1 /*------------------------------------------------------------------------
3 SDCCralloc.c - source file for register allocation. (8051) specific
5 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998)
6 Added Pic Port T.scott Dattalo scott@dattalo.com (2000)
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 In other words, you are welcome to use, share and improve this program.
23 You are forbidden to forbid anyone else to use, share and improve
24 what you give them. Help stamp out software-hoarding!
25 -------------------------------------------------------------------------*/
32 #if defined(__BORLANDC__) || defined(_MSC_VER)
33 #define STRCASECMP stricmp
35 #define STRCASECMP strcasecmp
38 /* this should go in SDCCicode.h, but it doesn't. */
39 #define IS_REF(op) (IS_SYMOP(op) && op->operand.symOperand->isref == 1)
41 /*-----------------------------------------------------------------*/
42 /* At this point we start getting processor specific although */
43 /* some routines are non-processor specific & can be reused when */
44 /* targetting other processors. The decision for this will have */
45 /* to be made on a routine by routine basis */
46 /* routines used to pack registers are most definitely not reusable */
47 /* since the pack the registers depending strictly on the MCU */
48 /*-----------------------------------------------------------------*/
50 extern void genpic14Code (iCode *);
51 extern void assignConfigWordValue(int address, int value);
61 bitVect *funcrUsed; /* registers used in a function */
67 /* Shared with gen.c */
68 int pic14_ptrRegReq; /* one byte pointer register required */
71 set *dynAllocRegs=NULL;
72 set *dynStackRegs=NULL;
73 set *dynProcessorRegs=NULL;
74 set *dynDirectRegs=NULL;
75 set *dynDirectBitRegs=NULL;
76 set *dynInternalRegs=NULL;
78 static hTab *dynDirectRegNames= NULL;
79 // static hTab *regHash = NULL; /* a hash table containing ALL registers */
81 static int dynrIdx=0x20;
82 static int rDirectIdx=0;
84 int pic14_nRegs = 128; // = sizeof (regspic14) / sizeof (regs);
86 int Gstack_base_addr=0; /* The starting address of registers that
87 * are used to pass and return parameters */
92 static void spillThis (symbol *);
94 static FILE *debugF = NULL;
95 /*-----------------------------------------------------------------*/
96 /* debugLog - open a file for debugging information */
97 /*-----------------------------------------------------------------*/
98 //static void debugLog(char *inst,char *fmt, ...)
100 debugLog (char *fmt,...)
102 static int append = 0; // First time through, open the file without append.
105 //char *bufferP=buffer;
108 if (!debug || !dstFileName)
114 /* create the file name */
115 strcpy (buffer, dstFileName);
116 strcat (buffer, ".d");
118 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
120 werror (E_FILE_OPEN_ERR, buffer);
123 append = 1; // Next time debubLog is called, we'll append the debug info
129 vsprintf (buffer, fmt, ap);
131 fprintf (debugF, "%s", buffer);
133 while (isspace(*bufferP)) bufferP++;
135 if (bufferP && *bufferP)
136 lineCurr = (lineCurr ?
137 connectLine(lineCurr,newLineNode(lb)) :
138 (lineHead = newLineNode(lb)));
139 lineCurr->isInline = _G.inLine;
140 lineCurr->isDebug = _G.debugLine;
150 fputc ('\n', debugF);
152 /*-----------------------------------------------------------------*/
153 /* debugLogClose - closes the debug log file (if opened) */
154 /*-----------------------------------------------------------------*/
164 #define AOP(op) op->aop
167 debugAopGet (char *str, operand * op)
172 printOperand (op, debugF);
180 decodeOp (unsigned int op)
183 if (op < 128 && op > ' ')
185 buffer[0] = (op & 0xff);
199 return "STRING_LITERAL";
235 return "LEFT_ASSIGN";
237 return "RIGHT_ASSIGN";
352 case GET_VALUE_AT_ADDRESS:
353 return "GET_VALUE_AT_ADDRESS";
371 return "ENDFUNCTION";
395 sprintf (buffer, "unkown op %d %c", op, op & 0xff);
398 /*-----------------------------------------------------------------*/
399 /*-----------------------------------------------------------------*/
401 debugLogRegType (short type)
414 sprintf (buffer, "unknown reg type %d", type);
418 /*-----------------------------------------------------------------*/
419 /*-----------------------------------------------------------------*/
420 static int regname2key(char const *name)
429 key += (*name++) + 1;
433 return ( (key + (key >> 4) + (key>>8)) & 0x3f);
437 /*-----------------------------------------------------------------*/
438 /* newReg - allocate and init memory for a new register */
439 /*-----------------------------------------------------------------*/
440 static regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias)
445 dReg = Safe_calloc(1,sizeof(regs));
447 dReg->pc_type = pc_type;
450 dReg->name = Safe_strdup(name);
452 sprintf(buffer,"r0x%02X", dReg->rIdx);
455 dReg->name = Safe_strdup(buffer);
457 //fprintf(stderr,"newReg: %s, rIdx = 0x%02x\n",dReg->name,rIdx);
470 dReg->reg_alias = NULL;
471 dReg->reglives.usedpFlows = newSet();
472 dReg->reglives.assignedpFlows = newSet();
474 hTabAddItem(&dynDirectRegNames, regname2key(name), dReg);
479 /*-----------------------------------------------------------------*/
480 /* regWithIdx - Search through a set of registers that matches idx */
481 /*-----------------------------------------------------------------*/
483 regWithIdx (set *dRegs, int idx, int fixed)
487 for (dReg = setFirstItem(dRegs) ; dReg ;
488 dReg = setNextItem(dRegs)) {
490 if(idx == dReg->rIdx && (fixed == (int)dReg->isFixed)) {
498 /*-----------------------------------------------------------------*/
499 /* regFindFree - Search for a free register in a set of registers */
500 /*-----------------------------------------------------------------*/
502 regFindFree (set *dRegs)
506 for (dReg = setFirstItem(dRegs) ; dReg ;
507 dReg = setNextItem(dRegs)) {
515 /*-----------------------------------------------------------------*/
516 /* initStack - allocate registers for a psuedo stack */
517 /*-----------------------------------------------------------------*/
518 void initStack(int base_address, int size)
523 Gstack_base_addr = base_address;
524 //fprintf(stderr,"initStack");
526 for(i = 0; i<size; i++)
527 addSet(&dynStackRegs,newReg(REG_STK, PO_GPR_TEMP,base_address++,NULL,1,0));
530 /*-----------------------------------------------------------------*
531 *-----------------------------------------------------------------*/
533 allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
536 //fprintf(stderr,"allocProcessorRegister %s addr =0x%x\n",name,rIdx);
537 return addSet(&dynProcessorRegs,newReg(REG_SFR, po_type, rIdx, name,1,alias));
540 /*-----------------------------------------------------------------*
541 *-----------------------------------------------------------------*/
544 allocInternalRegister(int rIdx, char * name, short po_type, int alias)
546 regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias);
548 //fprintf(stderr,"allocInternalRegister %s addr =0x%x\n",name,rIdx);
551 return addSet(&dynInternalRegs,reg);
556 /*-----------------------------------------------------------------*/
557 /* allocReg - allocates register of given type */
558 /*-----------------------------------------------------------------*/
560 allocReg (short type)
563 debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
564 //fprintf(stderr,"allocReg\n");
567 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
572 /*-----------------------------------------------------------------*/
573 /* dirregWithName - search for register by name */
574 /*-----------------------------------------------------------------*/
576 dirregWithName (char *name)
584 /* hash the name to get a key */
586 hkey = regname2key(name);
588 reg = hTabFirstItemWK(dynDirectRegNames, hkey);
592 if(STRCASECMP(reg->name, name) == 0) {
596 reg = hTabNextItemWK (dynDirectRegNames);
600 return NULL; // name wasn't found in the hash table
603 int IS_CONFIG_ADDRESS(int address)
606 return address == 0x2007;
609 /*-----------------------------------------------------------------*/
610 /* allocDirReg - allocates register of given type */
611 /*-----------------------------------------------------------------*/
613 allocDirReg (operand *op )
620 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
624 name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
626 /* If the symbol is at a fixed address, then remove the leading underscore
627 * from the name. This is hack to allow the .asm include file named registers
628 * to match the .c declared register names */
630 //if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && (*name == '_'))
633 debugLog ("%s symbol name %s\n", __FUNCTION__,name);
635 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
636 debugLog(" %d const char\n",__LINE__);
637 debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
640 debugLog(" %d storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
641 if (IS_CODE ( OP_SYM_ETYPE(op)) )
642 debugLog(" %d code space\n",__LINE__);
644 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
645 debugLog(" %d integral\n",__LINE__);
646 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
647 debugLog(" %d literal\n",__LINE__);
648 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
649 debugLog(" %d specifier\n",__LINE__);
650 debugAopGet(NULL, op);
653 if (IS_CODE ( OP_SYM_ETYPE(op)) )
656 /* First, search the hash table to see if there is a register with this name */
657 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && !(IS_BITVAR (OP_SYM_ETYPE(op))) ) {
658 reg = regWithIdx (dynProcessorRegs, SPEC_ADDR ( OP_SYM_ETYPE(op)), 1);
661 fprintf(stderr,"ralloc %s is at fixed address but not a processor reg, addr=0x%x\n",
662 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
664 fprintf(stderr,"ralloc %s at fixed address has already been declared, addr=0x%x\n",
665 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
668 //fprintf(stderr,"ralloc:%d %s \n", __LINE__,name);
670 reg = dirregWithName(name);
676 /* if this is at an absolute address, then get the address. */
677 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
678 address = SPEC_ADDR ( OP_SYM_ETYPE(op));
679 //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
682 /* Register wasn't found in hash, so let's create
683 * a new one and put it in the hash table AND in the
684 * dynDirectRegNames set */
685 if(!IS_CONFIG_ADDRESS(address)) {
686 //fprintf(stderr,"allocating new reg %s\n",name);
688 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0 );
689 debugLog (" -- added %s to hash, size = %d\n", name,reg->size);
691 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
693 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
695 //fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
699 if (IS_BITVAR (OP_SYM_ETYPE(op))) {
700 addSet(&dynDirectBitRegs, reg);
