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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->liveFrom == ic->seq &&    /* does not start before here */
2070                                 result->regType == sym->regType &&      /* same register types */
2071                                 result->regType == sym->regType &&      /* same register types */
2072                                 result->nRegs &&        /* which needs registers */
2073                                 !result->isspilt &&     /* and does not already have them */
2074                                 !result->remat &&
2075                                 !bitVectBitValue (_G.regAssigned, result->key) &&
2076                                 /* the number of free regs + number of regs in this LR
2077                                 can accomodate the what result Needs */
2078                                 ((nfreeRegsType (result->regType) +
2079                                 sym->nRegs) >= result->nRegs)
2080                                 )
2081                         {
2082
2083                                 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2084                                         if (i < sym->nRegs)
2085                                                 result->regs[i] = sym->regs[i];
2086                                         else
2087                                                 result->regs[i] = getRegGpr (ic, ebp, result);
2088
2089                                         _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2090
2091                         }
2092
2093                         /* free the remaining */
2094                         for (; i < sym->nRegs; i++)
2095                         {
2096                                 if (psym)
2097                                 {
2098                                         if (!symHasReg (psym, sym->regs[i]))
2099                                                 freeReg (sym->regs[i]);
2100                                 }
2101                                 else
2102                                         freeReg (sym->regs[i]);
2103                         }
2104                 }
2105         }
2106 }
2107
2108
2109 /*-----------------------------------------------------------------*/
2110 /* reassignLR - reassign this to registers                         */
2111 /*-----------------------------------------------------------------*/
2112 static void
2113 reassignLR (operand * op)
2114 {
2115         symbol *sym = OP_SYMBOL (op);
2116         int i;
2117
2118         debugLog ("%s\n", __FUNCTION__);
2119         /* not spilt any more */
2120         sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2121         bitVectUnSetBit (_G.spiltSet, sym->key);
2122
2123         _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2124
2125         _G.blockSpil--;
2126
2127         for (i = 0; i < sym->nRegs; i++)
2128                 sym->regs[i]->isFree = 0;
2129 }
2130
2131 /*-----------------------------------------------------------------*/
2132 /* willCauseSpill - determines if allocating will cause a spill    */
2133 /*-----------------------------------------------------------------*/
2134 static int
2135 willCauseSpill (int nr, int rt)
2136 {
2137         debugLog ("%s\n", __FUNCTION__);
2138         /* first check if there are any avlb registers
2139         of te type required */
2140         if (rt == REG_PTR)
2141         {
2142         /* special case for pointer type
2143         if pointer type not avlb then
2144                 check for type gpr */
2145                 if (nFreeRegs (rt) >= nr)
2146                         return 0;
2147                 if (nFreeRegs (REG_GPR) >= nr)
2148                         return 0;
2149         }
2150         else
2151         {
2152                 if (pic14_ptrRegReq)
2153                 {
2154                         if (nFreeRegs (rt) >= nr)
2155                                 return 0;
2156                 }
2157                 else
2158                 {
2159                         if (nFreeRegs (REG_PTR) +
2160                                 nFreeRegs (REG_GPR) >= nr)
2161                                 return 0;
2162                 }
2163         }
2164
2165         debugLog (" ... yep it will (cause a spill)\n");
2166         /* it will cause a spil */
2167         return 1;
2168 }
2169
2170 /*-----------------------------------------------------------------*/
2171 /* positionRegs - the allocator can allocate same registers to res- */
2172 /* ult and operand, if this happens make sure they are in the same */
2173 /* position as the operand otherwise chaos results                 */
2174 /*-----------------------------------------------------------------*/
2175 static void
2176 positionRegs (symbol * result, symbol * opsym, int lineno)
2177 {
2178         int count = min (result->nRegs, opsym->nRegs);
2179         int i, j = 0, shared = 0;
2180
2181         debugLog ("%s\n", __FUNCTION__);
2182         /* if the result has been spilt then cannot share */
2183         if (opsym->isspilt)
2184                 return;
2185 again:
2186         shared = 0;
2187         /* first make sure that they actually share */
2188         for (i = 0; i < count; i++)
2189         {
2190                 for (j = 0; j < count; j++)
2191                 {
2192                         if (result->regs[i] == opsym->regs[j] && i != j)
2193                         {
2194                                 shared = 1;
2195                                 goto xchgPositions;
2196                         }
2197                 }
2198         }
2199 xchgPositions:
2200         if (shared)
2201         {
2202                 regs *tmp = result->regs[i];
2203                 result->regs[i] = result->regs[j];
2204                 result->regs[j] = tmp;
2205                 goto again;
2206         }
2207 }
2208
2209 /*------------------------------------------------------------------*/
2210 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2211 /* it should either have registers or have beed spilled. Otherwise, */
2212 /* there was an uninitialized variable, so just spill this to get   */
2213 /* the operand in a valid state.                                    */
2214 /*------------------------------------------------------------------*/
2215 static void
2216 verifyRegsAssigned (operand *op, iCode * ic)
2217 {
2218   symbol * sym;
2219
2220   if (!op) return;
2221   if (!IS_ITEMP (op)) return;
2222
2223   sym = OP_SYMBOL (op);
2224   if (sym->isspilt) return;
2225   if (!sym->nRegs) return;
2226   if (sym->regs[0]) return;
2227
2228   werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2229             sym->prereqv ? sym->prereqv->name : sym->name);
2230   spillThis (sym);
2231 }
2232
2233
2234 /*-----------------------------------------------------------------*/
2235 /* serialRegAssign - serially allocate registers to the variables  */
2236 /*-----------------------------------------------------------------*/
2237 static void
2238 serialRegAssign (eBBlock ** ebbs, int count)
2239 {
2240         int i;
2241
2242         debugLog ("%s\n", __FUNCTION__);
2243         /* for all blocks */
2244         for (i = 0; i < count; i++)
2245         {
2246
2247                 iCode *ic;
2248
2249                 if (ebbs[i]->noPath &&
2250                         (ebbs[i]->entryLabel != entryLabel &&
2251                         ebbs[i]->entryLabel != returnLabel))
2252                         continue;
2253
2254                 /* of all instructions do */
2255                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2256                 {
2257
2258                         debugLog ("  op: %s\n", decodeOp (ic->op));
2259
2260                         /* if this is an ipop that means some live
2261                         range will have to be assigned again */
2262                         if (ic->op == IPOP)
2263                                 reassignLR (IC_LEFT (ic));
2264
2265                         /* if result is present && is a true symbol */
2266                         if (IC_RESULT (ic) && ic->op != IFX &&
2267                                 IS_TRUE_SYMOP (IC_RESULT (ic)))
2268                                 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2269
2270                                 /* take away registers from live
2271                         ranges that end at this instruction */
2272                         deassignLRs (ic, ebbs[i]);
2273
2274                         /* some don't need registers */
2275                         if (SKIP_IC2 (ic) ||
2276                                 ic->op == JUMPTABLE ||
2277                                 ic->op == IFX ||
2278                                 ic->op == IPUSH ||
2279                                 ic->op == IPOP ||
2280                                 (IC_RESULT (ic) && POINTER_SET (ic)))
2281                                 continue;
2282
2283                                 /* now we need to allocate registers
2284                         only for the result */
2285                         if (IC_RESULT (ic))
2286                         {
2287                                 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2288                                 bitVect *spillable;
2289                                 int willCS;
2290                                 int j;
2291                                 int ptrRegSet = 0;
2292
2293                                 /* if it does not need or is spilt
2294                                 or is already assigned to registers
2295                                 or will not live beyond this instructions */
2296                                 if (!sym->nRegs ||
2297                                         sym->isspilt ||
2298                                         bitVectBitValue (_G.regAssigned, sym->key) ||
2299                                         sym->liveTo <= ic->seq)
2300                                         continue;
2301
2302                                         /* if some liverange has been spilt at the block level
2303                                         and this one live beyond this block then spil this
2304                                 to be safe */
2305                                 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2306                                 {
2307                                         spillThis (sym);
2308                                         continue;
2309                                 }
2310                                 /* if trying to allocate this will cause
2311                                 a spill and there is nothing to spill
2312                                 or this one is rematerializable then
2313                                 spill this one */
2314                                 willCS = willCauseSpill (sym->nRegs, sym->regType);
2315                                 spillable = computeSpillable (ic);
2316                                 if (sym->remat ||
2317                                         (willCS && bitVectIsZero (spillable)))
2318                                 {
2319
2320                                         spillThis (sym);
2321                                         continue;
2322
2323                                 }
2324
