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