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 /* if it does not need or is spilt
2279 or is already assigned to registers
2280 or will not live beyond this instructions */
2283 bitVectBitValue (_G.regAssigned, sym->key) ||
2284 sym->liveTo <= ic->seq)
2287 /* if some liverange has been spilt at the block level
2288 and this one live beyond this block then spil this
2290 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2295 /* if trying to allocate this will cause
2296 a spill and there is nothing to spill
2297 or this one is rematerializable then
2299 willCS = willCauseSpill (sym->nRegs, sym->regType);
2300 spillable = computeSpillable (ic);
2302 (willCS && bitVectIsZero (spillable)))
2310 /* If the live range preceeds the point of definition
2311 then ideally we must take into account registers that
2312 have been allocated after sym->liveFrom but freed
2313 before ic->seq. This is complicated, so spill this
2314 symbol instead and let fillGaps handle the allocation. */
2315 if (sym->liveFrom < ic->seq)
2321 /* if it has a spillocation & is used less than
2322 all other live ranges then spill this */
2324 if (sym->usl.spillLoc) {
2325 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2326 allLRs, ebbs[i], ic));
2327 if (leastUsed && leastUsed->used > sym->used) {
2332 /* if none of the liveRanges have a spillLocation then better
2333 to spill this one than anything else already assigned to registers */
2334 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2335 /* if this is local to this block then we might find a block spil */
2336 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2344 if (ic->op == RECEIVE)
2345 debugLog ("When I get clever, I'll optimize the receive logic\n");
2347 if(POINTER_GET(ic) && IS_BITFIELD(getSpec(operandType(IC_RESULT(ic))))
2348 && (SPEC_BLEN(getSpec(operandType(IC_RESULT(ic))))==1)
2349 && (ic->next->op == IFX)
2350 && (OP_LIVETO(IC_RESULT(ic)) == ic->next->seq)) {
2352 /* skip register allocation since none will be used */
2353 for(j=0;j<sym->nRegs;j++)
2354 sym->regs[j] = newReg(REG_TMP, PO_GPR_TEMP, 0, "bad", 1, 0, NULL);
2355 // OP_SYMBOL(IC_RESULT(ic))->nRegs = 0;
2360 /* if we need ptr regs for the right side
2362 if (POINTER_GET (ic) && IS_SYMOP( IC_LEFT(ic) ) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2363 <= (unsigned) PTRSIZE)
2368 /* else we assign registers to it */
2369 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2372 bitVectDebugOn(_G.regAssigned, debugF);
2374 for (j = 0; j < sym->nRegs; j++)
2376 if (sym->regType == REG_PTR)
2377 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2379 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2381 /* if the allocation falied which means
2382 this was spilt then break */
2386 debugLog (" %d - \n", __LINE__);
2388 /* if it shares registers with operands make sure
2389 that they are in the same position */
2390 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2391 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2392 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2393 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2394 /* do the same for the right operand */
2395 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2396 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2397 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2398 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2400 debugLog (" %d - \n", __LINE__);
2403 debugLog (" %d - \n", __LINE__);
2412 /* Check for and fix any problems with uninitialized operands */
2413 for (i = 0; i < count; i++)
2417 if (ebbs[i]->noPath &&
2418 (ebbs[i]->entryLabel != entryLabel &&
2419 ebbs[i]->entryLabel != returnLabel))
2422 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2429 verifyRegsAssigned (IC_COND (ic), ic);
2433 if (ic->op == JUMPTABLE)
2435 verifyRegsAssigned (IC_JTCOND (ic), ic);
2439 verifyRegsAssigned (IC_RESULT (ic), ic);
2440 verifyRegsAssigned (IC_LEFT (ic), ic);
2441 verifyRegsAssigned (IC_RIGHT (ic), ic);
2447 /*-----------------------------------------------------------------*/
2448 /* rUmaskForOp :- returns register mask for an operand */
2449 /*-----------------------------------------------------------------*/
2451 rUmaskForOp (operand * op)
2457 debugLog ("%s\n", __FUNCTION__);
2458 /* only temporaries are assigned registers */
2462 sym = OP_SYMBOL (op);
2464 /* if spilt or no registers assigned to it
2466 if (sym->isspilt || !sym->nRegs)
2469 rumask = newBitVect (pic16_nRegs);
2471 for (j = 0; j < sym->nRegs; j++)
2473 rumask = bitVectSetBit (rumask,
2474 sym->regs[j]->rIdx);
2480 /*-----------------------------------------------------------------*/
2481 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2482 /*-----------------------------------------------------------------*/
2484 regsUsedIniCode (iCode * ic)
2486 bitVect *rmask = newBitVect (pic16_nRegs);
2488 debugLog ("%s\n", __FUNCTION__);
2489 /* do the special cases first */
2492 rmask = bitVectUnion (rmask,
2493 rUmaskForOp (IC_COND (ic)));
2497 /* for the jumptable */
2498 if (ic->op == JUMPTABLE)
2500 rmask = bitVectUnion (rmask,
2501 rUmaskForOp (IC_JTCOND (ic)));
2506 /* of all other cases */
2508 rmask = bitVectUnion (rmask,
2509 rUmaskForOp (IC_LEFT (ic)));
2513 rmask = bitVectUnion (rmask,
2514 rUmaskForOp (IC_RIGHT (ic)));
2517 rmask = bitVectUnion (rmask,
2518 rUmaskForOp (IC_RESULT (ic)));
2524 /*-----------------------------------------------------------------*/
2525 /* createRegMask - for each instruction will determine the regsUsed */
2526 /*-----------------------------------------------------------------*/
2528 createRegMask (eBBlock ** ebbs, int count)
2532 debugLog ("%s\n", __FUNCTION__);
2533 /* for all blocks */
2534 for (i = 0; i < count; i++)
2538 if (ebbs[i]->noPath &&
2539 (ebbs[i]->entryLabel != entryLabel &&
2540 ebbs[i]->entryLabel != returnLabel))
2543 /* for all instructions */
2544 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2549 if (SKIP_IC2 (ic) || !ic->rlive)
2552 /* first mark the registers used in this
2554 ic->rUsed = regsUsedIniCode (ic);
2555 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2557 /* now create the register mask for those
2558 registers that are in use : this is a
2559 super set of ic->rUsed */
2560 ic->rMask = newBitVect (pic16_nRegs + 1);
2562 /* for all live Ranges alive at this point */
2563 for (j = 1; j < ic->rlive->size; j++)
2568 /* if not alive then continue */
2569 if (!bitVectBitValue (ic->rlive, j))
2572 /* find the live range we are interested in */
2573 if (!(sym = hTabItemWithKey (liveRanges, j)))
2575 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2576 "createRegMask cannot find live range");
2580 /* if no register assigned to it */
2581 if (!sym->nRegs || sym->isspilt)
2584 /* for all the registers allocated to it */
2585 for (k = 0; k < sym->nRegs; k++)
