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   1 /*------------------------------------------------------------------------
   2
   3   SDCCralloc.c - source file for register allocation. (8051) specific
   4
   5         Written By -  Sandeep Dutta . sandeep.dutta@usa.net (1998)
   6         Added Pic Port T.scott Dattalo scott@dattalo.com (2000)
   7
   8   This program is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by the
  10   Free Software Foundation; either version 2, or (at your option) any
  11   later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21
  22   In other words, you are welcome to use, share and improve this program.
  23   You are forbidden to forbid anyone else to use, share and improve
  24   what you give them.   Help stamp out software-hoarding!
  25 -------------------------------------------------------------------------*/
  26
  27 #include "common.h"
  28 #include "ralloc.h"
  29 #include "pcode.h"
  30 #include "gen.h"
  31
  32
  33 #if defined(__BORLANDC__) || defined(_MSC_VER)
  34 #define STRCASECMP stricmp
  35 #define FENTRY2                 1 ? (void)0 : printf
  36 #else
  37 #define STRCASECMP strcasecmp
  38 //#define FENTRY2(fmt,...)      do { fprintf (stderr, "%s:%d: called.\n", __FUNCTION__, __LINE__); fprintf (stderr, fmt, ## __VA_ARGS__); } while (0)
  39 #define FENTRY2                 1 ? (void)0 : printf
  40 #endif
  41
  42 /* this should go in SDCCicode.h, but it doesn't. */
  43 #define IS_REF(op)       (IS_SYMOP(op) && op->operand.symOperand->isref == 1)
  44
  45 /*-----------------------------------------------------------------*/
  46 /* At this point we start getting processor specific although      */
  47 /* some routines are non-processor specific & can be reused when   */
  48 /* targetting other processors. The decision for this will have    */
  49 /* to be made on a routine by routine basis                        */
  50 /* routines used to pack registers are most definitely not reusable */
  51 /* since the pack the registers depending strictly on the MCU      */
  52 /*-----------------------------------------------------------------*/
  53
  54 extern void genpic14Code (iCode *);
  55 extern void assignConfigWordValue(int address, int value);
  56
  57 /* Global data */
  58 static struct
  59 {
  60         bitVect *spiltSet;
  61         set *stackSpil;
  62         bitVect *regAssigned;
  63         short blockSpil;
  64         int slocNum;
  65         bitVect *funcrUsed;             /* registers used in a function */
  66         int stackExtend;
  67         int dataExtend;
  68 }
  69 _G;
  70
  71 /* Shared with gen.c */
  72 int pic14_ptrRegReq;            /* one byte pointer register required */
  73
  74
  75 set *dynAllocRegs=NULL;
  76 set *dynStackRegs=NULL;
  77 set *dynProcessorRegs=NULL;
  78 set *dynDirectRegs=NULL;
  79 set *dynDirectBitRegs=NULL;
  80 set *dynInternalRegs=NULL;
  81
  82 static hTab  *dynDirectRegNames= NULL;
  83 // static hTab  *regHash = NULL;    /* a hash table containing ALL registers */
  84
  85 static int dynrIdx=0x20;
  86 static int rDirectIdx=0;
  87
  88 int pic14_nRegs = 128;   // = sizeof (regspic14) / sizeof (regs);
  89
  90 int Gstack_base_addr=0; /* The starting address of registers that
  91                          * are used to pass and return parameters */
  92 int Gstack_size = 0;
  93
  94
  95
  96
  97 static void spillThis (symbol *);
  98 static int debug = 1;
  99 static FILE *debugF = NULL;
 100 /*-----------------------------------------------------------------*/
 101 /* debugLog - open a file for debugging information                */
 102 /*-----------------------------------------------------------------*/
 103 //static void debugLog(char *inst,char *fmt, ...)
 104 static void
 105         debugLog (char *fmt,...)
 106 {
 107         static int append = 0;  // First time through, open the file without append.
 108
 109         char buffer[256];
 110         //char *bufferP=buffer;
 111         va_list ap;
 112
 113         if (!debug || !dstFileName)
 114                 return;
 115
 116
 117         if (!debugF)
 118         {
 119                 /* create the file name */
 120                 strcpy (buffer, dstFileName);
 121                 strcat (buffer, ".d");
 122
 123                 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
 124                 {
 125                         werror (E_FILE_OPEN_ERR, buffer);
 126                         exit (1);
 127                 }
 128                 append = 1;             // Next time debubLog is called, we'll append the debug info
 129
 130         }
 131
 132         va_start (ap, fmt);
 133
 134         vsprintf (buffer, fmt, ap);
 135
 136         fprintf (debugF, "%s", buffer);
 137         /*
 138         while (isspace((unsigned char)*bufferP)) bufferP++;
 139
 140         if (bufferP && *bufferP)
 141                 lineCurr = (lineCurr ?
 142                 connectLine(lineCurr,newLineNode(lb)) :
 143                 (lineHead = newLineNode(lb)));
 144         lineCurr->isInline = _G.inLine;
 145         lineCurr->isDebug  = _G.debugLine;
 146         */
 147         va_end (ap);
 148
 149 }
 150
 151 static void
 152         debugNewLine (void)
 153 {
 154         if (debugF)
 155                 fputc ('\n', debugF);
 156 }
 157  /*-----------------------------------------------------------------*/
 158  /* debugLogClose - closes the debug log file (if opened)           */
 159  /*-----------------------------------------------------------------*/
 160 static void
 161         debugLogClose (void)
 162 {
 163         if (debugF)
 164         {
 165                  fclose (debugF);
 166                  debugF = NULL;
 167         }
 168 }
 169 #define AOP(op) op->aop
 170
 171 static char *
 172         debugAopGet (char *str, operand * op)
 173 {
 174         if (str)
 175                 debugLog (str);
 176
 177         printOperand (op, debugF);
 178         debugNewLine ();
 179
 180         return NULL;
 181
 182 }
 183
 184 static char *
 185         decodeOp (unsigned int op)
 186 {
 187
 188         if (op < 128 && op > ' ')
 189         {
 190                 buffer[0] = (op & 0xff);
 191                 buffer[1] = 0;
 192                 return buffer;
 193         }
 194
 195         switch (op)
 196         {
 197         case IDENTIFIER:                return "IDENTIFIER";
 198         case TYPE_NAME:                 return "TYPE_NAME";
 199         case CONSTANT:                  return "CONSTANT";
 200         case STRING_LITERAL:            return "STRING_LITERAL";
 201         case SIZEOF:                    return "SIZEOF";
 202         case PTR_OP:                    return "PTR_OP";
 203         case INC_OP:                    return "INC_OP";
 204         case DEC_OP:                    return "DEC_OP";
 205         case LEFT_OP:                   return "LEFT_OP";
 206         case RIGHT_OP:                  return "RIGHT_OP";
 207         case LE_OP:                     return "LE_OP";
 208         case GE_OP:                     return "GE_OP";
 209         case EQ_OP:                     return "EQ_OP";
 210         case NE_OP:                     return "NE_OP";
 211         case AND_OP:                    return "AND_OP";
 212         case OR_OP:                     return "OR_OP";
 213         case MUL_ASSIGN:                return "MUL_ASSIGN";
 214         case DIV_ASSIGN:                return "DIV_ASSIGN";
 215         case MOD_ASSIGN:                return "MOD_ASSIGN";
 216         case ADD_ASSIGN:                return "ADD_ASSIGN";
 217         case SUB_ASSIGN:                return "SUB_ASSIGN";
 218         case LEFT_ASSIGN:               return "LEFT_ASSIGN";
 219         case RIGHT_ASSIGN:              return "RIGHT_ASSIGN";
 220         case AND_ASSIGN:                return "AND_ASSIGN";
 221         case XOR_ASSIGN:                return "XOR_ASSIGN";
 222         case OR_ASSIGN:                 return "OR_ASSIGN";
 223         case TYPEDEF:                   return "TYPEDEF";
 224         case EXTERN:                    return "EXTERN";
 225         case STATIC:                    return "STATIC";
 226         case AUTO:                      return "AUTO";
 227         case REGISTER:                  return "REGISTER";
 228         case CODE:                      return "CODE";
 229         case EEPROM:                    return "EEPROM";
 230         case INTERRUPT:                 return "INTERRUPT";
 231         case SFR:                       return "SFR";
 232         case AT:                        return "AT";
 233         case SBIT:                      return "SBIT";
 234         case REENTRANT:                 return "REENTRANT";
 235         case USING:                     return "USING";
 236         case XDATA:                     return "XDATA";
 237         case DATA:                      return "DATA";
 238         case IDATA:                     return "IDATA";
 239         case PDATA:                     return "PDATA";
 240         case VAR_ARGS:                  return "VAR_ARGS";
 241         case CRITICAL:                  return "CRITICAL";
 242         case NONBANKED:                 return "NONBANKED";
 243         case BANKED:                    return "BANKED";
 244         case CHAR:                      return "CHAR";
 245         case SHORT:                     return "SHORT";
 246         case INT:                       return "INT";
 247         case LONG:                      return "LONG";
 248         case SIGNED:                    return "SIGNED";
 249         case UNSIGNED:                  return "UNSIGNED";
 250         case FLOAT:                     return "FLOAT";
 251         case DOUBLE:                    return "DOUBLE";
 252         case CONST:                     return "CONST";
 253         case VOLATILE:                  return "VOLATILE";
 254         case VOID:                      return "VOID";
 255         case BIT:                       return "BIT";
 256         case STRUCT:                    return "STRUCT";
 257         case UNION:                     return "UNION";
 258         case ENUM:                      return "ENUM";
 259         case ELIPSIS:                   return "ELIPSIS";
 260         case RANGE:                     return "RANGE";
 261         case FAR:                       return "FAR";
 262         case CASE:                      return "CASE";
 263         case DEFAULT:                   return "DEFAULT";
 264         case IF:                        return "IF";
 265         case ELSE:                      return "ELSE";
 266         case SWITCH:                    return "SWITCH";
 267         case WHILE:                     return "WHILE";
 268         case DO:                        return "DO";
 269         case FOR:                       return "FOR";
 270         case GOTO:                      return "GOTO";
 271         case CONTINUE:                  return "CONTINUE";
 272         case BREAK:                     return "BREAK";
 273         case RETURN:                    return "RETURN";
 274         case INLINEASM:                 return "INLINEASM";
 275         case IFX:                       return "IFX";
 276         case ADDRESS_OF:                return "ADDRESS_OF";
 277         case GET_VALUE_AT_ADDRESS:      return "GET_VALUE_AT_ADDRESS";
 278         case SPIL:                      return "SPIL";
 279         case UNSPIL:                    return "UNSPIL";
 280         case GETHBIT:                   return "GETHBIT";
 281         case BITWISEAND:                return "BITWISEAND";
 282         case UNARYMINUS:                return "UNARYMINUS";
 283         case IPUSH:                     return "IPUSH";
 284         case IPOP:                      return "IPOP";
 285         case PCALL:                     return "PCALL";
 286         case ENDFUNCTION:               return "ENDFUNCTION";
 287         case JUMPTABLE:                 return "JUMPTABLE";
 288         case RRC:                       return "RRC";
 289         case RLC:                       return "RLC";
 290         case CAST:                      return "CAST";
 291         case CALL:                      return "CALL";
 292         case PARAM:                     return "PARAM  ";
 293         case NULLOP:                    return "NULLOP";
 294         case BLOCK:                     return "BLOCK";
 295         case LABEL:                     return "LABEL";
 296         case RECEIVE:                   return "RECEIVE";
 297         case SEND:                      return "SEND";
 298         }
 299         sprintf (buffer, "unknown op %d %c", op, op & 0xff);
 300         return buffer;
 301 }
 302 /*-----------------------------------------------------------------*/
 303 /*-----------------------------------------------------------------*/
 304 static char *
 305 debugLogRegType (short type)
 306 {
 307
 308         switch (type)
 309         {
 310         case REG_GPR:   return "REG_GPR";
 311         case REG_PTR:   return "REG_PTR";
 312         case REG_CND:   return "REG_CND";
 313         }
 314
 315         sprintf (buffer, "unknown reg type %d", type);
 316         return buffer;
 317 }
 318
 319 /*-----------------------------------------------------------------*/
 320 /*-----------------------------------------------------------------*/
 321 static int regname2key(char const *name)
 322 {
 323         int key = 0;
 324
 325         if(!name)
 326                 return 0;
 327
 328         while(*name) {
 329
 330                 key += (*name++) + 1;
 331
 332         }
 333
 334         return ( (key + (key >> 4) + (key>>8)) & 0x3f);
 335
 336 }
 337
 338 static regs *regWithIdx (set *dRegs, int idx, int fixed);
 339 /*-----------------------------------------------------------------*/
 340 /* newReg - allocate and init memory for a new register            */
 341 /*-----------------------------------------------------------------*/
 342 static regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias)
 343 {
 344
 345         regs *dReg;
 346
 347         /* check whether a matching register already exists */
 348         dReg = dirregWithName( name );
 349         if (dReg) {
 350           //printf( "%s: already present: %s\n", __FUNCTION__, name );
 351           return (dReg);
 352         }
 353         dReg = regWithIdx( dynDirectRegs, rIdx, 0 );
 354         if (!dReg) dReg = regWithIdx( dynDirectRegs, rIdx, 1 );
 355         if (dReg)
 356         {
 357           //printf(  "%s: already present %s (idx:%d/%x)", __FUNCTION__, name, rIdx, rIdx );
 358           return (dReg);
 359         }
 360
 361         dReg = Safe_calloc(1,sizeof(regs));
 362         dReg->type = type;
 363         dReg->pc_type = pc_type;
 364         dReg->rIdx = rIdx;
 365         if(name) {
 366                 dReg->name = Safe_strdup(name);
 367         } else {
 368                 sprintf(buffer,"r0x%02X", dReg->rIdx);
 369                 dReg->name = Safe_strdup(buffer);
 370         }
 371         dReg->isFree = 0;
 372         dReg->wasUsed = 1;
 373         if (type == REG_SFR)
 374                 dReg->isFixed = 1;
 375         else
 376                 dReg->isFixed = 0;
 377
 378         dReg->isMapped = 0;
 379         dReg->isEmitted = 0;
 380         dReg->isPublic = 0;
 381         dReg->isExtern = 0;
 382         dReg->address = 0;
 383         dReg->size = size;
 384         dReg->alias = alias;
 385         dReg->reg_alias = NULL;
 386         dReg->reglives.usedpFlows = newSet();
 387         dReg->reglives.assignedpFlows = newSet();
 388
 389         hTabAddItem(&dynDirectRegNames, regname2key(name), dReg);
 390
 391         return dReg;
 392 }
 393
 394 /*-----------------------------------------------------------------*/
 395 /* regWithIdx - Search through a set of registers that matches idx */
 396 /*-----------------------------------------------------------------*/
 397 static regs *
 398 regWithIdx (set *dRegs, int idx, int fixed)
 399 {
 400         regs *dReg;
 401
 402         for (dReg = setFirstItem(dRegs) ; dReg ;
 403         dReg = setNextItem(dRegs)) {
 404
 405                 if(idx == dReg->rIdx && (fixed == (int)dReg->isFixed)) {
 406                         return dReg;
 407                 }
 408         }
 409
 410         return NULL;
 411 }
 412
 413 /*-----------------------------------------------------------------*/
 414 /* regWithName - Search through a set of registers that matches name */
 415 /*-----------------------------------------------------------------*/
 416 static regs *
 417 regWithName (set *dRegs, const char *name)
 418 {
 419         regs *dReg;
 420
 421         for (dReg = setFirstItem(dRegs) ; dReg ;
 422         dReg = setNextItem(dRegs)) {
 423
 424                 if((strcmp(name,dReg->name)==0)) {
 425                         return dReg;
 426                 }
 427         }
 428
 429         return NULL;
 430 }
 431
 432 /*-----------------------------------------------------------------*/
 433 /* regWithName - Search for a registers that matches name          */
 434 /*-----------------------------------------------------------------*/
 435 regs *
 436 regFindWithName (const char *name)
 437 {
 438         regs *dReg;
 439
 440         if( (dReg = regWithName ( dynDirectRegs, name)) != NULL ) {
 441                 debugLog ("Found a Direct Register!\n");
 442                 return dReg;
 443         }
 444         if( (dReg = regWithName ( dynDirectBitRegs, name)) != NULL) {
 445                 debugLog ("Found a Direct Bit Register!\n");
 446                 return dReg;
 447         }
 448
 449         if (*name=='_') name++; // Step passed '_'
 450
 451         if( (dReg = regWithName ( dynAllocRegs, name)) != NULL) {
 452                 debugLog ("Found a Dynamic Register!\n");
 453                 return dReg;
 454         }
 455         if( (dReg = regWithName ( dynProcessorRegs, name)) != NULL) {
 456                 debugLog ("Found a Processor Register!\n");
 457                 return dReg;
 458         }
 459         if( (dReg = regWithName ( dynInternalRegs, name)) != NULL) {
 460                 debugLog ("Found an Internal Register!\n");
 461                 return dReg;
 462         }
 463         if( (dReg = regWithName ( dynStackRegs, name)) != NULL) {
 464                 debugLog ("Found an Stack Register!\n");
 465                 return dReg;
 466         }
 467
 468         return NULL;
 469 }
 470
 471 /*-----------------------------------------------------------------*/
 472 /* regFindFree - Search for a free register in a set of registers  */
 473 /*-----------------------------------------------------------------*/
 474 static regs *
 475 regFindFree (set *dRegs)
 476 {
 477         regs *dReg;
 478
 479         for (dReg = setFirstItem(dRegs) ; dReg ;
 480         dReg = setNextItem(dRegs)) {
