git.gag.com Git - fw/sdcc/blob - src/pic/ralloc.c

   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 &&
1804                     !isiCodeInFunctionCall (ic) &&
1805                     (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1806                 {
1807                         sym = leastUsedLR (selectS);
1808                         if (!sym->remat)
1809                         {
1810                                 sym->remainSpil = 1;
1811                                 _G.blockSpil++;
1812                         }
1813                         return sym;
1814                 }
1815         }
1816
1817         /* find live ranges with spillocation && not used as pointers */
1818         if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1819         {
1820
1821                 sym = leastUsedLR (selectS);
1822                 /* mark this as allocation required */
1823                 sym->usl.spillLoc->allocreq = 1;
1824                 return sym;
1825         }
1826
1827         /* find live ranges with spillocation */
1828         if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1829         {
1830
1831                 sym = leastUsedLR (selectS);
1832                 sym->usl.spillLoc->allocreq = 1;
1833                 return sym;
1834         }
1835
1836         /* couldn't find then we need to create a spil
1837         location on the stack , for which one? the least
1838         used ofcourse */
1839         if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1840         {
1841
1842                 /* return a created spil location */
1843                 sym = createStackSpil (leastUsedLR (selectS));
1844                 sym->usl.spillLoc->allocreq = 1;
1845                 return sym;
1846         }
1847
1848         /* this is an extreme situation we will spill
1849         this one : happens very rarely but it does happen */
1850         spillThis (forSym);
1851         return forSym;
1852
1853 }
1854
1855 /*-----------------------------------------------------------------*/
1856 /* spilSomething - spil some variable & mark registers as free     */
1857 /*-----------------------------------------------------------------*/
1858 static bool
1859 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1860 {
1861         symbol *ssym;
1862         int i;
1863
1864         debugLog ("%s\n", __FUNCTION__);
1865         /* get something we can spil */
1866         ssym = selectSpil (ic, ebp, forSym);
1867
1868         /* mark it as spilt */
1869         ssym->isspilt = 1;
1870         _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1871
1872         /* mark it as not register assigned &
1873         take it away from the set */
1874         bitVectUnSetBit (_G.regAssigned, ssym->key);
1875
1876         /* mark the registers as free */
1877         for (i = 0; i < ssym->nRegs; i++)
1878                 if (ssym->regs[i])
1879                         freeReg (ssym->regs[i]);
1880
1881                 /* if spilt on stack then free up r0 & r1
1882                 if they could have been assigned to as gprs */
1883                 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1884                 {
1885                         pic14_ptrRegReq++;
1886                         spillLRWithPtrReg (ssym);
1887                 }
1888
1889                 /* if this was a block level spil then insert push & pop
1890                 at the start & end of block respectively */
1891                 if (ssym->blockSpil)
1892                 {
1893                         iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1894                         /* add push to the start of the block */
1895                         addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1896                                 ebp->sch->next : ebp->sch));
1897                         nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1898                         /* add pop to the end of the block */
1899                         addiCodeToeBBlock (ebp, nic, NULL);
1900                 }
1901
1902                 /* if spilt because not used in the remainder of the
1903                 block then add a push before this instruction and
1904                 a pop at the end of the block */
1905                 if (ssym->remainSpil)
1906                 {
1907
1908                         iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1909                         /* add push just before this instruction */
1910                         addiCodeToeBBlock (ebp, nic, ic);
1911
1912                         nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1913                         /* add pop to the end of the block */
1914                         addiCodeToeBBlock (ebp, nic, NULL);
1915                 }
1916
1917                 if (ssym == forSym)
1918                         return FALSE;
1919                 else
1920                         return TRUE;
1921 }
1922
1923 /*-----------------------------------------------------------------*/
1924 /* getRegPtr - will try for PTR if not a GPR type if not spil      */
1925 /*-----------------------------------------------------------------*/
1926 static regs *
1927 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1928 {
1929         regs *reg;
1930         int j;
1931
1932         debugLog ("%s\n", __FUNCTION__);
1933 tryAgain:
1934         /* try for a ptr type */
1935         if ((reg = allocReg (REG_PTR)))
1936                 return reg;
1937
1938         /* try for gpr type */
1939         if ((reg = allocReg (REG_GPR)))
1940                 return reg;
1941
1942         /* we have to spil */
1943         if (!spilSomething (ic, ebp, sym))
1944                 return NULL;
1945
1946         /* make sure partially assigned registers aren't reused */
1947         for (j=0; j<=sym->nRegs; j++)
1948                 if (sym->regs[j])
1949                         sym->regs[j]->isFree = 0;
1950
1951                         /* this looks like an infinite loop but
1952                 in really selectSpil will abort  */
1953                 goto tryAgain;
1954 }
1955
1956 /*-----------------------------------------------------------------*/
1957 /* getRegGpr - will try for GPR if not spil                        */
1958 /*-----------------------------------------------------------------*/
1959 static regs *
1960 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1961 {
1962         regs *reg;
1963         int j;
1964
1965         debugLog ("%s\n", __FUNCTION__);
1966 tryAgain:
1967         /* try for gpr type */
1968         if ((reg = allocReg (REG_GPR)))
1969                 return reg;
1970
1971         if (!pic14_ptrRegReq)
1972                 if ((reg = allocReg (REG_PTR)))
1973                         return reg;
1974
1975                 /* we have to spil */
1976                 if (!spilSomething (ic, ebp, sym))
1977                         return NULL;
1978
1979                 /* make sure partially assigned registers aren't reused */
1980                 for (j=0; j<=sym->nRegs; j++)
1981                         if (sym->regs[j])
1982                                 sym->regs[j]->isFree = 0;
1983
1984                                 /* this looks like an infinite loop but
1985                         in really selectSpil will abort  */
1986                         goto tryAgain;
1987 }
1988
1989 /*-----------------------------------------------------------------*/
1990 /* symHasReg - symbol has a given register                         */
1991 /*-----------------------------------------------------------------*/
1992 static bool
1993 symHasReg (symbol * sym, regs * reg)
1994 {
1995         int i;
1996
1997         debugLog ("%s\n", __FUNCTION__);
1998         for (i = 0; i < sym->nRegs; i++)
1999                 if (sym->regs[i] == reg)
2000                         return TRUE;
2001
2002                 return FALSE;
2003 }
2004
2005 /*-----------------------------------------------------------------*/
2006 /* deassignLRs - check the live to and if they have registers & are */
2007 /*               not spilt then free up the registers              */
2008 /*-----------------------------------------------------------------*/
2009 static void
2010 deassignLRs (iCode * ic, eBBlock * ebp)
2011 {
2012         symbol *sym;
2013         int k;
2014         symbol *result;
2015
2016         debugLog ("%s\n", __FUNCTION__);
2017         for (sym = hTabFirstItem (liveRanges, &k); sym;
2018         sym = hTabNextItem (liveRanges, &k))
2019         {
2020
2021                 symbol *psym = NULL;
2022                 /* if it does not end here */
2023                 if (sym->liveTo > ic->seq)
2024                         continue;
2025
2026                         /* if it was spilt on stack then we can
2027                 mark the stack spil location as free */
2028                 if (sym->isspilt)
2029                 {
2030                         if (sym->stackSpil)
2031                         {
2032                                 sym->usl.spillLoc->isFree = 1;
2033                                 sym->stackSpil = 0;
2034                         }
2035                         continue;
2036                 }
2037
2038                 if (!bitVectBitValue (_G.regAssigned, sym->key))
2039                         continue;
2040
2041                         /* special case check if this is an IFX &
2042                         the privious one was a pop and the
2043                         previous one was not spilt then keep track
2044                 of the symbol */
2045                 if (ic->op == IFX && ic->prev &&
2046                         ic->prev->op == IPOP &&
2047                         !ic->prev->parmPush &&
2048                         !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
2049                         psym = OP_SYMBOL (IC_LEFT (ic->prev));
2050
2051                 if (sym->nRegs)
2052                 {
2053                         int i = 0;
2054
2055                         bitVectUnSetBit (_G.regAssigned, sym->key);
2056
2057                         /* if the result of this one needs registers
2058                         and does not have it then assign it right
2059                         away */
2060                         if (IC_RESULT (ic) &&
2061                                 !(SKIP_IC2 (ic) ||      /* not a special icode */
2062                                 ic->op == JUMPTABLE ||
2063                                 ic->op == IFX ||
2064                                 ic->op == IPUSH ||
2065                                 ic->op == IPOP ||
2066                                 ic->op == RETURN ||
2067                                 POINTER_SET (ic)) &&
2068                                 (result = OP_SYMBOL (IC_RESULT (ic))) &&        /* has a result */
2069                                 result->liveTo > ic->seq &&     /* and will live beyond this */
2070                                 result->liveTo <= ebp->lSeq &&  /* does not go beyond this block */
2071                                 result->liveFrom == ic->seq &&    /* does not start before here */
2072                                 result->regType == sym->regType &&      /* same register types */
2073                                 result->regType == sym->regType &&      /* same register types */
2074                                 result->nRegs &&        /* which needs registers */
2075                                 !result->isspilt &&     /* and does not already have them */
2076                                 !result->remat &&
2077                                 !bitVectBitValue (_G.regAssigned, result->key) &&
2078                                 /* the number of free regs + number of regs in this LR
2079                                 can accomodate the what result Needs */
2080                                 ((nfreeRegsType (result->regType) +
2081                                 sym->nRegs) >= result->nRegs)
2082                                 )
2083                         {
2084
2085                                 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2086                                         if (i < sym->nRegs)
2087                                                 result->regs[i] = sym->regs[i];
2088                                         else
2089                                                 result->regs[i] = getRegGpr (ic, ebp, result);
2090
2091                                         _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2092
2093                         }
2094
2095                         /* free the remaining */
2096                         for (; i < sym->nRegs; i++)
2097                         {
2098                                 if (psym)
