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
41 #define debugf(frm, rest) _debugf(__FILE__, __LINE__, frm, rest)
43 void _debugf(char *f, int l, char *frm, ...);
45 #define NEWREG_DEBUG 0
49 /*-----------------------------------------------------------------*/
50 /* At this point we start getting processor specific although */
51 /* some routines are non-processor specific & can be reused when */
52 /* targetting other processors. The decision for this will have */
53 /* to be made on a routine by routine basis */
54 /* routines used to pack registers are most definitely not reusable */
55 /* since the pack the registers depending strictly on the MCU */
56 /*-----------------------------------------------------------------*/
58 regs *pic16_typeRegWithIdx (int idx, int type, int fixed);
59 extern void genpic16Code (iCode *);
69 bitVect *funcrUsed; /* registers used in a function */
75 /* Shared with gen.c */
76 int pic16_ptrRegReq; /* one byte pointer register required */
79 set *pic16_dynAllocRegs=NULL;
80 set *pic16_dynStackRegs=NULL;
81 set *pic16_dynProcessorRegs=NULL;
82 set *pic16_dynDirectRegs=NULL;
83 set *pic16_dynDirectBitRegs=NULL;
84 set *pic16_dynInternalRegs=NULL;
85 set *pic16_dynAccessRegs=NULL;
87 static hTab *dynDirectRegNames=NULL;
88 static hTab *dynAllocRegNames=NULL;
89 static hTab *dynProcRegNames=NULL;
90 static hTab *dynAccessRegNames=NULL;
91 //static hTab *regHash = NULL; /* a hash table containing ALL registers */
93 extern set *sectNames;
95 set *pic16_rel_udata=NULL; /* relocatable uninitialized registers */
96 set *pic16_fix_udata=NULL; /* absolute uninitialized registers */
97 set *pic16_equ_data=NULL; /* registers used by equates */
98 set *pic16_int_regs=NULL; /* internal registers placed in access bank 0 to 0x7f */
99 set *pic16_acs_udata=NULL; /* access bank variables */
101 set *pic16_builtin_functions=NULL;
103 static int dynrIdx=0x00; //0x20; // starting temporary register rIdx
104 static int rDirectIdx=0;
106 int pic16_nRegs = 128; // = sizeof (regspic16) / sizeof (regs);
108 int pic16_Gstack_base_addr=0; /* The starting address of registers that
109 * are used to pass and return parameters */
112 int _inRegAllocator=0; /* flag that marks whther allocReg happens while
113 * inside the register allocator function */
116 static void spillThis (symbol *);
117 int pic16_ralloc_debug = 0;
118 static FILE *debugF = NULL;
119 /*-----------------------------------------------------------------*/
120 /* debugLog - open a file for debugging information */
121 /*-----------------------------------------------------------------*/
122 //static void debugLog(char *inst,char *fmt, ...)
124 debugLog (char *fmt,...)
126 static int append = 0; // First time through, open the file without append.
129 //char *bufferP=buffer;
132 if (!pic16_ralloc_debug || !dstFileName)
138 /* create the file name */
139 strcpy (buffer, dstFileName);
140 strcat (buffer, ".d");
142 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
144 werror (E_FILE_OPEN_ERR, buffer);
147 append = 1; // Next time debubLog is called, we'll append the debug info
153 vsprintf (buffer, fmt, ap);
155 fprintf (debugF, "%s", buffer);
157 while (isspace(*bufferP)) bufferP++;
159 if (bufferP && *bufferP)
160 lineCurr = (lineCurr ?
161 connectLine(lineCurr,newLineNode(lb)) :
162 (lineHead = newLineNode(lb)));
163 lineCurr->isInline = _G.inLine;
164 lineCurr->isDebug = _G.debugLine;
173 if(!pic16_ralloc_debug)return;
176 fputc ('\n', debugF);
178 /*-----------------------------------------------------------------*/
179 /* debugLogClose - closes the debug log file (if opened) */
180 /*-----------------------------------------------------------------*/
190 #define AOP(op) op->aop
193 debugAopGet (char *str, operand * op)
195 if(!pic16_ralloc_debug)return NULL;
200 printOperand (op, debugF);
207 pic16_decodeOp (unsigned int op)
209 if (op < 128 && op > ' ') {
210 buffer[0] = (op & 0xff);
216 case IDENTIFIER: return "IDENTIFIER";
217 case TYPE_NAME: return "TYPE_NAME";
218 case CONSTANT: return "CONSTANT";
219 case STRING_LITERAL: return "STRING_LITERAL";
220 case SIZEOF: return "SIZEOF";
221 case PTR_OP: return "PTR_OP";
222 case INC_OP: return "INC_OP";
223 case DEC_OP: return "DEC_OP";
224 case LEFT_OP: return "LEFT_OP";
225 case RIGHT_OP: return "RIGHT_OP";
226 case LE_OP: return "LE_OP";
227 case GE_OP: return "GE_OP";
228 case EQ_OP: return "EQ_OP";
229 case NE_OP: return "NE_OP";
230 case AND_OP: return "AND_OP";
231 case OR_OP: return "OR_OP";
232 case MUL_ASSIGN: return "MUL_ASSIGN";
233 case DIV_ASSIGN: return "DIV_ASSIGN";
234 case MOD_ASSIGN: return "MOD_ASSIGN";
235 case ADD_ASSIGN: return "ADD_ASSIGN";
236 case SUB_ASSIGN: return "SUB_ASSIGN";
237 case LEFT_ASSIGN: return "LEFT_ASSIGN";
238 case RIGHT_ASSIGN: return "RIGHT_ASSIGN";
239 case AND_ASSIGN: return "AND_ASSIGN";
240 case XOR_ASSIGN: return "XOR_ASSIGN";
241 case OR_ASSIGN: return "OR_ASSIGN";
242 case TYPEDEF: return "TYPEDEF";
243 case EXTERN: return "EXTERN";
244 case STATIC: return "STATIC";
245 case AUTO: return "AUTO";
246 case REGISTER: return "REGISTER";
247 case CODE: return "CODE";
248 case EEPROM: return "EEPROM";
249 case INTERRUPT: return "INTERRUPT";
250 case SFR: return "SFR";
251 case AT: return "AT";
252 case SBIT: return "SBIT";
253 case REENTRANT: return "REENTRANT";
254 case USING: return "USING";
255 case XDATA: return "XDATA";
256 case DATA: return "DATA";
257 case IDATA: return "IDATA";
258 case PDATA: return "PDATA";
259 case VAR_ARGS: return "VAR_ARGS";
260 case CRITICAL: return "CRITICAL";
261 case NONBANKED: return "NONBANKED";
262 case BANKED: return "BANKED";
263 case CHAR: return "CHAR";
264 case SHORT: return "SHORT";
265 case INT: return "INT";
266 case LONG: return "LONG";
267 case SIGNED: return "SIGNED";
268 case UNSIGNED: return "UNSIGNED";
269 case FLOAT: return "FLOAT";
270 case DOUBLE: return "DOUBLE";
271 case CONST: return "CONST";
272 case VOLATILE: return "VOLATILE";
273 case VOID: return "VOID";
274 case BIT: return "BIT";
275 case STRUCT: return "STRUCT";
276 case UNION: return "UNION";
277 case ENUM: return "ENUM";
278 case ELIPSIS: return "ELIPSIS";
279 case RANGE: return "RANGE";
280 case FAR: return "FAR";
281 case CASE: return "CASE";
282 case DEFAULT: return "DEFAULT";
283 case IF: return "IF";
284 case ELSE: return "ELSE";
285 case SWITCH: return "SWITCH";
286 case WHILE: return "WHILE";
287 case DO: return "DO";
288 case FOR: return "FOR";
289 case GOTO: return "GOTO";
290 case CONTINUE: return "CONTINUE";
291 case BREAK: return "BREAK";
292 case RETURN: return "RETURN";
293 case INLINEASM: return "INLINEASM";
294 case IFX: return "IFX";
295 case ADDRESS_OF: return "ADDRESS_OF";
296 case GET_VALUE_AT_ADDRESS: return "GET_VALUE_AT_ADDRESS";
297 case SPIL: return "SPIL";
298 case UNSPIL: return "UNSPIL";
299 case GETHBIT: return "GETHBIT";
300 case BITWISEAND: return "BITWISEAND";
301 case UNARYMINUS: return "UNARYMINUS";
302 case IPUSH: return "IPUSH";
303 case IPOP: return "IPOP";
304 case PCALL: return "PCALL";
305 case ENDFUNCTION: return "ENDFUNCTION";
306 case JUMPTABLE: return "JUMPTABLE";
307 case RRC: return "RRC";
308 case RLC: return "RLC";
309 case CAST: return "CAST";
310 case CALL: return "CALL";
311 case PARAM: return "PARAM ";
312 case NULLOP: return "NULLOP";
313 case BLOCK: return "BLOCK";
314 case LABEL: return "LABEL";
315 case RECEIVE: return "RECEIVE";
316 case SEND: return "SEND";
318 sprintf (buffer, "unkown op %d %c", op, op & 0xff);
322 /*-----------------------------------------------------------------*/
323 /*-----------------------------------------------------------------*/
325 debugLogRegType (short type)
327 if(!pic16_ralloc_debug)return NULL;
329 case REG_GPR: return "REG_GPR";
330 case REG_PTR: return "REG_PTR";
331 case REG_CND: return "REG_CND";
333 sprintf (buffer, "unknown reg type %d", type);
338 /*-----------------------------------------------------------------*/
339 /*-----------------------------------------------------------------*/
340 static int regname2key(char const *name)
349 key += (*name++) + 1;
353 return ( (key + (key >> 4) + (key>>8)) & 0x3f);
357 /*-----------------------------------------------------------------*/
358 /* newReg - allocate and init memory for a new register */
359 /*-----------------------------------------------------------------*/
360 regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias, operand *refop)
365 dReg = Safe_calloc(1,sizeof(regs));
367 dReg->pc_type = pc_type;
370 dReg->name = Safe_strdup(name);
372 sprintf(buffer,"r0x%02X", dReg->rIdx);
375 dReg->name = Safe_strdup(buffer);
383 if(type == REG_SFR) {
385 dReg->address = rIdx;
386 dReg->accessBank = 1;
390 dReg->accessBank = 0;
394 fprintf(stderr,"newReg: %s, rIdx = 0x%02x\taccess= %d\tregop= %p\n",dReg->name,rIdx, dReg->accessBank, refop);
398 dReg->reg_alias = NULL;
399 dReg->reglives.usedpFlows = newSet();
400 dReg->reglives.assignedpFlows = newSet();
403 if(!(type == REG_SFR && alias == 0x80))
404 hTabAddItem(&dynDirectRegNames, regname2key(name), dReg);
409 /*-----------------------------------------------------------------*/
410 /* regWithIdx - Search through a set of registers that matches idx */
411 /*-----------------------------------------------------------------*/
413 regWithIdx (set *dRegs, int idx, unsigned fixed)
417 for (dReg = setFirstItem(dRegs) ; dReg ;
418 dReg = setNextItem(dRegs)) {
420 if(idx == dReg->rIdx && (fixed == dReg->isFixed)) {
428 /*-----------------------------------------------------------------*/
429 /* regFindFree - Search for a free register in a set of registers */
430 /*-----------------------------------------------------------------*/
432 regFindFree (set *dRegs)
436 for (dReg = setFirstItem(dRegs) ; dReg ;
437 dReg = setNextItem(dRegs)) {
439 // fprintf(stderr, "%s:%d checking register %s (%p) [rIdx: 0x%02x] if free= %d\n",
440 // __FILE__, __LINE__, dReg->name, dReg, dReg->rIdx, dReg->isFree);
449 /*-----------------------------------------------------------------*/
450 /* pic16_initStack - allocate registers for a pseudo stack */
451 /*-----------------------------------------------------------------*/
452 void pic16_initStack(int base_address, int size)
457 pic16_Gstack_base_addr = base_address;
458 //fprintf(stderr,"initStack");
460 for(i = 0; i<size; i++)
461 addSet(&pic16_dynStackRegs,newReg(REG_STK, PO_GPR_TEMP,base_address++,NULL,1,0, NULL));
464 /*-----------------------------------------------------------------*
465 *-----------------------------------------------------------------*/
467 pic16_allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
469 regs *reg = newReg(REG_SFR, po_type, rIdx, name, 1, alias, NULL);
471 // fprintf(stderr,"%s: %s addr =0x%x\n",__FUNCTION__, name,rIdx);
473 reg->wasUsed = 0; // we do not know if they are going to be used at all
474 reg->accessBank = 1; // implicit add access Bank
476 hTabAddItem(&dynProcRegNames, regname2key(reg->name), reg);
478 return addSet(&pic16_dynProcessorRegs, reg);
481 /*-----------------------------------------------------------------*
482 *-----------------------------------------------------------------*/
485 pic16_allocInternalRegister(int rIdx, char * name, short po_type, int alias)
487 regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias, NULL);
489 // fprintf(stderr,"%s:%d: %s %s addr =0x%x\n",__FILE__, __LINE__, __FUNCTION__, name, rIdx);
493 return addSet(&pic16_dynInternalRegs,reg);
500 /*-----------------------------------------------------------------*/
501 /* allocReg - allocates register of given type */
502 /*-----------------------------------------------------------------*/
504 allocReg (short type)
508 #define MAX_P16_NREGS 6
512 if(dynrIdx > pic16_nRegs)
516 /* try to reuse some unused registers */
517 reg = regFindFree( pic16_dynAllocRegs );
520 // fprintf(stderr, "%s: [%s] found FREE register %s, rIdx: %d\n", __FILE__, (_inRegAllocator)?"ralloc":"", reg->name, reg->rIdx);
524 reg = newReg(REG_GPR, PO_GPR_TEMP, dynrIdx++, NULL, 1, 0, NULL);
525 // fprintf(stderr, "%s: [%s] allocating NEW register %s, rIdx: %d\n", __FILE__, (_inRegAllocator)?"ralloc":"", reg->name, reg->rIdx);
528 if(_inRegAllocator && (dynrIdx > MAX_P16_NREGS)) {
529 // debugf("allocating more registers than available\n", 0);
534 // addSet(&pic16_dynAllocRegs, reg);
537 addSet(&pic16_dynAllocRegs, reg);
538 hTabAddItem(&dynAllocRegNames, regname2key(reg->name), reg);
542 debugLog ("%s of type %s for register rIdx: %d (0x%x)\n", __FUNCTION__, debugLogRegType (type), dynrIdx-1, dynrIdx-1);
545 fprintf(stderr,"%s:%d: %s\t%s addr= 0x%x\trIdx= 0x%02x isFree: %d\n",
