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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 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2209 /* it should either have registers or have beed spilled. Otherwise, */
2210 /* there was an uninitialized variable, so just spill this to get   */
2211 /* the operand in a valid state.                                    */
2212 /*------------------------------------------------------------------*/
2213 static void
2214 verifyRegsAssigned (operand *op, iCode * ic)
2215 {
2216   symbol * sym;
2217
2218   if (!op) return;
2219   if (!IS_ITEMP (op)) return;
2220
2221   sym = OP_SYMBOL (op);
2222   if (sym->isspilt) return;
2223   if (!sym->nRegs) return;
2224   if (sym->regs[0]) return;
2225
2226   werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2227             sym->prereqv ? sym->prereqv->name : sym->name);
2228   spillThis (sym);
2229 }
2230
2231
2232 /*-----------------------------------------------------------------*/
2233 /* serialRegAssign - serially allocate registers to the variables  */
2234 /*-----------------------------------------------------------------*/
2235 static void
2236 serialRegAssign (eBBlock ** ebbs, int count)
2237 {
2238         int i;
2239
2240         debugLog ("%s\n", __FUNCTION__);
2241         /* for all blocks */
2242         for (i = 0; i < count; i++)
2243         {
2244
2245                 iCode *ic;
2246
2247                 if (ebbs[i]->noPath &&
2248                         (ebbs[i]->entryLabel != entryLabel &&
2249                         ebbs[i]->entryLabel != returnLabel))
2250                         continue;
2251
2252                 /* of all instructions do */
2253                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2254                 {
2255
2256                         debugLog ("  op: %s\n", decodeOp (ic->op));
2257
2258                         /* if this is an ipop that means some live
2259                         range will have to be assigned again */
2260                         if (ic->op == IPOP)
2261                                 reassignLR (IC_LEFT (ic));
2262
2263                         /* if result is present && is a true symbol */
2264                         if (IC_RESULT (ic) && ic->op != IFX &&
2265                                 IS_TRUE_SYMOP (IC_RESULT (ic)))
2266                                 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2267
2268                                 /* take away registers from live
2269                         ranges that end at this instruction */
2270                         deassignLRs (ic, ebbs[i]);
2271
2272                         /* some don't need registers */
2273                         if (SKIP_IC2 (ic) ||
2274                                 ic->op == JUMPTABLE ||
2275                                 ic->op == IFX ||
2276                                 ic->op == IPUSH ||
2277                                 ic->op == IPOP ||
2278                                 (IC_RESULT (ic) && POINTER_SET (ic)))
2279                                 continue;
2280
2281                                 /* now we need to allocate registers
2282                         only for the result */
2283                         if (IC_RESULT (ic))
2284                         {
2285                                 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2286                                 bitVect *spillable;
2287                                 int willCS;
2288                                 int j;
2289                                 int ptrRegSet = 0;
2290
2291                                 /* if it does not need or is spilt
2292                                 or is already assigned to registers
2293                                 or will not live beyond this instructions */
2294                                 if (!sym->nRegs ||
2295                                         sym->isspilt ||
2296                                         bitVectBitValue (_G.regAssigned, sym->key) ||
2297                                         sym->liveTo <= ic->seq)
2298                                         continue;
2299
2300                                         /* if some liverange has been spilt at the block level
2301                                         and this one live beyond this block then spil this
2302                                 to be safe */
2303                                 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2304                                 {
2305                                         spillThis (sym);
2306                                         continue;
2307                                 }
2308                                 /* if trying to allocate this will cause
2309                                 a spill and there is nothing to spill
2310                                 or this one is rematerializable then
2311                                 spill this one */
2312                                 willCS = willCauseSpill (sym->nRegs, sym->regType);
2313                                 spillable = computeSpillable (ic);
2314                                 if (sym->remat ||
2315                                         (willCS && bitVectIsZero (spillable)))
2316                                 {
2317
2318                                         spillThis (sym);
2319                                         continue;
2320
2321                                 }
2322
2323                                 /* if it has a spillocation & is used less than
2324                                 all other live ranges then spill this */
2325                                 if (willCS) {
2326                                         if (sym->usl.spillLoc) {
2327                                                 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2328                                                         allLRs, ebbs[i], ic));
2329                                                 if (leastUsed && leastUsed->used > sym->used) {
2330                                                         spillThis (sym);
2331                                                         continue;
2332                                                 }
2333                                         } else {
2334                                         /* if none of the liveRanges have a spillLocation then better
2335                                                 to spill this one than anything else already assigned to registers */
2336                                                 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2337                                                         /* if this is local to this block then we might find a block spil */
2338                                                         if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2339                                                                 spillThis (sym);
2340                                                                 continue;
2341                                                         }
2342                                                 }
2343                                         }
2344                                 }
2345
2346                                 if (ic->op == RECEIVE)
2347                                         debugLog ("When I get clever, I'll optimize the receive logic\n");
2348
2349                                         /* if we need ptr regs for the right side
2350                                 then mark it */
2351                                 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2352                                         <= (unsigned) PTRSIZE)
2353                                 {
2354                                         pic14_ptrRegReq++;
2355                                         ptrRegSet = 1;
2356                                 }
2357                                 /* else we assign registers to it */
2358                                 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2359
2360                                 debugLog ("  %d - \n", __LINE__);
2361                                 if(debugF)
2362                                         bitVectDebugOn(_G.regAssigned, debugF);
2363                                 for (j = 0; j < sym->nRegs; j++)
2364                                 {
2365                                         if (sym->regType == REG_PTR)
2366                                                 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2367                                         else
2368                                                 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2369
2370                                                 /* if the allocation failed which means
2371                                         this was spilt then break */
2372                                         if (!sym->regs[j])
2373                                                 break;
2374                                 }
2375                                 debugLog ("  %d - \n", __LINE__);
2376
2377                                 /* if it shares registers with operands make sure
2378                                 that they are in the same position */
2379                                 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2380                                         OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2381                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2382                                         OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2383                                 /* do the same for the right operand */
2384                                 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2385                                         OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2386                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2387                                         OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2388
2389                                 debugLog ("  %d - \n", __LINE__);
2390                                 if (ptrRegSet)
2391                                 {
2392                                         debugLog ("  %d - \n", __LINE__);
2393                                         pic14_ptrRegReq--;
2394                                         ptrRegSet = 0;
2395                                 }
2396
2397                 }
2398         }
2399         }
2400