 481
 482                 if(dReg->isFree)
 483                         return dReg;
 484         }
 485
 486         return NULL;
 487 }
 488 /*-----------------------------------------------------------------*/
 489 /* initStack - allocate registers for a psuedo stack               */
 490 /*-----------------------------------------------------------------*/
 491 void initStack(int base_address, int size)
 492 {
 493
 494         int i;
 495
 496         Gstack_base_addr = base_address;
 497         Gstack_size = size;
 498         //fprintf(stderr,"initStack [base:0x%02x, size:%d]\n", base_address, size);
 499
 500         for(i = 0; i<size; i++) {
 501                 char buffer[16];
 502                 regs *r;
 503                 SNPRINTF(&buffer[0], 16, "STK%02d", i);
 504                 r = newReg(REG_STK, PO_GPR_TEMP,base_address,buffer,1,0);
 505                 r->address = base_address; // Pseudo stack needs a fixed location that can be known by all modules
 506                 r->isFixed = 1;
 507                 r->isPublic = 1;
 508                 //r->name[0] = 's';
 509                 r->alias = 0x180; // Using shared memory for pseudo stack
 510                 addSet(&dynStackRegs,r);
 511                 base_address--;
 512         }
 513 }
 514
 515 /*-----------------------------------------------------------------*
 516 *-----------------------------------------------------------------*/
 517 regs *
 518 allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
 519 {
 520
 521         //fprintf(stderr,"allocProcessorRegister %s addr =0x%x\n",name,rIdx);
 522         return addSet(&dynProcessorRegs,newReg(REG_SFR, po_type, rIdx, name,1,alias));
 523 }
 524
 525 /*-----------------------------------------------------------------*
 526 *-----------------------------------------------------------------*/
 527
 528 regs *
 529 allocInternalRegister(int rIdx, char * name, short po_type, int alias)
 530 {
 531         regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias);
 532
 533         //fprintf(stderr,"allocInternalRegister %s addr =0x%x\n",name,rIdx);
 534         if(reg) {
 535                 reg->wasUsed = 0;
 536                 return addSet(&dynInternalRegs,reg);
 537         }
 538
 539         return NULL;
 540 }
 541 /*-----------------------------------------------------------------*/
 542 /* allocReg - allocates register of given type                     */
 543 /*-----------------------------------------------------------------*/
 544 static regs *
 545 allocReg (short type)
 546 {
 547         regs *reg;
 548
 549         debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
 550         //fprintf(stderr,"allocReg\n");
 551
 552         reg = pic14_findFreeReg (type);
 553
 554         reg->isFree = 0;
 555         reg->wasUsed = 1;
 556
 557         return reg;
 558
 559
 560         //return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
 561
 562 }
 563
 564
 565 /*-----------------------------------------------------------------*/
 566 /* dirregWithName - search for register by name                    */
 567 /*-----------------------------------------------------------------*/
 568 regs *
 569 dirregWithName (char *name)
 570 {
 571         int hkey;
 572         regs *reg;
 573
 574         if(!name)
 575                 return NULL;
 576
 577         /* hash the name to get a key */
 578
 579         hkey = regname2key(name);
 580
 581         reg = hTabFirstItemWK(dynDirectRegNames, hkey);
 582
 583         while(reg) {
 584
 585                 if(STRCASECMP(reg->name, name) == 0) {
 586                         return(reg);
 587                 }
 588
 589                 reg = hTabNextItemWK (dynDirectRegNames);
 590
 591         }
 592
 593         return NULL; // name wasn't found in the hash table
 594 }
 595
 596 int IS_CONFIG_ADDRESS(int address)
 597 {
 598
 599         return address == 0x2007;
 600 }
 601
 602 /*-----------------------------------------------------------------*/
 603 /* allocNewDirReg - allocates a new register of given type         */
 604 /*-----------------------------------------------------------------*/
 605 regs *
 606 allocNewDirReg (sym_link *symlnk,const char *name)
 607 {
 608         regs *reg;
 609         int address = 0;
 610         sym_link *spec = getSpec (symlnk);
 611
 612         /* if this is at an absolute address, then get the address. */
 613         if (SPEC_ABSA (spec) ) {
 614                 address = SPEC_ADDR (spec);
 615                 //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
 616         }
 617
 618         /* Register wasn't found in hash, so let's create
 619         * a new one and put it in the hash table AND in the
 620         * dynDirectRegNames set */
 621         if (IS_CONFIG_ADDRESS(address)) {
 622                 debugLog ("  -- %s is declared at address 0x2007\n",name);
 623                 reg = 0;
 624         } else {
 625                 int idx;
 626                 if (address) {
 627                         if (IS_BITVAR (spec))
 628                                 idx = address >> 3;
 629                         else
 630                                 idx = address;
 631                 } else {
 632                         idx = rDirectIdx++;
 633                 }
 634                 reg = newReg(REG_GPR, PO_DIR, idx, (char*)name,getSize (symlnk),0 );
 635                 debugLog ("  -- added %s to hash, size = %d\n", (char*)name,reg->size);
 636
 637                 if (SPEC_ABSA (spec) ) {
 638                         reg->type = REG_SFR;
 639                 }
 640
 641                 if (IS_BITVAR (spec)) {
 642                         addSet(&dynDirectBitRegs, reg);
 643                         reg->isBitField = 1;
 644                 } else
 645                         addSet(&dynDirectRegs, reg);
 646
 647                 if (!IS_STATIC (spec)) {
 648                         reg->isPublic = 1;
 649                 }
 650                 if (IS_EXTERN (spec)) {
 651                         reg->isExtern = 1;
 652                 }
 653
 654         }
 655
 656         if (address && reg) {
 657                 reg->isFixed = 1;
 658                 reg->address = address;
 659                 debugLog ("  -- and it is at a fixed address 0x%02x\n",reg->address);
 660         }
 661
 662         return reg;
 663 }
 664
 665 /*-----------------------------------------------------------------*/
 666 /* allocDirReg - allocates register of given type                  */
 667 /*-----------------------------------------------------------------*/
 668 regs *
 669 allocDirReg (operand *op )
 670 {
 671
 672         regs *reg;
 673         char *name;
 674
 675         if(!IS_SYMOP(op)) {
 676                 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
 677                 return NULL;
 678         }
 679
 680         name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
 681
 682         /* If the symbol is at a fixed address, then remove the leading underscore
 683         * from the name. This is hack to allow the .asm include file named registers
 684         * to match the .c declared register names */
 685
 686         //if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && (*name == '_'))
 687         //name++;
 688
 689         debugLog ("%s symbol name %s\n", __FUNCTION__,name);
 690         {
 691                 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
 692                         debugLog(" %d  const char\n",__LINE__);
 693                         debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
 694                 }
 695
 696                 debugLog("  %d  storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
 697                 if (IS_CODE ( OP_SYM_ETYPE(op)) )
 698                         debugLog(" %d  code space\n",__LINE__);
 699
 700                 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
 701                         debugLog(" %d  integral\n",__LINE__);
 702                 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
 703                         debugLog(" %d  literal\n",__LINE__);
 704                 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
 705                         debugLog(" %d  specifier\n",__LINE__);
 706                 debugAopGet(NULL, op);
 707         }
 708
 709         if (IS_CODE ( OP_SYM_ETYPE(op)) )
 710                 return NULL;
 711
 712         /* First, search the hash table to see if there is a register with this name */
 713         if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && !(IS_BITVAR (OP_SYM_ETYPE(op))) ) {
 714                 reg = regWithIdx (dynProcessorRegs, SPEC_ADDR ( OP_SYM_ETYPE(op)), 1);
 715                 /*
 716                 if(!reg)
 717                 fprintf(stderr,"ralloc %s is at fixed address but not a processor reg, addr=0x%x\n",
 718                 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
 719                 else
 720                 fprintf(stderr,"ralloc %s at fixed address has already been declared, addr=0x%x\n",
 721                 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
 722                 */
 723         } else {
 724                 //fprintf(stderr,"ralloc:%d %s \n", __LINE__,name);
 725
 726                 reg = dirregWithName(name);
 727         }
 728
 729 #if 0
 730         if(!reg) {
 731                 int address = 0;
 732
 733                 /* if this is at an absolute address, then get the address. */
 734                 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 735                         address = SPEC_ADDR ( OP_SYM_ETYPE(op));
 736                         //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
 737                 }
 738
 739                 /* Register wasn't found in hash, so let's create
 740                 * a new one and put it in the hash table AND in the
 741                 * dynDirectRegNames set */
 742                 if(!IS_CONFIG_ADDRESS(address)) {
 743                         //fprintf(stderr,"allocating new reg %s\n",name);
 744
 745                         reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0 );
 746                         debugLog ("  -- added %s to hash, size = %d\n", name,reg->size);
 747
 748                         //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
 749
 750                         if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 751
 752                                 //fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
 753                                 reg->type = REG_SFR;
 754                         }
 755
 756                         if (IS_BITVAR (OP_SYM_ETYPE(op))) {
 757                                 addSet(&dynDirectBitRegs, reg);
 758                                 reg->isBitField = 1;
 759                         } else
 760                                 addSet(&dynDirectRegs, reg);
 761
 762                         if (!IS_STATIC (OP_SYM_ETYPE(op))) {
 763                                 reg->isPublic = 1;
 764                         }
 765                         if (IS_EXTERN (OP_SYM_ETYPE(op))) {
 766                                 reg->isExtern = 1;
 767                         }
 768
 769
 770                 } else {
 771                         debugLog ("  -- %s is declared at address 0x2007\n",name);
 772
 773                 }
 774         }
 775
 776         if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 777                 reg->isFixed = 1;
 778                 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
 779                 debugLog ("  -- and it is at a fixed address 0x%02x\n",reg->address);
 780         }
 781 #endif
 782
 783         if(reg) {
 784                 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
 785                         reg->isFixed = 1;
 786                         reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
 787                         debugLog ("  -- and it is at a fixed address 0x%02x\n",reg->address);
 788                 }
 789         } else {
 790                 allocNewDirReg (OP_SYM_TYPE(op),name);
 791         }
 792
 793         return reg;
 794 }
 795
 796
 797 /*-----------------------------------------------------------------*/
 798 /* allocRegByName - allocates register with given name             */
 799 /*-----------------------------------------------------------------*/
 800 regs *
 801 allocRegByName (char *name, int size)
 802 {
 803
 804         regs *reg;
 805
 806         if(!name) {
 807                 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
 808                 exit(1);
 809         }
 810
 811         /* First, search the hash table to see if there is a register with this name */
 812         reg = dirregWithName(name);
 813
 814
 815         if(!reg) {
 816                 int found = 0;
 817                 symbol *sym;
 818                 /* Register wasn't found in hash, so let's create
 819                 * a new one and put it in the hash table AND in the
 820                 * dynDirectRegNames set */
 821                 //fprintf (stderr,"%s symbol name %s, size:%d\n", __FUNCTION__,name,size);
 822                 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0 );
 823                 for (sym = setFirstItem(sfr->syms); sym; sym = setNextItem(sfr->syms)) {
 824                         if (strcmp(reg->name+1,sym->name)==0) {
 825                                 unsigned a = SPEC_ADDR(sym->etype);
 826                                 reg->address = a;
 827                                 reg->isFixed = 1;
 828                                 reg->type = REG_SFR;
 829                                 if (!IS_STATIC (sym->etype)) {
 830                                         reg->isPublic = 1;
 831                                 }
 832                                 if (IS_EXTERN (sym->etype)) {
 833                                         reg->isExtern = 1;
 834                                 }
 835                                 if (IS_BITVAR (sym->etype))
 836                                         reg->isBitField = 1;
 837                                 found = 1;
 838                                 break;
 839                         }
 840                 }
 841                 if (!found) {
 842                         for (sym = setFirstItem(data->syms); sym; sym = setNextItem(data->syms)) {
 843                                 if (strcmp(reg->name+1,sym->name)==0) {
 844                                         unsigned a = SPEC_ADDR(sym->etype);
 845                                         reg->address = a;
 846                                         if (!IS_STATIC (sym->etype)) {
 847                                                 reg->isPublic = 1;
 848                                         }
 849                                         if (IS_EXTERN (sym->etype)) {
 850                                                 reg->isExtern = 1;
 851                                         }
 852                                         if (IS_BITVAR (sym->etype))
 853                                                 reg->isBitField = 1;
 854                                         found = 1;
 855                                         break;
 856                                 }
 857                         }
 858                 }
 859
 860                 debugLog ("  -- added %s to hash, size = %d\n", name,reg->size);
 861
 862                 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
 863                 if (reg->isBitField) {
 864                         addSet(&dynDirectBitRegs, reg);
 865                 } else
 866                         addSet(&dynDirectRegs, reg);
 867         }
 868
 869         return reg;
 870 }
 871
 872 /*-----------------------------------------------------------------*/
 873 /* RegWithIdx - returns pointer to register with index number       */
 874 /*-----------------------------------------------------------------*/
 875 regs *
 876 typeRegWithIdx (int idx, int type, int fixed)
 877 {
 878
 879         regs *dReg;
 880
 881         debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
 882
 883         switch (type) {
 884
 885         case REG_GPR:
 886                 if( (dReg = regWithIdx ( dynAllocRegs, idx, fixed)) != NULL) {
 887
 888                         debugLog ("Found a Dynamic Register!\n");
 889                         return dReg;
 890                 }
 891                 if( (dReg = regWithIdx ( dynDirectRegs, idx, fixed)) != NULL ) {
 892                         debugLog ("Found a Direct Register!\n");
 893                         return dReg;
 894                 }
 895
 896                 break;
 897         case REG_STK:
 898                 if( (dReg = regWithIdx ( dynStackRegs, idx, fixed)) != NULL ) {
 899                         debugLog ("Found a Stack Register!\n");
 900                         return dReg;
 901                 }
 902                 else {
 903                   werror (E_STACK_OUT, "Register");
 904                   /* return an existing register just to avoid the SDCC crash */
 905                   return regWithIdx ( dynStackRegs, 0x7f, fixed);
 906                 }
 907                 break;
 908         case REG_SFR:
 909                 if( (dReg = regWithIdx ( dynProcessorRegs, idx, fixed)) != NULL ) {
 910                         debugLog ("Found a Processor Register!\n");
 911                         return dReg;
 912                 }
 913
 914         case REG_CND:
 915         case REG_PTR:
 916         default:
 917                 break;
 918         }
 919
 920
 921         return NULL;
 922 }
 923
 924 /*-----------------------------------------------------------------*/
 925 /* pic14_regWithIdx - returns pointer to register with index number*/
 926 /*-----------------------------------------------------------------*/
 927 regs *
 928 pic14_regWithIdx (int idx)
 929 {
 930         regs *dReg;
 931
 932         if( (dReg = typeRegWithIdx(idx,REG_GPR,0)) != NULL)
 933                 return dReg;
 934
 935         if( (dReg = typeRegWithIdx(idx,REG_SFR,0)) != NULL)
 936                 return dReg;
 937
 938         return NULL;
 939 }
 940
 941 /*-----------------------------------------------------------------*/
 942 /* pic14_regWithIdx - returns pointer to register with index number       */
 943 /*-----------------------------------------------------------------*/
 944 regs *
 945 pic14_allocWithIdx (int idx)
 946 {
 947
 948         regs *dReg;
 949
 950         debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
 951
 952         if( (dReg = regWithIdx ( dynAllocRegs, idx,0)) != NULL) {
 953
 954                 debugLog ("Found a Dynamic Register!\n");
 955         } else if( (dReg = regWithIdx ( dynStackRegs, idx,0)) != NULL ) {