546 __FILE__, __LINE__, __FUNCTION__, reg->name, reg->address, reg->rIdx, reg->isFree);
549 reg->accessBank = 1; /* this is a temporary register alloc in accessBank */
550 reg->isLocal = 1; /* this is a local frame register */
555 // fprintf(stderr, "%s:%d adding %s into function %s regsUsed\n", __FUNCTION__, __LINE__, reg->name, currFunc->name);
556 currFunc->regsUsed = bitVectSetBit (currFunc->regsUsed, reg->rIdx);
559 return (reg); // addSet(&pic16_dynAllocRegs,reg);
564 /*-----------------------------------------------------------------*/
565 /* pic16_dirregWithName - search for register by name */
566 /*-----------------------------------------------------------------*/
568 pic16_dirregWithName (char *name)
576 /* hash the name to get a key */
578 hkey = regname2key(name);
580 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
582 reg = hTabFirstItemWK(dynDirectRegNames, hkey);
586 if(STRCASECMP(reg->name, name) == 0) {
587 // fprintf(stderr, "%s:%d: FOUND name = %s\thash = %d\n", __FUNCTION__, __LINE__, reg->name, hkey);
591 reg = hTabNextItemWK (dynDirectRegNames);
595 return NULL; // name wasn't found in the hash table
598 /*-----------------------------------------------------------------*/
599 /* pic16_allocregWithName - search for register by name */
600 /*-----------------------------------------------------------------*/
602 pic16_allocregWithName (char *name)
610 /* hash the name to get a key */
612 hkey = regname2key(name);
614 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
616 reg = hTabFirstItemWK(dynAllocRegNames, hkey);
620 if(STRCASECMP(reg->name, name) == 0) {
624 reg = hTabNextItemWK (dynAllocRegNames);
628 return NULL; // name wasn't found in the hash table
633 /*-----------------------------------------------------------------*/
634 /* pic16_procregWithName - search for register by name */
635 /*-----------------------------------------------------------------*/
637 pic16_procregWithName (char *name)
645 /* hash the name to get a key */
647 hkey = regname2key(name);
649 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
651 reg = hTabFirstItemWK(dynProcRegNames, hkey);
655 if(STRCASECMP(reg->name, name) == 0) {
659 reg = hTabNextItemWK (dynProcRegNames);
663 return NULL; // name wasn't found in the hash table
667 /*-----------------------------------------------------------------*/
668 /* pic16_accessregWithName - search for register by name */
669 /*-----------------------------------------------------------------*/
671 pic16_accessregWithName (char *name)
679 /* hash the name to get a key */
681 hkey = regname2key(name);
683 // fprintf(stderr, "%s:%d: name = %s\thash = %d\n", __FUNCTION__, __LINE__, name, hkey);
685 reg = hTabFirstItemWK(dynAccessRegNames, hkey);
689 if(STRCASECMP(reg->name, name) == 0) {
693 reg = hTabNextItemWK (dynAccessRegNames);
697 return NULL; // name wasn't found in the hash table
701 regs *pic16_regWithName(char *name)
705 reg = pic16_dirregWithName( name );
708 reg = pic16_procregWithName( name );
711 reg = pic16_allocregWithName( name );
714 reg = pic16_accessregWithName( name );
721 /*-----------------------------------------------------------------*/
722 /* pic16_allocDirReg - allocates register of given type */
723 /*-----------------------------------------------------------------*/
725 pic16_allocDirReg (operand *op )
731 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
732 // fprintf(stderr, "%s BAD, op is NULL\n", __FUNCTION__);
736 name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
739 if(!SPEC_OCLS( OP_SYM_ETYPE(op))) {
741 if(pic16_debug_verbose)
743 fprintf(stderr, "%s:%d symbol %s(r:%s) is not assigned to a memmap\n", __FILE__, __LINE__,
744 OP_SYMBOL(op)->name, OP_SYMBOL(op)->rname);
750 if(!IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))
751 || !IN_FARSPACE(SPEC_OCLS( OP_SYM_ETYPE(op))) ) {
754 if(pic16_debug_verbose) {
755 fprintf(stderr, "dispace:%d farspace:%d codespace:%d regspace:%d stack:%d eeprom: %d regparm: %d isparm: %d\n",
756 IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
757 IN_FARSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
758 IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
759 IN_REGSP( SPEC_OCLS( OP_SYM_ETYPE(op))),
760 IN_STACK( OP_SYM_ETYPE(op)),
761 SPEC_OCLS(OP_SYM_ETYPE(op)) == eeprom,
762 IS_REGPARM(OP_SYM_ETYPE(op)),
765 fprintf(stderr, "%s:%d symbol %s NOT in dirspace\n", __FILE__, __LINE__,
766 OP_SYMBOL(op)->name);
774 if (IS_CODE ( OP_SYM_ETYPE(op)) ) {
775 // fprintf(stderr, "%s:%d sym: %s in codespace\n", __FUNCTION__, __LINE__, OP_SYMBOL(op)->name);
779 if(IS_ITEMP(op))return NULL;
781 // if(IS_STATIC(OP_SYM_ETYPE(op)))return NULL;
783 if(IN_STACK(OP_SYM_ETYPE(op)))return NULL;
785 debugLog ("%s:%d symbol name %s\n", __FUNCTION__, __LINE__, name);
786 // fprintf(stderr, "%s symbol name %s\tSTATIC:%d\n", __FUNCTION__,name, IS_STATIC(OP_SYM_ETYPE(op)));
789 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
790 debugLog(" %d const char\n",__LINE__);
791 debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
792 // fprintf(stderr, " %d const char\n",__LINE__);
793 // fprintf(stderr, " value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
797 debugLog(" %d storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
798 if (IS_CODE ( OP_SYM_ETYPE(op)) )
799 debugLog(" %d code space\n",__LINE__);
801 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
802 debugLog(" %d integral\n",__LINE__);
804 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
805 debugLog(" %d literal\n",__LINE__);
807 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
808 debugLog(" %d specifier\n",__LINE__);
810 debugAopGet(NULL, op);
814 reg = pic16_dirregWithName(name);
818 int regtype = REG_GPR;
820 /* if this is at an absolute address, then get the address. */
821 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
822 address = SPEC_ADDR ( OP_SYM_ETYPE(op));
823 // fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
826 /* Register wasn't found in hash, so let's create
827 * a new one and put it in the hash table AND in the
828 * dynDirectRegNames set */
829 if(IS_CODE(OP_SYM_ETYPE(op)) || IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))) {
830 debugLog("%s:%d sym: %s in codespace\n", __FUNCTION__, __LINE__, OP_SYMBOL(op)->name);
836 if(OP_SYMBOL(op)->onStack) {
837 fprintf(stderr, "%s:%d onStack %s offset: %d\n", __FILE__, __LINE__,
838 OP_SYMBOL(op)->name, OP_SYMBOL(op)->stack);
842 if(!IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op)))
843 || !IN_FARSPACE(SPEC_OCLS( OP_SYM_ETYPE(op))) ) {
846 if(pic16_debug_verbose)
848 fprintf(stderr, "dispace:%d farspace:%d codespace:%d regspace:%d stack:%d eeprom: %d\n",
849 IN_DIRSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
850 IN_FARSPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
851 IN_CODESPACE( SPEC_OCLS( OP_SYM_ETYPE(op))),
852 IN_REGSP( SPEC_OCLS( OP_SYM_ETYPE(op))),
853 IN_STACK( OP_SYM_ETYPE(op)),
854 SPEC_OCLS(OP_SYM_ETYPE(op)) == eeprom);
856 fprintf(stderr, "%s:%d symbol %s NOT in dirspace\n", __FILE__, __LINE__,
857 OP_SYMBOL(op)->name);
862 reg = newReg(regtype, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0, op);
863 debugLog ("%d -- added %s to hash, size = %d\n", __LINE__, name,reg->size);
865 if( SPEC_SCLS( OP_SYM_ETYPE( op ) ) == S_REGISTER ) {
866 fprintf(stderr, "%s:%d symbol %s is declared as register\n", __FILE__, __LINE__,
870 checkAddReg(&pic16_dynAccessRegs, reg);
871 hTabAddItem(&dynAccessRegNames, regname2key(name), reg);
877 // if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
878 // fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
879 // reg->type = REG_SFR;
882 if (IS_BITVAR (OP_SYM_ETYPE(op))) {
883 // fprintf(stderr, "%s:%d adding %s in bit registers\n", __FILE__, __LINE__, reg->name);
884 addSet(&pic16_dynDirectBitRegs, reg);
887 // fprintf(stderr, "%s:%d adding %s in direct registers\n", __FILE__, __LINE__, reg->name);
888 // addSet(&pic16_dynDirectRegs, reg);
891 if(!(IS_STATIC(OP_SYM_ETYPE(op))
892 && OP_SYMBOL(op)->ival
895 checkAddReg(&pic16_dynDirectRegs, reg);
899 // debugLog (" -- %s is declared at address 0x30000x\n",name);
900 return (reg); /* This was NULL before, but since we found it
901 * why not just return it?! */
904 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
906 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
908 /* work around for user defined registers in access bank */
909 if((reg->address>= 0x00 && reg->address < 0x80)
910 || (reg->address >= 0xf80 && reg->address <= 0xfff))
913 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
919 /*-----------------------------------------------------------------*/
920 /* pic16_allocRegByName - allocates register of given type */
921 /*-----------------------------------------------------------------*/
923 pic16_allocRegByName (char *name, int size, operand *op)
929 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
933 /* First, search the hash table to see if there is a register with this name */
934 reg = pic16_dirregWithName(name);
938 /* Register wasn't found in hash, so let's create
939 * a new one and put it in the hash table AND in the
940 * dynDirectRegNames set */
942 fprintf (stderr,"%s:%d symbol name %s\tregop= %p\n", __FUNCTION__, __LINE__, name, op);
944 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0, op);
946 debugLog ("%d -- added %s to hash, size = %d\n", __LINE__, name,reg->size);
947 //fprintf(stderr, " -- added %s to hash, size = %d\n", name,reg->size);
949 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg); /* initially commented out */
950 addSet(&pic16_dynDirectRegs, reg);
956 /*-----------------------------------------------------------------*/
957 /* RegWithIdx - returns pointer to register with index number */
958 /*-----------------------------------------------------------------*/
959 regs *pic16_typeRegWithIdx (int idx, int type, int fixed)
964 debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
965 // fprintf(stderr, "%s - requesting index = 0x%x\n", __FUNCTION__, idx);
970 if( (dReg = regWithIdx ( pic16_dynAllocRegs, idx, fixed)) != NULL) {
972 debugLog ("Found a Dynamic Register!\n");
975 if( (dReg = regWithIdx ( pic16_dynDirectRegs, idx, fixed)) != NULL ) {
976 debugLog ("Found a Direct Register!\n");
982 if( (dReg = regWithIdx ( pic16_dynStackRegs, idx, fixed)) != NULL ) {
983 debugLog ("Found a Stack Register!\n");
988 if( (dReg = regWithIdx ( pic16_dynProcessorRegs, idx, 1)) != NULL ) {
989 debugLog ("Found a Processor Register!\n");
1003 /*-----------------------------------------------------------------*/
1004 /* pic16_regWithIdx - returns pointer to register with index number*/
1005 /*-----------------------------------------------------------------*/
1007 pic16_regWithIdx (int idx)
1011 if( (dReg = pic16_typeRegWithIdx(idx,REG_GPR,0)) != NULL)
1014 if( (dReg = pic16_typeRegWithIdx(idx,REG_SFR,0)) != NULL)
1018 if( (dReg = pic16_typeRegWithIdx(idx,REG_STK,0)) != NULL)
1025 /*-----------------------------------------------------------------*/
1026 /* pic16_regWithIdx - returns pointer to register with index number */
1027 /*-----------------------------------------------------------------*/
1029 pic16_allocWithIdx (int idx)
1034 debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
1035 // fprintf(stderr, "%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
1037 if( (dReg = regWithIdx ( pic16_dynAllocRegs, idx,0)) != NULL) {
1039 debugLog ("Found a Dynamic Register!\n");
1040 } else if( (dReg = regWithIdx ( pic16_dynStackRegs, idx,0)) != NULL ) {
1041 debugLog ("Found a Stack Register!\n");
1042 } else if( (dReg = regWithIdx ( pic16_dynProcessorRegs, idx,1)) != NULL ) {
1043 debugLog ("Found a Processor Register!\n");
1044 fprintf(stderr, "Found a processor register! %s\n", dReg->name);
1045 } else if( (dReg = regWithIdx ( pic16_dynInternalRegs, idx,0)) != NULL ) {
1046 debugLog ("Found an Internal Register!\n");
1049 debugLog ("Dynamic Register not found\n");
1052 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
1053 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1054 "regWithIdx not found");
1064 /*-----------------------------------------------------------------*/
1065 /*-----------------------------------------------------------------*/
1067 pic16_findFreeReg(short type)
1074 if((dReg = regFindFree(pic16_dynAllocRegs)) != NULL)
1076 return allocReg( REG_GPR ); //addSet(&pic16_dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0, NULL));
1080 if((dReg = regFindFree(pic16_dynStackRegs)) != NULL)
1092 /*-----------------------------------------------------------------*/
1093 /* freeReg - frees a register */