2401     /* Check for and fix any problems with uninitialized operands */
2402     for (i = 0; i < count; i++)
2403       {
2404         iCode *ic;
2405
2406         if (ebbs[i]->noPath &&
2407             (ebbs[i]->entryLabel != entryLabel &&
2408              ebbs[i]->entryLabel != returnLabel))
2409             continue;
2410
2411         for (ic = ebbs[i]->sch; ic; ic = ic->next)
2412           {
2413             if (SKIP_IC2 (ic))
2414               continue;
2415
2416             if (ic->op == IFX)
2417               {
2418                 verifyRegsAssigned (IC_COND (ic), ic);
2419                 continue;
2420               }
2421
2422             if (ic->op == JUMPTABLE)
2423               {
2424                 verifyRegsAssigned (IC_JTCOND (ic), ic);
2425                 continue;
2426               }
2427
2428             verifyRegsAssigned (IC_RESULT (ic), ic);
2429             verifyRegsAssigned (IC_LEFT (ic), ic);
2430             verifyRegsAssigned (IC_RIGHT (ic), ic);
2431           }
2432       }
2433
2434 }
2435
2436 /*-----------------------------------------------------------------*/
2437 /* rUmaskForOp :- returns register mask for an operand             */
2438 /*-----------------------------------------------------------------*/
2439 static bitVect *
2440 rUmaskForOp (operand * op)
2441 {
2442         bitVect *rumask;
2443         symbol *sym;
2444         int j;
2445
2446         debugLog ("%s\n", __FUNCTION__);
2447         /* only temporaries are assigned registers */
2448         if (!IS_ITEMP (op))
2449                 return NULL;
2450
2451         sym = OP_SYMBOL (op);
2452
2453         /* if spilt or no registers assigned to it
2454         then nothing */
2455         if (sym->isspilt || !sym->nRegs)
2456                 return NULL;
2457
2458         rumask = newBitVect (pic14_nRegs);
2459
2460         for (j = 0; j < sym->nRegs; j++)
2461         {
2462                 rumask = bitVectSetBit (rumask,
2463                         sym->regs[j]->rIdx);
2464         }
2465
2466         return rumask;
2467 }
2468
2469 /*-----------------------------------------------------------------*/
2470 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2471 /*-----------------------------------------------------------------*/
2472 static bitVect *
2473 regsUsedIniCode (iCode * ic)
2474 {
2475         bitVect *rmask = newBitVect (pic14_nRegs);
2476
2477         debugLog ("%s\n", __FUNCTION__);
2478         /* do the special cases first */
2479         if (ic->op == IFX)
2480         {
2481                 rmask = bitVectUnion (rmask,
2482                         rUmaskForOp (IC_COND (ic)));
2483                 goto ret;
2484         }
2485
2486         /* for the jumptable */
2487         if (ic->op == JUMPTABLE)
2488         {
2489                 rmask = bitVectUnion (rmask,
2490                         rUmaskForOp (IC_JTCOND (ic)));
2491
2492                 goto ret;
2493         }
2494
2495         /* of all other cases */
2496         if (IC_LEFT (ic))
2497                 rmask = bitVectUnion (rmask,
2498                 rUmaskForOp (IC_LEFT (ic)));
2499
2500
2501         if (IC_RIGHT (ic))
2502                 rmask = bitVectUnion (rmask,
2503                 rUmaskForOp (IC_RIGHT (ic)));
2504
2505         if (IC_RESULT (ic))
2506                 rmask = bitVectUnion (rmask,
2507                 rUmaskForOp (IC_RESULT (ic)));
2508
2509 ret:
2510         return rmask;
2511 }
2512
2513 /*-----------------------------------------------------------------*/
2514 /* createRegMask - for each instruction will determine the regsUsed */
2515 /*-----------------------------------------------------------------*/
2516 static void
2517 createRegMask (eBBlock ** ebbs, int count)
2518 {
2519         int i;
2520
2521         debugLog ("%s\n", __FUNCTION__);
2522         /* for all blocks */
2523         for (i = 0; i < count; i++)
2524         {
2525                 iCode *ic;
2526
2527                 if (ebbs[i]->noPath &&
2528                         (ebbs[i]->entryLabel != entryLabel &&
2529                         ebbs[i]->entryLabel != returnLabel))
2530                         continue;
2531
2532                 /* for all instructions */
2533                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2534                 {
2535
2536                         int j;
2537
2538                         if (SKIP_IC2 (ic) || !ic->rlive)
2539                                 continue;
2540
2541                                 /* first mark the registers used in this
2542                         instruction */
2543                         ic->rUsed = regsUsedIniCode (ic);
2544                         _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2545
2546                         /* now create the register mask for those
2547                         registers that are in use : this is a
2548                         super set of ic->rUsed */
2549                         ic->rMask = newBitVect (pic14_nRegs + 1);
2550
2551                         /* for all live Ranges alive at this point */
2552                         for (j = 1; j < ic->rlive->size; j++)
2553                         {
2554                                 symbol *sym;
2555                                 int k;
2556
2557                                 /* if not alive then continue */
2558                                 if (!bitVectBitValue (ic->rlive, j))
2559                                         continue;
2560
2561                                 /* find the live range we are interested in */
2562                                 if (!(sym = hTabItemWithKey (liveRanges, j)))
2563                                 {
2564                                         werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2565                                                 "createRegMask cannot find live range");
2566                                         exit (0);
2567                                 }
2568
2569                                 /* if no register assigned to it */
2570                                 if (!sym->nRegs || sym->isspilt)
2571                                         continue;
2572
2573                                 /* for all the registers allocated to it */
2574                                 for (k = 0; k < sym->nRegs; k++)
2575                                         if (sym->regs[k])
2576                                                 ic->rMask =
2577                                                 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2578                         }
2579                 }
2580         }
2581 }
2582
2583 /*-----------------------------------------------------------------*/
2584 /* rematStr - returns the rematerialized string for a remat var    */
2585 /*-----------------------------------------------------------------*/
2586 static symbol *
2587 rematStr (symbol * sym)
2588 {
2589         char *s = buffer;
2590         iCode *ic = sym->rematiCode;
2591         symbol *psym = NULL;
2592
2593         debugLog ("%s\n", __FUNCTION__);
2594
2595         //printf ("%s\n", s);
2596
2597         /* if plus or minus print the right hand side */
2598
2599         if (ic->op == '+' || ic->op == '-') {
2600
2601                 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2602
2603                 sprintf (s, "(%s %c 0x%04x)",
2604                         OP_SYMBOL (IC_LEFT (ric))->rname,
2605                         ic->op,
2606                         (int) operandLitValue (IC_RIGHT (ic)));
2607
2608
2609                 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2610
2611                 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2612                 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2613
2614                 return psym;
2615         }
2616
2617         sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2618         psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2619
2620         //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2621         return psym;
2622 }
2623
2624 #if 0
2625 /*-----------------------------------------------------------------*/
2626 /* rematStr - returns the rematerialized string for a remat var    */
2627 /*-----------------------------------------------------------------*/
2628 static char *
2629 rematStr (symbol * sym)
2630 {
2631         char *s = buffer;
2632         iCode *ic = sym->rematiCode;
2633
2634         debugLog ("%s\n", __FUNCTION__);
2635         while (1)
2636         {
2637
2638                 printf ("%s\n", s);
2639                 /* if plus or minus print the right hand side */
2640                 /*
2641                 if (ic->op == '+' || ic->op == '-') {
2642                 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2643                 ic->op );
2644                 s += strlen(s);
2645                 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2646                 continue ;
2647                 }
2648                 */
2649                 if (ic->op == '+' || ic->op == '-')
2650                 {
2651                         iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2652                         sprintf (s, "(%s %c 0x%04x)",
2653                                 OP_SYMBOL (IC_LEFT (ric))->rname,
2654                                 ic->op,
2655                                 (int) operandLitValue (IC_RIGHT (ic)));
2656
2657                         //s += strlen(s);
2658                         //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2659                         //continue ;
2660                         //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2661                         return buffer;
2662                 }
2663
2664                 /* we reached the end */
2665                 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2666                 break;
2667         }
2668
2669         printf ("%s\n", buffer);
2670         return buffer;
2671 }
2672 #endif
2673
2674 /*-----------------------------------------------------------------*/
2675 /* regTypeNum - computes the type & number of registers required   */
2676 /*-----------------------------------------------------------------*/
2677 static void
2678 regTypeNum ()
2679 {
2680         symbol *sym;
2681         int k;
2682         iCode *ic;
2683
2684         debugLog ("%s\n", __FUNCTION__);
2685         /* for each live range do */
2686         for (sym = hTabFirstItem (liveRanges, &k); sym;
2687         sym = hTabNextItem (liveRanges, &k)) {
2688