2588 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2594 /*-----------------------------------------------------------------*/
2595 /* rematStr - returns the rematerialized string for a remat var */
2596 /*-----------------------------------------------------------------*/
2598 rematStr (symbol * sym)
2601 iCode *ic = sym->rematiCode;
2602 symbol *psym = NULL;
2604 debugLog ("%s\n", __FUNCTION__);
2606 //printf ("%s\n", s);
2608 /* if plus or minus print the right hand side */
2610 if (ic->op == '+' || ic->op == '-') {
2612 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2614 sprintf (s, "(%s %c 0x%04x)",
2615 OP_SYMBOL (IC_LEFT (ric))->rname,
2617 (int) operandLitValue (IC_RIGHT (ic)));
2620 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2622 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2623 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2628 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2629 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2631 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2636 /*-----------------------------------------------------------------*/
2637 /* rematStr - returns the rematerialized string for a remat var */
2638 /*-----------------------------------------------------------------*/
2640 rematStr (symbol * sym)
2643 iCode *ic = sym->rematiCode;
2645 debugLog ("%s\n", __FUNCTION__);
2650 /* if plus or minus print the right hand side */
2652 if (ic->op == '+' || ic->op == '-') {
2653 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2656 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2660 if (ic->op == '+' || ic->op == '-')
2662 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2663 sprintf (s, "(%s %c 0x%04x)",
2664 OP_SYMBOL (IC_LEFT (ric))->rname,
2666 (int) operandLitValue (IC_RIGHT (ic)));
2669 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2671 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2675 /* we reached the end */
2676 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2680 printf ("%s\n", buffer);
2685 /*-----------------------------------------------------------------*/
2686 /* regTypeNum - computes the type & number of registers required */
2687 /*-----------------------------------------------------------------*/
2695 debugLog ("%s\n", __FUNCTION__);
2696 /* for each live range do */
2697 for (sym = hTabFirstItem (liveRanges, &k); sym;
2698 sym = hTabNextItem (liveRanges, &k)) {
2700 debugLog (" %d - %s\n", __LINE__, sym->rname);
2701 //fprintf(stderr," %d - %s\n", __LINE__, sym->rname);
2703 /* if used zero times then no registers needed */
2704 if ((sym->liveTo - sym->liveFrom) == 0)
2708 /* if the live range is a temporary */
2711 debugLog (" %d - itemp register\n", __LINE__);
2713 /* if the type is marked as a conditional */
2714 if (sym->regType == REG_CND)
2717 /* if used in return only then we don't
2719 if (sym->ruonly || sym->accuse) {
2720 if (IS_AGGREGATE (sym->type) || sym->isptr)
2721 sym->type = aggrToPtr (sym->type, FALSE);
2722 debugLog (" %d - no reg needed - used as a return\n", __LINE__);
2726 /* if the symbol has only one definition &
2727 that definition is a get_pointer and the
2728 pointer we are getting is rematerializable and
2731 if (bitVectnBitsOn (sym->defs) == 1 &&
2732 (ic = hTabItemWithKey (iCodehTab,
2733 bitVectFirstBit (sym->defs))) &&
2735 !IS_BITVAR (sym->etype) &&
2736 (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2738 if (ptrPseudoSymSafe (sym, ic)) {
2742 debugLog (" %d - \n", __LINE__);
2744 /* create a psuedo symbol & force a spil */
2745 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2746 psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2747 psym->type = sym->type;
2748 psym->etype = sym->etype;
2749 psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2750 strcpy (psym->rname, psym->name);
2752 sym->usl.spillLoc = psym;
2756 /* if in data space or idata space then try to
2757 allocate pointer register */
2761 /* if not then we require registers */
2762 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2763 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2764 getSize (sym->type));
2768 if(IS_PTR_CONST (sym->type)) {
2770 if(IS_CODEPTR (sym->type)) {
2772 // what IS this ???? (HJD)
2773 debugLog (" %d const pointer type requires %d registers, changing to 3\n",__LINE__,sym->nRegs); // patch 14
2774 sym->nRegs = 3; // patch 14
2777 if (sym->nRegs > 4) {
2778 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2779 printTypeChain (sym->type, stderr);
2780 fprintf (stderr, "\n");
2783 /* determine the type of register required */
2784 if (sym->nRegs == 1 &&
2785 IS_PTR (sym->type) &&
2787 sym->regType = REG_PTR;
2789 sym->regType = REG_GPR;
2792 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2796 /* for the first run we don't provide */
2797 /* registers for true symbols we will */
2798 /* see how things go */
2804 static DEFSETFUNC (markRegFree)
2806 ((regs *)item)->isFree = 1;
2811 DEFSETFUNC (pic16_deallocReg)
2813 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2814 ((regs *)item)->isFree = 1;
2815 ((regs *)item)->wasUsed = 0;
2819 /*-----------------------------------------------------------------*/
2820 /* freeAllRegs - mark all registers as free */
2821 /*-----------------------------------------------------------------*/
2823 pic16_freeAllRegs ()
2825 debugLog ("%s\n", __FUNCTION__);
2827 applyToSet(pic16_dynAllocRegs,markRegFree);
2828 applyToSet(pic16_dynStackRegs,markRegFree);
2831 /*-----------------------------------------------------------------*/
2832 /*-----------------------------------------------------------------*/
2834 pic16_deallocateAllRegs ()
2836 debugLog ("%s\n", __FUNCTION__);
2838 applyToSet(pic16_dynAllocRegs,pic16_deallocReg);
2842 /*-----------------------------------------------------------------*/
2843 /* deallocStackSpil - this will set the stack pointer back */
2844 /*-----------------------------------------------------------------*/
2846 DEFSETFUNC (deallocStackSpil)
2850 debugLog ("%s\n", __FUNCTION__);
2855 /*-----------------------------------------------------------------*/
2856 /* farSpacePackable - returns the packable icode for far variables */
2857 /*-----------------------------------------------------------------*/
2859 farSpacePackable (iCode * ic)
2863 debugLog ("%s\n", __FUNCTION__);
2864 /* go thru till we find a definition for the
2865 symbol on the right */
2866 for (dic = ic->prev; dic; dic = dic->prev)
2869 /* if the definition is a call then no */
2870 if ((dic->op == CALL || dic->op == PCALL) &&
2871 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2876 /* if shift by unknown amount then not */
2877 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2878 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2881 /* if pointer get and size > 1 */
2882 if (POINTER_GET (dic) &&
2883 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2886 if (POINTER_SET (dic) &&