2099                                 {
2100                                         if (!symHasReg (psym, sym->regs[i]))
2101                                                 freeReg (sym->regs[i]);
2102                                 }
2103                                 else
2104                                         freeReg (sym->regs[i]);
2105                         }
2106                 }
2107         }
2108 }
2109
2110
2111 /*-----------------------------------------------------------------*/
2112 /* reassignLR - reassign this to registers                         */
2113 /*-----------------------------------------------------------------*/
2114 static void
2115 reassignLR (operand * op)
2116 {
2117         symbol *sym = OP_SYMBOL (op);
2118         int i;
2119
2120         debugLog ("%s\n", __FUNCTION__);
2121         /* not spilt any more */
2122         sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2123         bitVectUnSetBit (_G.spiltSet, sym->key);
2124
2125         _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2126
2127         _G.blockSpil--;
2128
2129         for (i = 0; i < sym->nRegs; i++)
2130                 sym->regs[i]->isFree = 0;
2131 }
2132
2133 /*-----------------------------------------------------------------*/
2134 /* willCauseSpill - determines if allocating will cause a spill    */
2135 /*-----------------------------------------------------------------*/
2136 static int
2137 willCauseSpill (int nr, int rt)
2138 {
2139         debugLog ("%s\n", __FUNCTION__);
2140         /* first check if there are any avlb registers
2141         of te type required */
2142         if (rt == REG_PTR)
2143         {
2144         /* special case for pointer type
2145         if pointer type not avlb then
2146                 check for type gpr */
2147                 if (nFreeRegs (rt) >= nr)
2148                         return 0;
2149                 if (nFreeRegs (REG_GPR) >= nr)
2150                         return 0;
2151         }
2152         else
2153         {
2154                 if (pic14_ptrRegReq)
2155                 {
2156                         if (nFreeRegs (rt) >= nr)
2157                                 return 0;
2158                 }
2159                 else
2160                 {
2161                         if (nFreeRegs (REG_PTR) +
2162                                 nFreeRegs (REG_GPR) >= nr)
2163                                 return 0;
2164                 }
2165         }
2166
2167         debugLog (" ... yep it will (cause a spill)\n");
2168         /* it will cause a spil */
2169         return 1;
2170 }
2171
2172 /*-----------------------------------------------------------------*/
2173 /* positionRegs - the allocator can allocate same registers to res- */
2174 /* ult and operand, if this happens make sure they are in the same */
2175 /* position as the operand otherwise chaos results                 */
2176 /*-----------------------------------------------------------------*/
2177 static void
2178 positionRegs (symbol * result, symbol * opsym, int lineno)
2179 {
2180         int count = min (result->nRegs, opsym->nRegs);
2181         int i, j = 0, shared = 0;
2182
2183         debugLog ("%s\n", __FUNCTION__);
2184         /* if the result has been spilt then cannot share */
2185         if (opsym->isspilt)
2186                 return;
2187 again:
2188         shared = 0;
2189         /* first make sure that they actually share */
2190         for (i = 0; i < count; i++)
2191         {
2192                 for (j = 0; j < count; j++)
2193                 {
2194                         if (result->regs[i] == opsym->regs[j] && i != j)
2195                         {
2196                                 shared = 1;
2197                                 goto xchgPositions;
2198                         }
2199                 }
2200         }
2201 xchgPositions:
2202         if (shared)
2203         {
2204                 regs *tmp = result->regs[i];
2205                 result->regs[i] = result->regs[j];
2206                 result->regs[j] = tmp;
2207                 goto again;
2208         }
2209 }
2210
2211 /*------------------------------------------------------------------*/
2212 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2213 /* it should either have registers or have beed spilled. Otherwise, */
2214 /* there was an uninitialized variable, so just spill this to get   */
2215 /* the operand in a valid state.                                    */
2216 /*------------------------------------------------------------------*/
2217 static void
2218 verifyRegsAssigned (operand *op, iCode * ic)
2219 {
2220   symbol * sym;
2221
2222   if (!op) return;
2223   if (!IS_ITEMP (op)) return;
2224
2225   sym = OP_SYMBOL (op);
2226   if (sym->isspilt) return;
2227   if (!sym->nRegs) return;
2228   if (sym->regs[0]) return;
2229
2230   werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2231             sym->prereqv ? sym->prereqv->name : sym->name);
2232   spillThis (sym);
2233 }
2234
2235
2236 /*-----------------------------------------------------------------*/
2237 /* serialRegAssign - serially allocate registers to the variables  */
2238 /*-----------------------------------------------------------------*/
2239 static void
2240 serialRegAssign (eBBlock ** ebbs, int count)
2241 {
2242         int i;
2243
2244         debugLog ("%s\n", __FUNCTION__);
2245         /* for all blocks */
2246         for (i = 0; i < count; i++)
2247         {
2248
2249                 iCode *ic;
2250
2251                 if (ebbs[i]->noPath &&
2252                         (ebbs[i]->entryLabel != entryLabel &&
2253                         ebbs[i]->entryLabel != returnLabel))
2254                         continue;
2255
2256                 /* of all instructions do */
2257                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2258                 {
2259
2260                         debugLog ("  op: %s\n", decodeOp (ic->op));
2261
2262                         /* if this is an ipop that means some live
2263                         range will have to be assigned again */
2264                         if (ic->op == IPOP)
2265                                 reassignLR (IC_LEFT (ic));
2266
2267                         /* if result is present && is a true symbol */
2268                         if (IC_RESULT (ic) && ic->op != IFX &&
2269                                 IS_TRUE_SYMOP (IC_RESULT (ic)))
2270                                 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2271
2272                                 /* take away registers from live
2273                         ranges that end at this instruction */
2274                         deassignLRs (ic, ebbs[i]);
2275
2276                         /* some don't need registers */
2277                         if (SKIP_IC2 (ic) ||
2278                                 ic->op == JUMPTABLE ||
2279                                 ic->op == IFX ||
2280                                 ic->op == IPUSH ||
2281                                 ic->op == IPOP ||
2282                                 (IC_RESULT (ic) && POINTER_SET (ic)))
2283                                 continue;
2284
2285                                 /* now we need to allocate registers
2286                         only for the result */
2287                         if (IC_RESULT (ic))
2288                         {
2289                                 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2290                                 bitVect *spillable;
2291                                 int willCS;
2292                                 int j;
2293                                 int ptrRegSet = 0;
2294
2295                                 /* if it does not need or is spilt
2296                                 or is already assigned to registers
2297                                 or will not live beyond this instructions */
2298                                 if (!sym->nRegs ||
2299                                         sym->isspilt ||
2300                                         bitVectBitValue (_G.regAssigned, sym->key) ||
2301                                         sym->liveTo <= ic->seq)
2302                                         continue;
2303
2304                                         /* if some liverange has been spilt at the block level
2305                                         and this one live beyond this block then spil this
2306                                 to be safe */
2307                                 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2308                                 {
2309                                         spillThis (sym);
2310                                         continue;
2311                                 }
2312                                 /* if trying to allocate this will cause
2313                                 a spill and there is nothing to spill
2314                                 or this one is rematerializable then
2315                                 spill this one */
2316                                 willCS = willCauseSpill (sym->nRegs, sym->regType);
2317                                 spillable = computeSpillable (ic);
2318                                 if (sym->remat ||
2319                                         (willCS && bitVectIsZero (spillable)))
2320                                 {
2321
2322                                         spillThis (sym);
2323                                         continue;
2324
2325                                 }
2326
2327                                 /* If the live range preceeds the point of definition
2328                                    then ideally we must take into account registers that
2329                                    have been allocated after sym->liveFrom but freed
2330                                    before ic->seq. This is complicated, so spill this
2331                                    symbol instead and let fillGaps handle the allocation. */
2332                                 if (sym->liveFrom < ic->seq)
2333                                 {
2334                                         spillThis (sym);
2335                                         continue;
2336                                 }
2337
2338                                 /* if it has a spillocation & is used less than
2339                                 all other live ranges then spill this */
2340                                 if (willCS) {
2341                                         if (sym->usl.spillLoc) {
2342                                                 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2343                                                         allLRs, ebbs[i], ic));
2344                                                 if (leastUsed && leastUsed->used > sym->used) {
2345                                                         spillThis (sym);
2346                                                         continue;
2347                                                 }
2348                                         } else {
2349                                         /* if none of the liveRanges have a spillLocation then better
2350                                                 to spill this one than anything else already assigned to registers */
2351                                                 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2352                                                         /* if this is local to this block then we might find a block spil */
2353                                                         if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2354                                                                 spillThis (sym);
2355                                                                 continue;
2356                                                         }
2357                                                 }
2358                                         }
2359                                 }
2360
2361                                 if (ic->op == RECEIVE)
2362                                         debugLog ("When I get clever, I'll optimize the receive logic\n");
2363
2364                                         /* if we need ptr regs for the right side
2365                                 then mark it */
2366                                 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2367                                         <= (unsigned) PTRSIZE)
2368                                 {
2369                                         pic14_ptrRegReq++;
2370                                         ptrRegSet = 1;
2371                                 }