1094 /*-----------------------------------------------------------------*/
1096 freeReg (regs * reg)
1098 debugLog ("%s\n", __FUNCTION__);
1099 // fprintf(stderr, "%s:%d register %s (%p) is freed\n", __FILE__, __LINE__, reg->name, reg);
1104 /*-----------------------------------------------------------------*/
1105 /* nFreeRegs - returns number of free registers */
1106 /*-----------------------------------------------------------------*/
1108 nFreeRegs (int type)
1114 /* although I fixed the register allocation/freeing scheme
1115 * the for loop below doesn't give valid results. I do not
1116 * know why yet. -- VR 10-Jan-2003 */
1121 /* dynamically allocate as many as we need and worry about
1122 * fitting them into a PIC later */
1124 debugLog ("%s\n", __FUNCTION__);
1126 for(reg = setFirstItem(pic16_dynAllocRegs); reg; reg=setNextItem(pic16_dynAllocRegs))
1127 if((reg->type == type) && reg->isFree)nfr++;
1129 fprintf(stderr, "%s:%d # of free registers= %d\n", __FILE__, __LINE__, nfr);
1133 /*-----------------------------------------------------------------*/
1134 /* nfreeRegsType - free registers with type */
1135 /*-----------------------------------------------------------------*/
1137 nfreeRegsType (int type)
1140 debugLog ("%s\n", __FUNCTION__);
1141 if (type == REG_PTR)
1143 if ((nfr = nFreeRegs (type)) == 0)
1144 return nFreeRegs (REG_GPR);
1147 return nFreeRegs (type);
1150 static void writeSetUsedRegs(FILE *of, set *dRegs)
1155 for (dReg = setFirstItem(dRegs) ; dReg ;
1156 dReg = setNextItem(dRegs)) {
1159 fprintf (of, "\t%s\n",dReg->name);
1165 extern void pic16_groupRegistersInSection(set *regset);
1167 extern void pic16_dump_equates(FILE *of, set *equs);
1168 extern void pic16_dump_access(FILE *of, set *section);
1169 //extern void pic16_dump_map(void);
1170 extern void pic16_dump_usection(FILE *of, set *section, int fix);
1171 extern void pic16_dump_isection(FILE *of, set *section, int fix);
1172 extern void pic16_dump_int_registers(FILE *of, set *section);
1173 extern void pic16_dump_idata(FILE *of, set *idataSymSet);
1175 extern void pic16_dump_gsection(FILE *of, set *sections);
1177 static void packBits(set *bregs)
1181 regs *bitfield=NULL;
1182 regs *relocbitfield=NULL;
1188 for (regset = bregs ; regset ;
1189 regset = regset->next) {
1191 breg = regset->item;
1192 breg->isBitField = 1;
1193 //fprintf(stderr,"bit reg: %s\n",breg->name);
1196 //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
1198 bitfield = pic16_typeRegWithIdx (breg->address >> 3, -1 , 1);
1199 breg->rIdx = breg->address & 7;
1200 breg->address >>= 3;
1203 sprintf (buffer, "fbitfield%02x", breg->address);
1204 //fprintf(stderr,"new bit field\n");
1205 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0, NULL);
1206 bitfield->isBitField = 1;
1207 bitfield->isFixed = 1;
1208 bitfield->address = breg->address;
1209 addSet(&pic16_dynDirectRegs,bitfield);
1210 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
1212 //fprintf(stderr," which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
1215 breg->reg_alias = bitfield;
1219 if(!relocbitfield || bit_no >7) {
1222 sprintf (buffer, "bitfield%d", byte_no);
1223 //fprintf(stderr,"new relocatable bit field\n");
1224 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0, NULL);
1225 relocbitfield->isBitField = 1;
1226 addSet(&pic16_dynDirectRegs,relocbitfield);
1227 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1231 breg->reg_alias = relocbitfield;
1232 breg->address = rDirectIdx; /* byte_no; */
1233 breg->rIdx = bit_no++;
1239 void pic16_writeUsedRegs(FILE *of)
1241 packBits(pic16_dynDirectBitRegs);
1243 // fprintf(stderr, "%s: pic16_dynAllocRegs\n", __FUNCTION__);
1244 pic16_groupRegistersInSection(pic16_dynAllocRegs);
1246 // fprintf(stderr, "%s: pic16_dynInternalRegs\n", __FUNCTION__);
1247 pic16_groupRegistersInSection(pic16_dynInternalRegs);
1249 // fprintf(stderr, "%s: pic16_dynStackRegs\n", __FUNCTION__);
1250 pic16_groupRegistersInSection(pic16_dynStackRegs);
1252 // fprintf(stderr, "%s: pic16_dynDirectRegs\n", __FUNCTION__);
1253 pic16_groupRegistersInSection(pic16_dynDirectRegs);
1255 // fprintf(stderr, "%s: pic16_dynDirectBitsRegs\n", __FUNCTION__);
1256 pic16_groupRegistersInSection(pic16_dynDirectBitRegs);
1258 // fprintf(stderr, "%s: pic16_dynProcessorRegs\n", __FUNCTION__);
1259 pic16_groupRegistersInSection(pic16_dynProcessorRegs);
1261 // fprintf(stderr, "%s: pic16_dynAccessRegs\n", __FUNCTION__);
1262 pic16_groupRegistersInSection(pic16_dynAccessRegs);
1265 pic16_dump_equates(of, pic16_equ_data);
1267 // pic16_dump_esection(of, pic16_rel_eedata, 0);
1268 // pic16_dump_esection(of, pic16_fix_eedata, 0);
1270 /* dump access bank symbols */
1271 pic16_dump_access(of, pic16_acs_udata);
1273 /* dump initialised data */
1274 pic16_dump_isection(of, rel_idataSymSet, 0);
1275 pic16_dump_isection(of, fix_idataSymSet, 1);
1277 /* dump internal registers */
1278 pic16_dump_int_registers(of, pic16_int_regs);
1280 /* dump generic section variables */
1281 pic16_dump_gsection(of, sectNames);
1283 /* dump other variables */
1284 pic16_dump_usection(of, pic16_rel_udata, 0);
1285 pic16_dump_usection(of, pic16_fix_udata, 1);
1290 /*-----------------------------------------------------------------*/
1291 /* computeSpillable - given a point find the spillable live ranges */
1292 /*-----------------------------------------------------------------*/
1294 computeSpillable (iCode * ic)
1298 debugLog ("%s\n", __FUNCTION__);
1299 /* spillable live ranges are those that are live at this
1300 point . the following categories need to be subtracted
1302 a) - those that are already spilt
1303 b) - if being used by this one
1304 c) - defined by this one */
1306 spillable = bitVectCopy (ic->rlive);
1308 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1310 bitVectCplAnd (spillable, ic->uses); /* used in this one */
1311 bitVectUnSetBit (spillable, ic->defKey);
1312 spillable = bitVectIntersect (spillable, _G.regAssigned);
1317 /*-----------------------------------------------------------------*/
1318 /* noSpilLoc - return true if a variable has no spil location */
1319 /*-----------------------------------------------------------------*/
1321 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1323 debugLog ("%s\n", __FUNCTION__);
1324 return (sym->usl.spillLoc ? 0 : 1);
1327 /*-----------------------------------------------------------------*/
1328 /* hasSpilLoc - will return 1 if the symbol has spil location */
1329 /*-----------------------------------------------------------------*/
1331 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1333 debugLog ("%s\n", __FUNCTION__);
1334 return (sym->usl.spillLoc ? 1 : 0);
1337 /*-----------------------------------------------------------------*/
1338 /* directSpilLoc - will return 1 if the splilocation is in direct */
1339 /*-----------------------------------------------------------------*/
1341 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1343 debugLog ("%s\n", __FUNCTION__);
1344 if (sym->usl.spillLoc &&
1345 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1351 /*-----------------------------------------------------------------*/
1352 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1353 /* but is not used as a pointer */
1354 /*-----------------------------------------------------------------*/
1356 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1358 debugLog ("%s\n", __FUNCTION__);
1359 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1362 /*-----------------------------------------------------------------*/
1363 /* rematable - will return 1 if the remat flag is set */
1364 /*-----------------------------------------------------------------*/
1366 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1368 debugLog ("%s\n", __FUNCTION__);
1372 /*-----------------------------------------------------------------*/
1373 /* notUsedInRemaining - not used or defined in remain of the block */
1374 /*-----------------------------------------------------------------*/
1376 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1378 debugLog ("%s\n", __FUNCTION__);
1379 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1380 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1383 /*-----------------------------------------------------------------*/
1384 /* allLRs - return true for all */
1385 /*-----------------------------------------------------------------*/
1387 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1389 debugLog ("%s\n", __FUNCTION__);
1393 /*-----------------------------------------------------------------*/
1394 /* liveRangesWith - applies function to a given set of live range */
1395 /*-----------------------------------------------------------------*/
1397 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1398 eBBlock * ebp, iCode * ic)
1403 debugLog ("%s\n", __FUNCTION__);
1404 if (!lrs || !lrs->size)
1407 for (i = 1; i < lrs->size; i++)
1410 if (!bitVectBitValue (lrs, i))
1413 /* if we don't find it in the live range
1414 hash table we are in serious trouble */
1415 if (!(sym = hTabItemWithKey (liveRanges, i)))
1417 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1418 "liveRangesWith could not find liveRange");
1422 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1423 addSetHead (&rset, sym);
1430 /*-----------------------------------------------------------------*/
1431 /* leastUsedLR - given a set determines which is the least used */
1432 /*-----------------------------------------------------------------*/
1434 leastUsedLR (set * sset)
1436 symbol *sym = NULL, *lsym = NULL;
1438 debugLog ("%s\n", __FUNCTION__);
1439 sym = lsym = setFirstItem (sset);
1444 for (; lsym; lsym = setNextItem (sset))
1447 /* if usage is the same then prefer
1448 the spill the smaller of the two */
1449 if (lsym->used == sym->used)
1450 if (getSize (lsym->type) < getSize (sym->type))
1454 if (lsym->used < sym->used)
1459 setToNull ((void *) &sset);
1464 /*-----------------------------------------------------------------*/
1465 /* noOverLap - will iterate through the list looking for over lap */
1466 /*-----------------------------------------------------------------*/
1468 noOverLap (set * itmpStack, symbol * fsym)
1471 debugLog ("%s\n", __FUNCTION__);
1474 for (sym = setFirstItem (itmpStack); sym;
1475 sym = setNextItem (itmpStack))
1477 if (sym->liveTo > fsym->liveFrom)
1485 /*-----------------------------------------------------------------*/
1486 /* isFree - will return 1 if the a free spil location is found */
1487 /*-----------------------------------------------------------------*/
1492 V_ARG (symbol **, sloc);
1493 V_ARG (symbol *, fsym);
1495 debugLog ("%s\n", __FUNCTION__);
1496 /* if already found */
1500 /* if it is free && and the itmp assigned to
1501 this does not have any overlapping live ranges
1502 with the one currently being assigned and
1503 the size can be accomodated */
1505 noOverLap (sym->usl.itmpStack, fsym) &&
1506 getSize (sym->type) >= getSize (fsym->type))
1515 /*-----------------------------------------------------------------*/
1516 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
1517 /*-----------------------------------------------------------------*/
1519 spillLRWithPtrReg (symbol * forSym)
1525 debugLog ("%s\n", __FUNCTION__);
1526 if (!_G.regAssigned ||
1527 bitVectIsZero (_G.regAssigned))
1530 r0 = pic16_regWithIdx (R0_IDX);
1531 r1 = pic16_regWithIdx (R1_IDX);
1533 /* for all live ranges */
1534 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1535 lrsym = hTabNextItem (liveRanges, &k))
1539 /* if no registers assigned to it or
1541 /* if it does not overlap with this then
1542 not need to spill it */
1544 if (lrsym->isspilt || !lrsym->nRegs ||
1545 (lrsym->liveTo < forSym->liveFrom))
1548 /* go thru the registers : if it is either
1549 r0 or r1 then spil it */
1550 for (j = 0; j < lrsym->nRegs; j++)
1551 if (lrsym->regs[j] == r0 ||
1552 lrsym->regs[j] == r1)
1561 /*-----------------------------------------------------------------*/
1562 /* createStackSpil - create a location on the stack to spil */
1563 /*-----------------------------------------------------------------*/
1565 createStackSpil (symbol * sym)
1567 symbol *sloc = NULL;
1568 int useXstack, model, noOverlay;
1570 char slocBuffer[30];
1571 debugLog ("%s\n", __FUNCTION__);
1573 /* first go try and find a free one that is already
1574 existing on the stack */
1575 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1577 /* found a free one : just update & return */
1578 sym->usl.spillLoc = sloc;
1581 addSetHead (&sloc->usl.itmpStack, sym);
1585 /* could not then have to create one , this is the hard part
