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
43 /*-----------------------------------------------------------------*/
44 /* At this point we start getting processor specific although */
45 /* some routines are non-processor specific & can be reused when */
46 /* targetting other processors. The decision for this will have */
47 /* to be made on a routine by routine basis */
48 /* routines used to pack registers are most definitely not reusable */
49 /* since the pack the registers depending strictly on the MCU */
50 /*-----------------------------------------------------------------*/
52 regs *pic16_typeRegWithIdx (int idx, int type, int fixed);
53 extern void genpic16Code (iCode *);
63 bitVect *funcrUsed; /* registers used in a function */
69 /* Shared with gen.c */
70 int pic16_ptrRegReq; /* one byte pointer register required */
73 set *pic16_dynAllocRegs=NULL;
74 set *pic16_dynStackRegs=NULL;
75 set *pic16_dynProcessorRegs=NULL;
76 set *pic16_dynDirectRegs=NULL;
77 set *pic16_dynDirectBitRegs=NULL;
78 set *pic16_dynInternalRegs=NULL;
79 set *pic16_dynAccessRegs=NULL;
81 static hTab *dynDirectRegNames=NULL;
82 static hTab *dynAllocRegNames=NULL;
83 static hTab *dynProcRegNames=NULL;
84 static hTab *dynAccessRegNames=NULL;
85 //static hTab *regHash = NULL; /* a hash table containing ALL registers */
87 extern set *sectNames;
89 set *pic16_rel_udata=NULL; /* relocatable uninitialized registers */
90 set *pic16_fix_udata=NULL; /* absolute uninitialized registers */
91 set *pic16_equ_data=NULL; /* registers used by equates */
92 set *pic16_int_regs=NULL; /* internal registers placed in access bank 0 to 0x7f */
93 set *pic16_acs_udata=NULL; /* access bank variables */
95 set *pic16_builtin_functions=NULL;
97 static int dynrIdx=0x00; //0x20; // starting temporary register rIdx
98 static int rDirectIdx=0;
100 int pic16_nRegs = 128; // = sizeof (regspic16) / sizeof (regs);
102 int pic16_Gstack_base_addr=0; /* The starting address of registers that
103 * are used to pass and return parameters */
108 static void spillThis (symbol *);
109 int pic16_ralloc_debug = 0;
110 static FILE *debugF = NULL;
111 /*-----------------------------------------------------------------*/
112 /* debugLog - open a file for debugging information */
113 /*-----------------------------------------------------------------*/
114 //static void debugLog(char *inst,char *fmt, ...)
116 debugLog (char *fmt,...)
118 static int append = 0; // First time through, open the file without append.
121 //char *bufferP=buffer;
124 if (!pic16_ralloc_debug || !dstFileName)
130 /* create the file name */
131 strcpy (buffer, dstFileName);
132 strcat (buffer, ".d");
134 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
136 werror (E_FILE_OPEN_ERR, buffer);
139 append = 1; // Next time debubLog is called, we'll append the debug info
145 vsprintf (buffer, fmt, ap);
147 fprintf (debugF, "%s", buffer);
149 while (isspace(*bufferP)) bufferP++;
151 if (bufferP && *bufferP)
152 lineCurr = (lineCurr ?
153 connectLine(lineCurr,newLineNode(lb)) :
154 (lineHead = newLineNode(lb)));
155 lineCurr->isInline = _G.inLine;
156 lineCurr->isDebug = _G.debugLine;
165 if(!pic16_ralloc_debug)return;
168 fputc ('\n', debugF);
170 /*-----------------------------------------------------------------*/
171 /* debugLogClose - closes the debug log file (if opened) */
172 /*-----------------------------------------------------------------*/
182 #define AOP(op) op->aop
185 debugAopGet (char *str, operand * op)
187 if(!pic16_ralloc_debug)return NULL;
192 printOperand (op, debugF);
199 decodeOp (unsigned int op)
201 if (op < 128 && op > ' ') {
202 buffer[0] = (op & 0xff);
208 case IDENTIFIER: return "IDENTIFIER";
209 case TYPE_NAME: return "TYPE_NAME";
210 case CONSTANT: return "CONSTANT";
211 case STRING_LITERAL: return "STRING_LITERAL";
212 case SIZEOF: return "SIZEOF";
213 case PTR_OP: return "PTR_OP";
214 case INC_OP: return "INC_OP";
215 case DEC_OP: return "DEC_OP";
216 case LEFT_OP: return "LEFT_OP";
217 case RIGHT_OP: return "RIGHT_OP";
218 case LE_OP: return "LE_OP";
219 case GE_OP: return "GE_OP";
220 case EQ_OP: return "EQ_OP";
221 case NE_OP: return "NE_OP";
222 case AND_OP: return "AND_OP";
223 case OR_OP: return "OR_OP";
224 case MUL_ASSIGN: return "MUL_ASSIGN";
225 case DIV_ASSIGN: return "DIV_ASSIGN";
226 case MOD_ASSIGN: return "MOD_ASSIGN";
227 case ADD_ASSIGN: return "ADD_ASSIGN";
228 case SUB_ASSIGN: return "SUB_ASSIGN";
229 case LEFT_ASSIGN: return "LEFT_ASSIGN";
230 case RIGHT_ASSIGN: return "RIGHT_ASSIGN";
231 case AND_ASSIGN: return "AND_ASSIGN";
232 case XOR_ASSIGN: return "XOR_ASSIGN";
233 case OR_ASSIGN: return "OR_ASSIGN";
234 case TYPEDEF: return "TYPEDEF";
235 case EXTERN: return "EXTERN";
236 case STATIC: return "STATIC";
237 case AUTO: return "AUTO";
238 case REGISTER: return "REGISTER";
239 case CODE: return "CODE";
240 case EEPROM: return "EEPROM";
241 case INTERRUPT: return "INTERRUPT";
242 case SFR: return "SFR";
243 case AT: return "AT";
244 case SBIT: return "SBIT";
245 case REENTRANT: return "REENTRANT";
246 case USING: return "USING";
247 case XDATA: return "XDATA";
248 case DATA: return "DATA";
249 case IDATA: return "IDATA";
250 case PDATA: return "PDATA";
251 case VAR_ARGS: return "VAR_ARGS";
252 case CRITICAL: return "CRITICAL";
253 case NONBANKED: return "NONBANKED";
254 case BANKED: return "BANKED";
255 case CHAR: return "CHAR";
256 case SHORT: return "SHORT";
257 case INT: return "INT";
258 case LONG: return "LONG";
259 case SIGNED: return "SIGNED";
260 case UNSIGNED: return "UNSIGNED";
261 case FLOAT: return "FLOAT";
262 case DOUBLE: return "DOUBLE";
263 case CONST: return "CONST";
264 case VOLATILE: return "VOLATILE";
265 case VOID: return "VOID";
266 case BIT: return "BIT";
267 case STRUCT: return "STRUCT";
268 case UNION: return "UNION";
269 case ENUM: return "ENUM";
270 case ELIPSIS: return "ELIPSIS";
271 case RANGE: return "RANGE";
272 case FAR: return "FAR";
273 case CASE: return "CASE";
274 case DEFAULT: return "DEFAULT";
275 case IF: return "IF";
276 case ELSE: return "ELSE";
277 case SWITCH: return "SWITCH";
278 case WHILE: return "WHILE";
279 case DO: return "DO";
280 case FOR: return "FOR";
281 case GOTO: return "GOTO";
282 case CONTINUE: return "CONTINUE";
283 case BREAK: return "BREAK";
284 case RETURN: return "RETURN";
285 case INLINEASM: return "INLINEASM";
286 case IFX: return "IFX";
287 case ADDRESS_OF: return "ADDRESS_OF";
288 case GET_VALUE_AT_ADDRESS: return "GET_VALUE_AT_ADDRESS";
289 case SPIL: return "SPIL";
290 case UNSPIL: return "UNSPIL";
291 case GETHBIT: return "GETHBIT";
292 case BITWISEAND: return "BITWISEAND";
293 case UNARYMINUS: return "UNARYMINUS";
294 case IPUSH: return "IPUSH";
295 case IPOP: return "IPOP";
296 case PCALL: return "PCALL";
297 case ENDFUNCTION: return "ENDFUNCTION";
298 case JUMPTABLE: return "JUMPTABLE";
299 case RRC: return "RRC";
300 case RLC: return "RLC";
301 case CAST: return "CAST";
302 case CALL: return "CALL";
303 case PARAM: return "PARAM ";
304 case NULLOP: return "NULLOP";
305 case BLOCK: return "BLOCK";
306 case LABEL: return "LABEL";
307 case RECEIVE: return "RECEIVE";
308 case SEND: return "SEND";
310 sprintf (buffer, "unkown op %d %c", op, op & 0xff);
314 /*-----------------------------------------------------------------*/
315 /*-----------------------------------------------------------------*/
317 debugLogRegType (short type)
319 if(!pic16_ralloc_debug)return NULL;
321 case REG_GPR: return "REG_GPR";
322 case REG_PTR: return "REG_PTR";
323 case REG_CND: return "REG_CND";
325 sprintf (buffer, "unknown reg type %d", type);
330 /*-----------------------------------------------------------------*/
331 /*-----------------------------------------------------------------*/
332 static int regname2key(char const *name)
341 key += (*name++) + 1;
345 return ( (key + (key >> 4) + (key>>8)) & 0x3f);
349 /*-----------------------------------------------------------------*/
350 /* newReg - allocate and init memory for a new register */
351 /*-----------------------------------------------------------------*/
352 regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias, operand *refop)
357 dReg = Safe_calloc(1,sizeof(regs));
359 dReg->pc_type = pc_type;
362 dReg->name = Safe_strdup(name);
364 sprintf(buffer,"r0x%02X", dReg->rIdx);
367 dReg->name = Safe_strdup(buffer);
375 if(type == REG_SFR) {
377 dReg->address = rIdx;
378 dReg->accessBank = 1;
382 dReg->accessBank = 0;
385 // fprintf(stderr,"newReg: %s, rIdx = 0x%02x\taccess= %d\tregop= %p\n",dReg->name,rIdx, dReg->accessBank, refop);
389 dReg->reg_alias = NULL;
390 dReg->reglives.usedpFlows = newSet();
391 dReg->reglives.assignedpFlows = newSet();
394 if(!(type == REG_SFR && alias == 0x80))
395 hTabAddItem(&dynDirectRegNames, regname2key(name), dReg);
400 /*-----------------------------------------------------------------*/
401 /* regWithIdx - Search through a set of registers that matches idx */
402 /*-----------------------------------------------------------------*/
404 regWithIdx (set *dRegs, int idx, int fixed)
408 for (dReg = setFirstItem(dRegs) ; dReg ;
409 dReg = setNextItem(dRegs)) {
411 if(idx == dReg->rIdx && (fixed == dReg->isFixed)) {
419 /*-----------------------------------------------------------------*/
420 /* regFindFree - Search for a free register in a set of registers */
421 /*-----------------------------------------------------------------*/
423 regFindFree (set *dRegs)
427 for (dReg = setFirstItem(dRegs) ; dReg ;
428 dReg = setNextItem(dRegs)) {
430 // fprintf(stderr, "%s:%d checking register %s (%p) [rIdx: 0x%02x] if free= %d\n",
431 // __FILE__, __LINE__, dReg->name, dReg, dReg->rIdx, dReg->isFree);
440 /*-----------------------------------------------------------------*/
441 /* pic16_initStack - allocate registers for a pseudo stack */
442 /*-----------------------------------------------------------------*/
443 void pic16_initStack(int base_address, int size)
448 pic16_Gstack_base_addr = base_address;
449 //fprintf(stderr,"initStack");
451 for(i = 0; i<size; i++)
452 addSet(&pic16_dynStackRegs,newReg(REG_STK, PO_GPR_TEMP,base_address++,NULL,1,0, NULL));
455 /*-----------------------------------------------------------------*
456 *-----------------------------------------------------------------*/
458 pic16_allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
460 regs *reg = newReg(REG_SFR, po_type, rIdx, name, 1, alias, NULL);
462 // fprintf(stderr,"%s: %s addr =0x%x\n",__FUNCTION__, name,rIdx);
464 reg->wasUsed = 0; // we do not know if they are going to be used at all
465 reg->accessBank = 1; // implicit add access Bank
467 hTabAddItem(&dynProcRegNames, regname2key(reg->name), reg);
469 return addSet(&pic16_dynProcessorRegs, reg);
472 /*-----------------------------------------------------------------*
473 *-----------------------------------------------------------------*/
476 pic16_allocInternalRegister(int rIdx, char * name, short po_type, int alias)
478 regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias, NULL);
480 // fprintf(stderr,"%s:%d: %s %s addr =0x%x\n",__FILE__, __LINE__, __FUNCTION__, name, rIdx);
484 return addSet(&pic16_dynInternalRegs,reg);
489 /*-----------------------------------------------------------------*/
490 /* allocReg - allocates register of given type */
491 /*-----------------------------------------------------------------*/
493 allocReg (short type)
498 if(dynrIdx > pic16_nRegs)
502 /* try to reuse some unused registers */
503 reg = regFindFree( pic16_dynAllocRegs );
506 // fprintf(stderr, "%s: found FREE register %s\n", __FILE__, reg->name);
510 reg = newReg(REG_GPR, PO_GPR_TEMP, dynrIdx++, NULL, 1, 0, NULL);
511 // addSet(&pic16_dynAllocRegs, reg);
514 addSet(&pic16_dynAllocRegs, reg);
515 hTabAddItem(&dynAllocRegNames, regname2key(reg->name), reg);
519 // debugLog ("%s of type %s for register rIdx: %d\n", __FUNCTION__, debugLogRegType (type), dynrIdx-1);
521 // fprintf(stderr,"%s:%d: %s\t%s addr= 0x%x\trIdx= 0x%02x isFree: %d\n",
522 // __FILE__, __LINE__, __FUNCTION__, reg->name, reg->address, reg->rIdx, reg->isFree);
525 reg->accessBank = 1; /* this is a temporary register alloc in accessBank */
526 reg->isLocal = 1; /* this is a local frame register */
531 // fprintf(stderr, "%s:%d adding %s into function %s regsUsed\n", __FUNCTION__, __LINE__, reg->name, currFunc->name);
532 currFunc->regsUsed = bitVectSetBit (currFunc->regsUsed, reg->rIdx);
535 return (reg); // addSet(&pic16_dynAllocRegs,reg);
540 /*-----------------------------------------------------------------*/
541 /* pic16_dirregWithName - search for register by name */
542 /*-----------------------------------------------------------------*/