2372                                 /* else we assign registers to it */
2373                                 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2374
2375                                 debugLog ("  %d - \n", __LINE__);
2376                                 if(debugF)
2377                                         bitVectDebugOn(_G.regAssigned, debugF);
2378                                 for (j = 0; j < sym->nRegs; j++)
2379                                 {
2380                                         if (sym->regType == REG_PTR)
2381                                                 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2382                                         else
2383                                                 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2384
2385                                                 /* if the allocation failed which means
2386                                         this was spilt then break */
2387                                         if (!sym->regs[j])
2388                                                 break;
2389                                 }
2390                                 debugLog ("  %d - \n", __LINE__);
2391
2392                                 /* if it shares registers with operands make sure
2393                                 that they are in the same position */
2394                                 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2395                                         OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2396                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2397                                         OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2398                                 /* do the same for the right operand */
2399                                 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2400                                         OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2401                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2402                                         OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2403
2404                                 debugLog ("  %d - \n", __LINE__);
2405                                 if (ptrRegSet)
2406                                 {
2407                                         debugLog ("  %d - \n", __LINE__);
2408                                         pic14_ptrRegReq--;
2409                                         ptrRegSet = 0;
2410                                 }
2411
2412                 }
2413         }
2414         }
2415
2416     /* Check for and fix any problems with uninitialized operands */
2417     for (i = 0; i < count; i++)
2418       {
2419         iCode *ic;
2420
2421         if (ebbs[i]->noPath &&
2422             (ebbs[i]->entryLabel != entryLabel &&
2423              ebbs[i]->entryLabel != returnLabel))
2424             continue;
2425
2426         for (ic = ebbs[i]->sch; ic; ic = ic->next)
2427           {
2428             if (SKIP_IC2 (ic))
2429               continue;
2430
2431             if (ic->op == IFX)
2432               {
2433                 verifyRegsAssigned (IC_COND (ic), ic);
2434                 continue;
2435               }
2436
2437             if (ic->op == JUMPTABLE)
2438               {
2439                 verifyRegsAssigned (IC_JTCOND (ic), ic);
2440                 continue;
2441               }
2442
2443             verifyRegsAssigned (IC_RESULT (ic), ic);
2444             verifyRegsAssigned (IC_LEFT (ic), ic);
2445             verifyRegsAssigned (IC_RIGHT (ic), ic);
2446           }
2447       }
2448
2449 }
2450
2451 /*-----------------------------------------------------------------*/
2452 /* rUmaskForOp :- returns register mask for an operand             */
2453 /*-----------------------------------------------------------------*/
2454 static bitVect *
2455 rUmaskForOp (operand * op)
2456 {
2457         bitVect *rumask;
2458         symbol *sym;
2459         int j;
2460
2461         debugLog ("%s\n", __FUNCTION__);
2462         /* only temporaries are assigned registers */
2463         if (!IS_ITEMP (op))
2464                 return NULL;
2465
2466         sym = OP_SYMBOL (op);
2467
2468         /* if spilt or no registers assigned to it
2469         then nothing */
2470         if (sym->isspilt || !sym->nRegs)
2471                 return NULL;
2472
2473         rumask = newBitVect (pic14_nRegs);
2474
2475         for (j = 0; j < sym->nRegs; j++)
2476         {
2477                 rumask = bitVectSetBit (rumask,
2478                         sym->regs[j]->rIdx);
2479         }
2480
2481         return rumask;
2482 }
2483
2484 /*-----------------------------------------------------------------*/
2485 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2486 /*-----------------------------------------------------------------*/
2487 static bitVect *
2488 regsUsedIniCode (iCode * ic)
2489 {
2490         bitVect *rmask = newBitVect (pic14_nRegs);
2491
2492         debugLog ("%s\n", __FUNCTION__);
2493         /* do the special cases first */
2494         if (ic->op == IFX)
2495         {
2496                 rmask = bitVectUnion (rmask,
2497                         rUmaskForOp (IC_COND (ic)));
2498                 goto ret;
2499         }
2500
2501         /* for the jumptable */
2502         if (ic->op == JUMPTABLE)
2503         {
2504                 rmask = bitVectUnion (rmask,
2505                         rUmaskForOp (IC_JTCOND (ic)));
2506
2507                 goto ret;
2508         }
2509
2510         /* of all other cases */
2511         if (IC_LEFT (ic))
2512                 rmask = bitVectUnion (rmask,
2513                 rUmaskForOp (IC_LEFT (ic)));
2514
2515
2516         if (IC_RIGHT (ic))
2517                 rmask = bitVectUnion (rmask,
2518                 rUmaskForOp (IC_RIGHT (ic)));
2519
2520         if (IC_RESULT (ic))
2521                 rmask = bitVectUnion (rmask,
2522                 rUmaskForOp (IC_RESULT (ic)));
2523
2524 ret:
2525         return rmask;
2526 }
2527
2528 /*-----------------------------------------------------------------*/
2529 /* createRegMask - for each instruction will determine the regsUsed */
2530 /*-----------------------------------------------------------------*/
2531 static void
2532 createRegMask (eBBlock ** ebbs, int count)
2533 {
2534         int i;
2535
2536         debugLog ("%s\n", __FUNCTION__);
2537         /* for all blocks */
2538         for (i = 0; i < count; i++)
2539         {
2540                 iCode *ic;
2541
2542                 if (ebbs[i]->noPath &&
2543                         (ebbs[i]->entryLabel != entryLabel &&
2544                         ebbs[i]->entryLabel != returnLabel))
2545                         continue;
2546
2547                 /* for all instructions */
2548                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2549                 {
2550
2551                         int j;
2552
2553                         if (SKIP_IC2 (ic) || !ic->rlive)
2554                                 continue;
2555
2556                                 /* first mark the registers used in this
2557                         instruction */
2558                         ic->rUsed = regsUsedIniCode (ic);
2559                         _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2560
2561                         /* now create the register mask for those
2562                         registers that are in use : this is a
2563                         super set of ic->rUsed */
2564                         ic->rMask = newBitVect (pic14_nRegs + 1);
2565
2566                         /* for all live Ranges alive at this point */
2567                         for (j = 1; j < ic->rlive->size; j++)
2568                         {
2569                                 symbol *sym;
2570                                 int k;
2571
2572                                 /* if not alive then continue */
2573                                 if (!bitVectBitValue (ic->rlive, j))
2574                                         continue;
2575
2576                                 /* find the live range we are interested in */
2577                                 if (!(sym = hTabItemWithKey (liveRanges, j)))
2578                                 {
2579                                         werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2580                                                 "createRegMask cannot find live range");
2581                                         exit (0);
2582                                 }
2583
2584                                 /* if no register assigned to it */
2585                                 if (!sym->nRegs || sym->isspilt)
2586                                         continue;
2587
2588                                 /* for all the registers allocated to it */
2589                                 for (k = 0; k < sym->nRegs; k++)
2590                                         if (sym->regs[k])
2591                                                 ic->rMask =
2592                                                 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2593                         }
2594                 }
2595         }
2596 }
2597
2598 /*-----------------------------------------------------------------*/
2599 /* rematStr - returns the rematerialized string for a remat var    */
2600 /*-----------------------------------------------------------------*/
2601 static symbol *
2602 rematStr (symbol * sym)
2603 {
2604         char *s = buffer;
2605         iCode *ic = sym->rematiCode;
2606         symbol *psym = NULL;
2607
2608         debugLog ("%s\n", __FUNCTION__);
2609
2610         //printf ("%s\n", s);
2611
2612         /* if plus or minus print the right hand side */
2613
2614         if (ic->op == '+' || ic->op == '-') {
2615
2616                 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2617
2618                 sprintf (s, "(%s %c 0x%04x)",
2619                         OP_SYMBOL (IC_LEFT (ric))->rname,
2620                         ic->op,
2621                         (int) operandLitValue (IC_RIGHT (ic)));
2622
2623
2624                 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2625
2626                 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2627                 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2628
2629                 return psym;
2630         }
2631
2632         sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2633         psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2634
2635         //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2636         return psym;
2637 }
2638
2639 #if 0
2640 /*-----------------------------------------------------------------*/
2641 /* rematStr - returns the rematerialized string for a remat var    */
2642 /*-----------------------------------------------------------------*/
2643 static char *
2644 rematStr (symbol * sym)
2645 {
2646         char *s = buffer;
2647         iCode *ic = sym->rematiCode;
2648
2649         debugLog ("%s\n", __FUNCTION__);
2650         while (1)
2651         {
2652
2653                 printf ("%s\n", s);
2654                 /* if plus or minus print the right hand side */
2655                 /*
2656                 if (ic->op == '+' || ic->op == '-') {
2657                 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2658                 ic->op );
2659                 s += strlen(s);
2660                 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2661                 continue ;
2662                 }
2663                 */
2664                 if (ic->op == '+' || ic->op == '-')
2665                 {
2666                         iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2667                         sprintf (s, "(%s %c 0x%04x)",
2668                                 OP_SYMBOL (IC_LEFT (ric))->rname,
2669                                 ic->op,
2670                                 (int) operandLitValue (IC_RIGHT (ic)));
2671
2672                         //s += strlen(s);
2673                         //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2674                         //continue ;
2675                         //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2676                         return buffer;
2677                 }
2678
2679                 /* we reached the end */
2680                 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2681                 break;
2682         }
2683
2684         printf ("%s\n", buffer);
2685         return buffer;
2686 }
2687 #endif
2688
2689 /*-----------------------------------------------------------------*/
2690 /* regTypeNum - computes the type & number of registers required   */
