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, "unknown 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);
453 dReg->name = Safe_strdup(buffer);
455 //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 /* regWithName - Search through a set of registers that matches name */
500 /*-----------------------------------------------------------------*/
502 regWithName (set *dRegs, const char *name)
506 for (dReg = setFirstItem(dRegs) ; dReg ;
507 dReg = setNextItem(dRegs)) {
509 if((strcmp(name,dReg->name)==0)) {
517 /*-----------------------------------------------------------------*/
518 /* regWithName - Search for a registers that matches name */
519 /*-----------------------------------------------------------------*/
521 regFindWithName (const char *name)
525 if( (dReg = regWithName ( dynDirectRegs, name)) != NULL ) {
526 debugLog ("Found a Direct Register!\n");
529 if( (dReg = regWithName ( dynDirectBitRegs, name)) != NULL) {
530 debugLog ("Found a Direct Bit Register!\n");
534 if (*name=='_') name++; // Step passed '_'
536 if( (dReg = regWithName ( dynAllocRegs, name)) != NULL) {
537 debugLog ("Found a Dynamic Register!\n");
540 if( (dReg = regWithName ( dynProcessorRegs, name)) != NULL) {
541 debugLog ("Found a Processor Register!\n");
544 if( (dReg = regWithName ( dynInternalRegs, name)) != NULL) {
545 debugLog ("Found an Internal Register!\n");
548 if( (dReg = regWithName ( dynStackRegs, name)) != NULL) {
549 debugLog ("Found an Stack Register!\n");
556 /*-----------------------------------------------------------------*/
557 /* regFindFree - Search for a free register in a set of registers */
558 /*-----------------------------------------------------------------*/
560 regFindFree (set *dRegs)
564 for (dReg = setFirstItem(dRegs) ; dReg ;
565 dReg = setNextItem(dRegs)) {
573 /*-----------------------------------------------------------------*/
574 /* initStack - allocate registers for a psuedo stack */
575 /*-----------------------------------------------------------------*/
576 void initStack(int base_address, int size)
581 Gstack_base_addr = base_address;
582 //fprintf(stderr,"initStack");
584 for(i = 0; i<size; i++) {
585 regs *r = newReg(REG_STK, PO_GPR_TEMP,base_address,NULL,1,0);
586 r->address = base_address; // Pseudo stack needs a fixed location that can be known by all modules
589 r->alias = 0x180; // Using shared memory for pseudo stack
590 addSet(&dynStackRegs,r);
595 /*-----------------------------------------------------------------*
596 *-----------------------------------------------------------------*/
598 allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
601 //fprintf(stderr,"allocProcessorRegister %s addr =0x%x\n",name,rIdx);
602 return addSet(&dynProcessorRegs,newReg(REG_SFR, po_type, rIdx, name,1,alias));
605 /*-----------------------------------------------------------------*
606 *-----------------------------------------------------------------*/
609 allocInternalRegister(int rIdx, char * name, short po_type, int alias)
611 regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias);
613 //fprintf(stderr,"allocInternalRegister %s addr =0x%x\n",name,rIdx);
616 return addSet(&dynInternalRegs,reg);
621 /*-----------------------------------------------------------------*/
622 /* allocReg - allocates register of given type */
623 /*-----------------------------------------------------------------*/
625 allocReg (short type)
628 debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
629 //fprintf(stderr,"allocReg\n");
632 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
637 /*-----------------------------------------------------------------*/
638 /* dirregWithName - search for register by name */
639 /*-----------------------------------------------------------------*/
641 dirregWithName (char *name)
649 /* hash the name to get a key */
651 hkey = regname2key(name);
653 reg = hTabFirstItemWK(dynDirectRegNames, hkey);
657 if(STRCASECMP(reg->name, name) == 0) {
661 reg = hTabNextItemWK (dynDirectRegNames);
665 return NULL; // name wasn't found in the hash table
668 int IS_CONFIG_ADDRESS(int address)
671 return address == 0x2007;
674 /*-----------------------------------------------------------------*/
675 /* allocNewDirReg - allocates a new register of given type */
676 /*-----------------------------------------------------------------*/
678 allocNewDirReg (sym_link *symlnk,const char *name)
683 /* if this is at an absolute address, then get the address. */
684 if (SPEC_ABSA (symlnk) ) {
685 address = SPEC_ADDR (symlnk);
686 //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
689 /* Register wasn't found in hash, so let's create