2689                 debugLog ("  %d - %s\n", __LINE__, sym->rname);
2690
2691                 /* if used zero times then no registers needed */
2692                 if ((sym->liveTo - sym->liveFrom) == 0)
2693                         continue;
2694
2695
2696                 /* if the live range is a temporary */
2697                 if (sym->isitmp) {
2698
2699                         debugLog ("  %d - itemp register\n", __LINE__);
2700
2701                         /* if the type is marked as a conditional */
2702                         if (sym->regType == REG_CND)
2703                                 continue;
2704
2705                                 /* if used in return only then we don't
2706                         need registers */
2707                         if (sym->accuse) {
2708                                 if (IS_AGGREGATE (sym->type) || sym->isptr)
2709                                         sym->type = aggrToPtr (sym->type, FALSE);
2710                                 debugLog ("  %d - no reg needed - accumulator used\n", __LINE__);
2711
2712                                 continue;
2713                         }
2714
2715                         if (sym->ruonly) {
2716                                 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2717                                 //  sym->type = aggrToPtr (sym->type, FALSE);
2718                                 debugLog ("  %d - used as a return\n", __LINE__);
2719
2720                                 //continue;
2721                         }
2722
2723                         /* if the symbol has only one definition &
2724                         that definition is a get_pointer and the
2725                         pointer we are getting is rematerializable and
2726                         in "data" space */
2727
2728                         if (bitVectnBitsOn (sym->defs) == 1 &&
2729                                 (ic = hTabItemWithKey (iCodehTab,
2730                                 bitVectFirstBit (sym->defs))) &&
2731                                 POINTER_GET (ic) &&
2732                                 !sym->noSpilLoc &&
2733                                 !IS_BITVAR (sym->etype)) {
2734
2735
2736                                 debugLog ("  %d - \n", __LINE__);
2737
2738                                 /* if remat in data space */
2739                                 if (OP_SYMBOL (IC_LEFT (ic))->remat &&
2740                                         DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER) {
2741
2742                                         /* create a psuedo symbol & force a spil */
2743                                         //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2744                                         symbol *psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2745                                         psym->type = sym->type;
2746                                         psym->etype = sym->etype;
2747                                         strcpy (psym->rname, psym->name);
2748                                         sym->isspilt = 1;
2749                                         sym->usl.spillLoc = psym;
2750                                         continue;
2751                                 }
2752
2753                                 /* if in data space or idata space then try to
2754                                 allocate pointer register */
2755
2756                         }
2757
2758                         /* if not then we require registers */
2759                         sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2760                                 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2761                         getSize (sym->type));
2762
2763
2764                         if(IS_PTR_CONST (sym->type)) {
2765                                 debugLog ("  %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2766                                 sym->nRegs = 2;
2767                         }
2768
2769                         if (sym->nRegs > 4) {
2770                                 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2771                                 printTypeChain (sym->type, stderr);
2772                                 fprintf (stderr, "\n");
2773                         }
2774
2775                         /* determine the type of register required */
2776                         if (sym->nRegs == 1 &&
2777                                 IS_PTR (sym->type) &&
2778                                 sym->uptr)
2779                                 sym->regType = REG_PTR;
2780                         else
2781                                 sym->regType = REG_GPR;
2782
2783
2784                         debugLog ("  reg name %s,  reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2785
2786                 }
2787                 else
2788                         /* for the first run we don't provide */
2789                         /* registers for true symbols we will */
2790                         /* see how things go                  */
2791                         sym->nRegs = 0;
2792   }
2793
2794 }
2795 DEFSETFUNC (markRegFree)
2796 {
2797         ((regs *)item)->isFree = 1;
2798
2799         return 0;
2800 }
2801
2802 DEFSETFUNC (deallocReg)
2803 {
2804         fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2805         ((regs *)item)->isFree = 1;
2806         ((regs *)item)->wasUsed = 0;
2807
2808         return 0;
2809 }
2810 /*-----------------------------------------------------------------*/
2811 /* freeAllRegs - mark all registers as free                        */
2812 /*-----------------------------------------------------------------*/
2813 void
2814 pic14_freeAllRegs ()
2815 {
2816         //  int i;
2817
2818         debugLog ("%s\n", __FUNCTION__);
2819
2820         applyToSet(dynAllocRegs,markRegFree);
2821         applyToSet(dynStackRegs,markRegFree);
2822
2823         /*
2824         for (i = 0; i < pic14_nRegs; i++)
2825         regspic14[i].isFree = 1;
2826         */
2827 }
2828
2829 /*-----------------------------------------------------------------*/
2830 /*-----------------------------------------------------------------*/
2831 void
2832 pic14_deallocateAllRegs ()
2833 {
2834         //  int i;
2835
2836         debugLog ("%s\n", __FUNCTION__);
2837
2838         applyToSet(dynAllocRegs,deallocReg);
2839
2840         /*
2841         for (i = 0; i < pic14_nRegs; i++) {
2842                 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2843                 regspic14[i].isFree = 1;
2844                 regspic14[i].wasUsed = 0;
2845                 }
2846         }
2847         */
2848 }
2849
2850
2851 /*-----------------------------------------------------------------*/
2852 /* deallocStackSpil - this will set the stack pointer back         */
2853 /*-----------------------------------------------------------------*/
2854 static
2855 DEFSETFUNC (deallocStackSpil)
2856 {
2857         symbol *sym = item;
2858
2859         debugLog ("%s\n", __FUNCTION__);
2860         deallocLocal (sym);
2861         return 0;
2862 }
2863
2864 /*-----------------------------------------------------------------*/
2865 /* farSpacePackable - returns the packable icode for far variables */
2866 /*-----------------------------------------------------------------*/
2867 static iCode *
2868 farSpacePackable (iCode * ic)
2869 {
2870         iCode *dic;
2871
2872         debugLog ("%s\n", __FUNCTION__);
2873         /* go thru till we find a definition for the
2874         symbol on the right */
2875         for (dic = ic->prev; dic; dic = dic->prev)
2876         {
2877
2878                 /* if the definition is a call then no */
2879                 if ((dic->op == CALL || dic->op == PCALL) &&
2880                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2881                 {
2882                         return NULL;
2883                 }
2884
2885                 /* if shift by unknown amount then not */
2886                 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2887                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2888                         return NULL;
2889
2890                 /* if pointer get and size > 1 */
2891                 if (POINTER_GET (dic) &&
2892                         getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2893                         return NULL;
2894
2895                 if (POINTER_SET (dic) &&
2896                         getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2897                         return NULL;
2898
2899                 /* if any three is a true symbol in far space */
2900                 if (IC_RESULT (dic) &&
2901                         IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2902                         isOperandInFarSpace (IC_RESULT (dic)))
2903                         return NULL;
2904
2905                 if (IC_RIGHT (dic) &&
2906                         IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2907                         isOperandInFarSpace (IC_RIGHT (dic)) &&
2908                         !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2909                         return NULL;
2910
2911                 if (IC_LEFT (dic) &&
2912                         IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2913                         isOperandInFarSpace (IC_LEFT (dic)) &&
2914                         !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2915                         return NULL;
2916
2917                 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2918                 {
2919                         if ((dic->op == LEFT_OP ||
2920                                 dic->op == RIGHT_OP ||
2921                                 dic->op == '-') &&
2922                                 IS_OP_LITERAL (IC_RIGHT (dic)))
2923                                 return NULL;
2924                         else
2925                                 return dic;
2926                 }
2927         }
2928
2929         return NULL;
2930 }
2931
2932 /*-----------------------------------------------------------------*/
2933 /* packRegsForAssign - register reduction for assignment           */
2934 /*-----------------------------------------------------------------*/
2935 static int
2936 packRegsForAssign (iCode * ic, eBBlock * ebp)
2937 {
2938
2939         iCode *dic, *sic;
2940
2941         debugLog ("%s\n", __FUNCTION__);
2942
2943         debugAopGet ("  result:", IC_RESULT (ic));