2887 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2890 /* if any three is a true symbol in far space */
2891 if (IC_RESULT (dic) &&
2892 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2893 isOperandInFarSpace (IC_RESULT (dic)))
2896 if (IC_RIGHT (dic) &&
2897 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2898 isOperandInFarSpace (IC_RIGHT (dic)) &&
2899 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2902 if (IC_LEFT (dic) &&
2903 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2904 isOperandInFarSpace (IC_LEFT (dic)) &&
2905 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2908 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2910 if ((dic->op == LEFT_OP ||
2911 dic->op == RIGHT_OP ||
2913 IS_OP_LITERAL (IC_RIGHT (dic)))
2923 /*-----------------------------------------------------------------*/
2924 /* packRegsForAssign - register reduction for assignment */
2925 /*-----------------------------------------------------------------*/
2927 packRegsForAssign (iCode * ic, eBBlock * ebp)
2932 debugLog ("%d\t%s\n", __LINE__, __FUNCTION__);
2933 debugLog ("ic->op = %s\n", pic16_decodeOp( ic->op ) );
2934 debugAopGet (" result:", IC_RESULT (ic));
2935 debugAopGet (" left:", IC_LEFT (ic));
2936 debugAopGet (" right:", IC_RIGHT (ic));
2938 // fprintf(stderr, "%s:%d symbol = %s\n", __FILE__, __LINE__, OP_SYMBOL( IC_RESULT(ic))->name);
2940 debugLog(" %d - actuall processing\n", __LINE__ );
2942 if (!IS_ITEMP (IC_RESULT (ic))) {
2943 pic16_allocDirReg(IC_RESULT (ic));
2944 debugLog (" %d - result is not temp\n", __LINE__);
2947 // if(IS_VALOP(IC_RIGHT(ic)))return 0;
2949 /* See BUGLOG0001 - VR */
2951 if (!IS_ITEMP (IC_RIGHT (ic)) /*&& (!IS_PARM(IC_RESULT(ic)))*/) {
2952 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2953 pic16_allocDirReg(IC_RIGHT (ic));
2958 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2959 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2961 debugLog (" %d - not packing - right side fails \n", __LINE__);
2965 /* if the true symbol is defined in far space or on stack
2966 then we should not since this will increase register pressure */
2967 if (isOperandInFarSpace (IC_RESULT (ic)))
2969 if ((dic = farSpacePackable (ic)))
2976 /* find the definition of iTempNN scanning backwards if we find a
2977 a use of the true symbol before we find the definition then
2979 for (dic = ic->prev; dic; dic = dic->prev)
2982 /* if there is a function call and this is
2983 a parameter & not my parameter then don't pack it */
2984 if ((dic->op == CALL || dic->op == PCALL) &&
2985 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2986 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2988 debugLog (" %d - \n", __LINE__);
2997 debugLog("%d\tSearching for iTempNN\n", __LINE__);
2999 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3000 IS_OP_VOLATILE (IC_RESULT (dic)))
3002 debugLog (" %d - dic is VOLATILE \n", __LINE__);
3008 if( IS_SYMOP( IC_RESULT(dic)) &&
3009 IS_BITFIELD( OP_SYMBOL(IC_RESULT(dic))->etype ) ) {
3011 debugLog (" %d - result is bitfield\n", __LINE__);
3017 if (IS_SYMOP (IC_RESULT (dic)) &&
3018 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3020 /* A previous result was assigned to the same register - we'll our definition */
3021 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
3022 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3023 if (POINTER_SET (dic))
3029 if (IS_SYMOP (IC_RIGHT (dic)) &&
3030 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3031 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3033 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
3038 if (IS_SYMOP (IC_LEFT (dic)) &&
3039 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3040 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3042 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
3047 if (POINTER_SET (dic) &&
3048 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3050 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
3058 return 0; /* did not find */
3061 /* This code is taken from the hc08 port. Do not know
3062 * if it fits for pic16, but I leave it here just in case */
3064 /* if assignment then check that right is not a bit */
3065 if (ASSIGNMENT (dic) && !POINTER_SET (dic)) {
3066 sym_link *etype = operandType (IC_RIGHT (dic));
3068 if (IS_BITFIELD (etype)) {
3069 /* if result is a bit too then it's ok */
3070 etype = operandType (IC_RESULT (dic));
3071 if (!IS_BITFIELD (etype)) {
3072 debugLog(" %d bitfields\n");
3079 /* if the result is on stack or iaccess then it must be
3080 the same atleast one of the operands */
3081 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3082 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3084 /* the operation has only one symbol
3085 operator then we can pack */
3086 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3087 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3090 if (!((IC_LEFT (dic) &&
3091 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3093 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3097 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3098 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3099 /* found the definition */
3100 /* replace the result with the result of */
3101 /* this assignment and remove this assignment */
3102 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3103 IC_RESULT (dic) = IC_RESULT (ic);
3105 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3107 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3109 /* delete from liverange table also
3110 delete from all the points inbetween and the new
3112 for (sic = dic; sic != ic; sic = sic->next)
3114 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3115 if (IS_ITEMP (IC_RESULT (dic)))
3116 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3119 remiCodeFromeBBlock (ebp, ic);
3120 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3122 debugLog(" %d\n", __LINE__ );
3123 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3124 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3132 #define NO_packRegsForAccUse
3133 #define NO_packRegsForSupport
3134 #define NO_packRegsForOneuse
3135 #define NO_cast_peep
3140 #ifndef NO_packRegsForSupport
3141 /*-----------------------------------------------------------------*/
3142 /* findAssignToSym : scanning backwards looks for first assig found */
3143 /*-----------------------------------------------------------------*/
3145 findAssignToSym (operand * op, iCode * ic)
3149 debugLog ("%s\n", __FUNCTION__);
3150 for (dic = ic->prev; dic; dic = dic->prev)
3153 /* if definition by assignment */
3154 if (dic->op == '=' &&
3155 !POINTER_SET (dic) &&
3156 IC_RESULT (dic)->key == op->key
3157 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3161 /* we are interested only if defined in far space */
3162 /* or in stack space in case of + & - */
