*-----------------------------------------------------------------*/
4005 /* assignRegisters - assigns registers to each live range as need  */
4006 /*-----------------------------------------------------------------*/
4007 void
4008 pic14_assignRegisters (eBBlock ** ebbs, int count)
4009 {
4010         iCode *ic;
4011         int i;
4012
4013         debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4014         debugLog ("\nebbs before optimizing:\n");
4015         dumpEbbsToDebug (ebbs, count);
4016
4017         setToNull ((void *) &_G.funcrUsed);
4018         pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4019
4020
4021         /* change assignments this will remove some
4022         live ranges reducing some register pressure */
4023         for (i = 0; i < count; i++)
4024                 packRegisters (ebbs[i]);
4025
4026         {
4027                 regs *reg;
4028                 int hkey;
4029                 int i=0;
4030
4031                 debugLog("dir registers allocated so far:\n");
4032                 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4033
4034                 while(reg) {
4035                         debugLog("  -- #%d reg = %s  key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4036                         reg = hTabNextItem(dynDirectRegNames, &hkey);
4037                 }
4038
4039         }
4040
4041         if (options.dump_pack)
4042                 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4043
4044                 /* first determine for each live range the number of
4045         registers & the type of registers required for each */
4046         regTypeNum ();
4047
4048         /* and serially allocate registers */
4049         serialRegAssign (ebbs, count);
4050
4051         /* if stack was extended then tell the user */
4052         if (_G.stackExtend)
4053         {
4054                 /*      werror(W_TOOMANY_SPILS,"stack", */
4055                 /*             _G.stackExtend,currFunc->name,""); */
4056                 _G.stackExtend = 0;
4057         }
4058
4059         if (_G.dataExtend)
4060         {
4061                 /*      werror(W_TOOMANY_SPILS,"data space", */
4062                 /*             _G.dataExtend,currFunc->name,""); */
4063                 _G.dataExtend = 0;
4064         }
4065
4066         /* after that create the register mask
4067         for each of the instruction */
4068         createRegMask (ebbs, count);
4069
4070         /* redo that offsets for stacked automatic variables */
4071         redoStackOffsets ();
4072
4073         if (options.dump_rassgn)
4074                 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4075
4076         /* now get back the chain */
4077         ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4078
4079         debugLog ("ebbs after optimizing:\n");
4080         dumpEbbsToDebug (ebbs, count);
4081
4082
4083         genpic14Code (ic);
4084
4085         /* free up any _G.stackSpil locations allocated */
4086         applyToSet (_G.stackSpil, deallocStackSpil);
4087         _G.slocNum = 0;
4088         setToNull ((void *) &_G.stackSpil);
4089         setToNull ((void *) &_G.spiltSet);
4090         /* mark all registers as free */
4091         //pic14_freeAllRegs ();
4092
4093         debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");
4094         debugLogClose ();
4095         return;
4096 }