2944         debugAopGet ("  left:", IC_LEFT (ic));
2945         debugAopGet ("  right:", IC_RIGHT (ic));
2946
2947         /* if this is at an absolute address, then get the address. */
2948         if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2949                 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2950                         debugLog ("  %d - found config word declaration\n", __LINE__);
2951                         if(IS_VALOP(IC_RIGHT(ic))) {
2952                                 debugLog ("  setting config word to %x\n",
2953                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2954                                 assignConfigWordValue(  SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2955                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2956                         }
2957
2958                         /* remove the assignment from the iCode chain. */
2959
2960                         remiCodeFromeBBlock (ebp, ic);
2961                         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2962                         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2963
2964                         return 1;
2965
2966                 }
2967         }
2968
2969         if (!IS_ITEMP (IC_RESULT (ic))) {
2970                 allocDirReg(IC_RESULT (ic));
2971                 debugLog ("  %d - result is not temp\n", __LINE__);
2972         }
2973         /*
2974         if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2975         debugLog ("  %d - left is not temp, allocating\n", __LINE__);
2976         allocDirReg(IC_LEFT (ic));
2977         }
2978         */
2979
2980         if (!IS_ITEMP (IC_RIGHT (ic))) {
2981                 debugLog ("  %d - not packing - right is not temp\n", __LINE__);
2982
2983                 /* only pack if this is not a function pointer */
2984                 if (!IS_REF (IC_RIGHT (ic)))
2985                         allocDirReg(IC_RIGHT (ic));
2986                 return 0;
2987         }
2988
2989         if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2990                 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2991         {
2992                 debugLog ("  %d - not packing - right side fails \n", __LINE__);
2993                 return 0;
2994         }
2995
2996         /* if the true symbol is defined in far space or on stack
2997         then we should not since this will increase register pressure */
2998         if (isOperandInFarSpace (IC_RESULT (ic)))
2999         {
3000                 if ((dic = farSpacePackable (ic)))
3001                         goto pack;
3002                 else
3003                         return 0;
3004
3005         }
3006         /* find the definition of iTempNN scanning backwards if we find a
3007         a use of the true symbol before we find the definition then
3008         we cannot pack */
3009         for (dic = ic->prev; dic; dic = dic->prev)
3010         {
3011
3012         /* if there is a function call and this is
3013                 a parameter & not my parameter then don't pack it */
3014                 if ((dic->op == CALL || dic->op == PCALL) &&
3015                         (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
3016                         !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
3017                 {
3018                         debugLog ("  %d - \n", __LINE__);
3019                         dic = NULL;
3020                         break;
3021                 }
3022
3023                 if (SKIP_IC2 (dic))
3024                         continue;
3025
3026                 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3027                         IS_OP_VOLATILE (IC_RESULT (dic)))
3028                 {
3029                         debugLog ("  %d - dic is VOLATILE \n", __LINE__);
3030                         dic = NULL;
3031                         break;
3032                 }
3033
3034                 if (IS_SYMOP (IC_RESULT (dic)) &&
3035                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3036                 {
3037                         /* A previous result was assigned to the same register - we'll our definition */
3038                         debugLog ("  %d - dic result key == ic right key -- pointer set=%c\n",
3039                                 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3040                         if (POINTER_SET (dic))
3041                                 dic = NULL;
3042
3043                         break;
3044                 }
3045
3046                 if (IS_SYMOP (IC_RIGHT (dic)) &&
3047                         (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3048                         IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3049                 {
3050                         debugLog ("  %d - dic right key == ic rightor result key\n", __LINE__);
3051                         dic = NULL;
3052                         break;
3053                 }
3054
3055                 if (IS_SYMOP (IC_LEFT (dic)) &&
3056                         (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3057                         IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3058                 {
3059                         debugLog ("  %d - dic left key == ic rightor result key\n", __LINE__);
3060                         dic = NULL;
3061                         break;
3062                 }
3063
3064                 if (POINTER_SET (dic) &&
3065                         IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3066                 {
3067                         debugLog ("  %d - dic result key == ic result key -- pointer set=Y\n",
3068                                 __LINE__);
3069                         dic = NULL;
3070                         break;
3071                 }
3072         }
3073
3074         if (!dic)
3075                 return 0;                       /* did not find */
3076
3077                                                         /* if the result is on stack or iaccess then it must be
3078         the same atleast one of the operands */
3079         if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3080                 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3081         {
3082
3083         /* the operation has only one symbol
3084                 operator then we can pack */
3085                 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3086                         (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3087                         goto pack;
3088
3089                 if (!((IC_LEFT (dic) &&
3090                         IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3091                         (IC_RIGHT (dic) &&
3092                         IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3093                         return 0;
3094         }
3095 pack:
3096         debugLog ("  packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3097         debugLog ("  replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3098         /* found the definition */
3099         /* replace the result with the result of */
3100         /* this assignment and remove this assignment */
3101         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3102         IC_RESULT (dic) = IC_RESULT (ic);
3103
3104         if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3105         {
3106                 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3107         }
3108         /* delete from liverange table also
3109         delete from all the points inbetween and the new
3110         one */
3111         for (sic = dic; sic != ic; sic = sic->next)
3112         {
3113                 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3114                 if (IS_ITEMP (IC_RESULT (dic)))
3115                         bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3116         }
3117
3118         remiCodeFromeBBlock (ebp, ic);
3119         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3120         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3121         OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3122         return 1;
3123
3124
3125 }
3126
3127 /*-----------------------------------------------------------------*/
3128 /* findAssignToSym : scanning backwards looks for first assig found */
3129 /*-----------------------------------------------------------------*/
3130 static iCode *
3131 findAssignToSym (operand * op, iCode * ic)
3132 {
3133         iCode *dic;
3134
3135         debugLog ("%s\n", __FUNCTION__);
3136         for (dic = ic->prev; dic; dic = dic->prev)
3137         {
3138
3139                 /* if definition by assignment */
3140                 if (dic->op == '=' &&
3141                         !POINTER_SET (dic) &&
3142                         IC_RESULT (dic)->key == op->key
3143                         /*          &&  IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3144                         )
3145                 {
3146
3147                         /* we are interested only if defined in far space */
3148                         /* or in stack space in case of + & - */
3149
3150                         /* if assigned to a non-symbol then return
3151                         true */
3152                         if (!IS_SYMOP (IC_RIGHT (dic)))
3153                                 break;
3154
3155                                 /* if the symbol is in far space then
3156                         we should not */
3157                         if (isOperandInFarSpace (IC_RIGHT (dic)))
3158                                 return NULL;
3159
3160                                 /* for + & - operations make sure that
3161                                 if it is on the stack it is the same
3162                         as one of the three operands */
3163                         if ((ic->op == '+' || ic->op == '-') &&
3164                                 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3165                         {
3166
3167                                 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3168                                         IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3169                                         IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3170                                         return NULL;
3171                         }
3172
3173                         break;
3174
3175                 }
3176