 956                 debugLog ("Found a Stack Register!\n");
 957         } else if( (dReg = regWithIdx ( dynProcessorRegs, idx,0)) != NULL ) {
 958                 debugLog ("Found a Processor Register!\n");
 959         } else if( (dReg = regWithIdx ( dynInternalRegs, idx,0)) != NULL ) {
 960                 debugLog ("Found an Internal Register!\n");
 961         } else if( (dReg = regWithIdx ( dynInternalRegs, idx,1)) != NULL ) {
 962                 debugLog ("Found an Internal Register!\n");
 963         } else {
 964
 965                 debugLog ("Dynamic Register not found\n");
 966
 967
 968                 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
 969                 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
 970                         "regWithIdx not found");
 971                 exit (1);
 972
 973         }
 974
 975         dReg->wasUsed = 1;
 976         dReg->isFree = 0;
 977
 978         return dReg;
 979 }
 980 /*-----------------------------------------------------------------*/
 981 /*-----------------------------------------------------------------*/
 982 regs *
 983 pic14_findFreeReg(short type)
 984 {
 985         //  int i;
 986         regs* dReg;
 987
 988         switch (type) {
 989         case REG_GPR:
 990                 if((dReg = regFindFree(dynAllocRegs)) != NULL)
 991                         return dReg;
 992                 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
 993
 994         case REG_STK:
 995
 996                 if((dReg = regFindFree(dynStackRegs)) != NULL)
 997                         return dReg;
 998
 999                 return NULL;
1000
1001         case REG_PTR:
1002         case REG_CND:
1003         case REG_SFR:
1004         default:
1005                 return NULL;
1006         }
1007 }
1008 /*-----------------------------------------------------------------*/
1009 /* freeReg - frees a register                                      */
1010 /*-----------------------------------------------------------------*/
1011 static void
1012 freeReg (regs * reg)
1013 {
1014         debugLog ("%s\n", __FUNCTION__);
1015         reg->isFree = 1;
1016 }
1017
1018
1019 /*-----------------------------------------------------------------*/
1020 /* nFreeRegs - returns number of free registers                    */
1021 /*-----------------------------------------------------------------*/
1022 static int
1023 nFreeRegs (int type)
1024 {
1025 /* dynamically allocate as many as we need and worry about
1026         * fitting them into a PIC later */
1027
1028         return 100;
1029 #if 0
1030         int i;
1031         int nfr = 0;
1032
1033         debugLog ("%s\n", __FUNCTION__);
1034         for (i = 0; i < pic14_nRegs; i++)
1035                 if (regspic14[i].isFree && regspic14[i].type == type)
1036                         nfr++;
1037                 return nfr;
1038 #endif
1039 }
1040
1041 /*-----------------------------------------------------------------*/
1042 /* nfreeRegsType - free registers with type                         */
1043 /*-----------------------------------------------------------------*/
1044 static int
1045 nfreeRegsType (int type)
1046 {
1047         int nfr;
1048         debugLog ("%s\n", __FUNCTION__);
1049         if (type == REG_PTR)
1050         {
1051                 if ((nfr = nFreeRegs (type)) == 0)
1052                         return nFreeRegs (REG_GPR);
1053         }
1054
1055         return nFreeRegs (type);
1056 }
1057
1058 void writeSetUsedRegs(FILE *of, set *dRegs)
1059 {
1060
1061         regs *dReg;
1062
1063         for (dReg = setFirstItem(dRegs) ; dReg ;
1064         dReg = setNextItem(dRegs)) {
1065
1066                 if(dReg->wasUsed)
1067                         fprintf (of, "\t%s\n",dReg->name);
1068         }
1069
1070 }
1071 extern void assignFixedRegisters(set *regset);
1072 extern void assignRelocatableRegisters(set *regset,int used);
1073 extern void dump_map(void);
1074 extern void dump_sfr(FILE *of);
1075
1076 void packBits(set *bregs)
1077 {
1078         set *regset;
1079         regs *breg;
1080         regs *bitfield=NULL;
1081         regs *relocbitfield=NULL;
1082         int bit_no=0;
1083         int byte_no=-1;
1084         char buffer[20];
1085
1086
1087         for (regset = bregs ; regset ;
1088         regset = regset->next) {
1089
1090                 breg = regset->item;
1091                 breg->isBitField = 1;
1092                 //fprintf(stderr,"bit reg: %s\n",breg->name);
1093
1094                 if(breg->isFixed) {
1095                         //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
1096
1097                         bitfield = typeRegWithIdx (breg->address >> 3, -1 , 1);
1098                         breg->rIdx = breg->address & 7;
1099                         breg->address >>= 3;
1100
1101                         if(!bitfield) {
1102                                 //sprintf (buffer, "fbitfield%02x", breg->address);
1103                                 sprintf (buffer, "0x%02x", breg->address);
1104                                 //fprintf(stderr,"new bit field\n");
1105                                 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0);
1106                                 bitfield->isBitField = 1;
1107                                 bitfield->isFixed = 1;
1108                                 bitfield->address = breg->address;
1109                                 //addSet(&dynDirectRegs,bitfield);
1110                                 addSet(&dynInternalRegs,bitfield);
1111                                 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
1112                         } else {
1113                                 //fprintf(stderr,"  which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
1114                                 ;
1115                         }
1116                         breg->reg_alias = bitfield;
1117                         bitfield = NULL;
1118
1119                 } else {
1120                         if(!relocbitfield || bit_no >7) {
1121                                 byte_no++;
1122                                 bit_no=0;
1123                                 sprintf (buffer, "bitfield%d", byte_no);
1124                                 //fprintf(stderr,"new relocatable bit field\n");
1125                                 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0);
1126                                 relocbitfield->isBitField = 1;
1127                                 //addSet(&dynDirectRegs,relocbitfield);
1128                                 addSet(&dynInternalRegs,relocbitfield);
1129                                 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1130
1131                         }
1132
1133                         breg->reg_alias = relocbitfield;
1134                         breg->address = rDirectIdx;   /* byte_no; */
1135                         breg->rIdx = bit_no++;
1136                 }
1137         }
1138
1139 }
1140
1141
1142
1143 void bitEQUs(FILE *of, set *bregs)
1144 {
1145         regs *breg,*bytereg;
1146         int bit_no=0;
1147
1148         //fprintf(stderr," %s\n",__FUNCTION__);
1149         for (breg = setFirstItem(bregs) ; breg ;
1150         breg = setNextItem(bregs)) {
1151
1152                 //fprintf(stderr,"bit reg: %s\n",breg->name);
1153
1154                 bytereg = breg->reg_alias;
1155                 if(bytereg)
1156                         fprintf (of, "%s\tEQU\t( (%s<<3)+%d)\n",
1157                         breg->name,
1158                         bytereg->name,
1159                         breg->rIdx & 0x0007);
1160
1161                 else {
1162                         //fprintf(stderr, "bit field is not assigned to a register\n");
1163                         fprintf (of, "%s\tEQU\t( (bitfield%d<<3)+%d)\n",
1164                                 breg->name,
1165                                 bit_no>>3,
1166                                 bit_no & 0x0007);
1167
1168                         bit_no++;
1169                 }
1170         }
1171
1172 }
1173 void aliasEQUs(FILE *of, set *fregs, int use_rIdx)
1174 {
1175         regs *reg;
1176
1177
1178         for (reg = setFirstItem(fregs) ; reg ;
1179         reg = setNextItem(fregs)) {
1180
1181                 //if(!reg->isEmitted && reg->wasUsed) {
1182                 if(reg->wasUsed) {
1183                         if(use_rIdx)
1184                                 fprintf (of, "%s\tEQU\t0x%03x\n",
1185                                 reg->name,
1186                                 reg->rIdx);
1187                         else
1188                                 fprintf (of, "%s\tEQU\t0x%03x\n",
1189                                 reg->name,
1190                                 reg->address);
1191                 }
1192         }
1193
1194 }
1195
1196 void writeUsedRegs(FILE *of)
1197 {
1198         packBits(dynDirectBitRegs);
1199
1200         assignFixedRegisters(dynInternalRegs);
1201         assignFixedRegisters(dynAllocRegs);
1202         assignFixedRegisters(dynStackRegs);
1203         assignFixedRegisters(dynDirectRegs);
1204
1205         assignRelocatableRegisters(dynInternalRegs,0);
1206         assignRelocatableRegisters(dynAllocRegs,0);
1207         assignRelocatableRegisters(dynStackRegs,0);
1208
1209         assignRelocatableRegisters(dynDirectRegs,0);
1210         /*
1211         assignRelocatableRegisters(dynDirectRegs,0);
1212         printf("assignRelocatableRegisters(dynDirectRegs,0);\n");
1213         */
1214         //dump_map();
1215
1216         dump_sfr(of);
1217         bitEQUs(of,dynDirectBitRegs);
1218         /*
1219         aliasEQUs(of,dynAllocRegs,0);
1220         aliasEQUs(of,dynDirectRegs,0);
1221         aliasEQUs(of,dynStackRegs,0);
1222         aliasEQUs(of,dynProcessorRegs,1);
1223         */
1224 }
1225
1226 #if 0
1227 /*-----------------------------------------------------------------*/
1228 /* allDefsOutOfRange - all definitions are out of a range          */
1229 /*-----------------------------------------------------------------*/
1230 static bool
1231 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
1232 {
1233         int i;
1234
1235         debugLog ("%s\n", __FUNCTION__);
1236         if (!defs)
1237                 return TRUE;
1238
1239         for (i = 0; i < defs->size; i++)
1240         {
1241                 iCode *ic;
1242
1243                 if (bitVectBitValue (defs, i) &&
1244                         (ic = hTabItemWithKey (iCodehTab, i)) &&
1245                         (ic->seq >= fseq && ic->seq <= toseq))
1246
1247                         return FALSE;
1248
1249         }
1250
1251         return TRUE;
1252 }
1253 #endif
1254
1255 /*-----------------------------------------------------------------*/
1256 /* computeSpillable - given a point find the spillable live ranges */
1257 /*-----------------------------------------------------------------*/
1258 static bitVect *
1259 computeSpillable (iCode * ic)
1260 {
1261         bitVect *spillable;
1262
1263         debugLog ("%s\n", __FUNCTION__);
1264         /* spillable live ranges are those that are live at this
1265         point . the following categories need to be subtracted
1266         from this set.
1267         a) - those that are already spilt
1268         b) - if being used by this one
1269         c) - defined by this one */
1270
1271         spillable = bitVectCopy (ic->rlive);
1272         spillable =
1273                 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1274         spillable =
1275                 bitVectCplAnd (spillable, ic->uses);    /* used in this one */
1276         bitVectUnSetBit (spillable, ic->defKey);
1277         spillable = bitVectIntersect (spillable, _G.regAssigned);
1278         return spillable;
1279
1280 }
1281
1282 /*-----------------------------------------------------------------*/
1283 /* noSpilLoc - return true if a variable has no spil location      */
1284 /*-----------------------------------------------------------------*/
1285 static int
1286 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1287 {
1288         debugLog ("%s\n", __FUNCTION__);
1289         return (sym->usl.spillLoc ? 0 : 1);
1290 }
1291
1292 /*-----------------------------------------------------------------*/
1293 /* hasSpilLoc - will return 1 if the symbol has spil location      */
1294 /*-----------------------------------------------------------------*/
1295 static int
1296 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1297 {
1298         debugLog ("%s\n", __FUNCTION__);
1299         return (sym->usl.spillLoc ? 1 : 0);
1300 }
1301
1302 /*-----------------------------------------------------------------*/
1303 /* directSpilLoc - will return 1 if the splilocation is in direct  */
1304 /*-----------------------------------------------------------------*/
1305 static int
1306 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1307 {
1308         debugLog ("%s\n", __FUNCTION__);
1309         if (sym->usl.spillLoc &&
1310                 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1311                 return 1;
1312         else
1313                 return 0;
1314 }
1315
1316 /*-----------------------------------------------------------------*/
1317 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1318 /*                    but is not used as a pointer                 */
1319 /*-----------------------------------------------------------------*/
1320 static int
1321 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1322 {
1323         debugLog ("%s\n", __FUNCTION__);
1324         return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1325 }
1326
1327 /*-----------------------------------------------------------------*/
1328 /* rematable - will return 1 if the remat flag is set              */
1329 /*-----------------------------------------------------------------*/
1330 static int
1331 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1332 {
1333         debugLog ("%s\n", __FUNCTION__);
1334         return sym->remat;
1335 }
1336
1337 /*-----------------------------------------------------------------*/
1338 /* notUsedInRemaining - not used or defined in remain of the block */
1339 /*-----------------------------------------------------------------*/
1340 static int
1341 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1342 {
1343         debugLog ("%s\n", __FUNCTION__);
1344         return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1345                 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1346 }
1347
1348 /*-----------------------------------------------------------------*/
1349 /* allLRs - return true for all                                    */
1350 /*-----------------------------------------------------------------*/
1351 static int
1352 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1353 {
1354         debugLog ("%s\n", __FUNCTION__);
1355         return 1;
1356 }
1357
1358 /*-----------------------------------------------------------------*/
1359 /* liveRangesWith - applies function to a given set of live range  */
1360 /*-----------------------------------------------------------------*/
1361 static set *
1362 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1363                                 eBBlock * ebp, iCode * ic)
1364 {
1365         set *rset = NULL;
1366         int i;
1367
1368         debugLog ("%s\n", __FUNCTION__);
1369         if (!lrs || !lrs->size)
1370                 return NULL;
1371
1372         for (i = 1; i < lrs->size; i++)
1373         {
1374                 symbol *sym;
1375                 if (!bitVectBitValue (lrs, i))
1376                         continue;
1377
1378                 /* if we don't find it in the live range
1379                 hash table we are in serious trouble */
1380                 if (!(sym = hTabItemWithKey (liveRanges, i)))
1381                 {
1382                         werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1383                                 "liveRangesWith could not find liveRange");
1384                         exit (1);
1385                 }
1386
1387                 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1388                         addSetHead (&rset, sym);
1389         }
1390
1391         return rset;
1392 }
1393
1394
1395 /*-----------------------------------------------------------------*/
1396 /* leastUsedLR - given a set determines which is the least used    */
1397 /*-----------------------------------------------------------------*/
1398 static symbol *
1399 leastUsedLR (set * sset)
1400 {
1401         symbol *sym = NULL, *lsym = NULL;
1402
1403         debugLog ("%s\n", __FUNCTION__);
1404         sym = lsym = setFirstItem (sset);
1405
1406         if (!lsym)
1407                 return NULL;
1408
1409         for (; lsym; lsym = setNextItem (sset))
1410         {
1411
1412         /* if usage is the same then prefer
1413                 the spill the smaller of the two */
1414                 if (lsym->used == sym->used)
1415                         if (getSize (lsym->type) < getSize (sym->type))
1416                                 sym = lsym;
1417
1418                         /* if less usage */
1419                         if (lsym->used < sym->used)
1420                                 sym = lsym;
1421
1422         }
1423
1424         setToNull ((void *) &sset);
1425         sym->blockSpil = 0;
1426         return sym;
1427 }
1428
1429 /*-----------------------------------------------------------------*/
1430 /* noOverLap - will iterate through the list looking for over lap  */
1431 /*-----------------------------------------------------------------*/
1432 static int
1433 noOverLap (set * itmpStack, symbol * fsym)
1434 {
1435         symbol *sym;
1436         debugLog ("%s\n", __FUNCTION__);
1437
1438
1439         for (sym = setFirstItem (itmpStack); sym;
1440         sym = setNextItem (itmpStack))
1441         {
1442                 if (sym->liveTo > fsym->liveFrom)
1443                         return 0;
1444
1445         }
1446
1447         return 1;
1448 }
1449
1450 /*-----------------------------------------------------------------*/
1451 /* isFree - will return 1 if the a free spil location is found     */
1452 /*-----------------------------------------------------------------*/
1453 static
1454 DEFSETFUNC (isFree)
1455 {
1456         symbol *sym = item;
1457         V_ARG (symbol **, sloc);
1458         V_ARG (symbol *, fsym);
1459
1460         debugLog ("%s\n", __FUNCTION__);
1461         /* if already found */
1462         if (*sloc)
1463                 return 0;
1464
1465                 /* if it is free && and the itmp assigned to
1466                 this does not have any overlapping live ranges
1467                 with the one currently being assigned and
1468         the size can be accomodated  */
1469         if (sym->isFree &&