544 pic16_dirregWithName (char *name)
552 /* hash the name to get a key */
554 hkey = regname2key(name);
556 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
558 reg = hTabFirstItemWK(dynDirectRegNames, hkey);
562 if(STRCASECMP(reg->name, name) == 0) {
563 // fprintf(stderr, "%s:%d: FOUND name = %s\thash = %d\n", __FUNCTION__, __LINE__, reg->name, hkey);
567 reg = hTabNextItemWK (dynDirectRegNames);
571 return NULL; // name wasn't found in the hash table
574 /*-----------------------------------------------------------------*/
575 /* pic16_allocregWithName - search for register by name */
576 /*-----------------------------------------------------------------*/
578 pic16_allocregWithName (char *name)
586 /* hash the name to get a key */
588 hkey = regname2key(name);
590 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
592 reg = hTabFirstItemWK(dynAllocRegNames, hkey);
596 if(STRCASECMP(reg->name, name) == 0) {
600 reg = hTabNextItemWK (dynAllocRegNames);
604 return NULL; // name wasn't found in the hash table
609 /*-----------------------------------------------------------------*/
610 /* pic16_procregWithName - search for register by name */
611 /*-----------------------------------------------------------------*/
613 pic16_procregWithName (char *name)
621 /* hash the name to get a key */
623 hkey = regname2key(name);
625 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
627 reg = hTabFirstItemWK(dynProcRegNames, hkey);
631 if(STRCASECMP(reg->name, name) == 0) {
635 reg = hTabNextItemWK (dynProcRegNames);
639 return NULL; // name wasn't found in the hash table
643 /*-----------------------------------------------------------------*/
644 /* pic16_accessregWithName - search for register by name */
645 /*-----------------------------------------------------------------*/
647 pic16_accessregWithName (char *name)
655 /* hash the name to get a key */
657 hkey = regname2key(name);
659 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
661 reg = hTabFirstItemWK(dynAccessRegNames, hkey);
665 if(STRCASECMP(reg->name, name) == 0) {
669 reg = hTabNextItemWK (dynAccessRegNames);
673 return NULL; // name wasn't found in the hash table
677 regs *pic16_regWithName(char *name)
681 reg = pic16_dirregWithName( name );
684 reg = pic16_procregWithName( name );
687 reg = pic16_allocregWithName( name );
690 reg = pic16_accessregWithName( name );
697 /*-----------------------------------------------------------------*/
698 /* pic16_allocDirReg - allocates register of given type */
699 /*-----------------------------------------------------------------*/
701 pic16_allocDirReg (operand *op )
707 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
708 // fprintf(stderr, "%s BAD, op is NULL\n", __FUNCTION__);
712 name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
715 if(!SPEC_OCLS( OP_SYM_ETYPE(op))) {
717 if(pic16_debug_verbose)
719 fprintf(stderr, "%s:%d symbol %s(r:%s) is not assigned to a memmap\n", __FILE__, __LINE__,
720 OP_SYMBOL(op)->name, OP_SYMBOL(op)->rname);
726 if(!IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))
727 || !IN_FARSPACE(SPEC_OCLS( OP_SYM_ETYPE(op))) ) {
730 if(pic16_debug_verbose) {
731 fprintf(stderr, "dispace:%d farspace:%d codespace:%d regspace:%d stack:%d eeprom: %d regparm: %d isparm: %d\n",
732 IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
733 IN_FARSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
734 IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
735 IN_REGSP( SPEC_OCLS( OP_SYM_ETYPE(op))),
736 IN_STACK( OP_SYM_ETYPE(op)),
737 SPEC_OCLS(OP_SYM_ETYPE(op)) == eeprom,
738 IS_REGPARM(OP_SYM_ETYPE(op)),
741 fprintf(stderr, "%s:%d symbol %s NOT in dirspace\n", __FILE__, __LINE__,
742 OP_SYMBOL(op)->name);
750 if (IS_CODE ( OP_SYM_ETYPE(op)) ) {
751 // fprintf(stderr, "%s:%d sym: %s in codespace\n", __FUNCTION__, __LINE__, OP_SYMBOL(op)->name);
756 debugLog ("%s:%d symbol name %s\n", __FUNCTION__, __LINE__, name);
757 // fprintf(stderr, "%s symbol name %s\n", __FUNCTION__,name);
760 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
761 debugLog(" %d const char\n",__LINE__);
762 debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
763 // fprintf(stderr, " %d const char\n",__LINE__);
764 // fprintf(stderr, " value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
768 debugLog(" %d storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
769 if (IS_CODE ( OP_SYM_ETYPE(op)) )
770 debugLog(" %d code space\n",__LINE__);
772 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
773 debugLog(" %d integral\n",__LINE__);
775 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
776 debugLog(" %d literal\n",__LINE__);
778 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
779 debugLog(" %d specifier\n",__LINE__);
781 debugAopGet(NULL, op);
785 reg = pic16_dirregWithName(name);
789 int regtype = REG_GPR;
791 /* if this is at an absolute address, then get the address. */
792 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
793 address = SPEC_ADDR ( OP_SYM_ETYPE(op));
794 // fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
797 /* Register wasn't found in hash, so let's create
798 * a new one and put it in the hash table AND in the
799 * dynDirectRegNames set */
800 if(IS_CODE(OP_SYM_ETYPE(op)) || IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))) {
801 debugLog("%s:%d sym: %s in codespace\n", __FUNCTION__, __LINE__, OP_SYMBOL(op)->name);
806 if(OP_SYMBOL(op)->onStack) {
807 fprintf(stderr, "%s:%d onStack %s offset: %d\n", __FILE__, __LINE__,
808 OP_SYMBOL(op)->name, OP_SYMBOL(op)->stack);
811 if(!IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))
812 || !IN_FARSPACE(SPEC_OCLS( OP_SYM_ETYPE(op))) ) {
815 if(pic16_debug_verbose)
817 fprintf(stderr, "dispace:%d farspace:%d codespace:%d regspace:%d stack:%d eeprom: %d\n",
818 IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
819 IN_FARSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
820 IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
821 IN_REGSP( SPEC_OCLS( OP_SYM_ETYPE(op))),
822 IN_STACK( OP_SYM_ETYPE(op)),
823 SPEC_OCLS(OP_SYM_ETYPE(op)) == eeprom);
825 fprintf(stderr, "%s:%d symbol %s NOT in dirspace\n", __FILE__, __LINE__,
826 OP_SYMBOL(op)->name);
831 reg = newReg(regtype, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0, op);
832 debugLog ("%d -- added %s to hash, size = %d\n", __LINE__, name,reg->size);
834 if( SPEC_SCLS( OP_SYM_ETYPE( op ) ) == S_REGISTER ) {
835 fprintf(stderr, "%s:%d symbol %s is declared as register\n", __FILE__, __LINE__,
839 checkAddReg(&pic16_dynAccessRegs, reg);
840 hTabAddItem(&dynAccessRegNames, regname2key(name), reg);
846 // if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
847 // fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
848 // reg->type = REG_SFR;
851 if (IS_BITVAR (OP_SYM_ETYPE(op))) {
852 // fprintf(stderr, "%s:%d adding %s in bit registers\n", __FILE__, __LINE__, reg->name);
853 addSet(&pic16_dynDirectBitRegs, reg);
856 // fprintf(stderr, "%s:%d adding %s in direct registers\n", __FILE__, __LINE__, reg->name);
857 // addSet(&pic16_dynDirectRegs, reg);
859 checkAddReg(&pic16_dynDirectRegs, reg);
863 // debugLog (" -- %s is declared at address 0x30000x\n",name);
864 return (reg); /* This was NULL before, but since we found it
865 * why not just return it?! */
868 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
870 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
872 /* work around for user defined registers in access bank */
873 if((reg->address>= 0x00 && reg->address < 0x80)
874 || (reg->address >= 0xf80 && reg->address <= 0xfff))
877 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
883 /*-----------------------------------------------------------------*/
884 /* pic16_allocRegByName - allocates register of given type */
885 /*-----------------------------------------------------------------*/
887 pic16_allocRegByName (char *name, int size, operand *op)
893 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
897 /* First, search the hash table to see if there is a register with this name */
898 reg = pic16_dirregWithName(name);
902 /* Register wasn't found in hash, so let's create
903 * a new one and put it in the hash table AND in the
904 * dynDirectRegNames set */
906 fprintf (stderr,"%s:%d symbol name %s\tregop= %p\n", __FUNCTION__, __LINE__, name, op);
908 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0, op);
910 debugLog ("%d -- added %s to hash, size = %d\n", __LINE__, name,reg->size);
911 //fprintf(stderr, " -- added %s to hash, size = %d\n", name,reg->size);
913 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg); /* initially commented out */
914 addSet(&pic16_dynDirectRegs, reg);
920 /*-----------------------------------------------------------------*/
921 /* RegWithIdx - returns pointer to register with index number */
922 /*-----------------------------------------------------------------*/
923 regs *pic16_typeRegWithIdx (int idx, int type, int fixed)
928 debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
929 // fprintf(stderr, "%s - requesting index = 0x%x\n", __FUNCTION__, idx);
934 if( (dReg = regWithIdx ( pic16_dynAllocRegs, idx, fixed)) != NULL) {
936 debugLog ("Found a Dynamic Register!\n");
939 if( (dReg = regWithIdx ( pic16_dynDirectRegs, idx, fixed)) != NULL ) {
940 debugLog ("Found a Direct Register!\n");
946 if( (dReg = regWithIdx ( pic16_dynStackRegs, idx, fixed)) != NULL ) {
947 debugLog ("Found a Stack Register!\n");
952 if( (dReg = regWithIdx ( pic16_dynProcessorRegs, idx, 1)) != NULL ) {
953 debugLog ("Found a Processor Register!\n");
967 /*-----------------------------------------------------------------*/
968 /* pic16_regWithIdx - returns pointer to register with index number*/
969 /*-----------------------------------------------------------------*/
971 pic16_regWithIdx (int idx)
975 if( (dReg = pic16_typeRegWithIdx(idx,REG_GPR,0)) != NULL)
978 if( (dReg = pic16_typeRegWithIdx(idx,REG_SFR,0)) != NULL)
982 if( (dReg = pic16_typeRegWithIdx(idx,REG_STK,0)) != NULL)
989 /*-----------------------------------------------------------------*/
990 /* pic16_regWithIdx - returns pointer to register with index number */
991 /*-----------------------------------------------------------------*/
993 pic16_allocWithIdx (int idx)
998 debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
999 // fprintf(stderr, "%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
1001 if( (dReg = regWithIdx ( pic16_dynAllocRegs, idx,0)) != NULL) {
1003 debugLog ("Found a Dynamic Register!\n");
1004 } else if( (dReg = regWithIdx ( pic16_dynStackRegs, idx,0)) != NULL ) {
1005 debugLog ("Found a Stack Register!\n");
1006 } else if( (dReg = regWithIdx ( pic16_dynProcessorRegs, idx,1)) != NULL ) {
1007 debugLog ("Found a Processor Register!\n");
1008 fprintf(stderr, "Found a processor register! %s\n", dReg->name);
1009 } else if( (dReg = regWithIdx ( pic16_dynInternalRegs, idx,0)) != NULL ) {
1010 debugLog ("Found an Internal Register!\n");
1013 debugLog ("Dynamic Register not found\n");
1016 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
1017 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1018 "regWithIdx not found");
1028 /*-----------------------------------------------------------------*/
1029 /*-----------------------------------------------------------------*/
1031 pic16_findFreeReg(short type)
1038 if((dReg = regFindFree(pic16_dynAllocRegs)) != NULL)
1040 return allocReg( REG_GPR ); //addSet(&pic16_dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0, NULL));
1044 if((dReg = regFindFree(pic16_dynStackRegs)) != NULL)
1056 /*-----------------------------------------------------------------*/
1057 /* freeReg - frees a register */
1058 /*-----------------------------------------------------------------*/
1060 freeReg (regs * reg)
1062 debugLog ("%s\n", __FUNCTION__);
1063 // fprintf(stderr, "%s:%d register %s (%p) is freed\n", __FILE__, __LINE__, reg->name, reg);
1068 /*-----------------------------------------------------------------*/
1069 /* nFreeRegs - returns number of free registers */
1070 /*-----------------------------------------------------------------*/
1072 nFreeRegs (int type)
1078 /* although I fixed the register allocation/freeing scheme
1079 * the for loop below doesn't give valid results. I do not
1080 * know why yet. -- VR 10-Jan-2003 */
1085 /* dynamically allocate as many as we need and worry about
1086 * fitting them into a PIC later */
1088 debugLog ("%s\n", __FUNCTION__);
1090 for(reg = setFirstItem(pic16_dynAllocRegs); reg; reg=setNextItem(pic16_dynAllocRegs))
1091 if((reg->type == type) && reg->isFree)nfr++;
1093 fprintf(stderr, "%s:%d # of free registers= %d\n", __FILE__, __LINE__, nfr);