2325                                 /* If the live range preceeds the point of definition
2326                                    then ideally we must take into account registers that
2327                                    have been allocated after sym->liveFrom but freed
2328                                    before ic->seq. This is complicated, so spill this
2329                                    symbol instead and let fillGaps handle the allocation. */
2330                                 if (sym->liveFrom < ic->seq)
2331                                 {
2332                                         spillThis (sym);
2333                                         continue;
2334                                 }
2335
2336                                 /* if it has a spillocation & is used less than
2337                                 all other live ranges then spill this */
2338                                 if (willCS) {
2339                                         if (sym->usl.spillLoc) {
2340                                                 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2341                                                         allLRs, ebbs[i], ic));
2342                                                 if (leastUsed && leastUsed->used > sym->used) {
2343                                                         spillThis (sym);
2344                                                         continue;
2345                                                 }
2346                                         } else {
2347                                         /* if none of the liveRanges have a spillLocation then better
2348                                                 to spill this one than anything else already assigned to registers */
2349                                                 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2350                                                         /* if this is local to this block then we might find a block spil */
2351                                                         if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2352                                                                 spillThis (sym);
2353                                                                 continue;
2354                                                         }
2355                                                 }
2356                                         }
2357                                 }
2358
2359                                 if (ic->op == RECEIVE)
2360                                         debugLog ("When I get clever, I'll optimize the receive logic\n");
2361
2362                                         /* if we need ptr regs for the right side
2363                                 then mark it */
2364                                 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2365                                         <= (unsigned) PTRSIZE)
2366                                 {
2367                                         pic14_ptrRegReq++;
2368                                         ptrRegSet = 1;
2369                                 }
2370                                 /* else we assign registers to it */
2371                                 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2372
2373                                 debugLog ("  %d - \n", __LINE__);
2374                                 if(debugF)
2375                                         bitVectDebugOn(_G.regAssigned, debugF);
2376                                 for (j = 0; j < sym->nRegs; j++)
2377                                 {
2378                                         if (sym->regType == REG_PTR)
2379                                                 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2380                                         else
2381                                                 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2382
2383                                                 /* if the allocation failed which means
2384                                         this was spilt then break */
2385                                         if (!sym->regs[j])
2386                                                 break;
2387                                 }
2388                                 debugLog ("  %d - \n", __LINE__);
2389
2390                                 /* if it shares registers with operands make sure
2391                                 that they are in the same position */
2392                                 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2393                                         OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2394                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2395                                         OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2396                                 /* do the same for the right operand */
2397                                 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2398                                         OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2399                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2400                                         OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2401
2402                                 debugLog ("  %d - \n", __LINE__);
2403                                 if (ptrRegSet)
2404                                 {
2405                                         debugLog ("  %d - \n", __LINE__);
2406                                         pic14_ptrRegReq--;
2407                                         ptrRegSet = 0;
2408                                 }
2409
2410                 }
2411         }
2412         }
2413
2414     /* Check for and fix any problems with uninitialized operands */
2415     for (i = 0; i < count; i++)
2416       {
2417         iCode *ic;
2418
2419         if (ebbs[i]->noPath &&
2420             (ebbs[i]->entryLabel != entryLabel &&
2421              ebbs[i]->entryLabel != returnLabel))
2422             continue;
2423
2424         for (ic = ebbs[i]->sch; ic; ic = ic->next)
2425           {
2426             if (SKIP_IC2 (ic))
2427               continue;
2428
2429             if (ic->op == IFX)
2430               {
2431                 verifyRegsAssigned (IC_COND (ic), ic);
2432                 continue;
2433               }
2434
2435             if (ic->op == JUMPTABLE)
2436               {
2437                 verifyRegsAssigned (IC_JTCOND (ic), ic);
2438                 continue;
2439               }
2440
2441             verifyRegsAssigned (IC_RESULT (ic), ic);
2442             verifyRegsAssigned (IC_LEFT (ic), ic);
2443             verifyRegsAssigned (IC_RIGHT (ic), ic);
2444           }
2445       }
2446
2447 }
2448
2449 /*-----------------------------------------------------------------*/
2450 /* rUmaskForOp :- returns register mask for an operand             */
2451 /*-----------------------------------------------------------------*/
2452 static bitVect *
2453 rUmaskForOp (operand * op)
2454 {
2455         bitVect *rumask;
2456         symbol *sym;
2457         int j;
2458
2459         debugLog ("%s\n", __FUNCTION__);
2460         /* only temporaries are assigned registers */
2461         if (!IS_ITEMP (op))
2462                 return NULL;
2463
2464         sym = OP_SYMBOL (op);
2465
2466         /* if spilt or no registers assigned to it
2467         then nothing */
2468         if (sym->isspilt || !sym->nRegs)
2469                 return NULL;
2470
2471         rumask = newBitVect (pic14_nRegs);
2472
2473         for (j = 0; j < sym->nRegs; j++)
2474         {
2475                 rumask = bitVectSetBit (rumask,
2476                         sym->regs[j]->rIdx);
2477         }
2478
2479         return rumask;
2480 }
2481
2482 /*-----------------------------------------------------------------*/
2483 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2484 /*-----------------------------------------------------------------*/
2485 static bitVect *
2486 regsUsedIniCode (iCode * ic)
2487 {
2488         bitVect *rmask = newBitVect (pic14_nRegs);
2489
2490         debugLog ("%s\n", __FUNCTION__);
2491         /* do the special cases first */
2492         if (ic->op == IFX)
2493         {
2494                 rmask = bitVectUnion (rmask,
2495                         rUmaskForOp (IC_COND (ic)));
2496                 goto ret;
2497         }
2498
2499         /* for the jumptable */
2500         if (ic->op == JUMPTABLE)
2501         {
2502                 rmask = bitVectUnion (rmask,
2503                         rUmaskForOp (IC_JTCOND (ic)));
2504
2505                 goto ret;
2506         }
2507
2508         /* of all other cases */
2509         if (IC_LEFT (ic))
2510                 rmask = bitVectUnion (rmask,
2511                 rUmaskForOp (IC_LEFT (ic)));
2512
2513
2514         if (IC_RIGHT (ic))
2515                 rmask = bitVectUnion (rmask,
2516                 rUmaskForOp (IC_RIGHT (ic)));
2517
2518         if (IC_RESULT (ic))
2519                 rmask = bitVectUnion (rmask,
2520                 rUmaskForOp (IC_RESULT (ic)));
2521
2522 ret:
2523         return rmask;
2524 }
2525
2526 /*-----------------------------------------------------------------*/
2527 /* createRegMask - for each instruction will determine the regsUsed */
2528 /*-----------------------------------------------------------------*/
2529 static void
2530 createRegMask (eBBlock ** ebbs, int count)
2531 {
2532         int i;
2533
2534         debugLog ("%s\n", __FUNCTION__);
2535         /* for all blocks */
2536         for (i = 0; i < count; i++)
2537         {
2538                 iCode *ic;
2539
2540                 if (ebbs[i]->noPath &&
2541                         (ebbs[i]->entryLabel != entryLabel &&
2542                         ebbs[i]->entryLabel != returnLabel))
2543                         continue;
2544
2545                 /* for all instructions */
2546                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2547                 {
2548
2549                         int j;
2550
2551                         if (SKIP_IC2 (ic) || !ic->rlive)
2552                                 continue;
2553
2554                                 /* first mark the registers used in this
2555                         instruction */
2556                         ic->rUsed = regsUsedIniCode (ic);
2557                         _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2558
2559                         /* now create the register mask for those
2560                         registers that are in use : this is a
2561                         super set of ic->rUsed */
2562                         ic->rMask = newBitVect (pic14_nRegs + 1);
2563
2564                         /* for all live Ranges alive at this point */
2565                         for (j = 1; j < ic->rlive->size; j++)
2566                         {
2567                                 symbol *sym;
2568                                 int k;
2569
2570                                 /* if not alive then continue */
2571                                 if (!bitVectBitValue (ic->rlive, j))
2572                                         continue;
2573
2574                                 /* find the live range we are interested in */
2575                                 if (!(sym = hTabItemWithKey (liveRanges, j)))