1586 we need to allocate this on the stack : this is really a
1587 hack!! but cannot think of anything better at this time */
1589 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1591 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1592 __FILE__, __LINE__);
1596 sloc = newiTemp (slocBuffer);
1598 /* set the type to the spilling symbol */
1599 sloc->type = copyLinkChain (sym->type);
1600 sloc->etype = getSpec (sloc->type);
1601 SPEC_SCLS (sloc->etype) = S_DATA;
1602 SPEC_EXTR (sloc->etype) = 0;
1603 SPEC_STAT (sloc->etype) = 0;
1605 /* we don't allow it to be allocated`
1606 onto the external stack since : so we
1607 temporarily turn it off ; we also
1608 turn off memory model to prevent
1609 the spil from going to the external storage
1610 and turn off overlaying
1613 useXstack = options.useXstack;
1614 model = options.model;
1615 noOverlay = options.noOverlay;
1616 options.noOverlay = 1;
1617 options.model = options.useXstack = 0;
1621 options.useXstack = useXstack;
1622 options.model = model;
1623 options.noOverlay = noOverlay;
1624 sloc->isref = 1; /* to prevent compiler warning */
1626 /* if it is on the stack then update the stack */
1627 if (IN_STACK (sloc->etype))
1629 currFunc->stack += getSize (sloc->type);
1630 _G.stackExtend += getSize (sloc->type);
1633 _G.dataExtend += getSize (sloc->type);
1635 /* add it to the _G.stackSpil set */
1636 addSetHead (&_G.stackSpil, sloc);
1637 sym->usl.spillLoc = sloc;
1640 /* add it to the set of itempStack set
1641 of the spill location */
1642 addSetHead (&sloc->usl.itmpStack, sym);
1646 /*-----------------------------------------------------------------*/
1647 /* isSpiltOnStack - returns true if the spil location is on stack */
1648 /*-----------------------------------------------------------------*/
1650 isSpiltOnStack (symbol * sym)
1654 debugLog ("%s\n", __FUNCTION__);
1661 /* if (sym->_G.stackSpil) */
1664 if (!sym->usl.spillLoc)
1667 etype = getSpec (sym->usl.spillLoc->type);
1668 if (IN_STACK (etype))
1674 /*-----------------------------------------------------------------*/
1675 /* spillThis - spils a specific operand */
1676 /*-----------------------------------------------------------------*/
1678 spillThis (symbol * sym)
1681 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1683 /* if this is rematerializable or has a spillLocation
1684 we are okay, else we need to create a spillLocation
1686 if (!(sym->remat || sym->usl.spillLoc))
1687 createStackSpil (sym);
1690 /* mark it has spilt & put it in the spilt set */
1692 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1694 bitVectUnSetBit (_G.regAssigned, sym->key);
1696 for (i = 0; i < sym->nRegs; i++)
1700 freeReg (sym->regs[i]);
1701 sym->regs[i] = NULL;
1704 /* if spilt on stack then free up r0 & r1
1705 if they could have been assigned to some
1707 if (!pic16_ptrRegReq && isSpiltOnStack (sym))
1710 spillLRWithPtrReg (sym);
1713 if (sym->usl.spillLoc && !sym->remat)
1714 sym->usl.spillLoc->allocreq = 1;
1718 /*-----------------------------------------------------------------*/
1719 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1720 /*-----------------------------------------------------------------*/
1722 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1724 bitVect *lrcs = NULL;
1728 debugLog ("%s\n", __FUNCTION__);
1729 /* get the spillable live ranges */
1730 lrcs = computeSpillable (ic);
1732 /* get all live ranges that are rematerizable */
1733 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1736 /* return the least used of these */
1737 return leastUsedLR (selectS);
1740 /* get live ranges with spillLocations in direct space */
1741 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1743 sym = leastUsedLR (selectS);
1744 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1745 sym->usl.spillLoc->rname :
1746 sym->usl.spillLoc->name));
1748 /* mark it as allocation required */
1749 sym->usl.spillLoc->allocreq = 1;
1753 /* if the symbol is local to the block then */
1754 if (forSym->liveTo < ebp->lSeq)
1757 /* check if there are any live ranges allocated
1758 to registers that are not used in this block */
1759 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1761 sym = leastUsedLR (selectS);
1762 /* if this is not rematerializable */
1771 /* check if there are any live ranges that not
1772 used in the remainder of the block */
1773 if (!_G.blockSpil &&
1774 !isiCodeInFunctionCall (ic) &&
1775 (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1777 sym = leastUsedLR (selectS);
1780 sym->remainSpil = 1;
1787 /* find live ranges with spillocation && not used as pointers */
1788 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1791 sym = leastUsedLR (selectS);
1792 /* mark this as allocation required */
1793 sym->usl.spillLoc->allocreq = 1;
1797 /* find live ranges with spillocation */
1798 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1801 sym = leastUsedLR (selectS);
1802 sym->usl.spillLoc->allocreq = 1;
1806 /* couldn't find then we need to create a spil
1807 location on the stack , for which one? the least
1809 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1812 /* return a created spil location */
1813 sym = createStackSpil (leastUsedLR (selectS));
1814 sym->usl.spillLoc->allocreq = 1;
1818 /* this is an extreme situation we will spill
1819 this one : happens very rarely but it does happen */
1825 /*-----------------------------------------------------------------*/
1826 /* spilSomething - spil some variable & mark registers as free */
1827 /*-----------------------------------------------------------------*/
1829 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1834 debugLog ("%s\n", __FUNCTION__);
1835 /* get something we can spil */
1836 ssym = selectSpil (ic, ebp, forSym);
1838 /* mark it as spilt */
1840 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1842 /* mark it as not register assigned &
1843 take it away from the set */
1844 bitVectUnSetBit (_G.regAssigned, ssym->key);
1846 /* mark the registers as free */
1847 for (i = 0; i < ssym->nRegs; i++)
1849 freeReg (ssym->regs[i]);
1851 /* if spilt on stack then free up r0 & r1
1852 if they could have been assigned to as gprs */
1853 if (!pic16_ptrRegReq && isSpiltOnStack (ssym))
1856 spillLRWithPtrReg (ssym);
1859 /* if this was a block level spil then insert push & pop
1860 at the start & end of block respectively */
1861 if (ssym->blockSpil)
1863 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1864 /* add push to the start of the block */
1865 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1866 ebp->sch->next : ebp->sch));
1867 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1868 /* add pop to the end of the block */
1869 addiCodeToeBBlock (ebp, nic, NULL);
1872 /* if spilt because not used in the remainder of the
1873 block then add a push before this instruction and
1874 a pop at the end of the block */
1875 if (ssym->remainSpil)
1878 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1879 /* add push just before this instruction */
1880 addiCodeToeBBlock (ebp, nic, ic);
1882 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1883 /* add pop to the end of the block */
1884 addiCodeToeBBlock (ebp, nic, NULL);
1893 /*-----------------------------------------------------------------*/
1894 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1895 /*-----------------------------------------------------------------*/
1897 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1902 debugLog ("%s\n", __FUNCTION__);
1904 /* try for a ptr type */
1905 if ((reg = allocReg (REG_PTR)))
1908 /* try for gpr type */
1909 if ((reg = allocReg (REG_GPR)))
1912 /* we have to spil */
1913 if (!spilSomething (ic, ebp, sym))
1916 /* make sure partially assigned registers aren't reused */
1917 for (j=0; j<=sym->nRegs; j++)
1919 sym->regs[j]->isFree = 0;
1921 /* this looks like an infinite loop but
1922 in really selectSpil will abort */
1926 /*-----------------------------------------------------------------*/
1927 /* getRegGpr - will try for GPR if not spil */
1928 /*-----------------------------------------------------------------*/
1930 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1935 debugLog ("%s\n", __FUNCTION__);
1937 /* try for gpr type */
1938 if ((reg = allocReg (REG_GPR)))
1941 if (!pic16_ptrRegReq)
1942 if ((reg = allocReg (REG_PTR)))
1945 /* we have to spil */
1946 if (!spilSomething (ic, ebp, sym))
1949 /* make sure partially assigned registers aren't reused */
1950 for (j=0; j<=sym->nRegs; j++)
1952 sym->regs[j]->isFree = 0;
1954 /* this looks like an infinite loop but
1955 in really selectSpil will abort */
1959 /*-----------------------------------------------------------------*/
1960 /* symHasReg - symbol has a given register */
1961 /*-----------------------------------------------------------------*/
1963 symHasReg (symbol * sym, regs * reg)
1967 debugLog ("%s\n", __FUNCTION__);
1968 for (i = 0; i < sym->nRegs; i++)
1969 if (sym->regs[i] == reg)
1975 /*-----------------------------------------------------------------*/
1976 /* deassignLRs - check the live to and if they have registers & are */
1977 /* not spilt then free up the registers */
1978 /*-----------------------------------------------------------------*/
1980 deassignLRs (iCode * ic, eBBlock * ebp)
1986 debugLog ("%s\n", __FUNCTION__);
1987 for (sym = hTabFirstItem (liveRanges, &k); sym;
1988 sym = hTabNextItem (liveRanges, &k))
1991 symbol *psym = NULL;
1992 /* if it does not end here */
1993 if (sym->liveTo > ic->seq)
1996 /* if it was spilt on stack then we can
1997 mark the stack spil location as free */
2002 sym->usl.spillLoc->isFree = 1;
2008 if (!bitVectBitValue (_G.regAssigned, sym->key))
2011 /* special case for shifting: there is a case where shift count
2012 * can be allocated in the same register as the result, so do not
2013 * free right registers if same as result registers, cause genShiftLeft
2014 * will fail -- VR */
2015 if(ic->op == LEFT_OP)
2018 /* special case check if this is an IFX &
2019 the privious one was a pop and the
2020 previous one was not spilt then keep track
2022 if (ic->op == IFX && ic->prev &&
2023 ic->prev->op == IPOP &&
2024 !ic->prev->parmPush &&
2025 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
2026 psym = OP_SYMBOL (IC_LEFT (ic->prev));
2032 bitVectUnSetBit (_G.regAssigned, sym->key);
2034 /* if the result of this one needs registers
2035 and does not have it then assign it right
2037 if (IC_RESULT (ic) &&
2038 !(SKIP_IC2 (ic) || /* not a special icode */
2039 ic->op == JUMPTABLE ||
2044 POINTER_SET (ic)) &&
2045 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
2046 result->liveTo > ic->seq && /* and will live beyond this */
2047 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
2048 result->liveFrom == ic->seq && /* does not start before here */
2049 result->regType == sym->regType && /* same register types */
2050 result->nRegs && /* which needs registers */
2051 !result->isspilt && /* and does not already have them */
2053 !bitVectBitValue (_G.regAssigned, result->key) &&
2054 /* the number of free regs + number of regs in this LR
2055 can accomodate the what result Needs */
2056 ((nfreeRegsType (result->regType) +
2057 sym->nRegs) >= result->nRegs)
2061 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2063 result->regs[i] = sym->regs[i];
2065 result->regs[i] = getRegGpr (ic, ebp, result);
2067 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2071 /* free the remaining */
2072 for (; i < sym->nRegs; i++)
2076 if (!symHasReg (psym, sym->regs[i]))
2077 freeReg (sym->regs[i]);
2080 freeReg (sym->regs[i]);
2087 /*-----------------------------------------------------------------*/
2088 /* reassignLR - reassign this to registers */
2089 /*-----------------------------------------------------------------*/
2091 reassignLR (operand * op)
2093 symbol *sym = OP_SYMBOL (op);
2096 debugLog ("%s\n", __FUNCTION__);
2097 /* not spilt any more */
2098 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2099 bitVectUnSetBit (_G.spiltSet, sym->key);
2101 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2105 for (i = 0; i < sym->nRegs; i++)
2106 sym->regs[i]->isFree = 0;
2109 /*-----------------------------------------------------------------*/
2110 /* willCauseSpill - determines if allocating will cause a spill */
2111 /*-----------------------------------------------------------------*/
2113 willCauseSpill (int nr, int rt)
2115 debugLog ("%s\n", __FUNCTION__);
2116 /* first check if there are any avlb registers
2117 of te type required */
2120 /* special case for pointer type
2121 if pointer type not avlb then
2122 check for type gpr */
2123 if (nFreeRegs (rt) >= nr)
