1 /*------------------------------------------------------------------------
3 ralloc.c - source file for register allocation. PIC16 specific
5 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998)
6 Added Pic Port T.scott Dattalo scott@dattalo.com (2000)
7 Added Pic16 Port Martin Dubuc m.dubuc@rogers.com (2002)
9 This program is free software; you can redistribute it and/or modify it
10 under the terms of the GNU General Public License as published by the
11 Free Software Foundation; either version 2, or (at your option) any
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 In other words, you are welcome to use, share and improve this program.
24 You are forbidden to forbid anyone else to use, share and improve
25 what you give them. Help stamp out software-hoarding!
26 -------------------------------------------------------------------------*/
34 #if defined(__BORLANDC__) || defined(_MSC_VER)
35 #define STRCASECMP stricmp
37 #define STRCASECMP strcasecmp
40 /*-----------------------------------------------------------------*/
41 /* At this point we start getting processor specific although */
42 /* some routines are non-processor specific & can be reused when */
43 /* targetting other processors. The decision for this will have */
44 /* to be made on a routine by routine basis */
45 /* routines used to pack registers are most definitely not reusable */
46 /* since the pack the registers depending strictly on the MCU */
47 /*-----------------------------------------------------------------*/
49 regs *pic16_typeRegWithIdx (int idx, int type, int fixed);
50 extern void genpic16Code (iCode *);
51 extern void pic16_assignConfigWordValue(int address, int value);
61 bitVect *funcrUsed; /* registers used in a function */
67 /* Shared with gen.c */
68 int pic16_ptrRegReq; /* one byte pointer register required */
71 set *pic16_dynAllocRegs=NULL;
72 set *pic16_dynStackRegs=NULL;
73 set *pic16_dynProcessorRegs=NULL;
74 set *pic16_dynDirectRegs=NULL;
75 set *pic16_dynDirectBitRegs=NULL;
76 set *pic16_dynInternalRegs=NULL;
78 static hTab *dynDirectRegNames= NULL;
79 //static hTab *regHash = NULL; /* a hash table containing ALL registers */
81 set *pic16_rel_udata=NULL; /* relocatable uninitialized registers */
82 set *pic16_fix_udata=NULL; /* absolute uninitialized registers */
83 set *pic16_equ_data=NULL; /* registers used by equates */
84 set *pic16_int_regs=NULL; /* internal registers placed in access bank 0 to 0x7f */
86 set *pic16_builtin_functions=NULL;
88 static int dynrIdx=0x10; //0x20; // starting temporary register rIdx
89 static int rDirectIdx=0;
91 int pic16_nRegs = 128; // = sizeof (regspic16) / sizeof (regs);
93 int pic16_Gstack_base_addr=0; /* The starting address of registers that
94 * are used to pass and return parameters */
99 static void spillThis (symbol *);
100 int pic16_ralloc_debug = 0;
101 static FILE *debugF = NULL;
102 /*-----------------------------------------------------------------*/
103 /* debugLog - open a file for debugging information */
104 /*-----------------------------------------------------------------*/
105 //static void debugLog(char *inst,char *fmt, ...)
107 debugLog (char *fmt,...)
109 static int append = 0; // First time through, open the file without append.
112 //char *bufferP=buffer;
115 if (!pic16_ralloc_debug || !dstFileName)
121 /* create the file name */
122 strcpy (buffer, dstFileName);
123 strcat (buffer, ".d");
125 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
127 werror (E_FILE_OPEN_ERR, buffer);
130 append = 1; // Next time debubLog is called, we'll append the debug info
136 vsprintf (buffer, fmt, ap);
138 fprintf (debugF, "%s", buffer);
140 while (isspace(*bufferP)) bufferP++;
142 if (bufferP && *bufferP)
143 lineCurr = (lineCurr ?
144 connectLine(lineCurr,newLineNode(lb)) :
145 (lineHead = newLineNode(lb)));
146 lineCurr->isInline = _G.inLine;
147 lineCurr->isDebug = _G.debugLine;
156 if(!pic16_ralloc_debug)return;
159 fputc ('\n', debugF);
161 /*-----------------------------------------------------------------*/
162 /* debugLogClose - closes the debug log file (if opened) */
163 /*-----------------------------------------------------------------*/
173 #define AOP(op) op->aop
176 debugAopGet (char *str, operand * op)
178 if(!pic16_ralloc_debug)return NULL;
183 printOperand (op, debugF);
190 decodeOp (unsigned int op)
192 if (op < 128 && op > ' ') {
193 buffer[0] = (op & 0xff);
199 case IDENTIFIER: return "IDENTIFIER";
200 case TYPE_NAME: return "TYPE_NAME";
201 case CONSTANT: return "CONSTANT";
202 case STRING_LITERAL: return "STRING_LITERAL";
203 case SIZEOF: return "SIZEOF";
204 case PTR_OP: return "PTR_OP";
205 case INC_OP: return "INC_OP";
206 case DEC_OP: return "DEC_OP";
207 case LEFT_OP: return "LEFT_OP";
208 case RIGHT_OP: return "RIGHT_OP";
209 case LE_OP: return "LE_OP";
210 case GE_OP: return "GE_OP";
211 case EQ_OP: return "EQ_OP";
212 case NE_OP: return "NE_OP";
213 case AND_OP: return "AND_OP";
214 case OR_OP: return "OR_OP";
215 case MUL_ASSIGN: return "MUL_ASSIGN";
216 case DIV_ASSIGN: return "DIV_ASSIGN";
217 case MOD_ASSIGN: return "MOD_ASSIGN";
218 case ADD_ASSIGN: return "ADD_ASSIGN";
219 case SUB_ASSIGN: return "SUB_ASSIGN";
220 case LEFT_ASSIGN: return "LEFT_ASSIGN";
221 case RIGHT_ASSIGN: return "RIGHT_ASSIGN";
222 case AND_ASSIGN: return "AND_ASSIGN";
223 case XOR_ASSIGN: return "XOR_ASSIGN";
224 case OR_ASSIGN: return "OR_ASSIGN";
225 case TYPEDEF: return "TYPEDEF";
226 case EXTERN: return "EXTERN";
227 case STATIC: return "STATIC";
228 case AUTO: return "AUTO";
229 case REGISTER: return "REGISTER";
230 case CODE: return "CODE";
231 case EEPROM: return "EEPROM";
232 case INTERRUPT: return "INTERRUPT";
233 case SFR: return "SFR";
234 case AT: return "AT";
235 case SBIT: return "SBIT";
236 case REENTRANT: return "REENTRANT";
237 case USING: return "USING";
238 case XDATA: return "XDATA";
239 case DATA: return "DATA";
240 case IDATA: return "IDATA";
241 case PDATA: return "PDATA";
242 case VAR_ARGS: return "VAR_ARGS";
243 case CRITICAL: return "CRITICAL";
244 case NONBANKED: return "NONBANKED";
245 case BANKED: return "BANKED";
246 case CHAR: return "CHAR";
247 case SHORT: return "SHORT";
248 case INT: return "INT";
249 case LONG: return "LONG";
250 case SIGNED: return "SIGNED";
251 case UNSIGNED: return "UNSIGNED";
252 case FLOAT: return "FLOAT";
253 case DOUBLE: return "DOUBLE";
254 case CONST: return "CONST";
255 case VOLATILE: return "VOLATILE";
256 case VOID: return "VOID";
257 case BIT: return "BIT";
258 case STRUCT: return "STRUCT";
259 case UNION: return "UNION";
260 case ENUM: return "ENUM";
261 case ELIPSIS: return "ELIPSIS";
262 case RANGE: return "RANGE";
263 case FAR: return "FAR";
264 case CASE: return "CASE";
265 case DEFAULT: return "DEFAULT";
266 case IF: return "IF";
267 case ELSE: return "ELSE";
268 case SWITCH: return "SWITCH";
269 case WHILE: return "WHILE";
270 case DO: return "DO";
271 case FOR: return "FOR";
272 case GOTO: return "GOTO";
273 case CONTINUE: return "CONTINUE";
274 case BREAK: return "BREAK";
275 case RETURN: return "RETURN";
276 case INLINEASM: return "INLINEASM";
277 case IFX: return "IFX";
278 case ADDRESS_OF: return "ADDRESS_OF";
279 case GET_VALUE_AT_ADDRESS: return "GET_VALUE_AT_ADDRESS";
280 case SPIL: return "SPIL";
281 case UNSPIL: return "UNSPIL";
282 case GETHBIT: return "GETHBIT";
283 case BITWISEAND: return "BITWISEAND";
284 case UNARYMINUS: return "UNARYMINUS";
285 case IPUSH: return "IPUSH";
286 case IPOP: return "IPOP";
287 case PCALL: return "PCALL";
288 case ENDFUNCTION: return "ENDFUNCTION";
289 case JUMPTABLE: return "JUMPTABLE";
290 case RRC: return "RRC";
291 case RLC: return "RLC";
292 case CAST: return "CAST";
293 case CALL: return "CALL";
294 case PARAM: return "PARAM ";
295 case NULLOP: return "NULLOP";
296 case BLOCK: return "BLOCK";
297 case LABEL: return "LABEL";
298 case RECEIVE: return "RECEIVE";
299 case SEND: return "SEND";
301 sprintf (buffer, "unkown op %d %c", op, op & 0xff);
305 /*-----------------------------------------------------------------*/
306 /*-----------------------------------------------------------------*/
308 debugLogRegType (short type)
310 if(!pic16_ralloc_debug)return NULL;
312 case REG_GPR: return "REG_GPR";
313 case REG_PTR: return "REG_PTR";
314 case REG_CND: return "REG_CND";
316 sprintf (buffer, "unknown reg type %d", type);
321 /*-----------------------------------------------------------------*/
322 /*-----------------------------------------------------------------*/
323 static int regname2key(char const *name)
332 key += (*name++) + 1;
336 return ( (key + (key >> 4) + (key>>8)) & 0x3f);
340 /*-----------------------------------------------------------------*/
341 /* newReg - allocate and init memory for a new register */
342 /*-----------------------------------------------------------------*/
343 regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias, operand *refop)
348 dReg = Safe_calloc(1,sizeof(regs));
350 dReg->pc_type = pc_type;
353 dReg->name = Safe_strdup(name);
355 sprintf(buffer,"r0x%02X", dReg->rIdx);
358 dReg->name = Safe_strdup(buffer);
366 if(type == REG_SFR) {
368 dReg->address = rIdx;
369 dReg->accessBank = 1;
373 dReg->accessBank = 0;
376 // fprintf(stderr,"newReg: %s, rIdx = 0x%02x\taccess= %d\n",dReg->name,rIdx, dReg->accessBank);
380 dReg->reg_alias = NULL;
381 dReg->reglives.usedpFlows = newSet();
382 dReg->reglives.assignedpFlows = newSet();
385 if(!(type == REG_SFR && alias == 0x80))
386 hTabAddItem(&dynDirectRegNames, regname2key(name), dReg);
391 /*-----------------------------------------------------------------*/
392 /* regWithIdx - Search through a set of registers that matches idx */
393 /*-----------------------------------------------------------------*/
395 regWithIdx (set *dRegs, int idx, int fixed)
399 for (dReg = setFirstItem(dRegs) ; dReg ;
400 dReg = setNextItem(dRegs)) {
402 if(idx == dReg->rIdx && (fixed == dReg->isFixed)) {
410 /*-----------------------------------------------------------------*/
411 /* regFindFree - Search for a free register in a set of registers */
412 /*-----------------------------------------------------------------*/
414 regFindFree (set *dRegs)
418 for (dReg = setFirstItem(dRegs) ; dReg ;
419 dReg = setNextItem(dRegs)) {
421 // fprintf(stderr, "%s:%d checking register %s (%p) [rIdx: 0x%02x] if free= %d\n",
422 // __FILE__, __LINE__, dReg->name, dReg, dReg->rIdx, dReg->isFree);
431 /*-----------------------------------------------------------------*/
432 /* pic16_initStack - allocate registers for a pseudo stack */
433 /*-----------------------------------------------------------------*/
434 void pic16_initStack(int base_address, int size)
439 pic16_Gstack_base_addr = base_address;
440 //fprintf(stderr,"initStack");
442 for(i = 0; i<size; i++)
443 addSet(&pic16_dynStackRegs,newReg(REG_STK, PO_GPR_TEMP,base_address++,NULL,1,0, NULL));
446 /*-----------------------------------------------------------------*
447 *-----------------------------------------------------------------*/
449 pic16_allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
451 regs *reg = newReg(REG_SFR, po_type, rIdx, name, 1, alias, NULL);
453 // fprintf(stderr,"%s: %s addr =0x%x\n",__FUNCTION__, name,rIdx);
455 reg->wasUsed = 0; // we do not know if they are going to be used at all
456 reg->accessBank = 1; // implicit add access Bank
458 return addSet(&pic16_dynProcessorRegs, reg);
461 /*-----------------------------------------------------------------*
462 *-----------------------------------------------------------------*/
465 pic16_allocInternalRegister(int rIdx, char * name, short po_type, int alias)
467 regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias, NULL);
469 // fprintf(stderr,"%s:%d: %s %s addr =0x%x\n",__FILE__, __LINE__, __FUNCTION__, name, rIdx);
473 return addSet(&pic16_dynInternalRegs,reg);
478 /*-----------------------------------------------------------------*/
479 /* allocReg - allocates register of given type */
480 /*-----------------------------------------------------------------*/
482 allocReg (short type)
487 if(dynrIdx > pic16_nRegs)
491 /* try to reuse some unused registers */
492 reg = regFindFree( pic16_dynAllocRegs );
495 // fprintf(stderr, "%s: found FREE register %s\n", __FILE__, reg->name);
499 reg = newReg(REG_GPR, PO_GPR_TEMP, dynrIdx++, NULL, 1, 0, NULL);
500 // addSet(&pic16_dynAllocRegs, reg);
503 addSet(&pic16_dynAllocRegs, reg);
507 // debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
509 // fprintf(stderr,"%s:%d: %s\t%s addr= 0x%x\trIdx= 0x%02x isFree: %d\n",
510 // __FILE__, __LINE__, __FUNCTION__, reg->name, reg->address, reg->rIdx, reg->isFree);
513 reg->accessBank = 1; /* this is a temporary register alloc in accessBank */