1470                 noOverLap (sym->usl.itmpStack, fsym) &&
1471                 getSize (sym->type) >= getSize (fsym->type))
1472         {
1473                 *sloc = sym;
1474                 return 1;
1475         }
1476
1477         return 0;
1478 }
1479
1480 /*-----------------------------------------------------------------*/
1481 /* spillLRWithPtrReg :- will spil those live ranges which use PTR  */
1482 /*-----------------------------------------------------------------*/
1483 static void
1484 spillLRWithPtrReg (symbol * forSym)
1485 {
1486         symbol *lrsym;
1487         regs *r0, *r1;
1488         int k;
1489
1490         debugLog ("%s\n", __FUNCTION__);
1491         if (!_G.regAssigned ||
1492                 bitVectIsZero (_G.regAssigned))
1493                 return;
1494
1495         r0 = pic14_regWithIdx (R0_IDX);
1496         r1 = pic14_regWithIdx (R1_IDX);
1497
1498         /* for all live ranges */
1499         for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1500         lrsym = hTabNextItem (liveRanges, &k))
1501         {
1502                 int j;
1503
1504                 /* if no registers assigned to it or
1505                 spilt */
1506                 /* if it does not overlap with this then
1507                 not need to spill it */
1508
1509                 if (lrsym->isspilt || !lrsym->nRegs ||
1510                         (lrsym->liveTo < forSym->liveFrom))
1511                         continue;
1512
1513                         /* go thru the registers : if it is either
1514                 r0 or r1 then spil it */
1515                 for (j = 0; j < lrsym->nRegs; j++)
1516                         if (lrsym->regs[j] == r0 ||
1517                                 lrsym->regs[j] == r1)
1518                         {
1519                                 spillThis (lrsym);
1520                                 break;
1521                         }
1522         }
1523
1524 }
1525
1526 /*-----------------------------------------------------------------*/
1527 /* createStackSpil - create a location on the stack to spil        */
1528 /*-----------------------------------------------------------------*/
1529 static symbol *
1530 createStackSpil (symbol * sym)
1531 {
1532         symbol *sloc = NULL;
1533         int useXstack, model, noOverlay;
1534
1535         char slocBuffer[30];
1536         debugLog ("%s\n", __FUNCTION__);
1537
1538         FENTRY2("called.");
1539
1540         /* first go try and find a free one that is already
1541         existing on the stack */
1542         if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1543         {
1544                 /* found a free one : just update & return */
1545                 sym->usl.spillLoc = sloc;
1546                 sym->stackSpil = 1;
1547                 sloc->isFree = 0;
1548                 addSetHead (&sloc->usl.itmpStack, sym);
1549                 return sym;
1550         }
1551
1552         /* could not then have to create one , this is the hard part
1553         we need to allocate this on the stack : this is really a
1554         hack!! but cannot think of anything better at this time */
1555
1556         if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1557         {
1558                 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1559                         __FILE__, __LINE__);
1560                 exit (1);
1561         }
1562
1563         sloc = newiTemp (slocBuffer);
1564
1565         /* set the type to the spilling symbol */
1566         sloc->type = copyLinkChain (sym->type);
1567         sloc->etype = getSpec (sloc->type);
1568         SPEC_SCLS (sloc->etype) = S_DATA;
1569         SPEC_EXTR (sloc->etype) = 0;
1570         SPEC_STAT (sloc->etype) = 0;
1571
1572         /* we don't allow it to be allocated`
1573         onto the external stack since : so we
1574         temporarily turn it off ; we also
1575         turn off memory model to prevent
1576         the spil from going to the external storage
1577         and turn off overlaying
1578         */
1579
1580         useXstack = options.useXstack;
1581         model = options.model;
1582         noOverlay = options.noOverlay;
1583         options.noOverlay = 1;
1584         options.model = options.useXstack = 0;
1585
1586         allocLocal (sloc);
1587
1588         options.useXstack = useXstack;
1589         options.model = model;
1590         options.noOverlay = noOverlay;
1591         sloc->isref = 1;                /* to prevent compiler warning */
1592
1593         /* if it is on the stack then update the stack */
1594         if (IN_STACK (sloc->etype))
1595         {
1596                 currFunc->stack += getSize (sloc->type);
1597                 _G.stackExtend += getSize (sloc->type);
1598         }
1599         else
1600                 _G.dataExtend += getSize (sloc->type);
1601
1602         /* add it to the _G.stackSpil set */
1603         addSetHead (&_G.stackSpil, sloc);
1604         sym->usl.spillLoc = sloc;
1605         sym->stackSpil = 1;
1606
1607         /* add it to the set of itempStack set
1608         of the spill location */
1609         addSetHead (&sloc->usl.itmpStack, sym);
1610         return sym;
1611 }
1612
1613 /*-----------------------------------------------------------------*/
1614 /* isSpiltOnStack - returns true if the spil location is on stack  */
1615 /*-----------------------------------------------------------------*/
1616 static bool
1617 isSpiltOnStack (symbol * sym)
1618 {
1619         sym_link *etype;
1620
1621         debugLog ("%s\n", __FUNCTION__);
1622         FENTRY2("called.");
1623
1624         if (!sym)
1625                 return FALSE;
1626
1627         if (!sym->isspilt)
1628                 return FALSE;
1629
1630         /*     if (sym->_G.stackSpil) */
1631         /*      return TRUE; */
1632
1633         if (!sym->usl.spillLoc)
1634                 return FALSE;
1635
1636         etype = getSpec (sym->usl.spillLoc->type);
1637         if (IN_STACK (etype))
1638                 return TRUE;
1639
1640         return FALSE;
1641 }
1642
1643 /*-----------------------------------------------------------------*/
1644 /* spillThis - spils a specific operand                            */
1645 /*-----------------------------------------------------------------*/
1646 static void
1647 spillThis (symbol * sym)
1648 {
1649         int i;
1650         debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1651         FENTRY2("sym: %s, spillLoc:%p (%s)\n", sym->rname, sym->usl.spillLoc, sym->usl.spillLoc ? sym->usl.spillLoc->rname : "<unknown>");
1652
1653         /* if this is rematerializable or has a spillLocation
1654         we are okay, else we need to create a spillLocation
1655         for it */
1656         if (!(sym->remat || sym->usl.spillLoc))
1657                 createStackSpil (sym);
1658
1659
1660         /* mark it has spilt & put it in the spilt set */
1661         sym->isspilt = 1;
1662         _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1663
1664         bitVectUnSetBit (_G.regAssigned, sym->key);
1665
1666         for (i = 0; i < sym->nRegs; i++)
1667         {
1668                 if (sym->regs[i])
1669                 {
1670                         freeReg (sym->regs[i]);
1671                         sym->regs[i] = NULL;
1672                 }
1673         }
1674
1675         /* if spilt on stack then free up r0 & r1
1676         if they could have been assigned to some
1677         LIVE ranges */
1678         if (!pic14_ptrRegReq && isSpiltOnStack (sym))
1679         {
1680                 pic14_ptrRegReq++;
1681                 spillLRWithPtrReg (sym);
1682         }
1683
1684         if (sym->usl.spillLoc && !sym->remat)
1685                 sym->usl.spillLoc->allocreq = 1;
1686
1687         return;
1688 }
1689
1690 /*-----------------------------------------------------------------*/
1691 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1692 /*-----------------------------------------------------------------*/
1693 static symbol *
1694 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1695 {
1696         bitVect *lrcs = NULL;
1697         set *selectS;
1698         symbol *sym;
1699
1700         debugLog ("%s\n", __FUNCTION__);
1701         FENTRY2("called.");
1702         /* get the spillable live ranges */
1703         lrcs = computeSpillable (ic);
1704
1705
1706         /* get all live ranges that are rematerizable */
1707         if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1708         {
1709                 /* return the least used of these */
1710                 return leastUsedLR (selectS);
1711         }
1712
1713         /* get live ranges with spillLocations in direct space */
1714         if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1715         {
1716                 sym = leastUsedLR (selectS);
1717                 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1718                         sym->usl.spillLoc->rname :
1719                 sym->usl.spillLoc->name));
1720                 sym->spildir = 1;
1721                 /* mark it as allocation required */
1722                 sym->usl.spillLoc->allocreq = 1;
1723                 return sym;
1724         }
1725
1726         /* if the symbol is local to the block then */
1727         if (forSym->liveTo < ebp->lSeq)
1728         {
1729
1730         /* check if there are any live ranges allocated
1731                 to registers that are not used in this block */
1732                 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1733                 {
1734                         sym = leastUsedLR (selectS);
1735                         /* if this is not rematerializable */
1736                         if (!sym->remat)
1737                         {
1738                                 _G.blockSpil++;
1739                                 sym->blockSpil = 1;
1740                         }
1741                         return sym;
1742                 }
1743
1744                 /* check if there are any live ranges that not
1745                 used in the remainder of the block */
1746                 if (!_G.blockSpil &&
1747                     !isiCodeInFunctionCall (ic) &&
1748                     (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1749                 {
1750                         sym = leastUsedLR (selectS);
1751                         if (!sym->remat)
1752                         {
1753                                 sym->remainSpil = 1;
1754                                 _G.blockSpil++;
1755                         }
1756                         return sym;
1757                 }
1758         }
1759
1760         /* find live ranges with spillocation && not used as pointers */
1761         if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1762         {
1763
1764                 sym = leastUsedLR (selectS);
1765                 /* mark this as allocation required */
1766                 sym->usl.spillLoc->allocreq = 1;
1767                 return sym;
1768         }
1769
1770         /* find live ranges with spillocation */
1771         if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1772         {
1773
1774                 sym = leastUsedLR (selectS);
1775                 sym->usl.spillLoc->allocreq = 1;
1776                 return sym;
1777         }
1778
1779         /* couldn't find then we need to create a spil
1780         location on the stack , for which one? the least
1781         used ofcourse */
1782         if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1783         {
1784
1785                 /* return a created spil location */
1786                 sym = createStackSpil (leastUsedLR (selectS));
1787                 sym->usl.spillLoc->allocreq = 1;
1788                 return sym;
1789         }
1790
1791         /* this is an extreme situation we will spill
1792         this one : happens very rarely but it does happen */
1793         spillThis (forSym);
1794         return forSym;
1795
1796 }
1797
1798 /*-----------------------------------------------------------------*/
1799 /* spilSomething - spil some variable & mark registers as free     */
1800 /*-----------------------------------------------------------------*/
1801 static bool
1802 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1803 {
1804         symbol *ssym;
1805         int i;
1806
1807         debugLog ("%s\n", __FUNCTION__);
1808         /* get something we can spil */
1809         ssym = selectSpil (ic, ebp, forSym);
1810
1811         /* mark it as spilt */
1812         ssym->isspilt = 1;
1813         _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1814
1815         /* mark it as not register assigned &
1816         take it away from the set */
1817         bitVectUnSetBit (_G.regAssigned, ssym->key);
1818
1819         /* mark the registers as free */
1820         for (i = 0; i < ssym->nRegs; i++)
1821                 if (ssym->regs[i])
1822                         freeReg (ssym->regs[i]);
1823
1824                 /* if spilt on stack then free up r0 & r1
1825                 if they could have been assigned to as gprs */
1826                 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1827                 {
1828                         pic14_ptrRegReq++;
1829                         spillLRWithPtrReg (ssym);
1830                 }
1831
1832                 /* if this was a block level spil then insert push & pop
1833                 at the start & end of block respectively */
1834                 if (ssym->blockSpil)
1835                 {
1836                         iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1837                         /* add push to the start of the block */
1838                         addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1839                                 ebp->sch->next : ebp->sch));
1840                         nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1841                         /* add pop to the end of the block */
1842                         addiCodeToeBBlock (ebp, nic, NULL);
1843                 }
1844
1845                 /* if spilt because not used in the remainder of the
1846                 block then add a push before this instruction and
1847                 a pop at the end of the block */
1848                 if (ssym->remainSpil)
1849                 {
1850
1851                         iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1852                         /* add push just before this instruction */
1853                         addiCodeToeBBlock (ebp, nic, ic);
1854
1855                         nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1856                         /* add pop to the end of the block */
1857                         addiCodeToeBBlock (ebp, nic, NULL);
1858                 }
1859
1860                 if (ssym == forSym)
1861                         return FALSE;
1862                 else
1863                         return TRUE;
1864 }
1865
1866 /*-----------------------------------------------------------------*/
1867 /* getRegPtr - will try for PTR if not a GPR type if not spil      */
1868 /*-----------------------------------------------------------------*/
1869 static regs *
1870 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1871 {
1872         regs *reg;
1873         int j;
1874
1875         debugLog ("%s\n", __FUNCTION__);
1876 tryAgain:
1877         /* try for a ptr type */
1878         if ((reg = allocReg (REG_PTR)))
1879                 return reg;
1880
1881         /* try for gpr type */
1882         if ((reg = allocReg (REG_GPR)))
1883                 return reg;
1884
1885         /* we have to spil */
1886         if (!spilSomething (ic, ebp, sym))
1887                 return NULL;
1888
1889         /* make sure partially assigned registers aren't reused */
1890         for (j=0; j<=sym->nRegs; j++)
1891                 if (sym->regs[j])
1892                         sym->regs[j]->isFree = 0;
1893
1894                         /* this looks like an infinite loop but
1895                 in really selectSpil will abort  */
1896                 goto tryAgain;
1897 }
1898
1899 /*-----------------------------------------------------------------*/
1900 /* getRegGpr - will try for GPR if not spil                        */
1901 /*-----------------------------------------------------------------*/
1902 static regs *
1903 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1904 {
1905         regs *reg;
1906         int j;
1907
1908         debugLog ("%s\n", __FUNCTION__);
1909 tryAgain:
1910         /* try for gpr type */
1911         if ((reg = allocReg (REG_GPR)))
1912                 return reg;
1913
1914         if (!pic14_ptrRegReq)
1915                 if ((reg = allocReg (REG_PTR)))
1916                         return reg;
1917
1918                 /* we have to spil */
1919                 if (!spilSomething (ic, ebp, sym))
1920                         return NULL;
1921
1922                 /* make sure partially assigned registers aren't reused */
1923                 for (j=0; j<=sym->nRegs; j++)
1924                         if (sym->regs[j])
1925                                 sym->regs[j]->isFree = 0;
1926
1927                         /* this looks like an infinite loop but
1928                         in really selectSpil will abort  */
1929                         goto tryAgain;
1930 }
1931
1932 /*-----------------------------------------------------------------*/
1933 /* symHasReg - symbol has a given register                         */
1934 /*-----------------------------------------------------------------*/
1935 static bool
1936 symHasReg (symbol * sym, regs * reg)
1937 {
1938         int i;
1939
1940         debugLog ("%s\n", __FUNCTION__);
1941         for (i = 0; i < sym->nRegs; i++)
1942                 if (sym->regs[i] == reg)
1943                         return TRUE;
1944
1945                 return FALSE;
1946 }
1947
1948 /*-----------------------------------------------------------------*/
1949 /* deassignLRs - check the live to and if they have registers & are */
1950 /*               not spilt then free up the registers              */
1951 /*-----------------------------------------------------------------*/
1952 static void
1953 deassignLRs (iCode * ic, eBBlock * ebp)
1954 {
1955         symbol *sym;
1956         int k;
1957         symbol *result;
1958
1959         debugLog ("%s\n", __FUNCTION__);
1960         for (sym = hTabFirstItem (liveRanges, &k); sym;
1961         sym = hTabNextItem (liveRanges, &k))
1962         {
1963
1964                 symbol *psym = NULL;
1965                 /* if it does not end here */
1966                 if (sym->liveTo > ic->seq)
1967                         continue;
1968
1969                 /* Prevent the result from being assigned the same registers as (one)
1970                  * operand as many genXXX-functions fail otherwise.