2576                                 {
2577                                         werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2578                                                 "createRegMask cannot find live range");
2579                                         exit (0);
2580                                 }
2581
2582                                 /* if no register assigned to it */
2583                                 if (!sym->nRegs || sym->isspilt)
2584                                         continue;
2585
2586                                 /* for all the registers allocated to it */
2587                                 for (k = 0; k < sym->nRegs; k++)
2588                                         if (sym->regs[k])
2589                                                 ic->rMask =
2590                                                 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2591                         }
2592                 }
2593         }
2594 }
2595
2596 /*-----------------------------------------------------------------*/
2597 /* rematStr - returns the rematerialized string for a remat var    */
2598 /*-----------------------------------------------------------------*/
2599 static symbol *
2600 rematStr (symbol * sym)
2601 {
2602         char *s = buffer;
2603         iCode *ic = sym->rematiCode;
2604         symbol *psym = NULL;
2605
2606         debugLog ("%s\n", __FUNCTION__);
2607
2608         //printf ("%s\n", s);
2609
2610         /* if plus or minus print the right hand side */
2611
2612         if (ic->op == '+' || ic->op == '-') {
2613
2614                 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2615
2616                 sprintf (s, "(%s %c 0x%04x)",
2617                         OP_SYMBOL (IC_LEFT (ric))->rname,
2618                         ic->op,
2619                         (int) operandLitValue (IC_RIGHT (ic)));
2620
2621
2622                 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2623
2624                 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2625                 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2626
2627                 return psym;
2628         }
2629
2630         sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2631         psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2632
2633         //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2634         return psym;
2635 }
2636
2637 #if 0
2638 /*-----------------------------------------------------------------*/
2639 /* rematStr - returns the rematerialized string for a remat var    */
2640 /*-----------------------------------------------------------------*/
2641 static char *
2642 rematStr (symbol * sym)
2643 {
2644         char *s = buffer;
2645         iCode *ic = sym->rematiCode;
2646
2647         debugLog ("%s\n", __FUNCTION__);
2648         while (1)
2649         {
2650
2651                 printf ("%s\n", s);
2652                 /* if plus or minus print the right hand side */
2653                 /*
2654                 if (ic->op == '+' || ic->op == '-') {
2655                 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2656                 ic->op );
2657                 s += strlen(s);
2658                 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2659                 continue ;
2660                 }
2661                 */
2662                 if (ic->op == '+' || ic->op == '-')
2663                 {
2664                         iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2665                         sprintf (s, "(%s %c 0x%04x)",
2666                                 OP_SYMBOL (IC_LEFT (ric))->rname,
2667                                 ic->op,
2668                                 (int) operandLitValue (IC_RIGHT (ic)));
2669
2670                         //s += strlen(s);
2671                         //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2672                         //continue ;
2673                         //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2674                         return buffer;
2675                 }
2676
2677                 /* we reached the end */
2678                 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2679                 break;
2680         }
2681
2682         printf ("%s\n", buffer);
2683         return buffer;
2684 }
2685 #endif
2686
2687 /*-----------------------------------------------------------------*/
2688 /* regTypeNum - computes the type & number of registers required   */
2689 /*-----------------------------------------------------------------*/
2690 static void
2691 regTypeNum ()
2692 {
2693         symbol *sym;
2694         int k;
2695         iCode *ic;
2696
2697         debugLog ("%s\n", __FUNCTION__);
2698         /* for each live range do */
2699         for (sym = hTabFirstItem (liveRanges, &k); sym;
2700         sym = hTabNextItem (liveRanges, &k)) {
2701
2702                 debugLog ("  %d - %s\n", __LINE__, sym->rname);
2703
2704                 /* if used zero times then no registers needed */
2705                 if ((sym->liveTo - sym->liveFrom) == 0)
2706                         continue;
2707
2708
2709                 /* if the live range is a temporary */
2710                 if (sym->isitmp) {
2711
2712                         debugLog ("  %d - itemp register\n", __LINE__);
2713
2714                         /* if the type is marked as a conditional */
2715                         if (sym->regType == REG_CND)
2716                                 continue;
2717
2718                                 /* if used in return only then we don't
2719                         need registers */
2720                         if (sym->accuse) {
2721                                 if (IS_AGGREGATE (sym->type) || sym->isptr)
2722                                         sym->type = aggrToPtr (sym->type, FALSE);
2723                                 debugLog ("  %d - no reg needed - accumulator used\n", __LINE__);
2724
2725                                 continue;
2726                         }
2727
2728                         if (sym->ruonly) {
2729                                 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2730                                 //  sym->type = aggrToPtr (sym->type, FALSE);
2731                                 debugLog ("  %d - used as a return\n", __LINE__);
2732
2733                                 //continue;
2734                         }
2735
2736                         /* if the symbol has only one definition &
2737                         that definition is a get_pointer and the
2738                         pointer we are getting is rematerializable and
2739                         in "data" space */
2740
2741                         if (bitVectnBitsOn (sym->defs) == 1 &&
2742                             (ic = hTabItemWithKey (iCodehTab,
2743                                                    bitVectFirstBit (sym->defs))) &&
2744                             POINTER_GET (ic) &&
2745                             !IS_BITVAR (sym->etype) &&
2746                             (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2747
2748                                 if (ptrPseudoSymSafe (sym, ic)) {
2749
2750                                         symbol *psym;
2751
2752                                         debugLog ("  %d - \n", __LINE__);
2753
2754                                         /* create a psuedo symbol & force a spil */
2755                                         //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2756                                         psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2757                                         psym->type = sym->type;
2758                                         psym->etype = sym->etype;
2759                                         psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2760                                         strcpy (psym->rname, psym->name);
2761                                         sym->isspilt = 1;
2762                                         sym->usl.spillLoc = psym;
2763                                         continue;
2764                                 }
2765
2766                                 /* if in data space or idata space then try to
2767                                 allocate pointer register */
2768
2769                         }
2770
2771                         /* if not then we require registers */
2772                         sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2773                                 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2774                         getSize (sym->type));
2775
2776
2777                         if(IS_PTR_CONST (sym->type)) {
2778                                 debugLog ("  %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2779                                 sym->nRegs = 2;
2780                         }
2781
2782                         if (sym->nRegs > 4) {
2783                                 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2784                                 printTypeChain (sym->type, stderr);
2785                                 fprintf (stderr, "\n");
2786                         }
2787
2788                         /* determine the type of register required */
2789                         if (sym->nRegs == 1 &&
2790                                 IS_PTR (sym->type) &&
2791                                 sym->uptr)
2792                                 sym->regType = REG_PTR;
2793                         else
2794                                 sym->regType = REG_GPR;
2795
2796
2797                         debugLog ("  reg name %s,  reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2798
2799                 }
2800                 else
2801                         /* for the first run we don't provide */
2802                         /* registers for true symbols we will */
2803                         /* see how things go                  */
2804                         sym->nRegs = 0;
2805   }
2806
2807 }
2808 DEFSETFUNC (markRegFree)
2809 {
2810         ((regs *)item)->isFree = 1;
2811
2812         return 0;
2813 }
2814
2815 DEFSETFUNC (deallocReg)
2816 {
2817         fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2818         ((regs *)item)->isFree = 1;
2819         ((regs *)item)->wasUsed = 0;
2820
2821         return 0;
2822 }
2823 /*-----------------------------------------------------------------*/
2824 /* freeAllRegs - mark all registers as free                        */
2825 /*-----------------------------------------------------------------*/
2826 void
2827 pic14_freeAllRegs ()
2828 {
2829         //  int i;
2830
2831         debugLog ("%s\n", __FUNCTION__);
2832
2833         applyToSet(dynAllocRegs,markRegFree);
2834         applyToSet(dynStackRegs,markRegFree);
2835
2836         /*
2837         for (i = 0; i < pic14_nRegs; i++)
2838         regspic14[i].isFree = 1;
2839         */
2840 }
2841
2842 /*-----------------------------------------------------------------*/
2843 /*-----------------------------------------------------------------*/
2844 void
2845 pic14_deallocateAllRegs ()
2846 {
2847         //  int i;
2848
2849         debugLog ("%s\n", __FUNCTION__);
2850
2851         applyToSet(dynAllocRegs,deallocReg);
2852
2853         /*