514 reg->isLocal = 1; /* this is a local frame register */
518 // fprintf(stderr, "%s:%d adding %s into function %s regsUsed\n", __FUNCTION__, __LINE__, reg->name, currFunc->name);
519 currFunc->regsUsed = bitVectSetBit (currFunc->regsUsed, reg->rIdx);
522 return (reg); // addSet(&pic16_dynAllocRegs,reg);
527 /*-----------------------------------------------------------------*/
528 /* pic16_dirregWithName - search for register by name */
529 /*-----------------------------------------------------------------*/
531 pic16_dirregWithName (char *name)
539 /* hash the name to get a key */
541 hkey = regname2key(name);
543 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
545 reg = hTabFirstItemWK(dynDirectRegNames, hkey);
549 if(STRCASECMP(reg->name, name) == 0) {
553 reg = hTabNextItemWK (dynDirectRegNames);
557 return NULL; // name wasn't found in the hash table
560 static int IS_CONFIG_ADDRESS(int address)
563 return address >= 0x300000 && address <= 0x300000d;
566 /*-----------------------------------------------------------------*/
567 /* pic16_allocDirReg - allocates register of given type */
568 /*-----------------------------------------------------------------*/
570 pic16_allocDirReg (operand *op )
576 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
577 // fprintf(stderr, "%s BAD, op is NULL\n", __FUNCTION__);
581 name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
583 if(!SPEC_OCLS( OP_SYM_ETYPE(op))) { // patch 13
584 if(pic16_debug_verbose) //
586 fprintf(stderr, "%s:%d symbol %s(r:%s) is not assigned to a memmap\n", __FILE__, __LINE__, //
587 OP_SYMBOL(op)->name, OP_SYMBOL(op)->rname); //
592 debugLog ("%s symbol name %s\n", __FUNCTION__,name);
593 // fprintf(stderr, "%s symbol name %s\n", __FUNCTION__,name);
596 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
597 debugLog(" %d const char\n",__LINE__);
598 debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
599 // fprintf(stderr, " %d const char\n",__LINE__);
600 // fprintf(stderr, " value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
604 debugLog(" %d storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
605 if (IS_CODE ( OP_SYM_ETYPE(op)) )
606 debugLog(" %d code space\n",__LINE__);
608 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
609 debugLog(" %d integral\n",__LINE__);
611 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
612 debugLog(" %d literal\n",__LINE__);
614 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
615 debugLog(" %d specifier\n",__LINE__);
617 debugAopGet(NULL, op);
620 if (IS_CODE ( OP_SYM_ETYPE(op)) )
623 /* First, search the hash table to see if there is a register with this name */
624 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && !(IS_BITVAR (OP_SYM_ETYPE(op))) ) {
626 // reg = regWithIdx (pic16_dynProcessorRegs, SPEC_ADDR ( OP_SYM_ETYPE(op)), 1);
630 fprintf(stderr,"%s:%d: ralloc %s is at fixed address but not a processor reg, addr=0x%x\n",
631 __FUNCTION__, __LINE__, name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
633 fprintf(stderr,"%s:%d: ralloc %s at fixed address has already been declared, addr=0x%x\n",
634 __FUNCTION__, __LINE__, name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
637 // fprintf(stderr,"ralloc:%d %s \n", __LINE__,name);
639 reg = pic16_dirregWithName(name);
644 int regtype = REG_GPR;
646 /* if this is at an absolute address, then get the address. */
647 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
648 address = SPEC_ADDR ( OP_SYM_ETYPE(op));
649 // fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
652 /* Register wasn't found in hash, so let's create
653 * a new one and put it in the hash table AND in the
654 * dynDirectRegNames set */
655 if(IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))) {
656 if(pic16_debug_verbose)
657 // fprintf(stderr, "%s:%d symbol %s in codespace\n", __FILE__, __LINE__,
658 // OP_SYMBOL(op)->name);
659 debugLog("%s:%d sym: %s in codespace\n", __FUNCTION__, __LINE__, OP_SYMBOL(op)->name);
663 if(!IS_CONFIG_ADDRESS(address)) {
664 // fprintf(stderr,"%s:allocating new reg %s\n",__FUNCTION__, name);
666 /* this is an error, why added? -- VR */
667 // if(SPEC_SCLS(OP_SYM_ETYPE(op)))regtype = REG_SFR;
669 if(OP_SYMBOL(op)->onStack) {
670 // fprintf(stderr, "%s:%d onStack %s\n", __FILE__, __LINE__, OP_SYMBOL(op)->name);
671 OP_SYMBOL(op)->onStack = 0;
672 SPEC_OCLS(OP_SYM_ETYPE(op)) = data;
676 if(!IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))) { // patch 13
677 if(pic16_debug_verbose) //
679 fprintf(stderr, "dispace:%d farspace:%d codespace:%d regspace:%d stack:%d\n",
680 IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
681 IN_FARSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
682 IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
683 IN_REGSP( SPEC_OCLS( OP_SYM_ETYPE(op))),
684 IN_STACK( OP_SYM_ETYPE(op)));
686 fprintf(stderr, "%s:%d symbol %s NOT in dirspace\n", __FILE__, __LINE__, //
687 OP_SYMBOL(op)->name); //
692 reg = newReg(regtype, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0, op);
693 debugLog ("%d -- added %s to hash, size = %d\n", __LINE__, name,reg->size);
695 // hTabAddItem(&dynDirectRegNames, regname2key(name), reg); /* commented out */
697 // if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
698 // fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
699 // reg->type = REG_SFR;
702 if (IS_BITVAR (OP_SYM_ETYPE(op))) {
703 // fprintf(stderr, "%s:%d adding %s in bit registers\n", __FILE__, __LINE__, reg->name);
704 addSet(&pic16_dynDirectBitRegs, reg);
707 // fprintf(stderr, "%s:%d adding %s in direct registers\n", __FILE__, __LINE__, reg->name);
708 // addSet(&pic16_dynDirectRegs, reg);
709 checkAddReg(&pic16_dynDirectRegs, reg);
713 debugLog (" -- %s is declared at address 0x30000x\n",name);
714 fprintf(stderr, " -- %s is declared at address 0x30000x\n",name);
720 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
722 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
724 /* work around for user defined registers in access bank */
725 if((reg->address>= 0x00 && reg->address < 0x80)
726 || (reg->address >= 0xf80 && reg->address <= 0xfff))
729 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
735 /*-----------------------------------------------------------------*/
736 /* pic16_allocRegByName - allocates register of given type */
737 /*-----------------------------------------------------------------*/
739 pic16_allocRegByName (char *name, int size)
745 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
749 /* First, search the hash table to see if there is a register with this name */
750 reg = pic16_dirregWithName(name);
754 /* Register wasn't found in hash, so let's create
755 * a new one and put it in the hash table AND in the
756 * dynDirectRegNames set */
757 //fprintf (stderr,"%s symbol name %s\n", __FUNCTION__,name);
758 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0, NULL);
760 debugLog ("%d -- added %s to hash, size = %d\n", __LINE__, name,reg->size);
761 //fprintf(stderr, " -- added %s to hash, size = %d\n", name,reg->size);
763 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg); /* initially commented out */
764 addSet(&pic16_dynDirectRegs, reg);
770 /*-----------------------------------------------------------------*/
771 /* RegWithIdx - returns pointer to register with index number */
772 /*-----------------------------------------------------------------*/
773 regs *pic16_typeRegWithIdx (int idx, int type, int fixed)
778 debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
779 // fprintf(stderr, "%s - requesting index = 0x%x\n", __FUNCTION__, idx);
784 if( (dReg = regWithIdx ( pic16_dynAllocRegs, idx, fixed)) != NULL) {
786 debugLog ("Found a Dynamic Register!\n");
789 if( (dReg = regWithIdx ( pic16_dynDirectRegs, idx, fixed)) != NULL ) {
790 debugLog ("Found a Direct Register!\n");
796 if( (dReg = regWithIdx ( pic16_dynStackRegs, idx, fixed)) != NULL ) {
797 debugLog ("Found a Stack Register!\n");
802 if( (dReg = regWithIdx ( pic16_dynProcessorRegs, idx, fixed)) != NULL ) {
803 debugLog ("Found a Processor Register!\n");
817 /*-----------------------------------------------------------------*/
818 /* pic16_regWithIdx - returns pointer to register with index number*/
819 /*-----------------------------------------------------------------*/
821 pic16_regWithIdx (int idx)
825 if( (dReg = pic16_typeRegWithIdx(idx,REG_GPR,0)) != NULL)
828 if( (dReg = pic16_typeRegWithIdx(idx,REG_SFR,0)) != NULL)
831 if( (dReg = pic16_typeRegWithIdx(idx,REG_STK,0)) != NULL)
837 /*-----------------------------------------------------------------*/
838 /* pic16_regWithIdx - returns pointer to register with index number */
839 /*-----------------------------------------------------------------*/
841 pic16_allocWithIdx (int idx)
846 debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
847 // fprintf(stderr, "%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
849 if( (dReg = regWithIdx ( pic16_dynAllocRegs, idx,0)) != NULL) {
851 debugLog ("Found a Dynamic Register!\n");
852 } else if( (dReg = regWithIdx ( pic16_dynStackRegs, idx,0)) != NULL ) {
853 debugLog ("Found a Stack Register!\n");
854 } else if( (dReg = regWithIdx ( pic16_dynProcessorRegs, idx,0)) != NULL ) {
855 debugLog ("Found a Processor Register!\n");
856 fprintf(stderr, "Found a processor register! %s\n", dReg->name);
857 } else if( (dReg = regWithIdx ( pic16_dynInternalRegs, idx,0)) != NULL ) {
858 debugLog ("Found an Internal Register!\n");
861 debugLog ("Dynamic Register not found\n");
864 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
865 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
866 "regWithIdx not found");
876 /*-----------------------------------------------------------------*/
877 /*-----------------------------------------------------------------*/
879 pic16_findFreeReg(short type)
886 if((dReg = regFindFree(pic16_dynAllocRegs)) != NULL)
888 return allocReg( REG_GPR ); //addSet(&pic16_dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0, NULL));
892 if((dReg = regFindFree(pic16_dynStackRegs)) != NULL)
904 /*-----------------------------------------------------------------*/
905 /* freeReg - frees a register */
906 /*-----------------------------------------------------------------*/
910 debugLog ("%s\n", __FUNCTION__);
911 // fprintf(stderr, "%s:%d register %s (%p) is freed\n", __FILE__, __LINE__, reg->name, reg);
916 /*-----------------------------------------------------------------*/
917 /* nFreeRegs - returns number of free registers */
918 /*-----------------------------------------------------------------*/
926 /* although I fixed the register allocation/freeing scheme
927 * the for loop below doesn't give valid results. I do not
928 * know why yet. -- VR 10-Jan-2003 */
933 /* dynamically allocate as many as we need and worry about
934 * fitting them into a PIC later */
936 debugLog ("%s\n", __FUNCTION__);
938 for(reg = setFirstItem(pic16_dynAllocRegs); reg; reg=setNextItem(pic16_dynAllocRegs))
939 if((reg->type == type) && reg->isFree)nfr++;
941 fprintf(stderr, "%s:%d # of free registers= %d\n", __FILE__, __LINE__, nfr);
945 /*-----------------------------------------------------------------*/
946 /* nfreeRegsType - free registers with type */
947 /*-----------------------------------------------------------------*/
949 nfreeRegsType (int type)
952 debugLog ("%s\n", __FUNCTION__);
955 if ((nfr = nFreeRegs (type)) == 0)
956 return nFreeRegs (REG_GPR);
959 return nFreeRegs (type);
962 static void writeSetUsedRegs(FILE *of, set *dRegs)
967 for (dReg = setFirstItem(dRegs) ; dReg ;
968 dReg = setNextItem(dRegs)) {
971 fprintf (of, "\t%s\n",dReg->name);
977 extern void pic16_groupRegistersInSection(set *regset);
979 extern void pic16_dump_equates(FILE *of, set *equs);
980 //extern void pic16_dump_map(void);
981 extern void pic16_dump_section(FILE *of, set *section, int fix);
982 extern void pic16_dump_int_registers(FILE *of, set *section);
983 extern void pic16_dump_idata(FILE *of, set *idataSymSet);
985 static void packBits(set *bregs)
990 regs *relocbitfield=NULL;
996 for (regset = bregs ; regset ;
997 regset = regset->next) {
1000 breg->isBitField = 1;
1001 //fprintf(stderr,"bit reg: %s\n",breg->name);
1004 //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
1006 bitfield = pic16_typeRegWithIdx (breg->address >> 3, -1 , 1);
1007 breg->rIdx = breg->address & 7;
1008 breg->address >>= 3;
1011 sprintf (buffer, "fbitfield%02x", breg->address);
1012 //fprintf(stderr,"new bit field\n");
1013 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0, NULL);
1014 bitfield->isBitField = 1;
1015 bitfield->isFixed = 1;
1016 bitfield->address = breg->address;
1017 addSet(&pic16_dynDirectRegs,bitfield);
1018 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