3164 /* if assigned to a non-symbol then return
3166 if (!IS_SYMOP (IC_RIGHT (dic)))
3169 /* if the symbol is in far space then
3171 if (isOperandInFarSpace (IC_RIGHT (dic)))
3174 /* for + & - operations make sure that
3175 if it is on the stack it is the same
3176 as one of the three operands */
3177 if ((ic->op == '+' || ic->op == '-') &&
3178 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3180 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3181 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3182 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3190 /* if we find an usage then we cannot delete it */
3191 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3194 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3197 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3201 /* now make sure that the right side of dic
3202 is not defined between ic & dic */
3205 iCode *sic = dic->next;
3207 for (; sic != ic; sic = sic->next)
3208 if (IC_RESULT (sic) &&
3209 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3220 #ifndef NO_packRegsForSupport
3221 /*-----------------------------------------------------------------*/
3222 /* packRegsForSupport :- reduce some registers for support calls */
3223 /*-----------------------------------------------------------------*/
3225 packRegsForSupport (iCode * ic, eBBlock * ebp)
3229 debugLog ("%s\n", __FUNCTION__);
3230 /* for the left & right operand :- look to see if the
3231 left was assigned a true symbol in far space in that
3232 case replace them */
3233 if (IS_ITEMP (IC_LEFT (ic)) &&
3234 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3236 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3242 debugAopGet ("removing left:", IC_LEFT (ic));
3244 /* found it we need to remove it from the
3246 for (sic = dic; sic != ic; sic = sic->next)
3247 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3249 IC_LEFT (ic)->operand.symOperand =
3250 IC_RIGHT (dic)->operand.symOperand;
3251 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3252 remiCodeFromeBBlock (ebp, dic);
3253 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3254 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3258 /* do the same for the right operand */
3261 IS_ITEMP (IC_RIGHT (ic)) &&
3262 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3264 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3270 /* if this is a subtraction & the result
3271 is a true symbol in far space then don't pack */
3272 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3274 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3275 if (IN_FARSPACE (SPEC_OCLS (etype)))
3279 debugAopGet ("removing right:", IC_RIGHT (ic));
3281 /* found it we need to remove it from the
3283 for (sic = dic; sic != ic; sic = sic->next)
3284 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3286 IC_RIGHT (ic)->operand.symOperand =
3287 IC_RIGHT (dic)->operand.symOperand;
3288 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3290 remiCodeFromeBBlock (ebp, dic);
3291 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3292 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3301 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3303 #ifndef NO_packRegsForOneuse
3304 /*-----------------------------------------------------------------*/
3305 /* packRegsForOneuse : - will reduce some registers for single Use */
3306 /*-----------------------------------------------------------------*/
3308 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3313 debugLog ("%s\n", __FUNCTION__);
3314 /* if returning a literal then do nothing */
3318 /* only upto 2 bytes since we cannot predict
3319 the usage of b, & acc */
3320 if (getSize (operandType (op)) > (pic16_fReturnSizePic - 3) && /* was 2, changed to 3 -- VR */
3325 /* this routine will mark the a symbol as used in one
3326 instruction use only && if the definition is local
3327 (ie. within the basic block) && has only one definition &&
3328 that definition is either a return value from a
3329 function or does not contain any variables in
3331 uses = bitVectCopy (OP_USES (op));
3332 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3333 if (!bitVectIsZero (uses)) /* has other uses */
3336 /* if it has only one defintion */
3337 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3338 return NULL; /* has more than one definition */
3340 /* get that definition */
3342 hTabItemWithKey (iCodehTab,
3343 bitVectFirstBit (OP_DEFS (op)))))
3346 /* found the definition now check if it is local */
3347 if (dic->seq < ebp->fSeq ||
3348 dic->seq > ebp->lSeq)
3349 return NULL; /* non-local */
3351 /* now check if it is the return from
3353 if (dic->op == CALL || dic->op == PCALL)
3355 if (ic->op != SEND && ic->op != RETURN &&
3356 !POINTER_SET(ic) && !POINTER_GET(ic))
3358 OP_SYMBOL (op)->ruonly = 1;
3365 /* otherwise check that the definition does
3366 not contain any symbols in far space */
3367 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3368 isOperandInFarSpace (IC_RIGHT (dic)) ||
3369 IS_OP_RUONLY (IC_LEFT (ic)) ||
3370 IS_OP_RUONLY (IC_RIGHT (ic)))
3375 /* if pointer set then make sure the pointer
3377 if (POINTER_SET (dic) &&
3378 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3381 if (POINTER_GET (dic) &&
3382 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3387 /* also make sure the intervenening instructions
3388 don't have any thing in far space */
3389 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3392 /* if there is an intervening function call then no */
3393 if (dic->op == CALL || dic->op == PCALL)
3395 /* if pointer set then make sure the pointer
3397 if (POINTER_SET (dic) &&
3398 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3401 if (POINTER_GET (dic) &&
3402 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3405 /* if address of & the result is remat then okay */
3406 if (dic->op == ADDRESS_OF &&
3407 OP_SYMBOL (IC_RESULT (dic))->remat)
3410 /* if operand has size of three or more & this
3411 operation is a '*','/' or '%' then 'b' may
3413 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3414 getSize (operandType (op)) >= 3)
3417 /* if left or right or result is in far space */
3418 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3419 isOperandInFarSpace (IC_RIGHT (dic)) ||
3420 isOperandInFarSpace (IC_RESULT (dic)) ||
3421 IS_OP_RUONLY (IC_LEFT (dic)) ||
3422 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3423 IS_OP_RUONLY (IC_RESULT (dic)))
3429 OP_SYMBOL (op)->ruonly = 1;
3436 /*-----------------------------------------------------------------*/
3437 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3438 /*-----------------------------------------------------------------*/
3440 isBitwiseOptimizable (iCode * ic)
3442 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3443 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3445 debugLog ("%s\n", __FUNCTION__);