2125 if (nFreeRegs (REG_GPR) >= nr)
2130 if (pic16_ptrRegReq)
2132 if (nFreeRegs (rt) >= nr)
2137 if (nFreeRegs (REG_PTR) +
2138 nFreeRegs (REG_GPR) >= nr)
2143 debugLog (" ... yep it will (cause a spill)\n");
2144 /* it will cause a spil */
2148 /*-----------------------------------------------------------------*/
2149 /* positionRegs - the allocator can allocate same registers to res- */
2150 /* ult and operand, if this happens make sure they are in the same */
2151 /* position as the operand otherwise chaos results */
2152 /*-----------------------------------------------------------------*/
2154 positionRegs (symbol * result, symbol * opsym, int lineno)
2156 int count = min (result->nRegs, opsym->nRegs);
2157 int i, j = 0, shared = 0;
2159 debugLog ("%s\n", __FUNCTION__);
2160 /* if the result has been spilt then cannot share */
2165 /* first make sure that they actually share */
2166 for (i = 0; i < count; i++)
2168 for (j = 0; j < count; j++)
2170 if (result->regs[i] == opsym->regs[j] && i != j)
2180 regs *tmp = result->regs[i];
2181 result->regs[i] = result->regs[j];
2182 result->regs[j] = tmp;
2187 /*------------------------------------------------------------------*/
2188 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2189 /* it should either have registers or have beed spilled. Otherwise, */
2190 /* there was an uninitialized variable, so just spill this to get */
2191 /* the operand in a valid state. */
2192 /*------------------------------------------------------------------*/
2194 verifyRegsAssigned (operand *op, iCode * ic)
2199 if (!IS_ITEMP (op)) return;
2201 sym = OP_SYMBOL (op);
2202 if (sym->isspilt) return;
2203 if (!sym->nRegs) return;
2204 if (sym->regs[0]) return;
2206 werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2207 sym->prereqv ? sym->prereqv->name : sym->name);
2212 /*-----------------------------------------------------------------*/
2213 /* serialRegAssign - serially allocate registers to the variables */
2214 /*-----------------------------------------------------------------*/
2216 serialRegAssign (eBBlock ** ebbs, int count)
2221 debugLog ("%s\n", __FUNCTION__);
2222 /* for all blocks */
2223 for (i = 0; i < count; i++)
2225 if (ebbs[i]->noPath &&
2226 (ebbs[i]->entryLabel != entryLabel &&
2227 ebbs[i]->entryLabel != returnLabel))
2230 /* of all instructions do */
2231 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2234 debugLog (" op: %s\n", pic16_decodeOp (ic->op));
2236 if(IC_RESULT(ic) && !IS_ITEMP( IC_RESULT(ic)))
2237 pic16_allocDirReg(IC_RESULT(ic));
2239 if(IC_LEFT(ic) && !IS_ITEMP( IC_LEFT(ic)))
2240 pic16_allocDirReg(IC_LEFT(ic));
2242 if(IC_RIGHT(ic) && !IS_ITEMP( IC_RIGHT(ic)))
2243 pic16_allocDirReg(IC_RIGHT(ic));
2245 /* if this is an ipop that means some live
2246 range will have to be assigned again */
2248 reassignLR (IC_LEFT (ic));
2250 /* if result is present && is a true symbol */
2251 if (IC_RESULT (ic) && ic->op != IFX &&
2252 IS_TRUE_SYMOP (IC_RESULT (ic)))
2253 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2255 /* take away registers from live
2256 ranges that end at this instruction */
2257 deassignLRs (ic, ebbs[i]);
2259 /* some don't need registers */
2260 if (SKIP_IC2 (ic) ||
2261 ic->op == JUMPTABLE ||
2265 (IC_RESULT (ic) && POINTER_SET (ic)))
2268 /* now we need to allocate registers
2269 only for the result */
2272 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2278 /* Make sure any spill location is definately allocated */
2279 if (sym->isspilt && !sym->remat && sym->usl.spillLoc &&
2280 !sym->usl.spillLoc->allocreq)
2282 sym->usl.spillLoc->allocreq++;
2285 /* if it does not need or is spilt
2286 or is already assigned to registers
2287 or will not live beyond this instructions */
2290 bitVectBitValue (_G.regAssigned, sym->key) ||
2291 sym->liveTo <= ic->seq)
2294 /* if some liverange has been spilt at the block level
2295 and this one live beyond this block then spil this
2297 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2302 /* if trying to allocate this will cause
2303 a spill and there is nothing to spill
2304 or this one is rematerializable then
2306 willCS = willCauseSpill (sym->nRegs, sym->regType);
2307 spillable = computeSpillable (ic);
2309 (willCS && bitVectIsZero (spillable)))
2317 /* If the live range preceeds the point of definition
2318 then ideally we must take into account registers that
2319 have been allocated after sym->liveFrom but freed
2320 before ic->seq. This is complicated, so spill this
2321 symbol instead and let fillGaps handle the allocation. */
2322 if (sym->liveFrom < ic->seq)
2328 /* if it has a spillocation & is used less than
2329 all other live ranges then spill this */
2331 if (sym->usl.spillLoc) {
2332 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2333 allLRs, ebbs[i], ic));
2334 if (leastUsed && leastUsed->used > sym->used) {
2339 /* if none of the liveRanges have a spillLocation then better
2340 to spill this one than anything else already assigned to registers */
2341 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2342 /* if this is local to this block then we might find a block spil */
2343 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2351 if (ic->op == RECEIVE)
2352 debugLog ("When I get clever, I'll optimize the receive logic\n");
2354 if(POINTER_GET(ic) && IS_BITFIELD(getSpec(operandType(IC_RESULT(ic))))
2355 && (SPEC_BLEN(getSpec(operandType(IC_RESULT(ic))))==1)
2356 && (ic->next->op == IFX)
2357 && (OP_LIVETO(IC_RESULT(ic)) == ic->next->seq)) {
2359 /* skip register allocation since none will be used */
2360 for(j=0;j<sym->nRegs;j++)
2361 sym->regs[j] = newReg(REG_TMP, PO_GPR_TEMP, 0, "bad", 1, 0, NULL);
2362 // OP_SYMBOL(IC_RESULT(ic))->nRegs = 0;
2367 /* if we need ptr regs for the right side
2369 if (POINTER_GET (ic) && IS_SYMOP( IC_LEFT(ic) ) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2370 <= (unsigned) PTRSIZE)
2375 /* else we assign registers to it */
2376 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2379 bitVectDebugOn(_G.regAssigned, debugF);
2381 for (j = 0; j < sym->nRegs; j++)
2383 if (sym->regType == REG_PTR)
2384 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2386 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2388 /* if the allocation falied which means
2389 this was spilt then break */
2393 debugLog (" %d - \n", __LINE__);
2395 /* if it shares registers with operands make sure
2396 that they are in the same position */
2397 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2398 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2399 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2400 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2401 /* do the same for the right operand */
2402 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2403 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2404 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2405 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2407 debugLog (" %d - \n", __LINE__);
2410 debugLog (" %d - \n", __LINE__);
2419 /* Check for and fix any problems with uninitialized operands */
2420 for (i = 0; i < count; i++)
2424 if (ebbs[i]->noPath &&
2425 (ebbs[i]->entryLabel != entryLabel &&
2426 ebbs[i]->entryLabel != returnLabel))
2429 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2436 verifyRegsAssigned (IC_COND (ic), ic);
2440 if (ic->op == JUMPTABLE)
2442 verifyRegsAssigned (IC_JTCOND (ic), ic);
2446 verifyRegsAssigned (IC_RESULT (ic), ic);
2447 verifyRegsAssigned (IC_LEFT (ic), ic);
2448 verifyRegsAssigned (IC_RIGHT (ic), ic);
2454 /*-----------------------------------------------------------------*/
2455 /* rUmaskForOp :- returns register mask for an operand */
2456 /*-----------------------------------------------------------------*/
2458 rUmaskForOp (operand * op)
2464 debugLog ("%s\n", __FUNCTION__);
2465 /* only temporaries are assigned registers */
2469 sym = OP_SYMBOL (op);
2471 /* if spilt or no registers assigned to it
2473 if (sym->isspilt || !sym->nRegs)
2476 rumask = newBitVect (pic16_nRegs);
2478 for (j = 0; j < sym->nRegs; j++)
2480 rumask = bitVectSetBit (rumask,
2481 sym->regs[j]->rIdx);
2487 /*-----------------------------------------------------------------*/
2488 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2489 /*-----------------------------------------------------------------*/
2491 regsUsedIniCode (iCode * ic)
2493 bitVect *rmask = newBitVect (pic16_nRegs);
2495 debugLog ("%s\n", __FUNCTION__);
2496 /* do the special cases first */
2499 rmask = bitVectUnion (rmask,
2500 rUmaskForOp (IC_COND (ic)));
2504 /* for the jumptable */
2505 if (ic->op == JUMPTABLE)
2507 rmask = bitVectUnion (rmask,
2508 rUmaskForOp (IC_JTCOND (ic)));
2513 /* of all other cases */
2515 rmask = bitVectUnion (rmask,
2516 rUmaskForOp (IC_LEFT (ic)));
2520 rmask = bitVectUnion (rmask,
2521 rUmaskForOp (IC_RIGHT (ic)));
2524 rmask = bitVectUnion (rmask,
2525 rUmaskForOp (IC_RESULT (ic)));
2531 /*-----------------------------------------------------------------*/
2532 /* createRegMask - for each instruction will determine the regsUsed */
2533 /*-----------------------------------------------------------------*/
2535 createRegMask (eBBlock ** ebbs, int count)
2539 debugLog ("%s\n", __FUNCTION__);
2540 /* for all blocks */
2541 for (i = 0; i < count; i++)
2545 if (ebbs[i]->noPath &&
2546 (ebbs[i]->entryLabel != entryLabel &&
2547 ebbs[i]->entryLabel != returnLabel))
2550 /* for all instructions */
2551 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2556 if (SKIP_IC2 (ic) || !ic->rlive)
2559 /* first mark the registers used in this
2561 ic->rUsed = regsUsedIniCode (ic);
2562 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2564 /* now create the register mask for those
2565 registers that are in use : this is a
2566 super set of ic->rUsed */
2567 ic->rMask = newBitVect (pic16_nRegs + 1);
2569 /* for all live Ranges alive at this point */
2570 for (j = 1; j < ic->rlive->size; j++)
2575 /* if not alive then continue */
2576 if (!bitVectBitValue (ic->rlive, j))
2579 /* find the live range we are interested in */
2580 if (!(sym = hTabItemWithKey (liveRanges, j)))
2582 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2583 "createRegMask cannot find live range");
2587 /* if no register assigned to it */
2588 if (!sym->nRegs || sym->isspilt)
2591 /* for all the registers allocated to it */
2592 for (k = 0; k < sym->nRegs; k++)
2595 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2601 /*-----------------------------------------------------------------*/
2602 /* rematStr - returns the rematerialized string for a remat var */
2603 /*-----------------------------------------------------------------*/
2605 rematStr (symbol * sym)
2608 iCode *ic = sym->rematiCode;
2609 symbol *psym = NULL;
2611 debugLog ("%s\n", __FUNCTION__);
2613 //printf ("%s\n", s);
2615 /* if plus or minus print the right hand side */
2617 if (ic->op == '+' || ic->op == '-') {
2619 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2621 sprintf (s, "(%s %c 0x%04x)",
2622 OP_SYMBOL (IC_LEFT (ric))->rname,
2624 (int) operandLitValue (IC_RIGHT (ic)));
2627 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2629 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2630 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2635 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2636 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2638 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2643 /*-----------------------------------------------------------------*/
2644 /* rematStr - returns the rematerialized string for a remat var */
2645 /*-----------------------------------------------------------------*/
2647 rematStr (symbol * sym)
2650 iCode *ic = sym->rematiCode;
2652 debugLog ("%s\n", __FUNCTION__);
2657 /* if plus or minus print the right hand side */
2659 if (ic->op == '+' || ic->op == '-') {
2660 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2663 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2667 if (ic->op == '+' || ic->op == '-')
2669 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2670 sprintf (s, "(%s %c 0x%04x)",
2671 OP_SYMBOL (IC_LEFT (ric))->rname,
2673 (int) operandLitValue (IC_RIGHT (ic)));
2676 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2678 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2682 /* we reached the end */
2683 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2687 printf ("%s\n", buffer);
2692 /*-----------------------------------------------------------------*/
2693 /* regTypeNum - computes the type & number of registers required */
2694 /*-----------------------------------------------------------------*/