1020 //fprintf(stderr," which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
1023 breg->reg_alias = bitfield;
1027 if(!relocbitfield || bit_no >7) {
1030 sprintf (buffer, "bitfield%d", byte_no);
1031 //fprintf(stderr,"new relocatable bit field\n");
1032 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0, NULL);
1033 relocbitfield->isBitField = 1;
1034 addSet(&pic16_dynDirectRegs,relocbitfield);
1035 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1039 breg->reg_alias = relocbitfield;
1040 breg->address = rDirectIdx; /* byte_no; */
1041 breg->rIdx = bit_no++;
1050 static void bitEQUs(FILE *of, set *bregs)
1052 regs *breg,*bytereg;
1055 //fprintf(stderr," %s\n",__FUNCTION__);
1056 for (breg = setFirstItem(bregs) ; breg ;
1057 breg = setNextItem(bregs)) {
1059 //fprintf(stderr,"bit reg: %s\n",breg->name);
1061 bytereg = breg->reg_alias;
1063 fprintf (of, "%s\tEQU\t( (%s<<3)+%d)\n",
1066 breg->rIdx & 0x0007);
1069 fprintf(stderr, "bit field is not assigned to a register\n");
1070 fprintf (of, "%s\tEQU\t( (bitfield%d<<3)+%d)\n",
1081 static void aliasEQUs(FILE *of, set *fregs, int use_rIdx)
1086 for (reg = setFirstItem(fregs) ; reg ;
1087 reg = setNextItem(fregs)) {
1089 if(!reg->isEmitted && reg->wasUsed) {
1091 if (reg->type != REG_SFR) {
1092 fprintf (of, "%s\tEQU\t0x%03x\n",
1098 fprintf (of, "%s\tEQU\t0x%03x\n",
1107 void pic16_writeUsedRegs(FILE *of)
1109 packBits(pic16_dynDirectBitRegs);
1111 pic16_groupRegistersInSection(pic16_dynAllocRegs);
1112 pic16_groupRegistersInSection(pic16_dynInternalRegs);
1113 pic16_groupRegistersInSection(pic16_dynStackRegs);
1114 pic16_groupRegistersInSection(pic16_dynDirectRegs);
1115 pic16_groupRegistersInSection(pic16_dynDirectBitRegs);
1116 pic16_groupRegistersInSection(pic16_dynProcessorRegs);
1120 pic16_assignFixedRegisters(pic16_dynAllocRegs);
1121 pic16_assignFixedRegisters(pic16_dynStackRegs);
1122 pic16_assignFixedRegisters(pic16_dynDirectRegs);
1123 pic16_assignFixedRegisters(pic16_dynProcessorRegs);
1125 pic16_assignRelocatableRegisters(pic16_dynDirectBitRegs, 0);
1126 pic16_assignRelocatableRegisters(pic16_dynInternalRegs,0);
1127 pic16_assignRelocatableRegisters(pic16_dynAllocRegs,0);
1128 pic16_assignRelocatableRegisters(pic16_dynStackRegs,0);
1129 pic16_assignRelocatableRegisters(pic16_dynDirectRegs,0);
1132 // pic16_dump_map();
1133 // pic16_dump_cblock(of);
1136 pic16_dump_equates(of, pic16_equ_data);
1138 /* dump initialised data */
1139 pic16_dump_idata(of, idataSymSet);
1141 /* dump internal registers */
1142 pic16_dump_int_registers(of, pic16_int_regs);
1144 /* dump other variables */
1145 pic16_dump_section(of, pic16_rel_udata, 0);
1146 pic16_dump_section(of, pic16_fix_udata, 1);
1151 /*-----------------------------------------------------------------*/
1152 /* allDefsOutOfRange - all definitions are out of a range */
1153 /*-----------------------------------------------------------------*/
1155 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
1159 debugLog ("%s\n", __FUNCTION__);
1163 for (i = 0; i < defs->size; i++)
1167 if (bitVectBitValue (defs, i) &&
1168 (ic = hTabItemWithKey (iCodehTab, i)) &&
1169 (ic->seq >= fseq && ic->seq <= toseq))
1179 /*-----------------------------------------------------------------*/
1180 /* computeSpillable - given a point find the spillable live ranges */
1181 /*-----------------------------------------------------------------*/
1183 computeSpillable (iCode * ic)
1187 debugLog ("%s\n", __FUNCTION__);
1188 /* spillable live ranges are those that are live at this
1189 point . the following categories need to be subtracted
1191 a) - those that are already spilt
1192 b) - if being used by this one
1193 c) - defined by this one */
1195 spillable = bitVectCopy (ic->rlive);
1197 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1199 bitVectCplAnd (spillable, ic->uses); /* used in this one */
1200 bitVectUnSetBit (spillable, ic->defKey);
1201 spillable = bitVectIntersect (spillable, _G.regAssigned);
1206 /*-----------------------------------------------------------------*/
1207 /* noSpilLoc - return true if a variable has no spil location */
1208 /*-----------------------------------------------------------------*/
1210 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1212 debugLog ("%s\n", __FUNCTION__);
1213 return (sym->usl.spillLoc ? 0 : 1);
1216 /*-----------------------------------------------------------------*/
1217 /* hasSpilLoc - will return 1 if the symbol has spil location */
1218 /*-----------------------------------------------------------------*/
1220 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1222 debugLog ("%s\n", __FUNCTION__);
1223 return (sym->usl.spillLoc ? 1 : 0);
1226 /*-----------------------------------------------------------------*/
1227 /* directSpilLoc - will return 1 if the splilocation is in direct */
1228 /*-----------------------------------------------------------------*/
1230 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1232 debugLog ("%s\n", __FUNCTION__);
1233 if (sym->usl.spillLoc &&
1234 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1240 /*-----------------------------------------------------------------*/
1241 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1242 /* but is not used as a pointer */
1243 /*-----------------------------------------------------------------*/
1245 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1247 debugLog ("%s\n", __FUNCTION__);
1248 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1251 /*-----------------------------------------------------------------*/
1252 /* rematable - will return 1 if the remat flag is set */
1253 /*-----------------------------------------------------------------*/
1255 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1257 debugLog ("%s\n", __FUNCTION__);
1261 /*-----------------------------------------------------------------*/
1262 /* notUsedInRemaining - not used or defined in remain of the block */
1263 /*-----------------------------------------------------------------*/
1265 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1267 debugLog ("%s\n", __FUNCTION__);
1268 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1269 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1272 /*-----------------------------------------------------------------*/
1273 /* allLRs - return true for all */
1274 /*-----------------------------------------------------------------*/
1276 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1278 debugLog ("%s\n", __FUNCTION__);
1282 /*-----------------------------------------------------------------*/
1283 /* liveRangesWith - applies function to a given set of live range */
1284 /*-----------------------------------------------------------------*/
1286 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1287 eBBlock * ebp, iCode * ic)
1292 debugLog ("%s\n", __FUNCTION__);
1293 if (!lrs || !lrs->size)
1296 for (i = 1; i < lrs->size; i++)
1299 if (!bitVectBitValue (lrs, i))
1302 /* if we don't find it in the live range
1303 hash table we are in serious trouble */
1304 if (!(sym = hTabItemWithKey (liveRanges, i)))
1306 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1307 "liveRangesWith could not find liveRange");
1311 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1312 addSetHead (&rset, sym);
1319 /*-----------------------------------------------------------------*/
1320 /* leastUsedLR - given a set determines which is the least used */
1321 /*-----------------------------------------------------------------*/
1323 leastUsedLR (set * sset)
1325 symbol *sym = NULL, *lsym = NULL;
1327 debugLog ("%s\n", __FUNCTION__);
1328 sym = lsym = setFirstItem (sset);
1333 for (; lsym; lsym = setNextItem (sset))
1336 /* if usage is the same then prefer
1337 the spill the smaller of the two */
1338 if (lsym->used == sym->used)
1339 if (getSize (lsym->type) < getSize (sym->type))
1343 if (lsym->used < sym->used)
1348 setToNull ((void *) &sset);
1353 /*-----------------------------------------------------------------*/
1354 /* noOverLap - will iterate through the list looking for over lap */
1355 /*-----------------------------------------------------------------*/
1357 noOverLap (set * itmpStack, symbol * fsym)
1360 debugLog ("%s\n", __FUNCTION__);
1363 for (sym = setFirstItem (itmpStack); sym;
1364 sym = setNextItem (itmpStack))
1366 if (sym->liveTo > fsym->liveFrom)
1374 /*-----------------------------------------------------------------*/
1375 /* isFree - will return 1 if the a free spil location is found */
1376 /*-----------------------------------------------------------------*/
1381 V_ARG (symbol **, sloc);
1382 V_ARG (symbol *, fsym);
1384 debugLog ("%s\n", __FUNCTION__);
1385 /* if already found */
1389 /* if it is free && and the itmp assigned to
1390 this does not have any overlapping live ranges
1391 with the one currently being assigned and
1392 the size can be accomodated */
1394 noOverLap (sym->usl.itmpStack, fsym) &&
1395 getSize (sym->type) >= getSize (fsym->type))
1404 /*-----------------------------------------------------------------*/
1405 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
1406 /*-----------------------------------------------------------------*/
1408 spillLRWithPtrReg (symbol * forSym)
1414 debugLog ("%s\n", __FUNCTION__);
1415 if (!_G.regAssigned ||
1416 bitVectIsZero (_G.regAssigned))
1419 r0 = pic16_regWithIdx (R0_IDX);
1420 r1 = pic16_regWithIdx (R1_IDX);
1422 /* for all live ranges */
1423 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1424 lrsym = hTabNextItem (liveRanges, &k))
1428 /* if no registers assigned to it or
1430 /* if it does not overlap with this then
1431 not need to spill it */
1433 if (lrsym->isspilt || !lrsym->nRegs ||
1434 (lrsym->liveTo < forSym->liveFrom))
1437 /* go thru the registers : if it is either
1438 r0 or r1 then spil it */
1439 for (j = 0; j < lrsym->nRegs; j++)
1440 if (lrsym->regs[j] == r0 ||
1441 lrsym->regs[j] == r1)
1450 /*-----------------------------------------------------------------*/
1451 /* createStackSpil - create a location on the stack to spil */
1452 /*-----------------------------------------------------------------*/
1454 createStackSpil (symbol * sym)
1456 symbol *sloc = NULL;
1457 int useXstack, model, noOverlay;
1459 char slocBuffer[30];
1460 debugLog ("%s\n", __FUNCTION__);
1462 /* first go try and find a free one that is already
1463 existing on the stack */
1464 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1466 /* found a free one : just update & return */
1467 sym->usl.spillLoc = sloc;
1470 addSetHead (&sloc->usl.itmpStack, sym);
1474 /* could not then have to create one , this is the hard part
1475 we need to allocate this on the stack : this is really a
1476 hack!! but cannot think of anything better at this time */
1478 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1480 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1481 __FILE__, __LINE__);
1485 sloc = newiTemp (slocBuffer);
1487 /* set the type to the spilling symbol */
1488 sloc->type = copyLinkChain (sym->type);
1489 sloc->etype = getSpec (sloc->type);
1490 SPEC_SCLS (sloc->etype) = S_DATA;
1491 SPEC_EXTR (sloc->etype) = 0;
1492 SPEC_STAT (sloc->etype) = 0;
1494 /* we don't allow it to be allocated`
1495 onto the external stack since : so we
1496 temporarily turn it off ; we also
1497 turn off memory model to prevent
1498 the spil from going to the external storage
1499 and turn off overlaying
1502 useXstack = options.useXstack;
1503 model = options.model;
1504 noOverlay = options.noOverlay;
1505 options.noOverlay = 1;
1506 options.model = options.useXstack = 0;
1510 options.useXstack = useXstack;
1511 options.model = model;
1512 options.noOverlay = noOverlay;
1513 sloc->isref = 1; /* to prevent compiler warning */
1515 /* if it is on the stack then update the stack */
1516 if (IN_STACK (sloc->etype))
1518 currFunc->stack += getSize (sloc->type);
1519 _G.stackExtend += getSize (sloc->type);
1522 _G.dataExtend += getSize (sloc->type);
1524 /* add it to the _G.stackSpil set */
1525 addSetHead (&_G.stackSpil, sloc);
1526 sym->usl.spillLoc = sloc;
1529 /* add it to the set of itempStack set
1530 of the spill location */
1531 addSetHead (&sloc->usl.itmpStack, sym);
1535 /*-----------------------------------------------------------------*/
1536 /* isSpiltOnStack - returns true if the spil location is on stack */
1537 /*-----------------------------------------------------------------*/
1539 isSpiltOnStack (symbol * sym)
1543 debugLog ("%s\n", __FUNCTION__);
1550 /* if (sym->_G.stackSpil) */
1553 if (!sym->usl.spillLoc)
1556 etype = getSpec (sym->usl.spillLoc->type);
1557 if (IN_STACK (etype))
1563 /*-----------------------------------------------------------------*/