3446 /* bitwise operations are considered optimizable
3447 under the following conditions (Jean-Louis VERN)
3459 if (IS_LITERAL (rtype) ||
3460 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3467 #ifndef NO_packRegsForAccUse
3469 /*-----------------------------------------------------------------*/
3470 /* packRegsForAccUse - pack registers for acc use */
3471 /*-----------------------------------------------------------------*/
3473 packRegsForAccUse (iCode * ic)
3477 debugLog ("%s\n", __FUNCTION__);
3479 /* if this is an aggregate, e.g. a one byte char array */
3480 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3483 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3485 /* if + or - then it has to be one byte result */
3486 if ((ic->op == '+' || ic->op == '-')
3487 && getSize (operandType (IC_RESULT (ic))) > 1)
3490 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3491 /* if shift operation make sure right side is not a literal */
3492 if (ic->op == RIGHT_OP &&
3493 (isOperandLiteral (IC_RIGHT (ic)) ||
3494 getSize (operandType (IC_RESULT (ic))) > 1))
3497 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3498 if (ic->op == LEFT_OP &&
3499 (isOperandLiteral (IC_RIGHT (ic)) ||
3500 getSize (operandType (IC_RESULT (ic))) > 1))
3503 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3504 if (IS_BITWISE_OP (ic) &&
3505 getSize (operandType (IC_RESULT (ic))) > 1)
3509 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3510 /* has only one definition */
3511 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3514 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3515 /* has only one use */
3516 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3519 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3520 /* and the usage immediately follows this iCode */
3521 if (!(uic = hTabItemWithKey (iCodehTab,
3522 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3525 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3526 if (ic->next != uic)
3529 /* if it is a conditional branch then we definitely can */
3533 if (uic->op == JUMPTABLE)
3536 /* if the usage is not is an assignment
3537 or an arithmetic / bitwise / shift operation then not */
3538 if (POINTER_SET (uic) &&
3539 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3542 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3543 if (uic->op != '=' &&
3544 !IS_ARITHMETIC_OP (uic) &&
3545 !IS_BITWISE_OP (uic) &&
3546 uic->op != LEFT_OP &&
3547 uic->op != RIGHT_OP)
3550 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3551 /* if used in ^ operation then make sure right is not a
3553 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3556 /* if shift operation make sure right side is not a literal */
3557 if (uic->op == RIGHT_OP &&
3558 (isOperandLiteral (IC_RIGHT (uic)) ||
3559 getSize (operandType (IC_RESULT (uic))) > 1))
3562 if (uic->op == LEFT_OP &&
3563 (isOperandLiteral (IC_RIGHT (uic)) ||
3564 getSize (operandType (IC_RESULT (uic))) > 1))
3567 /* make sure that the result of this icode is not on the
3568 stack, since acc is used to compute stack offset */
3569 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3570 OP_SYMBOL (IC_RESULT (uic))->onStack)
3573 /* if either one of them in far space then we cannot */
3574 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3575 isOperandInFarSpace (IC_LEFT (uic))) ||
3576 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3577 isOperandInFarSpace (IC_RIGHT (uic))))
3580 /* if the usage has only one operand then we can */
3581 if (IC_LEFT (uic) == NULL ||
3582 IC_RIGHT (uic) == NULL)
3585 /* make sure this is on the left side if not
3586 a '+' since '+' is commutative */
3587 if (ic->op != '+' &&
3588 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3592 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3593 /* if one of them is a literal then we can */
3594 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3595 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3596 (getSize (operandType (IC_RESULT (uic))) <= 1))
3598 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3603 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3604 /* if the other one is not on stack then we can */
3605 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3606 (IS_ITEMP (IC_RIGHT (uic)) ||
3607 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3608 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3611 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3612 (IS_ITEMP (IC_LEFT (uic)) ||
3613 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3614 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3620 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3621 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3628 /*-----------------------------------------------------------------*/
3629 /* packForPush - hueristics to reduce iCode for pushing */
3630 /*-----------------------------------------------------------------*/
3632 packForReceive (iCode * ic, eBBlock * ebp)
3636 debugLog ("%s\n", __FUNCTION__);
3637 debugAopGet (" result:", IC_RESULT (ic));
3638 debugAopGet (" left:", IC_LEFT (ic));
3639 debugAopGet (" right:", IC_RIGHT (ic));
3644 for (dic = ic->next; dic; dic = dic->next)
3646 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3647 debugLog (" used on left\n");
3648 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3649 debugLog (" used on right\n");
3650 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3651 debugLog (" used on result\n");
3653 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3654 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3658 debugLog (" hey we can remove this unnecessary assign\n");
3660 /*-----------------------------------------------------------------*/
3661 /* packForPush - hueristics to reduce iCode for pushing */
3662 /*-----------------------------------------------------------------*/
3664 packForPush (iCode * ic, eBBlock * ebp)
3668 debugLog ("%s\n", __FUNCTION__);
3669 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3676 n1 = bitVectnBitsOn( OP_DEFS(IC_LEFT(ic)));
3677 n2 = bitVectnBitsOn( OP_USES(IC_LEFT(ic)));
3678 debugf3("defs: %d\tuses: %d\t%s\n", n1, n2, printILine(ic));
3679 debugf2("IC_LEFT(ic): from %d to %d\n", OP_LIVEFROM(IC_LEFT(ic)), OP_LIVETO(IC_LEFT(ic)));
3683 /* must have only definition & one usage */
3684 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3685 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3688 /* find the definition */
3689 if (!(dic = hTabItemWithKey (iCodehTab,
3690 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3693 /* if definition is not assignment,
3694 * or is not pointer (because pointer might have changed) */
3695 if (dic->op != '=' || POINTER_SET (dic))
3698 /* we must ensure that we can use the delete the assignment,
3699 * because the source might have been modified in between.