703 addSet(&dynDirectRegs, reg);
706 debugLog (" -- %s is declared at address 0x2007\n",name);
711 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
713 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
714 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
720 /*-----------------------------------------------------------------*/
721 /* allocDirReg - allocates register of given type */
722 /*-----------------------------------------------------------------*/
724 allocRegByName (char *name, int size)
730 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
734 /* First, search the hash table to see if there is a register with this name */
735 reg = dirregWithName(name);
739 /* Register wasn't found in hash, so let's create
740 * a new one and put it in the hash table AND in the
741 * dynDirectRegNames set */
742 //fprintf (stderr,"%s symbol name %s\n", __FUNCTION__,name);
743 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0 );
745 debugLog (" -- added %s to hash, size = %d\n", name,reg->size);
747 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
748 addSet(&dynDirectRegs, reg);
754 /*-----------------------------------------------------------------*/
755 /* RegWithIdx - returns pointer to register with index number */
756 /*-----------------------------------------------------------------*/
758 typeRegWithIdx (int idx, int type, int fixed)
763 debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
768 if( (dReg = regWithIdx ( dynAllocRegs, idx, fixed)) != NULL) {
770 debugLog ("Found a Dynamic Register!\n");
773 if( (dReg = regWithIdx ( dynDirectRegs, idx, fixed)) != NULL ) {
774 debugLog ("Found a Direct Register!\n");
780 if( (dReg = regWithIdx ( dynStackRegs, idx, fixed)) != NULL ) {
781 debugLog ("Found a Stack Register!\n");
786 if( (dReg = regWithIdx ( dynProcessorRegs, idx, fixed)) != NULL ) {
787 debugLog ("Found a Processor Register!\n");
801 /*-----------------------------------------------------------------*/
802 /* pic14_regWithIdx - returns pointer to register with index number*/
803 /*-----------------------------------------------------------------*/
805 pic14_regWithIdx (int idx)
809 if( (dReg = typeRegWithIdx(idx,REG_GPR,0)) != NULL)
812 if( (dReg = typeRegWithIdx(idx,REG_SFR,0)) != NULL)
815 if( (dReg = typeRegWithIdx(idx,REG_STK,0)) != NULL)
821 /*-----------------------------------------------------------------*/
822 /* pic14_regWithIdx - returns pointer to register with index number */
823 /*-----------------------------------------------------------------*/
825 pic14_allocWithIdx (int idx)
830 debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
832 if( (dReg = regWithIdx ( dynAllocRegs, idx,0)) != NULL) {
834 debugLog ("Found a Dynamic Register!\n");
835 } else if( (dReg = regWithIdx ( dynStackRegs, idx,0)) != NULL ) {
836 debugLog ("Found a Stack Register!\n");
837 } else if( (dReg = regWithIdx ( dynProcessorRegs, idx,0)) != NULL ) {
838 debugLog ("Found a Processor Register!\n");
839 } else if( (dReg = regWithIdx ( dynInternalRegs, idx,0)) != NULL ) {
840 debugLog ("Found an Internal Register!\n");
841 } else if( (dReg = regWithIdx ( dynInternalRegs, idx,1)) != NULL ) {
842 debugLog ("Found an Internal Register!\n");
845 debugLog ("Dynamic Register not found\n");
848 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
849 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
850 "regWithIdx not found");
860 /*-----------------------------------------------------------------*/
861 /*-----------------------------------------------------------------*/
863 pic14_findFreeReg(short type)
870 if((dReg = regFindFree(dynAllocRegs)) != NULL)
872 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
876 if((dReg = regFindFree(dynStackRegs)) != NULL)
888 /*-----------------------------------------------------------------*/
889 /* freeReg - frees a register */
890 /*-----------------------------------------------------------------*/
894 debugLog ("%s\n", __FUNCTION__);
899 /*-----------------------------------------------------------------*/
900 /* nFreeRegs - returns number of free registers */
901 /*-----------------------------------------------------------------*/
905 /* dynamically allocate as many as we need and worry about
906 * fitting them into a PIC later */
913 debugLog ("%s\n", __FUNCTION__);
914 for (i = 0; i < pic14_nRegs; i++)
915 if (regspic14[i].isFree && regspic14[i].type == type)
921 /*-----------------------------------------------------------------*/
922 /* nfreeRegsType - free registers with type */
923 /*-----------------------------------------------------------------*/
925 nfreeRegsType (int type)
928 debugLog ("%s\n", __FUNCTION__);
931 if ((nfr = nFreeRegs (type)) == 0)
932 return nFreeRegs (REG_GPR);
935 return nFreeRegs (type);
938 void writeSetUsedRegs(FILE *of, set *dRegs)
943 for (dReg = setFirstItem(dRegs) ; dReg ;
944 dReg = setNextItem(dRegs)) {
947 fprintf (of, "\t%s\n",dReg->name);
951 extern void assignFixedRegisters(set *regset);
952 extern void assignRelocatableRegisters(set *regset,int used);
953 extern void dump_map(void);
954 extern void dump_sfr(FILE *of);
956 void packBits(set *bregs)
961 regs *relocbitfield=NULL;
967 for (regset = bregs ; regset ;
968 regset = regset->next) {
971 breg->isBitField = 1;
972 //fprintf(stderr,"bit reg: %s\n",breg->name);
975 //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
977 bitfield = typeRegWithIdx (breg->address >> 3, -1 , 1);
978 breg->rIdx = breg->address & 7;
982 //sprintf (buffer, "fbitfield%02x", breg->address);
983 sprintf (buffer, "0x%02x", breg->address);
984 //fprintf(stderr,"new bit field\n");
985 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0);
986 bitfield->isBitField = 1;
987 bitfield->isFixed = 1;
988 bitfield->address = breg->address;
989 //addSet(&dynDirectRegs,bitfield);
990 addSet(&dynInternalRegs,bitfield);
991 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
993 //fprintf(stderr," which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
996 breg->reg_alias = bitfield;
1000 if(!relocbitfield || bit_no >7) {
1003 sprintf (buffer, "bitfield%d", byte_no);
1004 //fprintf(stderr,"new relocatable bit field\n");
1005 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0);
1006 relocbitfield->isBitField = 1;
1007 //addSet(&dynDirectRegs,relocbitfield);
1008 addSet(&dynInternalRegs,relocbitfield);
1009 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1013 breg->reg_alias = relocbitfield;
1014 breg->address = rDirectIdx; /* byte_no; */
1015 breg->rIdx = bit_no++;
1023 void bitEQUs(FILE *of, set *bregs)
1025 regs *breg,*bytereg;
1028 //fprintf(stderr," %s\n",__FUNCTION__);
1029 for (breg = setFirstItem(bregs) ; breg ;
1030 breg = setNextItem(bregs)) {
1032 //fprintf(stderr,"bit reg: %s\n",breg->name);
1034 bytereg = breg->reg_alias;
1036 fprintf (of, "%s\tEQU\t( (%s<<3)+%d)\n",
1039 breg->rIdx & 0x0007);
1042 //fprintf(stderr, "bit field is not assigned to a register\n");
1043 fprintf (of, "%s\tEQU\t( (bitfield%d<<3)+%d)\n",
1053 void aliasEQUs(FILE *of, set *fregs, int use_rIdx)
1058 for (reg = setFirstItem(fregs) ; reg ;
1059 reg = setNextItem(fregs)) {
1061 //if(!reg->isEmitted && reg->wasUsed) {
1064 fprintf (of, "%s\tEQU\t0x%03x\n",
1068 fprintf (of, "%s\tEQU\t0x%03x\n",
1076 void writeUsedRegs(FILE *of)
1078 packBits(dynDirectBitRegs);
1080 assignFixedRegisters(dynInternalRegs);
1081 assignFixedRegisters(dynAllocRegs);
1082 assignFixedRegisters(dynStackRegs);
1083 assignFixedRegisters(dynDirectRegs);
1085 assignRelocatableRegisters(dynInternalRegs,0);
1086 assignRelocatableRegisters(dynAllocRegs,0);
1087 assignRelocatableRegisters(dynStackRegs,0);
1090 assignRelocatableRegisters(dynDirectRegs,0);
1091 printf("assignRelocatableRegisters(dynDirectRegs,0);\n");
1096 bitEQUs(of,dynDirectBitRegs);
1098 aliasEQUs(of,dynAllocRegs,0);
1099 aliasEQUs(of,dynDirectRegs,0);
1100 aliasEQUs(of,dynStackRegs,0);
1101 aliasEQUs(of,dynProcessorRegs,1);
1106 /*-----------------------------------------------------------------*/
1107 /* allDefsOutOfRange - all definitions are out of a range */
1108 /*-----------------------------------------------------------------*/
1110 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
1114 debugLog ("%s\n", __FUNCTION__);
1118 for (i = 0; i < defs->size; i++)
1122 if (bitVectBitValue (defs, i) &&
1123 (ic = hTabItemWithKey (iCodehTab, i)) &&
1124 (ic->seq >= fseq && ic->seq <= toseq))
1134 /*-----------------------------------------------------------------*/
1135 /* computeSpillable - given a point find the spillable live ranges */
1136 /*-----------------------------------------------------------------*/
1138 computeSpillable (iCode * ic)
1142 debugLog ("%s\n", __FUNCTION__);
1143 /* spillable live ranges are those that are live at this
1144 point . the following categories need to be subtracted
1146 a) - those that are already spilt
1147 b) - if being used by this one
1148 c) - defined by this one */
1150 spillable = bitVectCopy (ic->rlive);
1152 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1154 bitVectCplAnd (spillable, ic->uses); /* used in this one */
1155 bitVectUnSetBit (spillable, ic->defKey);
1156 spillable = bitVectIntersect (spillable, _G.regAssigned);
1161 /*-----------------------------------------------------------------*/
1162 /* noSpilLoc - return true if a variable has no spil location */
1163 /*-----------------------------------------------------------------*/
1165 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1167 debugLog ("%s\n", __FUNCTION__);
1168 return (sym->usl.spillLoc ? 0 : 1);
1171 /*-----------------------------------------------------------------*/
1172 /* hasSpilLoc - will return 1 if the symbol has spil location */
1173 /*-----------------------------------------------------------------*/
1175 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1177 debugLog ("%s\n", __FUNCTION__);
1178 return (sym->usl.spillLoc ? 1 : 0);
1181 /*-----------------------------------------------------------------*/
1182 /* directSpilLoc - will return 1 if the splilocation is in direct */
1183 /*-----------------------------------------------------------------*/
1185 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1187 debugLog ("%s\n", __FUNCTION__);
1188 if (sym->usl.spillLoc &&
1189 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1195 /*-----------------------------------------------------------------*/
1196 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1197 /* but is not used as a pointer */
1198 /*-----------------------------------------------------------------*/
1200 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1202 debugLog ("%s\n", __FUNCTION__);
1203 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1206 /*-----------------------------------------------------------------*/
1207 /* rematable - will return 1 if the remat flag is set */