1564 /* spillThis - spils a specific operand */
1565 /*-----------------------------------------------------------------*/
1567 spillThis (symbol * sym)
1570 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1572 /* if this is rematerializable or has a spillLocation
1573 we are okay, else we need to create a spillLocation
1575 if (!(sym->remat || sym->usl.spillLoc))
1576 createStackSpil (sym);
1579 /* mark it has spilt & put it in the spilt set */
1581 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1583 bitVectUnSetBit (_G.regAssigned, sym->key);
1585 for (i = 0; i < sym->nRegs; i++)
1589 freeReg (sym->regs[i]);
1590 sym->regs[i] = NULL;
1593 /* if spilt on stack then free up r0 & r1
1594 if they could have been assigned to some
1596 if (!pic16_ptrRegReq && isSpiltOnStack (sym))
1599 spillLRWithPtrReg (sym);
1602 if (sym->usl.spillLoc && !sym->remat)
1603 sym->usl.spillLoc->allocreq = 1;
1607 /*-----------------------------------------------------------------*/
1608 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1609 /*-----------------------------------------------------------------*/
1611 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1613 bitVect *lrcs = NULL;
1617 debugLog ("%s\n", __FUNCTION__);
1618 /* get the spillable live ranges */
1619 lrcs = computeSpillable (ic);
1621 /* get all live ranges that are rematerizable */
1622 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1625 /* return the least used of these */
1626 return leastUsedLR (selectS);
1629 /* get live ranges with spillLocations in direct space */
1630 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1632 sym = leastUsedLR (selectS);
1633 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1634 sym->usl.spillLoc->rname :
1635 sym->usl.spillLoc->name));
1637 /* mark it as allocation required */
1638 sym->usl.spillLoc->allocreq = 1;
1642 /* if the symbol is local to the block then */
1643 if (forSym->liveTo < ebp->lSeq)
1646 /* check if there are any live ranges allocated
1647 to registers that are not used in this block */
1648 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1650 sym = leastUsedLR (selectS);
1651 /* if this is not rematerializable */
1660 /* check if there are any live ranges that not
1661 used in the remainder of the block */
1662 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1664 sym = leastUsedLR (selectS);
1667 sym->remainSpil = 1;
1674 /* find live ranges with spillocation && not used as pointers */
1675 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1678 sym = leastUsedLR (selectS);
1679 /* mark this as allocation required */
1680 sym->usl.spillLoc->allocreq = 1;
1684 /* find live ranges with spillocation */
1685 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1688 sym = leastUsedLR (selectS);
1689 sym->usl.spillLoc->allocreq = 1;
1693 /* couldn't find then we need to create a spil
1694 location on the stack , for which one? the least
1696 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1699 /* return a created spil location */
1700 sym = createStackSpil (leastUsedLR (selectS));
1701 sym->usl.spillLoc->allocreq = 1;
1705 /* this is an extreme situation we will spill
1706 this one : happens very rarely but it does happen */
1712 /*-----------------------------------------------------------------*/
1713 /* spilSomething - spil some variable & mark registers as free */
1714 /*-----------------------------------------------------------------*/
1716 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1721 debugLog ("%s\n", __FUNCTION__);
1722 /* get something we can spil */
1723 ssym = selectSpil (ic, ebp, forSym);
1725 /* mark it as spilt */
1727 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1729 /* mark it as not register assigned &
1730 take it away from the set */
1731 bitVectUnSetBit (_G.regAssigned, ssym->key);
1733 /* mark the registers as free */
1734 for (i = 0; i < ssym->nRegs; i++)
1736 freeReg (ssym->regs[i]);
1738 /* if spilt on stack then free up r0 & r1
1739 if they could have been assigned to as gprs */
1740 if (!pic16_ptrRegReq && isSpiltOnStack (ssym))
1743 spillLRWithPtrReg (ssym);
1746 /* if this was a block level spil then insert push & pop
1747 at the start & end of block respectively */
1748 if (ssym->blockSpil)
1750 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1751 /* add push to the start of the block */
1752 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1753 ebp->sch->next : ebp->sch));
1754 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1755 /* add pop to the end of the block */
1756 addiCodeToeBBlock (ebp, nic, NULL);
1759 /* if spilt because not used in the remainder of the
1760 block then add a push before this instruction and
1761 a pop at the end of the block */
1762 if (ssym->remainSpil)
1765 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1766 /* add push just before this instruction */
1767 addiCodeToeBBlock (ebp, nic, ic);
1769 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1770 /* add pop to the end of the block */
1771 addiCodeToeBBlock (ebp, nic, NULL);
1780 /*-----------------------------------------------------------------*/
1781 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1782 /*-----------------------------------------------------------------*/
1784 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1789 debugLog ("%s\n", __FUNCTION__);
1791 /* try for a ptr type */
1792 if ((reg = allocReg (REG_PTR)))
1795 /* try for gpr type */
1796 if ((reg = allocReg (REG_GPR)))
1799 /* we have to spil */
1800 if (!spilSomething (ic, ebp, sym))
1803 /* make sure partially assigned registers aren't reused */
1804 for (j=0; j<=sym->nRegs; j++)
1806 sym->regs[j]->isFree = 0;
1808 /* this looks like an infinite loop but
1809 in really selectSpil will abort */
1813 /*-----------------------------------------------------------------*/
1814 /* getRegGpr - will try for GPR if not spil */
1815 /*-----------------------------------------------------------------*/
1817 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1822 debugLog ("%s\n", __FUNCTION__);
1824 /* try for gpr type */
1825 if ((reg = allocReg (REG_GPR)))
1828 if (!pic16_ptrRegReq)
1829 if ((reg = allocReg (REG_PTR)))
1832 /* we have to spil */
1833 if (!spilSomething (ic, ebp, sym))
1836 /* make sure partially assigned registers aren't reused */
1837 for (j=0; j<=sym->nRegs; j++)
1839 sym->regs[j]->isFree = 0;
1841 /* this looks like an infinite loop but
1842 in really selectSpil will abort */
1846 /*-----------------------------------------------------------------*/
1847 /* symHasReg - symbol has a given register */
1848 /*-----------------------------------------------------------------*/
1850 symHasReg (symbol * sym, regs * reg)
1854 debugLog ("%s\n", __FUNCTION__);
1855 for (i = 0; i < sym->nRegs; i++)
1856 if (sym->regs[i] == reg)
1862 /*-----------------------------------------------------------------*/
1863 /* deassignLRs - check the live to and if they have registers & are */
1864 /* not spilt then free up the registers */
1865 /*-----------------------------------------------------------------*/
1867 deassignLRs (iCode * ic, eBBlock * ebp)
1873 debugLog ("%s\n", __FUNCTION__);
1874 for (sym = hTabFirstItem (liveRanges, &k); sym;
1875 sym = hTabNextItem (liveRanges, &k))
1878 symbol *psym = NULL;
1879 /* if it does not end here */
1880 if (sym->liveTo > ic->seq)
1883 /* if it was spilt on stack then we can
1884 mark the stack spil location as free */
1889 sym->usl.spillLoc->isFree = 1;
1895 if (!bitVectBitValue (_G.regAssigned, sym->key))
1898 /* special case check if this is an IFX &
1899 the privious one was a pop and the
1900 previous one was not spilt then keep track
1902 if (ic->op == IFX && ic->prev &&
1903 ic->prev->op == IPOP &&
1904 !ic->prev->parmPush &&
1905 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
1906 psym = OP_SYMBOL (IC_LEFT (ic->prev));
1912 bitVectUnSetBit (_G.regAssigned, sym->key);
1914 /* if the result of this one needs registers
1915 and does not have it then assign it right
1917 if (IC_RESULT (ic) &&
1918 !(SKIP_IC2 (ic) || /* not a special icode */
1919 ic->op == JUMPTABLE ||
1924 POINTER_SET (ic)) &&
1925 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
1926 result->liveTo > ic->seq && /* and will live beyond this */
1927 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
1928 result->regType == sym->regType && /* same register types */
1929 result->nRegs && /* which needs registers */
1930 !result->isspilt && /* and does not already have them */
1932 !bitVectBitValue (_G.regAssigned, result->key) &&
1933 /* the number of free regs + number of regs in this LR
1934 can accomodate the what result Needs */
1935 ((nfreeRegsType (result->regType) +
1936 sym->nRegs) >= result->nRegs)
1940 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
1942 result->regs[i] = sym->regs[i];
1944 result->regs[i] = getRegGpr (ic, ebp, result);
1946 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
1950 /* free the remaining */
1951 for (; i < sym->nRegs; i++)
1955 if (!symHasReg (psym, sym->regs[i]))
1956 freeReg (sym->regs[i]);
1959 freeReg (sym->regs[i]);
1966 /*-----------------------------------------------------------------*/
1967 /* reassignLR - reassign this to registers */
1968 /*-----------------------------------------------------------------*/
1970 reassignLR (operand * op)
1972 symbol *sym = OP_SYMBOL (op);
1975 debugLog ("%s\n", __FUNCTION__);
1976 /* not spilt any more */
1977 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
1978 bitVectUnSetBit (_G.spiltSet, sym->key);
1980 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1984 for (i = 0; i < sym->nRegs; i++)
1985 sym->regs[i]->isFree = 0;
1988 /*-----------------------------------------------------------------*/
1989 /* willCauseSpill - determines if allocating will cause a spill */
1990 /*-----------------------------------------------------------------*/
1992 willCauseSpill (int nr, int rt)
1994 debugLog ("%s\n", __FUNCTION__);
1995 /* first check if there are any avlb registers
1996 of te type required */
1999 /* special case for pointer type
2000 if pointer type not avlb then
2001 check for type gpr */
2002 if (nFreeRegs (rt) >= nr)
2004 if (nFreeRegs (REG_GPR) >= nr)
2009 if (pic16_ptrRegReq)
2011 if (nFreeRegs (rt) >= nr)
2016 if (nFreeRegs (REG_PTR) +
2017 nFreeRegs (REG_GPR) >= nr)
2022 debugLog (" ... yep it will (cause a spill)\n");
2023 /* it will cause a spil */
2027 /*-----------------------------------------------------------------*/
2028 /* positionRegs - the allocator can allocate same registers to res- */
2029 /* ult and operand, if this happens make sure they are in the same */
2030 /* position as the operand otherwise chaos results */
2031 /*-----------------------------------------------------------------*/
2033 positionRegs (symbol * result, symbol * opsym, int lineno)
2035 int count = min (result->nRegs, opsym->nRegs);
2036 int i, j = 0, shared = 0;
2038 debugLog ("%s\n", __FUNCTION__);
2039 /* if the result has been spilt then cannot share */
2044 /* first make sure that they actually share */
2045 for (i = 0; i < count; i++)
2047 for (j = 0; j < count; j++)
2049 if (result->regs[i] == opsym->regs[j] && i != j)
2059 regs *tmp = result->regs[i];
2060 result->regs[i] = result->regs[j];
2061 result->regs[j] = tmp;
2066 /*------------------------------------------------------------------*/
2067 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2068 /* it should either have registers or have beed spilled. Otherwise, */
2069 /* there was an uninitialized variable, so just spill this to get */
2070 /* the operand in a valid state. */
2071 /*------------------------------------------------------------------*/
2073 verifyRegsAssigned (operand *op, iCode * ic)
2078 if (!IS_ITEMP (op)) return;
2080 sym = OP_SYMBOL (op);
2081 if (sym->isspilt) return;
2082 if (!sym->nRegs) return;
2083 if (sym->regs[0]) return;
2085 werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2086 sym->prereqv ? sym->prereqv->name : sym->name);
2091 /*-----------------------------------------------------------------*/
2092 /* serialRegAssign - serially allocate registers to the variables */
2093 /*-----------------------------------------------------------------*/
2095 serialRegAssign (eBBlock ** ebbs, int count)
2099 debugLog ("%s\n", __FUNCTION__);
2100 /* for all blocks */
2101 for (i = 0; i < count; i++)
2106 if (ebbs[i]->noPath &&
2107 (ebbs[i]->entryLabel != entryLabel &&
2108 ebbs[i]->entryLabel != returnLabel))
2111 /* of all instructions do */
2112 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2115 debugLog (" op: %s\n", decodeOp (ic->op));
2117 /* if this is an ipop that means some live
2118 range will have to be assigned again */
2120 reassignLR (IC_LEFT (ic));