690 * a new one and put it in the hash table AND in the
691 * dynDirectRegNames set */
692 if (IS_CONFIG_ADDRESS(address)) {
693 debugLog (" -- %s is declared at address 0x2007\n",name);
698 if (IS_BITVAR (symlnk))
705 reg = newReg(REG_GPR, PO_DIR, idx, (char*)name,getSize (symlnk),0 );
706 debugLog (" -- added %s to hash, size = %d\n", (char*)name,reg->size);
708 if (SPEC_ABSA (symlnk) ) {
712 if (IS_BITVAR (symlnk)) {
713 addSet(&dynDirectBitRegs, reg);
716 addSet(&dynDirectRegs, reg);
718 if (!IS_STATIC (symlnk)) {
721 if (IS_EXTERN (symlnk)) {
727 if (address && reg) {
729 reg->address = address;
730 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
736 /*-----------------------------------------------------------------*/
737 /* allocDirReg - allocates register of given type */
738 /*-----------------------------------------------------------------*/
740 allocDirReg (operand *op )
747 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
751 name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
753 /* If the symbol is at a fixed address, then remove the leading underscore
754 * from the name. This is hack to allow the .asm include file named registers
755 * to match the .c declared register names */
757 //if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && (*name == '_'))
760 debugLog ("%s symbol name %s\n", __FUNCTION__,name);
762 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
763 debugLog(" %d const char\n",__LINE__);
764 debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
767 debugLog(" %d storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
768 if (IS_CODE ( OP_SYM_ETYPE(op)) )
769 debugLog(" %d code space\n",__LINE__);
771 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
772 debugLog(" %d integral\n",__LINE__);
773 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
774 debugLog(" %d literal\n",__LINE__);
775 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
776 debugLog(" %d specifier\n",__LINE__);
777 debugAopGet(NULL, op);
780 if (IS_CODE ( OP_SYM_ETYPE(op)) )
783 /* First, search the hash table to see if there is a register with this name */
784 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && !(IS_BITVAR (OP_SYM_ETYPE(op))) ) {
785 reg = regWithIdx (dynProcessorRegs, SPEC_ADDR ( OP_SYM_ETYPE(op)), 1);
788 fprintf(stderr,"ralloc %s is at fixed address but not a processor reg, addr=0x%x\n",
789 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
791 fprintf(stderr,"ralloc %s at fixed address has already been declared, addr=0x%x\n",
792 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
795 //fprintf(stderr,"ralloc:%d %s \n", __LINE__,name);
797 reg = dirregWithName(name);
804 /* if this is at an absolute address, then get the address. */
805 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
806 address = SPEC_ADDR ( OP_SYM_ETYPE(op));
807 //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
810 /* Register wasn't found in hash, so let's create
811 * a new one and put it in the hash table AND in the
812 * dynDirectRegNames set */
813 if(!IS_CONFIG_ADDRESS(address)) {
814 //fprintf(stderr,"allocating new reg %s\n",name);
816 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0 );
817 debugLog (" -- added %s to hash, size = %d\n", name,reg->size);
819 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
821 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
823 //fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
827 if (IS_BITVAR (OP_SYM_ETYPE(op))) {
828 addSet(&dynDirectBitRegs, reg);
831 addSet(&dynDirectRegs, reg);
833 if (!IS_STATIC (OP_SYM_ETYPE(op))) {
836 if (IS_EXTERN (OP_SYM_ETYPE(op))) {
842 debugLog (" -- %s is declared at address 0x2007\n",name);
847 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
849 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
850 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
855 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
857 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
858 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
861 allocNewDirReg (OP_SYM_ETYPE(op),name);
868 /*-----------------------------------------------------------------*/
869 /* allocRegByName - allocates register with given name */
870 /*-----------------------------------------------------------------*/
872 allocRegByName (char *name, int size)
878 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
882 /* First, search the hash table to see if there is a register with this name */
883 reg = dirregWithName(name);
889 /* Register wasn't found in hash, so let's create
890 * a new one and put it in the hash table AND in the
891 * dynDirectRegNames set */
892 //fprintf (stderr,"%s symbol name %s\n", __FUNCTION__,name);