2854         for (i = 0; i < pic14_nRegs; i++) {
2855                 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2856                 regspic14[i].isFree = 1;
2857                 regspic14[i].wasUsed = 0;
2858                 }
2859         }
2860         */
2861 }
2862
2863
2864 /*-----------------------------------------------------------------*/
2865 /* deallocStackSpil - this will set the stack pointer back         */
2866 /*-----------------------------------------------------------------*/
2867 static
2868 DEFSETFUNC (deallocStackSpil)
2869 {
2870         symbol *sym = item;
2871
2872         debugLog ("%s\n", __FUNCTION__);
2873         deallocLocal (sym);
2874         return 0;
2875 }
2876
2877 /*-----------------------------------------------------------------*/
2878 /* farSpacePackable - returns the packable icode for far variables */
2879 /*-----------------------------------------------------------------*/
2880 static iCode *
2881 farSpacePackable (iCode * ic)
2882 {
2883         iCode *dic;
2884
2885         debugLog ("%s\n", __FUNCTION__);
2886         /* go thru till we find a definition for the
2887         symbol on the right */
2888         for (dic = ic->prev; dic; dic = dic->prev)
2889         {
2890
2891                 /* if the definition is a call then no */
2892                 if ((dic->op == CALL || dic->op == PCALL) &&
2893                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2894                 {
2895                         return NULL;
2896                 }
2897
2898                 /* if shift by unknown amount then not */
2899                 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2900                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2901                         return NULL;
2902
2903                 /* if pointer get and size > 1 */
2904                 if (POINTER_GET (dic) &&
2905                         getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2906                         return NULL;
2907
2908                 if (POINTER_SET (dic) &&
2909                         getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2910                         return NULL;
2911
2912                 /* if any three is a true symbol in far space */
2913                 if (IC_RESULT (dic) &&
2914                         IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2915                         isOperandInFarSpace (IC_RESULT (dic)))
2916                         return NULL;
2917
2918                 if (IC_RIGHT (dic) &&
2919                         IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2920                         isOperandInFarSpace (IC_RIGHT (dic)) &&
2921                         !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2922                         return NULL;
2923
2924                 if (IC_LEFT (dic) &&
2925                         IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2926                         isOperandInFarSpace (IC_LEFT (dic)) &&
2927                         !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2928                         return NULL;
2929
2930                 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2931                 {
2932                         if ((dic->op == LEFT_OP ||
2933                                 dic->op == RIGHT_OP ||
2934                                 dic->op == '-') &&
2935                                 IS_OP_LITERAL (IC_RIGHT (dic)))
2936                                 return NULL;
2937                         else
2938                                 return dic;
2939                 }
2940         }
2941
2942         return NULL;
2943 }
2944
2945 /*-----------------------------------------------------------------*/
2946 /* packRegsForAssign - register reduction for assignment           */
2947 /*-----------------------------------------------------------------*/
2948 static int
2949 packRegsForAssign (iCode * ic, eBBlock * ebp)
2950 {
2951
2952         iCode *dic, *sic;
2953
2954         debugLog ("%s\n", __FUNCTION__);
2955
2956         debugAopGet ("  result:", IC_RESULT (ic));
2957         debugAopGet ("  left:", IC_LEFT (ic));
2958         debugAopGet ("  right:", IC_RIGHT (ic));
2959
2960         /* if this is at an absolute address, then get the address. */
2961         if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2962                 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2963                         debugLog ("  %d - found config word declaration\n", __LINE__);
2964                         if(IS_VALOP(IC_RIGHT(ic))) {
2965                                 debugLog ("  setting config word to %x\n",
2966                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2967                                 assignConfigWordValue(  SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2968                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2969                         }
2970
2971                         /* remove the assignment from the iCode chain. */
2972
2973                         remiCodeFromeBBlock (ebp, ic);
2974                         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2975                         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2976
2977                         return 1;
2978
2979                 }
2980         }
2981
2982         if (!IS_ITEMP (IC_RESULT (ic))) {
2983                 allocDirReg(IC_RESULT (ic));
2984                 debugLog ("  %d - result is not temp\n", __LINE__);
2985         }
2986         /*
2987         if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2988         debugLog ("  %d - left is not temp, allocating\n", __LINE__);
2989         allocDirReg(IC_LEFT (ic));
2990         }
2991         */
2992
2993         if (!IS_ITEMP (IC_RIGHT (ic))) {
2994                 debugLog ("  %d - not packing - right is not temp\n", __LINE__);
2995
2996                 /* only pack if this is not a function pointer */
2997                 if (!IS_REF (IC_RIGHT (ic)))
2998                         allocDirReg(IC_RIGHT (ic));
2999                 return 0;
3000         }
3001
3002         if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
3003                 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
3004         {
3005                 debugLog ("  %d - not packing - right side fails \n", __LINE__);
3006                 return 0;
3007         }
3008
3009         /* if the true symbol is defined in far space or on stack
3010         then we should not since this will increase register pressure */
3011         if (isOperandInFarSpace (IC_RESULT (ic)))
3012         {
3013                 if ((dic = farSpacePackable (ic)))
3014                         goto pack;
3015                 else
3016                         return 0;
3017
3018         }
3019         /* find the definition of iTempNN scanning backwards if we find a
3020         a use of the true symbol before we find the definition then
3021         we cannot pack */
3022         for (dic = ic->prev; dic; dic = dic->prev)
3023         {
3024
3025         /* if there is a function call and this is
3026                 a parameter & not my parameter then don't pack it */
3027                 if ((dic->op == CALL || dic->op == PCALL) &&
3028                         (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
3029                         !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
3030                 {
3031                         debugLog ("  %d - \n", __LINE__);
3032                         dic = NULL;
3033                         break;
3034                 }
3035
3036                 if (SKIP_IC2 (dic))
3037                         continue;
3038
3039                 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3040                         IS_OP_VOLATILE (IC_RESULT (dic)))
3041                 {
3042                         debugLog ("  %d - dic is VOLATILE \n", __LINE__);
3043                         dic = NULL;
3044                         break;
3045                 }
3046
3047                 if (IS_SYMOP (IC_RESULT (dic)) &&
3048                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3049                 {
3050                         /* A previous result was assigned to the same register - we'll our definition */
3051                         debugLog ("  %d - dic result key == ic right key -- pointer set=%c\n",
3052                                 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3053                         if (POINTER_SET (dic))
3054                                 dic = NULL;
3055
3056                         break;
3057                 }
3058
3059                 if (IS_SYMOP (IC_RIGHT (dic)) &&
3060                         (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3061                         IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3062                 {
3063                         debugLog ("  %d - dic right key == ic rightor result key\n", __LINE__);
3064                         dic = NULL;
3065                         break;
3066                 }
3067
3068                 if (IS_SYMOP (IC_LEFT (dic)) &&
3069                         (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3070                         IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3071                 {
3072                         debugLog ("  %d - dic left key == ic rightor result key\n", __LINE__);
3073                         dic = NULL;
3074                         break;
3075                 }
3076
3077                 if (POINTER_SET (dic) &&
3078                         IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3079                 {
3080                         debugLog ("  %d - dic result key == ic result key -- pointer set=Y\n",
3081                                 __LINE__);
3082                         dic = NULL;
3083                         break;
3084                 }
3085         }
3086
3087         if (!dic)
3088                 return 0;                       /* did not find */
3089
3090                                                         /* if the result is on stack or iaccess then it must be
3091         the same atleast one of the operands */
3092         if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3093                 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3094         {
3095
3096         /* the operation has only one symbol
3097                 operator then we can pack */
3098                 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3099                         (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3100                         goto pack;
3101
3102                 if (!((IC_LEFT (dic) &&
3103                         IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3104                         (IC_RIGHT (dic) &&
3105                         IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3106                         return 0;
3107         }
3108 pack:
3109         debugLog ("  packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3110         debugLog ("  replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3111         /* found the definition */
3112         /* replace the result with the result of */
3113         /* this assignment and remove this assignment */