1971                  * POINTER_GET(ic) || ic->op == LEFT_OP || ic->op == RIGHT_OP || ic->op == NOT
1972                  * are known to fail. */
1973                 if (sym->liveTo == ic->seq && IC_RESULT(ic))
1974                 {
1975                         switch (ic->op)
1976                         {
1977                         case '=':       /* assignment */
1978                         case BITWISEAND: /* bitwise AND */
1979                         case '|':       /* bitwise OR */
1980                         case '^':       /* bitwise XOR */
1981                         case '~':       /* bitwise negate */
1982                         case RLC:       /* rotate through carry */
1983                         case RRC:
1984                         case UNARYMINUS:
1985                         case '+':       /* addition */
1986                         case '-':       /* subtraction */
1987                           /* go ahead, these are safe to use with
1988                            * non-disjoint register sets */
1989                           break;
1990
1991                         default:
1992                                 /* do not release operand registers */
1993                                 //fprintf (stderr, "%s:%u: operand not freed: ", __FILE__, __LINE__); piCode (ic, stderr); fprintf (stderr, "\n");
1994                                 continue;
1995                         } // switch
1996                 }
1997
1998                 /* if it was spilt on stack then we can
1999                 mark the stack spil location as free */
2000                 if (sym->isspilt)
2001                 {
2002                         if (sym->stackSpil)
2003                         {
2004                                 sym->usl.spillLoc->isFree = 1;
2005                                 sym->stackSpil = 0;
2006                         }
2007                         continue;
2008                 }
2009
2010                 if (!bitVectBitValue (_G.regAssigned, sym->key))
2011                         continue;
2012                 /* special case check if this is an IFX &
2013                 the privious one was a pop and the
2014                 previous one was not spilt then keep track
2015                 of the symbol */
2016                 if (ic->op == IFX && ic->prev &&
2017                         ic->prev->op == IPOP &&
2018                         !ic->prev->parmPush &&
2019                         IS_SYMOP(IC_LEFT (ic->prev)) &&
2020                         !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
2021                         psym = OP_SYMBOL (IC_LEFT (ic->prev));
2022
2023                 if (sym->nRegs)
2024                 {
2025                         int i = 0;
2026
2027                         bitVectUnSetBit (_G.regAssigned, sym->key);
2028
2029                         /* if the result of this one needs registers
2030                         and does not have it then assign it right
2031                         away */
2032                         if (IC_RESULT (ic) &&
2033                                 !(SKIP_IC2 (ic) ||      /* not a special icode */
2034                                 ic->op == JUMPTABLE ||
2035                                 ic->op == IFX ||
2036                                 ic->op == IPUSH ||
2037                                 ic->op == IPOP ||
2038                                 ic->op == RETURN ||
2039                                 POINTER_SET (ic)) &&
2040                                 IS_SYMOP (IC_RESULT (ic)) &&
2041                                 (result = OP_SYMBOL (IC_RESULT (ic))) &&        /* has a result */
2042                                 result->liveTo > ic->seq &&     /* and will live beyond this */
2043                                 result->liveTo <= ebp->lSeq &&  /* does not go beyond this block */
2044                                 result->liveFrom == ic->seq &&    /* does not start before here */
2045                                 result->regType == sym->regType &&      /* same register types */
2046                                 result->regType == sym->regType &&      /* same register types */
2047                                 result->nRegs &&        /* which needs registers */
2048                                 !result->isspilt &&     /* and does not already have them */
2049                                 !result->remat &&
2050                                 !bitVectBitValue (_G.regAssigned, result->key) &&
2051                                 /* the number of free regs + number of regs in this LR
2052                                 can accomodate the what result Needs */
2053                                 ((nfreeRegsType (result->regType) +
2054                                 sym->nRegs) >= result->nRegs)
2055                                 )
2056                         {
2057
2058                                 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2059                                         if (i < sym->nRegs)
2060                                                 result->regs[i] = sym->regs[i];
2061                                         else
2062                                                 result->regs[i] = getRegGpr (ic, ebp, result);
2063
2064                                         _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2065
2066                         }
2067
2068                         /* free the remaining */
2069                         for (; i < sym->nRegs; i++)
2070                         {
2071                                 if (psym)
2072                                 {
2073                                         if (!symHasReg (psym, sym->regs[i]))
2074                                                 freeReg (sym->regs[i]);
2075                                 }
2076                                 else
2077                                         freeReg (sym->regs[i]);
2078                         }
2079                 }
2080         }
2081 }
2082
2083
2084 /*-----------------------------------------------------------------*/
2085 /* reassignLR - reassign this to registers                         */
2086 /*-----------------------------------------------------------------*/
2087 static void
2088 reassignLR (operand * op)
2089 {
2090         symbol *sym = OP_SYMBOL (op);
2091         int i;
2092
2093         debugLog ("%s\n", __FUNCTION__);
2094         /* not spilt any more */
2095         sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2096         bitVectUnSetBit (_G.spiltSet, sym->key);
2097
2098         _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2099
2100         _G.blockSpil--;
2101
2102         for (i = 0; i < sym->nRegs; i++)
2103                 sym->regs[i]->isFree = 0;
2104 }
2105
2106 /*-----------------------------------------------------------------*/
2107 /* willCauseSpill - determines if allocating will cause a spill    */
2108 /*-----------------------------------------------------------------*/
2109 static int
2110 willCauseSpill (int nr, int rt)
2111 {
2112         debugLog ("%s\n", __FUNCTION__);
2113         /* first check if there are any avlb registers
2114         of te type required */
2115         if (rt == REG_PTR)
2116         {
2117         /* special case for pointer type
2118         if pointer type not avlb then
2119                 check for type gpr */
2120                 if (nFreeRegs (rt) >= nr)
2121                         return 0;
2122                 if (nFreeRegs (REG_GPR) >= nr)
2123                         return 0;
2124         }
2125         else
2126         {
2127                 if (pic14_ptrRegReq)
2128                 {
2129                         if (nFreeRegs (rt) >= nr)
2130                                 return 0;
2131                 }
2132                 else
2133                 {
2134                         if (nFreeRegs (REG_PTR) +
2135                                 nFreeRegs (REG_GPR) >= nr)
2136                                 return 0;
2137                 }
2138         }
2139
2140         debugLog (" ... yep it will (cause a spill)\n");
2141         /* it will cause a spil */
2142         return 1;
2143 }
2144
2145 /*-----------------------------------------------------------------*/
2146 /* positionRegs - the allocator can allocate same registers to res- */
2147 /* ult and operand, if this happens make sure they are in the same */
2148 /* position as the operand otherwise chaos results                 */
2149 /*-----------------------------------------------------------------*/
2150 static void
2151 positionRegs (symbol * result, symbol * opsym, int lineno)
2152 {
2153         int count = min (result->nRegs, opsym->nRegs);
2154         int i, j = 0, shared = 0;
2155
2156         debugLog ("%s\n", __FUNCTION__);
2157         /* if the result has been spilt then cannot share */
2158         if (opsym->isspilt)
2159                 return;
2160 again:
2161         shared = 0;
2162         /* first make sure that they actually share */
2163         for (i = 0; i < count; i++)
2164         {
2165                 for (j = 0; j < count; j++)
2166                 {
2167                         if (result->regs[i] == opsym->regs[j] && i != j)
2168                         {
2169                                 shared = 1;
2170                                 goto xchgPositions;
2171                         }
2172                 }
2173         }
2174 xchgPositions:
2175         if (shared)
2176         {
2177                 regs *tmp = result->regs[i];
2178                 result->regs[i] = result->regs[j];
2179                 result->regs[j] = tmp;
2180                 goto again;
2181         }
2182 }
2183
2184 /*------------------------------------------------------------------*/
2185 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2186 /* it should either have registers or have beed spilled. Otherwise, */
2187 /* there was an uninitialized variable, so just spill this to get   */
2188 /* the operand in a valid state.                                    */
2189 /*------------------------------------------------------------------*/
2190 static void
2191 verifyRegsAssigned (operand *op, iCode * ic)
2192 {
2193   symbol * sym;
2194
2195   if (!op) return;
2196   if (!IS_ITEMP (op)) return;
2197
2198   sym = OP_SYMBOL (op);
2199   if (sym->isspilt) return;
2200   if (!sym->nRegs) return;
2201   if (sym->regs[0]) return;
2202
2203   werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2204             sym->prereqv ? sym->prereqv->name : sym->name);
2205   spillThis (sym);
2206 }
2207
2208
2209 /*-----------------------------------------------------------------*/
2210 /* serialRegAssign - serially allocate registers to the variables  */
2211 /*-----------------------------------------------------------------*/
2212 static void
2213 serialRegAssign (eBBlock ** ebbs, int count)
2214 {
2215         int i;
2216
2217         debugLog ("%s\n", __FUNCTION__);
2218         /* for all blocks */
2219         for (i = 0; i < count; i++)
2220         {
2221
2222                 iCode *ic;
2223
2224                 if (ebbs[i]->noPath &&
2225                         (ebbs[i]->entryLabel != entryLabel &&
2226                         ebbs[i]->entryLabel != returnLabel))
2227                         continue;
2228
2229                 /* of all instructions do */
2230                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2231                 {
2232                         debugLog ("  op: %s\n", decodeOp (ic->op));
2233
2234                         /* if this is an ipop that means some live
2235                         range will have to be assigned again */
2236                         if (ic->op == IPOP)
2237                                 reassignLR (IC_LEFT (ic));
2238
2239                         /* if result is present && is a true symbol */
2240                         if (IC_RESULT (ic) && ic->op != IFX &&
2241                                 IS_TRUE_SYMOP (IC_RESULT (ic)))
2242                                 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2243
2244                         /* take away registers from live
2245                         ranges that end at this instruction */
2246                         deassignLRs (ic, ebbs[i]);
2247
2248                         /* some don't need registers */
2249                         if (SKIP_IC2 (ic) ||
2250                                 ic->op == JUMPTABLE ||
2251                                 ic->op == IFX ||
2252                                 ic->op == IPUSH ||
2253                                 ic->op == IPOP ||
2254                                 (IC_RESULT (ic) && POINTER_SET (ic)))
2255                                 continue;
2256
2257                         /* now we need to allocate registers
2258                         only for the result */
2259                         if (IC_RESULT (ic) && IS_SYMOP (IC_RESULT (ic)))
2260                         {
2261                                 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2262                                 bitVect *spillable;
2263                                 int willCS;
2264                                 int j;
2265                                 int ptrRegSet = 0;
2266
2267                                 /* Make sure any spill location is definately allocated */
2268                                 if (sym->isspilt && !sym->remat && sym->usl.spillLoc &&
2269                                     !sym->usl.spillLoc->allocreq)
2270                                 {
2271                                         sym->usl.spillLoc->allocreq++;
2272                                 }
2273
2274                                 /* if it does not need or is spilt
2275                                 or is already assigned to registers
2276                                 or will not live beyond this instructions */
2277                                 if (!sym->nRegs ||
2278                                         sym->isspilt ||
2279                                         bitVectBitValue (_G.regAssigned, sym->key) ||
2280                                         sym->liveTo <= ic->seq)
2281                                         continue;
2282
2283                                 /* if some liverange has been spilt at the block level
2284                                 and this one live beyond this block then spil this
2285                                 to be safe */
2286                                 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2287                                 {
2288                                         spillThis (sym);
2289                                         continue;
2290                                 }
2291                                 /* if trying to allocate this will cause
2292                                 a spill and there is nothing to spill
2293                                 or this one is rematerializable then
2294                                 spill this one */
2295                                 willCS = willCauseSpill (sym->nRegs, sym->regType);
2296                                 spillable = computeSpillable (ic);
2297                                 if (sym->remat ||
2298                                         (willCS && bitVectIsZero (spillable)))
2299                                 {
2300
2301                                         spillThis (sym);
2302                                         continue;
2303
2304                                 }
2305
2306                                 /* If the live range preceeds the point of definition
2307                                    then ideally we must take into account registers that
2308                                    have been allocated after sym->liveFrom but freed
2309                                    before ic->seq. This is complicated, so spill this
2310                                    symbol instead and let fillGaps handle the allocation. */
2311                                 if (sym->liveFrom < ic->seq)
2312                                 {
2313                                         spillThis (sym);
2314                                         continue;
2315                                 }
2316
2317                                 /* if it has a spillocation & is used less than
2318                                 all other live ranges then spill this */
2319                                 if (willCS) {
2320                                         if (sym->usl.spillLoc) {
2321                                                 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2322                                                         allLRs, ebbs[i], ic));
2323                                                 if (leastUsed && leastUsed->used > sym->used) {
2324                                                         spillThis (sym);
2325                                                         continue;
2326                                                 }
2327                                         } else {
2328                                                 /* if none of the liveRanges have a spillLocation then better
2329                                                 to spill this one than anything else already assigned to registers */
2330                                                 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2331                                                         /* if this is local to this block then we might find a block spil */
2332                                                         if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2333                                                                 spillThis (sym);
2334                                                                 continue;
2335                                                         }
2336                                                 }
2337                                         }
2338                                 }
2339
2340                                 if (ic->op == RECEIVE)
2341                                         debugLog ("When I get clever, I'll optimize the receive logic\n");
2342
2343                                 /* if we need ptr regs for the right side
2344                                 then mark it */
2345                                 if (POINTER_GET (ic)
2346                                         && IS_SYMOP(IC_LEFT(ic))
2347                                         && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2348                                                 <= (unsigned) PTRSIZE)
2349                                 {
2350                                         pic14_ptrRegReq++;
2351                                         ptrRegSet = 1;
2352                                 }
2353                                 /* else we assign registers to it */
2354                                 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2355
2356                                 debugLog ("  %d - \n", __LINE__);
2357                                 if(debugF)
2358                                         bitVectDebugOn(_G.regAssigned, debugF);
2359                                 for (j = 0; j < sym->nRegs; j++)
2360                                 {
2361                                         if (sym->regType == REG_PTR)
2362                                                 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2363                                         else
2364                                                 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2365
2366                                         /* if the allocation failed which means
2367                                         this was spilt then break */
2368                                         if (!sym->regs[j])
2369                                                 break;
2370                                 }
2371                                 debugLog ("  %d - \n", __LINE__);
2372
2373                                 /* if it shares registers with operands make sure
2374                                 that they are in the same position */
2375                                 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2376                                         IS_SYMOP(IC_RESULT(ic)) &&
2377                                         OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2378                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2379                                         OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2380                                 /* do the same for the right operand */
2381                                 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2382                                         IS_SYMOP(IC_RESULT(ic)) &&
2383                                         OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2384                                         positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2385                                         OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2386
2387                                 debugLog ("  %d - \n", __LINE__);
2388                                 if (ptrRegSet)
2389                                 {
2390                                         debugLog ("  %d - \n", __LINE__);
2391                                         pic14_ptrRegReq--;
2392                                         ptrRegSet = 0;
2393                                 }
2394
2395                         }
2396                 }
2397         }
2398
2399     /* Check for and fix any problems with uninitialized operands */