2691 /*-----------------------------------------------------------------*/
2692 static void
2693 regTypeNum ()
2694 {
2695         symbol *sym;
2696         int k;
2697         iCode *ic;
2698
2699         debugLog ("%s\n", __FUNCTION__);
2700         /* for each live range do */
2701         for (sym = hTabFirstItem (liveRanges, &k); sym;
2702         sym = hTabNextItem (liveRanges, &k)) {
2703
2704                 debugLog ("  %d - %s\n", __LINE__, sym->rname);
2705
2706                 /* if used zero times then no registers needed */
2707                 if ((sym->liveTo - sym->liveFrom) == 0)
2708                         continue;
2709
2710
2711                 /* if the live range is a temporary */
2712                 if (sym->isitmp) {
2713
2714                         debugLog ("  %d - itemp register\n", __LINE__);
2715
2716                         /* if the type is marked as a conditional */
2717                         if (sym->regType == REG_CND)
2718                                 continue;
2719
2720                                 /* if used in return only then we don't
2721                         need registers */
2722                         if (sym->accuse) {
2723                                 if (IS_AGGREGATE (sym->type) || sym->isptr)
2724                                         sym->type = aggrToPtr (sym->type, FALSE);
2725                                 debugLog ("  %d - no reg needed - accumulator used\n", __LINE__);
2726
2727                                 continue;
2728                         }
2729
2730                         if (sym->ruonly) {
2731                                 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2732                                 //  sym->type = aggrToPtr (sym->type, FALSE);
2733                                 debugLog ("  %d - used as a return\n", __LINE__);
2734
2735                                 //continue;
2736                         }
2737
2738                         /* if the symbol has only one definition &
2739                         that definition is a get_pointer and the
2740                         pointer we are getting is rematerializable and
2741                         in "data" space */
2742
2743                         if (bitVectnBitsOn (sym->defs) == 1 &&
2744                             (ic = hTabItemWithKey (iCodehTab,
2745                                                    bitVectFirstBit (sym->defs))) &&
2746                             POINTER_GET (ic) &&
2747                             !IS_BITVAR (sym->etype) &&
2748                             (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2749
2750                                 if (ptrPseudoSymSafe (sym, ic)) {
2751
2752                                         symbol *psym;
2753
2754                                         debugLog ("  %d - \n", __LINE__);
2755
2756                                         /* create a psuedo symbol & force a spil */
2757                                         //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2758                                         psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2759                                         psym->type = sym->type;
2760                                         psym->etype = sym->etype;
2761                                         psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2762                                         strcpy (psym->rname, psym->name);
2763                                         sym->isspilt = 1;
2764                                         sym->usl.spillLoc = psym;
2765                                         continue;
2766                                 }
2767
2768                                 /* if in data space or idata space then try to
2769                                 allocate pointer register */
2770
2771                         }
2772
2773                         /* if not then we require registers */
2774                         sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2775                                 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2776                         getSize (sym->type));
2777
2778
2779                         if(IS_PTR_CONST (sym->type)) {
2780                                 debugLog ("  %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2781                                 sym->nRegs = 2;
2782                         }
2783
2784                         if (sym->nRegs > 4) {
2785                                 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2786                                 printTypeChain (sym->type, stderr);
2787                                 fprintf (stderr, "\n");
2788                         }
2789
2790                         /* determine the type of register required */
2791                         if (sym->nRegs == 1 &&
2792                                 IS_PTR (sym->type) &&
2793                                 sym->uptr)
2794                                 sym->regType = REG_PTR;
2795                         else
2796                                 sym->regType = REG_GPR;
2797
2798
2799                         debugLog ("  reg name %s,  reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2800
2801                 }
2802                 else
2803                         /* for the first run we don't provide */
2804                         /* registers for true symbols we will */
2805                         /* see how things go                  */
2806                         sym->nRegs = 0;
2807   }
2808
2809 }
2810 DEFSETFUNC (markRegFree)
2811 {
2812         ((regs *)item)->isFree = 1;
2813
2814         return 0;
2815 }
2816
2817 DEFSETFUNC (deallocReg)
2818 {
2819         fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2820         ((regs *)item)->isFree = 1;
2821         ((regs *)item)->wasUsed = 0;
2822
2823         return 0;
2824 }
2825 /*-----------------------------------------------------------------*/
2826 /* freeAllRegs - mark all registers as free                        */
2827 /*-----------------------------------------------------------------*/
2828 void
2829 pic14_freeAllRegs ()
2830 {
2831         //  int i;
2832
2833         debugLog ("%s\n", __FUNCTION__);
2834
2835         applyToSet(dynAllocRegs,markRegFree);
2836         applyToSet(dynStackRegs,markRegFree);
2837
2838         /*
2839         for (i = 0; i < pic14_nRegs; i++)
2840         regspic14[i].isFree = 1;
2841         */
2842 }
2843
2844 /*-----------------------------------------------------------------*/
2845 /*-----------------------------------------------------------------*/
2846 void
2847 pic14_deallocateAllRegs ()
2848 {
2849         //  int i;
2850
2851         debugLog ("%s\n", __FUNCTION__);
2852
2853         applyToSet(dynAllocRegs,deallocReg);
2854
2855         /*
2856         for (i = 0; i < pic14_nRegs; i++) {
2857                 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2858                 regspic14[i].isFree = 1;
2859                 regspic14[i].wasUsed = 0;
2860                 }
2861         }
2862         */
2863 }
2864
2865
2866 /*-----------------------------------------------------------------*/
2867 /* deallocStackSpil - this will set the stack pointer back         */
2868 /*-----------------------------------------------------------------*/
2869 static
2870 DEFSETFUNC (deallocStackSpil)
2871 {
2872         symbol *sym = item;
2873
2874         debugLog ("%s\n", __FUNCTION__);
2875         deallocLocal (sym);
2876         return 0;
2877 }
2878
2879 /*-----------------------------------------------------------------*/
2880 /* farSpacePackable - returns the packable icode for far variables */
2881 /*-----------------------------------------------------------------*/
2882 static iCode *
2883 farSpacePackable (iCode * ic)
2884 {
2885         iCode *dic;
2886
2887         debugLog ("%s\n", __FUNCTION__);
2888         /* go thru till we find a definition for the
2889         symbol on the right */
2890         for (dic = ic->prev; dic; dic = dic->prev)
2891         {
2892
2893                 /* if the definition is a call then no */
2894                 if ((dic->op == CALL || dic->op == PCALL) &&
2895                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2896                 {
2897                         return NULL;
2898                 }
2899
2900                 /* if shift by unknown amount then not */
2901                 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2902                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2903                         return NULL;
2904
2905                 /* if pointer get and size > 1 */
2906                 if (POINTER_GET (dic) &&
2907                         getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2908                         return NULL;
2909
2910                 if (POINTER_SET (dic) &&
2911                         getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2912                         return NULL;
2913
2914                 /* if any three is a true symbol in far space */
2915                 if (IC_RESULT (dic) &&
2916                         IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2917                         isOperandInFarSpace (IC_RESULT (dic)))
2918                         return NULL;
2919
2920                 if (IC_RIGHT (dic) &&
2921                         IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2922                         isOperandInFarSpace (IC_RIGHT (dic)) &&
2923                         !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2924                         return NULL;
2925
2926                 if (IC_LEFT (dic) &&
2927                         IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2928                         isOperandInFarSpace (IC_LEFT (dic)) &&
2929                         !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2930                         return NULL;
2931
2932                 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2933                 {
2934                         if ((dic->op == LEFT_OP ||
2935                                 dic->op == RIGHT_OP ||
2936                                 dic->op == '-') &&
2937                                 IS_OP_LITERAL (IC_RIGHT (dic)))
2938                                 return NULL;
2939                         else
2940                                 return dic;
2941                 }
2942         }
2943
2944         return NULL;
2945 }
2946
2947 /*-----------------------------------------------------------------*/
2948 /* packRegsForAssign - register reduction for assignment           */
2949 /*-----------------------------------------------------------------*/
2950 static int
2951 packRegsForAssign (iCode * ic, eBBlock * ebp)
2952 {
2953
2954         iCode *dic, *sic;
2955
2956         debugLog ("%s\n", __FUNCTION__);
2957
2958         debugAopGet ("  result:", IC_RESULT (ic));
2959         debugAopGet ("  left:", IC_LEFT (ic));
2960         debugAopGet ("  right:", IC_RIGHT (ic));
2961
2962         /* if this is at an absolute address, then get the address. */
2963         if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2964                 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2965                         debugLog ("  %d - found config word declaration\n", __LINE__);
2966                         if(IS_VALOP(IC_RIGHT(ic))) {
2967                                 debugLog ("  setting config word to %x\n",
2968                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2969                                 assignConfigWordValue(  SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2970                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2971                         }
2972
2973                         /* remove the assignment from the iCode chain. */
2974
2975                         remiCodeFromeBBlock (ebp, ic);
2976                         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2977                         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2978
2979                         return 1;
2980
2981                 }
2982         }
2983
2984         if (!IS_ITEMP (IC_RESULT (ic))) {
2985                 allocDirReg(IC_RESULT (ic));
2986                 debugLog ("  %d - result is not temp\n", __LINE__);
2987         }
2988         /*
2989         if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2990         debugLog ("  %d - left is not temp, allocating\n", __LINE__);
2991         allocDirReg(IC_LEFT (ic));
2992         }
2993         */
2994
2995         if (!IS_ITEMP (IC_RIGHT (ic))) {
2996                 debugLog ("  %d - not packing - right is not temp\n", __LINE__);