3114         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3115         IC_RESULT (dic) = IC_RESULT (ic);
3116
3117         if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3118         {
3119                 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3120         }
3121         /* delete from liverange table also
3122         delete from all the points inbetween and the new
3123         one */
3124         for (sic = dic; sic != ic; sic = sic->next)
3125         {
3126                 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3127                 if (IS_ITEMP (IC_RESULT (dic)))
3128                         bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3129         }
3130
3131         remiCodeFromeBBlock (ebp, ic);
3132         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3133         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3134         OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3135         return 1;
3136
3137
3138 }
3139
3140 /*-----------------------------------------------------------------*/
3141 /* findAssignToSym : scanning backwards looks for first assig found */
3142 /*-----------------------------------------------------------------*/
3143 static iCode *
3144 findAssignToSym (operand * op, iCode * ic)
3145 {
3146         iCode *dic;
3147
3148         debugLog ("%s\n", __FUNCTION__);
3149         for (dic = ic->prev; dic; dic = dic->prev)
3150         {
3151
3152                 /* if definition by assignment */
3153                 if (dic->op == '=' &&
3154                         !POINTER_SET (dic) &&
3155                         IC_RESULT (dic)->key == op->key
3156                         /*          &&  IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3157                         )
3158                 {
3159
3160                         /* we are interested only if defined in far space */
3161                         /* or in stack space in case of + & - */
3162
3163                         /* if assigned to a non-symbol then return
3164                         true */
3165                         if (!IS_SYMOP (IC_RIGHT (dic)))
3166                                 break;
3167
3168                                 /* if the symbol is in far space then
3169                         we should not */
3170                         if (isOperandInFarSpace (IC_RIGHT (dic)))
3171                                 return NULL;
3172
3173                                 /* for + & - operations make sure that
3174                                 if it is on the stack it is the same
3175                         as one of the three operands */
3176                         if ((ic->op == '+' || ic->op == '-') &&
3177                                 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3178                         {
3179
3180                                 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3181                                         IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3182                                         IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3183                                         return NULL;
3184                         }
3185
3186                         break;
3187
3188                 }
3189
3190                 /* if we find an usage then we cannot delete it */
3191                 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3192                         return NULL;
3193
3194                 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3195                         return NULL;
3196
3197                 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3198                         return NULL;
3199         }
3200
3201         /* now make sure that the right side of dic
3202         is not defined between ic & dic */
3203         if (dic)
3204         {
3205                 iCode *sic = dic->next;
3206
3207                 for (; sic != ic; sic = sic->next)
3208                         if (IC_RESULT (sic) &&
3209                                 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3210                                 return NULL;
3211         }
3212
3213         return dic;
3214
3215
3216 }
3217
3218 /*-----------------------------------------------------------------*/
3219 /* packRegsForSupport :- reduce some registers for support calls   */
3220 /*-----------------------------------------------------------------*/
3221 static int
3222 packRegsForSupport (iCode * ic, eBBlock * ebp)
3223 {
3224         int change = 0;
3225
3226         debugLog ("%s\n", __FUNCTION__);
3227         /* for the left & right operand :- look to see if the
3228         left was assigned a true symbol in far space in that
3229         case replace them */
3230         if (IS_ITEMP (IC_LEFT (ic)) &&
3231                 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3232         {
3233                 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3234                 iCode *sic;
3235
3236                 if (!dic)
3237                         goto right;
3238
3239                 debugAopGet ("removing left:", IC_LEFT (ic));
3240
3241                 /* found it we need to remove it from the
3242                 block */
3243                 for (sic = dic; sic != ic; sic = sic->next)
3244                         bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3245
3246                 IC_LEFT (ic)->operand.symOperand =
3247                         IC_RIGHT (dic)->operand.symOperand;
3248                 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3249                 remiCodeFromeBBlock (ebp, dic);
3250                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3251                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3252                 change++;
3253         }
3254
3255         /* do the same for the right operand */
3256 right:
3257         if (!change &&
3258                 IS_ITEMP (IC_RIGHT (ic)) &&
3259                 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3260         {
3261                 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3262                 iCode *sic;
3263
3264                 if (!dic)
3265                         return change;
3266
3267                         /* if this is a subtraction & the result
3268                 is a true symbol in far space then don't pack */
3269                 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3270                 {
3271                         sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3272                         if (IN_FARSPACE (SPEC_OCLS (etype)))
3273                                 return change;
3274                 }
3275
3276                 debugAopGet ("removing right:", IC_RIGHT (ic));
3277
3278                 /* found it we need to remove it from the
3279                 block */
3280                 for (sic = dic; sic != ic; sic = sic->next)
3281                         bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3282
3283                 IC_RIGHT (ic)->operand.symOperand =
3284                         IC_RIGHT (dic)->operand.symOperand;
3285                 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3286
3287                 remiCodeFromeBBlock (ebp, dic);
3288                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3289                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3290                 change++;
3291         }
3292
3293         return change;
3294 }
3295
3296 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3297
3298
3299 /*-----------------------------------------------------------------*/
3300 /* packRegsForOneuse : - will reduce some registers for single Use */
3301 /*-----------------------------------------------------------------*/
3302 static iCode *
3303 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3304 {
3305         bitVect *uses;
3306         iCode *dic, *sic;
3307
3308         debugLog ("%s\n", __FUNCTION__);
3309         /* if returning a literal then do nothing */
3310         if (!IS_SYMOP (op))
3311                 return NULL;
3312
3313                 /* only upto 2 bytes since we cannot predict
3314         the usage of b, & acc */
3315         if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3316                 ic->op != RETURN &&
3317                 ic->op != SEND)
3318                 return NULL;
3319
3320                 /* this routine will mark the a symbol as used in one
3321                 instruction use only && if the definition is local
3322                 (ie. within the basic block) && has only one definition &&
3323                 that definition is either a return value from a
3324                 function or does not contain any variables in
3325         far space */
3326         uses = bitVectCopy (OP_USES (op));
3327         bitVectUnSetBit (uses, ic->key);        /* take away this iCode */
3328         if (!bitVectIsZero (uses))      /* has other uses */
3329                 return NULL;
3330
3331         /* if it has only one defintion */
3332         if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3333                 return NULL;            /* has more than one definition */
3334
3335         /* get that definition */
3336         if (!(dic =
3337                 hTabItemWithKey (iCodehTab,
3338                 bitVectFirstBit (OP_DEFS (op)))))
3339                 return NULL;
3340
3341         /* found the definition now check if it is local */
3342         if (dic->seq < ebp->fSeq ||
3343                 dic->seq > ebp->lSeq)
3344                 return NULL;            /* non-local */
3345
3346                                                         /* now check if it is the return from
3347         a function call */
3348         if (dic->op == CALL || dic->op == PCALL)
3349         {
3350                 if (ic->op != SEND && ic->op != RETURN &&
3351                         !POINTER_SET(ic) && !POINTER_GET(ic))
3352                 {
3353                         OP_SYMBOL (op)->ruonly = 1;
3354                         return dic;
3355                 }
3356                 dic = dic->next;
3357         }
3358
3359
3360         /* otherwise check that the definition does
3361         not contain any symbols in far space */
3362         if (isOperandInFarSpace (IC_LEFT (dic)) ||
3363                 isOperandInFarSpace (IC_RIGHT (dic)) ||
3364                 IS_OP_RUONLY (IC_LEFT (ic)) ||
3365                 IS_OP_RUONLY (IC_RIGHT (ic)))
3366         {
3367                 return NULL;
3368         }
3369
3370         /* if pointer set then make sure the pointer
3371         is one byte */
3372         if (POINTER_SET (dic) &&
3373                 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3374                 return NULL;
3375
3376         if (POINTER_GET (dic) &&
3377                 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3378                 return NULL;
3379
3380         sic = dic;
3381
3382         /* also make sure the intervenening instructions
3383         don't have any thing in far space */
3384         for (dic = dic->next; dic && dic != ic; dic = dic->next)
3385         {
3386
3387                 /* if there is an intervening function call then no */
3388                 if (dic->op == CALL || dic->op == PCALL)
3389                         return NULL;