2400     for (i = 0; i < count; i++)
2401         {
2402                 iCode *ic;
2403
2404                 if (ebbs[i]->noPath &&
2405                         (ebbs[i]->entryLabel != entryLabel &&
2406                          ebbs[i]->entryLabel != returnLabel))
2407                         continue;
2408
2409                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2410                 {
2411                         if (SKIP_IC2 (ic))
2412                           continue;
2413
2414                         if (ic->op == IFX)
2415                         {
2416                                 verifyRegsAssigned (IC_COND (ic), ic);
2417                                 continue;
2418                         }
2419
2420                         if (ic->op == JUMPTABLE)
2421                         {
2422                                 verifyRegsAssigned (IC_JTCOND (ic), ic);
2423                                 continue;
2424                         }
2425
2426                         verifyRegsAssigned (IC_RESULT (ic), ic);
2427                         verifyRegsAssigned (IC_LEFT (ic), ic);
2428                         verifyRegsAssigned (IC_RIGHT (ic), ic);
2429                 }
2430         }
2431
2432 }
2433
2434 /*-----------------------------------------------------------------*/
2435 /* rUmaskForOp :- returns register mask for an operand             */
2436 /*-----------------------------------------------------------------*/
2437 static bitVect *
2438 rUmaskForOp (operand * op)
2439 {
2440         bitVect *rumask;
2441         symbol *sym;
2442         int j;
2443
2444         debugLog ("%s\n", __FUNCTION__);
2445         /* only temporaries are assigned registers */
2446         if (!IS_ITEMP (op))
2447                 return NULL;
2448
2449         sym = OP_SYMBOL (op);
2450
2451         /* if spilt or no registers assigned to it
2452         then nothing */
2453         if (sym->isspilt || !sym->nRegs)
2454                 return NULL;
2455
2456         rumask = newBitVect (pic14_nRegs);
2457
2458         for (j = 0; j < sym->nRegs; j++)
2459         {
2460                 rumask = bitVectSetBit (rumask,
2461                         sym->regs[j]->rIdx);
2462         }
2463
2464         return rumask;
2465 }
2466
2467 /*-----------------------------------------------------------------*/
2468 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2469 /*-----------------------------------------------------------------*/
2470 static bitVect *
2471 regsUsedIniCode (iCode * ic)
2472 {
2473         bitVect *rmask = newBitVect (pic14_nRegs);
2474
2475         debugLog ("%s\n", __FUNCTION__);
2476         /* do the special cases first */
2477         if (ic->op == IFX)
2478         {
2479                 rmask = bitVectUnion (rmask,
2480                         rUmaskForOp (IC_COND (ic)));
2481                 goto ret;
2482         }
2483
2484         /* for the jumptable */
2485         if (ic->op == JUMPTABLE)
2486         {
2487                 rmask = bitVectUnion (rmask,
2488                         rUmaskForOp (IC_JTCOND (ic)));
2489
2490                 goto ret;
2491         }
2492
2493         /* of all other cases */
2494         if (IC_LEFT (ic))
2495                 rmask = bitVectUnion (rmask,
2496                 rUmaskForOp (IC_LEFT (ic)));
2497
2498
2499         if (IC_RIGHT (ic))
2500                 rmask = bitVectUnion (rmask,
2501                 rUmaskForOp (IC_RIGHT (ic)));
2502
2503         if (IC_RESULT (ic))
2504                 rmask = bitVectUnion (rmask,
2505                 rUmaskForOp (IC_RESULT (ic)));
2506
2507 ret:
2508         return rmask;
2509 }
2510
2511 /*-----------------------------------------------------------------*/
2512 /* createRegMask - for each instruction will determine the regsUsed */
2513 /*-----------------------------------------------------------------*/
2514 static void
2515 createRegMask (eBBlock ** ebbs, int count)
2516 {
2517         int i;
2518
2519         debugLog ("%s\n", __FUNCTION__);
2520         /* for all blocks */
2521         for (i = 0; i < count; i++)
2522         {
2523                 iCode *ic;
2524
2525                 if (ebbs[i]->noPath &&
2526                         (ebbs[i]->entryLabel != entryLabel &&
2527                         ebbs[i]->entryLabel != returnLabel))
2528                         continue;
2529
2530                 /* for all instructions */
2531                 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2532                 {
2533
2534                         int j;
2535
2536                         if (SKIP_IC2 (ic) || !ic->rlive)
2537                                 continue;
2538
2539                                 /* first mark the registers used in this
2540                         instruction */
2541                         ic->rUsed = regsUsedIniCode (ic);
2542                         _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2543
2544                         /* now create the register mask for those
2545                         registers that are in use : this is a
2546                         super set of ic->rUsed */
2547                         ic->rMask = newBitVect (pic14_nRegs + 1);
2548
2549                         /* for all live Ranges alive at this point */
2550                         for (j = 1; j < ic->rlive->size; j++)
2551                         {
2552                                 symbol *sym;
2553                                 int k;
2554
2555                                 /* if not alive then continue */
2556                                 if (!bitVectBitValue (ic->rlive, j))
2557                                         continue;
2558
2559                                 /* find the live range we are interested in */
2560                                 if (!(sym = hTabItemWithKey (liveRanges, j)))
2561                                 {
2562                                         werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2563                                                 "createRegMask cannot find live range");
2564                                         exit (0);
2565                                 }
2566
2567                                 /* if no register assigned to it */
2568                                 if (!sym->nRegs || sym->isspilt)
2569                                         continue;
2570
2571                                 /* for all the registers allocated to it */
2572                                 for (k = 0; k < sym->nRegs; k++)
2573                                         if (sym->regs[k])
2574                                                 ic->rMask =
2575                                                 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2576                         }
2577                 }
2578         }
2579 }
2580 #if 0
2581 /* This was the active version */
2582 /*-----------------------------------------------------------------*/
2583 /* rematStr - returns the rematerialized string for a remat var    */
2584 /*-----------------------------------------------------------------*/
2585 static symbol *
2586 rematStr (symbol * sym)
2587 {
2588         char *s = buffer;
2589         iCode *ic = sym->rematiCode;
2590         symbol *psym = NULL;
2591
2592         debugLog ("%s\n", __FUNCTION__);
2593
2594         //printf ("%s\n", s);
2595
2596         /* if plus or minus print the right hand side */
2597
2598         if (ic->op == '+' || ic->op == '-') {
2599
2600                 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2601
2602                 sprintf (s, "(%s %c 0x%04x)",
2603                         OP_SYMBOL (IC_LEFT (ric))->rname,
2604                         ic->op,
2605                         (int) operandLitValue (IC_RIGHT (ic)));
2606
2607
2608                 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2609
2610                 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2611                 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2612
2613                 return psym;
2614         }
2615
2616         sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2617         psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2618
2619         //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2620         return psym;
2621 }
2622 #endif
2623
2624 #if 0
2625 /* deprecated version */
2626 /*-----------------------------------------------------------------*/
2627 /* rematStr - returns the rematerialized string for a remat var    */
2628 /*-----------------------------------------------------------------*/
2629 static char *
2630 rematStr (symbol * sym)
2631 {
2632         char *s = buffer;
2633         iCode *ic = sym->rematiCode;
2634
2635         debugLog ("%s\n", __FUNCTION__);
2636         while (1)
2637         {
2638
2639                 printf ("%s\n", s);
2640                 /* if plus or minus print the right hand side */
2641                 /*
2642                 if (ic->op == '+' || ic->op == '-') {
2643                 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2644                 ic->op );
2645                 s += strlen(s);
2646                 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2647                 continue ;
2648                 }
2649                 */
2650                 if (ic->op == '+' || ic->op == '-')
2651                 {
2652                         iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2653                         sprintf (s, "(%s %c 0x%04x)",
2654                                 OP_SYMBOL (IC_LEFT (ric))->rname,
2655                                 ic->op,
2656                                 (int) operandLitValue (IC_RIGHT (ic)));
2657
2658                         //s += strlen(s);
2659                         //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2660                         //continue ;
2661                         //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2662                         return buffer;
2663                 }
2664
2665                 /* we reached the end */
2666                 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2667                 break;
2668         }
2669
2670         printf ("%s\n", buffer);
2671         return buffer;
2672 }
2673 #endif
2674
2675 /*-----------------------------------------------------------------*/
2676 /* regTypeNum - computes the type & number of registers required   */
2677 /*-----------------------------------------------------------------*/
2678 static void
2679 regTypeNum ()
2680 {
2681         symbol *sym;
2682         int k;
2683         //iCode *ic;
2684
2685         debugLog ("%s\n", __FUNCTION__);
2686         /* for each live range do */
2687         for (sym = hTabFirstItem (liveRanges, &k); sym;
2688         sym = hTabNextItem (liveRanges, &k)) {
2689
2690                 debugLog ("  %d - %s\n", __LINE__, sym->rname);
2691
2692                 /* if used zero times then no registers needed */
2693                 if ((sym->liveTo - sym->liveFrom) == 0)
2694                         continue;
2695
2696
2697                 /* if the live range is a temporary */
2698                 if (sym->isitmp) {
2699
2700                         debugLog ("  %d - itemp register\n", __LINE__);
2701
2702                         /* if the type is marked as a conditional */
2703                         if (sym->regType == REG_CND)
2704                                 continue;
2705
2706                         /* if used in return only then we don't
2707                         need registers */
2708                         if (sym->accuse) {
2709                                 if (IS_AGGREGATE (sym->type) || sym->isptr)
2710                                         sym->type = aggrToPtr (sym->type, FALSE);
2711                                 debugLog ("  %d - no reg needed - accumulator used\n", __LINE__);
2712
2713                                 continue;
2714                         }
2715
2716                         if (sym->ruonly) {
2717                                 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2718                                 //  sym->type = aggrToPtr (sym->type, FALSE);
2719                                 debugLog ("  %d - used as a return\n", __LINE__);
2720
2721                                 //continue;
2722                         }
2723
2724                         /* if the symbol has only one definition &
2725                         that definition is a get_pointer and the
2726                         pointer we are getting is rematerializable and
2727                         in "data" space */
2728
2729 #if 0
2730                         if (bitVectnBitsOn (sym->defs) == 1 &&
2731                             (ic = hTabItemWithKey (iCodehTab,
2732                                                    bitVectFirstBit (sym->defs))) &&
2733                             POINTER_GET (ic) &&
2734                             !IS_BITVAR (sym->etype) &&
2735                             (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2736
2737                                 if (ptrPseudoSymSafe (sym, ic)) {
2738
2739                                         symbol *psym;
2740
2741                                         debugLog ("  %d - \n", __LINE__);
2742
2743                                         /* create a psuedo symbol & force a spil */
2744                                         //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2745                                         psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2746                                         psym->type = sym->type;
2747                                         psym->etype = sym->etype;
2748                                         psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2749                                         strcpy (psym->rname, psym->name);
2750                                         sym->isspilt = 1;
2751                                         sym->usl.spillLoc = psym;
2752                                         continue;
2753                                 }
2754
2755                                 /* if in data space or idata space then try to
2756                                 allocate pointer register */
2757
2758                         }
2759 #endif
2760
2761                         /* if not then we require registers */
2762                         sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2763                                 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2764                         getSize (sym->type));
2765
2766
2767                         if(IS_PTR_CONST (sym->type)) {
2768                                 debugLog ("  %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2769                                 sym->nRegs = 2;
2770                         }
2771
2772                         if (sym->nRegs > 4) {
2773                                 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2774                                 printTypeChain (sym->type, stderr);
2775                                 fprintf (stderr, "\n");
2776                         }
2777
2778                         /* determine the type of register required */
2779                         if (sym->nRegs == 1 &&
2780                                 IS_PTR (sym->type) &&
2781                                 sym->uptr)
2782                                 sym->regType = REG_PTR;
2783                         else
2784                                 sym->regType = REG_GPR;
2785
2786
2787                         debugLog ("  reg name %s,  reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2788
2789                 }
2790                 else
2791                         /* for the first run we don't provide */
2792                         /* registers for true symbols we will */
2793                         /* see how things go                  */
2794                         sym->nRegs = 0;
2795         }
2796
2797 }
2798 DEFSETFUNC (markRegFree)
2799 {
2800         ((regs *)item)->isFree = 1;
2801
2802         return 0;
2803 }
2804
2805 DEFSETFUNC (deallocReg)
2806 {
2807         fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2808         ((regs *)item)->isFree = 1;
2809         ((regs *)item)->wasUsed = 0;
2810
2811         return 0;
2812 }
2813 /*-----------------------------------------------------------------*/
2814 /* freeAllRegs - mark all registers as free                        */
2815 /*-----------------------------------------------------------------*/
2816 void
2817 pic14_freeAllRegs ()
2818 {
2819         //  int i;
2820
2821         debugLog ("%s\n", __FUNCTION__);
2822
2823         applyToSet(dynAllocRegs,markRegFree);
2824         applyToSet(dynStackRegs,markRegFree);
2825
2826         /*
2827         for (i = 0; i < pic14_nRegs; i++)
2828         regspic14[i].isFree = 1;
2829         */
2830 }
2831
2832 /*-----------------------------------------------------------------*/
2833 /*-----------------------------------------------------------------*/
2834 void
2835 pic14_deallocateAllRegs ()
2836 {
2837         //  int i;
2838
2839         debugLog ("%s\n", __FUNCTION__);
2840
2841         applyToSet(dynAllocRegs,deallocReg);
2842
2843         /*
2844         for (i = 0; i < pic14_nRegs; i++) {
2845                 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2846                 regspic14[i].isFree = 1;
2847                 regspic14[i].wasUsed = 0;
2848                 }
2849         }
2850         */
2851 }
2852
2853
2854 /*-----------------------------------------------------------------*/
2855 /* deallocStackSpil - this will set the stack pointer back         */
2856 /*-----------------------------------------------------------------*/
2857 static
2858 DEFSETFUNC (deallocStackSpil)
2859 {
2860         symbol *sym = item;
2861
2862         debugLog ("%s\n", __FUNCTION__);
2863         deallocLocal (sym);
2864         return 0;
2865 }
2866
2867 /*-----------------------------------------------------------------*/
2868 /* farSpacePackable - returns the packable icode for far variables */
2869 /*-----------------------------------------------------------------*/
2870 static iCode *
2871 farSpacePackable (iCode * ic)
2872 {
2873         iCode *dic;
2874
2875         debugLog ("%s\n", __FUNCTION__);
2876         /* go thru till we find a definition for the
2877         symbol on the right */
2878         for (dic = ic->prev; dic; dic = dic->prev)
2879         {
2880
2881                 /* if the definition is a call then no */
2882                 if ((dic->op == CALL || dic->op == PCALL) &&
2883                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2884                 {
2885                         return NULL;
2886                 }
2887
2888                 /* if shift by unknown amount then not */
2889                 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2890                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2891                         return NULL;
2892
2893                 /* if pointer get and size > 1 */
2894                 if (POINTER_GET (dic) &&
2895                         getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2896                         return NULL;
2897
2898                 if (POINTER_SET (dic) &&
2899                         getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2900                         return NULL;
2901
2902                 /* if any three is a true symbol in far space */
2903                 if (IC_RESULT (dic) &&
2904                         IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2905                         isOperandInFarSpace (IC_RESULT (dic)))
2906                         return NULL;
2907
2908                 if (IC_RIGHT (dic) &&
2909                         IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2910                         isOperandInFarSpace (IC_RIGHT (dic)) &&
2911                         !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2912                         return NULL;
2913
2914                 if (IC_LEFT (dic) &&
2915                         IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2916                         isOperandInFarSpace (IC_LEFT (dic)) &&
2917                         !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2918                         return NULL;
2919
2920                 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2921                 {
2922                         if ((dic->op == LEFT_OP ||
2923                                 dic->op == RIGHT_OP ||
2924                                 dic->op == '-') &&
2925                                 IS_OP_LITERAL (IC_RIGHT (dic)))
2926                                 return NULL;
2927                         else
2928                                 return dic;
2929                 }
2930         }
2931
2932         return NULL;
2933 }
2934
2935 /*-----------------------------------------------------------------*/
2936 /* packRegsForAssign - register reduction for assignment           */
2937 /*-----------------------------------------------------------------*/
2938 static int
2939 packRegsForAssign (iCode * ic, eBBlock * ebp)
2940 {
2941
2942         iCode *dic, *sic;
2943
2944         debugLog ("%s\n", __FUNCTION__);
2945
2946         debugAopGet ("  result:", IC_RESULT (ic));
2947         debugAopGet ("  left:", IC_LEFT (ic));
2948         debugAopGet ("  right:", IC_RIGHT (ic));
2949
2950         /* if this is at an absolute address, then get the address. */
2951         if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2952                 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2953                         debugLog ("  %d - found config word declaration\n", __LINE__);