2702 debugLog ("%s\n", __FUNCTION__);
2703 /* for each live range do */
2704 for (sym = hTabFirstItem (liveRanges, &k); sym;
2705 sym = hTabNextItem (liveRanges, &k)) {
2707 debugLog (" %d - %s\n", __LINE__, sym->rname);
2708 //fprintf(stderr," %d - %s\n", __LINE__, sym->rname);
2710 /* if used zero times then no registers needed */
2711 if ((sym->liveTo - sym->liveFrom) == 0)
2715 /* if the live range is a temporary */
2718 debugLog (" %d - itemp register\n", __LINE__);
2720 /* if the type is marked as a conditional */
2721 if (sym->regType == REG_CND)
2724 /* if used in return only then we don't
2726 if (sym->ruonly || sym->accuse) {
2727 if (IS_AGGREGATE (sym->type) || sym->isptr)
2728 sym->type = aggrToPtr (sym->type, FALSE);
2729 debugLog (" %d - no reg needed - used as a return\n", __LINE__);
2733 /* if the symbol has only one definition &
2734 that definition is a get_pointer and the
2735 pointer we are getting is rematerializable and
2738 if (bitVectnBitsOn (sym->defs) == 1 &&
2739 (ic = hTabItemWithKey (iCodehTab,
2740 bitVectFirstBit (sym->defs))) &&
2742 !IS_BITVAR (sym->etype) &&
2743 (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2745 if (ptrPseudoSymSafe (sym, ic)) {
2749 debugLog (" %d - \n", __LINE__);
2751 /* create a psuedo symbol & force a spil */
2752 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2753 psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2754 psym->type = sym->type;
2755 psym->etype = sym->etype;
2756 psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2757 strcpy (psym->rname, psym->name);
2759 sym->usl.spillLoc = psym;
2763 /* if in data space or idata space then try to
2764 allocate pointer register */
2768 /* if not then we require registers */
2769 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2770 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2771 getSize (sym->type));
2775 if(IS_PTR_CONST (sym->type)) {
2777 if(IS_CODEPTR (sym->type)) {
2779 // what IS this ???? (HJD)
2780 debugLog (" %d const pointer type requires %d registers, changing to 3\n",__LINE__,sym->nRegs); // patch 14
2781 sym->nRegs = 3; // patch 14
2784 if (sym->nRegs > 4) {
2785 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2786 printTypeChain (sym->type, stderr);
2787 fprintf (stderr, "\n");
2790 /* determine the type of register required */
2791 if (sym->nRegs == 1 &&
2792 IS_PTR (sym->type) &&
2794 sym->regType = REG_PTR;
2796 sym->regType = REG_GPR;
2799 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2803 /* for the first run we don't provide */
2804 /* registers for true symbols we will */
2805 /* see how things go */
2811 static DEFSETFUNC (markRegFree)
2813 ((regs *)item)->isFree = 1;
2818 DEFSETFUNC (pic16_deallocReg)
2820 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2821 ((regs *)item)->isFree = 1;
2822 ((regs *)item)->wasUsed = 0;
2826 /*-----------------------------------------------------------------*/
2827 /* freeAllRegs - mark all registers as free */
2828 /*-----------------------------------------------------------------*/
2830 pic16_freeAllRegs ()
2832 debugLog ("%s\n", __FUNCTION__);
2834 applyToSet(pic16_dynAllocRegs,markRegFree);
2835 applyToSet(pic16_dynStackRegs,markRegFree);
2838 /*-----------------------------------------------------------------*/
2839 /*-----------------------------------------------------------------*/
2841 pic16_deallocateAllRegs ()
2843 debugLog ("%s\n", __FUNCTION__);
2845 applyToSet(pic16_dynAllocRegs,pic16_deallocReg);
2849 /*-----------------------------------------------------------------*/
2850 /* deallocStackSpil - this will set the stack pointer back */
2851 /*-----------------------------------------------------------------*/
2853 DEFSETFUNC (deallocStackSpil)
2857 debugLog ("%s\n", __FUNCTION__);
2862 /*-----------------------------------------------------------------*/
2863 /* farSpacePackable - returns the packable icode for far variables */
2864 /*-----------------------------------------------------------------*/
2866 farSpacePackable (iCode * ic)
2870 debugLog ("%s\n", __FUNCTION__);
2871 /* go thru till we find a definition for the
2872 symbol on the right */
2873 for (dic = ic->prev; dic; dic = dic->prev)
2876 /* if the definition is a call then no */
2877 if ((dic->op == CALL || dic->op == PCALL) &&
2878 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2883 /* if shift by unknown amount then not */
2884 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2885 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2888 /* if pointer get and size > 1 */
2889 if (POINTER_GET (dic) &&
2890 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2893 if (POINTER_SET (dic) &&
2894 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2897 /* if any three is a true symbol in far space */
2898 if (IC_RESULT (dic) &&
2899 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2900 isOperandInFarSpace (IC_RESULT (dic)))
2903 if (IC_RIGHT (dic) &&
2904 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2905 isOperandInFarSpace (IC_RIGHT (dic)) &&
2906 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2909 if (IC_LEFT (dic) &&
2910 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2911 isOperandInFarSpace (IC_LEFT (dic)) &&
2912 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2915 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2917 if ((dic->op == LEFT_OP ||
2918 dic->op == RIGHT_OP ||
2920 IS_OP_LITERAL (IC_RIGHT (dic)))
2930 /*-----------------------------------------------------------------*/
2931 /* packRegsForAssign - register reduction for assignment */
2932 /*-----------------------------------------------------------------*/
2934 packRegsForAssign (iCode * ic, eBBlock * ebp)
2939 debugLog ("%d\t%s\n", __LINE__, __FUNCTION__);
2940 debugLog ("ic->op = %s\n", pic16_decodeOp( ic->op ) );
2941 debugAopGet (" result:", IC_RESULT (ic));
2942 debugAopGet (" left:", IC_LEFT (ic));
2943 debugAopGet (" right:", IC_RIGHT (ic));
2945 // fprintf(stderr, "%s:%d symbol = %s\n", __FILE__, __LINE__, OP_SYMBOL( IC_RESULT(ic))->name);
2947 debugLog(" %d - actuall processing\n", __LINE__ );
2949 if (!IS_ITEMP (IC_RESULT (ic))) {
2950 pic16_allocDirReg(IC_RESULT (ic));
2951 debugLog (" %d - result is not temp\n", __LINE__);
2954 // if(IS_VALOP(IC_RIGHT(ic)))return 0;
2956 /* See BUGLOG0001 - VR */
2958 if (!IS_ITEMP (IC_RIGHT (ic)) /*&& (!IS_PARM(IC_RESULT(ic)))*/) {
2959 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2960 pic16_allocDirReg(IC_RIGHT (ic));
2965 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2966 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2968 debugLog (" %d - not packing - right side fails \n", __LINE__);
2972 /* if the true symbol is defined in far space or on stack
2973 then we should not since this will increase register pressure */
2974 if (isOperandInFarSpace (IC_RESULT (ic)))
2976 if ((dic = farSpacePackable (ic)))
2983 /* find the definition of iTempNN scanning backwards if we find a
2984 a use of the true symbol before we find the definition then
2986 for (dic = ic->prev; dic; dic = dic->prev)
2989 /* if there is a function call and this is
2990 a parameter & not my parameter then don't pack it */
2991 if ((dic->op == CALL || dic->op == PCALL) &&
2992 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2993 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2995 debugLog (" %d - \n", __LINE__);
3004 debugLog("%d\tSearching for iTempNN\n", __LINE__);
3006 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3007 IS_OP_VOLATILE (IC_RESULT (dic)))
3009 debugLog (" %d - dic is VOLATILE \n", __LINE__);
3015 if( IS_SYMOP( IC_RESULT(dic)) &&
3016 IS_BITFIELD( OP_SYMBOL(IC_RESULT(dic))->etype ) ) {
3018 debugLog (" %d - result is bitfield\n", __LINE__);
3024 if (IS_SYMOP (IC_RESULT (dic)) &&
3025 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3027 /* A previous result was assigned to the same register - we'll our definition */
3028 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
3029 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3030 if (POINTER_SET (dic))
3036 if (IS_SYMOP (IC_RIGHT (dic)) &&
3037 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3038 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3040 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
3045 if (IS_SYMOP (IC_LEFT (dic)) &&
3046 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3047 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3049 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
3054 if (POINTER_SET (dic) &&
3055 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3057 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
3065 return 0; /* did not find */
3068 /* This code is taken from the hc08 port. Do not know
3069 * if it fits for pic16, but I leave it here just in case */
3071 /* if assignment then check that right is not a bit */
3072 if (ASSIGNMENT (dic) && !POINTER_SET (dic)) {
3073 sym_link *etype = operandType (IC_RIGHT (dic));
3075 if (IS_BITFIELD (etype)) {
3076 /* if result is a bit too then it's ok */
3077 etype = operandType (IC_RESULT (dic));
3078 if (!IS_BITFIELD (etype)) {
3079 debugLog(" %d bitfields\n");
3086 /* if the result is on stack or iaccess then it must be
3087 the same atleast one of the operands */
3088 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3089 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3091 /* the operation has only one symbol
3092 operator then we can pack */
3093 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3094 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3097 if (!((IC_LEFT (dic) &&
3098 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3100 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3104 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3105 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3106 /* found the definition */
3107 /* replace the result with the result of */
3108 /* this assignment and remove this assignment */
3109 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3110 IC_RESULT (dic) = IC_RESULT (ic);
3112 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3114 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3116 /* delete from liverange table also
3117 delete from all the points inbetween and the new
3119 for (sic = dic; sic != ic; sic = sic->next)
3121 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3122 if (IS_ITEMP (IC_RESULT (dic)))
3123 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3126 remiCodeFromeBBlock (ebp, ic);
3127 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3129 debugLog(" %d\n", __LINE__ );
3130 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3131 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3139 #define NO_packRegsForAccUse
3140 #define NO_packRegsForSupport
3141 #define NO_packRegsForOneuse
3142 #define NO_cast_peep
3147 #ifndef NO_packRegsForSupport
3148 /*-----------------------------------------------------------------*/
3149 /* findAssignToSym : scanning backwards looks for first assig found */
3150 /*-----------------------------------------------------------------*/
3152 findAssignToSym (operand * op, iCode * ic)
3156 debugLog ("%s\n", __FUNCTION__);
3157 for (dic = ic->prev; dic; dic = dic->prev)
3160 /* if definition by assignment */
3161 if (dic->op == '=' &&
3162 !POINTER_SET (dic) &&
3163 IC_RESULT (dic)->key == op->key
3164 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3168 /* we are interested only if defined in far space */
3169 /* or in stack space in case of + & - */
3171 /* if assigned to a non-symbol then return
3173 if (!IS_SYMOP (IC_RIGHT (dic)))
3176 /* if the symbol is in far space then
3178 if (isOperandInFarSpace (IC_RIGHT (dic)))
3181 /* for + & - operations make sure that
3182 if it is on the stack it is the same
3183 as one of the three operands */
3184 if ((ic->op == '+' || ic->op == '-') &&
3185 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3187 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3188 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3189 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3197 /* if we find an usage then we cannot delete it */
3198 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3201 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3204 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3208 /* now make sure that the right side of dic
3209 is not defined between ic & dic */
3212 iCode *sic = dic->next;
3214 for (; sic != ic; sic = sic->next)
3215 if (IC_RESULT (sic) &&
3216 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3227 #ifndef NO_packRegsForSupport
3228 /*-----------------------------------------------------------------*/