3390                         /* if pointer set then make sure the pointer
3391                 is one byte */
3392                 if (POINTER_SET (dic) &&
3393                         !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3394                         return NULL;
3395
3396                 if (POINTER_GET (dic) &&
3397                         !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3398                         return NULL;
3399
3400                 /* if address of & the result is remat then okay */
3401                 if (dic->op == ADDRESS_OF &&
3402                         OP_SYMBOL (IC_RESULT (dic))->remat)
3403                         continue;
3404
3405                         /* if operand has size of three or more & this
3406                         operation is a '*','/' or '%' then 'b' may
3407                 cause a problem */
3408                 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3409                         getSize (operandType (op)) >= 3)
3410                         return NULL;
3411
3412                 /* if left or right or result is in far space */
3413                 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3414                         isOperandInFarSpace (IC_RIGHT (dic)) ||
3415                         isOperandInFarSpace (IC_RESULT (dic)) ||
3416                         IS_OP_RUONLY (IC_LEFT (dic)) ||
3417                         IS_OP_RUONLY (IC_RIGHT (dic)) ||
3418                         IS_OP_RUONLY (IC_RESULT (dic)))
3419                 {
3420                         return NULL;
3421                 }
3422         }
3423
3424         OP_SYMBOL (op)->ruonly = 1;
3425         return sic;
3426
3427 }
3428
3429 /*-----------------------------------------------------------------*/
3430 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN          */
3431 /*-----------------------------------------------------------------*/
3432 static bool
3433 isBitwiseOptimizable (iCode * ic)
3434 {
3435         sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3436         sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3437
3438         debugLog ("%s\n", __FUNCTION__);
3439         /* bitwise operations are considered optimizable
3440         under the following conditions (Jean-Louis VERN)
3441
3442           x & lit
3443           bit & bit
3444           bit & x
3445           bit ^ bit
3446           bit ^ x
3447           x   ^ lit
3448           x   | lit
3449           bit | bit
3450           bit | x
3451         */
3452         if (IS_LITERAL (rtype) ||
3453                 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3454                 return TRUE;
3455         else
3456                 return FALSE;
3457 }
3458
3459 /*-----------------------------------------------------------------*/
3460 /* packRegsForAccUse - pack registers for acc use                  */
3461 /*-----------------------------------------------------------------*/
3462 static void
3463 packRegsForAccUse (iCode * ic)
3464 {
3465         iCode *uic;
3466
3467         debugLog ("%s\n", __FUNCTION__);
3468
3469         /* if this is an aggregate, e.g. a one byte char array */
3470         if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3471                 return;
3472         }
3473         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3474
3475         /* if + or - then it has to be one byte result */
3476         if ((ic->op == '+' || ic->op == '-')
3477                 && getSize (operandType (IC_RESULT (ic))) > 1)
3478                 return;
3479
3480         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3481         /* if shift operation make sure right side is not a literal */
3482         if (ic->op == RIGHT_OP &&
3483                 (isOperandLiteral (IC_RIGHT (ic)) ||
3484                 getSize (operandType (IC_RESULT (ic))) > 1))
3485                 return;
3486
3487         if (ic->op == LEFT_OP &&
3488                 (isOperandLiteral (IC_RIGHT (ic)) ||
3489                 getSize (operandType (IC_RESULT (ic))) > 1))
3490                 return;
3491
3492         if (IS_BITWISE_OP (ic) &&
3493                 getSize (operandType (IC_RESULT (ic))) > 1)
3494                 return;
3495
3496
3497         /* has only one definition */
3498         if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3499                 return;
3500
3501         /* has only one use */
3502         if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3503                 return;
3504
3505         /* and the usage immediately follows this iCode */
3506         if (!(uic = hTabItemWithKey (iCodehTab,
3507                 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3508                 return;
3509
3510         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3511         if (ic->next != uic)
3512                 return;
3513
3514         /* if it is a conditional branch then we definitely can */
3515         if (uic->op == IFX)
3516                 goto accuse;
3517
3518         if (uic->op == JUMPTABLE)
3519                 return;
3520
3521                 /* if the usage is not is an assignment
3522         or an arithmetic / bitwise / shift operation then not */
3523         if (POINTER_SET (uic) &&
3524                 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3525                 return;
3526
3527         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3528         if (uic->op != '=' &&
3529                 !IS_ARITHMETIC_OP (uic) &&
3530                 !IS_BITWISE_OP (uic) &&
3531                 uic->op != LEFT_OP &&
3532                 uic->op != RIGHT_OP)
3533                 return;
3534
3535         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3536         /* if used in ^ operation then make sure right is not a
3537         literl */
3538         if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3539                 return;
3540
3541         /* if shift operation make sure right side is not a literal */
3542         if (uic->op == RIGHT_OP &&
3543                 (isOperandLiteral (IC_RIGHT (uic)) ||
3544                 getSize (operandType (IC_RESULT (uic))) > 1))
3545                 return;
3546
3547         if (uic->op == LEFT_OP &&
3548                 (isOperandLiteral (IC_RIGHT (uic)) ||
3549                 getSize (operandType (IC_RESULT (uic))) > 1))
3550                 return;
3551
3552                 /* make sure that the result of this icode is not on the
3553         stack, since acc is used to compute stack offset */
3554         if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3555                 OP_SYMBOL (IC_RESULT (uic))->onStack)
3556                 return;
3557
3558         /* if either one of them in far space then we cannot */
3559         if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3560                 isOperandInFarSpace (IC_LEFT (uic))) ||
3561                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3562                 isOperandInFarSpace (IC_RIGHT (uic))))
3563                 return;
3564
3565         /* if the usage has only one operand then we can */
3566         if (IC_LEFT (uic) == NULL ||
3567                 IC_RIGHT (uic) == NULL)
3568                 goto accuse;
3569
3570                 /* make sure this is on the left side if not
3571         a '+' since '+' is commutative */
3572         if (ic->op != '+' &&
3573                 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3574                 return;
3575
3576         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3577         /* if one of them is a literal then we can */
3578         if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3579                 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic))))  &&
3580                 (getSize (operandType (IC_RESULT (uic))) <= 1))
3581         {
3582                 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3583                 return;
3584         }
3585
3586         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3587         /* if the other one is not on stack then we can */
3588         if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3589                 (IS_ITEMP (IC_RIGHT (uic)) ||
3590                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3591                 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3592                 goto accuse;
3593
3594         if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3595                 (IS_ITEMP (IC_LEFT (uic)) ||
3596                 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3597                 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3598                 goto accuse;
3599
3600         return;
3601
3602 accuse:
3603         debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3604         OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3605
3606
3607 }
3608
3609 /*-----------------------------------------------------------------*/
3610 /* packForPush - hueristics to reduce iCode for pushing            */
3611 /*-----------------------------------------------------------------*/
3612 static void
3613 packForReceive (iCode * ic, eBBlock * ebp)
3614 {
3615         iCode *dic;
3616
3617         debugLog ("%s\n", __FUNCTION__);
3618         debugAopGet ("  result:", IC_RESULT (ic));
3619         debugAopGet ("  left:", IC_LEFT (ic));
3620         debugAopGet ("  right:", IC_RIGHT (ic));
3621
3622         if (!ic->next)
3623                 return;
3624
3625         for (dic = ic->next; dic; dic = dic->next)
3626         {
3627
3628
3629
3630                 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3631                         debugLog ("    used on left\n");
3632                 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3633                         debugLog ("    used on right\n");
3634                 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3635                         debugLog ("    used on result\n");
3636
3637                 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3638                         (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3639                         return;
3640
3641         }
3642
3643         debugLog ("  hey we can remove this unnecessary assign\n");
3644 }
3645 /*-----------------------------------------------------------------*/
3646 /* packForPush - hueristics to reduce iCode for pushing            */
3647 /*-----------------------------------------------------------------*/
3648 static void
3649 packForPush (iCode * ic, eBBlock * ebp)
3650 {
3651         iCode *dic;
3652
3653         debugLog ("%s\n", __FUNCTION__);
3654         if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3655                 return;
3656
3657         /* must have only definition & one usage */
3658         if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3659                 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3660                 return;
3661
3662         /* find the definition */
3663         if (!(dic = hTabItemWithKey (iCodehTab,
3664                 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3665                 return;
3666
3667         if (dic->op != '=' || POINTER_SET (dic))
3668                 return;
3669
3670                 /* we now we know that it has one & only one def & use