2997
2998                 /* only pack if this is not a function pointer */
2999                 if (!IS_REF (IC_RIGHT (ic)))
3000                         allocDirReg(IC_RIGHT (ic));
3001                 return 0;
3002         }
3003
3004         if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
3005                 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
3006         {
3007                 debugLog ("  %d - not packing - right side fails \n", __LINE__);
3008                 return 0;
3009         }
3010
3011         /* if the true symbol is defined in far space or on stack
3012         then we should not since this will increase register pressure */
3013         if (isOperandInFarSpace (IC_RESULT (ic)))
3014         {
3015                 if ((dic = farSpacePackable (ic)))
3016                         goto pack;
3017                 else
3018                         return 0;
3019
3020         }
3021         /* find the definition of iTempNN scanning backwards if we find a
3022         a use of the true symbol before we find the definition then
3023         we cannot pack */
3024         for (dic = ic->prev; dic; dic = dic->prev)
3025         {
3026
3027         /* if there is a function call and this is
3028                 a parameter & not my parameter then don't pack it */
3029                 if ((dic->op == CALL || dic->op == PCALL) &&
3030                         (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
3031                         !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
3032                 {
3033                         debugLog ("  %d - \n", __LINE__);
3034                         dic = NULL;
3035                         break;
3036                 }
3037
3038                 if (SKIP_IC2 (dic))
3039                         continue;
3040
3041                 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3042                         IS_OP_VOLATILE (IC_RESULT (dic)))
3043                 {
3044                         debugLog ("  %d - dic is VOLATILE \n", __LINE__);
3045                         dic = NULL;
3046                         break;
3047                 }
3048
3049                 if (IS_SYMOP (IC_RESULT (dic)) &&
3050                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3051                 {
3052                         /* A previous result was assigned to the same register - we'll our definition */
3053                         debugLog ("  %d - dic result key == ic right key -- pointer set=%c\n",
3054                                 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3055                         if (POINTER_SET (dic))
3056                                 dic = NULL;
3057
3058                         break;
3059                 }
3060
3061                 if (IS_SYMOP (IC_RIGHT (dic)) &&
3062                         (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3063                         IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3064                 {
3065                         debugLog ("  %d - dic right key == ic rightor result key\n", __LINE__);
3066                         dic = NULL;
3067                         break;
3068                 }
3069
3070                 if (IS_SYMOP (IC_LEFT (dic)) &&
3071                         (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3072                         IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3073                 {
3074                         debugLog ("  %d - dic left key == ic rightor result key\n", __LINE__);
3075                         dic = NULL;
3076                         break;
3077                 }
3078
3079                 if (POINTER_SET (dic) &&
3080                         IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3081                 {
3082                         debugLog ("  %d - dic result key == ic result key -- pointer set=Y\n",
3083                                 __LINE__);
3084                         dic = NULL;
3085                         break;
3086                 }
3087         }
3088
3089         if (!dic)
3090                 return 0;                       /* did not find */
3091
3092                                                         /* if the result is on stack or iaccess then it must be
3093         the same atleast one of the operands */
3094         if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3095                 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3096         {
3097
3098         /* the operation has only one symbol
3099                 operator then we can pack */
3100                 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3101                         (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3102                         goto pack;
3103
3104                 if (!((IC_LEFT (dic) &&
3105                         IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3106                         (IC_RIGHT (dic) &&
3107                         IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3108                         return 0;
3109         }
3110 pack:
3111         debugLog ("  packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3112         debugLog ("  replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3113         /* found the definition */
3114         /* replace the result with the result of */
3115         /* this assignment and remove this assignment */
3116         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3117         IC_RESULT (dic) = IC_RESULT (ic);
3118
3119         if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3120         {
3121                 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3122         }
3123         /* delete from liverange table also
3124         delete from all the points inbetween and the new
3125         one */
3126         for (sic = dic; sic != ic; sic = sic->next)
3127         {
3128                 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3129                 if (IS_ITEMP (IC_RESULT (dic)))
3130                         bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3131         }
3132
3133         remiCodeFromeBBlock (ebp, ic);
3134         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3135         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3136         OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3137         return 1;
3138
3139
3140 }
3141
3142 /*-----------------------------------------------------------------*/
3143 /* findAssignToSym : scanning backwards looks for first assig found */
3144 /*-----------------------------------------------------------------*/
3145 static iCode *
3146 findAssignToSym (operand * op, iCode * ic)
3147 {
3148         iCode *dic;
3149
3150         debugLog ("%s\n", __FUNCTION__);
3151         for (dic = ic->prev; dic; dic = dic->prev)
3152         {
3153
3154                 /* if definition by assignment */
3155                 if (dic->op == '=' &&
3156                         !POINTER_SET (dic) &&
3157                         IC_RESULT (dic)->key == op->key
3158                         /*          &&  IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3159                         )
3160                 {
3161
3162                         /* we are interested only if defined in far space */
3163                         /* or in stack space in case of + & - */
3164
3165                         /* if assigned to a non-symbol then return
3166                         true */
3167                         if (!IS_SYMOP (IC_RIGHT (dic)))
3168                                 break;
3169
3170                                 /* if the symbol is in far space then
3171                         we should not */
3172                         if (isOperandInFarSpace (IC_RIGHT (dic)))
3173                                 return NULL;
3174
3175                                 /* for + & - operations make sure that
3176                                 if it is on the stack it is the same
3177                         as one of the three operands */
3178                         if ((ic->op == '+' || ic->op == '-') &&
3179                                 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3180                         {
3181
3182                                 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3183                                         IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3184                                         IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3185                                         return NULL;
3186                         }
3187
3188                         break;
3189
3190                 }
3191
3192                 /* if we find an usage then we cannot delete it */
3193                 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3194                         return NULL;
3195
3196                 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3197                         return NULL;
3198
3199                 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3200                         return NULL;
3201         }
3202
3203         /* now make sure that the right side of dic
3204         is not defined between ic & dic */
3205         if (dic)
3206         {
3207                 iCode *sic = dic->next;
3208
3209                 for (; sic != ic; sic = sic->next)
3210                         if (IC_RESULT (sic) &&
3211                                 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3212                                 return NULL;
3213         }
3214
3215         return dic;
3216
3217
3218 }
3219
3220 /*-----------------------------------------------------------------*/
3221 /* packRegsForSupport :- reduce some registers for support calls   */
3222 /*-----------------------------------------------------------------*/
3223 static int
3224 packRegsForSupport (iCode * ic, eBBlock * ebp)
3225 {
3226         int change = 0;
3227
3228         debugLog ("%s\n", __FUNCTION__);
3229         /* for the left & right operand :- look to see if the
3230         left was assigned a true symbol in far space in that
3231         case replace them */
3232         if (IS_ITEMP (IC_LEFT (ic)) &&
3233                 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3234         {
3235                 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3236                 iCode *sic;
3237
3238                 if (!dic)
3239                         goto right;
3240
3241                 debugAopGet ("removing left:", IC_LEFT (ic));
3242
3243                 /* found it we need to remove it from the
3244                 block */
3245                 for (sic = dic; sic != ic; sic = sic->next)
3246                         bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3247
3248                 IC_LEFT (ic)->operand.symOperand =
3249                         IC_RIGHT (dic)->operand.symOperand;
3250                 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3251                 remiCodeFromeBBlock (ebp, dic);
3252                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3253                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3254                 change++;
3255         }
3256
3257         /* do the same for the right operand */
3258 right:
3259         if (!change &&
3260                 IS_ITEMP (IC_RIGHT (ic)) &&
3261                 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3262         {
3263                 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3264                 iCode *sic;
3265
3266                 if (!dic)
3267                         return change;
3268
3269                         /* if this is a subtraction & the result
3270                 is a true symbol in far space then don't pack */
3271                 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3272                 {
3273                         sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3274                         if (IN_FARSPACE (SPEC_OCLS (etype)))
3275                                 return change;
3276                 }
3277
3278                 debugAopGet ("removing right:", IC_RIGHT (ic));
3279
3280                 /* found it we need to remove it from the
3281                 block */
3282                 for (sic = dic; sic != ic; sic = sic->next)
3283                         bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3284
3285                 IC_RIGHT (ic)->operand.symOperand =
3286                         IC_RIGHT (dic)->operand.symOperand;
3287                 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3288