893 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0 );
894 for (sym = setFirstItem(sfr->syms); sym; sym = setNextItem(sfr->syms)) {
895 if (strcmp(reg->name+1,sym->name)==0) {
896 unsigned a = SPEC_ADDR(sym->etype);
900 if (!IS_STATIC (sym->etype)) {
903 if (IS_EXTERN (sym->etype)) {
906 if (IS_BITVAR (sym->etype))
913 for (sym = setFirstItem(data->syms); sym; sym = setNextItem(data->syms)) {
914 if (strcmp(reg->name+1,sym->name)==0) {
915 unsigned a = SPEC_ADDR(sym->etype);
917 if (!IS_STATIC (sym->etype)) {
920 if (IS_EXTERN (sym->etype)) {
923 if (IS_BITVAR (sym->etype))
931 debugLog (" -- added %s to hash, size = %d\n", name,reg->size);
933 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
934 if (reg->isBitField) {
935 addSet(&dynDirectBitRegs, reg);
937 addSet(&dynDirectRegs, reg);
943 /*-----------------------------------------------------------------*/
944 /* RegWithIdx - returns pointer to register with index number */
945 /*-----------------------------------------------------------------*/
947 typeRegWithIdx (int idx, int type, int fixed)
952 debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
957 if( (dReg = regWithIdx ( dynAllocRegs, idx, fixed)) != NULL) {
959 debugLog ("Found a Dynamic Register!\n");
962 if( (dReg = regWithIdx ( dynDirectRegs, idx, fixed)) != NULL ) {
963 debugLog ("Found a Direct Register!\n");
969 if( (dReg = regWithIdx ( dynStackRegs, idx, fixed)) != NULL ) {
970 debugLog ("Found a Stack Register!\n");
975 if( (dReg = regWithIdx ( dynProcessorRegs, idx, fixed)) != NULL ) {
976 debugLog ("Found a Processor Register!\n");
990 /*-----------------------------------------------------------------*/
991 /* pic14_regWithIdx - returns pointer to register with index number*/
992 /*-----------------------------------------------------------------*/
994 pic14_regWithIdx (int idx)
998 if( (dReg = typeRegWithIdx(idx,REG_GPR,0)) != NULL)
1001 if( (dReg = typeRegWithIdx(idx,REG_SFR,0)) != NULL)
1007 /*-----------------------------------------------------------------*/
1008 /* pic14_regWithIdx - returns pointer to register with index number */
1009 /*-----------------------------------------------------------------*/
1011 pic14_allocWithIdx (int idx)
1016 debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
1018 if( (dReg = regWithIdx ( dynAllocRegs, idx,0)) != NULL) {
1020 debugLog ("Found a Dynamic Register!\n");
1021 } else if( (dReg = regWithIdx ( dynStackRegs, idx,0)) != NULL ) {
1022 debugLog ("Found a Stack Register!\n");
1023 } else if( (dReg = regWithIdx ( dynProcessorRegs, idx,0)) != NULL ) {
1024 debugLog ("Found a Processor Register!\n");
1025 } else if( (dReg = regWithIdx ( dynInternalRegs, idx,0)) != NULL ) {
1026 debugLog ("Found an Internal Register!\n");
1027 } else if( (dReg = regWithIdx ( dynInternalRegs, idx,1)) != NULL ) {
1028 debugLog ("Found an Internal Register!\n");
1031 debugLog ("Dynamic Register not found\n");
1034 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
1035 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1036 "regWithIdx not found");
1046 /*-----------------------------------------------------------------*/
1047 /*-----------------------------------------------------------------*/
1049 pic14_findFreeReg(short type)
1056 if((dReg = regFindFree(dynAllocRegs)) != NULL)
1058 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
1062 if((dReg = regFindFree(dynStackRegs)) != NULL)
1074 /*-----------------------------------------------------------------*/
1075 /* freeReg - frees a register */
1076 /*-----------------------------------------------------------------*/
1078 freeReg (regs * reg)
1080 debugLog ("%s\n", __FUNCTION__);
1085 /*-----------------------------------------------------------------*/
1086 /* nFreeRegs - returns number of free registers */
1087 /*-----------------------------------------------------------------*/
1089 nFreeRegs (int type)
1091 /* dynamically allocate as many as we need and worry about
1092 * fitting them into a PIC later */
1099 debugLog ("%s\n", __FUNCTION__);
1100 for (i = 0; i < pic14_nRegs; i++)
1101 if (regspic14[i].isFree && regspic14[i].type == type)
1107 /*-----------------------------------------------------------------*/
1108 /* nfreeRegsType - free registers with type */
1109 /*-----------------------------------------------------------------*/
1111 nfreeRegsType (int type)
1114 debugLog ("%s\n", __FUNCTION__);
1115 if (type == REG_PTR)
1117 if ((nfr = nFreeRegs (type)) == 0)
1118 return nFreeRegs (REG_GPR);
1121 return nFreeRegs (type);
1124 void writeSetUsedRegs(FILE *of, set *dRegs)
1129 for (dReg = setFirstItem(dRegs) ; dReg ;
1130 dReg = setNextItem(dRegs)) {