1208 /*-----------------------------------------------------------------*/
1210 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1212 debugLog ("%s\n", __FUNCTION__);
1216 /*-----------------------------------------------------------------*/
1217 /* notUsedInRemaining - not used or defined in remain of the block */
1218 /*-----------------------------------------------------------------*/
1220 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1222 debugLog ("%s\n", __FUNCTION__);
1223 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1224 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1227 /*-----------------------------------------------------------------*/
1228 /* allLRs - return true for all */
1229 /*-----------------------------------------------------------------*/
1231 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1233 debugLog ("%s\n", __FUNCTION__);
1237 /*-----------------------------------------------------------------*/
1238 /* liveRangesWith - applies function to a given set of live range */
1239 /*-----------------------------------------------------------------*/
1241 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1242 eBBlock * ebp, iCode * ic)
1247 debugLog ("%s\n", __FUNCTION__);
1248 if (!lrs || !lrs->size)
1251 for (i = 1; i < lrs->size; i++)
1254 if (!bitVectBitValue (lrs, i))
1257 /* if we don't find it in the live range
1258 hash table we are in serious trouble */
1259 if (!(sym = hTabItemWithKey (liveRanges, i)))
1261 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1262 "liveRangesWith could not find liveRange");
1266 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1267 addSetHead (&rset, sym);
1274 /*-----------------------------------------------------------------*/
1275 /* leastUsedLR - given a set determines which is the least used */
1276 /*-----------------------------------------------------------------*/
1278 leastUsedLR (set * sset)
1280 symbol *sym = NULL, *lsym = NULL;
1282 debugLog ("%s\n", __FUNCTION__);
1283 sym = lsym = setFirstItem (sset);
1288 for (; lsym; lsym = setNextItem (sset))
1291 /* if usage is the same then prefer
1292 the spill the smaller of the two */
1293 if (lsym->used == sym->used)
1294 if (getSize (lsym->type) < getSize (sym->type))
1298 if (lsym->used < sym->used)
1303 setToNull ((void **) &sset);
1308 /*-----------------------------------------------------------------*/
1309 /* noOverLap - will iterate through the list looking for over lap */
1310 /*-----------------------------------------------------------------*/
1312 noOverLap (set * itmpStack, symbol * fsym)
1315 debugLog ("%s\n", __FUNCTION__);
1318 for (sym = setFirstItem (itmpStack); sym;
1319 sym = setNextItem (itmpStack))
1321 if (sym->liveTo > fsym->liveFrom)
1329 /*-----------------------------------------------------------------*/
1330 /* isFree - will return 1 if the a free spil location is found */
1331 /*-----------------------------------------------------------------*/
1336 V_ARG (symbol **, sloc);
1337 V_ARG (symbol *, fsym);
1339 debugLog ("%s\n", __FUNCTION__);
1340 /* if already found */
1344 /* if it is free && and the itmp assigned to
1345 this does not have any overlapping live ranges
1346 with the one currently being assigned and
1347 the size can be accomodated */
1349 noOverLap (sym->usl.itmpStack, fsym) &&
1350 getSize (sym->type) >= getSize (fsym->type))
1359 /*-----------------------------------------------------------------*/
1360 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
1361 /*-----------------------------------------------------------------*/
1363 spillLRWithPtrReg (symbol * forSym)
1369 debugLog ("%s\n", __FUNCTION__);
1370 if (!_G.regAssigned ||
1371 bitVectIsZero (_G.regAssigned))
1374 r0 = pic14_regWithIdx (R0_IDX);
1375 r1 = pic14_regWithIdx (R1_IDX);
1377 /* for all live ranges */
1378 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1379 lrsym = hTabNextItem (liveRanges, &k))
1383 /* if no registers assigned to it or
1385 /* if it does not overlap with this then
1386 not need to spill it */
1388 if (lrsym->isspilt || !lrsym->nRegs ||
1389 (lrsym->liveTo < forSym->liveFrom))
1392 /* go thru the registers : if it is either
1393 r0 or r1 then spil it */
1394 for (j = 0; j < lrsym->nRegs; j++)
1395 if (lrsym->regs[j] == r0 ||
1396 lrsym->regs[j] == r1)
1405 /*-----------------------------------------------------------------*/
1406 /* createStackSpil - create a location on the stack to spil */
1407 /*-----------------------------------------------------------------*/
1409 createStackSpil (symbol * sym)
1411 symbol *sloc = NULL;
1412 int useXstack, model, noOverlay;
1414 char slocBuffer[30];
1415 debugLog ("%s\n", __FUNCTION__);
1417 /* first go try and find a free one that is already
1418 existing on the stack */
1419 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1421 /* found a free one : just update & return */
1422 sym->usl.spillLoc = sloc;
1425 addSetHead (&sloc->usl.itmpStack, sym);
1429 /* could not then have to create one , this is the hard part
1430 we need to allocate this on the stack : this is really a
1431 hack!! but cannot think of anything better at this time */
1433 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1435 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1436 __FILE__, __LINE__);
1440 sloc = newiTemp (slocBuffer);
1442 /* set the type to the spilling symbol */
1443 sloc->type = copyLinkChain (sym->type);
1444 sloc->etype = getSpec (sloc->type);
1445 SPEC_SCLS (sloc->etype) = S_DATA;
1446 SPEC_EXTR (sloc->etype) = 0;
1447 SPEC_STAT (sloc->etype) = 0;
1449 /* we don't allow it to be allocated`
1450 onto the external stack since : so we
1451 temporarily turn it off ; we also
1452 turn off memory model to prevent
1453 the spil from going to the external storage
1454 and turn off overlaying
1457 useXstack = options.useXstack;
1458 model = options.model;
1459 noOverlay = options.noOverlay;
1460 options.noOverlay = 1;
1461 options.model = options.useXstack = 0;
1465 options.useXstack = useXstack;
1466 options.model = model;
1467 options.noOverlay = noOverlay;
1468 sloc->isref = 1; /* to prevent compiler warning */
1470 /* if it is on the stack then update the stack */
1471 if (IN_STACK (sloc->etype))
1473 currFunc->stack += getSize (sloc->type);
1474 _G.stackExtend += getSize (sloc->type);
1477 _G.dataExtend += getSize (sloc->type);
1479 /* add it to the _G.stackSpil set */
1480 addSetHead (&_G.stackSpil, sloc);
1481 sym->usl.spillLoc = sloc;
1484 /* add it to the set of itempStack set
1485 of the spill location */
1486 addSetHead (&sloc->usl.itmpStack, sym);
1490 /*-----------------------------------------------------------------*/
1491 /* isSpiltOnStack - returns true if the spil location is on stack */
1492 /*-----------------------------------------------------------------*/
1494 isSpiltOnStack (symbol * sym)
1498 debugLog ("%s\n", __FUNCTION__);
1505 /* if (sym->_G.stackSpil) */
1508 if (!sym->usl.spillLoc)
1511 etype = getSpec (sym->usl.spillLoc->type);
1512 if (IN_STACK (etype))
1518 /*-----------------------------------------------------------------*/
1519 /* spillThis - spils a specific operand */
1520 /*-----------------------------------------------------------------*/
1522 spillThis (symbol * sym)
1525 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1527 /* if this is rematerializable or has a spillLocation
1528 we are okay, else we need to create a spillLocation
1530 if (!(sym->remat || sym->usl.spillLoc))
1531 createStackSpil (sym);
1534 /* mark it has spilt & put it in the spilt set */
1536 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1538 bitVectUnSetBit (_G.regAssigned, sym->key);
1540 for (i = 0; i < sym->nRegs; i++)
1544 freeReg (sym->regs[i]);
1545 sym->regs[i] = NULL;
1548 /* if spilt on stack then free up r0 & r1
1549 if they could have been assigned to some
1551 if (!pic14_ptrRegReq && isSpiltOnStack (sym))
1554 spillLRWithPtrReg (sym);
1557 if (sym->usl.spillLoc && !sym->remat)
1558 sym->usl.spillLoc->allocreq = 1;
1562 /*-----------------------------------------------------------------*/
1563 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1564 /*-----------------------------------------------------------------*/
1566 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1568 bitVect *lrcs = NULL;
1572 debugLog ("%s\n", __FUNCTION__);
1573 /* get the spillable live ranges */
1574 lrcs = computeSpillable (ic);
1576 /* get all live ranges that are rematerizable */
1577 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1580 /* return the least used of these */
1581 return leastUsedLR (selectS);
1584 /* get live ranges with spillLocations in direct space */
1585 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1587 sym = leastUsedLR (selectS);
1588 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1589 sym->usl.spillLoc->rname :
1590 sym->usl.spillLoc->name));
1592 /* mark it as allocation required */
1593 sym->usl.spillLoc->allocreq = 1;
1597 /* if the symbol is local to the block then */
1598 if (forSym->liveTo < ebp->lSeq)
1601 /* check if there are any live ranges allocated
1602 to registers that are not used in this block */
1603 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1605 sym = leastUsedLR (selectS);
1606 /* if this is not rematerializable */
1615 /* check if there are any live ranges that not
1616 used in the remainder of the block */
1617 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1619 sym = leastUsedLR (selectS);
1622 sym->remainSpil = 1;
1629 /* find live ranges with spillocation && not used as pointers */
1630 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1633 sym = leastUsedLR (selectS);
1634 /* mark this as allocation required */
1635 sym->usl.spillLoc->allocreq = 1;
1639 /* find live ranges with spillocation */
1640 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1643 sym = leastUsedLR (selectS);
1644 sym->usl.spillLoc->allocreq = 1;
1648 /* couldn't find then we need to create a spil
1649 location on the stack , for which one? the least
1651 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1654 /* return a created spil location */
1655 sym = createStackSpil (leastUsedLR (selectS));
1656 sym->usl.spillLoc->allocreq = 1;
1660 /* this is an extreme situation we will spill
1661 this one : happens very rarely but it does happen */
1667 /*-----------------------------------------------------------------*/
1668 /* spilSomething - spil some variable & mark registers as free */
1669 /*-----------------------------------------------------------------*/
1671 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1676 debugLog ("%s\n", __FUNCTION__);
1677 /* get something we can spil */
1678 ssym = selectSpil (ic, ebp, forSym);
1680 /* mark it as spilt */
1682 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1684 /* mark it as not register assigned &