3671         and the that the definition is an assignment */
3672         IC_LEFT (ic) = IC_RIGHT (dic);
3673
3674         remiCodeFromeBBlock (ebp, dic);
3675         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3676         hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3677 }
3678
3679 void printSymType(char * str, sym_link *sl)
3680 {
3681         debugLog ("    %s Symbol type: ",str);
3682         printTypeChain( sl, debugF);
3683         debugLog ("\n");
3684
3685 }
3686
3687 /*-----------------------------------------------------------------*/
3688 /* some debug code to print the symbol S_TYPE. Note that
3689 * the function checkSClass in src/SDCCsymt.c dinks with
3690 * the S_TYPE in ways the PIC port doesn't fully like...*/
3691 /*-----------------------------------------------------------------*/
3692 void isData(sym_link *sl)
3693 {
3694         FILE *of = stderr;
3695
3696         if(!sl)
3697                 return;
3698
3699         if(debugF)
3700                 of = debugF;
3701
3702         for ( ; sl; sl=sl->next) {
3703                 if(!IS_DECL(sl) ) {
3704                         switch (SPEC_SCLS(sl)) {
3705
3706                         case S_DATA: fprintf (of, "data "); break;
3707                         case S_XDATA: fprintf (of, "xdata "); break;
3708                         case S_SFR: fprintf (of, "sfr "); break;
3709                         case S_SBIT: fprintf (of, "sbit "); break;
3710                         case S_CODE: fprintf (of, "code "); break;
3711                         case S_IDATA: fprintf (of, "idata "); break;
3712                         case S_PDATA: fprintf (of, "pdata "); break;
3713                         case S_LITERAL: fprintf (of, "literal "); break;
3714                         case S_STACK: fprintf (of, "stack "); break;
3715                         case S_XSTACK: fprintf (of, "xstack "); break;
3716                         case S_BIT: fprintf (of, "bit "); break;
3717                         case S_EEPROM: fprintf (of, "eeprom "); break;
3718                         default: break;
3719                         }
3720
3721                 }
3722
3723         }
3724
3725 }
3726 /*-----------------------------------------------------------------*/
3727 /* packRegisters - does some transformations to reduce register    */
3728 /*                   pressure                                      */
3729 /*-----------------------------------------------------------------*/
3730 static void
3731 packRegisters (eBBlock * ebp)
3732 {
3733         iCode *ic;
3734         int change = 0;
3735
3736         debugLog ("%s\n", __FUNCTION__);
3737
3738         while (1) {
3739
3740                 change = 0;
3741
3742                 /* look for assignments of the form */
3743                 /* iTempNN = TRueSym (someoperation) SomeOperand */
3744                 /*       ....                       */
3745                 /* TrueSym := iTempNN:1             */
3746                 for (ic = ebp->sch; ic; ic = ic->next)
3747                 {
3748
3749                         /* find assignment of the form TrueSym := iTempNN:1 */
3750                         if (ic->op == '=' && !POINTER_SET (ic))
3751                                 change += packRegsForAssign (ic, ebp);
3752                         /* debug stuff */
3753                         if (ic->op == '=')
3754                         {
3755                                 if (POINTER_SET (ic))
3756                                         debugLog ("pointer is set\n");
3757                                 debugAopGet ("  result:", IC_RESULT (ic));
3758                                 debugAopGet ("  left:", IC_LEFT (ic));
3759                                 debugAopGet ("  right:", IC_RIGHT (ic));
3760                         }
3761
3762                 }
3763
3764                 if (!change)
3765                         break;
3766         }
3767
3768         for (ic = ebp->sch; ic; ic = ic->next) {
3769
3770                 if(IS_SYMOP ( IC_LEFT(ic))) {
3771                         sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3772
3773                         debugAopGet ("  left:", IC_LEFT (ic));
3774                         if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3775                                 debugLog ("    is a pointer\n");
3776
3777                         if(IS_OP_VOLATILE(IC_LEFT(ic)))
3778                                 debugLog ("    is volatile\n");
3779
3780                         isData(etype);
3781
3782                         printSymType("   ", OP_SYMBOL(IC_LEFT(ic))->type);
3783                 }
3784
3785                 if(IS_SYMOP ( IC_RIGHT(ic))) {
3786                         debugAopGet ("  right:", IC_RIGHT (ic));
3787                         printSymType("    ", OP_SYMBOL(IC_RIGHT(ic))->type);
3788                 }
3789
3790                 if(IS_SYMOP ( IC_RESULT(ic))) {
3791                         debugAopGet ("  result:", IC_RESULT (ic));
3792                         printSymType("     ", OP_SYMBOL(IC_RESULT(ic))->type);
3793                 }
3794
3795                 if (POINTER_SET (ic))
3796                         debugLog ("  %d - Pointer set\n", __LINE__);
3797
3798
3799                         /* if this is an itemp & result of a address of a true sym
3800                 then mark this as rematerialisable   */
3801                 if (ic->op == ADDRESS_OF &&
3802                         IS_ITEMP (IC_RESULT (ic)) &&
3803                         IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3804                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3805                         !OP_SYMBOL (IC_LEFT (ic))->onStack)
3806                 {
3807
3808                         debugLog ("  %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3809
3810                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3811                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3812                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3813
3814                 }
3815
3816                 /* if straight assignment then carry remat flag if
3817                 this is the only definition */
3818                 if (ic->op == '=' &&
3819                         !POINTER_SET (ic) &&
3820                         IS_SYMOP (IC_RIGHT (ic)) &&
3821                         OP_SYMBOL (IC_RIGHT (ic))->remat &&
3822                         bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3823                 {
3824                         debugLog ("  %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3825
3826                         OP_SYMBOL (IC_RESULT (ic))->remat =
3827                                 OP_SYMBOL (IC_RIGHT (ic))->remat;
3828                         OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3829                                 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3830                 }
3831
3832                 /* if this is a +/- operation with a rematerizable
3833                 then mark this as rematerializable as well */
3834                 if ((ic->op == '+' || ic->op == '-') &&
3835                         (IS_SYMOP (IC_LEFT (ic)) &&
3836                         IS_ITEMP (IC_RESULT (ic)) &&
3837                         OP_SYMBOL (IC_LEFT (ic))->remat &&
3838                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3839                         IS_OP_LITERAL (IC_RIGHT (ic))))
3840                 {
3841                         debugLog ("  %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3842                         //int i =
3843                         operandLitValue (IC_RIGHT (ic));
3844                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3845                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3846                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3847                 }
3848
3849                 /* mark the pointer usages */
3850                 if (POINTER_SET (ic))
3851                 {
3852                         OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3853                         debugLog ("  marking as a pointer (set) =>");
3854                         debugAopGet ("  result:", IC_RESULT (ic));
3855                 }
3856                 if (POINTER_GET (ic))
3857                 {
3858                         OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3859                         debugLog ("  marking as a pointer (get) =>");
3860                         debugAopGet ("  left:", IC_LEFT (ic));
3861                 }
3862
3863                 if (!SKIP_IC2 (ic))
3864                 {
3865                 /* if we are using a symbol on the stack
3866                         then we should say pic14_ptrRegReq */
3867                         if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3868                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3869                                 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3870                         else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3871                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3872                                 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3873                         else
3874                         {
3875                                 if (IS_SYMOP (IC_LEFT (ic)))
3876                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3877                                         OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3878                                 if (IS_SYMOP (IC_RIGHT (ic)))
3879                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3880                                         OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3881                                 if (IS_SYMOP (IC_RESULT (ic)))
3882                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3883                                         OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3884                         }
3885
3886                         debugLog ("  %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3887
3888                 }
3889
3890                 /* if the condition of an if instruction
3891                 is defined in the previous instruction then
3892                 mark the itemp as a conditional */
3893                 if ((IS_CONDITIONAL (ic) ||
3894                         ((ic->op == BITWISEAND ||
3895                         ic->op == '|' ||
3896                         ic->op == '^') &&
3897                         isBitwiseOptimizable (ic))) &&
3898                         ic->next && ic->next->op == IFX &&
3899                         isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3900                         OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3901                 {
3902
3903                         debugLog ("  %d\n", __LINE__);
3904                         OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3905                         continue;
3906                 }
3907
3908                 /* reduce for support function calls */
3909                 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3910                         packRegsForSupport (ic, ebp);
3911
3912                 /* if a parameter is passed, it's in W, so we may not