3289                 remiCodeFromeBBlock (ebp, dic);
3290                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3291                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3292                 change++;
3293         }
3294
3295         return change;
3296 }
3297
3298 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3299
3300
3301 /*-----------------------------------------------------------------*/
3302 /* packRegsForOneuse : - will reduce some registers for single Use */
3303 /*-----------------------------------------------------------------*/
3304 static iCode *
3305 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3306 {
3307         bitVect *uses;
3308         iCode *dic, *sic;
3309
3310         debugLog ("%s\n", __FUNCTION__);
3311         /* if returning a literal then do nothing */
3312         if (!IS_SYMOP (op))
3313                 return NULL;
3314
3315                 /* only upto 2 bytes since we cannot predict
3316         the usage of b, & acc */
3317         if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3318                 ic->op != RETURN &&
3319                 ic->op != SEND)
3320                 return NULL;
3321
3322                 /* this routine will mark the a symbol as used in one
3323                 instruction use only && if the definition is local
3324                 (ie. within the basic block) && has only one definition &&
3325                 that definition is either a return value from a
3326                 function or does not contain any variables in
3327         far space */
3328         uses = bitVectCopy (OP_USES (op));
3329         bitVectUnSetBit (uses, ic->key);        /* take away this iCode */
3330         if (!bitVectIsZero (uses))      /* has other uses */
3331                 return NULL;
3332
3333         /* if it has only one defintion */
3334         if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3335                 return NULL;            /* has more than one definition */
3336
3337         /* get that definition */
3338         if (!(dic =
3339                 hTabItemWithKey (iCodehTab,
3340                 bitVectFirstBit (OP_DEFS (op)))))
3341                 return NULL;
3342
3343         /* found the definition now check if it is local */
3344         if (dic->seq < ebp->fSeq ||
3345                 dic->seq > ebp->lSeq)
3346                 return NULL;            /* non-local */
3347
3348                                                         /* now check if it is the return from
3349         a function call */
3350         if (dic->op == CALL || dic->op == PCALL)
3351         {
3352                 if (ic->op != SEND && ic->op != RETURN &&
3353                         !POINTER_SET(ic) && !POINTER_GET(ic))
3354                 {
3355                         OP_SYMBOL (op)->ruonly = 1;
3356                         return dic;
3357                 }
3358                 dic = dic->next;
3359         }
3360
3361
3362         /* otherwise check that the definition does
3363         not contain any symbols in far space */
3364         if (isOperandInFarSpace (IC_LEFT (dic)) ||
3365                 isOperandInFarSpace (IC_RIGHT (dic)) ||
3366                 IS_OP_RUONLY (IC_LEFT (ic)) ||
3367                 IS_OP_RUONLY (IC_RIGHT (ic)))
3368         {
3369                 return NULL;
3370         }
3371
3372         /* if pointer set then make sure the pointer
3373         is one byte */
3374         if (POINTER_SET (dic) &&
3375                 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3376                 return NULL;
3377
3378         if (POINTER_GET (dic) &&
3379                 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3380                 return NULL;
3381
3382         sic = dic;
3383
3384         /* also make sure the intervenening instructions
3385         don't have any thing in far space */
3386         for (dic = dic->next; dic && dic != ic; dic = dic->next)
3387         {
3388
3389                 /* if there is an intervening function call then no */
3390                 if (dic->op == CALL || dic->op == PCALL)
3391                         return NULL;
3392                         /* if pointer set then make sure the pointer
3393                 is one byte */
3394                 if (POINTER_SET (dic) &&
3395                         !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3396                         return NULL;
3397
3398                 if (POINTER_GET (dic) &&
3399                         !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3400                         return NULL;
3401
3402                 /* if address of & the result is remat then okay */
3403                 if (dic->op == ADDRESS_OF &&
3404                         OP_SYMBOL (IC_RESULT (dic))->remat)
3405                         continue;
3406
3407                         /* if operand has size of three or more & this
3408                         operation is a '*','/' or '%' then 'b' may
3409                 cause a problem */
3410                 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3411                         getSize (operandType (op)) >= 3)
3412                         return NULL;
3413
3414                 /* if left or right or result is in far space */
3415                 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3416                         isOperandInFarSpace (IC_RIGHT (dic)) ||
3417                         isOperandInFarSpace (IC_RESULT (dic)) ||
3418                         IS_OP_RUONLY (IC_LEFT (dic)) ||
3419                         IS_OP_RUONLY (IC_RIGHT (dic)) ||
3420                         IS_OP_RUONLY (IC_RESULT (dic)))
3421                 {
3422                         return NULL;
3423                 }
3424         }
3425
3426         OP_SYMBOL (op)->ruonly = 1;
3427         return sic;
3428
3429 }
3430
3431 /*-----------------------------------------------------------------*/
3432 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN          */
3433 /*-----------------------------------------------------------------*/
3434 static bool
3435 isBitwiseOptimizable (iCode * ic)
3436 {
3437         sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3438         sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3439
3440         debugLog ("%s\n", __FUNCTION__);
3441         /* bitwise operations are considered optimizable
3442         under the following conditions (Jean-Louis VERN)
3443
3444           x & lit
3445           bit & bit
3446           bit & x
3447           bit ^ bit
3448           bit ^ x
3449           x   ^ lit
3450           x   | lit
3451           bit | bit
3452           bit | x
3453         */
3454         if (IS_LITERAL (rtype) ||
3455                 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3456                 return TRUE;
3457         else
3458                 return FALSE;
3459 }
3460
3461 /*-----------------------------------------------------------------*/
3462 /* packRegsForAccUse - pack registers for acc use                  */
3463 /*-----------------------------------------------------------------*/
3464 static void
3465 packRegsForAccUse (iCode * ic)
3466 {
3467         iCode *uic;
3468
3469         debugLog ("%s\n", __FUNCTION__);
3470
3471         /* if this is an aggregate, e.g. a one byte char array */
3472         if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3473                 return;
3474         }
3475         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3476
3477         /* if + or - then it has to be one byte result */
3478         if ((ic->op == '+' || ic->op == '-')
3479                 && getSize (operandType (IC_RESULT (ic))) > 1)
3480                 return;
3481
3482         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3483         /* if shift operation make sure right side is not a literal */
3484         if (ic->op == RIGHT_OP &&
3485                 (isOperandLiteral (IC_RIGHT (ic)) ||
3486                 getSize (operandType (IC_RESULT (ic))) > 1))
3487                 return;
3488
3489         if (ic->op == LEFT_OP &&
3490                 (isOperandLiteral (IC_RIGHT (ic)) ||
3491                 getSize (operandType (IC_RESULT (ic))) > 1))
3492                 return;
3493
3494         if (IS_BITWISE_OP (ic) &&
3495                 getSize (operandType (IC_RESULT (ic))) > 1)
3496                 return;
3497
3498
3499         /* has only one definition */
3500         if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3501                 return;
3502
3503         /* has only one use */
3504         if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3505                 return;
3506
3507         /* and the usage immediately follows this iCode */
3508         if (!(uic = hTabItemWithKey (iCodehTab,
3509                 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3510                 return;
3511
3512         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3513         if (ic->next != uic)
3514                 return;
3515
3516         /* if it is a conditional branch then we definitely can */
3517         if (uic->op == IFX)
3518                 goto accuse;
3519
3520         if (uic->op == JUMPTABLE)
3521                 return;
3522
3523                 /* if the usage is not is an assignment
3524         or an arithmetic / bitwise / shift operation then not */
3525         if (POINTER_SET (uic) &&
3526                 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3527                 return;
3528
3529         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3530         if (uic->op != '=' &&
3531                 !IS_ARITHMETIC_OP (uic) &&
3532                 !IS_BITWISE_OP (uic) &&
3533                 uic->op != LEFT_OP &&
3534                 uic->op != RIGHT_OP)
3535                 return;
3536
3537         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3538         /* if used in ^ operation then make sure right is not a
3539         literl */
3540         if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3541                 return;
3542
3543         /* if shift operation make sure right side is not a literal */
3544         if (uic->op == RIGHT_OP &&
3545                 (isOperandLiteral (IC_RIGHT (uic)) ||
3546                 getSize (operandType (IC_RESULT (uic))) > 1))
3547                 return;
3548
3549         if (uic->op == LEFT_OP &&
3550                 (isOperandLiteral (IC_RIGHT (uic)) ||
3551                 getSize (operandType (IC_RESULT (uic))) > 1))
3552                 return;
3553
3554                 /* make sure that the result of this icode is not on the
3555         stack, since acc is used to compute stack offset */
3556         if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3557                 OP_SYMBOL (IC_RESULT (uic))->onStack)
3558                 return;
3559
3560         /* if either one of them in far space then we cannot */
3561         if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3562                 isOperandInFarSpace (IC_LEFT (uic))) ||
3563                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3564                 isOperandInFarSpace (IC_RIGHT (uic))))
3565                 return;
3566
3567         /* if the usage has only one operand then we can */
3568         if (IC_LEFT (uic) == NULL ||
3569                 IC_RIGHT (uic) == NULL)
3570                 goto accuse;
3571
3572                 /* make sure this is on the left side if not
3573         a '+' since '+' is commutative */
3574         if (ic->op != '+' &&
3575                 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3576                 return;
3577
3578         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3579         /* if one of them is a literal then we can */
3580         if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3581                 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic))))  &&
3582                 (getSize (operandType (IC_RESULT (uic))) <= 1))
3583         {
3584                 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3585                 return;
3586         }
3587
3588         debugLog ("  %s:%d\n", __FUNCTION__,__LINE__);
3589         /* if the other one is not on stack then we can */
3590         if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3591                 (IS_ITEMP (IC_RIGHT (uic)) ||
3592                 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3593                 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3594                 goto accuse;
3595
3596         if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3597                 (IS_ITEMP (IC_LEFT (uic)) ||