1097 /*-----------------------------------------------------------------*/
1098 /* nfreeRegsType - free registers with type */
1099 /*-----------------------------------------------------------------*/
1101 nfreeRegsType (int type)
1104 debugLog ("%s\n", __FUNCTION__);
1105 if (type == REG_PTR)
1107 if ((nfr = nFreeRegs (type)) == 0)
1108 return nFreeRegs (REG_GPR);
1111 return nFreeRegs (type);
1114 static void writeSetUsedRegs(FILE *of, set *dRegs)
1119 for (dReg = setFirstItem(dRegs) ; dReg ;
1120 dReg = setNextItem(dRegs)) {
1123 fprintf (of, "\t%s\n",dReg->name);
1129 extern void pic16_groupRegistersInSection(set *regset);
1131 extern void pic16_dump_equates(FILE *of, set *equs);
1132 extern void pic16_dump_access(FILE *of, set *section);
1133 //extern void pic16_dump_map(void);
1134 extern void pic16_dump_usection(FILE *of, set *section, int fix);
1135 extern void pic16_dump_isection(FILE *of, set *section, int fix);
1136 extern void pic16_dump_int_registers(FILE *of, set *section);
1137 extern void pic16_dump_idata(FILE *of, set *idataSymSet);
1139 extern void pic16_dump_gsection(FILE *of, set *sections);
1141 static void packBits(set *bregs)
1145 regs *bitfield=NULL;
1146 regs *relocbitfield=NULL;
1152 for (regset = bregs ; regset ;
1153 regset = regset->next) {
1155 breg = regset->item;
1156 breg->isBitField = 1;
1157 //fprintf(stderr,"bit reg: %s\n",breg->name);
1160 //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
1162 bitfield = pic16_typeRegWithIdx (breg->address >> 3, -1 , 1);
1163 breg->rIdx = breg->address & 7;
1164 breg->address >>= 3;
1167 sprintf (buffer, "fbitfield%02x", breg->address);
1168 //fprintf(stderr,"new bit field\n");
1169 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0, NULL);
1170 bitfield->isBitField = 1;
1171 bitfield->isFixed = 1;
1172 bitfield->address = breg->address;
1173 addSet(&pic16_dynDirectRegs,bitfield);
1174 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
1176 //fprintf(stderr," which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
1179 breg->reg_alias = bitfield;
1183 if(!relocbitfield || bit_no >7) {
1186 sprintf (buffer, "bitfield%d", byte_no);
1187 //fprintf(stderr,"new relocatable bit field\n");
1188 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0, NULL);
1189 relocbitfield->isBitField = 1;
1190 addSet(&pic16_dynDirectRegs,relocbitfield);
1191 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1195 breg->reg_alias = relocbitfield;
1196 breg->address = rDirectIdx; /* byte_no; */
1197 breg->rIdx = bit_no++;
1203 void pic16_writeUsedRegs(FILE *of)
1205 packBits(pic16_dynDirectBitRegs);
1207 // fprintf(stderr, "%s: pic16_dynAllocRegs\n", __FUNCTION__);
1208 pic16_groupRegistersInSection(pic16_dynAllocRegs);
1210 // fprintf(stderr, "%s: pic16_dynInternalRegs\n", __FUNCTION__);
1211 pic16_groupRegistersInSection(pic16_dynInternalRegs);
1213 // fprintf(stderr, "%s: pic16_dynStackRegs\n", __FUNCTION__);
1214 pic16_groupRegistersInSection(pic16_dynStackRegs);
1216 // fprintf(stderr, "%s: pic16_dynDirectRegs\n", __FUNCTION__);
1217 pic16_groupRegistersInSection(pic16_dynDirectRegs);
1219 // fprintf(stderr, "%s: pic16_dynDirectBitsRegs\n", __FUNCTION__);
1220 pic16_groupRegistersInSection(pic16_dynDirectBitRegs);
1222 // fprintf(stderr, "%s: pic16_dynProcessorRegs\n", __FUNCTION__);
1223 pic16_groupRegistersInSection(pic16_dynProcessorRegs);
1225 // fprintf(stderr, "%s: pic16_dynAccessRegs\n", __FUNCTION__);
1226 pic16_groupRegistersInSection(pic16_dynAccessRegs);
1229 pic16_dump_equates(of, pic16_equ_data);
1231 // pic16_dump_esection(of, pic16_rel_eedata, 0);
1232 // pic16_dump_esection(of, pic16_fix_eedata, 0);
1234 /* dump access bank symbols */
1235 pic16_dump_access(of, pic16_acs_udata);
1237 /* dump initialised data */
1238 pic16_dump_isection(of, rel_idataSymSet, 0);
1239 pic16_dump_isection(of, fix_idataSymSet, 1);
1241 /* dump internal registers */
1242 pic16_dump_int_registers(of, pic16_int_regs);
1244 /* dump generic section variables */
1245 pic16_dump_gsection(of, sectNames);
1247 /* dump other variables */
1248 pic16_dump_usection(of, pic16_rel_udata, 0);
1249 pic16_dump_usection(of, pic16_fix_udata, 1);
1254 /*-----------------------------------------------------------------*/
1255 /* computeSpillable - given a point find the spillable live ranges */
1256 /*-----------------------------------------------------------------*/
1258 computeSpillable (iCode * ic)
1262 debugLog ("%s\n", __FUNCTION__);
1263 /* spillable live ranges are those that are live at this
1264 point . the following categories need to be subtracted
1266 a) - those that are already spilt
1267 b) - if being used by this one
1268 c) - defined by this one */
1270 spillable = bitVectCopy (ic->rlive);
1272 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1274 bitVectCplAnd (spillable, ic->uses); /* used in this one */
1275 bitVectUnSetBit (spillable, ic->defKey);
1276 spillable = bitVectIntersect (spillable, _G.regAssigned);
1281 /*-----------------------------------------------------------------*/
1282 /* noSpilLoc - return true if a variable has no spil location */
1283 /*-----------------------------------------------------------------*/
1285 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1287 debugLog ("%s\n", __FUNCTION__);
1288 return (sym->usl.spillLoc ? 0 : 1);
1291 /*-----------------------------------------------------------------*/
1292 /* hasSpilLoc - will return 1 if the symbol has spil location */
1293 /*-----------------------------------------------------------------*/
1295 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1297 debugLog ("%s\n", __FUNCTION__);
1298 return (sym->usl.spillLoc ? 1 : 0);
1301 /*-----------------------------------------------------------------*/
1302 /* directSpilLoc - will return 1 if the splilocation is in direct */
1303 /*-----------------------------------------------------------------*/
1305 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1307 debugLog ("%s\n", __FUNCTION__);
1308 if (sym->usl.spillLoc &&
1309 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1315 /*-----------------------------------------------------------------*/
1316 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1317 /* but is not used as a pointer */
1318 /*-----------------------------------------------------------------*/
1320 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1322 debugLog ("%s\n", __FUNCTION__);
1323 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1326 /*-----------------------------------------------------------------*/
1327 /* rematable - will return 1 if the remat flag is set */
1328 /*-----------------------------------------------------------------*/
1330 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1332 debugLog ("%s\n", __FUNCTION__);
1336 /*-----------------------------------------------------------------*/
1337 /* notUsedInRemaining - not used or defined in remain of the block */
1338 /*-----------------------------------------------------------------*/
1340 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1342 debugLog ("%s\n", __FUNCTION__);
1343 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1344 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1347 /*-----------------------------------------------------------------*/
1348 /* allLRs - return true for all */
1349 /*-----------------------------------------------------------------*/
1351 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1353 debugLog ("%s\n", __FUNCTION__);
1357 /*-----------------------------------------------------------------*/
1358 /* liveRangesWith - applies function to a given set of live range */
1359 /*-----------------------------------------------------------------*/
1361 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1362 eBBlock * ebp, iCode * ic)
1367 debugLog ("%s\n", __FUNCTION__);
1368 if (!lrs || !lrs->size)
1371 for (i = 1; i < lrs->size; i++)
1374 if (!bitVectBitValue (lrs, i))
1377 /* if we don't find it in the live range
1378 hash table we are in serious trouble */
1379 if (!(sym = hTabItemWithKey (liveRanges, i)))
1381 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1382 "liveRangesWith could not find liveRange");
1386 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1387 addSetHead (&rset, sym);
1394 /*-----------------------------------------------------------------*/
1395 /* leastUsedLR - given a set determines which is the least used */
1396 /*-----------------------------------------------------------------*/
1398 leastUsedLR (set * sset)
1400 symbol *sym = NULL, *lsym = NULL;
1402 debugLog ("%s\n", __FUNCTION__);
1403 sym = lsym = setFirstItem (sset);
1408 for (; lsym; lsym = setNextItem (sset))
1411 /* if usage is the same then prefer
1412 the spill the smaller of the two */
1413 if (lsym->used == sym->used)
1414 if (getSize (lsym->type) < getSize (sym->type))
1418 if (lsym->used < sym->used)
1423 setToNull ((void *) &sset);
1428 /*-----------------------------------------------------------------*/
1429 /* noOverLap - will iterate through the list looking for over lap */
1430 /*-----------------------------------------------------------------*/
1432 noOverLap (set * itmpStack, symbol * fsym)
1435 debugLog ("%s\n", __FUNCTION__);
1438 for (sym = setFirstItem (itmpStack); sym;
1439 sym = setNextItem (itmpStack))
1441 if (sym->liveTo > fsym->liveFrom)
1449 /*-----------------------------------------------------------------*/
1450 /* isFree - will return 1 if the a free spil location is found */
1451 /*-----------------------------------------------------------------*/
1456 V_ARG (symbol **, sloc);
1457 V_ARG (symbol *, fsym);
1459 debugLog ("%s\n", __FUNCTION__);
1460 /* if already found */
1464 /* if it is free && and the itmp assigned to
1465 this does not have any overlapping live ranges
1466 with the one currently being assigned and
1467 the size can be accomodated */
1469 noOverLap (sym->usl.itmpStack, fsym) &&
1470 getSize (sym->type) >= getSize (fsym->type))
1479 /*-----------------------------------------------------------------*/
1480 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
1481 /*-----------------------------------------------------------------*/
1483 spillLRWithPtrReg (symbol * forSym)
1489 debugLog ("%s\n", __FUNCTION__);
1490 if (!_G.regAssigned ||
1491 bitVectIsZero (_G.regAssigned))
1494 r0 = pic16_regWithIdx (R0_IDX);
1495 r1 = pic16_regWithIdx (R1_IDX);
1497 /* for all live ranges */
1498 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1499 lrsym = hTabNextItem (liveRanges, &k))
1503 /* if no registers assigned to it or
1505 /* if it does not overlap with this then
1506 not need to spill it */
1508 if (lrsym->isspilt || !lrsym->nRegs ||
1509 (lrsym->liveTo < forSym->liveFrom))
1512 /* go thru the registers : if it is either
1513 r0 or r1 then spil it */
1514 for (j = 0; j < lrsym->nRegs; j++)
1515 if (lrsym->regs[j] == r0 ||
1516 lrsym->regs[j] == r1)
1525 /*-----------------------------------------------------------------*/
1526 /* createStackSpil - create a location on the stack to spil */
1527 /*-----------------------------------------------------------------*/
1529 createStackSpil (symbol * sym)
1531 symbol *sloc = NULL;
1532 int useXstack, model, noOverlay;
1534 char slocBuffer[30];
1535 debugLog ("%s\n", __FUNCTION__);
1537 /* first go try and find a free one that is already
1538 existing on the stack */
1539 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1541 /* found a free one : just update & return */
1542 sym->usl.spillLoc = sloc;
1545 addSetHead (&sloc->usl.itmpStack, sym);
1549 /* could not then have to create one , this is the hard part
1550 we need to allocate this on the stack : this is really a
1551 hack!! but cannot think of anything better at this time */
1553 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1555 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1556 __FILE__, __LINE__);
1560 sloc = newiTemp (slocBuffer);
1562 /* set the type to the spilling symbol */
1563 sloc->type = copyLinkChain (sym->type);
1564 sloc->etype = getSpec (sloc->type);
1565 SPEC_SCLS (sloc->etype) = S_DATA;
1566 SPEC_EXTR (sloc->etype) = 0;
1567 SPEC_STAT (sloc->etype) = 0;
1569 /* we don't allow it to be allocated`
1570 onto the external stack since : so we
1571 temporarily turn it off ; we also
1572 turn off memory model to prevent
1573 the spil from going to the external storage
1574 and turn off overlaying
1577 useXstack = options.useXstack;
1578 model = options.model;
1579 noOverlay = options.noOverlay;
1580 options.noOverlay = 1;
1581 options.model = options.useXstack = 0;
1585 options.useXstack = useXstack;
1586 options.model = model;
1587 options.noOverlay = noOverlay;