2122 /* if result is present && is a true symbol */
2123 if (IC_RESULT (ic) && ic->op != IFX &&
2124 IS_TRUE_SYMOP (IC_RESULT (ic)))
2125 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2127 /* take away registers from live
2128 ranges that end at this instruction */
2129 deassignLRs (ic, ebbs[i]);
2131 /* some don't need registers */
2132 if (SKIP_IC2 (ic) ||
2133 ic->op == JUMPTABLE ||
2137 (IC_RESULT (ic) && POINTER_SET (ic)))
2140 /* now we need to allocate registers
2141 only for the result */
2144 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2150 /* if it does not need or is spilt
2151 or is already assigned to registers
2152 or will not live beyond this instructions */
2155 bitVectBitValue (_G.regAssigned, sym->key) ||
2156 sym->liveTo <= ic->seq)
2159 /* if some liverange has been spilt at the block level
2160 and this one live beyond this block then spil this
2162 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2167 /* if trying to allocate this will cause
2168 a spill and there is nothing to spill
2169 or this one is rematerializable then
2171 willCS = willCauseSpill (sym->nRegs, sym->regType);
2172 spillable = computeSpillable (ic);
2174 (willCS && bitVectIsZero (spillable)))
2182 /* if it has a spillocation & is used less than
2183 all other live ranges then spill this */
2185 if (sym->usl.spillLoc) {
2186 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2187 allLRs, ebbs[i], ic));
2188 if (leastUsed && leastUsed->used > sym->used) {
2193 /* if none of the liveRanges have a spillLocation then better
2194 to spill this one than anything else already assigned to registers */
2195 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2196 /* if this is local to this block then we might find a block spil */
2197 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2205 if (ic->op == RECEIVE)
2206 debugLog ("When I get clever, I'll optimize the receive logic\n");
2208 /* if we need ptr regs for the right side
2210 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2211 <= (unsigned) PTRSIZE)
2216 /* else we assign registers to it */
2217 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2219 debugLog (" %d - \n", __LINE__);
2221 bitVectDebugOn(_G.regAssigned, debugF);
2223 for (j = 0; j < sym->nRegs; j++)
2225 if (sym->regType == REG_PTR)
2226 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2228 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2230 /* if the allocation falied which means
2231 this was spilt then break */
2235 debugLog (" %d - \n", __LINE__);
2237 /* if it shares registers with operands make sure
2238 that they are in the same position */
2239 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2240 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2241 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2242 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2243 /* do the same for the right operand */
2244 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2245 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2246 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2247 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2249 debugLog (" %d - \n", __LINE__);
2252 debugLog (" %d - \n", __LINE__);
2261 /* Check for and fix any problems with uninitialized operands */
2262 for (i = 0; i < count; i++)
2266 if (ebbs[i]->noPath &&
2267 (ebbs[i]->entryLabel != entryLabel &&
2268 ebbs[i]->entryLabel != returnLabel))
2271 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2278 verifyRegsAssigned (IC_COND (ic), ic);
2282 if (ic->op == JUMPTABLE)
2284 verifyRegsAssigned (IC_JTCOND (ic), ic);
2288 verifyRegsAssigned (IC_RESULT (ic), ic);
2289 verifyRegsAssigned (IC_LEFT (ic), ic);
2290 verifyRegsAssigned (IC_RIGHT (ic), ic);
2296 /*-----------------------------------------------------------------*/
2297 /* rUmaskForOp :- returns register mask for an operand */
2298 /*-----------------------------------------------------------------*/
2300 rUmaskForOp (operand * op)
2306 debugLog ("%s\n", __FUNCTION__);
2307 /* only temporaries are assigned registers */
2311 sym = OP_SYMBOL (op);
2313 /* if spilt or no registers assigned to it
2315 if (sym->isspilt || !sym->nRegs)
2318 rumask = newBitVect (pic16_nRegs);
2320 for (j = 0; j < sym->nRegs; j++)
2322 rumask = bitVectSetBit (rumask,
2323 sym->regs[j]->rIdx);
2329 /*-----------------------------------------------------------------*/
2330 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2331 /*-----------------------------------------------------------------*/
2333 regsUsedIniCode (iCode * ic)
2335 bitVect *rmask = newBitVect (pic16_nRegs);
2337 debugLog ("%s\n", __FUNCTION__);
2338 /* do the special cases first */
2341 rmask = bitVectUnion (rmask,
2342 rUmaskForOp (IC_COND (ic)));
2346 /* for the jumptable */
2347 if (ic->op == JUMPTABLE)
2349 rmask = bitVectUnion (rmask,
2350 rUmaskForOp (IC_JTCOND (ic)));
2355 /* of all other cases */
2357 rmask = bitVectUnion (rmask,
2358 rUmaskForOp (IC_LEFT (ic)));
2362 rmask = bitVectUnion (rmask,
2363 rUmaskForOp (IC_RIGHT (ic)));
2366 rmask = bitVectUnion (rmask,
2367 rUmaskForOp (IC_RESULT (ic)));
2373 /*-----------------------------------------------------------------*/
2374 /* createRegMask - for each instruction will determine the regsUsed */
2375 /*-----------------------------------------------------------------*/
2377 createRegMask (eBBlock ** ebbs, int count)
2381 debugLog ("%s\n", __FUNCTION__);
2382 /* for all blocks */
2383 for (i = 0; i < count; i++)
2387 if (ebbs[i]->noPath &&
2388 (ebbs[i]->entryLabel != entryLabel &&
2389 ebbs[i]->entryLabel != returnLabel))
2392 /* for all instructions */
2393 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2398 if (SKIP_IC2 (ic) || !ic->rlive)
2401 /* first mark the registers used in this
2403 ic->rUsed = regsUsedIniCode (ic);
2404 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2406 /* now create the register mask for those
2407 registers that are in use : this is a
2408 super set of ic->rUsed */
2409 ic->rMask = newBitVect (pic16_nRegs + 1);
2411 /* for all live Ranges alive at this point */
2412 for (j = 1; j < ic->rlive->size; j++)
2417 /* if not alive then continue */
2418 if (!bitVectBitValue (ic->rlive, j))
2421 /* find the live range we are interested in */
2422 if (!(sym = hTabItemWithKey (liveRanges, j)))
2424 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2425 "createRegMask cannot find live range");
2429 /* if no register assigned to it */
2430 if (!sym->nRegs || sym->isspilt)
2433 /* for all the registers allocated to it */
2434 for (k = 0; k < sym->nRegs; k++)
2437 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2443 /*-----------------------------------------------------------------*/
2444 /* rematStr - returns the rematerialized string for a remat var */
2445 /*-----------------------------------------------------------------*/
2447 rematStr (symbol * sym)
2450 iCode *ic = sym->rematiCode;
2451 symbol *psym = NULL;
2453 debugLog ("%s\n", __FUNCTION__);
2455 //printf ("%s\n", s);
2457 /* if plus or minus print the right hand side */
2459 if (ic->op == '+' || ic->op == '-') {
2461 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2463 sprintf (s, "(%s %c 0x%04x)",
2464 OP_SYMBOL (IC_LEFT (ric))->rname,
2466 (int) operandLitValue (IC_RIGHT (ic)));
2469 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2471 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2472 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2477 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2478 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2480 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2485 /*-----------------------------------------------------------------*/
2486 /* rematStr - returns the rematerialized string for a remat var */
2487 /*-----------------------------------------------------------------*/
2489 rematStr (symbol * sym)
2492 iCode *ic = sym->rematiCode;
2494 debugLog ("%s\n", __FUNCTION__);
2499 /* if plus or minus print the right hand side */
2501 if (ic->op == '+' || ic->op == '-') {
2502 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2505 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2509 if (ic->op == '+' || ic->op == '-')
2511 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2512 sprintf (s, "(%s %c 0x%04x)",
2513 OP_SYMBOL (IC_LEFT (ric))->rname,
2515 (int) operandLitValue (IC_RIGHT (ic)));
2518 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2520 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2524 /* we reached the end */
2525 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2529 printf ("%s\n", buffer);
2534 /*-----------------------------------------------------------------*/
2535 /* regTypeNum - computes the type & number of registers required */
2536 /*-----------------------------------------------------------------*/
2544 debugLog ("%s\n", __FUNCTION__);
2545 /* for each live range do */
2546 for (sym = hTabFirstItem (liveRanges, &k); sym;
2547 sym = hTabNextItem (liveRanges, &k)) {
2549 debugLog (" %d - %s\n", __LINE__, sym->rname);
2550 //fprintf(stderr," %d - %s\n", __LINE__, sym->rname);
2552 /* if used zero times then no registers needed */
2553 if ((sym->liveTo - sym->liveFrom) == 0)
2557 /* if the live range is a temporary */
2560 debugLog (" %d - itemp register\n", __LINE__);
2562 /* if the type is marked as a conditional */
2563 if (sym->regType == REG_CND)
2566 /* if used in return only then we don't
2568 if (sym->ruonly || sym->accuse) {
2569 if (IS_AGGREGATE (sym->type) || sym->isptr)
2570 sym->type = aggrToPtr (sym->type, FALSE);
2571 debugLog (" %d - no reg needed - used as a return\n", __LINE__);
2576 /* if the symbol has only one definition &
2577 that definition is a get_pointer and the
2578 pointer we are getting is rematerializable and
2581 if (bitVectnBitsOn (sym->defs) == 1 &&
2582 (ic = hTabItemWithKey (iCodehTab,
2583 bitVectFirstBit (sym->defs))) &&
2585 !IS_BITVAR (sym->etype) &&
2586 (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2588 if (ptrPseudoSymSafe (sym, ic)) {
2592 debugLog (" %d - \n", __LINE__);
2594 /* create a psuedo symbol & force a spil */
2595 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2596 psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2597 psym->type = sym->type;
2598 psym->etype = sym->etype;
2599 psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2600 strcpy (psym->rname, psym->name);
2602 sym->usl.spillLoc = psym;
2606 /* if in data space or idata space then try to
2607 allocate pointer register */
2611 /* if not then we require registers */
2612 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2613 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2614 getSize (sym->type));
2618 if(IS_PTR_CONST (sym->type)) {
2620 if(IS_CODEPTR (sym->type)) {
2622 // what IS this ???? (HJD)
2623 debugLog (" %d const pointer type requires %d registers, changing to 3\n",__LINE__,sym->nRegs); // patch 14
2624 sym->nRegs = 3; // patch 14
2627 if (sym->nRegs > 4) {
2628 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2629 printTypeChain (sym->type, stderr);
2630 fprintf (stderr, "\n");
2633 /* determine the type of register required */
2634 if (sym->nRegs == 1 &&
2635 IS_PTR (sym->type) &&
2637 sym->regType = REG_PTR;
2639 sym->regType = REG_GPR;
2642 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2646 /* for the first run we don't provide */
2647 /* registers for true symbols we will */
2648 /* see how things go */
2653 static DEFSETFUNC (markRegFree)
2655 ((regs *)item)->isFree = 1;
2660 DEFSETFUNC (pic16_deallocReg)
2662 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2663 ((regs *)item)->isFree = 1;
2664 ((regs *)item)->wasUsed = 0;
2668 /*-----------------------------------------------------------------*/
2669 /* freeAllRegs - mark all registers as free */
2670 /*-----------------------------------------------------------------*/
2672 pic16_freeAllRegs ()
2674 debugLog ("%s\n", __FUNCTION__);
2676 applyToSet(pic16_dynAllocRegs,markRegFree);
2677 applyToSet(pic16_dynStackRegs,markRegFree);
2680 /*-----------------------------------------------------------------*/
2681 /*-----------------------------------------------------------------*/
2683 pic16_deallocateAllRegs ()
2685 debugLog ("%s\n", __FUNCTION__);
2687 applyToSet(pic16_dynAllocRegs,pic16_deallocReg);
2691 /*-----------------------------------------------------------------*/
2692 /* deallocStackSpil - this will set the stack pointer back */
2693 /*-----------------------------------------------------------------*/
2695 DEFSETFUNC (deallocStackSpil)
2699 debugLog ("%s\n", __FUNCTION__);
2704 /*-----------------------------------------------------------------*/
2705 /* farSpacePackable - returns the packable icode for far variables */