3177                 /* if we find an usage then we cannot delete it */
3178                 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3179                         return NULL;
3180
3181                 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3182                         return NULL;
3183
3184                 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3185                         return NULL;
3186         }
3187
3188         /* now make sure that the right side of dic
3189         is not defined between ic & dic */
3190         if (dic)
3191         {
3192                 iCode *sic = dic->next;
3193
3194                 for (; sic != ic; sic = sic->next)
3195                         if (IC_RESULT (sic) &&
3196                                 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3197                                 return NULL;
3198         }
3199
3200         return dic;
3201
3202
3203 }
3204
3205 /*-----------------------------------------------------------------*/
3206 /* packRegsForSupport :- reduce some registers for support calls   */
3207 /*-----------------------------------------------------------------*/
3208 static int
3209 packRegsForSupport (iCode * ic, eBBlock * ebp)
3210 {
3211         int change = 0;
3212
3213         debugLog ("%s\n", __FUNCTION__);
3214         /* for the left & right operand :- look to see if the
3215         left was assigned a true symbol in far space in that
3216         case replace them */
3217         if (IS_ITEMP (IC_LEFT (ic)) &&
3218                 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3219         {
3220                 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3221                 iCode *sic;
3222
3223                 if (!dic)
3224                         goto right;
3225
3226                 debugAopGet ("removing left:", IC_LEFT (ic));
3227
3228                 /* found it we need to remove it from the
3229                 block */
3230                 for (sic = dic; sic != ic; sic = sic->next)
3231                         bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3232
3233                 IC_LEFT (ic)->operand.symOperand =
3234                         IC_RIGHT (dic)->operand.symOperand;
3235                 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3236                 remiCodeFromeBBlock (ebp, dic);
3237                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3238                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3239                 change++;
3240         }
3241
3242         /* do the same for the right operand */
3243 right:
3244         if (!change &&
3245                 IS_ITEMP (IC_RIGHT (ic)) &&
3246                 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3247         {
3248                 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3249                 iCode *sic;
3250
3251                 if (!dic)
3252                         return change;
3253
3254                         /* if this is a subtraction & the result
3255                 is a true symbol in far space then don't pack */
3256                 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3257                 {
3258                         sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3259                         if (IN_FARSPACE (SPEC_OCLS (etype)))
3260                                 return change;
3261                 }
3262
3263                 debugAopGet ("removing right:", IC_RIGHT (ic));
3264
3265                 /* found it we need to remove it from the
3266                 block */
3267                 for (sic = dic; sic != ic; sic = sic->next)
3268                         bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3269
3270                 IC_RIGHT (ic)->operand.symOperand =
3271                         IC_RIGHT (dic)->operand.symOperand;
3272                 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3273
3274                 remiCodeFromeBBlock (ebp, dic);
3275                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3276                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3277                 change++;
3278         }
3279
3280         return change;
3281 }
3282
3283 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3284
3285
3286 /*-----------------------------------------------------------------*/
3287 /* packRegsForOneuse : - will reduce some registers for single Use */
3288 /*-----------------------------------------------------------------*/
3289 static iCode *
3290 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3291 {
3292         bitVect *uses;
3293         iCode *dic, *sic;
3294
3295         debugLog ("%s\n", __FUNCTION__);
3296         /* if returning a literal then do nothing */
3297         if (!IS_SYMOP (op))
3298                 return NULL;
3299
3300                 /* only upto 2 bytes since we cannot predict
3301         the usage of b, & acc */
3302         if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3303                 ic->op != RETURN &&
3304                 ic->op != SEND)
3305                 return NULL;
3306
3307                 /* this routine will mark the a symbol as used in one
3308                 instruction use only && if the definition is local
3309                 (ie. within the basic block) && has only one definition &&
3310                 that definition is either a return value from a
3311                 function or does not contain any variables in
3312         far space */
3313         uses = bitVectCopy (OP_USES (op));
3314         bitVectUnSetBit (uses, ic->key);        /* take away this iCode */
3315         if (!bitVectIsZero (uses))      /* has other uses */
3316                 return NULL;
3317
3318         /* if it has only one defintion */
3319         if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3320                 return NULL;            /* has more than one definition */
3321
3322         /* get that definition */
3323         if (!(dic =
3324                 hTabItemWithKey (iCodehTab,
3325                 bitVectFirstBit (OP_DEFS (op)))))
3326                 return NULL;
3327
3328         /* found the definition now check if it is local */
3329         if (dic->seq < ebp->fSeq ||
3330                 dic->seq > ebp->lSeq)
3331                 return NULL;            /* non-local */
3332
3333                                                         /* now check if it is the return from
3334         a function call */
3335         if (dic->op == CALL || dic->op == PCALL)
3336         {
3337                 if (ic->op != SEND && ic->op != RETURN &&
3338                         !POINTER_SET(ic) && !POINTER_GET(ic))
3339                 {
3340                         OP_SYMBOL (op)->ruonly = 1;
3341                         return dic;
3342                 }
3343                 dic = dic->next;
3344         }
3345
3346
3347         /* otherwise check that the definition does
3348         not contain any symbols in far space */
3349         if (isOperandInFarSpace (IC_LEFT (dic)) ||
3350                 isOperandInFarSpace (IC_RIGHT (dic)) ||
3351                 IS_OP_RUONLY (IC_LEFT (ic)) ||
3352                 IS_OP_RUONLY (IC_RIGHT (ic)))
3353         {
3354                 return NULL;
3355         }
3356
3357         /* if pointer set then make sure the pointer
3358         is one byte */
3359         if (POINTER_SET (dic) &&
3360                 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3361                 return NULL;
3362
3363         if (POINTER_GET (dic) &&
3364                 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3365                 return NULL;
3366
3367         sic = dic;
3368
3369         /* also make sure the intervenening instructions
3370         don't have any thing in far space */
3371         for (dic = dic->next; dic && dic != ic; dic = dic->next)
3372         {
3373
3374                 /* if there is an intervening function call then no */
3375                 if (dic->op == CALL || dic->op == PCALL)
3376                         return NULL;
3377                         /* if pointer set then make sure the pointer
3378                 is one byte */
3379                 if (POINTER_SET (dic) &&
3380                         !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3381                         return NULL;
3382
3383                 if (POINTER_GET (dic) &&
3384                         !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3385                         return NULL;
3386
3387                 /* if address of & the result is remat then okay */
3388                 if (dic->op == ADDRESS_OF &&
3389                         OP_SYMBOL (IC_RESULT (dic))->remat)
3390                         continue;
3391
3392                         /* if operand has size of three or more & this
3393                         operation is a '*','/' or '%' then 'b' may
3394                 cause a problem */
3395                 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3396                         getSize (operandType (op)) >= 3)
3397                         return NULL;
3398
3399                 /* if left or right or result is in far space */
3400                 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3401                         isOperandInFarSpace (IC_RIGHT (dic)) ||
3402                         isOperandInFarSpace (IC_RESULT (dic)) ||
3403                         IS_OP_RUONLY (IC_LEFT (dic)) ||
3404                         IS_OP_RUONLY (IC_RIGHT (dic)) ||
3405                         IS_OP_RUONLY (IC_RESULT (dic)))
3406                 {
3407                         return NULL;
3408                 }
3409         }
3410
3411         OP_SYMBOL (op)->ruonly = 1;
3412         return sic;
3413
3414 }
3415
3416 /*-----------------------------------------------------------------*/
3417 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN          */
3418 /*-----------------------------------------------------------------*/
3419 static bool
3420 isBitwiseOptimizable (iCode * ic)
3421 {
3422         sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3423         sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3424
3425         debugLog ("%s\n", __FUNCTION__);
3426         /* bitwise operations are considered optimizable
3427         under the following conditions (Jean-Louis VERN)
3428
3429           x & lit
3430           bit & bit
3431           bit & x
3432           bit ^ bit
3433           bit ^ x
3434           x   ^ lit
3435           x   | lit