3700 * Until I know how to fix this, I'll use the adhoc fix
3701 * to check the liveranges */
3702 if((OP_LIVEFROM(IC_RIGHT(dic))==0) || (OP_LIVETO(IC_RIGHT(dic))==0))
3704 // debugf2("IC_RIGHT(dic): from %d to %d\n", OP_LIVEFROM(IC_RIGHT(dic)), OP_LIVETO(IC_RIGHT(dic)));
3708 /* we now we know that it has one & only one def & use
3709 and the that the definition is an assignment */
3710 IC_LEFT (ic) = IC_RIGHT (dic);
3712 debugf("remiCodeFromeBBlock: %s\n", printILine(dic));
3714 remiCodeFromeBBlock (ebp, dic);
3715 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3716 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3719 static void printSymType(char * str, sym_link *sl)
3721 if(!pic16_ralloc_debug)return;
3723 debugLog (" %s Symbol type: ",str);
3724 printTypeChain( sl, debugF);
3728 /*-----------------------------------------------------------------*/
3729 /* some debug code to print the symbol S_TYPE. Note that
3730 * the function checkSClass in src/SDCCsymt.c dinks with
3731 * the S_TYPE in ways the PIC port doesn't fully like...*/
3732 /*-----------------------------------------------------------------*/
3733 static void isData(sym_link *sl)
3737 if(!pic16_ralloc_debug)return;
3744 for ( ; sl; sl=sl->next) {
3746 switch (SPEC_SCLS(sl)) {
3747 case S_DATA: fprintf (of, "data "); break;
3748 case S_XDATA: fprintf (of, "xdata "); break;
3749 case S_SFR: fprintf (of, "sfr "); break;
3750 case S_SBIT: fprintf (of, "sbit "); break;
3751 case S_CODE: fprintf (of, "code "); break;
3752 case S_IDATA: fprintf (of, "idata "); break;
3753 case S_PDATA: fprintf (of, "pdata "); break;
3754 case S_LITERAL: fprintf (of, "literal "); break;
3755 case S_STACK: fprintf (of, "stack "); break;
3756 case S_XSTACK: fprintf (of, "xstack "); break;
3757 case S_BIT: fprintf (of, "bit "); break;
3758 case S_EEPROM: fprintf (of, "eeprom "); break;
3766 /*--------------------------------------------------------------------*/
3767 /* pic16_packRegisters - does some transformations to reduce */
3768 /* register pressure */
3770 /*--------------------------------------------------------------------*/
3772 pic16_packRegisters (eBBlock * ebp)
3777 debugLog ("%s\n", __FUNCTION__);
3783 /* look for assignments of the form */
3784 /* iTempNN = TRueSym (someoperation) SomeOperand */
3786 /* TrueSym := iTempNN:1 */
3787 for (ic = ebp->sch; ic; ic = ic->next)
3789 // debugLog("%d\n", __LINE__);
3790 /* find assignment of the form TrueSym := iTempNN:1 */
3791 if ( (ic->op == '=') && !POINTER_SET (ic) ) // patch 11
3792 change += packRegsForAssign (ic, ebp);
3796 if (POINTER_SET (ic))
3797 debugLog ("pointer is set\n");
3798 debugAopGet (" result:", IC_RESULT (ic));
3799 debugAopGet (" left:", IC_LEFT (ic));
3800 debugAopGet (" right:", IC_RIGHT (ic));
3809 for (ic = ebp->sch; ic; ic = ic->next) {
3811 if(IS_SYMOP ( IC_LEFT(ic))) {
3812 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3814 debugAopGet ("x left:", IC_LEFT (ic));
3816 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3818 if(IS_CODEPTR(OP_SYMBOL(IC_LEFT(ic))->type))
3820 debugLog (" is a pointer\n");
3822 if(IS_PTR(OP_SYMBOL(IC_LEFT(ic))->type))
3823 debugLog (" is a ptr\n");
3825 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3826 debugLog (" is volatile\n");
3830 if(IS_OP_VOLATILE(IC_LEFT(ic))) {
3831 debugLog (" %d - left is not temp, allocating\n", __LINE__);
3832 pic16_allocDirReg(IC_LEFT (ic));
3835 printSymType("c ", OP_SYMBOL(IC_LEFT(ic))->type);
3838 if(IS_SYMOP ( IC_RIGHT(ic))) {
3839 debugAopGet (" right:", IC_RIGHT (ic));
3840 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3843 if(IS_SYMOP ( IC_RESULT(ic))) {
3844 debugAopGet (" result:", IC_RESULT (ic));
3845 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3848 if(IS_TRUE_SYMOP ( IC_RIGHT(ic))) {
3849 debugAopGet (" right:", IC_RIGHT (ic));
3850 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3851 // pic16_allocDirReg(IC_RIGHT(ic));
3854 if(IS_TRUE_SYMOP ( IC_RESULT(ic))) {
3855 debugAopGet (" result:", IC_RESULT (ic));
3856 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3857 // pic16_allocDirReg(IC_RESULT(ic));
3861 if (POINTER_SET (ic))
3862 debugLog (" %d - Pointer set\n", __LINE__);
3864 /* Look for two subsequent iCodes with */
3866 /* _c = iTemp & op; */
3867 /* and replace them by */
3870 if ((ic->op == BITWISEAND || ic->op == '|' || ic->op == '^')
3872 && ic->prev->op == '='
3873 && IS_ITEMP (IC_LEFT (ic))
3874 && IC_LEFT (ic) == IC_RESULT (ic->prev)
3875 && isOperandEqual (IC_RESULT(ic), IC_RIGHT(ic->prev)))
3877 iCode* ic_prev = ic->prev;
3878 symbol* prev_result_sym = OP_SYMBOL (IC_RESULT (ic_prev));
3880 ReplaceOpWithCheaperOp (&IC_LEFT (ic), IC_RESULT (ic));
3881 if (IC_RESULT (ic_prev) != IC_RIGHT (ic)) {
3882 bitVectUnSetBit (OP_USES (IC_RESULT (ic_prev)), ic->key);
3883 if (/*IS_ITEMP (IC_RESULT (ic_prev)) && */
3884 prev_result_sym->liveTo == ic->seq)
3886 prev_result_sym->liveTo = ic_prev->seq;
3889 bitVectSetBit (OP_USES (IC_RESULT (ic)), ic->key);
3891 bitVectSetBit (ic->rlive, IC_RESULT (ic)->key);
3893 if (bitVectIsZero (OP_USES (IC_RESULT (ic_prev)))) {
3894 bitVectUnSetBit (ic->rlive, IC_RESULT (ic)->key);
3895 bitVectUnSetBit (OP_DEFS (IC_RESULT (ic_prev)), ic_prev->key);
3896 remiCodeFromeBBlock (ebp, ic_prev);
3897 hTabDeleteItem (&iCodehTab, ic_prev->key, ic_prev, DELETE_ITEM, NULL);
3901 /* if this is an itemp & result of a address of a true sym
3902 then mark this as rematerialisable */
3903 if (ic->op == ADDRESS_OF &&
3904 IS_ITEMP (IC_RESULT (ic)) &&