1588 sloc->isref = 1; /* to prevent compiler warning */
1590 /* if it is on the stack then update the stack */
1591 if (IN_STACK (sloc->etype))
1593 currFunc->stack += getSize (sloc->type);
1594 _G.stackExtend += getSize (sloc->type);
1597 _G.dataExtend += getSize (sloc->type);
1599 /* add it to the _G.stackSpil set */
1600 addSetHead (&_G.stackSpil, sloc);
1601 sym->usl.spillLoc = sloc;
1604 /* add it to the set of itempStack set
1605 of the spill location */
1606 addSetHead (&sloc->usl.itmpStack, sym);
1610 /*-----------------------------------------------------------------*/
1611 /* isSpiltOnStack - returns true if the spil location is on stack */
1612 /*-----------------------------------------------------------------*/
1614 isSpiltOnStack (symbol * sym)
1618 debugLog ("%s\n", __FUNCTION__);
1625 /* if (sym->_G.stackSpil) */
1628 if (!sym->usl.spillLoc)
1631 etype = getSpec (sym->usl.spillLoc->type);
1632 if (IN_STACK (etype))
1638 /*-----------------------------------------------------------------*/
1639 /* spillThis - spils a specific operand */
1640 /*-----------------------------------------------------------------*/
1642 spillThis (symbol * sym)
1645 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1647 /* if this is rematerializable or has a spillLocation
1648 we are okay, else we need to create a spillLocation
1650 if (!(sym->remat || sym->usl.spillLoc))
1651 createStackSpil (sym);
1654 /* mark it has spilt & put it in the spilt set */
1656 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1658 bitVectUnSetBit (_G.regAssigned, sym->key);
1660 for (i = 0; i < sym->nRegs; i++)
1664 freeReg (sym->regs[i]);
1665 sym->regs[i] = NULL;
1668 /* if spilt on stack then free up r0 & r1
1669 if they could have been assigned to some
1671 if (!pic16_ptrRegReq && isSpiltOnStack (sym))
1674 spillLRWithPtrReg (sym);
1677 if (sym->usl.spillLoc && !sym->remat)
1678 sym->usl.spillLoc->allocreq = 1;
1682 /*-----------------------------------------------------------------*/
1683 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1684 /*-----------------------------------------------------------------*/
1686 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1688 bitVect *lrcs = NULL;
1692 debugLog ("%s\n", __FUNCTION__);
1693 /* get the spillable live ranges */
1694 lrcs = computeSpillable (ic);
1696 /* get all live ranges that are rematerizable */
1697 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1700 /* return the least used of these */
1701 return leastUsedLR (selectS);
1704 /* get live ranges with spillLocations in direct space */
1705 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1707 sym = leastUsedLR (selectS);
1708 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1709 sym->usl.spillLoc->rname :
1710 sym->usl.spillLoc->name));
1712 /* mark it as allocation required */
1713 sym->usl.spillLoc->allocreq = 1;
1717 /* if the symbol is local to the block then */
1718 if (forSym->liveTo < ebp->lSeq)
1721 /* check if there are any live ranges allocated
1722 to registers that are not used in this block */
1723 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1725 sym = leastUsedLR (selectS);
1726 /* if this is not rematerializable */
1735 /* check if there are any live ranges that not
1736 used in the remainder of the block */
1737 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1739 sym = leastUsedLR (selectS);
1742 sym->remainSpil = 1;
1749 /* find live ranges with spillocation && not used as pointers */
1750 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1753 sym = leastUsedLR (selectS);
1754 /* mark this as allocation required */
1755 sym->usl.spillLoc->allocreq = 1;
1759 /* find live ranges with spillocation */
1760 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1763 sym = leastUsedLR (selectS);
1764 sym->usl.spillLoc->allocreq = 1;
1768 /* couldn't find then we need to create a spil
1769 location on the stack , for which one? the least
1771 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1774 /* return a created spil location */
1775 sym = createStackSpil (leastUsedLR (selectS));
1776 sym->usl.spillLoc->allocreq = 1;
1780 /* this is an extreme situation we will spill
1781 this one : happens very rarely but it does happen */
1787 /*-----------------------------------------------------------------*/
1788 /* spilSomething - spil some variable & mark registers as free */
1789 /*-----------------------------------------------------------------*/
1791 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1796 debugLog ("%s\n", __FUNCTION__);
1797 /* get something we can spil */
1798 ssym = selectSpil (ic, ebp, forSym);
1800 /* mark it as spilt */
1802 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1804 /* mark it as not register assigned &
1805 take it away from the set */
1806 bitVectUnSetBit (_G.regAssigned, ssym->key);
1808 /* mark the registers as free */
1809 for (i = 0; i < ssym->nRegs; i++)
1811 freeReg (ssym->regs[i]);
1813 /* if spilt on stack then free up r0 & r1
1814 if they could have been assigned to as gprs */
1815 if (!pic16_ptrRegReq && isSpiltOnStack (ssym))
1818 spillLRWithPtrReg (ssym);
1821 /* if this was a block level spil then insert push & pop
1822 at the start & end of block respectively */
1823 if (ssym->blockSpil)
1825 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1826 /* add push to the start of the block */
1827 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1828 ebp->sch->next : ebp->sch));
1829 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1830 /* add pop to the end of the block */
1831 addiCodeToeBBlock (ebp, nic, NULL);
1834 /* if spilt because not used in the remainder of the
1835 block then add a push before this instruction and
1836 a pop at the end of the block */
1837 if (ssym->remainSpil)
1840 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1841 /* add push just before this instruction */
1842 addiCodeToeBBlock (ebp, nic, ic);
1844 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1845 /* add pop to the end of the block */
1846 addiCodeToeBBlock (ebp, nic, NULL);
1855 /*-----------------------------------------------------------------*/
1856 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1857 /*-----------------------------------------------------------------*/
1859 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1864 debugLog ("%s\n", __FUNCTION__);
1866 /* try for a ptr type */
1867 if ((reg = allocReg (REG_PTR)))
1870 /* try for gpr type */
1871 if ((reg = allocReg (REG_GPR)))
1874 /* we have to spil */
1875 if (!spilSomething (ic, ebp, sym))
1878 /* make sure partially assigned registers aren't reused */
1879 for (j=0; j<=sym->nRegs; j++)
1881 sym->regs[j]->isFree = 0;
1883 /* this looks like an infinite loop but
1884 in really selectSpil will abort */
1888 /*-----------------------------------------------------------------*/
1889 /* getRegGpr - will try for GPR if not spil */
1890 /*-----------------------------------------------------------------*/
1892 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1897 debugLog ("%s\n", __FUNCTION__);
1899 /* try for gpr type */
1900 if ((reg = allocReg (REG_GPR)))
1903 if (!pic16_ptrRegReq)
1904 if ((reg = allocReg (REG_PTR)))
1907 /* we have to spil */
1908 if (!spilSomething (ic, ebp, sym))
1911 /* make sure partially assigned registers aren't reused */
1912 for (j=0; j<=sym->nRegs; j++)
1914 sym->regs[j]->isFree = 0;
1916 /* this looks like an infinite loop but
1917 in really selectSpil will abort */
1921 /*-----------------------------------------------------------------*/
1922 /* symHasReg - symbol has a given register */
1923 /*-----------------------------------------------------------------*/
1925 symHasReg (symbol * sym, regs * reg)
1929 debugLog ("%s\n", __FUNCTION__);
1930 for (i = 0; i < sym->nRegs; i++)
1931 if (sym->regs[i] == reg)
1937 /*-----------------------------------------------------------------*/
1938 /* deassignLRs - check the live to and if they have registers & are */
1939 /* not spilt then free up the registers */
1940 /*-----------------------------------------------------------------*/
1942 deassignLRs (iCode * ic, eBBlock * ebp)
1948 debugLog ("%s\n", __FUNCTION__);
1949 for (sym = hTabFirstItem (liveRanges, &k); sym;
1950 sym = hTabNextItem (liveRanges, &k))
1953 symbol *psym = NULL;
1954 /* if it does not end here */
1955 if (sym->liveTo > ic->seq)
1958 /* if it was spilt on stack then we can
1959 mark the stack spil location as free */
1964 sym->usl.spillLoc->isFree = 1;
1970 if (!bitVectBitValue (_G.regAssigned, sym->key))
1973 /* special case check if this is an IFX &
1974 the privious one was a pop and the
1975 previous one was not spilt then keep track
1977 if (ic->op == IFX && ic->prev &&
1978 ic->prev->op == IPOP &&
1979 !ic->prev->parmPush &&
1980 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
1981 psym = OP_SYMBOL (IC_LEFT (ic->prev));
1987 bitVectUnSetBit (_G.regAssigned, sym->key);
1989 /* if the result of this one needs registers
1990 and does not have it then assign it right
1992 if (IC_RESULT (ic) &&
1993 !(SKIP_IC2 (ic) || /* not a special icode */
1994 ic->op == JUMPTABLE ||
1999 POINTER_SET (ic)) &&
2000 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
2001 result->liveTo > ic->seq && /* and will live beyond this */
2002 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
2003 result->regType == sym->regType && /* same register types */
2004 result->nRegs && /* which needs registers */
2005 !result->isspilt && /* and does not already have them */
2007 !bitVectBitValue (_G.regAssigned, result->key) &&
2008 /* the number of free regs + number of regs in this LR
2009 can accomodate the what result Needs */
2010 ((nfreeRegsType (result->regType) +
2011 sym->nRegs) >= result->nRegs)
2015 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2017 result->regs[i] = sym->regs[i];
2019 result->regs[i] = getRegGpr (ic, ebp, result);
2021 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2025 /* free the remaining */
2026 for (; i < sym->nRegs; i++)
2030 if (!symHasReg (psym, sym->regs[i]))
2031 freeReg (sym->regs[i]);
2034 freeReg (sym->regs[i]);
2041 /*-----------------------------------------------------------------*/
2042 /* reassignLR - reassign this to registers */
2043 /*-----------------------------------------------------------------*/
2045 reassignLR (operand * op)
2047 symbol *sym = OP_SYMBOL (op);
2050 debugLog ("%s\n", __FUNCTION__);
2051 /* not spilt any more */
2052 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2053 bitVectUnSetBit (_G.spiltSet, sym->key);
2055 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2059 for (i = 0; i < sym->nRegs; i++)
2060 sym->regs[i]->isFree = 0;
2063 /*-----------------------------------------------------------------*/
2064 /* willCauseSpill - determines if allocating will cause a spill */
2065 /*-----------------------------------------------------------------*/
2067 willCauseSpill (int nr, int rt)
2069 debugLog ("%s\n", __FUNCTION__);
2070 /* first check if there are any avlb registers
2071 of te type required */
2074 /* special case for pointer type
2075 if pointer type not avlb then
2076 check for type gpr */
2077 if (nFreeRegs (rt) >= nr)
2079 if (nFreeRegs (REG_GPR) >= nr)
2084 if (pic16_ptrRegReq)
2086 if (nFreeRegs (rt) >= nr)
2091 if (nFreeRegs (REG_PTR) +
2092 nFreeRegs (REG_GPR) >= nr)
2097 debugLog (" ... yep it will (cause a spill)\n");
2098 /* it will cause a spil */
2102 /*-----------------------------------------------------------------*/
2103 /* positionRegs - the allocator can allocate same registers to res- */
2104 /* ult and operand, if this happens make sure they are in the same */
2105 /* position as the operand otherwise chaos results */
2106 /*-----------------------------------------------------------------*/
2108 positionRegs (symbol * result, symbol * opsym, int lineno)
2110 int count = min (result->nRegs, opsym->nRegs);
2111 int i, j = 0, shared = 0;
2113 debugLog ("%s\n", __FUNCTION__);
2114 /* if the result has been spilt then cannot share */
2119 /* first make sure that they actually share */
2120 for (i = 0; i < count; i++)
2122 for (j = 0; j < count; j++)
2124 if (result->regs[i] == opsym->regs[j] && i != j)
2134 regs *tmp = result->regs[i];
2135 result->regs[i] = result->regs[j];
2136 result->regs[j] = tmp;
2141 /*------------------------------------------------------------------*/
2142 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2143 /* it should either have registers or have beed spilled. Otherwise, */
2144 /* there was an uninitialized variable, so just spill this to get */
2145 /* the operand in a valid state. */
2146 /*------------------------------------------------------------------*/