3436           bit | bit
3437           bit | x
3438         */
3439         if (IS_LITERAL (rtype) ||
3440                 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3441                 return TRUE;
3442         else
3443                 return FALSE;
3444 }
3445
3446 /*-----------------------------------------------------------------*/
3447 /* packRegsForAccUse - pack registers for acc use                  */
3448 /*-----------------------------------------------------------------*/
3449 static void
3450 packRegsForAccUse (iCode * ic)
3451 {
3452         iCode *uic;
3453
3454         debugLog ("%s\n", __FUNCTION__);
3455
3456         /* if this is an aggregate, e.g. a one byte char array */
3457         if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3458                 return;
3459         }
3460         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3461
3462         /* if + or - then it has to be one byte result */
3463         if ((ic->op == '+' || ic->op == '-')
3464                 && getSize (operandType (IC_RESULT (ic))) > 1)
3465                 return;
3466
3467         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3468         /* if shift operation make sure right side is not a literal */
3469         if (ic->op == RIGHT_OP &&
3470                 (isOperandLiteral (IC_RIGHT (ic)) ||
3471                 getSize (operandType (IC_RESULT (ic))) > 1))
3472                 return;
3473
3474         if (ic->op == LEFT_OP &&
3475                 (isOperandLiteral (IC_RIGHT (ic)) ||
3476                 getSize (operandType (IC_RESULT (ic))) > 1))
3477                 return;
3478
3479         if (IS_BITWISE_OP (ic) &&
3480                 getSize (operandType (IC_RESULT (ic))) > 1)
3481                 return;
3482
3483
3484         /* has only one definition */
3485         if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3486                 return;
3487
3488         /* has only one use */
3489         if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3490                 return;
3491
3492         /* and the usage immediately follows this iCode */
3493         if (!(uic = hTabItemWithKey (iCodehTab,
3494                 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3495                 return;
3496
3497         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3498         if (ic->next != uic)
3499                 return;
3500
3501         /* if it is a conditional branch then we definitely can */
3502         if (uic->op == IFX)
3503                 goto accuse;
3504
3505         if (uic->op == JUMPTABLE)
3506                 return;
3507
3508                 /* if the usage is not is an assignment
3509         or an arithmetic / bitwise / shift operation then not */
3510         if (POINTER_SET (uic) &&
3511                 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3512                 return;
3513
3514         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3515         if (uic->op != '=' &&
3516                 !IS_ARITHMETIC_OP (uic) &&
3517                 !IS_BITWISE_OP (uic) &&
3518                 uic->op != LEFT_OP &&
3519                 uic->op != RIGHT_OP)
3520                 return;
3521
3522         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3523         /* if used in ^ operation then make sure right is not a
3524         literl */
3525         if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3526                 return;
3527
3528         /* if shift operation make sure right side is not a literal */
3529         if (uic->op == RIGHT_OP &&
3530                 (isOperandLiteral (IC_RIGHT (uic)) ||
3531                 getSize (operandType (IC_RESULT (uic))) > 1))
3532                 return;
3533
3534         if (uic->op == LEFT_OP &&
3535                 (isOperandLiteral (IC_RIGHT (uic)) ||
3536                 getSize (operandType (IC_RESULT (uic))) > 1))
3537                 return;
3538
3539                 /* make sure that the result of this icode is not on the
3540         stack, since acc is used to compute stack offset */
3541         if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3542                 OP_SYMBOL (IC_RESULT (uic))->onStack)
3543                 return;
3544
3545         /* if either one of them in far space then we cannot */
3546         if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3547                 isOperandInFarSpace (IC_LEFT (uic))) ||
3548                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3549                 isOperandInFarSpace (IC_RIGHT (uic))))
3550                 return;
3551
3552         /* if the usage has only one operand then we can */
3553         if (IC_LEFT (uic) == NULL ||
3554                 IC_RIGHT (uic) == NULL)
3555                 goto accuse;
3556
3557                 /* make sure this is on the left side if not
3558         a '+' since '+' is commutative */
3559         if (ic->op != '+' &&
3560                 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3561                 return;
3562
3563         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3564         /* if one of them is a literal then we can */
3565         if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3566                 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic))))  &&
3567                 (getSize (operandType (IC_RESULT (uic))) <= 1))
3568         {
3569                 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3570                 return;
3571         }
3572
3573         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3574         /* if the other one is not on stack then we can */
3575         if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3576                 (IS_ITEMP (IC_RIGHT (uic)) ||
3577                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3578                 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3579                 goto accuse;
3580
3581         if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3582                 (IS_ITEMP (IC_LEFT (uic)) ||
3583                 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3584                 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3585                 goto accuse;
3586
3587         return;
3588
3589 accuse:
3590         debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3591         OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3592
3593
3594 }
3595
3596 /*-----------------------------------------------------------------*/
3597 /* packForPush - hueristics to reduce iCode for pushing            */
3598 /*-----------------------------------------------------------------*/
3599 static void
3600 packForReceive (iCode * ic, eBBlock * ebp)
3601 {
3602         iCode *dic;
3603
3604         debugLog ("%s\n", __FUNCTION__);
3605         debugAopGet ("  result:", IC_RESULT (ic));
3606         debugAopGet ("  left:", IC_LEFT (ic));
3607         debugAopGet ("  right:", IC_RIGHT (ic));
3608
3609         if (!ic->next)
3610                 return;
3611
3612         for (dic = ic->next; dic; dic = dic->next)
3613         {
3614
3615
3616
3617                 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3618                         debugLog ("    used on left\n");
3619                 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3620                         debugLog ("    used on right\n");
3621                 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3622                         debugLog ("    used on result\n");
3623
3624                 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3625                         (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3626                         return;
3627
3628         }
3629
3630         debugLog ("  hey we can remove this unnecessary assign\n");
3631 }
3632 /*-----------------------------------------------------------------*/
3633 /* packForPush - hueristics to reduce iCode for pushing            */
3634 /*-----------------------------------------------------------------*/
3635 static void
3636 packForPush (iCode * ic, eBBlock * ebp)
3637 {
3638         iCode *dic;
3639
3640         debugLog ("%s\n", __FUNCTION__);
3641         if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3642                 return;
3643
3644         /* must have only definition & one usage */
3645         if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3646                 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3647                 return;
3648
3649         /* find the definition */
3650         if (!(dic = hTabItemWithKey (iCodehTab,
3651                 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3652                 return;
3653
3654         if (dic->op != '=' || POINTER_SET (dic))
3655                 return;
3656
3657                 /* we now we know that it has one & only one def & use
3658         and the that the definition is an assignment */
3659         IC_LEFT (ic) = IC_RIGHT (dic);
3660
3661         remiCodeFromeBBlock (ebp, dic);
3662         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3663         hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3664 }
3665
3666 void printSymType(char * str, sym_link *sl)
3667 {
3668         debugLog ("    %s Symbol type: ",str);
3669         printTypeChain( sl, debugF);
3670         debugLog ("\n");
3671
3672 }
3673
3674 /*-----------------------------------------------------------------*/
3675 /* some debug code to print the symbol S_TYPE. Note that
3676 * the function checkSClass in src/SDCCsymt.c dinks with
3677 * the S_TYPE in ways the PIC port doesn't fully like...*/
3678 /*-----------------------------------------------------------------*/
3679 void isData(sym_link *sl)
3680 {
3681         FILE *of = stderr;
3682
3683         if(!sl)
3684                 return;
3685
3686         if(debugF)
3687                 of = debugF;
3688
3689         for ( ; sl; sl=sl->next) {
3690                 if(!IS_DECL(sl) ) {
3691                         switch (SPEC_SCLS(sl)) {
3692
3693                         case S_DATA: fprintf (of, "data "); break;
3694                         case S_XDATA: fprintf (of, "xdata "); break;
3695                         case S_SFR: fprintf (of, "sfr "); break;
3696                         case S_SBIT: fprintf (of, "sbit "); break;
3697                         case S_CODE: fprintf (of, "code "); break;
3698                         case S_IDATA: fprintf (of, "idata "); break;
3699                         case S_PDATA: fprintf (of, "pdata "); break;