1685 take it away from the set */
1686 bitVectUnSetBit (_G.regAssigned, ssym->key);
1688 /* mark the registers as free */
1689 for (i = 0; i < ssym->nRegs; i++)
1691 freeReg (ssym->regs[i]);
1693 /* if spilt on stack then free up r0 & r1
1694 if they could have been assigned to as gprs */
1695 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1698 spillLRWithPtrReg (ssym);
1701 /* if this was a block level spil then insert push & pop
1702 at the start & end of block respectively */
1703 if (ssym->blockSpil)
1705 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1706 /* add push to the start of the block */
1707 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1708 ebp->sch->next : ebp->sch));
1709 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1710 /* add pop to the end of the block */
1711 addiCodeToeBBlock (ebp, nic, NULL);
1714 /* if spilt because not used in the remainder of the
1715 block then add a push before this instruction and
1716 a pop at the end of the block */
1717 if (ssym->remainSpil)
1720 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1721 /* add push just before this instruction */
1722 addiCodeToeBBlock (ebp, nic, ic);
1724 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1725 /* add pop to the end of the block */
1726 addiCodeToeBBlock (ebp, nic, NULL);
1735 /*-----------------------------------------------------------------*/
1736 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1737 /*-----------------------------------------------------------------*/
1739 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1743 debugLog ("%s\n", __FUNCTION__);
1745 /* try for a ptr type */
1746 if ((reg = allocReg (REG_PTR)))
1749 /* try for gpr type */
1750 if ((reg = allocReg (REG_GPR)))
1753 /* we have to spil */
1754 if (!spilSomething (ic, ebp, sym))
1757 /* this looks like an infinite loop but
1758 in really selectSpil will abort */
1762 /*-----------------------------------------------------------------*/
1763 /* getRegGpr - will try for GPR if not spil */
1764 /*-----------------------------------------------------------------*/
1766 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1770 debugLog ("%s\n", __FUNCTION__);
1772 /* try for gpr type */
1773 if ((reg = allocReg (REG_GPR)))
1776 if (!pic14_ptrRegReq)
1777 if ((reg = allocReg (REG_PTR)))
1780 /* we have to spil */
1781 if (!spilSomething (ic, ebp, sym))
1784 /* this looks like an infinite loop but
1785 in really selectSpil will abort */
1789 /*-----------------------------------------------------------------*/
1790 /* symHasReg - symbol has a given register */
1791 /*-----------------------------------------------------------------*/
1793 symHasReg (symbol * sym, regs * reg)
1797 debugLog ("%s\n", __FUNCTION__);
1798 for (i = 0; i < sym->nRegs; i++)
1799 if (sym->regs[i] == reg)
1805 /*-----------------------------------------------------------------*/
1806 /* deassignLRs - check the live to and if they have registers & are */
1807 /* not spilt then free up the registers */
1808 /*-----------------------------------------------------------------*/
1810 deassignLRs (iCode * ic, eBBlock * ebp)
1816 debugLog ("%s\n", __FUNCTION__);
1817 for (sym = hTabFirstItem (liveRanges, &k); sym;
1818 sym = hTabNextItem (liveRanges, &k))
1821 symbol *psym = NULL;
1822 /* if it does not end here */
1823 if (sym->liveTo > ic->seq)
1826 /* if it was spilt on stack then we can
1827 mark the stack spil location as free */
1832 sym->usl.spillLoc->isFree = 1;
1838 if (!bitVectBitValue (_G.regAssigned, sym->key))
1841 /* special case check if this is an IFX &
1842 the privious one was a pop and the
1843 previous one was not spilt then keep track
1845 if (ic->op == IFX && ic->prev &&
1846 ic->prev->op == IPOP &&
1847 !ic->prev->parmPush &&
1848 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
1849 psym = OP_SYMBOL (IC_LEFT (ic->prev));
1855 bitVectUnSetBit (_G.regAssigned, sym->key);
1857 /* if the result of this one needs registers
1858 and does not have it then assign it right
1860 if (IC_RESULT (ic) &&
1861 !(SKIP_IC2 (ic) || /* not a special icode */
1862 ic->op == JUMPTABLE ||
1867 POINTER_SET (ic)) &&
1868 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
1869 result->liveTo > ic->seq && /* and will live beyond this */
1870 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
1871 result->regType == sym->regType && /* same register types */
1872 result->nRegs && /* which needs registers */
1873 !result->isspilt && /* and does not already have them */
1875 !bitVectBitValue (_G.regAssigned, result->key) &&
1876 /* the number of free regs + number of regs in this LR
1877 can accomodate the what result Needs */
1878 ((nfreeRegsType (result->regType) +
1879 sym->nRegs) >= result->nRegs)
1883 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
1885 result->regs[i] = sym->regs[i];
1887 result->regs[i] = getRegGpr (ic, ebp, result);
1889 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
1893 /* free the remaining */
1894 for (; i < sym->nRegs; i++)
1898 if (!symHasReg (psym, sym->regs[i]))
1899 freeReg (sym->regs[i]);
1902 freeReg (sym->regs[i]);
1909 /*-----------------------------------------------------------------*/
1910 /* reassignLR - reassign this to registers */
1911 /*-----------------------------------------------------------------*/
1913 reassignLR (operand * op)
1915 symbol *sym = OP_SYMBOL (op);
1918 debugLog ("%s\n", __FUNCTION__);
1919 /* not spilt any more */
1920 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
1921 bitVectUnSetBit (_G.spiltSet, sym->key);
1923 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1927 for (i = 0; i < sym->nRegs; i++)
1928 sym->regs[i]->isFree = 0;
1931 /*-----------------------------------------------------------------*/
1932 /* willCauseSpill - determines if allocating will cause a spill */
1933 /*-----------------------------------------------------------------*/
1935 willCauseSpill (int nr, int rt)
1937 debugLog ("%s\n", __FUNCTION__);
1938 /* first check if there are any avlb registers
1939 of te type required */
1942 /* special case for pointer type
1943 if pointer type not avlb then
1944 check for type gpr */
1945 if (nFreeRegs (rt) >= nr)
1947 if (nFreeRegs (REG_GPR) >= nr)
1952 if (pic14_ptrRegReq)
1954 if (nFreeRegs (rt) >= nr)
1959 if (nFreeRegs (REG_PTR) +
1960 nFreeRegs (REG_GPR) >= nr)
1965 debugLog (" ... yep it will (cause a spill)\n");
1966 /* it will cause a spil */
1970 /*-----------------------------------------------------------------*/
1971 /* positionRegs - the allocator can allocate same registers to res- */
1972 /* ult and operand, if this happens make sure they are in the same */
1973 /* position as the operand otherwise chaos results */
1974 /*-----------------------------------------------------------------*/
1976 positionRegs (symbol * result, symbol * opsym, int lineno)
1978 int count = min (result->nRegs, opsym->nRegs);
1979 int i, j = 0, shared = 0;
1981 debugLog ("%s\n", __FUNCTION__);
1982 /* if the result has been spilt then cannot share */
1987 /* first make sure that they actually share */
1988 for (i = 0; i < count; i++)
1990 for (j = 0; j < count; j++)
1992 if (result->regs[i] == opsym->regs[j] && i != j)
2002 regs *tmp = result->regs[i];
2003 result->regs[i] = result->regs[j];
2004 result->regs[j] = tmp;
2009 /*-----------------------------------------------------------------*/
2010 /* serialRegAssign - serially allocate registers to the variables */
2011 /*-----------------------------------------------------------------*/
2013 serialRegAssign (eBBlock ** ebbs, int count)
2017 debugLog ("%s\n", __FUNCTION__);
2018 /* for all blocks */
2019 for (i = 0; i < count; i++)
2024 if (ebbs[i]->noPath &&
2025 (ebbs[i]->entryLabel != entryLabel &&
2026 ebbs[i]->entryLabel != returnLabel))
2029 /* of all instructions do */
2030 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2033 debugLog (" op: %s\n", decodeOp (ic->op));
2035 /* if this is an ipop that means some live
2036 range will have to be assigned again */
2038 reassignLR (IC_LEFT (ic));
2040 /* if result is present && is a true symbol */
2041 if (IC_RESULT (ic) && ic->op != IFX &&
2042 IS_TRUE_SYMOP (IC_RESULT (ic)))
2043 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2045 /* take away registers from live
2046 ranges that end at this instruction */
2047 deassignLRs (ic, ebbs[i]);
2049 /* some don't need registers */
2050 if (SKIP_IC2 (ic) ||
2051 ic->op == JUMPTABLE ||
2055 (IC_RESULT (ic) && POINTER_SET (ic)))
2058 /* now we need to allocate registers
2059 only for the result */
2062 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2068 /* if it does not need or is spilt
2069 or is already assigned to registers
2070 or will not live beyond this instructions */
2073 bitVectBitValue (_G.regAssigned, sym->key) ||
2074 sym->liveTo <= ic->seq)
2077 /* if some liverange has been spilt at the block level
2078 and this one live beyond this block then spil this
2080 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2085 /* if trying to allocate this will cause
2086 a spill and there is nothing to spill
2087 or this one is rematerializable then
2089 willCS = willCauseSpill (sym->nRegs, sym->regType);
2090 spillable = computeSpillable (ic);
2092 (willCS && bitVectIsZero (spillable)))
2100 /* if it has a spillocation & is used less than
2101 all other live ranges then spill this */
2103 if (sym->usl.spillLoc) {
2104 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2105 allLRs, ebbs[i], ic));
2106 if (leastUsed && leastUsed->used > sym->used) {
2111 /* if none of the liveRanges have a spillLocation then better
2112 to spill this one than anything else already assigned to registers */
2113 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2114 /* if this is local to this block then we might find a block spil */
2115 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2123 if (ic->op == RECEIVE)
2124 debugLog ("When I get clever, I'll optimize the receive logic\n");
2126 /* if we need ptr regs for the right side
2128 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2129 <= (unsigned) PTRSIZE)
2134 /* else we assign registers to it */
2135 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2137 debugLog (" %d - \n", __LINE__);
2139 bitVectDebugOn(_G.regAssigned, debugF);
2140 for (j = 0; j < sym->nRegs; j++)
2142 if (sym->regType == REG_PTR)
2143 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2145 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2147 /* if the allocation failed which means
2148 this was spilt then break */
2152 debugLog (" %d - \n", __LINE__);
2154 /* if it shares registers with operands make sure
2155 that they are in the same position */