3905 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3906 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3907 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3910 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3912 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3913 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3914 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3918 /* if straight assignment then carry remat flag if
3919 this is the only definition */
3920 if (ic->op == '=' &&
3921 !POINTER_SET (ic) &&
3922 IS_SYMOP (IC_RIGHT (ic)) &&
3923 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3924 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3926 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3928 OP_SYMBOL (IC_RESULT (ic))->remat =
3929 OP_SYMBOL (IC_RIGHT (ic))->remat;
3930 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3931 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3934 /* if this is a +/- operation with a rematerizable
3935 then mark this as rematerializable as well */
3936 if ((ic->op == '+' || ic->op == '-') &&
3937 (IS_SYMOP (IC_LEFT (ic)) &&
3938 IS_ITEMP (IC_RESULT (ic)) &&
3939 OP_SYMBOL (IC_LEFT (ic))->remat &&
3940 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3941 IS_OP_LITERAL (IC_RIGHT (ic))))
3943 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3945 operandLitValue (IC_RIGHT (ic));
3946 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3947 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3948 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3951 /* mark the pointer usages */
3952 if (POINTER_SET (ic))
3954 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3955 debugLog (" marking as a pointer (set) =>");
3956 debugAopGet (" result:", IC_RESULT (ic));
3958 if (POINTER_GET (ic))
3960 if(IS_SYMOP(IC_LEFT(ic))) {
3961 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3962 debugLog (" marking as a pointer (get) =>");
3963 debugAopGet (" left:", IC_LEFT (ic));
3967 //debugLog(" %d %s\n", __LINE__, __FUNCTION__);
3971 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3972 /* if we are using a symbol on the stack
3973 then we should say pic16_ptrRegReq */
3974 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3975 pic16_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3976 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3977 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3978 pic16_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3979 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3983 //debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
3984 if (IS_SYMOP (IC_LEFT (ic)))
3985 pic16_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3986 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3987 if (IS_SYMOP (IC_RIGHT (ic)))
3988 pic16_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3989 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3990 if (IS_SYMOP (IC_RESULT (ic)))
3991 pic16_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3992 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3995 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic16_ptrRegReq);
3999 /* if the condition of an if instruction
4000 is defined in the previous instruction then
4001 mark the itemp as a conditional */
4002 if ((IS_CONDITIONAL (ic) ||
4003 ((ic->op == BITWISEAND ||
4006 isBitwiseOptimizable (ic))) &&
4007 ic->next && ic->next->op == IFX &&
4008 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
4009 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
4012 debugLog (" %d\n", __LINE__);
4013 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
4017 debugLog(" %d\n", __LINE__);
4019 #ifndef NO_packRegsForSupport
4020 /* reduce for support function calls */
4021 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
4022 packRegsForSupport (ic, ebp);
4025 /* if a parameter is passed, it's in W, so we may not
4026 need to place a copy in a register */
4027 if (ic->op == RECEIVE)
4028 packForReceive (ic, ebp);
4030 #ifndef NO_packRegsForOneuse
4031 /* some cases the redundant moves can
4032 can be eliminated for return statements */
4033 if ((ic->op == RETURN || ic->op == SEND) &&
4034 !isOperandInFarSpace (IC_LEFT (ic)) &&
4036 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
4039 #ifndef NO_packRegsForOneuse
4040 /* if pointer set & left has a size more than
4041 one and right is not in far space */
4042 if (POINTER_SET (ic) &&
4043 !isOperandInFarSpace (IC_RIGHT (ic)) &&
4044 !OP_SYMBOL (IC_RESULT (ic))->remat &&
4045 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
4046 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
4048 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
4051 #ifndef NO_packRegsForOneuse
4052 /* if pointer get */
4053 if (POINTER_GET (ic) &&
4054 !isOperandInFarSpace (IC_RESULT (ic)) &&
4055 !OP_SYMBOL (IC_LEFT (ic))->remat &&
4056 !IS_OP_RUONLY (IC_RESULT (ic)) &&
4057 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
4059 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
4060 debugLog("%d - return from packRegsForOneuse\n", __LINE__);
4063 #ifndef NO_cast_peep
4064 /* if this is cast for intergral promotion then
4065 check if only use of the definition of the
4066 operand being casted/ if yes then replace
4067 the result of that arithmetic operation with
4068 this result and get rid of the cast */
4069 if (ic->op == CAST) {
4071 sym_link *fromType = operandType (IC_RIGHT (ic));
4072 sym_link *toType = operandType (IC_LEFT (ic));
4074 debugLog (" %d - casting\n", __LINE__);
4076 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
4077 getSize (fromType) != getSize (toType)) {
4080 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
4083 if (IS_ARITHMETIC_OP (dic)) {
4084 debugLog(" %d %s\n", __LINE__, __FUNCTION__ );
4086 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
4087 IC_RESULT (dic) = IC_RESULT (ic);
4088 remiCodeFromeBBlock (ebp, ic);