3700                         case S_LITERAL: fprintf (of, "literal "); break;
3701                         case S_STACK: fprintf (of, "stack "); break;
3702                         case S_XSTACK: fprintf (of, "xstack "); break;
3703                         case S_BIT: fprintf (of, "bit "); break;
3704                         case S_EEPROM: fprintf (of, "eeprom "); break;
3705                         default: break;
3706                         }
3707
3708                 }
3709
3710         }
3711
3712 }
3713 /*-----------------------------------------------------------------*/
3714 /* packRegisters - does some transformations to reduce register    */
3715 /*                   pressure                                      */
3716 /*-----------------------------------------------------------------*/
3717 static void
3718 packRegisters (eBBlock * ebp)
3719 {
3720         iCode *ic;
3721         int change = 0;
3722
3723         debugLog ("%s\n", __FUNCTION__);
3724
3725         while (1) {
3726
3727                 change = 0;
3728
3729                 /* look for assignments of the form */
3730                 /* iTempNN = TRueSym (someoperation) SomeOperand */
3731                 /*       ....                       */
3732                 /* TrueSym := iTempNN:1             */
3733                 for (ic = ebp->sch; ic; ic = ic->next)
3734                 {
3735
3736                         /* find assignment of the form TrueSym := iTempNN:1 */
3737                         if (ic->op == '=' && !POINTER_SET (ic))
3738                                 change += packRegsForAssign (ic, ebp);
3739                         /* debug stuff */
3740                         if (ic->op == '=')
3741                         {
3742                                 if (POINTER_SET (ic))
3743                                         debugLog ("pointer is set\n");
3744                                 debugAopGet ("  result:", IC_RESULT (ic));
3745                                 debugAopGet ("  left:", IC_LEFT (ic));
3746                                 debugAopGet ("  right:", IC_RIGHT (ic));
3747                         }
3748
3749                 }
3750
3751                 if (!change)
3752                         break;
3753         }
3754
3755         for (ic = ebp->sch; ic; ic = ic->next) {
3756
3757                 if(IS_SYMOP ( IC_LEFT(ic))) {
3758                         sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3759
3760                         debugAopGet ("  left:", IC_LEFT (ic));
3761                         if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3762                                 debugLog ("    is a pointer\n");
3763
3764                         if(IS_OP_VOLATILE(IC_LEFT(ic)))
3765                                 debugLog ("    is volatile\n");
3766
3767                         isData(etype);
3768
3769                         printSymType("   ", OP_SYMBOL(IC_LEFT(ic))->type);
3770                 }
3771
3772                 if(IS_SYMOP ( IC_RIGHT(ic))) {
3773                         debugAopGet ("  right:", IC_RIGHT (ic));
3774                         printSymType("    ", OP_SYMBOL(IC_RIGHT(ic))->type);
3775                 }
3776
3777                 if(IS_SYMOP ( IC_RESULT(ic))) {
3778                         debugAopGet ("  result:", IC_RESULT (ic));
3779                         printSymType("     ", OP_SYMBOL(IC_RESULT(ic))->type);
3780                 }
3781
3782                 if (POINTER_SET (ic))
3783                         debugLog ("  %d - Pointer set\n", __LINE__);
3784
3785
3786                         /* if this is an itemp & result of a address of a true sym
3787                 then mark this as rematerialisable   */
3788                 if (ic->op == ADDRESS_OF &&
3789                         IS_ITEMP (IC_RESULT (ic)) &&
3790                         IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3791                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3792                         !OP_SYMBOL (IC_LEFT (ic))->onStack)
3793                 {
3794
3795                         debugLog ("  %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3796
3797                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3798                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3799                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3800
3801                 }
3802
3803                 /* if straight assignment then carry remat flag if
3804                 this is the only definition */
3805                 if (ic->op == '=' &&
3806                         !POINTER_SET (ic) &&
3807                         IS_SYMOP (IC_RIGHT (ic)) &&
3808                         OP_SYMBOL (IC_RIGHT (ic))->remat &&
3809                         bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3810                 {
3811                         debugLog ("  %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3812
3813                         OP_SYMBOL (IC_RESULT (ic))->remat =
3814                                 OP_SYMBOL (IC_RIGHT (ic))->remat;
3815                         OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3816                                 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3817                 }
3818
3819                 /* if this is a +/- operation with a rematerizable
3820                 then mark this as rematerializable as well */
3821                 if ((ic->op == '+' || ic->op == '-') &&
3822                         (IS_SYMOP (IC_LEFT (ic)) &&
3823                         IS_ITEMP (IC_RESULT (ic)) &&
3824                         OP_SYMBOL (IC_LEFT (ic))->remat &&
3825                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3826                         IS_OP_LITERAL (IC_RIGHT (ic))))
3827                 {
3828                         debugLog ("  %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3829                         //int i =
3830                         operandLitValue (IC_RIGHT (ic));
3831                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3832                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3833                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3834                 }
3835
3836                 /* mark the pointer usages */
3837                 if (POINTER_SET (ic))
3838                 {
3839                         OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3840                         debugLog ("  marking as a pointer (set) =>");
3841                         debugAopGet ("  result:", IC_RESULT (ic));
3842                 }
3843                 if (POINTER_GET (ic))
3844                 {
3845                         OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3846                         debugLog ("  marking as a pointer (get) =>");
3847                         debugAopGet ("  left:", IC_LEFT (ic));
3848                 }
3849
3850                 if (!SKIP_IC2 (ic))
3851                 {
3852                 /* if we are using a symbol on the stack
3853                         then we should say pic14_ptrRegReq */
3854                         if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3855                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3856                                 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3857                         else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3858                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3859                                 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3860                         else
3861                         {
3862                                 if (IS_SYMOP (IC_LEFT (ic)))
3863                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3864                                         OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3865                                 if (IS_SYMOP (IC_RIGHT (ic)))
3866                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3867                                         OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3868                                 if (IS_SYMOP (IC_RESULT (ic)))
3869                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3870                                         OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3871                         }
3872
3873                         debugLog ("  %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3874
3875                 }
3876
3877                 /* if the condition of an if instruction
3878                 is defined in the previous instruction then
3879                 mark the itemp as a conditional */
3880                 if ((IS_CONDITIONAL (ic) ||
3881                         ((ic->op == BITWISEAND ||
3882                         ic->op == '|' ||
3883                         ic->op == '^') &&
3884                         isBitwiseOptimizable (ic))) &&
3885                         ic->next && ic->next->op == IFX &&
3886                         isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3887                         OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3888                 {
3889
3890                         debugLog ("  %d\n", __LINE__);
3891                         OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3892                         continue;
3893                 }
3894
3895                 /* reduce for support function calls */
3896                 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3897                         packRegsForSupport (ic, ebp);
3898
3899                 /* if a parameter is passed, it's in W, so we may not
3900                 need to place a copy in a register */
3901                 if (ic->op == RECEIVE)
3902                         packForReceive (ic, ebp);
3903
3904                 /* some cases the redundant moves can
3905                 can be eliminated for return statements */
3906                 if ((ic->op == RETURN || ic->op == SEND) &&
3907                         !isOperandInFarSpace (IC_LEFT (ic)) &&
3908                         !options.model)
3909                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3910
3911                 /* if pointer set & left has a size more than
3912                 one and right is not in far space */
3913                 if (POINTER_SET (ic) &&
3914                         !isOperandInFarSpace (IC_RIGHT (ic)) &&