3598                 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3599                 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3600                 goto accuse;
3601
3602         return;
3603
3604 accuse:
3605         debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3606         OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3607
3608
3609 }
3610
3611 /*-----------------------------------------------------------------*/
3612 /* packForPush - hueristics to reduce iCode for pushing            */
3613 /*-----------------------------------------------------------------*/
3614 static void
3615 packForReceive (iCode * ic, eBBlock * ebp)
3616 {
3617         iCode *dic;
3618
3619         debugLog ("%s\n", __FUNCTION__);
3620         debugAopGet ("  result:", IC_RESULT (ic));
3621         debugAopGet ("  left:", IC_LEFT (ic));
3622         debugAopGet ("  right:", IC_RIGHT (ic));
3623
3624         if (!ic->next)
3625                 return;
3626
3627         for (dic = ic->next; dic; dic = dic->next)
3628         {
3629
3630
3631
3632                 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3633                         debugLog ("    used on left\n");
3634                 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3635                         debugLog ("    used on right\n");
3636                 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3637                         debugLog ("    used on result\n");
3638
3639                 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3640                         (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3641                         return;
3642
3643         }
3644
3645         debugLog ("  hey we can remove this unnecessary assign\n");
3646 }
3647 /*-----------------------------------------------------------------*/
3648 /* packForPush - hueristics to reduce iCode for pushing            */
3649 /*-----------------------------------------------------------------*/
3650 static void
3651 packForPush (iCode * ic, eBBlock * ebp)
3652 {
3653         iCode *dic;
3654
3655         debugLog ("%s\n", __FUNCTION__);
3656         if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3657                 return;
3658
3659         /* must have only definition & one usage */
3660         if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3661                 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3662                 return;
3663
3664         /* find the definition */
3665         if (!(dic = hTabItemWithKey (iCodehTab,
3666                 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3667                 return;
3668
3669         if (dic->op != '=' || POINTER_SET (dic))
3670                 return;
3671
3672                 /* we now we know that it has one & only one def & use
3673         and the that the definition is an assignment */
3674         IC_LEFT (ic) = IC_RIGHT (dic);
3675
3676         remiCodeFromeBBlock (ebp, dic);
3677         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3678         hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3679 }
3680
3681 void printSymType(char * str, sym_link *sl)
3682 {
3683         debugLog ("    %s Symbol type: ",str);
3684         printTypeChain( sl, debugF);
3685         debugLog ("\n");
3686
3687 }
3688
3689 /*-----------------------------------------------------------------*/
3690 /* some debug code to print the symbol S_TYPE. Note that
3691 * the function checkSClass in src/SDCCsymt.c dinks with
3692 * the S_TYPE in ways the PIC port doesn't fully like...*/
3693 /*-----------------------------------------------------------------*/
3694 void isData(sym_link *sl)
3695 {
3696         FILE *of = stderr;
3697
3698         if(!sl)
3699                 return;
3700
3701         if(debugF)
3702                 of = debugF;
3703
3704         for ( ; sl; sl=sl->next) {
3705                 if(!IS_DECL(sl) ) {
3706                         switch (SPEC_SCLS(sl)) {
3707
3708                         case S_DATA: fprintf (of, "data "); break;
3709                         case S_XDATA: fprintf (of, "xdata "); break;
3710                         case S_SFR: fprintf (of, "sfr "); break;
3711                         case S_SBIT: fprintf (of, "sbit "); break;
3712                         case S_CODE: fprintf (of, "code "); break;
3713                         case S_IDATA: fprintf (of, "idata "); break;
3714                         case S_PDATA: fprintf (of, "pdata "); break;
3715                         case S_LITERAL: fprintf (of, "literal "); break;
3716                         case S_STACK: fprintf (of, "stack "); break;
3717                         case S_XSTACK: fprintf (of, "xstack "); break;
3718                         case S_BIT: fprintf (of, "bit "); break;
3719                         case S_EEPROM: fprintf (of, "eeprom "); break;
3720                         default: break;
3721                         }
3722
3723                 }
3724
3725         }
3726
3727 }
3728 /*-----------------------------------------------------------------*/
3729 /* packRegisters - does some transformations to reduce register    */
3730 /*                   pressure                                      */
3731 /*-----------------------------------------------------------------*/
3732 static void
3733 packRegisters (eBBlock * ebp)
3734 {
3735         iCode *ic;
3736         int change = 0;
3737
3738         debugLog ("%s\n", __FUNCTION__);
3739
3740         while (1) {
3741
3742                 change = 0;
3743
3744                 /* look for assignments of the form */
3745                 /* iTempNN = TRueSym (someoperation) SomeOperand */
3746                 /*       ....                       */
3747                 /* TrueSym := iTempNN:1             */
3748                 for (ic = ebp->sch; ic; ic = ic->next)
3749                 {
3750
3751                         /* find assignment of the form TrueSym := iTempNN:1 */
3752                         if (ic->op == '=' && !POINTER_SET (ic))
3753                                 change += packRegsForAssign (ic, ebp);
3754                         /* debug stuff */
3755                         if (ic->op == '=')
3756                         {
3757                                 if (POINTER_SET (ic))
3758                                         debugLog ("pointer is set\n");
3759                                 debugAopGet ("  result:", IC_RESULT (ic));
3760                                 debugAopGet ("  left:", IC_LEFT (ic));
3761                                 debugAopGet ("  right:", IC_RIGHT (ic));
3762                         }
3763
3764                 }
3765
3766                 if (!change)
3767                         break;
3768         }
3769
3770         for (ic = ebp->sch; ic; ic = ic->next) {
3771
3772                 if(IS_SYMOP ( IC_LEFT(ic))) {
3773                         sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3774
3775                         debugAopGet ("  left:", IC_LEFT (ic));
3776                         if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3777                                 debugLog ("    is a pointer\n");
3778
3779                         if(IS_OP_VOLATILE(IC_LEFT(ic)))
3780                                 debugLog ("    is volatile\n");
3781
3782                         isData(etype);
3783
3784                         printSymType("   ", OP_SYMBOL(IC_LEFT(ic))->type);
3785                 }
3786
3787                 if(IS_SYMOP ( IC_RIGHT(ic))) {
3788                         debugAopGet ("  right:", IC_RIGHT (ic));
3789                         printSymType("    ", OP_SYMBOL(IC_RIGHT(ic))->type);
3790                 }
3791
3792                 if(IS_SYMOP ( IC_RESULT(ic))) {
3793                         debugAopGet ("  result:", IC_RESULT (ic));
3794                         printSymType("     ", OP_SYMBOL(IC_RESULT(ic))->type);
3795                 }
3796
3797                 if (POINTER_SET (ic))
3798                         debugLog ("  %d - Pointer set\n", __LINE__);
3799
3800
3801                         /* if this is an itemp & result of a address of a true sym
3802                 then mark this as rematerialisable   */
3803                 if (ic->op == ADDRESS_OF &&
3804                         IS_ITEMP (IC_RESULT (ic)) &&
3805                         IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3806                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3807                         !OP_SYMBOL (IC_LEFT (ic))->onStack)
3808                 {
3809
3810                         debugLog ("  %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3811
3812                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3813                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3814                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3815
3816                 }
3817
3818                 /* if straight assignment then carry remat flag if
3819                 this is the only definition */
3820                 if (ic->op == '=' &&
3821                         !POINTER_SET (ic) &&
3822                         IS_SYMOP (IC_RIGHT (ic)) &&
3823                         OP_SYMBOL (IC_RIGHT (ic))->remat &&
3824                         bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3825                 {
3826                         debugLog ("  %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3827
3828                         OP_SYMBOL (IC_RESULT (ic))->remat =
3829                                 OP_SYMBOL (IC_RIGHT (ic))->remat;
3830                         OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3831                                 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3832                 }
3833
3834                 /* if this is a +/- operation with a rematerizable
3835                 then mark this as rematerializable as well */
3836                 if ((ic->op == '+' || ic->op == '-') &&
3837                         (IS_SYMOP (IC_LEFT (ic)) &&
3838                         IS_ITEMP (IC_RESULT (ic)) &&
3839                         OP_SYMBOL (IC_LEFT (ic))->remat &&
3840                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3841                         IS_OP_LITERAL (IC_RIGHT (ic))))
3842                 {
3843                         debugLog ("  %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3844                         //int i =
3845                         operandLitValue (IC_RIGHT (ic));
3846                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3847                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3848                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3849                 }
3850
3851                 /* mark the pointer usages */
3852                 if (POINTER_SET (ic))
3853                 {
3854                         OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3855                         debugLog ("  marking as a pointer (set) =>");
3856                         debugAopGet ("  result:", IC_RESULT (ic));
3857                 }
3858                 if (POINTER_GET (ic))
3859                 {
3860                         OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3861                         debugLog ("  marking as a pointer (get) =>");
3862                         debugAopGet ("  left:", IC_LEFT (ic));
3863                 }
3864
3865                 if (!SKIP_IC2 (ic))
3866                 {
3867                 /* if we are using a symbol on the stack
3868                         then we should say pic14_ptrRegReq */
3869                         if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3870                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3871                                 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3872                         else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3873                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3874                                 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3875                         else
3876                         {
3877                                 if (IS_SYMOP (IC_LEFT (ic)))
3878                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3879                                         OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3880                                 if (IS_SYMOP (IC_RIGHT (ic)))
3881                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3882                                         OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3883                                 if (IS_SYMOP (IC_RESULT (ic)))
3884                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3885                                         OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3886                         }