2156 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2157 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2158 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2159 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2160 /* do the same for the right operand */
2161 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2162 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2163 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2164 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2166 debugLog (" %d - \n", __LINE__);
2169 debugLog (" %d - \n", __LINE__);
2179 /*-----------------------------------------------------------------*/
2180 /* rUmaskForOp :- returns register mask for an operand */
2181 /*-----------------------------------------------------------------*/
2183 rUmaskForOp (operand * op)
2189 debugLog ("%s\n", __FUNCTION__);
2190 /* only temporaries are assigned registers */
2194 sym = OP_SYMBOL (op);
2196 /* if spilt or no registers assigned to it
2198 if (sym->isspilt || !sym->nRegs)
2201 rumask = newBitVect (pic14_nRegs);
2203 for (j = 0; j < sym->nRegs; j++)
2205 rumask = bitVectSetBit (rumask,
2206 sym->regs[j]->rIdx);
2212 /*-----------------------------------------------------------------*/
2213 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2214 /*-----------------------------------------------------------------*/
2216 regsUsedIniCode (iCode * ic)
2218 bitVect *rmask = newBitVect (pic14_nRegs);
2220 debugLog ("%s\n", __FUNCTION__);
2221 /* do the special cases first */
2224 rmask = bitVectUnion (rmask,
2225 rUmaskForOp (IC_COND (ic)));
2229 /* for the jumptable */
2230 if (ic->op == JUMPTABLE)
2232 rmask = bitVectUnion (rmask,
2233 rUmaskForOp (IC_JTCOND (ic)));
2238 /* of all other cases */
2240 rmask = bitVectUnion (rmask,
2241 rUmaskForOp (IC_LEFT (ic)));
2245 rmask = bitVectUnion (rmask,
2246 rUmaskForOp (IC_RIGHT (ic)));
2249 rmask = bitVectUnion (rmask,
2250 rUmaskForOp (IC_RESULT (ic)));
2256 /*-----------------------------------------------------------------*/
2257 /* createRegMask - for each instruction will determine the regsUsed */
2258 /*-----------------------------------------------------------------*/
2260 createRegMask (eBBlock ** ebbs, int count)
2264 debugLog ("%s\n", __FUNCTION__);
2265 /* for all blocks */
2266 for (i = 0; i < count; i++)
2270 if (ebbs[i]->noPath &&
2271 (ebbs[i]->entryLabel != entryLabel &&
2272 ebbs[i]->entryLabel != returnLabel))
2275 /* for all instructions */
2276 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2281 if (SKIP_IC2 (ic) || !ic->rlive)
2284 /* first mark the registers used in this
2286 ic->rUsed = regsUsedIniCode (ic);
2287 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2289 /* now create the register mask for those
2290 registers that are in use : this is a
2291 super set of ic->rUsed */
2292 ic->rMask = newBitVect (pic14_nRegs + 1);
2294 /* for all live Ranges alive at this point */
2295 for (j = 1; j < ic->rlive->size; j++)
2300 /* if not alive then continue */
2301 if (!bitVectBitValue (ic->rlive, j))
2304 /* find the live range we are interested in */
2305 if (!(sym = hTabItemWithKey (liveRanges, j)))
2307 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2308 "createRegMask cannot find live range");
2312 /* if no register assigned to it */
2313 if (!sym->nRegs || sym->isspilt)
2316 /* for all the registers allocated to it */
2317 for (k = 0; k < sym->nRegs; k++)
2320 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2326 /*-----------------------------------------------------------------*/
2327 /* rematStr - returns the rematerialized string for a remat var */
2328 /*-----------------------------------------------------------------*/
2330 rematStr (symbol * sym)
2333 iCode *ic = sym->rematiCode;
2334 symbol *psym = NULL;
2336 debugLog ("%s\n", __FUNCTION__);
2338 //printf ("%s\n", s);
2340 /* if plus or minus print the right hand side */
2342 if (ic->op == '+' || ic->op == '-') {
2344 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2346 sprintf (s, "(%s %c 0x%04x)",
2347 OP_SYMBOL (IC_LEFT (ric))->rname,
2349 (int) operandLitValue (IC_RIGHT (ic)));
2352 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2354 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2355 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2360 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2361 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2363 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2368 /*-----------------------------------------------------------------*/
2369 /* rematStr - returns the rematerialized string for a remat var */
2370 /*-----------------------------------------------------------------*/
2372 rematStr (symbol * sym)
2375 iCode *ic = sym->rematiCode;
2377 debugLog ("%s\n", __FUNCTION__);
2382 /* if plus or minus print the right hand side */
2384 if (ic->op == '+' || ic->op == '-') {
2385 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2388 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2392 if (ic->op == '+' || ic->op == '-')
2394 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2395 sprintf (s, "(%s %c 0x%04x)",
2396 OP_SYMBOL (IC_LEFT (ric))->rname,
2398 (int) operandLitValue (IC_RIGHT (ic)));
2401 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2403 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2407 /* we reached the end */
2408 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2412 printf ("%s\n", buffer);
2417 /*-----------------------------------------------------------------*/
2418 /* regTypeNum - computes the type & number of registers required */
2419 /*-----------------------------------------------------------------*/
2427 debugLog ("%s\n", __FUNCTION__);
2428 /* for each live range do */
2429 for (sym = hTabFirstItem (liveRanges, &k); sym;
2430 sym = hTabNextItem (liveRanges, &k)) {
2432 debugLog (" %d - %s\n", __LINE__, sym->rname);
2434 /* if used zero times then no registers needed */
2435 if ((sym->liveTo - sym->liveFrom) == 0)
2439 /* if the live range is a temporary */
2442 debugLog (" %d - itemp register\n", __LINE__);
2444 /* if the type is marked as a conditional */
2445 if (sym->regType == REG_CND)
2448 /* if used in return only then we don't
2451 if (IS_AGGREGATE (sym->type) || sym->isptr)
2452 sym->type = aggrToPtr (sym->type, FALSE);
2453 debugLog (" %d - no reg needed - accumulator used\n", __LINE__);
2459 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2460 // sym->type = aggrToPtr (sym->type, FALSE);
2461 debugLog (" %d - used as a return\n", __LINE__);
2466 /* if the symbol has only one definition &
2467 that definition is a get_pointer and the
2468 pointer we are getting is rematerializable and
2471 if (bitVectnBitsOn (sym->defs) == 1 &&
2472 (ic = hTabItemWithKey (iCodehTab,
2473 bitVectFirstBit (sym->defs))) &&
2476 !IS_BITVAR (sym->etype)) {
2479 debugLog (" %d - \n", __LINE__);
2481 /* if remat in data space */
2482 if (OP_SYMBOL (IC_LEFT (ic))->remat &&
2483 DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER) {
2485 /* create a psuedo symbol & force a spil */
2486 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2487 symbol *psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2488 psym->type = sym->type;
2489 psym->etype = sym->etype;
2490 strcpy (psym->rname, psym->name);
2492 sym->usl.spillLoc = psym;
2496 /* if in data space or idata space then try to
2497 allocate pointer register */
2501 /* if not then we require registers */
2502 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2503 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2504 getSize (sym->type));
2507 if(IS_PTR_CONST (sym->type)) {
2508 debugLog (" %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2512 if (sym->nRegs > 4) {
2513 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2514 printTypeChain (sym->type, stderr);
2515 fprintf (stderr, "\n");
2518 /* determine the type of register required */
2519 if (sym->nRegs == 1 &&
2520 IS_PTR (sym->type) &&
2522 sym->regType = REG_PTR;
2524 sym->regType = REG_GPR;
2527 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2531 /* for the first run we don't provide */
2532 /* registers for true symbols we will */
2533 /* see how things go */
2538 DEFSETFUNC (markRegFree)
2540 ((regs *)item)->isFree = 1;
2545 DEFSETFUNC (deallocReg)
2547 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2548 ((regs *)item)->isFree = 1;
2549 ((regs *)item)->wasUsed = 0;
2553 /*-----------------------------------------------------------------*/
2554 /* freeAllRegs - mark all registers as free */
2555 /*-----------------------------------------------------------------*/
2557 pic14_freeAllRegs ()
2561 debugLog ("%s\n", __FUNCTION__);
2563 applyToSet(dynAllocRegs,markRegFree);
2564 applyToSet(dynStackRegs,markRegFree);
2567 for (i = 0; i < pic14_nRegs; i++)
2568 regspic14[i].isFree = 1;
2572 /*-----------------------------------------------------------------*/
2573 /*-----------------------------------------------------------------*/
2575 pic14_deallocateAllRegs ()
2579 debugLog ("%s\n", __FUNCTION__);
2581 applyToSet(dynAllocRegs,deallocReg);
2584 for (i = 0; i < pic14_nRegs; i++) {
2585 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2586 regspic14[i].isFree = 1;
2587 regspic14[i].wasUsed = 0;
2594 /*-----------------------------------------------------------------*/
2595 /* deallocStackSpil - this will set the stack pointer back */
2596 /*-----------------------------------------------------------------*/
2598 DEFSETFUNC (deallocStackSpil)
2602 debugLog ("%s\n", __FUNCTION__);
2607 /*-----------------------------------------------------------------*/
2608 /* farSpacePackable - returns the packable icode for far variables */
2609 /*-----------------------------------------------------------------*/
2611 farSpacePackable (iCode * ic)
2615 debugLog ("%s\n", __FUNCTION__);
2616 /* go thru till we find a definition for the
2617 symbol on the right */
2618 for (dic = ic->prev; dic; dic = dic->prev)
2621 /* if the definition is a call then no */
2622 if ((dic->op == CALL || dic->op == PCALL) &&
2623 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2628 /* if shift by unknown amount then not */
2629 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2630 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2633 /* if pointer get and size > 1 */
2634 if (POINTER_GET (dic) &&
2635 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2638 if (POINTER_SET (dic) &&
2639 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2642 /* if any three is a true symbol in far space */
2643 if (IC_RESULT (dic) &&
2644 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2645 isOperandInFarSpace (IC_RESULT (dic)))
2648 if (IC_RIGHT (dic) &&
2649 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2650 isOperandInFarSpace (IC_RIGHT (dic)) &&
2651 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2654 if (IC_LEFT (dic) &&