2148 verifyRegsAssigned (operand *op, iCode * ic)
2153 if (!IS_ITEMP (op)) return;
2155 sym = OP_SYMBOL (op);
2156 if (sym->isspilt) return;
2157 if (!sym->nRegs) return;
2158 if (sym->regs[0]) return;
2160 werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2161 sym->prereqv ? sym->prereqv->name : sym->name);
2166 /*-----------------------------------------------------------------*/
2167 /* serialRegAssign - serially allocate registers to the variables */
2168 /*-----------------------------------------------------------------*/
2170 serialRegAssign (eBBlock ** ebbs, int count)
2174 debugLog ("%s\n", __FUNCTION__);
2175 /* for all blocks */
2176 for (i = 0; i < count; i++)
2181 if (ebbs[i]->noPath &&
2182 (ebbs[i]->entryLabel != entryLabel &&
2183 ebbs[i]->entryLabel != returnLabel))
2186 /* of all instructions do */
2187 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2190 debugLog (" op: %s\n", decodeOp (ic->op));
2192 if(IC_RESULT(ic) && !IS_ITEMP( IC_RESULT(ic)))
2193 pic16_allocDirReg(IC_RESULT(ic));
2195 if(IC_LEFT(ic) && !IS_ITEMP( IC_LEFT(ic)))
2196 pic16_allocDirReg(IC_LEFT(ic));
2198 if(IC_RIGHT(ic) && !IS_ITEMP( IC_RIGHT(ic)))
2199 pic16_allocDirReg(IC_RIGHT(ic));
2201 /* if this is an ipop that means some live
2202 range will have to be assigned again */
2204 reassignLR (IC_LEFT (ic));
2206 /* if result is present && is a true symbol */
2207 if (IC_RESULT (ic) && ic->op != IFX &&
2208 IS_TRUE_SYMOP (IC_RESULT (ic)))
2209 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2211 /* take away registers from live
2212 ranges that end at this instruction */
2213 deassignLRs (ic, ebbs[i]);
2215 /* some don't need registers */
2216 if (SKIP_IC2 (ic) ||
2217 ic->op == JUMPTABLE ||
2221 (IC_RESULT (ic) && POINTER_SET (ic)))
2224 /* now we need to allocate registers
2225 only for the result */
2228 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2234 /* if it does not need or is spilt
2235 or is already assigned to registers
2236 or will not live beyond this instructions */
2239 bitVectBitValue (_G.regAssigned, sym->key) ||
2240 sym->liveTo <= ic->seq)
2243 /* if some liverange has been spilt at the block level
2244 and this one live beyond this block then spil this
2246 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2251 /* if trying to allocate this will cause
2252 a spill and there is nothing to spill
2253 or this one is rematerializable then
2255 willCS = willCauseSpill (sym->nRegs, sym->regType);
2256 spillable = computeSpillable (ic);
2258 (willCS && bitVectIsZero (spillable)))
2266 /* If the live range preceeds the point of definition
2267 then ideally we must take into account registers that
2268 have been allocated after sym->liveFrom but freed
2269 before ic->seq. This is complicated, so spill this
2270 symbol instead and let fillGaps handle the allocation. */
2271 if (sym->liveFrom < ic->seq)
2277 /* if it has a spillocation & is used less than
2278 all other live ranges then spill this */
2280 if (sym->usl.spillLoc) {
2281 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2282 allLRs, ebbs[i], ic));
2283 if (leastUsed && leastUsed->used > sym->used) {
2288 /* if none of the liveRanges have a spillLocation then better
2289 to spill this one than anything else already assigned to registers */
2290 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2291 /* if this is local to this block then we might find a block spil */
2292 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2300 if (ic->op == RECEIVE)
2301 debugLog ("When I get clever, I'll optimize the receive logic\n");
2303 /* if we need ptr regs for the right side
2305 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2306 <= (unsigned) PTRSIZE)
2311 /* else we assign registers to it */
2312 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2314 debugLog (" %d - nRegs: %d\n", __LINE__, sym->nRegs);
2316 bitVectDebugOn(_G.regAssigned, debugF);
2318 for (j = 0; j < sym->nRegs; j++)
2320 if (sym->regType == REG_PTR)
2321 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2323 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2325 /* if the allocation falied which means
2326 this was spilt then break */
2330 debugLog (" %d - \n", __LINE__);
2332 /* if it shares registers with operands make sure
2333 that they are in the same position */
2334 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2335 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2336 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2337 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2338 /* do the same for the right operand */
2339 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2340 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2341 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2342 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2344 debugLog (" %d - \n", __LINE__);
2347 debugLog (" %d - \n", __LINE__);
2356 /* Check for and fix any problems with uninitialized operands */
2357 for (i = 0; i < count; i++)
2361 if (ebbs[i]->noPath &&
2362 (ebbs[i]->entryLabel != entryLabel &&
2363 ebbs[i]->entryLabel != returnLabel))
2366 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2373 verifyRegsAssigned (IC_COND (ic), ic);
2377 if (ic->op == JUMPTABLE)
2379 verifyRegsAssigned (IC_JTCOND (ic), ic);
2383 verifyRegsAssigned (IC_RESULT (ic), ic);
2384 verifyRegsAssigned (IC_LEFT (ic), ic);
2385 verifyRegsAssigned (IC_RIGHT (ic), ic);
2391 /*-----------------------------------------------------------------*/
2392 /* rUmaskForOp :- returns register mask for an operand */
2393 /*-----------------------------------------------------------------*/
2395 rUmaskForOp (operand * op)
2401 debugLog ("%s\n", __FUNCTION__);
2402 /* only temporaries are assigned registers */
2406 sym = OP_SYMBOL (op);
2408 /* if spilt or no registers assigned to it
2410 if (sym->isspilt || !sym->nRegs)
2413 rumask = newBitVect (pic16_nRegs);
2415 for (j = 0; j < sym->nRegs; j++)
2417 rumask = bitVectSetBit (rumask,
2418 sym->regs[j]->rIdx);
2424 /*-----------------------------------------------------------------*/
2425 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2426 /*-----------------------------------------------------------------*/
2428 regsUsedIniCode (iCode * ic)
2430 bitVect *rmask = newBitVect (pic16_nRegs);
2432 debugLog ("%s\n", __FUNCTION__);
2433 /* do the special cases first */
2436 rmask = bitVectUnion (rmask,
2437 rUmaskForOp (IC_COND (ic)));
2441 /* for the jumptable */
2442 if (ic->op == JUMPTABLE)
2444 rmask = bitVectUnion (rmask,
2445 rUmaskForOp (IC_JTCOND (ic)));
2450 /* of all other cases */
2452 rmask = bitVectUnion (rmask,
2453 rUmaskForOp (IC_LEFT (ic)));
2457 rmask = bitVectUnion (rmask,
2458 rUmaskForOp (IC_RIGHT (ic)));
2461 rmask = bitVectUnion (rmask,
2462 rUmaskForOp (IC_RESULT (ic)));
2468 /*-----------------------------------------------------------------*/
2469 /* createRegMask - for each instruction will determine the regsUsed */
2470 /*-----------------------------------------------------------------*/
2472 createRegMask (eBBlock ** ebbs, int count)
2476 debugLog ("%s\n", __FUNCTION__);
2477 /* for all blocks */
2478 for (i = 0; i < count; i++)
2482 if (ebbs[i]->noPath &&
2483 (ebbs[i]->entryLabel != entryLabel &&
2484 ebbs[i]->entryLabel != returnLabel))
2487 /* for all instructions */
2488 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2493 if (SKIP_IC2 (ic) || !ic->rlive)
2496 /* first mark the registers used in this
2498 ic->rUsed = regsUsedIniCode (ic);
2499 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2501 /* now create the register mask for those
2502 registers that are in use : this is a
2503 super set of ic->rUsed */
2504 ic->rMask = newBitVect (pic16_nRegs + 1);
2506 /* for all live Ranges alive at this point */
2507 for (j = 1; j < ic->rlive->size; j++)
2512 /* if not alive then continue */
2513 if (!bitVectBitValue (ic->rlive, j))
2516 /* find the live range we are interested in */
2517 if (!(sym = hTabItemWithKey (liveRanges, j)))
2519 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2520 "createRegMask cannot find live range");
2524 /* if no register assigned to it */
2525 if (!sym->nRegs || sym->isspilt)
2528 /* for all the registers allocated to it */
2529 for (k = 0; k < sym->nRegs; k++)
2532 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2538 /*-----------------------------------------------------------------*/
2539 /* rematStr - returns the rematerialized string for a remat var */
2540 /*-----------------------------------------------------------------*/
2542 rematStr (symbol * sym)
2545 iCode *ic = sym->rematiCode;
2546 symbol *psym = NULL;
2548 debugLog ("%s\n", __FUNCTION__);
2550 //printf ("%s\n", s);
2552 /* if plus or minus print the right hand side */
2554 if (ic->op == '+' || ic->op == '-') {
2556 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2558 sprintf (s, "(%s %c 0x%04x)",
2559 OP_SYMBOL (IC_LEFT (ric))->rname,
2561 (int) operandLitValue (IC_RIGHT (ic)));
2564 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2566 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2567 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2572 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2573 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2575 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2580 /*-----------------------------------------------------------------*/
2581 /* rematStr - returns the rematerialized string for a remat var */
2582 /*-----------------------------------------------------------------*/
2584 rematStr (symbol * sym)
2587 iCode *ic = sym->rematiCode;
2589 debugLog ("%s\n", __FUNCTION__);
2594 /* if plus or minus print the right hand side */
2596 if (ic->op == '+' || ic->op == '-') {
2597 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2600 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2604 if (ic->op == '+' || ic->op == '-')
2606 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2607 sprintf (s, "(%s %c 0x%04x)",
2608 OP_SYMBOL (IC_LEFT (ric))->rname,
2610 (int) operandLitValue (IC_RIGHT (ic)));
2613 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2615 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2619 /* we reached the end */
2620 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2624 printf ("%s\n", buffer);
2629 /*-----------------------------------------------------------------*/
2630 /* regTypeNum - computes the type & number of registers required */
2631 /*-----------------------------------------------------------------*/
2639 debugLog ("%s\n", __FUNCTION__);
2640 /* for each live range do */
2641 for (sym = hTabFirstItem (liveRanges, &k); sym;
2642 sym = hTabNextItem (liveRanges, &k)) {
2644 debugLog (" %d - %s\n", __LINE__, sym->rname);
2645 //fprintf(stderr," %d - %s\n", __LINE__, sym->rname);
2647 /* if used zero times then no registers needed */
2648 if ((sym->liveTo - sym->liveFrom) == 0)
2652 /* if the live range is a temporary */
2655 debugLog (" %d - itemp register\n", __LINE__);
2657 /* if the type is marked as a conditional */
2658 if (sym->regType == REG_CND)
2661 /* if used in return only then we don't
2663 if (sym->ruonly || sym->accuse) {
2664 if (IS_AGGREGATE (sym->type) || sym->isptr)
2665 sym->type = aggrToPtr (sym->type, FALSE);
2666 debugLog (" %d - no reg needed - used as a return\n", __LINE__);
2671 /* if the symbol has only one definition &
2672 that definition is a get_pointer and the
2673 pointer we are getting is rematerializable and
2676 if (bitVectnBitsOn (sym->defs) == 1 &&
2677 (ic = hTabItemWithKey (iCodehTab,
2678 bitVectFirstBit (sym->defs))) &&
2680 !IS_BITVAR (sym->etype) &&
2681 (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2683 if (ptrPseudoSymSafe (sym, ic)) {
2687 debugLog (" %d - \n", __LINE__);
2689 /* create a psuedo symbol & force a spil */
2690 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2691 psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2692 psym->type = sym->type;
2693 psym->etype = sym->etype;
2694 psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2695 strcpy (psym->rname, psym->name);
2697 sym->usl.spillLoc = psym;
2701 /* if in data space or idata space then try to
2702 allocate pointer register */
2706 /* if not then we require registers */
2707 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2708 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2709 getSize (sym->type));
2713 if(IS_PTR_CONST (sym->type)) {
2715 if(IS_CODEPTR (sym->type)) {
2717 // what IS this ???? (HJD)
2718 debugLog (" %d const pointer type requires %d registers, changing to 3\n",__LINE__,sym->nRegs); // patch 14
2719 sym->nRegs = 3; // patch 14
2722 if (sym->nRegs > 4) {