2954                         if(IS_VALOP(IC_RIGHT(ic))) {
2955                                 debugLog ("  setting config word to %x\n",
2956                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2957                                 assignConfigWordValue(  SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2958                                         (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2959                         }
2960
2961                         /* remove the assignment from the iCode chain. */
2962
2963                         remiCodeFromeBBlock (ebp, ic);
2964                         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2965                         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2966
2967                         return 1;
2968
2969                 }
2970         }
2971
2972         if (!IS_ITEMP (IC_RESULT (ic))) {
2973                 allocDirReg(IC_RESULT (ic));
2974                 debugLog ("  %d - result is not temp\n", __LINE__);
2975         }
2976         /*
2977         if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2978         debugLog ("  %d - left is not temp, allocating\n", __LINE__);
2979         allocDirReg(IC_LEFT (ic));
2980         }
2981         */
2982
2983         if (!IS_ITEMP (IC_RIGHT (ic))) {
2984                 debugLog ("  %d - not packing - right is not temp\n", __LINE__);
2985
2986                 /* only pack if this is not a function pointer */
2987                 if (!IS_REF (IC_RIGHT (ic)))
2988                         allocDirReg(IC_RIGHT (ic));
2989                 return 0;
2990         }
2991
2992         if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2993                 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2994         {
2995                 debugLog ("  %d - not packing - right side fails \n", __LINE__);
2996                 return 0;
2997         }
2998
2999         /* if the true symbol is defined in far space or on stack
3000         then we should not since this will increase register pressure */
3001         if (isOperandInFarSpace (IC_RESULT (ic)))
3002         {
3003                 if ((dic = farSpacePackable (ic)))
3004                         goto pack;
3005                 else
3006                         return 0;
3007
3008         }
3009         /* find the definition of iTempNN scanning backwards if we find a
3010         a use of the true symbol before we find the definition then
3011         we cannot pack */
3012         for (dic = ic->prev; dic; dic = dic->prev)
3013         {
3014
3015                 /* if there is a function call and this is
3016                 a parameter & not my parameter then don't pack it */
3017                 if ((dic->op == CALL || dic->op == PCALL) &&
3018                         (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
3019                         !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
3020                 {
3021                         debugLog ("  %d - \n", __LINE__);
3022                         dic = NULL;
3023                         break;
3024                 }
3025
3026                 if (SKIP_IC2 (dic))
3027                         continue;
3028
3029                 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3030                         IS_OP_VOLATILE (IC_RESULT (dic)))
3031                 {
3032                         debugLog ("  %d - dic is VOLATILE \n", __LINE__);
3033                         dic = NULL;
3034                         break;
3035                 }
3036
3037                 if (IS_SYMOP (IC_RESULT (dic)) &&
3038                         IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3039                 {
3040                         /* A previous result was assigned to the same register - we'll our definition */
3041                         debugLog ("  %d - dic result key == ic right key -- pointer set=%c\n",
3042                                 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3043                         if (POINTER_SET (dic))
3044                                 dic = NULL;
3045
3046                         break;
3047                 }
3048
3049                 if (IS_SYMOP (IC_RIGHT (dic)) &&
3050                         (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3051                         IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3052                 {
3053                         debugLog ("  %d - dic right key == ic rightor result key\n", __LINE__);
3054                         dic = NULL;
3055                         break;
3056                 }
3057
3058                 if (IS_SYMOP (IC_LEFT (dic)) &&
3059                         (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3060                         IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3061                 {
3062                         debugLog ("  %d - dic left key == ic rightor result key\n", __LINE__);
3063                         dic = NULL;
3064                         break;
3065                 }
3066
3067                 if (POINTER_SET (dic) &&
3068                         IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3069                 {
3070                         debugLog ("  %d - dic result key == ic result key -- pointer set=Y\n",
3071                                 __LINE__);
3072                         dic = NULL;
3073                         break;
3074                 }
3075         }
3076
3077         if (!dic)
3078                 return 0;                       /* did not find */
3079
3080         /* if the result is on stack or iaccess then it must be
3081         the same at least one of the operands */
3082         if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3083                 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3084         {
3085
3086         /* the operation has only one symbol
3087                 operator then we can pack */
3088                 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3089                         (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3090                         goto pack;
3091
3092                 if (!((IC_LEFT (dic) &&
3093                         IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3094                         (IC_RIGHT (dic) &&
3095                         IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3096                         return 0;
3097         }
3098 pack:
3099         debugLog ("  packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3100         debugLog ("  replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3101         /* found the definition */
3102         /* replace the result with the result of */
3103         /* this assignment and remove this assignment */
3104         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3105         IC_RESULT (dic) = IC_RESULT (ic);
3106
3107         if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3108         {
3109                 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3110         }
3111         /* delete from liverange table also
3112         delete from all the points inbetween and the new
3113         one */
3114         for (sic = dic; sic != ic; sic = sic->next)
3115         {
3116                 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3117                 if (IS_ITEMP (IC_RESULT (dic)))
3118                         bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3119         }
3120
3121         remiCodeFromeBBlock (ebp, ic);
3122         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3123         hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3124         OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3125         return 1;
3126
3127
3128 }
3129
3130 /*-----------------------------------------------------------------*/
3131 /* findAssignToSym : scanning backwards looks for first assig found */
3132 /*-----------------------------------------------------------------*/
3133 static iCode *
3134 findAssignToSym (operand * op, iCode * ic)
3135 {
3136         iCode *dic;
3137
3138         debugLog ("%s\n", __FUNCTION__);
3139         for (dic = ic->prev; dic; dic = dic->prev)
3140         {
3141
3142                 /* if definition by assignment */
3143                 if (dic->op == '=' &&
3144                         !POINTER_SET (dic) &&
3145                         IC_RESULT (dic)->key == op->key
3146                         /*          &&  IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3147                         )
3148                 {
3149
3150                         /* we are interested only if defined in far space */
3151                         /* or in stack space in case of + & - */
3152
3153                         /* if assigned to a non-symbol then return
3154                         true */
3155                         if (!IS_SYMOP (IC_RIGHT (dic)))
3156                                 break;
3157
3158                                 /* if the symbol is in far space then
3159                         we should not */
3160                         if (isOperandInFarSpace (IC_RIGHT (dic)))
3161                                 return NULL;
3162
3163                                 /* for + & - operations make sure that
3164                                 if it is on the stack it is the same
3165                         as one of the three operands */
3166                         if ((ic->op == '+' || ic->op == '-') &&
3167                                 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3168                         {
3169
3170                                 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3171                                         IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3172                                         IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3173                                         return NULL;
3174                         }
3175
3176                         break;
3177
3178                 }
3179
3180                 /* if we find an usage then we cannot delete it */
3181                 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3182                         return NULL;
3183
3184                 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3185                         return NULL;
3186
3187                 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3188                         return NULL;
3189         }
3190
3191         /* now make sure that the right side of dic
3192         is not defined between ic & dic */
3193         if (dic)
3194         {
3195                 iCode *sic = dic->next;
3196
3197                 for (; sic != ic; sic = sic->next)
3198                         if (IC_RESULT (sic) &&
3199                                 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3200                                 return NULL;
3201         }
3202
3203         return dic;
3204
3205
3206 }
3207
3208 /*-----------------------------------------------------------------*/
3209 /* packRegsForSupport :- reduce some registers for support calls   */
3210 /*-----------------------------------------------------------------*/
3211 static int
3212 packRegsForSupport (iCode * ic, eBBlock * ebp)
3213 {
3214         int change = 0;
3215
3216         debugLog ("%s\n", __FUNCTION__);
3217         /* for the left & right operand :- look to see if the
3218         left was assigned a true symbol in far space in that
3219         case replace them */
3220         if (IS_ITEMP (IC_LEFT (ic)) &&
3221                 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3222         {
3223                 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3224                 iCode *sic;
3225
3226                 if (!dic)
3227                         goto right;
3228
3229                 debugAopGet ("removing left:", IC_LEFT (ic));
3230
3231                 /* found it we need to remove it from the
3232                 block */
3233                 for (sic = dic; sic != ic; sic = sic->next)
3234                         bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3235
3236                 IC_LEFT (ic)->operand.symOperand =
3237                         IC_RIGHT (dic)->operand.symOperand;
3238                 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3239                 remiCodeFromeBBlock (ebp, dic);
3240                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3241                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3242                 change++;
3243         }
3244
3245         /* do the same for the right operand */
3246 right:
3247         if (!change &&
3248                 IS_ITEMP (IC_RIGHT (ic)) &&
3249                 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3250         {
3251                 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3252                 iCode *sic;
3253
3254                 if (!dic)
3255                         return change;
3256
3257                         /* if this is a subtraction & the result
3258                 is a true symbol in far space then don't pack */
3259                 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3260                 {
3261                         sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3262                         if (IN_FARSPACE (SPEC_OCLS (etype)))
3263                                 return change;
3264                 }
3265
3266                 debugAopGet ("removing right:", IC_RIGHT (ic));
3267
3268                 /* found it we need to remove it from the
3269                 block */
3270                 for (sic = dic; sic != ic; sic = sic->next)
3271                         bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3272
3273                 IC_RIGHT (ic)->operand.symOperand =
3274                         IC_RIGHT (dic)->operand.symOperand;
3275                 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3276
3277                 remiCodeFromeBBlock (ebp, dic);
3278                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3279                 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3280                 change++;
3281         }
3282
3283         return change;
3284 }
3285
3286 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3287
3288
3289 /*-----------------------------------------------------------------*/
3290 /* packRegsForOneuse : - will reduce some registers for single Use */
3291 /*-----------------------------------------------------------------*/
3292 static iCode *
3293 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3294 {
3295         bitVect *uses;
3296         iCode *dic, *sic;
3297
3298         debugLog ("%s\n", __FUNCTION__);
3299         /* if returning a literal then do nothing */
3300         if (!IS_SYMOP (op))
3301                 return NULL;
3302
3303         /* only upto 2 bytes since we cannot predict
3304         the usage of b, & acc */
3305         if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3306                 ic->op != RETURN &&
3307                 ic->op != SEND)
3308                 return NULL;
3309
3310         /* this routine will mark the a symbol as used in one
3311         instruction use only && if the definition is local
3312         (ie. within the basic block) && has only one definition &&
3313         that definition is either a return value from a
3314         function or does not contain any variables in
3315         far space */
3316         uses = bitVectCopy (OP_USES (op));
3317         bitVectUnSetBit (uses, ic->key);        /* take away this iCode */
3318         if (!bitVectIsZero (uses))      /* has other uses */
3319                 return NULL;
3320
3321         /* if it has only one defintion */
3322         if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3323                 return NULL;            /* has more than one definition */
3324
3325         /* get that definition */
3326         if (!(dic =
3327                 hTabItemWithKey (iCodehTab,
3328                 bitVectFirstBit (OP_DEFS (op)))))
3329                 return NULL;
3330
3331         /* found the definition now check if it is local */
3332         if (dic->seq < ebp->fSeq ||
3333                 dic->seq > ebp->lSeq)
3334                 return NULL;            /* non-local */
3335
3336                                                         /* now check if it is the return from
3337         a function call */
3338         if (dic->op == CALL || dic->op == PCALL)
3339         {
3340                 if (ic->op != SEND && ic->op != RETURN &&
3341                         !POINTER_SET(ic) && !POINTER_GET(ic))
3342                 {
3343                         OP_SYMBOL (op)->ruonly = 1;
3344                         return dic;
3345                 }
3346                 dic = dic->next;
3347         }
3348
3349
3350         /* otherwise check that the definition does
3351         not contain any symbols in far space */
3352         if (isOperandInFarSpace (IC_LEFT (dic)) ||
3353                 isOperandInFarSpace (IC_RIGHT (dic)) ||
3354                 IS_OP_RUONLY (IC_LEFT (ic)) ||
3355                 IS_OP_RUONLY (IC_RIGHT (ic)))
3356         {
3357                 return NULL;
3358         }
3359
3360         /* if pointer set then make sure the pointer
3361         is one byte */
3362         if (POINTER_SET (dic) &&
3363                 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3364                 return NULL;
3365
3366         if (POINTER_GET (dic) &&
3367                 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3368                 return NULL;
3369
3370         sic = dic;
3371
3372         /* also make sure the intervenening instructions
3373         don't have any thing in far space */
3374         for (dic = dic->next; dic && dic != ic; dic = dic->next)
3375         {
3376
3377                 /* if there is an intervening function call then no */
3378                 if (dic->op == CALL || dic->op == PCALL)
3379                         return NULL;
3380                         /* if pointer set then make sure the pointer
3381                 is one byte */
3382                 if (POINTER_SET (dic) &&
3383                         !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3384                         return NULL;
3385
3386                 if (POINTER_GET (dic) &&
3387                         !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3388                         return NULL;
3389
3390                 /* if address of & the result is remat then okay */
3391                 if (dic->op == ADDRESS_OF &&
3392                         OP_SYMBOL (IC_RESULT (dic))->remat)
3393                         continue;
3394
3395                         /* if operand has size of three or more & this
3396                         operation is a '*','/' or '%' then 'b' may
3397                 cause a problem */
3398                 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3399                         getSize (operandType (op)) >= 3)
3400                         return NULL;
3401
3402                 /* if left or right or result is in far space */
3403                 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3404                         isOperandInFarSpace (IC_RIGHT (dic)) ||
3405                         isOperandInFarSpace (IC_RESULT (dic)) ||
3406                         IS_OP_RUONLY (IC_LEFT (dic)) ||
3407                         IS_OP_RUONLY (IC_RIGHT (dic)) ||
3408                         IS_OP_RUONLY (IC_RESULT (dic)))
3409                 {
3410                         return NULL;
3411                 }
3412         }
3413
3414         OP_SYMBOL (op)->ruonly = 1;
3415         return sic;
3416
3417 }
3418
3419 /*-----------------------------------------------------------------*/
3420 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN          */
3421 /*-----------------------------------------------------------------*/
3422 static bool
3423 isBitwiseOptimizable (iCode * ic)
3424 {
3425         sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3426         sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3427
3428         debugLog ("%s\n", __FUNCTION__);
3429         /* bitwise operations are considered optimizable
3430         under the following conditions (Jean-Louis VERN)
3431
3432           x & lit
3433           bit & bit
3434           bit & x
3435           bit ^ bit
3436           bit ^ x
3437           x   ^ lit
3438           x   | lit
3439           bit | bit
3440           bit | x
3441         */
3442         if (IS_LITERAL (rtype) ||
3443                 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3444                 return TRUE;
3445         else
3446                 return FALSE;
3447 }
3448
3449 /*-----------------------------------------------------------------*/
3450 /* packRegsForAccUse - pack registers for acc use                  */
3451 /*-----------------------------------------------------------------*/
3452 static void
3453 packRegsForAccUse (iCode * ic)
3454 {
3455         //iCode *uic;
3456
3457         debugLog ("%s\n", __FUNCTION__);
3458
3459         /* result too large for WREG? */
3460         if (getSize (operandType (IC_RESULT (ic))) > 1)
3461           return;
3462
3463         /* We have to make sure that OP_SYMBOL(IC_RESULT(ic))
3464          * is never used as an operand to an instruction that
3465          * cannot have WREG as an operand (e.g. BTFSx cannot
3466          * operate on WREG...