3915                         !OP_SYMBOL (IC_RESULT (ic))->remat &&
3916                         !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3917                         getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3918
3919                         packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3920
3921                 /* if pointer get */
3922                 if (POINTER_GET (ic) &&
3923                         !isOperandInFarSpace (IC_RESULT (ic)) &&
3924                         !OP_SYMBOL (IC_LEFT (ic))->remat &&
3925                         !IS_OP_RUONLY (IC_RESULT (ic)) &&
3926                         getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3927
3928                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3929
3930
3931                         /* if this is cast for intergral promotion then
3932                         check if only use of  the definition of the
3933                         operand being casted/ if yes then replace
3934                         the result of that arithmetic operation with
3935                 this result and get rid of the cast */
3936                 if (ic->op == CAST) {
3937
3938                         sym_link *fromType = operandType (IC_RIGHT (ic));
3939                         sym_link *toType = operandType (IC_LEFT (ic));
3940
3941                         debugLog ("  %d - casting\n", __LINE__);
3942
3943                         if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3944                                 getSize (fromType) != getSize (toType)) {
3945
3946
3947                                 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3948                                 if (dic) {
3949
3950                                         if (IS_ARITHMETIC_OP (dic)) {
3951
3952                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3953                                                 IC_RESULT (dic) = IC_RESULT (ic);
3954                                                 remiCodeFromeBBlock (ebp, ic);
3955                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3956                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3957                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3958                                                 ic = ic->prev;
3959                                         }  else
3960
3961                                                 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3962                                 }
3963                         } else {
3964
3965                         /* if the type from and type to are the same
3966                                 then if this is the only use then packit */
3967                                 if (compareType (operandType (IC_RIGHT (ic)),
3968                                         operandType (IC_LEFT (ic))) == 1) {
3969
3970                                         iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3971                                         if (dic) {
3972
3973                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3974                                                 IC_RESULT (dic) = IC_RESULT (ic);
3975                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3976                                                 remiCodeFromeBBlock (ebp, ic);
3977                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3978                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3979                                                 ic = ic->prev;
3980                                         }
3981                                 }
3982                         }
3983                 }
3984
3985                 /* pack for PUSH
3986                 iTempNN := (some variable in farspace) V1
3987                 push iTempNN ;
3988                 -------------
3989                 push V1
3990                 */
3991                 if (ic->op == IPUSH)
3992                 {
3993                         packForPush (ic, ebp);
3994                 }
3995
3996
3997                 /* pack registers for accumulator use, when the
3998                 result of an arithmetic or bit wise operation
3999                 has only one use, that use is immediately following
4000                 the defintion and the using iCode has only one
4001                 operand or has two operands but one is literal &
4002                 the result of that operation is not on stack then
4003                 we can leave the result of this operation in acc:b
4004                 combination */
4005                 if ((IS_ARITHMETIC_OP (ic)
4006
4007                         || IS_BITWISE_OP (ic)
4008
4009                         || ic->op == LEFT_OP || ic->op == RIGHT_OP
4010
4011                         ) &&
4012                         IS_ITEMP (IC_RESULT (ic)) &&
4013                         getSize (operandType (IC_RESULT (ic))) <= 2)
4014
4015                         packRegsForAccUse (ic);
4016
4017   }
4018 }
4019
4020 static void
4021 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4022 {
4023         int i;
4024
4025         if (!debug || !debugF)
4026                 return;
4027
4028         for (i = 0; i < count; i++)
4029         {
4030                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4031                 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4032                         ebbs[i]->entryLabel->name,
4033                         ebbs[i]->depth,
4034                         ebbs[i]->noPath,
4035                         ebbs[i]->isLastInLoop);
4036                 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4037                         ebbs[i]->dfnum,
4038                         ebbs[i]->bbnum,
4039                         ebbs[i]->fSeq,
4040                         ebbs[i]->lSeq);
4041                 fprintf (debugF, "visited %d : hasFcall = %d\n",
4042                         ebbs[i]->visited,
4043                         ebbs[i]->hasFcall);
4044
4045                 fprintf (debugF, "\ndefines bitVector :");
4046                 bitVectDebugOn (ebbs[i]->defSet, debugF);
4047                 fprintf (debugF, "\nlocal defines bitVector :");
4048                 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4049                 fprintf (debugF, "\npointers Set bitvector :");
4050                 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4051                 fprintf (debugF, "\nin pointers Set bitvector :");
4052                 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4053                 fprintf (debugF, "\ninDefs Set bitvector :");
4054                 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4055                 fprintf (debugF, "\noutDefs Set bitvector :");
4056                 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4057                 fprintf (debugF, "\nusesDefs Set bitvector :");
4058                 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4059                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4060                 printiCChain (ebbs[i]->sch, debugF);
4061         }
4062 }
4063 /*-----------------------------------------------------------------*/
4064 /* assignRegisters - assigns registers to each live range as need  */
4065 /*-----------------------------------------------------------------*/
4066 void
4067 pic14_assignRegisters (eBBlock ** ebbs, int count)
4068 {
4069         iCode *ic;
4070         int i;
4071
4072         debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4073         debugLog ("\nebbs before optimizing:\n");
4074         dumpEbbsToDebug (ebbs, count);
4075
4076         setToNull ((void *) &_G.funcrUsed);
4077         pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4078
4079
4080         /* change assignments this will remove some
4081         live ranges reducing some register pressure */
4082         for (i = 0; i < count; i++)
4083                 packRegisters (ebbs[i]);
4084
4085         {
4086                 regs *reg;
4087                 int hkey;
4088                 int i=0;
4089
4090                 debugLog("dir registers allocated so far:\n");
4091                 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4092
4093                 while(reg) {
4094                         debugLog("  -- #%d reg = %s  key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4095                         reg = hTabNextItem(dynDirectRegNames, &hkey);
4096                 }
4097
4098         }
4099
4100         if (options.dump_pack)
4101                 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4102
4103                 /* first determine for each live range the number of
4104         registers & the type of registers required for each */
4105         regTypeNum ();
4106
4107         /* and serially allocate registers */
4108         serialRegAssign (ebbs, count);
4109
4110         /* if stack was extended then tell the user */
4111         if (_G.stackExtend)
4112         {
4113                 /*      werror(W_TOOMANY_SPILS,"stack", */
4114                 /*             _G.stackExtend,currFunc->name,""); */
4115                 _G.stackExtend = 0;
4116         }
4117
4118         if (_G.dataExtend)
4119         {
4120                 /*      werror(W_TOOMANY_SPILS,"data space", */
4121                 /*             _G.dataExtend,currFunc->name,""); */
4122                 _G.dataExtend = 0;
4123         }
4124
4125         /* after that create the register mask
4126         for each of the instruction */
4127         createRegMask (ebbs, count);
4128
4129         /* redo that offsets for stacked automatic variables */
4130         redoStackOffsets ();
4131
4132         if (options.dump_rassgn)
4133                 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4134
4135         /* now get back the chain */
4136         ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4137
4138         debugLog ("ebbs after optimizing:\n");
4139         dumpEbbsToDebug (ebbs, count);
4140
4141
4142         genpic14Code (ic);
4143
4144         /* free up any _G.stackSpil locations allocated */
4145         applyToSet (_G.stackSpil, deallocStackSpil);
4146         _G.slocNum = 0;
4147         setToNull ((void *) &_G.stackSpil);
4148         setToNull ((void *) &_G.spiltSet);
4149         /* mark all registers as free */
4150         //pic14_freeAllRegs ();
4151
4152         debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");
4153         debugLogClose ();
4154         return;
4155 }