2723 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2724 printTypeChain (sym->type, stderr);
2725 fprintf (stderr, "\n");
2728 /* determine the type of register required */
2729 if (sym->nRegs == 1 &&
2730 IS_PTR (sym->type) &&
2732 sym->regType = REG_PTR;
2734 sym->regType = REG_GPR;
2737 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2741 /* for the first run we don't provide */
2742 /* registers for true symbols we will */
2743 /* see how things go */
2748 static DEFSETFUNC (markRegFree)
2750 ((regs *)item)->isFree = 1;
2755 DEFSETFUNC (pic16_deallocReg)
2757 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2758 ((regs *)item)->isFree = 1;
2759 ((regs *)item)->wasUsed = 0;
2763 /*-----------------------------------------------------------------*/
2764 /* freeAllRegs - mark all registers as free */
2765 /*-----------------------------------------------------------------*/
2767 pic16_freeAllRegs ()
2769 debugLog ("%s\n", __FUNCTION__);
2771 applyToSet(pic16_dynAllocRegs,markRegFree);
2772 applyToSet(pic16_dynStackRegs,markRegFree);
2775 /*-----------------------------------------------------------------*/
2776 /*-----------------------------------------------------------------*/
2778 pic16_deallocateAllRegs ()
2780 debugLog ("%s\n", __FUNCTION__);
2782 applyToSet(pic16_dynAllocRegs,pic16_deallocReg);
2786 /*-----------------------------------------------------------------*/
2787 /* deallocStackSpil - this will set the stack pointer back */
2788 /*-----------------------------------------------------------------*/
2790 DEFSETFUNC (deallocStackSpil)
2794 debugLog ("%s\n", __FUNCTION__);
2799 /*-----------------------------------------------------------------*/
2800 /* farSpacePackable - returns the packable icode for far variables */
2801 /*-----------------------------------------------------------------*/
2803 farSpacePackable (iCode * ic)
2807 debugLog ("%s\n", __FUNCTION__);
2808 /* go thru till we find a definition for the
2809 symbol on the right */
2810 for (dic = ic->prev; dic; dic = dic->prev)
2813 /* if the definition is a call then no */
2814 if ((dic->op == CALL || dic->op == PCALL) &&
2815 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2820 /* if shift by unknown amount then not */
2821 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2822 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2825 /* if pointer get and size > 1 */
2826 if (POINTER_GET (dic) &&
2827 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2830 if (POINTER_SET (dic) &&
2831 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2834 /* if any three is a true symbol in far space */
2835 if (IC_RESULT (dic) &&
2836 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2837 isOperandInFarSpace (IC_RESULT (dic)))
2840 if (IC_RIGHT (dic) &&
2841 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2842 isOperandInFarSpace (IC_RIGHT (dic)) &&
2843 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2846 if (IC_LEFT (dic) &&
2847 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2848 isOperandInFarSpace (IC_LEFT (dic)) &&
2849 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2852 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2854 if ((dic->op == LEFT_OP ||
2855 dic->op == RIGHT_OP ||
2857 IS_OP_LITERAL (IC_RIGHT (dic)))
2867 /*-----------------------------------------------------------------*/
2868 /* packRegsForAssign - register reduction for assignment */
2869 /*-----------------------------------------------------------------*/
2871 packRegsForAssign (iCode * ic, eBBlock * ebp)
2876 debugLog ("%d\t%s\n", __LINE__, __FUNCTION__);
2877 debugLog ("ic->op = %s\n", decodeOp( ic->op ) );
2878 debugAopGet (" result:", IC_RESULT (ic));
2879 debugAopGet (" left:", IC_LEFT (ic));
2880 debugAopGet (" right:", IC_RIGHT (ic));
2882 // fprintf(stderr, "%s:%d symbol = %s\n", __FILE__, __LINE__, OP_SYMBOL( IC_RESULT(ic))->name);
2884 debugLog(" %d - actuall processing\n", __LINE__ );
2886 if (!IS_ITEMP (IC_RESULT (ic))) {
2887 pic16_allocDirReg(IC_RESULT (ic));
2888 debugLog (" %d - result is not temp\n", __LINE__);
2892 /* See BUGLOG0001 - VR */
2894 if (!IS_ITEMP (IC_RIGHT (ic))) {
2895 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2896 pic16_allocDirReg(IC_RIGHT (ic));
2901 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2902 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2904 debugLog (" %d - not packing - right side fails \n", __LINE__);
2908 /* if the true symbol is defined in far space or on stack
2909 then we should not since this will increase register pressure */
2910 if (isOperandInFarSpace (IC_RESULT (ic)))
2912 if ((dic = farSpacePackable (ic)))
2919 /* find the definition of iTempNN scanning backwards if we find a
2920 a use of the true symbol before we find the definition then
2922 for (dic = ic->prev; dic; dic = dic->prev)
2925 /* if there is a function call and this is
2926 a parameter & not my parameter then don't pack it */
2927 if ((dic->op == CALL || dic->op == PCALL) &&
2928 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2929 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2931 debugLog (" %d - \n", __LINE__);
2940 debugLog("%d\tSearching for iTempNN\n", __LINE__);
2942 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2943 IS_OP_VOLATILE (IC_RESULT (dic)))
2945 debugLog (" %d - dic is VOLATILE \n", __LINE__);
2951 if( IS_SYMOP( IC_RESULT(dic)) &&
2952 IS_BITFIELD( OP_SYMBOL(IC_RESULT(dic))->etype ) ) {
2954 debugLog (" %d - result is bitfield\n", __LINE__);
2960 if (IS_SYMOP (IC_RESULT (dic)) &&
2961 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2963 /* A previous result was assigned to the same register - we'll our definition */
2964 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
2965 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
2966 if (POINTER_SET (dic))
2972 if (IS_SYMOP (IC_RIGHT (dic)) &&
2973 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
2974 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2976 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
2981 if (IS_SYMOP (IC_LEFT (dic)) &&
2982 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2983 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2985 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
2990 if (POINTER_SET (dic) &&
2991 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
2993 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
3001 return 0; /* did not find */
3004 /* This code is taken from the hc08 port. Do not know
3005 * if it fits for pic16, but I leave it here just in case */
3007 /* if assignment then check that right is not a bit */
3008 if (ASSIGNMENT (dic) && !POINTER_SET (dic)) {
3009 sym_link *etype = operandType (IC_RIGHT (dic));
3011 if (IS_BITFIELD (etype)) {
3012 /* if result is a bit too then it's ok */
3013 etype = operandType (IC_RESULT (dic));
3014 if (!IS_BITFIELD (etype)) {
3015 debugLog(" %d bitfields\n");
3022 /* if the result is on stack or iaccess then it must be
3023 the same atleast one of the operands */
3024 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3025 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3027 /* the operation has only one symbol
3028 operator then we can pack */
3029 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3030 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3033 if (!((IC_LEFT (dic) &&
3034 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3036 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3040 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3041 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3042 /* found the definition */
3043 /* replace the result with the result of */
3044 /* this assignment and remove this assignment */
3045 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3046 IC_RESULT (dic) = IC_RESULT (ic);
3048 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3050 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3052 /* delete from liverange table also
3053 delete from all the points inbetween and the new
3055 for (sic = dic; sic != ic; sic = sic->next)
3057 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3058 if (IS_ITEMP (IC_RESULT (dic)))
3059 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3062 remiCodeFromeBBlock (ebp, ic);
3063 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3065 debugLog(" %d\n", __LINE__ );
3066 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3067 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3075 #define NO_packRegsForAccUse
3076 #define NO_packRegsForSupport
3077 #define NO_packRegsForOneuse
3078 #define NO_cast_peep
3083 #ifndef NO_packRegsForSupport
3084 /*-----------------------------------------------------------------*/
3085 /* findAssignToSym : scanning backwards looks for first assig found */
3086 /*-----------------------------------------------------------------*/
3088 findAssignToSym (operand * op, iCode * ic)
3092 debugLog ("%s\n", __FUNCTION__);
3093 for (dic = ic->prev; dic; dic = dic->prev)
3096 /* if definition by assignment */
3097 if (dic->op == '=' &&
3098 !POINTER_SET (dic) &&
3099 IC_RESULT (dic)->key == op->key
3100 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3104 /* we are interested only if defined in far space */
3105 /* or in stack space in case of + & - */
3107 /* if assigned to a non-symbol then return
3109 if (!IS_SYMOP (IC_RIGHT (dic)))
3112 /* if the symbol is in far space then
3114 if (isOperandInFarSpace (IC_RIGHT (dic)))
3117 /* for + & - operations make sure that
3118 if it is on the stack it is the same
3119 as one of the three operands */
3120 if ((ic->op == '+' || ic->op == '-') &&
3121 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3123 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3124 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3125 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3133 /* if we find an usage then we cannot delete it */
3134 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3137 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3140 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3144 /* now make sure that the right side of dic
3145 is not defined between ic & dic */
3148 iCode *sic = dic->next;
3150 for (; sic != ic; sic = sic->next)
3151 if (IC_RESULT (sic) &&
3152 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3163 #ifndef NO_packRegsForSupport
3164 /*-----------------------------------------------------------------*/
3165 /* packRegsForSupport :- reduce some registers for support calls */
3166 /*-----------------------------------------------------------------*/
3168 packRegsForSupport (iCode * ic, eBBlock * ebp)
3172 debugLog ("%s\n", __FUNCTION__);
3173 /* for the left & right operand :- look to see if the
3174 left was assigned a true symbol in far space in that
3175 case replace them */
3176 if (IS_ITEMP (IC_LEFT (ic)) &&
3177 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3179 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3185 debugAopGet ("removing left:", IC_LEFT (ic));
3187 /* found it we need to remove it from the
3189 for (sic = dic; sic != ic; sic = sic->next)
3190 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3192 IC_LEFT (ic)->operand.symOperand =
3193 IC_RIGHT (dic)->operand.symOperand;
3194 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3195 remiCodeFromeBBlock (ebp, dic);
3196 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3197 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3201 /* do the same for the right operand */
3204 IS_ITEMP (IC_RIGHT (ic)) &&
3205 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3207 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3213 /* if this is a subtraction & the result
3214 is a true symbol in far space then don't pack */
3215 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3217 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3218 if (IN_FARSPACE (SPEC_OCLS (etype)))
3222 debugAopGet ("removing right:", IC_RIGHT (ic));
3224 /* found it we need to remove it from the
3226 for (sic = dic; sic != ic; sic = sic->next)
3227 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3229 IC_RIGHT (ic)->operand.symOperand =
3230 IC_RIGHT (dic)->operand.symOperand;
3231 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3233 remiCodeFromeBBlock (ebp, dic);
3234 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3235 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3244 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3246 #ifndef NO_packRegsForOneuse
3247 /*-----------------------------------------------------------------*/
3248 /* packRegsForOneuse : - will reduce some registers for single Use */