3229 /* packRegsForSupport :- reduce some registers for support calls */
3230 /*-----------------------------------------------------------------*/
3232 packRegsForSupport (iCode * ic, eBBlock * ebp)
3236 debugLog ("%s\n", __FUNCTION__);
3237 /* for the left & right operand :- look to see if the
3238 left was assigned a true symbol in far space in that
3239 case replace them */
3240 if (IS_ITEMP (IC_LEFT (ic)) &&
3241 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3243 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3249 debugAopGet ("removing left:", IC_LEFT (ic));
3251 /* found it we need to remove it from the
3253 for (sic = dic; sic != ic; sic = sic->next)
3254 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3256 IC_LEFT (ic)->operand.symOperand =
3257 IC_RIGHT (dic)->operand.symOperand;
3258 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3259 remiCodeFromeBBlock (ebp, dic);
3260 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3261 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3265 /* do the same for the right operand */
3268 IS_ITEMP (IC_RIGHT (ic)) &&
3269 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3271 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3277 /* if this is a subtraction & the result
3278 is a true symbol in far space then don't pack */
3279 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3281 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3282 if (IN_FARSPACE (SPEC_OCLS (etype)))
3286 debugAopGet ("removing right:", IC_RIGHT (ic));
3288 /* found it we need to remove it from the
3290 for (sic = dic; sic != ic; sic = sic->next)
3291 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3293 IC_RIGHT (ic)->operand.symOperand =
3294 IC_RIGHT (dic)->operand.symOperand;
3295 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3297 remiCodeFromeBBlock (ebp, dic);
3298 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3299 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3308 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3310 #ifndef NO_packRegsForOneuse
3311 /*-----------------------------------------------------------------*/
3312 /* packRegsForOneuse : - will reduce some registers for single Use */
3313 /*-----------------------------------------------------------------*/
3315 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3320 debugLog ("%s\n", __FUNCTION__);
3321 /* if returning a literal then do nothing */
3325 /* only upto 2 bytes since we cannot predict
3326 the usage of b, & acc */
3327 if (getSize (operandType (op)) > (pic16_fReturnSizePic - 3) && /* was 2, changed to 3 -- VR */
3332 /* this routine will mark the a symbol as used in one
3333 instruction use only && if the definition is local
3334 (ie. within the basic block) && has only one definition &&
3335 that definition is either a return value from a
3336 function or does not contain any variables in
3338 uses = bitVectCopy (OP_USES (op));
3339 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3340 if (!bitVectIsZero (uses)) /* has other uses */
3343 /* if it has only one defintion */
3344 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3345 return NULL; /* has more than one definition */
3347 /* get that definition */
3349 hTabItemWithKey (iCodehTab,
3350 bitVectFirstBit (OP_DEFS (op)))))
3353 /* found the definition now check if it is local */
3354 if (dic->seq < ebp->fSeq ||
3355 dic->seq > ebp->lSeq)
3356 return NULL; /* non-local */
3358 /* now check if it is the return from
3360 if (dic->op == CALL || dic->op == PCALL)
3362 if (ic->op != SEND && ic->op != RETURN &&
3363 !POINTER_SET(ic) && !POINTER_GET(ic))
3365 OP_SYMBOL (op)->ruonly = 1;
3372 /* otherwise check that the definition does
3373 not contain any symbols in far space */
3374 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3375 isOperandInFarSpace (IC_RIGHT (dic)) ||
3376 IS_OP_RUONLY (IC_LEFT (ic)) ||
3377 IS_OP_RUONLY (IC_RIGHT (ic)))
3382 /* if pointer set then make sure the pointer
3384 if (POINTER_SET (dic) &&
3385 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3388 if (POINTER_GET (dic) &&
3389 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3394 /* also make sure the intervenening instructions
3395 don't have any thing in far space */
3396 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3399 /* if there is an intervening function call then no */
3400 if (dic->op == CALL || dic->op == PCALL)
3402 /* if pointer set then make sure the pointer
3404 if (POINTER_SET (dic) &&
3405 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3408 if (POINTER_GET (dic) &&
3409 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3412 /* if address of & the result is remat then okay */
3413 if (dic->op == ADDRESS_OF &&
3414 OP_SYMBOL (IC_RESULT (dic))->remat)
3417 /* if operand has size of three or more & this
3418 operation is a '*','/' or '%' then 'b' may
3420 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3421 getSize (operandType (op)) >= 3)
3424 /* if left or right or result is in far space */
3425 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3426 isOperandInFarSpace (IC_RIGHT (dic)) ||
3427 isOperandInFarSpace (IC_RESULT (dic)) ||
3428 IS_OP_RUONLY (IC_LEFT (dic)) ||
3429 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3430 IS_OP_RUONLY (IC_RESULT (dic)))
3436 OP_SYMBOL (op)->ruonly = 1;
3443 /*-----------------------------------------------------------------*/
3444 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3445 /*-----------------------------------------------------------------*/
3447 isBitwiseOptimizable (iCode * ic)
3449 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3450 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3452 debugLog ("%s\n", __FUNCTION__);
3453 /* bitwise operations are considered optimizable
3454 under the following conditions (Jean-Louis VERN)
3466 if (IS_LITERAL (rtype) ||
3467 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3474 #ifndef NO_packRegsForAccUse
3476 /*-----------------------------------------------------------------*/
3477 /* packRegsForAccUse - pack registers for acc use */
3478 /*-----------------------------------------------------------------*/
3480 packRegsForAccUse (iCode * ic)
3484 debugLog ("%s\n", __FUNCTION__);
3486 /* if this is an aggregate, e.g. a one byte char array */
3487 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3490 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3492 /* if + or - then it has to be one byte result */
3493 if ((ic->op == '+' || ic->op == '-')
3494 && getSize (operandType (IC_RESULT (ic))) > 1)
3497 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3498 /* if shift operation make sure right side is not a literal */
3499 if (ic->op == RIGHT_OP &&
3500 (isOperandLiteral (IC_RIGHT (ic)) ||
3501 getSize (operandType (IC_RESULT (ic))) > 1))
3504 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3505 if (ic->op == LEFT_OP &&
3506 (isOperandLiteral (IC_RIGHT (ic)) ||
3507 getSize (operandType (IC_RESULT (ic))) > 1))
3510 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3511 if (IS_BITWISE_OP (ic) &&
3512 getSize (operandType (IC_RESULT (ic))) > 1)
3516 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3517 /* has only one definition */
3518 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3521 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3522 /* has only one use */
3523 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3526 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3527 /* and the usage immediately follows this iCode */
3528 if (!(uic = hTabItemWithKey (iCodehTab,
3529 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3532 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3533 if (ic->next != uic)
3536 /* if it is a conditional branch then we definitely can */
3540 if (uic->op == JUMPTABLE)
3543 /* if the usage is not is an assignment
3544 or an arithmetic / bitwise / shift operation then not */
3545 if (POINTER_SET (uic) &&
3546 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3549 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3550 if (uic->op != '=' &&
3551 !IS_ARITHMETIC_OP (uic) &&
3552 !IS_BITWISE_OP (uic) &&
3553 uic->op != LEFT_OP &&
3554 uic->op != RIGHT_OP)
3557 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3558 /* if used in ^ operation then make sure right is not a
3560 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3563 /* if shift operation make sure right side is not a literal */
3564 if (uic->op == RIGHT_OP &&
3565 (isOperandLiteral (IC_RIGHT (uic)) ||
3566 getSize (operandType (IC_RESULT (uic))) > 1))
3569 if (uic->op == LEFT_OP &&
3570 (isOperandLiteral (IC_RIGHT (uic)) ||
3571 getSize (operandType (IC_RESULT (uic))) > 1))
3574 /* make sure that the result of this icode is not on the
3575 stack, since acc is used to compute stack offset */
3576 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3577 OP_SYMBOL (IC_RESULT (uic))->onStack)
3580 /* if either one of them in far space then we cannot */
3581 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3582 isOperandInFarSpace (IC_LEFT (uic))) ||
3583 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3584 isOperandInFarSpace (IC_RIGHT (uic))))
3587 /* if the usage has only one operand then we can */
3588 if (IC_LEFT (uic) == NULL ||
3589 IC_RIGHT (uic) == NULL)
3592 /* make sure this is on the left side if not
3593 a '+' since '+' is commutative */
3594 if (ic->op != '+' &&
3595 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3599 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3600 /* if one of them is a literal then we can */
3601 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3602 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3603 (getSize (operandType (IC_RESULT (uic))) <= 1))
3605 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3610 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3611 /* if the other one is not on stack then we can */
3612 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3613 (IS_ITEMP (IC_RIGHT (uic)) ||
3614 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3615 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3618 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3619 (IS_ITEMP (IC_LEFT (uic)) ||
3620 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3621 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3627 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3628 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3635 /*-----------------------------------------------------------------*/
3636 /* packForPush - hueristics to reduce iCode for pushing */
3637 /*-----------------------------------------------------------------*/
3639 packForReceive (iCode * ic, eBBlock * ebp)
3643 debugLog ("%s\n", __FUNCTION__);
3644 debugAopGet (" result:", IC_RESULT (ic));
3645 debugAopGet (" left:", IC_LEFT (ic));
3646 debugAopGet (" right:", IC_RIGHT (ic));
3651 for (dic = ic->next; dic; dic = dic->next)
3653 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3654 debugLog (" used on left\n");
3655 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3656 debugLog (" used on right\n");
3657 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3658 debugLog (" used on result\n");
3660 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3661 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3665 debugLog (" hey we can remove this unnecessary assign\n");
3667 /*-----------------------------------------------------------------*/
3668 /* packForPush - hueristics to reduce iCode for pushing */
3669 /*-----------------------------------------------------------------*/
3671 packForPush (iCode * ic, eBBlock * ebp)
3675 debugLog ("%s\n", __FUNCTION__);
3676 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3683 n1 = bitVectnBitsOn( OP_DEFS(IC_LEFT(ic)));
3684 n2 = bitVectnBitsOn( OP_USES(IC_LEFT(ic)));
3685 debugf3("defs: %d\tuses: %d\t%s\n", n1, n2, printILine(ic));
3686 debugf2("IC_LEFT(ic): from %d to %d\n", OP_LIVEFROM(IC_LEFT(ic)), OP_LIVETO(IC_LEFT(ic)));
3690 /* must have only definition & one usage */
3691 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3692 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3695 /* find the definition */
3696 if (!(dic = hTabItemWithKey (iCodehTab,
3697 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3700 /* if definition is not assignment,
3701 * or is not pointer (because pointer might have changed) */
3702 if (dic->op != '=' || POINTER_SET (dic))
3705 /* we must ensure that we can use the delete the assignment,
3706 * because the source might have been modified in between.