3887
3888                         debugLog ("  %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3889
3890                 }
3891
3892                 /* if the condition of an if instruction
3893                 is defined in the previous instruction then
3894                 mark the itemp as a conditional */
3895                 if ((IS_CONDITIONAL (ic) ||
3896                         ((ic->op == BITWISEAND ||
3897                         ic->op == '|' ||
3898                         ic->op == '^') &&
3899                         isBitwiseOptimizable (ic))) &&
3900                         ic->next && ic->next->op == IFX &&
3901                         isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3902                         OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3903                 {
3904
3905                         debugLog ("  %d\n", __LINE__);
3906                         OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3907                         continue;
3908                 }
3909
3910                 /* reduce for support function calls */
3911                 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3912                         packRegsForSupport (ic, ebp);
3913
3914                 /* if a parameter is passed, it's in W, so we may not
3915                 need to place a copy in a register */
3916                 if (ic->op == RECEIVE)
3917                         packForReceive (ic, ebp);
3918
3919                 /* some cases the redundant moves can
3920                 can be eliminated for return statements */
3921                 if ((ic->op == RETURN || ic->op == SEND) &&
3922                         !isOperandInFarSpace (IC_LEFT (ic)) &&
3923                         !options.model)
3924                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3925
3926                 /* if pointer set & left has a size more than
3927                 one and right is not in far space */
3928                 if (POINTER_SET (ic) &&
3929                         !isOperandInFarSpace (IC_RIGHT (ic)) &&
3930                         !OP_SYMBOL (IC_RESULT (ic))->remat &&
3931                         !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3932                         getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3933
3934                         packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3935
3936                 /* if pointer get */
3937                 if (POINTER_GET (ic) &&
3938                         !isOperandInFarSpace (IC_RESULT (ic)) &&
3939                         !OP_SYMBOL (IC_LEFT (ic))->remat &&
3940                         !IS_OP_RUONLY (IC_RESULT (ic)) &&
3941                         getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3942
3943                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3944
3945
3946                         /* if this is cast for intergral promotion then
3947                         check if only use of  the definition of the
3948                         operand being casted/ if yes then replace
3949                         the result of that arithmetic operation with
3950                 this result and get rid of the cast */
3951                 if (ic->op == CAST) {
3952
3953                         sym_link *fromType = operandType (IC_RIGHT (ic));
3954                         sym_link *toType = operandType (IC_LEFT (ic));
3955
3956                         debugLog ("  %d - casting\n", __LINE__);
3957
3958                         if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3959                                 getSize (fromType) != getSize (toType)) {
3960
3961
3962                                 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3963                                 if (dic) {
3964
3965                                         if (IS_ARITHMETIC_OP (dic)) {
3966
3967                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3968                                                 IC_RESULT (dic) = IC_RESULT (ic);
3969                                                 remiCodeFromeBBlock (ebp, ic);
3970                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3971                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3972                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3973                                                 ic = ic->prev;
3974                                         }  else
3975
3976                                                 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3977                                 }
3978                         } else {
3979
3980                         /* if the type from and type to are the same
3981                                 then if this is the only use then packit */
3982                                 if (compareType (operandType (IC_RIGHT (ic)),
3983                                         operandType (IC_LEFT (ic))) == 1) {
3984
3985                                         iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3986                                         if (dic) {
3987
3988                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3989                                                 IC_RESULT (dic) = IC_RESULT (ic);
3990                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3991                                                 remiCodeFromeBBlock (ebp, ic);
3992                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3993                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3994                                                 ic = ic->prev;
3995                                         }
3996                                 }
3997                         }
3998                 }
3999
4000                 /* pack for PUSH
4001                 iTempNN := (some variable in farspace) V1
4002                 push iTempNN ;
4003                 -------------
4004                 push V1
4005                 */
4006                 if (ic->op == IPUSH)
4007                 {
4008                         packForPush (ic, ebp);
4009                 }
4010
4011
4012                 /* pack registers for accumulator use, when the
4013                 result of an arithmetic or bit wise operation
4014                 has only one use, that use is immediately following
4015                 the defintion and the using iCode has only one
4016                 operand or has two operands but one is literal &
4017                 the result of that operation is not on stack then
4018                 we can leave the result of this operation in acc:b
4019                 combination */
4020                 if ((IS_ARITHMETIC_OP (ic)
4021
4022                         || IS_BITWISE_OP (ic)
4023
4024                         || ic->op == LEFT_OP || ic->op == RIGHT_OP
4025
4026                         ) &&
4027                         IS_ITEMP (IC_RESULT (ic)) &&
4028                         getSize (operandType (IC_RESULT (ic))) <= 2)
4029
4030                         packRegsForAccUse (ic);
4031
4032   }
4033 }
4034
4035 static void
4036 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4037 {
4038         int i;
4039
4040         if (!debug || !debugF)
4041                 return;
4042
4043         for (i = 0; i < count; i++)
4044         {
4045                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4046                 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4047                         ebbs[i]->entryLabel->name,
4048                         ebbs[i]->depth,
4049                         ebbs[i]->noPath,
4050                         ebbs[i]->isLastInLoop);
4051                 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4052                         ebbs[i]->dfnum,
4053                         ebbs[i]->bbnum,
4054                         ebbs[i]->fSeq,
4055                         ebbs[i]->lSeq);
4056                 fprintf (debugF, "visited %d : hasFcall = %d\n",
4057                         ebbs[i]->visited,
4058                         ebbs[i]->hasFcall);
4059
4060                 fprintf (debugF, "\ndefines bitVector :");
4061                 bitVectDebugOn (ebbs[i]->defSet, debugF);
4062                 fprintf (debugF, "\nlocal defines bitVector :");
4063                 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4064                 fprintf (debugF, "\npointers Set bitvector :");
4065                 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4066                 fprintf (debugF, "\nin pointers Set bitvector :");
4067                 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4068                 fprintf (debugF, "\ninDefs Set bitvector :");
4069                 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4070                 fprintf (debugF, "\noutDefs Set bitvector :");
4071                 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4072                 fprintf (debugF, "\nusesDefs Set bitvector :");
4073                 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4074                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4075                 printiCChain (ebbs[i]->sch, debugF);
4076         }
4077 }
4078 /*-----------------------------------------------------------------*/
4079 /* assignRegisters - assigns registers to each live range as need  */
4080 /*-----------------------------------------------------------------*/
4081 void
4082 pic14_assignRegisters (eBBlock ** ebbs, int count)
4083 {
4084         iCode *ic;
4085         int i;
4086
4087         debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4088         debugLog ("\nebbs before optimizing:\n");
4089         dumpEbbsToDebug (ebbs, count);
4090
4091         setToNull ((void *) &_G.funcrUsed);
4092         pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4093
4094
4095         /* change assignments this will remove some
4096         live ranges reducing some register pressure */
4097         for (i = 0; i < count; i++)
4098                 packRegisters (ebbs[i]);
4099
4100         {
4101                 regs *reg;
4102                 int hkey;
4103                 int i=0;
4104
4105                 debugLog("dir registers allocated so far:\n");
4106                 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4107
4108                 while(reg) {
4109                         debugLog("  -- #%d reg = %s  key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4110                         reg = hTabNextItem(dynDirectRegNames, &hkey);
4111                 }
4112
4113         }
4114
4115         if (options.dump_pack)
4116                 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4117
4118                 /* first determine for each live range the number of
4119         registers & the type of registers required for each */
4120         regTypeNum ();
4121
4122         /* and serially allocate registers */
4123         serialRegAssign (ebbs, count);
4124
4125         /* if stack was extended then tell the user */
4126         if (_G.stackExtend)
4127         {
4128                 /*      werror(W_TOOMANY_SPILS,"stack", */
4129                 /*             _G.stackExtend,currFunc->name,""); */
4130                 _G.stackExtend = 0;
4131         }
4132
4133         if (_G.dataExtend)
4134         {
4135                 /*      werror(W_TOOMANY_SPILS,"data space", */
4136                 /*             _G.dataExtend,currFunc->name,""); */
4137                 _G.dataExtend = 0;
4138         }
4139
4140         /* after that create the register mask
4141         for each of the instruction */
4142         createRegMask (ebbs, count);
4143
4144         /* redo that offsets for stacked automatic variables */
4145         redoStackOffsets ();
4146
4147         if (options.dump_rassgn)
4148                 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4149
4150         /* now get back the chain */
4151         ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4152
4153         debugLog ("ebbs after optimizing:\n");
4154         dumpEbbsToDebug (ebbs, count);
4155
4156
4157         genpic14Code (ic);
4158
4159         /* free up any _G.stackSpil locations allocated */
4160         applyToSet (_G.stackSpil, deallocStackSpil);
4161         _G.slocNum = 0;
4162         setToNull ((void *) &_G.stackSpil);
4163         setToNull ((void *) &_G.spiltSet);
4164         /* mark all registers as free */
4165         //pic14_freeAllRegs ();
4166
4167         debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");
4168         debugLogClose ();
4169         return;
4170 }