2655 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2656 isOperandInFarSpace (IC_LEFT (dic)) &&
2657 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2660 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2662 if ((dic->op == LEFT_OP ||
2663 dic->op == RIGHT_OP ||
2665 IS_OP_LITERAL (IC_RIGHT (dic)))
2675 /*-----------------------------------------------------------------*/
2676 /* packRegsForAssign - register reduction for assignment */
2677 /*-----------------------------------------------------------------*/
2679 packRegsForAssign (iCode * ic, eBBlock * ebp)
2684 debugLog ("%s\n", __FUNCTION__);
2686 debugAopGet (" result:", IC_RESULT (ic));
2687 debugAopGet (" left:", IC_LEFT (ic));
2688 debugAopGet (" right:", IC_RIGHT (ic));
2690 /* if this is at an absolute address, then get the address. */
2691 if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2692 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2693 debugLog (" %d - found config word declaration\n", __LINE__);
2694 if(IS_VALOP(IC_RIGHT(ic))) {
2695 debugLog (" setting config word to %x\n",
2696 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2697 assignConfigWordValue( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2698 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2701 /* remove the assignment from the iCode chain. */
2703 remiCodeFromeBBlock (ebp, ic);
2704 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2705 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2712 if (!IS_ITEMP (IC_RESULT (ic))) {
2713 allocDirReg(IC_RESULT (ic));
2714 debugLog (" %d - result is not temp\n", __LINE__);
2717 if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2718 debugLog (" %d - left is not temp, allocating\n", __LINE__);
2719 allocDirReg(IC_LEFT (ic));
2723 if (!IS_ITEMP (IC_RIGHT (ic))) {
2724 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2726 /* only pack if this is not a function pointer */
2727 if (!IS_REF (IC_RIGHT (ic)))
2728 allocDirReg(IC_RIGHT (ic));
2732 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2733 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2735 debugLog (" %d - not packing - right side fails \n", __LINE__);
2739 /* if the true symbol is defined in far space or on stack
2740 then we should not since this will increase register pressure */
2741 if (isOperandInFarSpace (IC_RESULT (ic)))
2743 if ((dic = farSpacePackable (ic)))
2749 /* find the definition of iTempNN scanning backwards if we find a
2750 a use of the true symbol before we find the definition then
2752 for (dic = ic->prev; dic; dic = dic->prev)
2755 /* if there is a function call and this is
2756 a parameter & not my parameter then don't pack it */
2757 if ((dic->op == CALL || dic->op == PCALL) &&
2758 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2759 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2761 debugLog (" %d - \n", __LINE__);
2769 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2770 IS_OP_VOLATILE (IC_RESULT (dic)))
2772 debugLog (" %d - dic is VOLATILE \n", __LINE__);
2777 if (IS_SYMOP (IC_RESULT (dic)) &&
2778 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2780 /* A previous result was assigned to the same register - we'll our definition */
2781 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
2782 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
2783 if (POINTER_SET (dic))
2789 if (IS_SYMOP (IC_RIGHT (dic)) &&
2790 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
2791 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2793 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
2798 if (IS_SYMOP (IC_LEFT (dic)) &&
2799 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2800 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2802 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
2807 if (POINTER_SET (dic) &&
2808 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
2810 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
2818 return 0; /* did not find */
2820 /* if the result is on stack or iaccess then it must be
2821 the same atleast one of the operands */
2822 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
2823 OP_SYMBOL (IC_RESULT (ic))->iaccess)
2826 /* the operation has only one symbol
2827 operator then we can pack */
2828 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
2829 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
2832 if (!((IC_LEFT (dic) &&
2833 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
2835 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
2839 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
2840 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
2841 /* found the definition */
2842 /* replace the result with the result of */
2843 /* this assignment and remove this assignment */
2844 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
2845 IC_RESULT (dic) = IC_RESULT (ic);
2847 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
2849 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
2851 /* delete from liverange table also
2852 delete from all the points inbetween and the new
2854 for (sic = dic; sic != ic; sic = sic->next)
2856 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
2857 if (IS_ITEMP (IC_RESULT (dic)))
2858 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
2861 remiCodeFromeBBlock (ebp, ic);
2862 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2863 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2864 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2870 /*-----------------------------------------------------------------*/
2871 /* findAssignToSym : scanning backwards looks for first assig found */
2872 /*-----------------------------------------------------------------*/
2874 findAssignToSym (operand * op, iCode * ic)
2878 debugLog ("%s\n", __FUNCTION__);
2879 for (dic = ic->prev; dic; dic = dic->prev)
2882 /* if definition by assignment */
2883 if (dic->op == '=' &&
2884 !POINTER_SET (dic) &&
2885 IC_RESULT (dic)->key == op->key
2886 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
2890 /* we are interested only if defined in far space */
2891 /* or in stack space in case of + & - */
2893 /* if assigned to a non-symbol then return
2895 if (!IS_SYMOP (IC_RIGHT (dic)))
2898 /* if the symbol is in far space then
2900 if (isOperandInFarSpace (IC_RIGHT (dic)))
2903 /* for + & - operations make sure that
2904 if it is on the stack it is the same
2905 as one of the three operands */
2906 if ((ic->op == '+' || ic->op == '-') &&
2907 OP_SYMBOL (IC_RIGHT (dic))->onStack)
2910 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
2911 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
2912 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
2920 /* if we find an usage then we cannot delete it */
2921 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
2924 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
2927 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
2931 /* now make sure that the right side of dic
2932 is not defined between ic & dic */
2935 iCode *sic = dic->next;
2937 for (; sic != ic; sic = sic->next)
2938 if (IC_RESULT (sic) &&
2939 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
2948 /*-----------------------------------------------------------------*/
2949 /* packRegsForSupport :- reduce some registers for support calls */
2950 /*-----------------------------------------------------------------*/
2952 packRegsForSupport (iCode * ic, eBBlock * ebp)
2956 debugLog ("%s\n", __FUNCTION__);
2957 /* for the left & right operand :- look to see if the
2958 left was assigned a true symbol in far space in that
2959 case replace them */
2960 if (IS_ITEMP (IC_LEFT (ic)) &&
2961 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
2963 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
2969 debugAopGet ("removing left:", IC_LEFT (ic));
2971 /* found it we need to remove it from the
2973 for (sic = dic; sic != ic; sic = sic->next)
2974 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
2976 IC_LEFT (ic)->operand.symOperand =
2977 IC_RIGHT (dic)->operand.symOperand;
2978 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
2979 remiCodeFromeBBlock (ebp, dic);
2980 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
2981 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2985 /* do the same for the right operand */
2988 IS_ITEMP (IC_RIGHT (ic)) &&
2989 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
2991 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
2997 /* if this is a subtraction & the result
2998 is a true symbol in far space then don't pack */
2999 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3001 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3002 if (IN_FARSPACE (SPEC_OCLS (etype)))
3006 debugAopGet ("removing right:", IC_RIGHT (ic));
3008 /* found it we need to remove it from the
3010 for (sic = dic; sic != ic; sic = sic->next)
3011 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3013 IC_RIGHT (ic)->operand.symOperand =
3014 IC_RIGHT (dic)->operand.symOperand;
3015 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3017 remiCodeFromeBBlock (ebp, dic);
3018 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3019 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3026 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3029 /*-----------------------------------------------------------------*/
3030 /* packRegsForOneuse : - will reduce some registers for single Use */
3031 /*-----------------------------------------------------------------*/
3033 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3038 debugLog ("%s\n", __FUNCTION__);
3039 /* if returning a literal then do nothing */
3043 /* only upto 2 bytes since we cannot predict
3044 the usage of b, & acc */
3045 if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3050 /* this routine will mark the a symbol as used in one
3051 instruction use only && if the definition is local
3052 (ie. within the basic block) && has only one definition &&
3053 that definition is either a return value from a
3054 function or does not contain any variables in
3056 uses = bitVectCopy (OP_USES (op));
3057 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3058 if (!bitVectIsZero (uses)) /* has other uses */
3061 /* if it has only one defintion */
3062 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3063 return NULL; /* has more than one definition */
3065 /* get that definition */
3067 hTabItemWithKey (iCodehTab,
3068 bitVectFirstBit (OP_DEFS (op)))))
3071 /* found the definition now check if it is local */
3072 if (dic->seq < ebp->fSeq ||
3073 dic->seq > ebp->lSeq)
3074 return NULL; /* non-local */
3076 /* now check if it is the return from
3078 if (dic->op == CALL || dic->op == PCALL)
3080 if (ic->op != SEND && ic->op != RETURN &&
3081 !POINTER_SET(ic) && !POINTER_GET(ic))
3083 OP_SYMBOL (op)->ruonly = 1;