3707 * Until I know how to fix this, I'll use the adhoc fix
3708 * to check the liveranges */
3709 if((OP_LIVEFROM(IC_RIGHT(dic))==0) || (OP_LIVETO(IC_RIGHT(dic))==0))
3711 // debugf2("IC_RIGHT(dic): from %d to %d\n", OP_LIVEFROM(IC_RIGHT(dic)), OP_LIVETO(IC_RIGHT(dic)));
3715 /* we now we know that it has one & only one def & use
3716 and the that the definition is an assignment */
3717 IC_LEFT (ic) = IC_RIGHT (dic);
3719 debugf("remiCodeFromeBBlock: %s\n", printILine(dic));
3721 remiCodeFromeBBlock (ebp, dic);
3722 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3723 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3726 static void printSymType(char * str, sym_link *sl)
3728 if(!pic16_ralloc_debug)return;
3730 debugLog (" %s Symbol type: ",str);
3731 printTypeChain( sl, debugF);
3735 /*-----------------------------------------------------------------*/
3736 /* some debug code to print the symbol S_TYPE. Note that
3737 * the function checkSClass in src/SDCCsymt.c dinks with
3738 * the S_TYPE in ways the PIC port doesn't fully like...*/
3739 /*-----------------------------------------------------------------*/
3740 static void isData(sym_link *sl)
3744 if(!pic16_ralloc_debug)return;
3751 for ( ; sl; sl=sl->next) {
3753 switch (SPEC_SCLS(sl)) {
3754 case S_DATA: fprintf (of, "data "); break;
3755 case S_XDATA: fprintf (of, "xdata "); break;
3756 case S_SFR: fprintf (of, "sfr "); break;
3757 case S_SBIT: fprintf (of, "sbit "); break;
3758 case S_CODE: fprintf (of, "code "); break;
3759 case S_IDATA: fprintf (of, "idata "); break;
3760 case S_PDATA: fprintf (of, "pdata "); break;
3761 case S_LITERAL: fprintf (of, "literal "); break;
3762 case S_STACK: fprintf (of, "stack "); break;
3763 case S_XSTACK: fprintf (of, "xstack "); break;
3764 case S_BIT: fprintf (of, "bit "); break;
3765 case S_EEPROM: fprintf (of, "eeprom "); break;
3773 /*--------------------------------------------------------------------*/
3774 /* pic16_packRegisters - does some transformations to reduce */
3775 /* register pressure */
3777 /*--------------------------------------------------------------------*/
3779 pic16_packRegisters (eBBlock * ebp)
3784 debugLog ("%s\n", __FUNCTION__);
3790 /* look for assignments of the form */
3791 /* iTempNN = TRueSym (someoperation) SomeOperand */
3793 /* TrueSym := iTempNN:1 */
3794 for (ic = ebp->sch; ic; ic = ic->next)
3796 // debugLog("%d\n", __LINE__);
3797 /* find assignment of the form TrueSym := iTempNN:1 */
3798 if ( (ic->op == '=') && !POINTER_SET (ic) ) // patch 11
3799 change += packRegsForAssign (ic, ebp);
3803 if (POINTER_SET (ic))
3804 debugLog ("pointer is set\n");
3805 debugAopGet (" result:", IC_RESULT (ic));
3806 debugAopGet (" left:", IC_LEFT (ic));
3807 debugAopGet (" right:", IC_RIGHT (ic));
3816 for (ic = ebp->sch; ic; ic = ic->next) {
3818 if(IS_SYMOP ( IC_LEFT(ic))) {
3819 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3821 debugAopGet ("x left:", IC_LEFT (ic));
3823 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3825 if(IS_CODEPTR(OP_SYMBOL(IC_LEFT(ic))->type))
3827 debugLog (" is a pointer\n");
3829 if(IS_PTR(OP_SYMBOL(IC_LEFT(ic))->type))
3830 debugLog (" is a ptr\n");
3832 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3833 debugLog (" is volatile\n");
3837 if(IS_OP_VOLATILE(IC_LEFT(ic))) {
3838 debugLog (" %d - left is not temp, allocating\n", __LINE__);
3839 pic16_allocDirReg(IC_LEFT (ic));
3842 printSymType("c ", OP_SYMBOL(IC_LEFT(ic))->type);
3845 if(IS_SYMOP ( IC_RIGHT(ic))) {
3846 debugAopGet (" right:", IC_RIGHT (ic));
3847 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3850 if(IS_SYMOP ( IC_RESULT(ic))) {
3851 debugAopGet (" result:", IC_RESULT (ic));
3852 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3855 if(IS_TRUE_SYMOP ( IC_RIGHT(ic))) {
3856 debugAopGet (" right:", IC_RIGHT (ic));
3857 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3858 // pic16_allocDirReg(IC_RIGHT(ic));
3861 if(IS_TRUE_SYMOP ( IC_RESULT(ic))) {
3862 debugAopGet (" result:", IC_RESULT (ic));
3863 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3864 // pic16_allocDirReg(IC_RESULT(ic));
3868 if (POINTER_SET (ic))
3869 debugLog (" %d - Pointer set\n", __LINE__);
3871 /* Look for two subsequent iCodes with */
3873 /* _c = iTemp & op; */
3874 /* and replace them by */
3877 if ((ic->op == BITWISEAND || ic->op == '|' || ic->op == '^')
3879 && ic->prev->op == '='
3880 && IS_ITEMP (IC_LEFT (ic))
3881 && IC_LEFT (ic) == IC_RESULT (ic->prev)
3882 && isOperandEqual (IC_RESULT(ic), IC_RIGHT(ic->prev)))
3884 iCode* ic_prev = ic->prev;
3885 symbol* prev_result_sym = OP_SYMBOL (IC_RESULT (ic_prev));
3887 ReplaceOpWithCheaperOp (&IC_LEFT (ic), IC_RESULT (ic));
3888 if (IC_RESULT (ic_prev) != IC_RIGHT (ic)) {
3889 bitVectUnSetBit (OP_USES (IC_RESULT (ic_prev)), ic->key);
3890 if (/*IS_ITEMP (IC_RESULT (ic_prev)) && */
3891 prev_result_sym->liveTo == ic->seq)
3893 prev_result_sym->liveTo = ic_prev->seq;
3896 bitVectSetBit (OP_USES (IC_RESULT (ic)), ic->key);
3898 bitVectSetBit (ic->rlive, IC_RESULT (ic)->key);
3900 if (bitVectIsZero (OP_USES (IC_RESULT (ic_prev)))) {
3901 bitVectUnSetBit (ic->rlive, IC_RESULT (ic)->key);
3902 bitVectUnSetBit (OP_DEFS (IC_RESULT (ic_prev)), ic_prev->key);
3903 remiCodeFromeBBlock (ebp, ic_prev);
3904 hTabDeleteItem (&iCodehTab, ic_prev->key, ic_prev, DELETE_ITEM, NULL);
3908 /* if this is an itemp & result of a address of a true sym
3909 then mark this as rematerialisable */
3910 if (ic->op == ADDRESS_OF &&
3911 IS_ITEMP (IC_RESULT (ic)) &&
3912 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3913 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3914 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3917 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3919 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3920 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3921 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3925 /* if straight assignment then carry remat flag if
3926 this is the only definition */
3927 if (ic->op == '=' &&
3928 !POINTER_SET (ic) &&
3929 IS_SYMOP (IC_RIGHT (ic)) &&
3930 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3931 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3933 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3935 OP_SYMBOL (IC_RESULT (ic))->remat =
3936 OP_SYMBOL (IC_RIGHT (ic))->remat;
3937 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3938 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3941 /* if this is a +/- operation with a rematerizable
3942 then mark this as rematerializable as well */
3943 if ((ic->op == '+' || ic->op == '-') &&
3944 (IS_SYMOP (IC_LEFT (ic)) &&
3945 IS_ITEMP (IC_RESULT (ic)) &&
3946 OP_SYMBOL (IC_LEFT (ic))->remat &&
3947 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3948 IS_OP_LITERAL (IC_RIGHT (ic))))
3950 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3952 operandLitValue (IC_RIGHT (ic));
3953 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3954 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3955 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3958 /* mark the pointer usages */
3959 if (POINTER_SET (ic))
3961 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3962 debugLog (" marking as a pointer (set) =>");
3963 debugAopGet (" result:", IC_RESULT (ic));
3965 if (POINTER_GET (ic))
3967 if(IS_SYMOP(IC_LEFT(ic))) {
3968 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3969 debugLog (" marking as a pointer (get) =>");
3970 debugAopGet (" left:", IC_LEFT (ic));
3974 //debugLog(" %d %s\n", __LINE__, __FUNCTION__);
3978 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3979 /* if we are using a symbol on the stack
3980 then we should say pic16_ptrRegReq */
3981 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3982 pic16_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3983 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3984 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3985 pic16_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3986 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3990 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3991 if (IS_SYMOP (IC_LEFT (ic)))
3992 pic16_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3993 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3994 if (IS_SYMOP (IC_RIGHT (ic)))
3995 pic16_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3996 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3997 if (IS_SYMOP (IC_RESULT (ic)))
3998 pic16_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3999 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
4002 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic16_ptrRegReq);
4006 /* if the condition of an if instruction
4007 is defined in the previous instruction then
4008 mark the itemp as a conditional */
4009 if ((IS_CONDITIONAL (ic) ||
4010 ((ic->op == BITWISEAND ||
4013 isBitwiseOptimizable (ic))) &&
4014 ic->next && ic->next->op == IFX &&
4015 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
4016 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
4019 debugLog (" %d\n", __LINE__);
4020 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
4024 debugLog(" %d\n", __LINE__);
4026 #ifndef NO_packRegsForSupport
4027 /* reduce for support function calls */
4028 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
4029 packRegsForSupport (ic, ebp);
4032 /* if a parameter is passed, it's in W, so we may not
4033 need to place a copy in a register */
4034 if (ic->op == RECEIVE)
4035 packForReceive (ic, ebp);
4037 #ifndef NO_packRegsForOneuse
4038 /* some cases the redundant moves can
4039 can be eliminated for return statements */
4040 if ((ic->op == RETURN || ic->op == SEND) &&
4041 !isOperandInFarSpace (IC_LEFT (ic)) &&
4043 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
4046 #ifndef NO_packRegsForOneuse
4047 /* if pointer set & left has a size more than
4048 one and right is not in far space */
4049 if (POINTER_SET (ic) &&
4050 !isOperandInFarSpace (IC_RIGHT (ic)) &&
4051 !OP_SYMBOL (IC_RESULT (ic))->remat &&
4052 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
4053 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
4055 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
4058 #ifndef NO_packRegsForOneuse
4059 /* if pointer get */
4060 if (POINTER_GET (ic) &&
4061 !isOperandInFarSpace (IC_RESULT (ic)) &&
4062 !OP_SYMBOL (IC_LEFT (ic))->remat &&
4063 !IS_OP_RUONLY (IC_RESULT (ic)) &&
4064 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
4066 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
4067 debugLog("%d - return from packRegsForOneuse\n", __LINE__);
4070 #ifndef NO_cast_peep
4071 /* if this is cast for intergral promotion then
4072 check if only use of the definition of the
4073 operand being casted/ if yes then replace
4074 the result of that arithmetic operation with
4075 this result and get rid of the cast */
4076 if (ic->op == CAST) {
4078 sym_link *fromType = operandType (IC_RIGHT (ic));
4079 sym_link *toType = operandType (IC_LEFT (ic));
4081 debugLog (" %d - casting\n", __LINE__);
4083 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
4084 getSize (fromType) != getSize (toType)) {
4087 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
4090 if (IS_ARITHMETIC_OP (dic)) {
4091 debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
4093 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
4094 IC_RESULT (dic) = IC_RESULT (ic);
4095 remiCodeFromeBBlock (ebp, ic);
4096 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
4097 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
4098 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
4102 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
4106 /* if the type from and type to are the same
4107 then if this is the only use then packit */
4108 if (compareType (operandType (IC_RIGHT (ic)),
4109 operandType (IC_LEFT (ic))) == 1) {
4111 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
4114 debugLog(" %d\n", __LINE__);
4116 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
4117 IC_RESULT (dic) = IC_RESULT (ic);
4118 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
4119 remiCodeFromeBBlock (ebp, ic);
4120 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
4121 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
4130 /* there are some problems with packing variables
4131 * it seems that the live range estimator doesn't
4132 * estimate correctly the liveranges of some symbols */
4135 iTempNN := (some variable in farspace) V1
4140 if (ic->op == IPUSH)
4142 packForPush (ic, ebp);
4146 #ifndef NO_packRegsForAccUse
4147 /* pack registers for accumulator use, when the
4148 result of an arithmetic or bit wise operation
4149 has only one use, that use is immediately following
4150 the defintion and the using iCode has only one
4151 operand or has two operands but one is literal &
4152 the result of that operation is not on stack then
4153 we can leave the result of this operation in acc:b
4155 if ((IS_ARITHMETIC_OP (ic)
4157 || IS_BITWISE_OP (ic)
4159 || ic->op == LEFT_OP || ic->op == RIGHT_OP
4162 IS_ITEMP (IC_RESULT (ic)) &&
4163 getSize (operandType (IC_RESULT (ic))) <= 1)
4165 packRegsForAccUse (ic);
4172 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4176 if (!pic16_ralloc_debug || !debugF)
4179 for (i = 0; i < count; i++)
4181 fprintf (debugF, "\n----------------------------------------------------------------\n");
4182 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4183 ebbs[i]->entryLabel->name,
4186 ebbs[i]->isLastInLoop);
4187 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4192 fprintf (debugF, "visited %d : hasFcall = %d\n",
4196 fprintf (debugF, "\ndefines bitVector :");
4197 bitVectDebugOn (ebbs[i]->defSet, debugF);
4198 fprintf (debugF, "\nlocal defines bitVector :");
4199 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4200 fprintf (debugF, "\npointers Set bitvector :");
4201 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4202 fprintf (debugF, "\nin pointers Set bitvector :");
4203 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4204 fprintf (debugF, "\ninDefs Set bitvector :");
4205 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4206 fprintf (debugF, "\noutDefs Set bitvector :");
4207 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4208 fprintf (debugF, "\nusesDefs Set bitvector :");
4209 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4210 fprintf (debugF, "\n----------------------------------------------------------------\n");
4211 printiCChain (ebbs[i]->sch, debugF);
4214 /*-----------------------------------------------------------------*/
4215 /* pic16_assignRegisters - assigns registers to each live range as need */
4216 /*-----------------------------------------------------------------*/
4218 pic16_assignRegisters (eBBlock ** ebbs, int count)
4223 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4224 debugLog ("\nebbs before optimizing:\n");
4225 dumpEbbsToDebug (ebbs, count);
4227 _inRegAllocator = 1;
4229 setToNull ((void *) &_G.funcrUsed);
4230 pic16_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4233 /* change assignments this will remove some
4234 live ranges reducing some register pressure */
4235 for (i = 0; i < count; i++)
4236 pic16_packRegisters (ebbs[i]);
4243 debugLog("dir registers allocated so far:\n");
4244 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4247 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4248 // fprintf(stderr, " -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4249 reg = hTabNextItem(dynDirectRegNames, &hkey);
4254 /* liveranges probably changed by register packing
4255 so we compute them again */
4256 recomputeLiveRanges (ebbs, count);
4258 if (options.dump_pack)
4259 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4261 /* first determine for each live range the number of
4262 registers & the type of registers required for each */
4265 /* start counting function temporary registers from zero */
4268 /* and serially allocate registers */
4269 serialRegAssign (ebbs, count);
4272 debugLog ("ebbs after serialRegAssign:\n");
4273 dumpEbbsToDebug (ebbs, count);
4276 //pic16_freeAllRegs();
4278 /* if stack was extended then tell the user */
4281 /* werror(W_TOOMANY_SPILS,"stack", */
4282 /* _G.stackExtend,currFunc->name,""); */
4288 /* werror(W_TOOMANY_SPILS,"data space", */
4289 /* _G.dataExtend,currFunc->name,""); */
4293 /* after that create the register mask
4294 for each of the instruction */
4295 createRegMask (ebbs, count);
4297 /* redo that offsets for stacked automatic variables */
4298 redoStackOffsets ();
4300 if (options.dump_rassgn)
4301 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4303 /* now get back the chain */
4304 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4306 debugLog ("ebbs after optimizing:\n");
4307 dumpEbbsToDebug (ebbs, count);
4309 _inRegAllocator = 0;
4313 /* free up any _G.stackSpil locations allocated */
4314 applyToSet (_G.stackSpil, deallocStackSpil);
4316 setToNull ((void *) &_G.stackSpil);
4317 setToNull ((void *) &_G.spiltSet);
4318 /* mark all registers as free */
4319 pic16_freeAllRegs ();
4322 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");