2706 /*-----------------------------------------------------------------*/
2708 farSpacePackable (iCode * ic)
2712 debugLog ("%s\n", __FUNCTION__);
2713 /* go thru till we find a definition for the
2714 symbol on the right */
2715 for (dic = ic->prev; dic; dic = dic->prev)
2718 /* if the definition is a call then no */
2719 if ((dic->op == CALL || dic->op == PCALL) &&
2720 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2725 /* if shift by unknown amount then not */
2726 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2727 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2730 /* if pointer get and size > 1 */
2731 if (POINTER_GET (dic) &&
2732 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2735 if (POINTER_SET (dic) &&
2736 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2739 /* if any three is a true symbol in far space */
2740 if (IC_RESULT (dic) &&
2741 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2742 isOperandInFarSpace (IC_RESULT (dic)))
2745 if (IC_RIGHT (dic) &&
2746 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2747 isOperandInFarSpace (IC_RIGHT (dic)) &&
2748 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2751 if (IC_LEFT (dic) &&
2752 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2753 isOperandInFarSpace (IC_LEFT (dic)) &&
2754 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2757 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2759 if ((dic->op == LEFT_OP ||
2760 dic->op == RIGHT_OP ||
2762 IS_OP_LITERAL (IC_RIGHT (dic)))
2772 /*-----------------------------------------------------------------*/
2773 /* packRegsForAssign - register reduction for assignment */
2774 /*-----------------------------------------------------------------*/
2776 packRegsForAssign (iCode * ic, eBBlock * ebp)
2781 debugLog ("%d\t%s\n", __LINE__, __FUNCTION__);
2782 debugLog ("ic->op = %s\n", decodeOp( ic->op ) );
2783 debugAopGet (" result:", IC_RESULT (ic));
2784 debugAopGet (" left:", IC_LEFT (ic));
2785 debugAopGet (" right:", IC_RIGHT (ic));
2787 /* if this is at an absolute address, then get the address. */
2788 if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2789 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2790 debugLog (" %d - found config word declaration\n", __LINE__);
2791 if(IS_VALOP(IC_RIGHT(ic))) {
2792 debugLog (" setting config word to %x\n",
2793 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2794 fprintf(stderr, " setting config word to %x\n",
2795 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2796 pic16_assignConfigWordValue( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2797 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2801 debugLog(" %d\n", __LINE__);
2803 /* remove the assignment from the iCode chain. */
2805 remiCodeFromeBBlock (ebp, ic);
2806 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2807 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2813 debugLog(" %d - actuall processing\n", __LINE__ );
2815 if (!IS_ITEMP (IC_RESULT (ic))) {
2816 pic16_allocDirReg(IC_RESULT (ic));
2817 debugLog (" %d - result is not temp\n", __LINE__);
2821 if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2822 debugLog (" %d - left is not temp, allocating\n", __LINE__);
2823 pic16_allocDirReg(IC_LEFT (ic));
2827 /* See BUGLOG0001 - VR */
2829 if (!IS_ITEMP (IC_RIGHT (ic))) {
2830 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2831 pic16_allocDirReg(IC_RIGHT (ic));
2836 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2837 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2839 debugLog (" %d - not packing - right side fails \n", __LINE__);
2843 /* if the true symbol is defined in far space or on stack
2844 then we should not since this will increase register pressure */
2845 if (isOperandInFarSpace (IC_RESULT (ic)))
2847 if ((dic = farSpacePackable (ic)))
2854 /* find the definition of iTempNN scanning backwards if we find a
2855 a use of the true symbol before we find the definition then
2857 for (dic = ic->prev; dic; dic = dic->prev)
2860 /* if there is a function call and this is
2861 a parameter & not my parameter then don't pack it */
2862 if ((dic->op == CALL || dic->op == PCALL) &&
2863 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2864 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2866 debugLog (" %d - \n", __LINE__);
2875 debugLog("%d\tSearching for iTempNN\n", __LINE__);
2878 if(IS_TRUE_SYMOP( IC_RESULT(dic))) {
2879 debugLog("%d - dic result is a TRUE_SYMOP\n", __LINE__);
2880 debugAopGet(" result is ", IC_RESULT(dic));
2882 if(IS_TRUE_SYMOP( IC_LEFT(dic))) {
2883 debugLog("%d - dic left is a SYMOP\n", __LINE__);
2884 debugAopGet(" left is ", IC_LEFT(dic));
2886 if(IS_TRUE_SYMOP( IC_RIGHT(dic))) {
2887 debugLog("%d - dic right is a SYMOP\n", __LINE__);
2888 debugAopGet(" right is ", IC_RIGHT(dic));
2892 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2893 IS_OP_VOLATILE (IC_RESULT (dic)))
2895 debugLog (" %d - dic is VOLATILE \n", __LINE__);
2901 if (IS_TRUE_SYMOP( IC_RIGHT (dic)) &&
2902 IS_OP_VOLATILE (IC_RIGHT(dic)))
2904 debugLog (" %d - dic right is VOLATILE\n", __LINE__);
2911 if (IS_TRUE_SYMOP( IC_LEFT (dic)) &&
2912 IS_OP_VOLATILE (IC_LEFT(dic)))
2914 debugLog (" %d - dic left is VOLATILE\n", __LINE__);
2922 if( IS_SYMOP( IC_RESULT(dic)) &&
2923 IS_BITFIELD( OP_SYMBOL(IC_RESULT(dic))->etype ) ) {
2925 debugLog (" %d - result is bitfield\n", __LINE__);
2931 if (IS_SYMOP (IC_RESULT (dic)) &&
2932 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2934 /* A previous result was assigned to the same register - we'll our definition */
2935 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
2936 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
2937 if (POINTER_SET (dic))
2943 if (IS_SYMOP (IC_RIGHT (dic)) &&
2944 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
2945 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2947 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
2952 if (IS_SYMOP (IC_LEFT (dic)) &&
2953 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2954 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2956 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
2961 if (POINTER_SET (dic) &&
2962 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
2964 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
2972 return 0; /* did not find */
2975 /* This code is taken from the hc08 port. Do not know
2976 * if it fits for pic16, but I leave it here just in case */
2978 /* if assignment then check that right is not a bit */
2979 if (ASSIGNMENT (dic) && !POINTER_SET (dic)) {
2980 sym_link *etype = operandType (IC_RIGHT (dic));
2982 if (IS_BITFIELD (etype)) {
2983 /* if result is a bit too then it's ok */
2984 etype = operandType (IC_RESULT (dic));
2985 if (!IS_BITFIELD (etype)) {
2986 debugLog(" %d bitfields\n");
2993 /* if the result is on stack or iaccess then it must be
2994 the same atleast one of the operands */
2995 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
2996 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3000 /* clear the onStack flag, the port doesn't support it yet! FIXME */
3001 if(OP_SYMBOL(IC_RESULT(ic))->onStack)
3002 OP_SYMBOL(IC_RESULT(ic))->onStack = 0;
3006 /* the operation has only one symbol
3007 operator then we can pack */
3008 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3009 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3012 if (!((IC_LEFT (dic) &&
3013 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3015 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3019 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3020 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3021 /* found the definition */
3022 /* replace the result with the result of */
3023 /* this assignment and remove this assignment */
3024 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3025 IC_RESULT (dic) = IC_RESULT (ic);
3027 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3029 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3031 /* delete from liverange table also
3032 delete from all the points inbetween and the new
3034 for (sic = dic; sic != ic; sic = sic->next)
3036 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3037 if (IS_ITEMP (IC_RESULT (dic)))
3038 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3041 remiCodeFromeBBlock (ebp, ic);
3042 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3044 debugLog(" %d\n", __LINE__ );
3045 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3046 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3054 #define NO_packRegsForAccUse
3055 #define NO_packRegsForSupport
3056 #define NO_packRegsForOneuse
3057 #define NO_cast_peep
3062 #ifndef NO_packRegsForSupport
3063 /*-----------------------------------------------------------------*/
3064 /* findAssignToSym : scanning backwards looks for first assig found */
3065 /*-----------------------------------------------------------------*/
3067 findAssignToSym (operand * op, iCode * ic)
3071 debugLog ("%s\n", __FUNCTION__);
3072 for (dic = ic->prev; dic; dic = dic->prev)
3075 /* if definition by assignment */
3076 if (dic->op == '=' &&
3077 !POINTER_SET (dic) &&
3078 IC_RESULT (dic)->key == op->key
3079 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3083 /* we are interested only if defined in far space */
3084 /* or in stack space in case of + & - */
3086 /* if assigned to a non-symbol then return
3088 if (!IS_SYMOP (IC_RIGHT (dic)))
3091 /* if the symbol is in far space then
3093 if (isOperandInFarSpace (IC_RIGHT (dic)))
3096 /* for + & - operations make sure that
3097 if it is on the stack it is the same
3098 as one of the three operands */
3099 if ((ic->op == '+' || ic->op == '-') &&
3100 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3104 if(OP_SYMBOL(IC_RESULT(ic))->onStack)
3105 OP_SYMBOL(IC_RESULT(ic))->onStack = 0;
3108 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3109 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3110 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3118 /* if we find an usage then we cannot delete it */
3119 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3122 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3125 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3129 /* now make sure that the right side of dic
3130 is not defined between ic & dic */
3133 iCode *sic = dic->next;
3135 for (; sic != ic; sic = sic->next)
3136 if (IC_RESULT (sic) &&
3137 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3148 #ifndef NO_packRegsForSupport
3149 /*-----------------------------------------------------------------*/
3150 /* packRegsForSupport :- reduce some registers for support calls */
3151 /*-----------------------------------------------------------------*/
3153 packRegsForSupport (iCode * ic, eBBlock * ebp)
3157 debugLog ("%s\n", __FUNCTION__);
3158 /* for the left & right operand :- look to see if the
3159 left was assigned a true symbol in far space in that
3160 case replace them */
3161 if (IS_ITEMP (IC_LEFT (ic)) &&
3162 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3164 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3170 debugAopGet ("removing left:", IC_LEFT (ic));
3172 /* found it we need to remove it from the
3174 for (sic = dic; sic != ic; sic = sic->next)
3175 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3177 IC_LEFT (ic)->operand.symOperand =
3178 IC_RIGHT (dic)->operand.symOperand;
3179 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3180 remiCodeFromeBBlock (ebp, dic);
3181 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3182 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3186 /* do the same for the right operand */
3189 IS_ITEMP (IC_RIGHT (ic)) &&
3190 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3192 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3198 /* if this is a subtraction & the result
3199 is a true symbol in far space then don't pack */
3200 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3202 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3203 if (IN_FARSPACE (SPEC_OCLS (etype)))
3207 debugAopGet ("removing right:", IC_RIGHT (ic));
3209 /* found it we need to remove it from the
3211 for (sic = dic; sic != ic; sic = sic->next)
3212 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3214 IC_RIGHT (ic)->operand.symOperand =
3215 IC_RIGHT (dic)->operand.symOperand;
3216 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3218 remiCodeFromeBBlock (ebp, dic);
3219 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3220 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3229 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3231 #ifndef NO_packRegsForOneuse
3232 /*-----------------------------------------------------------------*/