3249 /*-----------------------------------------------------------------*/
3251 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3256 debugLog ("%s\n", __FUNCTION__);
3257 /* if returning a literal then do nothing */
3261 /* only upto 2 bytes since we cannot predict
3262 the usage of b, & acc */
3263 if (getSize (operandType (op)) > (pic16_fReturnSizePic - 3) && /* was 2, changed to 3 -- VR */
3268 /* this routine will mark the a symbol as used in one
3269 instruction use only && if the definition is local
3270 (ie. within the basic block) && has only one definition &&
3271 that definition is either a return value from a
3272 function or does not contain any variables in
3274 uses = bitVectCopy (OP_USES (op));
3275 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3276 if (!bitVectIsZero (uses)) /* has other uses */
3279 /* if it has only one defintion */
3280 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3281 return NULL; /* has more than one definition */
3283 /* get that definition */
3285 hTabItemWithKey (iCodehTab,
3286 bitVectFirstBit (OP_DEFS (op)))))
3289 /* found the definition now check if it is local */
3290 if (dic->seq < ebp->fSeq ||
3291 dic->seq > ebp->lSeq)
3292 return NULL; /* non-local */
3294 /* now check if it is the return from
3296 if (dic->op == CALL || dic->op == PCALL)
3298 if (ic->op != SEND && ic->op != RETURN &&
3299 !POINTER_SET(ic) && !POINTER_GET(ic))
3301 OP_SYMBOL (op)->ruonly = 1;
3308 /* otherwise check that the definition does
3309 not contain any symbols in far space */
3310 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3311 isOperandInFarSpace (IC_RIGHT (dic)) ||
3312 IS_OP_RUONLY (IC_LEFT (ic)) ||
3313 IS_OP_RUONLY (IC_RIGHT (ic)))
3318 /* if pointer set then make sure the pointer
3320 if (POINTER_SET (dic) &&
3321 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3324 if (POINTER_GET (dic) &&
3325 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3330 /* also make sure the intervenening instructions
3331 don't have any thing in far space */
3332 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3335 /* if there is an intervening function call then no */
3336 if (dic->op == CALL || dic->op == PCALL)
3338 /* if pointer set then make sure the pointer
3340 if (POINTER_SET (dic) &&
3341 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3344 if (POINTER_GET (dic) &&
3345 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3348 /* if address of & the result is remat then okay */
3349 if (dic->op == ADDRESS_OF &&
3350 OP_SYMBOL (IC_RESULT (dic))->remat)
3353 /* if operand has size of three or more & this
3354 operation is a '*','/' or '%' then 'b' may
3356 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3357 getSize (operandType (op)) >= 3)
3360 /* if left or right or result is in far space */
3361 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3362 isOperandInFarSpace (IC_RIGHT (dic)) ||
3363 isOperandInFarSpace (IC_RESULT (dic)) ||
3364 IS_OP_RUONLY (IC_LEFT (dic)) ||
3365 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3366 IS_OP_RUONLY (IC_RESULT (dic)))
3372 OP_SYMBOL (op)->ruonly = 1;
3379 /*-----------------------------------------------------------------*/
3380 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3381 /*-----------------------------------------------------------------*/
3383 isBitwiseOptimizable (iCode * ic)
3385 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3386 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3388 debugLog ("%s\n", __FUNCTION__);
3389 /* bitwise operations are considered optimizable
3390 under the following conditions (Jean-Louis VERN)
3402 if (IS_LITERAL (rtype) ||
3403 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3410 #ifndef NO_packRegsForAccUse
3412 /*-----------------------------------------------------------------*/
3413 /* packRegsForAccUse - pack registers for acc use */
3414 /*-----------------------------------------------------------------*/
3416 packRegsForAccUse (iCode * ic)
3420 debugLog ("%s\n", __FUNCTION__);
3422 /* if this is an aggregate, e.g. a one byte char array */
3423 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3426 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3428 /* if + or - then it has to be one byte result */
3429 if ((ic->op == '+' || ic->op == '-')
3430 && getSize (operandType (IC_RESULT (ic))) > 1)
3433 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3434 /* if shift operation make sure right side is not a literal */
3435 if (ic->op == RIGHT_OP &&
3436 (isOperandLiteral (IC_RIGHT (ic)) ||
3437 getSize (operandType (IC_RESULT (ic))) > 1))
3440 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3441 if (ic->op == LEFT_OP &&
3442 (isOperandLiteral (IC_RIGHT (ic)) ||
3443 getSize (operandType (IC_RESULT (ic))) > 1))
3446 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3447 if (IS_BITWISE_OP (ic) &&
3448 getSize (operandType (IC_RESULT (ic))) > 1)
3452 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3453 /* has only one definition */
3454 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3457 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3458 /* has only one use */
3459 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3462 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3463 /* and the usage immediately follows this iCode */
3464 if (!(uic = hTabItemWithKey (iCodehTab,
3465 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3468 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3469 if (ic->next != uic)
3472 /* if it is a conditional branch then we definitely can */
3476 if (uic->op == JUMPTABLE)
3479 /* if the usage is not is an assignment
3480 or an arithmetic / bitwise / shift operation then not */
3481 if (POINTER_SET (uic) &&
3482 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3485 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3486 if (uic->op != '=' &&
3487 !IS_ARITHMETIC_OP (uic) &&
3488 !IS_BITWISE_OP (uic) &&
3489 uic->op != LEFT_OP &&
3490 uic->op != RIGHT_OP)
3493 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3494 /* if used in ^ operation then make sure right is not a
3496 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3499 /* if shift operation make sure right side is not a literal */
3500 if (uic->op == RIGHT_OP &&
3501 (isOperandLiteral (IC_RIGHT (uic)) ||
3502 getSize (operandType (IC_RESULT (uic))) > 1))
3505 if (uic->op == LEFT_OP &&
3506 (isOperandLiteral (IC_RIGHT (uic)) ||
3507 getSize (operandType (IC_RESULT (uic))) > 1))
3510 /* make sure that the result of this icode is not on the
3511 stack, since acc is used to compute stack offset */
3512 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3513 OP_SYMBOL (IC_RESULT (uic))->onStack)
3516 /* if either one of them in far space then we cannot */
3517 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3518 isOperandInFarSpace (IC_LEFT (uic))) ||
3519 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3520 isOperandInFarSpace (IC_RIGHT (uic))))
3523 /* if the usage has only one operand then we can */
3524 if (IC_LEFT (uic) == NULL ||
3525 IC_RIGHT (uic) == NULL)
3528 /* make sure this is on the left side if not
3529 a '+' since '+' is commutative */
3530 if (ic->op != '+' &&
3531 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3535 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3536 /* if one of them is a literal then we can */
3537 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3538 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3539 (getSize (operandType (IC_RESULT (uic))) <= 1))
3541 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3546 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3547 /* if the other one is not on stack then we can */
3548 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3549 (IS_ITEMP (IC_RIGHT (uic)) ||
3550 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3551 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3554 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3555 (IS_ITEMP (IC_LEFT (uic)) ||
3556 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3557 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3563 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3564 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3571 /*-----------------------------------------------------------------*/
3572 /* packForPush - hueristics to reduce iCode for pushing */
3573 /*-----------------------------------------------------------------*/
3575 packForReceive (iCode * ic, eBBlock * ebp)
3579 debugLog ("%s\n", __FUNCTION__);
3580 debugAopGet (" result:", IC_RESULT (ic));
3581 debugAopGet (" left:", IC_LEFT (ic));
3582 debugAopGet (" right:", IC_RIGHT (ic));
3587 for (dic = ic->next; dic; dic = dic->next)
3592 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3593 debugLog (" used on left\n");
3594 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3595 debugLog (" used on right\n");
3596 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3597 debugLog (" used on result\n");
3599 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3600 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3605 debugLog (" hey we can remove this unnecessary assign\n");
3607 /*-----------------------------------------------------------------*/
3608 /* packForPush - hueristics to reduce iCode for pushing */
3609 /*-----------------------------------------------------------------*/
3611 packForPush (iCode * ic, eBBlock * ebp)
3615 debugLog ("%s\n", __FUNCTION__);
3616 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3619 /* must have only definition & one usage */
3620 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3621 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3624 /* find the definition */
3625 if (!(dic = hTabItemWithKey (iCodehTab,
3626 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3629 if (dic->op != '=' || POINTER_SET (dic))
3632 /* we now we know that it has one & only one def & use
3633 and the that the definition is an assignment */
3634 IC_LEFT (ic) = IC_RIGHT (dic);
3636 remiCodeFromeBBlock (ebp, dic);
3637 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3638 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3641 static void printSymType(char * str, sym_link *sl)
3643 if(!pic16_ralloc_debug)return;
3645 debugLog (" %s Symbol type: ",str);
3646 printTypeChain( sl, debugF);
3650 /*-----------------------------------------------------------------*/
3651 /* some debug code to print the symbol S_TYPE. Note that
3652 * the function checkSClass in src/SDCCsymt.c dinks with
3653 * the S_TYPE in ways the PIC port doesn't fully like...*/
3654 /*-----------------------------------------------------------------*/
3655 static void isData(sym_link *sl)
3659 if(!pic16_ralloc_debug)return;
3666 for ( ; sl; sl=sl->next) {
3668 switch (SPEC_SCLS(sl)) {
3669 case S_DATA: fprintf (of, "data "); break;
3670 case S_XDATA: fprintf (of, "xdata "); break;
3671 case S_SFR: fprintf (of, "sfr "); break;
3672 case S_SBIT: fprintf (of, "sbit "); break;
3673 case S_CODE: fprintf (of, "code "); break;
3674 case S_IDATA: fprintf (of, "idata "); break;
3675 case S_PDATA: fprintf (of, "pdata "); break;
3676 case S_LITERAL: fprintf (of, "literal "); break;
3677 case S_STACK: fprintf (of, "stack "); break;
3678 case S_XSTACK: fprintf (of, "xstack "); break;
3679 case S_BIT: fprintf (of, "bit "); break;
3680 case S_EEPROM: fprintf (of, "eeprom "); break;
3689 /*--------------------------------------------------------------------*/
3690 /* pic16_packRegisters - does some transformations to reduce */
3691 /* register pressure */
3693 /*--------------------------------------------------------------------*/
3695 pic16_packRegisters (eBBlock * ebp)
3700 debugLog ("%s\n", __FUNCTION__);
3706 /* look for assignments of the form */
3707 /* iTempNN = TRueSym (someoperation) SomeOperand */
3709 /* TrueSym := iTempNN:1 */
3710 for (ic = ebp->sch; ic; ic = ic->next)
3712 // debugLog("%d\n", __LINE__);
3713 /* find assignment of the form TrueSym := iTempNN:1 */
3714 /* see BUGLOG0001 for workaround with the CAST - VR */
3715 // if ( (ic->op == '=' || ic->op == CAST) && !POINTER_SET (ic) ) // patch 11
3716 if ( (ic->op == '=') && !POINTER_SET (ic) ) // patch 11
3717 change += packRegsForAssign (ic, ebp);
3721 if (POINTER_SET (ic))
3722 debugLog ("pointer is set\n");
3723 debugAopGet (" result:", IC_RESULT (ic));
3724 debugAopGet (" left:", IC_LEFT (ic));
3725 debugAopGet (" right:", IC_RIGHT (ic));
3734 for (ic = ebp->sch; ic; ic = ic->next) {
3736 if(IS_SYMOP ( IC_LEFT(ic))) {
3737 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3739 debugAopGet ("x left:", IC_LEFT (ic));
3741 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3743 if(IS_CODEPTR(OP_SYMBOL(IC_LEFT(ic))->type))