3913                 need to place a copy in a register */
3914                 if (ic->op == RECEIVE)
3915                         packForReceive (ic, ebp);
3916
3917                 /* some cases the redundant moves can
3918                 can be eliminated for return statements */
3919                 if ((ic->op == RETURN || ic->op == SEND) &&
3920                         !isOperandInFarSpace (IC_LEFT (ic)) &&
3921                         !options.model)
3922                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3923
3924                 /* if pointer set & left has a size more than
3925                 one and right is not in far space */
3926                 if (POINTER_SET (ic) &&
3927                         !isOperandInFarSpace (IC_RIGHT (ic)) &&
3928                         !OP_SYMBOL (IC_RESULT (ic))->remat &&
3929                         !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3930                         getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3931
3932                         packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3933
3934                 /* if pointer get */
3935                 if (POINTER_GET (ic) &&
3936                         !isOperandInFarSpace (IC_RESULT (ic)) &&
3937                         !OP_SYMBOL (IC_LEFT (ic))->remat &&
3938                         !IS_OP_RUONLY (IC_RESULT (ic)) &&
3939                         getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3940
3941                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3942
3943
3944                         /* if this is cast for intergral promotion then
3945                         check if only use of  the definition of the
3946                         operand being casted/ if yes then replace
3947                         the result of that arithmetic operation with
3948                 this result and get rid of the cast */
3949                 if (ic->op == CAST) {
3950
3951                         sym_link *fromType = operandType (IC_RIGHT (ic));
3952                         sym_link *toType = operandType (IC_LEFT (ic));
3953
3954                         debugLog ("  %d - casting\n", __LINE__);
3955
3956                         if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3957                                 getSize (fromType) != getSize (toType)) {
3958
3959
3960                                 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3961                                 if (dic) {
3962
3963                                         if (IS_ARITHMETIC_OP (dic)) {
3964
3965                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3966                                                 IC_RESULT (dic) = IC_RESULT (ic);
3967                                                 remiCodeFromeBBlock (ebp, ic);
3968                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3969                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3970                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3971                                                 ic = ic->prev;
3972                                         }  else
3973
3974                                                 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3975                                 }
3976                         } else {
3977
3978                         /* if the type from and type to are the same
3979                                 then if this is the only use then packit */
3980                                 if (compareType (operandType (IC_RIGHT (ic)),
3981                                         operandType (IC_LEFT (ic))) == 1) {
3982
3983                                         iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3984                                         if (dic) {
3985
3986                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3987                                                 IC_RESULT (dic) = IC_RESULT (ic);
3988                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3989                                                 remiCodeFromeBBlock (ebp, ic);
3990                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3991                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3992                                                 ic = ic->prev;
3993                                         }
3994                                 }
3995                         }
3996                 }
3997
3998                 /* pack for PUSH
3999                 iTempNN := (some variable in farspace) V1
4000                 push iTempNN ;
4001                 -------------
4002                 push V1
4003                 */
4004                 if (ic->op == IPUSH)
4005                 {
4006                         packForPush (ic, ebp);
4007                 }
4008
4009
4010                 /* pack registers for accumulator use, when the
4011                 result of an arithmetic or bit wise operation
4012                 has only one use, that use is immediately following
4013                 the defintion and the using iCode has only one
4014                 operand or has two operands but one is literal &
4015                 the result of that operation is not on stack then
4016                 we can leave the result of this operation in acc:b
4017                 combination */
4018                 if ((IS_ARITHMETIC_OP (ic)
4019
4020                         || IS_BITWISE_OP (ic)
4021
4022                         || ic->op == LEFT_OP || ic->op == RIGHT_OP
4023
4024                         ) &&
4025                         IS_ITEMP (IC_RESULT (ic)) &&
4026                         getSize (operandType (IC_RESULT (ic))) <= 2)
4027
4028                         packRegsForAccUse (ic);
4029
4030   }
4031 }
4032
4033 static void
4034 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4035 {
4036         int i;
4037
4038         if (!debug || !debugF)
4039                 return;
4040
4041         for (i = 0; i < count; i++)
4042         {
4043                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4044                 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4045                         ebbs[i]->entryLabel->name,
4046                         ebbs[i]->depth,
4047                         ebbs[i]->noPath,
4048                         ebbs[i]->isLastInLoop);
4049                 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4050                         ebbs[i]->dfnum,
4051                         ebbs[i]->bbnum,
4052                         ebbs[i]->fSeq,
4053                         ebbs[i]->lSeq);
4054                 fprintf (debugF, "visited %d : hasFcall = %d\n",
4055                         ebbs[i]->visited,
4056                         ebbs[i]->hasFcall);
4057
4058                 fprintf (debugF, "\ndefines bitVector :");
4059                 bitVectDebugOn (ebbs[i]->defSet, debugF);
4060                 fprintf (debugF, "\nlocal defines bitVector :");
4061                 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4062                 fprintf (debugF, "\npointers Set bitvector :");
4063                 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4064                 fprintf (debugF, "\nin pointers Set bitvector :");
4065                 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4066                 fprintf (debugF, "\ninDefs Set bitvector :");
4067                 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4068                 fprintf (debugF, "\noutDefs Set bitvector :");
4069                 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4070                 fprintf (debugF, "\nusesDefs Set bitvector :");
4071                 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4072                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4073                 printiCChain (ebbs[i]->sch, debugF);
4074         }
4075 }
4076 /*-----------------------------------------------------------------*/
4077 /* assignRegisters - assigns registers to each live range as need  */
4078 /*-----------------------------------------------------------------*/
4079 void
4080 pic14_assignRegisters (eBBlock ** ebbs, int count)
4081 {
4082         iCode *ic;
4083         int i;
4084
4085         debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4086         debugLog ("\nebbs before optimizing:\n");
4087         dumpEbbsToDebug (ebbs, count);
4088
4089         setToNull ((void *) &_G.funcrUsed);
4090         pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4091
4092
4093         /* change assignments this will remove some
4094         live ranges reducing some register pressure */
4095         for (i = 0; i < count; i++)
4096                 packRegisters (ebbs[i]);
4097
4098         {
4099                 regs *reg;
4100                 int hkey;
4101                 int i=0;
4102
4103                 debugLog("dir registers allocated so far:\n");
4104                 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4105
4106                 while(reg) {
4107                         debugLog("  -- #%d reg = %s  key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4108                         reg = hTabNextItem(dynDirectRegNames, &hkey);
4109                 }
4110
4111         }
4112
4113         if (options.dump_pack)
4114                 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4115
4116                 /* first determine for each live range the number of
4117         registers & the type of registers required for each */
4118         regTypeNum ();
4119
4120         /* and serially allocate registers */
4121         serialRegAssign (ebbs, count);
4122
4123         /* if stack was extended then tell the user */
4124         if (_G.stackExtend)
4125         {
4126                 /*      werror(W_TOOMANY_SPILS,"stack", */
4127                 /*             _G.stackExtend,currFunc->name,""); */
4128                 _G.stackExtend = 0;
4129         }
4130
4131         if (_G.dataExtend)
4132         {
4133                 /*      werror(W_TOOMANY_SPILS,"data space", */
4134                 /*             _G.dataExtend,currFunc->name,""); */
4135                 _G.dataExtend = 0;
4136         }
4137
4138         /* after that create the register mask
4139         for each of the instruction */
4140         createRegMask (ebbs, count);
4141
4142         /* redo that offsets for stacked automatic variables */
4143         redoStackOffsets ();
4144
4145         if (options.dump_rassgn)
4146                 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4147
4148         /* now get back the chain */
4149         ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4150
4151         debugLog ("ebbs after optimizing:\n");
4152         dumpEbbsToDebug (ebbs, count);
4153
4154
4155         genpic14Code (ic);
4156
4157         /* free up any _G.stackSpil locations allocated */
4158         applyToSet (_G.stackSpil, deallocStackSpil);
4159         _G.slocNum = 0;
4160         setToNull ((void *) &_G.stackSpil);
4161         setToNull ((void *) &_G.spiltSet);
4162         /* mark all registers as free */
4163         //pic14_freeAllRegs ();
4164
4165         debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");
4166         debugLogClose ();
4167         return;
4168 }