3233 /* packRegsForOneuse : - will reduce some registers for single Use */
3234 /*-----------------------------------------------------------------*/
3236 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3241 debugLog ("%s\n", __FUNCTION__);
3242 /* if returning a literal then do nothing */
3246 /* only upto 2 bytes since we cannot predict
3247 the usage of b, & acc */
3248 if (getSize (operandType (op)) > (pic16_fReturnSizePic - 3) && /* was 2, changed to 3 -- VR */
3253 /* this routine will mark the a symbol as used in one
3254 instruction use only && if the definition is local
3255 (ie. within the basic block) && has only one definition &&
3256 that definition is either a return value from a
3257 function or does not contain any variables in
3259 uses = bitVectCopy (OP_USES (op));
3260 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3261 if (!bitVectIsZero (uses)) /* has other uses */
3264 /* if it has only one defintion */
3265 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3266 return NULL; /* has more than one definition */
3268 /* get that definition */
3270 hTabItemWithKey (iCodehTab,
3271 bitVectFirstBit (OP_DEFS (op)))))
3274 /* found the definition now check if it is local */
3275 if (dic->seq < ebp->fSeq ||
3276 dic->seq > ebp->lSeq)
3277 return NULL; /* non-local */
3279 /* now check if it is the return from
3281 if (dic->op == CALL || dic->op == PCALL)
3283 if (ic->op != SEND && ic->op != RETURN &&
3284 !POINTER_SET(ic) && !POINTER_GET(ic))
3286 OP_SYMBOL (op)->ruonly = 1;
3293 /* otherwise check that the definition does
3294 not contain any symbols in far space */
3295 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3296 isOperandInFarSpace (IC_RIGHT (dic)) ||
3297 IS_OP_RUONLY (IC_LEFT (ic)) ||
3298 IS_OP_RUONLY (IC_RIGHT (ic)))
3303 /* if pointer set then make sure the pointer
3305 if (POINTER_SET (dic) &&
3306 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3309 if (POINTER_GET (dic) &&
3310 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3315 /* also make sure the intervenening instructions
3316 don't have any thing in far space */
3317 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3320 /* if there is an intervening function call then no */
3321 if (dic->op == CALL || dic->op == PCALL)
3323 /* if pointer set then make sure the pointer
3325 if (POINTER_SET (dic) &&
3326 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3329 if (POINTER_GET (dic) &&
3330 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3333 /* if address of & the result is remat then okay */
3334 if (dic->op == ADDRESS_OF &&
3335 OP_SYMBOL (IC_RESULT (dic))->remat)
3338 /* if operand has size of three or more & this
3339 operation is a '*','/' or '%' then 'b' may
3341 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3342 getSize (operandType (op)) >= 3)
3345 /* if left or right or result is in far space */
3346 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3347 isOperandInFarSpace (IC_RIGHT (dic)) ||
3348 isOperandInFarSpace (IC_RESULT (dic)) ||
3349 IS_OP_RUONLY (IC_LEFT (dic)) ||
3350 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3351 IS_OP_RUONLY (IC_RESULT (dic)))
3357 OP_SYMBOL (op)->ruonly = 1;
3364 /*-----------------------------------------------------------------*/
3365 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3366 /*-----------------------------------------------------------------*/
3368 isBitwiseOptimizable (iCode * ic)
3370 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3371 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3373 debugLog ("%s\n", __FUNCTION__);
3374 /* bitwise operations are considered optimizable
3375 under the following conditions (Jean-Louis VERN)
3387 if (IS_LITERAL (rtype) ||
3388 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3395 #ifndef NO_packRegsForAccUse
3397 /*-----------------------------------------------------------------*/
3398 /* packRegsForAccUse - pack registers for acc use */
3399 /*-----------------------------------------------------------------*/
3401 packRegsForAccUse (iCode * ic)
3405 debugLog ("%s\n", __FUNCTION__);
3407 /* if this is an aggregate, e.g. a one byte char array */
3408 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3411 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3413 /* if + or - then it has to be one byte result */
3414 if ((ic->op == '+' || ic->op == '-')
3415 && getSize (operandType (IC_RESULT (ic))) > 1)
3418 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3419 /* if shift operation make sure right side is not a literal */
3420 if (ic->op == RIGHT_OP &&
3421 (isOperandLiteral (IC_RIGHT (ic)) ||
3422 getSize (operandType (IC_RESULT (ic))) > 1))
3425 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3426 if (ic->op == LEFT_OP &&
3427 (isOperandLiteral (IC_RIGHT (ic)) ||
3428 getSize (operandType (IC_RESULT (ic))) > 1))
3431 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3432 if (IS_BITWISE_OP (ic) &&
3433 getSize (operandType (IC_RESULT (ic))) > 1)
3437 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3438 /* has only one definition */
3439 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3442 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3443 /* has only one use */
3444 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3447 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3448 /* and the usage immediately follows this iCode */
3449 if (!(uic = hTabItemWithKey (iCodehTab,
3450 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3453 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3454 if (ic->next != uic)
3457 /* if it is a conditional branch then we definitely can */
3461 if (uic->op == JUMPTABLE)
3464 /* if the usage is not is an assignment
3465 or an arithmetic / bitwise / shift operation then not */
3466 if (POINTER_SET (uic) &&
3467 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3470 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3471 if (uic->op != '=' &&
3472 !IS_ARITHMETIC_OP (uic) &&
3473 !IS_BITWISE_OP (uic) &&
3474 uic->op != LEFT_OP &&
3475 uic->op != RIGHT_OP)
3478 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3479 /* if used in ^ operation then make sure right is not a
3481 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3484 /* if shift operation make sure right side is not a literal */
3485 if (uic->op == RIGHT_OP &&
3486 (isOperandLiteral (IC_RIGHT (uic)) ||
3487 getSize (operandType (IC_RESULT (uic))) > 1))
3490 if (uic->op == LEFT_OP &&
3491 (isOperandLiteral (IC_RIGHT (uic)) ||
3492 getSize (operandType (IC_RESULT (uic))) > 1))
3495 /* make sure that the result of this icode is not on the
3496 stack, since acc is used to compute stack offset */
3497 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3498 OP_SYMBOL (IC_RESULT (uic))->onStack)
3501 /* if either one of them in far space then we cannot */
3502 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3503 isOperandInFarSpace (IC_LEFT (uic))) ||
3504 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3505 isOperandInFarSpace (IC_RIGHT (uic))))
3508 /* if the usage has only one operand then we can */
3509 if (IC_LEFT (uic) == NULL ||
3510 IC_RIGHT (uic) == NULL)
3513 /* make sure this is on the left side if not
3514 a '+' since '+' is commutative */
3515 if (ic->op != '+' &&
3516 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3520 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3521 /* if one of them is a literal then we can */
3522 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3523 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3524 (getSize (operandType (IC_RESULT (uic))) <= 1))
3526 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3531 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3532 /* if the other one is not on stack then we can */
3533 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3534 (IS_ITEMP (IC_RIGHT (uic)) ||
3535 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3536 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3539 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3540 (IS_ITEMP (IC_LEFT (uic)) ||
3541 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3542 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3548 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3549 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3556 /*-----------------------------------------------------------------*/
3557 /* packForPush - hueristics to reduce iCode for pushing */
3558 /*-----------------------------------------------------------------*/
3560 packForReceive (iCode * ic, eBBlock * ebp)
3564 debugLog ("%s\n", __FUNCTION__);
3565 debugAopGet (" result:", IC_RESULT (ic));
3566 debugAopGet (" left:", IC_LEFT (ic));
3567 debugAopGet (" right:", IC_RIGHT (ic));
3572 for (dic = ic->next; dic; dic = dic->next)
3577 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3578 debugLog (" used on left\n");
3579 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3580 debugLog (" used on right\n");
3581 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3582 debugLog (" used on result\n");
3584 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3585 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3590 debugLog (" hey we can remove this unnecessary assign\n");
3592 /*-----------------------------------------------------------------*/
3593 /* packForPush - hueristics to reduce iCode for pushing */
3594 /*-----------------------------------------------------------------*/
3596 packForPush (iCode * ic, eBBlock * ebp)
3600 debugLog ("%s\n", __FUNCTION__);
3601 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3604 /* must have only definition & one usage */
3605 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3606 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3609 /* find the definition */
3610 if (!(dic = hTabItemWithKey (iCodehTab,
3611 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3614 if (dic->op != '=' || POINTER_SET (dic))
3617 /* we now we know that it has one & only one def & use
3618 and the that the definition is an assignment */
3619 IC_LEFT (ic) = IC_RIGHT (dic);
3621 remiCodeFromeBBlock (ebp, dic);
3622 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3623 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3626 static void printSymType(char * str, sym_link *sl)
3628 if(!pic16_ralloc_debug)return;
3630 debugLog (" %s Symbol type: ",str);
3631 printTypeChain( sl, debugF);
3635 /*-----------------------------------------------------------------*/
3636 /* some debug code to print the symbol S_TYPE. Note that
3637 * the function checkSClass in src/SDCCsymt.c dinks with
3638 * the S_TYPE in ways the PIC port doesn't fully like...*/
3639 /*-----------------------------------------------------------------*/
3640 static void isData(sym_link *sl)
3644 if(!pic16_ralloc_debug)return;
3651 for ( ; sl; sl=sl->next) {
3653 switch (SPEC_SCLS(sl)) {
3654 case S_DATA: fprintf (of, "data "); break;
3655 case S_XDATA: fprintf (of, "xdata "); break;
3656 case S_SFR: fprintf (of, "sfr "); break;
3657 case S_SBIT: fprintf (of, "sbit "); break;
3658 case S_CODE: fprintf (of, "code "); break;
3659 case S_IDATA: fprintf (of, "idata "); break;
3660 case S_PDATA: fprintf (of, "pdata "); break;
3661 case S_LITERAL: fprintf (of, "literal "); break;
3662 case S_STACK: fprintf (of, "stack "); break;
3663 case S_XSTACK: fprintf (of, "xstack "); break;
3664 case S_BIT: fprintf (of, "bit "); break;
3665 case S_EEPROM: fprintf (of, "eeprom "); break;
3674 /*--------------------------------------------------------------------*/
3675 /* pic16_packRegisters - does some transformations to reduce */
3676 /* register pressure */
3678 /*--------------------------------------------------------------------*/
3680 pic16_packRegisters (eBBlock * ebp)
3685 debugLog ("%s\n", __FUNCTION__);
3691 /* look for assignments of the form */
3692 /* iTempNN = TRueSym (someoperation) SomeOperand */
3694 /* TrueSym := iTempNN:1 */
3695 for (ic = ebp->sch; ic; ic = ic->next)
3697 // debugLog("%d\n", __LINE__);
3698 /* find assignment of the form TrueSym := iTempNN:1 */
3699 /* see BUGLOG0001 for workaround with the CAST - VR */
3700 // if ( (ic->op == '=' || ic->op == CAST) && !POINTER_SET (ic) ) // patch 11
3701 if ( (ic->op == '=') && !POINTER_SET (ic) ) // patch 11
3702 change += packRegsForAssign (ic, ebp);
3706 if (POINTER_SET (ic))
3707 debugLog ("pointer is set\n");
3708 debugAopGet (" result:", IC_RESULT (ic));
3709 debugAopGet (" left:", IC_LEFT (ic));
3710 debugAopGet (" right:", IC_RIGHT (ic));
3719 for (ic = ebp->sch; ic; ic = ic->next) {
3721 if(IS_SYMOP ( IC_LEFT(ic))) {
3722 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3724 debugAopGet ("x left:", IC_LEFT (ic));