3090 /* otherwise check that the definition does
3091 not contain any symbols in far space */
3092 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3093 isOperandInFarSpace (IC_RIGHT (dic)) ||
3094 IS_OP_RUONLY (IC_LEFT (ic)) ||
3095 IS_OP_RUONLY (IC_RIGHT (ic)))
3100 /* if pointer set then make sure the pointer
3102 if (POINTER_SET (dic) &&
3103 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3106 if (POINTER_GET (dic) &&
3107 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3112 /* also make sure the intervenening instructions
3113 don't have any thing in far space */
3114 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3117 /* if there is an intervening function call then no */
3118 if (dic->op == CALL || dic->op == PCALL)
3120 /* if pointer set then make sure the pointer
3122 if (POINTER_SET (dic) &&
3123 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3126 if (POINTER_GET (dic) &&
3127 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3130 /* if address of & the result is remat then okay */
3131 if (dic->op == ADDRESS_OF &&
3132 OP_SYMBOL (IC_RESULT (dic))->remat)
3135 /* if operand has size of three or more & this
3136 operation is a '*','/' or '%' then 'b' may
3138 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3139 getSize (operandType (op)) >= 3)
3142 /* if left or right or result is in far space */
3143 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3144 isOperandInFarSpace (IC_RIGHT (dic)) ||
3145 isOperandInFarSpace (IC_RESULT (dic)) ||
3146 IS_OP_RUONLY (IC_LEFT (dic)) ||
3147 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3148 IS_OP_RUONLY (IC_RESULT (dic)))
3154 OP_SYMBOL (op)->ruonly = 1;
3159 /*-----------------------------------------------------------------*/
3160 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3161 /*-----------------------------------------------------------------*/
3163 isBitwiseOptimizable (iCode * ic)
3165 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3166 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3168 debugLog ("%s\n", __FUNCTION__);
3169 /* bitwise operations are considered optimizable
3170 under the following conditions (Jean-Louis VERN)
3182 if (IS_LITERAL (rtype) ||
3183 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3189 /*-----------------------------------------------------------------*/
3190 /* packRegsForAccUse - pack registers for acc use */
3191 /*-----------------------------------------------------------------*/
3193 packRegsForAccUse (iCode * ic)
3197 debugLog ("%s\n", __FUNCTION__);
3199 /* if this is an aggregate, e.g. a one byte char array */
3200 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3203 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3205 /* if + or - then it has to be one byte result */
3206 if ((ic->op == '+' || ic->op == '-')
3207 && getSize (operandType (IC_RESULT (ic))) > 1)
3210 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3211 /* if shift operation make sure right side is not a literal */
3212 if (ic->op == RIGHT_OP &&
3213 (isOperandLiteral (IC_RIGHT (ic)) ||
3214 getSize (operandType (IC_RESULT (ic))) > 1))
3217 if (ic->op == LEFT_OP &&
3218 (isOperandLiteral (IC_RIGHT (ic)) ||
3219 getSize (operandType (IC_RESULT (ic))) > 1))
3222 if (IS_BITWISE_OP (ic) &&
3223 getSize (operandType (IC_RESULT (ic))) > 1)
3227 /* has only one definition */
3228 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3231 /* has only one use */
3232 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3235 /* and the usage immediately follows this iCode */
3236 if (!(uic = hTabItemWithKey (iCodehTab,
3237 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3240 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3241 if (ic->next != uic)
3244 /* if it is a conditional branch then we definitely can */
3248 if (uic->op == JUMPTABLE)
3251 /* if the usage is not is an assignment
3252 or an arithmetic / bitwise / shift operation then not */
3253 if (POINTER_SET (uic) &&
3254 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3257 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3258 if (uic->op != '=' &&
3259 !IS_ARITHMETIC_OP (uic) &&
3260 !IS_BITWISE_OP (uic) &&
3261 uic->op != LEFT_OP &&
3262 uic->op != RIGHT_OP)
3265 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3266 /* if used in ^ operation then make sure right is not a
3268 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3271 /* if shift operation make sure right side is not a literal */
3272 if (uic->op == RIGHT_OP &&
3273 (isOperandLiteral (IC_RIGHT (uic)) ||
3274 getSize (operandType (IC_RESULT (uic))) > 1))
3277 if (uic->op == LEFT_OP &&
3278 (isOperandLiteral (IC_RIGHT (uic)) ||
3279 getSize (operandType (IC_RESULT (uic))) > 1))
3282 /* make sure that the result of this icode is not on the
3283 stack, since acc is used to compute stack offset */
3284 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3285 OP_SYMBOL (IC_RESULT (uic))->onStack)
3288 /* if either one of them in far space then we cannot */
3289 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3290 isOperandInFarSpace (IC_LEFT (uic))) ||
3291 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3292 isOperandInFarSpace (IC_RIGHT (uic))))
3295 /* if the usage has only one operand then we can */
3296 if (IC_LEFT (uic) == NULL ||
3297 IC_RIGHT (uic) == NULL)
3300 /* make sure this is on the left side if not
3301 a '+' since '+' is commutative */
3302 if (ic->op != '+' &&
3303 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3306 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3307 /* if one of them is a literal then we can */
3308 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3309 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3310 (getSize (operandType (IC_RESULT (uic))) <= 1))
3312 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3316 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3317 /* if the other one is not on stack then we can */
3318 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3319 (IS_ITEMP (IC_RIGHT (uic)) ||
3320 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3321 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3324 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3325 (IS_ITEMP (IC_LEFT (uic)) ||
3326 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3327 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3333 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3334 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3339 /*-----------------------------------------------------------------*/
3340 /* packForPush - hueristics to reduce iCode for pushing */
3341 /*-----------------------------------------------------------------*/
3343 packForReceive (iCode * ic, eBBlock * ebp)
3347 debugLog ("%s\n", __FUNCTION__);
3348 debugAopGet (" result:", IC_RESULT (ic));
3349 debugAopGet (" left:", IC_LEFT (ic));
3350 debugAopGet (" right:", IC_RIGHT (ic));
3355 for (dic = ic->next; dic; dic = dic->next)
3360 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3361 debugLog (" used on left\n");
3362 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3363 debugLog (" used on right\n");
3364 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3365 debugLog (" used on result\n");
3367 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3368 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3373 debugLog (" hey we can remove this unnecessary assign\n");
3375 /*-----------------------------------------------------------------*/
3376 /* packForPush - hueristics to reduce iCode for pushing */
3377 /*-----------------------------------------------------------------*/
3379 packForPush (iCode * ic, eBBlock * ebp)
3383 debugLog ("%s\n", __FUNCTION__);
3384 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3387 /* must have only definition & one usage */
3388 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3389 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3392 /* find the definition */
3393 if (!(dic = hTabItemWithKey (iCodehTab,
3394 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3397 if (dic->op != '=' || POINTER_SET (dic))
3400 /* we now we know that it has one & only one def & use
3401 and the that the definition is an assignment */
3402 IC_LEFT (ic) = IC_RIGHT (dic);
3404 remiCodeFromeBBlock (ebp, dic);
3405 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3406 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3409 void printSymType(char * str, sym_link *sl)
3411 debugLog (" %s Symbol type: ",str);
3412 printTypeChain( sl, debugF);
3417 /*-----------------------------------------------------------------*/
3418 /* some debug code to print the symbol S_TYPE. Note that
3419 * the function checkSClass in src/SDCCsymt.c dinks with
3420 * the S_TYPE in ways the PIC port doesn't fully like...*/
3421 /*-----------------------------------------------------------------*/
3422 void isData(sym_link *sl)
3432 for ( ; sl; sl=sl->next) {
3434 switch (SPEC_SCLS(sl)) {
3436 case S_DATA: fprintf (of, "data "); break;
3437 case S_XDATA: fprintf (of, "xdata "); break;
3438 case S_SFR: fprintf (of, "sfr "); break;
3439 case S_SBIT: fprintf (of, "sbit "); break;
3440 case S_CODE: fprintf (of, "code "); break;
3441 case S_IDATA: fprintf (of, "idata "); break;
3442 case S_PDATA: fprintf (of, "pdata "); break;
3443 case S_LITERAL: fprintf (of, "literal "); break;
3444 case S_STACK: fprintf (of, "stack "); break;
3445 case S_XSTACK: fprintf (of, "xstack "); break;
3446 case S_BIT: fprintf (of, "bit "); break;
3447 case S_EEPROM: fprintf (of, "eeprom "); break;
3456 /*-----------------------------------------------------------------*/
3457 /* packRegisters - does some transformations to reduce register */
3459 /*-----------------------------------------------------------------*/
3461 packRegisters (eBBlock * ebp)
3466 debugLog ("%s\n", __FUNCTION__);
3472 /* look for assignments of the form */
3473 /* iTempNN = TRueSym (someoperation) SomeOperand */
3475 /* TrueSym := iTempNN:1 */
3476 for (ic = ebp->sch; ic; ic = ic->next)
3479 /* find assignment of the form TrueSym := iTempNN:1 */
3480 if (ic->op == '=' && !POINTER_SET (ic))
3481 change += packRegsForAssign (ic, ebp);
3485 if (POINTER_SET (ic))
3486 debugLog ("pointer is set\n");
3487 debugAopGet (" result:", IC_RESULT (ic));
3488 debugAopGet (" left:", IC_LEFT (ic));
3489 debugAopGet (" right:", IC_RIGHT (ic));
3498 for (ic = ebp->sch; ic; ic = ic->next) {
3500 if(IS_SYMOP ( IC_LEFT(ic))) {
3501 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3503 debugAopGet (" left:", IC_LEFT (ic));
3504 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3505 debugLog (" is a pointer\n");
3507 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3508 debugLog (" is volatile\n");
3512 printSymType(" ", OP_SYMBOL(IC_LEFT(ic))->type);
3515 if(IS_SYMOP ( IC_RIGHT(ic))) {