3467          * For now, store all results into proper registers. */
3468         return;
3469
3470 #if 0
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 #endif
3608 }
3609
3610 /*-----------------------------------------------------------------*/
3611 /* packForPush - hueristics to reduce iCode for pushing            */
3612 /*-----------------------------------------------------------------*/
3613 static void
3614 packForReceive (iCode * ic, eBBlock * ebp)
3615 {
3616         iCode *dic;
3617
3618         debugLog ("%s\n", __FUNCTION__);
3619         debugAopGet ("  result:", IC_RESULT (ic));
3620         debugAopGet ("  left:", IC_LEFT (ic));
3621         debugAopGet ("  right:", IC_RIGHT (ic));
3622
3623         if (!ic->next)
3624                 return;
3625
3626         for (dic = ic->next; dic; dic = dic->next)
3627         {
3628
3629
3630
3631                 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3632                         debugLog ("    used on left\n");
3633                 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3634                         debugLog ("    used on right\n");
3635                 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3636                         debugLog ("    used on result\n");
3637
3638                 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3639                         (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3640                         return;
3641
3642         }
3643
3644         debugLog ("  hey we can remove this unnecessary assign\n");
3645 }
3646 /*-----------------------------------------------------------------*/
3647 /* packForPush - hueristics to reduce iCode for pushing            */
3648 /*-----------------------------------------------------------------*/
3649 static void
3650 packForPush (iCode * ic, eBBlock * ebp)
3651 {
3652         iCode *dic;
3653
3654         debugLog ("%s\n", __FUNCTION__);
3655         if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3656                 return;
3657
3658         /* must have only definition & one usage */
3659         if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3660                 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3661                 return;
3662
3663         /* find the definition */
3664         if (!(dic = hTabItemWithKey (iCodehTab,
3665                 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3666                 return;
3667
3668         if (dic->op != '=' || POINTER_SET (dic))
3669                 return;
3670
3671                 /* we now we know that it has one & only one def & use
3672         and the that the definition is an assignment */
3673         IC_LEFT (ic) = IC_RIGHT (dic);
3674
3675         remiCodeFromeBBlock (ebp, dic);
3676         bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3677         hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3678 }
3679
3680 void printSymType(char * str, sym_link *sl)
3681 {
3682         debugLog ("    %s Symbol type: ",str);
3683         printTypeChain( sl, debugF);
3684         debugLog ("\n");
3685
3686 }
3687
3688 /*-----------------------------------------------------------------*/
3689 /* some debug code to print the symbol S_TYPE. Note that
3690 * the function checkSClass in src/SDCCsymt.c dinks with
3691 * the S_TYPE in ways the PIC port doesn't fully like...*/
3692 /*-----------------------------------------------------------------*/
3693 void isData(sym_link *sl)
3694 {
3695         FILE *of = stderr;
3696
3697         if(!sl)
3698                 return;
3699
3700         if(debugF)
3701                 of = debugF;
3702
3703         for ( ; sl; sl=sl->next) {
3704                 if(!IS_DECL(sl) ) {
3705                         switch (SPEC_SCLS(sl)) {
3706
3707                         case S_DATA: fprintf (of, "data "); break;
3708                         case S_XDATA: fprintf (of, "xdata "); break;
3709                         case S_SFR: fprintf (of, "sfr "); break;
3710                         case S_SBIT: fprintf (of, "sbit "); break;
3711                         case S_CODE: fprintf (of, "code "); break;
3712                         case S_IDATA: fprintf (of, "idata "); break;
3713                         case S_PDATA: fprintf (of, "pdata "); break;
3714                         case S_LITERAL: fprintf (of, "literal "); break;
3715                         case S_STACK: fprintf (of, "stack "); break;
3716                         case S_XSTACK: fprintf (of, "xstack "); break;
3717                         case S_BIT: fprintf (of, "bit "); break;
3718                         case S_EEPROM: fprintf (of, "eeprom "); break;
3719                         default: break;
3720                         }
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                 /* Look for two subsequent iCodes with */
3802                 /*   iTemp := _c;         */
3803                 /*   _c = iTemp & op;     */
3804                 /* and replace them by    */
3805                 /*   iTemp := _c;         */
3806                 /*   _c = _c & op;        */
3807                 if ((ic->op == BITWISEAND || ic->op == '|' || ic->op == '^') &&
3808                         ic->prev &&
3809                         ic->prev->op == '=' &&
3810                         IS_ITEMP (IC_LEFT (ic)) &&
3811                         IC_LEFT (ic) == IC_RESULT (ic->prev) &&
3812                         isOperandEqual (IC_RESULT(ic), IC_RIGHT(ic->prev)))
3813         {
3814                         iCode* ic_prev = ic->prev;
3815                         symbol* prev_result_sym = OP_SYMBOL (IC_RESULT (ic_prev));
3816
3817                         ReplaceOpWithCheaperOp (&IC_LEFT (ic), IC_RESULT (ic));
3818                         if (IC_RESULT (ic_prev) != IC_RIGHT (ic))
3819             {
3820                                 bitVectUnSetBit (OP_USES (IC_RESULT (ic_prev)), ic->key);
3821                                 if (/*IS_ITEMP (IC_RESULT (ic_prev)) && */
3822                                         prev_result_sym->liveTo == ic->seq)
3823                 {
3824                                         prev_result_sym->liveTo = ic_prev->seq;
3825                 }
3826             }
3827                         bitVectSetBit (OP_USES (IC_RESULT (ic)), ic->key);
3828
3829                         bitVectSetBit (ic->rlive, IC_RESULT (ic)->key);
3830
3831                         if (bitVectIsZero (OP_USES (IC_RESULT (ic_prev))))
3832             {
3833                                 bitVectUnSetBit (ic->rlive, IC_RESULT (ic)->key);
3834                                 bitVectUnSetBit (OP_DEFS (IC_RESULT (ic_prev)), ic_prev->key);
3835                                 remiCodeFromeBBlock (ebp, ic_prev);
3836                                 hTabDeleteItem (&iCodehTab, ic_prev->key, ic_prev, DELETE_ITEM, NULL);
3837             }
3838         }
3839
3840                 /* if this is an itemp & result of a address of a true sym
3841                 then mark this as rematerialisable   */
3842                 if (ic->op == ADDRESS_OF &&
3843                         IS_ITEMP (IC_RESULT (ic)) &&
3844                         IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3845                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3846                         !OP_SYMBOL (IC_LEFT (ic))->onStack)
3847                 {
3848
3849                         debugLog ("  %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3850
3851                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3852                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3853                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3854
3855                 }
3856
3857                 /* if straight assignment then carry remat flag if
3858                 this is the only definition */
3859                 if (ic->op == '=' &&
3860                         !POINTER_SET (ic) &&
3861                         IS_SYMOP (IC_RIGHT (ic)) &&
3862                         OP_SYMBOL (IC_RIGHT (ic))->remat &&
3863                         bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3864                 {
3865                         debugLog ("  %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3866
3867                         OP_SYMBOL (IC_RESULT (ic))->remat =
3868                                 OP_SYMBOL (IC_RIGHT (ic))->remat;
3869                         OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3870                                 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3871                 }
3872
3873                 /* if this is a +/- operation with a rematerizable
3874                 then mark this as rematerializable as well */
3875                 if ((ic->op == '+' || ic->op == '-') &&
3876                         (IS_SYMOP (IC_LEFT (ic)) &&
3877                         IS_ITEMP (IC_RESULT (ic)) &&
3878                         OP_SYMBOL (IC_LEFT (ic))->remat &&
3879                         bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3880                         IS_OP_LITERAL (IC_RIGHT (ic))))
3881                 {
3882                         debugLog ("  %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3883                         //int i =
3884                         operandLitValue (IC_RIGHT (ic));
3885                         OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3886                         OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3887                         OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3888                 }
3889
3890                 /* mark the pointer usages */
3891                 if (POINTER_SET (ic) && IS_SYMOP(IC_RESULT(ic)))
3892                 {
3893                         OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3894                         debugLog ("  marking as a pointer (set) =>");
3895                         debugAopGet ("  result:", IC_RESULT (ic));
3896                 }
3897                 if (POINTER_GET (ic) && IS_SYMOP(IC_LEFT(ic)))
3898                 {
3899                         OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3900                         debugLog ("  marking as a pointer (get) =>");
3901                         debugAopGet ("  left:", IC_LEFT (ic));
3902                 }
3903
3904                 if (!SKIP_IC2 (ic))
3905                 {
3906                         /* if we are using a symbol on the stack
3907                         then we should say pic14_ptrRegReq */
3908                         if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3909                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3910                                 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3911                         else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3912                                 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3913                                 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3914                         else
3915                         {
3916                                 if (IS_SYMOP (IC_LEFT (ic)))
3917                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3918                                         OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3919                                 if (IS_SYMOP (IC_RIGHT (ic)))
3920                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3921                                         OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3922                                 if (IS_SYMOP (IC_RESULT (ic)))
3923                                         pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3924                                         OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3925                         }
3926
3927                         debugLog ("  %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3928
3929                 }
3930
3931                 /* if the condition of an if instruction
3932                 is defined in the previous instruction then
3933                 mark the itemp as a conditional */
3934                 if ((IS_CONDITIONAL (ic) ||
3935                         ((ic->op == BITWISEAND ||
3936                         ic->op == '|' ||
3937                         ic->op == '^') &&
3938                         isBitwiseOptimizable (ic))) &&
3939                         ic->next && ic->next->op == IFX &&
3940                         isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3941                         OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3942                 {
3943
3944                         debugLog ("  %d\n", __LINE__);
3945                         OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3946                         continue;
3947                 }
3948
3949                 /* reduce for support function calls */
3950                 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3951                         packRegsForSupport (ic, ebp);
3952
3953                 /* if a parameter is passed, it's in W, so we may not
3954                 need to place a copy in a register */
3955                 if (ic->op == RECEIVE)
3956                         packForReceive (ic, ebp);
3957
3958                 /* some cases the redundant moves can
3959                 can be eliminated for return statements */
3960                 if ((ic->op == RETURN || ic->op == SEND) &&
3961                         !isOperandInFarSpace (IC_LEFT (ic)) &&
3962                         !options.model)
3963                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3964
3965                 /* if pointer set & left has a size more than
3966                 one and right is not in far space */
3967                 if (POINTER_SET (ic) &&
3968                         !isOperandInFarSpace (IC_RIGHT (ic)) &&
3969                         IS_SYMOP(IC_RESULT(ic)) &&
3970                         !OP_SYMBOL (IC_RESULT (ic))->remat &&
3971                         !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3972                         getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3973
3974                         packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3975
3976                 /* if pointer get */
3977                 if (POINTER_GET (ic) &&
3978                         !isOperandInFarSpace (IC_RESULT (ic)) &&
3979                         IS_SYMOP(IC_LEFT(ic)) &&
3980                         !OP_SYMBOL (IC_LEFT (ic))->remat &&
3981                         !IS_OP_RUONLY (IC_RESULT (ic)) &&
3982                         getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3983
3984                         packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3985
3986
3987                 /* if this is cast for intergral promotion then
3988                 check if only use of  the definition of the
3989                 operand being casted/ if yes then replace
3990                 the result of that arithmetic operation with
3991                 this result and get rid of the cast */
3992                 if (ic->op == CAST) {
3993
3994                         sym_link *fromType = operandType (IC_RIGHT (ic));
3995                         sym_link *toType = operandType (IC_LEFT (ic));
3996
3997                         debugLog ("  %d - casting\n", __LINE__);
3998
3999                         if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
4000                                 getSize (fromType) != getSize (toType)) {
4001
4002
4003                                 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
4004                                 if (dic) {
4005
4006                                         if (IS_ARITHMETIC_OP (dic)) {
4007
4008                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
4009                                                 IC_RESULT (dic) = IC_RESULT (ic);
4010                                                 remiCodeFromeBBlock (ebp, ic);
4011                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
4012                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
4013                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
4014                                                 ic = ic->prev;
4015                                         }  else
4016
4017                                                 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
4018                                 }
4019                         } else {
4020
4021                                 /* if the type from and type to are the same
4022                                 then if this is the only use then packit */
4023                                 if (compareType (operandType (IC_RIGHT (ic)),
4024                                         operandType (IC_LEFT (ic))) == 1) {
4025
4026                                         iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
4027                                         if (dic) {
4028
4029                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
4030                                                 IC_RESULT (dic) = IC_RESULT (ic);
4031                                                 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
4032                                                 remiCodeFromeBBlock (ebp, ic);
4033                                                 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
4034                                                 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
4035                                                 ic = ic->prev;
4036                                         }
4037                                 }
4038                         }
4039                 }
4040
4041                 /* pack for PUSH
4042                 iTempNN := (some variable in farspace) V1
4043                 push iTempNN ;
4044                 -------------
4045                 push V1
4046                 */
4047                 if (ic->op == IPUSH)
4048                 {
4049                         packForPush (ic, ebp);
4050                 }
4051
4052
4053                 /* pack registers for accumulator use, when the
4054                 result of an arithmetic or bit wise operation
4055                 has only one use, that use is immediately following
4056                 the defintion and the using iCode has only one
4057                 operand or has two operands but one is literal &
4058                 the result of that operation is not on stack then
4059                 we can leave the result of this operation in acc:b
4060                 combination */
4061                 if ((IS_ARITHMETIC_OP (ic)
4062
4063                         || IS_BITWISE_OP (ic)
4064
4065                         || ic->op == LEFT_OP || ic->op == RIGHT_OP
4066
4067                         ) &&
4068                         IS_ITEMP (IC_RESULT (ic)) &&
4069                         getSize (operandType (IC_RESULT (ic))) <= 2)
4070
4071                         packRegsForAccUse (ic);
4072
4073         }
4074 }
4075
4076 static void
4077 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4078 {
4079         int i;
4080
4081         if (!debug || !debugF)
4082                 return;
4083
4084         for (i = 0; i < count; i++)
4085         {
4086                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4087                 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4088                         ebbs[i]->entryLabel->name,
4089                         ebbs[i]->depth,
4090                         ebbs[i]->noPath,
4091                         ebbs[i]->isLastInLoop);
4092                 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4093                         ebbs[i]->dfnum,
4094                         ebbs[i]->bbnum,
4095                         ebbs[i]->fSeq,
4096                         ebbs[i]->lSeq);
4097                 fprintf (debugF, "visited %d : hasFcall = %d\n",
4098                         ebbs[i]->visited,
4099                         ebbs[i]->hasFcall);
4100
4101                 fprintf (debugF, "\ndefines bitVector :");
4102                 bitVectDebugOn (ebbs[i]->defSet, debugF);
4103                 fprintf (debugF, "\nlocal defines bitVector :");
4104                 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4105                 fprintf (debugF, "\npointers Set bitvector :");
4106                 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4107                 fprintf (debugF, "\nin pointers Set bitvector :");
4108                 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4109                 fprintf (debugF, "\ninDefs Set bitvector :");
4110                 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4111                 fprintf (debugF, "\noutDefs Set bitvector :");
4112                 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4113                 fprintf (debugF, "\nusesDefs Set bitvector :");
4114                 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4115                 fprintf (debugF, "\n----------------------------------------------------------------\n");
4116                 printiCChain (ebbs[i]->sch, debugF);
4117         }
4118 }
4119 /*-----------------------------------------------------------------*/
4120 /* assignRegisters - assigns registers to each live range as need  */
4121 /*-----------------------------------------------------------------*/
4122 void
4123 pic14_assignRegisters (ebbIndex * ebbi)
4124 {
4125         eBBlock ** ebbs = ebbi->bbOrder;
4126         int count = ebbi->count;
4127         iCode *ic;
4128         int i;
4129
4130         debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4131         debugLog ("\nebbs before optimizing:\n");
4132         dumpEbbsToDebug (ebbs, count);
4133
4134         setToNull ((void *) &_G.funcrUsed);
4135         pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4136
4137
4138         /* change assignments this will remove some
4139         live ranges reducing some register pressure */
4140         for (i = 0; i < count; i++)
4141                 packRegisters (ebbs[i]);
4142
4143         {
4144                 regs *reg;
4145                 int hkey;
4146                 int i=0;
4147
4148                 debugLog("dir registers allocated so far:\n");
4149                 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4150
4151                 while(reg) {
4152                         debugLog("  -- #%d reg = %s  key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4153                         reg = hTabNextItem(dynDirectRegNames, &hkey);
4154                 }
4155
4156         }
4157
4158         if (options.dump_pack)
4159                 dumpEbbsToFileExt (DUMP_PACK, ebbi);
4160
4161         /* first determine for each live range the number of
4162         registers & the type of registers required for each */
4163         regTypeNum ();
4164
4165         /* and serially allocate registers */
4166         serialRegAssign (ebbs, count);
4167
4168         /* if stack was extended then tell the user */
4169         if (_G.stackExtend)
4170         {
4171                 /*      werror(W_TOOMANY_SPILS,"stack", */
4172                 /*             _G.stackExtend,currFunc->name,""); */
4173                 _G.stackExtend = 0;
4174         }
4175
4176         if (_G.dataExtend)
4177         {
4178                 /*      werror(W_TOOMANY_SPILS,"data space", */
4179                 /*             _G.dataExtend,currFunc->name,""); */
4180                 _G.dataExtend = 0;
4181         }
4182
4183         /* after that create the register mask
4184         for each of the instruction */
4185         createRegMask (ebbs, count);
4186
4187         /* redo that offsets for stacked automatic variables */
4188         redoStackOffsets ();
4189
4190         if (options.dump_rassgn)
4191                 dumpEbbsToFileExt (DUMP_RASSGN, ebbi);
4192
4193         /* now get back the chain */
4194         ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4195
4196         debugLog ("ebbs after optimizing:\n");
4197         dumpEbbsToDebug (ebbs, count);
4198
4199
4200         genpic14Code (ic);
4201
4202         /* free up any _G.stackSpil locations allocated */
4203         applyToSet (_G.stackSpil, deallocStackSpil);
4204         _G.slocNum = 0;
4205         setToNull ((void *) &_G.stackSpil);
4206         setToNull ((void *) &_G.spiltSet);
4207         /* mark all registers as free */
4208         //pic14_freeAllRegs ();
4209
4210         debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");
4211         debugLogClose ();
4212         return;
4213 }