3745 debugLog (" is a pointer\n");
3747 if(IS_PTR(OP_SYMBOL(IC_LEFT(ic))->type))
3748 debugLog (" is a ptr\n");
3750 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3751 debugLog (" is volatile\n");
3755 if(IS_OP_VOLATILE(IC_LEFT(ic))) {
3756 debugLog (" %d - left is not temp, allocating\n", __LINE__);
3757 pic16_allocDirReg(IC_LEFT (ic));
3760 printSymType("c ", OP_SYMBOL(IC_LEFT(ic))->type);
3763 if(IS_SYMOP ( IC_RIGHT(ic))) {
3764 debugAopGet (" right:", IC_RIGHT (ic));
3765 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3768 if(IS_SYMOP ( IC_RESULT(ic))) {
3769 debugAopGet (" result:", IC_RESULT (ic));
3770 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3773 if(IS_TRUE_SYMOP ( IC_RIGHT(ic))) {
3774 debugAopGet (" right:", IC_RIGHT (ic));
3775 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3776 // pic16_allocDirReg(IC_RIGHT(ic));
3779 if(IS_TRUE_SYMOP ( IC_RESULT(ic))) {
3780 debugAopGet (" result:", IC_RESULT (ic));
3781 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3782 // pic16_allocDirReg(IC_RESULT(ic));
3786 if (POINTER_SET (ic))
3787 debugLog (" %d - Pointer set\n", __LINE__);
3790 /* if this is an itemp & result of a address of a true sym
3791 then mark this as rematerialisable */
3792 if (ic->op == ADDRESS_OF &&
3793 IS_ITEMP (IC_RESULT (ic)) &&
3794 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3795 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3796 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3799 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3801 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3802 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3803 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3807 /* if straight assignment then carry remat flag if
3808 this is the only definition */
3809 if (ic->op == '=' &&
3810 !POINTER_SET (ic) &&
3811 IS_SYMOP (IC_RIGHT (ic)) &&
3812 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3813 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3815 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3817 OP_SYMBOL (IC_RESULT (ic))->remat =
3818 OP_SYMBOL (IC_RIGHT (ic))->remat;
3819 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3820 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3823 /* if this is a +/- operation with a rematerizable
3824 then mark this as rematerializable as well */
3825 if ((ic->op == '+' || ic->op == '-') &&
3826 (IS_SYMOP (IC_LEFT (ic)) &&
3827 IS_ITEMP (IC_RESULT (ic)) &&
3828 OP_SYMBOL (IC_LEFT (ic))->remat &&
3829 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3830 IS_OP_LITERAL (IC_RIGHT (ic))))
3832 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3834 operandLitValue (IC_RIGHT (ic));
3835 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3836 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3837 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3840 /* mark the pointer usages */
3841 if (POINTER_SET (ic))
3843 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3844 debugLog (" marking as a pointer (set) =>");
3845 debugAopGet (" result:", IC_RESULT (ic));
3847 if (POINTER_GET (ic))
3849 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3850 debugLog (" marking as a pointer (get) =>");
3851 debugAopGet (" left:", IC_LEFT (ic));
3854 //debugLog(" %d %s\n", __LINE__, __FUNCTION__);
3858 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3859 /* if we are using a symbol on the stack
3860 then we should say pic16_ptrRegReq */
3861 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3862 pic16_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3863 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3864 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3865 pic16_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3866 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3870 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3871 if (IS_SYMOP (IC_LEFT (ic)))
3872 pic16_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3873 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3874 if (IS_SYMOP (IC_RIGHT (ic)))
3875 pic16_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3876 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3877 if (IS_SYMOP (IC_RESULT (ic)))
3878 pic16_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3879 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3882 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic16_ptrRegReq);
3886 /* if the condition of an if instruction
3887 is defined in the previous instruction then
3888 mark the itemp as a conditional */
3889 if ((IS_CONDITIONAL (ic) ||
3890 ((ic->op == BITWISEAND ||
3893 isBitwiseOptimizable (ic))) &&
3894 ic->next && ic->next->op == IFX &&
3895 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3896 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3899 debugLog (" %d\n", __LINE__);
3900 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3904 debugLog(" %d\n", __LINE__);
3906 #ifndef NO_packRegsForSupport
3907 /* reduce for support function calls */
3908 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3909 packRegsForSupport (ic, ebp);
3912 /* if a parameter is passed, it's in W, so we may not
3913 need to place a copy in a register */
3914 if (ic->op == RECEIVE)
3915 packForReceive (ic, ebp);
3917 #ifndef NO_packRegsForOneuse
3918 /* some cases the redundant moves can
3919 can be eliminated for return statements */
3920 if ((ic->op == RETURN || ic->op == SEND) &&
3921 !isOperandInFarSpace (IC_LEFT (ic)) &&
3923 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3926 #ifndef NO_packRegsForOneuse
3927 /* if pointer set & left has a size more than
3928 one and right is not in far space */
3929 if (POINTER_SET (ic) &&
3930 !isOperandInFarSpace (IC_RIGHT (ic)) &&
3931 !OP_SYMBOL (IC_RESULT (ic))->remat &&
3932 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3933 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3935 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3938 #ifndef NO_packRegsForOneuse
3939 /* if pointer get */
3940 if (POINTER_GET (ic) &&
3941 !isOperandInFarSpace (IC_RESULT (ic)) &&
3942 !OP_SYMBOL (IC_LEFT (ic))->remat &&
3943 !IS_OP_RUONLY (IC_RESULT (ic)) &&
3944 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3946 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3947 debugLog("%d - return from packRegsForOneuse\n", __LINE__);
3950 #ifndef NO_cast_peep
3951 /* if this is cast for intergral promotion then
3952 check if only use of the definition of the
3953 operand being casted/ if yes then replace
3954 the result of that arithmetic operation with
3955 this result and get rid of the cast */
3956 if (ic->op == CAST) {
3958 sym_link *fromType = operandType (IC_RIGHT (ic));
3959 sym_link *toType = operandType (IC_LEFT (ic));
3961 debugLog (" %d - casting\n", __LINE__);
3963 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3964 getSize (fromType) != getSize (toType)) {
3967 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3970 if (IS_ARITHMETIC_OP (dic)) {
3971 debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3973 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3974 IC_RESULT (dic) = IC_RESULT (ic);
3975 remiCodeFromeBBlock (ebp, ic);
3976 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3977 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3978 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3982 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3986 /* if the type from and type to are the same
3987 then if this is the only use then packit */
3988 if (compareType (operandType (IC_RIGHT (ic)),
3989 operandType (IC_LEFT (ic))) == 1) {
3991 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3994 debugLog(" %d\n", __LINE__);
3996 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3997 IC_RESULT (dic) = IC_RESULT (ic);
3998 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3999 remiCodeFromeBBlock (ebp, ic);
4000 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
4001 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
4009 iTempNN := (some variable in farspace) V1
4014 if (ic->op == IPUSH)
4016 packForPush (ic, ebp);
4020 #ifndef NO_packRegsForAccUse
4021 /* pack registers for accumulator use, when the
4022 result of an arithmetic or bit wise operation
4023 has only one use, that use is immediately following
4024 the defintion and the using iCode has only one
4025 operand or has two operands but one is literal &
4026 the result of that operation is not on stack then
4027 we can leave the result of this operation in acc:b
4029 if ((IS_ARITHMETIC_OP (ic)
4031 || IS_BITWISE_OP (ic)
4033 || ic->op == LEFT_OP || ic->op == RIGHT_OP
4036 IS_ITEMP (IC_RESULT (ic)) &&
4037 getSize (operandType (IC_RESULT (ic))) <= 1)
4039 packRegsForAccUse (ic);
4046 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4050 if (!pic16_ralloc_debug || !debugF)
4053 for (i = 0; i < count; i++)
4055 fprintf (debugF, "\n----------------------------------------------------------------\n");
4056 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4057 ebbs[i]->entryLabel->name,
4060 ebbs[i]->isLastInLoop);
4061 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4066 fprintf (debugF, "visited %d : hasFcall = %d\n",
4070 fprintf (debugF, "\ndefines bitVector :");
4071 bitVectDebugOn (ebbs[i]->defSet, debugF);
4072 fprintf (debugF, "\nlocal defines bitVector :");
4073 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4074 fprintf (debugF, "\npointers Set bitvector :");
4075 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4076 fprintf (debugF, "\nin pointers Set bitvector :");
4077 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4078 fprintf (debugF, "\ninDefs Set bitvector :");
4079 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4080 fprintf (debugF, "\noutDefs Set bitvector :");
4081 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4082 fprintf (debugF, "\nusesDefs Set bitvector :");
4083 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4084 fprintf (debugF, "\n----------------------------------------------------------------\n");
4085 printiCChain (ebbs[i]->sch, debugF);
4088 /*-----------------------------------------------------------------*/
4089 /* pic16_assignRegisters - assigns registers to each live range as need */
4090 /*-----------------------------------------------------------------*/
4092 pic16_assignRegisters (eBBlock ** ebbs, int count)
4097 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4098 debugLog ("\nebbs before optimizing:\n");
4099 dumpEbbsToDebug (ebbs, count);
4101 setToNull ((void *) &_G.funcrUsed);
4102 pic16_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4105 /* change assignments this will remove some
4106 live ranges reducing some register pressure */
4107 for (i = 0; i < count; i++)
4108 pic16_packRegisters (ebbs[i]);
4115 debugLog("dir registers allocated so far:\n");
4116 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4119 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4120 // fprintf(stderr, " -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4121 reg = hTabNextItem(dynDirectRegNames, &hkey);
4126 /* liveranges probably changed by register packing
4127 so we compute them again */
4128 recomputeLiveRanges (ebbs, count);
4130 if (options.dump_pack)
4131 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4133 /* first determine for each live range the number of
4134 registers & the type of registers required for each */
4137 /* and serially allocate registers */
4138 serialRegAssign (ebbs, count);
4140 // debugLog ("ebbs after serialRegAssign:\n");
4141 // dumpEbbsToDebug (ebbs, count);
4144 //pic16_freeAllRegs();
4146 /* if stack was extended then tell the user */
4149 /* werror(W_TOOMANY_SPILS,"stack", */
4150 /* _G.stackExtend,currFunc->name,""); */
4156 /* werror(W_TOOMANY_SPILS,"data space", */
4157 /* _G.dataExtend,currFunc->name,""); */
4161 /* after that create the register mask
4162 for each of the instruction */
4163 createRegMask (ebbs, count);
4165 /* redo that offsets for stacked automatic variables */
4166 redoStackOffsets ();
4168 if (options.dump_rassgn)
4169 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4171 /* now get back the chain */
4172 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4174 debugLog ("ebbs after optimizing:\n");
4175 dumpEbbsToDebug (ebbs, count);
4180 /* free up any _G.stackSpil locations allocated */
4181 applyToSet (_G.stackSpil, deallocStackSpil);
4183 setToNull ((void *) &_G.stackSpil);
4184 setToNull ((void *) &_G.spiltSet);
4185 /* mark all registers as free */
4186 pic16_freeAllRegs ();
4188 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");