3516 debugAopGet (" right:", IC_RIGHT (ic));
3517 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3520 if(IS_SYMOP ( IC_RESULT(ic))) {
3521 debugAopGet (" result:", IC_RESULT (ic));
3522 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3525 if (POINTER_SET (ic))
3526 debugLog (" %d - Pointer set\n", __LINE__);
3529 /* if this is an itemp & result of a address of a true sym
3530 then mark this as rematerialisable */
3531 if (ic->op == ADDRESS_OF &&
3532 IS_ITEMP (IC_RESULT (ic)) &&
3533 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3534 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3535 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3538 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3540 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3541 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3542 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3546 /* if straight assignment then carry remat flag if
3547 this is the only definition */
3548 if (ic->op == '=' &&
3549 !POINTER_SET (ic) &&
3550 IS_SYMOP (IC_RIGHT (ic)) &&
3551 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3552 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3554 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3556 OP_SYMBOL (IC_RESULT (ic))->remat =
3557 OP_SYMBOL (IC_RIGHT (ic))->remat;
3558 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3559 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3562 /* if this is a +/- operation with a rematerizable
3563 then mark this as rematerializable as well */
3564 if ((ic->op == '+' || ic->op == '-') &&
3565 (IS_SYMOP (IC_LEFT (ic)) &&
3566 IS_ITEMP (IC_RESULT (ic)) &&
3567 OP_SYMBOL (IC_LEFT (ic))->remat &&
3568 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3569 IS_OP_LITERAL (IC_RIGHT (ic))))
3571 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3573 operandLitValue (IC_RIGHT (ic));
3574 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3575 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3576 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3579 /* mark the pointer usages */
3580 if (POINTER_SET (ic))
3582 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3583 debugLog (" marking as a pointer (set) =>");
3584 debugAopGet (" result:", IC_RESULT (ic));
3586 if (POINTER_GET (ic))
3588 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3589 debugLog (" marking as a pointer (get) =>");
3590 debugAopGet (" left:", IC_LEFT (ic));
3595 /* if we are using a symbol on the stack
3596 then we should say pic14_ptrRegReq */
3597 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3598 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3599 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3600 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3601 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3602 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3605 if (IS_SYMOP (IC_LEFT (ic)))
3606 pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3607 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3608 if (IS_SYMOP (IC_RIGHT (ic)))
3609 pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3610 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3611 if (IS_SYMOP (IC_RESULT (ic)))
3612 pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3613 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3616 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3620 /* if the condition of an if instruction
3621 is defined in the previous instruction then
3622 mark the itemp as a conditional */
3623 if ((IS_CONDITIONAL (ic) ||
3624 ((ic->op == BITWISEAND ||
3627 isBitwiseOptimizable (ic))) &&
3628 ic->next && ic->next->op == IFX &&
3629 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3630 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3633 debugLog (" %d\n", __LINE__);
3634 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3638 /* reduce for support function calls */
3639 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3640 packRegsForSupport (ic, ebp);
3642 /* if a parameter is passed, it's in W, so we may not
3643 need to place a copy in a register */
3644 if (ic->op == RECEIVE)
3645 packForReceive (ic, ebp);
3647 /* some cases the redundant moves can
3648 can be eliminated for return statements */
3649 if ((ic->op == RETURN || ic->op == SEND) &&
3650 !isOperandInFarSpace (IC_LEFT (ic)) &&
3652 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3654 /* if pointer set & left has a size more than
3655 one and right is not in far space */
3656 if (POINTER_SET (ic) &&
3657 !isOperandInFarSpace (IC_RIGHT (ic)) &&
3658 !OP_SYMBOL (IC_RESULT (ic))->remat &&
3659 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3660 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3662 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3664 /* if pointer get */
3665 if (POINTER_GET (ic) &&
3666 !isOperandInFarSpace (IC_RESULT (ic)) &&
3667 !OP_SYMBOL (IC_LEFT (ic))->remat &&
3668 !IS_OP_RUONLY (IC_RESULT (ic)) &&
3669 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3671 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3674 /* if this is cast for intergral promotion then
3675 check if only use of the definition of the
3676 operand being casted/ if yes then replace
3677 the result of that arithmetic operation with
3678 this result and get rid of the cast */
3679 if (ic->op == CAST) {
3681 sym_link *fromType = operandType (IC_RIGHT (ic));
3682 sym_link *toType = operandType (IC_LEFT (ic));
3684 debugLog (" %d - casting\n", __LINE__);
3686 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3687 getSize (fromType) != getSize (toType)) {
3690 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3693 if (IS_ARITHMETIC_OP (dic)) {
3695 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3696 IC_RESULT (dic) = IC_RESULT (ic);
3697 remiCodeFromeBBlock (ebp, ic);
3698 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3699 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3700 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3704 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3708 /* if the type from and type to are the same
3709 then if this is the only use then packit */
3710 if (compareType (operandType (IC_RIGHT (ic)),
3711 operandType (IC_LEFT (ic))) == 1) {
3713 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3716 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3717 IC_RESULT (dic) = IC_RESULT (ic);
3718 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3719 remiCodeFromeBBlock (ebp, ic);
3720 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3721 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3729 iTempNN := (some variable in farspace) V1
3734 if (ic->op == IPUSH)
3736 packForPush (ic, ebp);
3740 /* pack registers for accumulator use, when the
3741 result of an arithmetic or bit wise operation
3742 has only one use, that use is immediately following
3743 the defintion and the using iCode has only one
3744 operand or has two operands but one is literal &
3745 the result of that operation is not on stack then
3746 we can leave the result of this operation in acc:b
3748 if ((IS_ARITHMETIC_OP (ic)
3750 || IS_BITWISE_OP (ic)
3752 || ic->op == LEFT_OP || ic->op == RIGHT_OP
3755 IS_ITEMP (IC_RESULT (ic)) &&
3756 getSize (operandType (IC_RESULT (ic))) <= 2)
3758 packRegsForAccUse (ic);
3764 dumpEbbsToDebug (eBBlock ** ebbs, int count)
3768 if (!debug || !debugF)
3771 for (i = 0; i < count; i++)
3773 fprintf (debugF, "\n----------------------------------------------------------------\n");
3774 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
3775 ebbs[i]->entryLabel->name,
3778 ebbs[i]->isLastInLoop);
3779 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
3784 fprintf (debugF, "visited %d : hasFcall = %d\n",
3788 fprintf (debugF, "\ndefines bitVector :");
3789 bitVectDebugOn (ebbs[i]->defSet, debugF);
3790 fprintf (debugF, "\nlocal defines bitVector :");
3791 bitVectDebugOn (ebbs[i]->ldefs, debugF);
3792 fprintf (debugF, "\npointers Set bitvector :");
3793 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
3794 fprintf (debugF, "\nin pointers Set bitvector :");
3795 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
3796 fprintf (debugF, "\ninDefs Set bitvector :");
3797 bitVectDebugOn (ebbs[i]->inDefs, debugF);
3798 fprintf (debugF, "\noutDefs Set bitvector :");
3799 bitVectDebugOn (ebbs[i]->outDefs, debugF);
3800 fprintf (debugF, "\nusesDefs Set bitvector :");
3801 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
3802 fprintf (debugF, "\n----------------------------------------------------------------\n");
3803 printiCChain (ebbs[i]->sch, debugF);
3806 /*-----------------------------------------------------------------*/
3807 /* assignRegisters - assigns registers to each live range as need */
3808 /*-----------------------------------------------------------------*/
3810 pic14_assignRegisters (eBBlock ** ebbs, int count)
3815 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
3816 debugLog ("\nebbs before optimizing:\n");
3817 dumpEbbsToDebug (ebbs, count);
3819 setToNull ((void *) &_G.funcrUsed);
3820 pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
3823 /* change assignments this will remove some
3824 live ranges reducing some register pressure */
3825 for (i = 0; i < count; i++)
3826 packRegisters (ebbs[i]);
3833 debugLog("dir registers allocated so far:\n");
3834 reg = hTabFirstItem(dynDirectRegNames, &hkey);
3837 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
3838 reg = hTabNextItem(dynDirectRegNames, &hkey);
3843 if (options.dump_pack)
3844 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
3846 /* first determine for each live range the number of
3847 registers & the type of registers required for each */
3850 /* and serially allocate registers */
3851 serialRegAssign (ebbs, count);
3853 /* if stack was extended then tell the user */
3856 /* werror(W_TOOMANY_SPILS,"stack", */
3857 /* _G.stackExtend,currFunc->name,""); */
3863 /* werror(W_TOOMANY_SPILS,"data space", */
3864 /* _G.dataExtend,currFunc->name,""); */
3868 /* after that create the register mask
3869 for each of the instruction */
3870 createRegMask (ebbs, count);
3872 /* redo that offsets for stacked automatic variables */
3873 redoStackOffsets ();
3875 if (options.dump_rassgn)
3876 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
3878 /* now get back the chain */
3879 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
3881 debugLog ("ebbs after optimizing:\n");
3882 dumpEbbsToDebug (ebbs, count);
3887 /* free up any _G.stackSpil locations allocated */
3888 applyToSet (_G.stackSpil, deallocStackSpil);
3890 setToNull ((void **) &_G.stackSpil);
3891 setToNull ((void **) &_G.spiltSet);
3892 /* mark all registers as free */
3893 //pic14_freeAllRegs ();
3895 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");