3726 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3728 if(IS_CODEPTR(OP_SYMBOL(IC_LEFT(ic))->type))
3730 debugLog (" is a pointer\n");
3732 if(IS_PTR(OP_SYMBOL(IC_LEFT(ic))->type))
3733 debugLog (" is a ptr\n");
3735 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3736 debugLog (" is volatile\n");
3740 if(IS_OP_VOLATILE(IC_LEFT(ic))) {
3741 debugLog (" %d - left is not temp, allocating\n", __LINE__);
3742 pic16_allocDirReg(IC_LEFT (ic));
3745 printSymType("c ", OP_SYMBOL(IC_LEFT(ic))->type);
3748 if(IS_SYMOP ( IC_RIGHT(ic))) {
3749 debugAopGet (" right:", IC_RIGHT (ic));
3750 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3753 if(IS_SYMOP ( IC_RESULT(ic))) {
3754 debugAopGet (" result:", IC_RESULT (ic));
3755 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3758 if(IS_TRUE_SYMOP ( IC_RIGHT(ic))) {
3759 debugAopGet (" right:", IC_RIGHT (ic));
3760 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3761 // pic16_allocDirReg(IC_RIGHT(ic));
3764 if(IS_TRUE_SYMOP ( IC_RESULT(ic))) {
3765 debugAopGet (" result:", IC_RESULT (ic));
3766 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3767 // pic16_allocDirReg(IC_RESULT(ic));
3771 if (POINTER_SET (ic))
3772 debugLog (" %d - Pointer set\n", __LINE__);
3775 /* if this is an itemp & result of a address of a true sym
3776 then mark this as rematerialisable */
3777 if (ic->op == ADDRESS_OF &&
3778 IS_ITEMP (IC_RESULT (ic)) &&
3779 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3780 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3781 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3784 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3786 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3787 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3788 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3792 /* if straight assignment then carry remat flag if
3793 this is the only definition */
3794 if (ic->op == '=' &&
3795 !POINTER_SET (ic) &&
3796 IS_SYMOP (IC_RIGHT (ic)) &&
3797 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3798 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3800 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3802 OP_SYMBOL (IC_RESULT (ic))->remat =
3803 OP_SYMBOL (IC_RIGHT (ic))->remat;
3804 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3805 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3808 /* if this is a +/- operation with a rematerizable
3809 then mark this as rematerializable as well */
3810 if ((ic->op == '+' || ic->op == '-') &&
3811 (IS_SYMOP (IC_LEFT (ic)) &&
3812 IS_ITEMP (IC_RESULT (ic)) &&
3813 OP_SYMBOL (IC_LEFT (ic))->remat &&
3814 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3815 IS_OP_LITERAL (IC_RIGHT (ic))))
3817 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3819 operandLitValue (IC_RIGHT (ic));
3820 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3821 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3822 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3825 /* mark the pointer usages */
3826 if (POINTER_SET (ic))
3828 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3829 debugLog (" marking as a pointer (set) =>");
3830 debugAopGet (" result:", IC_RESULT (ic));
3832 if (POINTER_GET (ic))
3834 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3835 debugLog (" marking as a pointer (get) =>");
3836 debugAopGet (" left:", IC_LEFT (ic));
3839 //debugLog(" %d %s\n", __LINE__, __FUNCTION__);
3843 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3844 /* if we are using a symbol on the stack
3845 then we should say pic16_ptrRegReq */
3846 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3847 pic16_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3848 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3849 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3850 pic16_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3851 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3855 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3856 if (IS_SYMOP (IC_LEFT (ic)))
3857 pic16_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3858 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3859 if (IS_SYMOP (IC_RIGHT (ic)))
3860 pic16_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3861 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3862 if (IS_SYMOP (IC_RESULT (ic)))
3863 pic16_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3864 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3867 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic16_ptrRegReq);
3871 /* if the condition of an if instruction
3872 is defined in the previous instruction then
3873 mark the itemp as a conditional */
3874 if ((IS_CONDITIONAL (ic) ||
3875 ((ic->op == BITWISEAND ||
3878 isBitwiseOptimizable (ic))) &&
3879 ic->next && ic->next->op == IFX &&
3880 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3881 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3884 debugLog (" %d\n", __LINE__);
3885 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3889 debugLog(" %d\n", __LINE__);
3891 #ifndef NO_packRegsForSupport
3892 /* reduce for support function calls */
3893 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3894 packRegsForSupport (ic, ebp);
3897 /* if a parameter is passed, it's in W, so we may not
3898 need to place a copy in a register */
3899 if (ic->op == RECEIVE)
3900 packForReceive (ic, ebp);
3902 #ifndef NO_packRegsForOneuse
3903 /* some cases the redundant moves can
3904 can be eliminated for return statements */
3905 if ((ic->op == RETURN || ic->op == SEND) &&
3906 !isOperandInFarSpace (IC_LEFT (ic)) &&
3908 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3911 #ifndef NO_packRegsForOneuse
3912 /* if pointer set & left has a size more than
3913 one and right is not in far space */
3914 if (POINTER_SET (ic) &&
3915 !isOperandInFarSpace (IC_RIGHT (ic)) &&
3916 !OP_SYMBOL (IC_RESULT (ic))->remat &&
3917 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3918 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3920 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3923 #ifndef NO_packRegsForOneuse
3924 /* if pointer get */
3925 if (POINTER_GET (ic) &&
3926 !isOperandInFarSpace (IC_RESULT (ic)) &&
3927 !OP_SYMBOL (IC_LEFT (ic))->remat &&
3928 !IS_OP_RUONLY (IC_RESULT (ic)) &&
3929 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3931 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3932 debugLog("%d - return from packRegsForOneuse\n", __LINE__);
3935 #ifndef NO_cast_peep
3936 /* if this is cast for intergral promotion then
3937 check if only use of the definition of the
3938 operand being casted/ if yes then replace
3939 the result of that arithmetic operation with
3940 this result and get rid of the cast */
3941 if (ic->op == CAST) {
3943 sym_link *fromType = operandType (IC_RIGHT (ic));
3944 sym_link *toType = operandType (IC_LEFT (ic));
3946 debugLog (" %d - casting\n", __LINE__);
3948 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3949 getSize (fromType) != getSize (toType)) {
3952 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3955 if (IS_ARITHMETIC_OP (dic)) {
3956 debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3958 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3959 IC_RESULT (dic) = IC_RESULT (ic);
3960 remiCodeFromeBBlock (ebp, ic);
3961 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3962 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3963 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3967 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3971 /* if the type from and type to are the same
3972 then if this is the only use then packit */
3973 if (compareType (operandType (IC_RIGHT (ic)),
3974 operandType (IC_LEFT (ic))) == 1) {
3976 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3979 debugLog(" %d\n", __LINE__);
3981 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3982 IC_RESULT (dic) = IC_RESULT (ic);
3983 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3984 remiCodeFromeBBlock (ebp, ic);
3985 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3986 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3994 iTempNN := (some variable in farspace) V1
3999 if (ic->op == IPUSH)
4001 packForPush (ic, ebp);
4005 #ifndef NO_packRegsForAccUse
4006 /* pack registers for accumulator use, when the
4007 result of an arithmetic or bit wise operation
4008 has only one use, that use is immediately following
4009 the defintion and the using iCode has only one
4010 operand or has two operands but one is literal &
4011 the result of that operation is not on stack then
4012 we can leave the result of this operation in acc:b
4014 if ((IS_ARITHMETIC_OP (ic)
4016 || IS_BITWISE_OP (ic)
4018 || ic->op == LEFT_OP || ic->op == RIGHT_OP
4021 IS_ITEMP (IC_RESULT (ic)) &&
4022 getSize (operandType (IC_RESULT (ic))) <= 1)
4024 packRegsForAccUse (ic);
4031 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4035 if (!pic16_ralloc_debug || !debugF)
4038 for (i = 0; i < count; i++)
4040 fprintf (debugF, "\n----------------------------------------------------------------\n");
4041 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4042 ebbs[i]->entryLabel->name,
4045 ebbs[i]->isLastInLoop);
4046 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4051 fprintf (debugF, "visited %d : hasFcall = %d\n",
4055 fprintf (debugF, "\ndefines bitVector :");
4056 bitVectDebugOn (ebbs[i]->defSet, debugF);
4057 fprintf (debugF, "\nlocal defines bitVector :");
4058 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4059 fprintf (debugF, "\npointers Set bitvector :");
4060 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4061 fprintf (debugF, "\nin pointers Set bitvector :");
4062 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4063 fprintf (debugF, "\ninDefs Set bitvector :");
4064 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4065 fprintf (debugF, "\noutDefs Set bitvector :");
4066 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4067 fprintf (debugF, "\nusesDefs Set bitvector :");
4068 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4069 fprintf (debugF, "\n----------------------------------------------------------------\n");
4070 printiCChain (ebbs[i]->sch, debugF);
4073 /*-----------------------------------------------------------------*/
4074 /* pic16_assignRegisters - assigns registers to each live range as need */
4075 /*-----------------------------------------------------------------*/
4077 pic16_assignRegisters (eBBlock ** ebbs, int count)
4082 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4083 debugLog ("\nebbs before optimizing:\n");
4084 dumpEbbsToDebug (ebbs, count);
4086 setToNull ((void *) &_G.funcrUsed);
4087 pic16_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4090 /* change assignments this will remove some
4091 live ranges reducing some register pressure */
4092 for (i = 0; i < count; i++)
4093 pic16_packRegisters (ebbs[i]);
4100 debugLog("dir registers allocated so far:\n");
4101 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4104 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4105 // fprintf(stderr, " -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4106 reg = hTabNextItem(dynDirectRegNames, &hkey);
4111 /* liveranges probably changed by register packing
4112 so we compute them again */
4113 recomputeLiveRanges (ebbs, count);
4115 if (options.dump_pack)
4116 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4118 /* first determine for each live range the number of
4119 registers & the type of registers required for each */
4122 /* and serially allocate registers */
4123 serialRegAssign (ebbs, count);
4125 // debugLog ("ebbs after serialRegAssign:\n");
4126 // dumpEbbsToDebug (ebbs, count);
4129 //pic16_freeAllRegs();
4131 /* if stack was extended then tell the user */
4134 /* werror(W_TOOMANY_SPILS,"stack", */
4135 /* _G.stackExtend,currFunc->name,""); */
4141 /* werror(W_TOOMANY_SPILS,"data space", */
4142 /* _G.dataExtend,currFunc->name,""); */
4146 /* after that create the register mask
4147 for each of the instruction */
4148 createRegMask (ebbs, count);
4150 /* redo that offsets for stacked automatic variables */
4151 redoStackOffsets ();
4153 if (options.dump_rassgn)
4154 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4156 /* now get back the chain */
4157 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4159 debugLog ("ebbs after optimizing:\n");
4160 dumpEbbsToDebug (ebbs, count);
4165 /* free up any _G.stackSpil locations allocated */
4166 applyToSet (_G.stackSpil, deallocStackSpil);
4168 setToNull ((void *) &_G.stackSpil);
4169 setToNull ((void *) &_G.spiltSet);
4170 /* mark all registers as free */
4171 pic16_freeAllRegs ();
4173 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");