4089 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
4090 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
4091 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
4095 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
4099 /* if the type from and type to are the same
4100 then if this is the only use then packit */
4101 if (compareType (operandType (IC_RIGHT (ic)),
4102 operandType (IC_LEFT (ic))) == 1) {
4104 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
4107 debugLog(" %d\n", __LINE__);
4109 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
4110 IC_RESULT (dic) = IC_RESULT (ic);
4111 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
4112 remiCodeFromeBBlock (ebp, ic);
4113 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
4114 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
4123 /* there are some problems with packing variables
4124 * it seems that the live range estimator doesn't
4125 * estimate correctly the liveranges of some symbols */
4128 iTempNN := (some variable in farspace) V1
4133 if (ic->op == IPUSH)
4135 packForPush (ic, ebp);
4139 #ifndef NO_packRegsForAccUse
4140 /* pack registers for accumulator use, when the
4141 result of an arithmetic or bit wise operation
4142 has only one use, that use is immediately following
4143 the defintion and the using iCode has only one
4144 operand or has two operands but one is literal &
4145 the result of that operation is not on stack then
4146 we can leave the result of this operation in acc:b
4148 if ((IS_ARITHMETIC_OP (ic)
4150 || IS_BITWISE_OP (ic)
4152 || ic->op == LEFT_OP || ic->op == RIGHT_OP
4155 IS_ITEMP (IC_RESULT (ic)) &&
4156 getSize (operandType (IC_RESULT (ic))) <= 1)
4158 packRegsForAccUse (ic);
4165 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4169 if (!pic16_ralloc_debug || !debugF)
4172 for (i = 0; i < count; i++)
4174 fprintf (debugF, "\n----------------------------------------------------------------\n");
4175 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4176 ebbs[i]->entryLabel->name,
4179 ebbs[i]->isLastInLoop);
4180 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4185 fprintf (debugF, "visited %d : hasFcall = %d\n",
4189 fprintf (debugF, "\ndefines bitVector :");
4190 bitVectDebugOn (ebbs[i]->defSet, debugF);
4191 fprintf (debugF, "\nlocal defines bitVector :");
4192 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4193 fprintf (debugF, "\npointers Set bitvector :");
4194 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4195 fprintf (debugF, "\nin pointers Set bitvector :");
4196 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4197 fprintf (debugF, "\ninDefs Set bitvector :");
4198 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4199 fprintf (debugF, "\noutDefs Set bitvector :");
4200 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4201 fprintf (debugF, "\nusesDefs Set bitvector :");
4202 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4203 fprintf (debugF, "\n----------------------------------------------------------------\n");
4204 printiCChain (ebbs[i]->sch, debugF);
4207 /*-----------------------------------------------------------------*/
4208 /* pic16_assignRegisters - assigns registers to each live range as need */
4209 /*-----------------------------------------------------------------*/
4211 pic16_assignRegisters (eBBlock ** ebbs, int count)
4216 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4217 debugLog ("\nebbs before optimizing:\n");
4218 dumpEbbsToDebug (ebbs, count);
4220 _inRegAllocator = 1;
4222 setToNull ((void *) &_G.funcrUsed);
4223 pic16_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4226 /* change assignments this will remove some
4227 live ranges reducing some register pressure */
4228 for (i = 0; i < count; i++)
4229 pic16_packRegisters (ebbs[i]);
4236 debugLog("dir registers allocated so far:\n");
4237 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4240 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4241 // fprintf(stderr, " -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4242 reg = hTabNextItem(dynDirectRegNames, &hkey);
4247 /* liveranges probably changed by register packing
4248 so we compute them again */
4249 recomputeLiveRanges (ebbs, count);
4251 if (options.dump_pack)
4252 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4254 /* first determine for each live range the number of
4255 registers & the type of registers required for each */
4258 /* start counting function temporary registers from zero */
4261 /* and serially allocate registers */
4262 serialRegAssign (ebbs, count);
4265 debugLog ("ebbs after serialRegAssign:\n");
4266 dumpEbbsToDebug (ebbs, count);
4269 //pic16_freeAllRegs();
4271 /* if stack was extended then tell the user */
4274 /* werror(W_TOOMANY_SPILS,"stack", */
4275 /* _G.stackExtend,currFunc->name,""); */
4281 /* werror(W_TOOMANY_SPILS,"data space", */
4282 /* _G.dataExtend,currFunc->name,""); */
4286 /* after that create the register mask
4287 for each of the instruction */
4288 createRegMask (ebbs, count);
4290 /* redo that offsets for stacked automatic variables */
4291 redoStackOffsets ();
4293 if (options.dump_rassgn)
4294 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4296 /* now get back the chain */
4297 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4299 debugLog ("ebbs after optimizing:\n");
4300 dumpEbbsToDebug (ebbs, count);
4302 _inRegAllocator = 0;
4306 /* free up any _G.stackSpil locations allocated */
4307 applyToSet (_G.stackSpil, deallocStackSpil);
4309 setToNull ((void *) &_G.stackSpil);
4310 setToNull ((void *) &_G.spiltSet);
4311 /* mark all registers as free */
4312 pic16_freeAllRegs ();
4315 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");