1133 fprintf (of, "\t%s\n",dReg->name);
1137 extern void assignFixedRegisters(set *regset);
1138 extern void assignRelocatableRegisters(set *regset,int used);
1139 extern void dump_map(void);
1140 extern void dump_sfr(FILE *of);
1142 void packBits(set *bregs)
1146 regs *bitfield=NULL;
1147 regs *relocbitfield=NULL;
1153 for (regset = bregs ; regset ;
1154 regset = regset->next) {
1156 breg = regset->item;
1157 breg->isBitField = 1;
1158 //fprintf(stderr,"bit reg: %s\n",breg->name);
1161 //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
1163 bitfield = typeRegWithIdx (breg->address >> 3, -1 , 1);
1164 breg->rIdx = breg->address & 7;
1165 breg->address >>= 3;
1168 //sprintf (buffer, "fbitfield%02x", breg->address);
1169 sprintf (buffer, "0x%02x", breg->address);
1170 //fprintf(stderr,"new bit field\n");
1171 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0);
1172 bitfield->isBitField = 1;
1173 bitfield->isFixed = 1;
1174 bitfield->address = breg->address;
1175 //addSet(&dynDirectRegs,bitfield);
1176 addSet(&dynInternalRegs,bitfield);
1177 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
1179 //fprintf(stderr," which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
1182 breg->reg_alias = bitfield;
1186 if(!relocbitfield || bit_no >7) {
1189 sprintf (buffer, "bitfield%d", byte_no);
1190 //fprintf(stderr,"new relocatable bit field\n");
1191 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0);
1192 relocbitfield->isBitField = 1;
1193 //addSet(&dynDirectRegs,relocbitfield);
1194 addSet(&dynInternalRegs,relocbitfield);
1195 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1199 breg->reg_alias = relocbitfield;
1200 breg->address = rDirectIdx; /* byte_no; */
1201 breg->rIdx = bit_no++;
1209 void bitEQUs(FILE *of, set *bregs)
1211 regs *breg,*bytereg;
1214 //fprintf(stderr," %s\n",__FUNCTION__);
1215 for (breg = setFirstItem(bregs) ; breg ;
1216 breg = setNextItem(bregs)) {
1218 //fprintf(stderr,"bit reg: %s\n",breg->name);
1220 bytereg = breg->reg_alias;
1222 fprintf (of, "%s\tEQU\t( (%s<<3)+%d)\n",
1225 breg->rIdx & 0x0007);
1228 //fprintf(stderr, "bit field is not assigned to a register\n");
1229 fprintf (of, "%s\tEQU\t( (bitfield%d<<3)+%d)\n",
1239 void aliasEQUs(FILE *of, set *fregs, int use_rIdx)
1244 for (reg = setFirstItem(fregs) ; reg ;
1245 reg = setNextItem(fregs)) {
1247 //if(!reg->isEmitted && reg->wasUsed) {
1250 fprintf (of, "%s\tEQU\t0x%03x\n",
1254 fprintf (of, "%s\tEQU\t0x%03x\n",
1262 void writeUsedRegs(FILE *of)
1264 packBits(dynDirectBitRegs);
1266 assignFixedRegisters(dynInternalRegs);
1267 assignFixedRegisters(dynAllocRegs);
1268 assignFixedRegisters(dynStackRegs);
1269 assignFixedRegisters(dynDirectRegs);
1271 assignRelocatableRegisters(dynInternalRegs,0);
1272 assignRelocatableRegisters(dynAllocRegs,0);
1273 assignRelocatableRegisters(dynStackRegs,0);
1276 assignRelocatableRegisters(dynDirectRegs,0);
1277 printf("assignRelocatableRegisters(dynDirectRegs,0);\n");
1282 bitEQUs(of,dynDirectBitRegs);
1284 aliasEQUs(of,dynAllocRegs,0);
1285 aliasEQUs(of,dynDirectRegs,0);
1286 aliasEQUs(of,dynStackRegs,0);
1287 aliasEQUs(of,dynProcessorRegs,1);
1292 /*-----------------------------------------------------------------*/
1293 /* allDefsOutOfRange - all definitions are out of a range */
1294 /*-----------------------------------------------------------------*/
1296 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
1300 debugLog ("%s\n", __FUNCTION__);
1304 for (i = 0; i < defs->size; i++)
1308 if (bitVectBitValue (defs, i) &&
1309 (ic = hTabItemWithKey (iCodehTab, i)) &&
1310 (ic->seq >= fseq && ic->seq <= toseq))
1320 /*-----------------------------------------------------------------*/
1321 /* computeSpillable - given a point find the spillable live ranges */
1322 /*-----------------------------------------------------------------*/
1324 computeSpillable (iCode * ic)
1328 debugLog ("%s\n", __FUNCTION__);
1329 /* spillable live ranges are those that are live at this
1330 point . the following categories need to be subtracted
1332 a) - those that are already spilt
1333 b) - if being used by this one
1334 c) - defined by this one */
1336 spillable = bitVectCopy (ic->rlive);
1338 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1340 bitVectCplAnd (spillable, ic->uses); /* used in this one */
1341 bitVectUnSetBit (spillable, ic->defKey);
1342 spillable = bitVectIntersect (spillable, _G.regAssigned);
1347 /*-----------------------------------------------------------------*/
1348 /* noSpilLoc - return true if a variable has no spil location */
1349 /*-----------------------------------------------------------------*/
1351 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1353 debugLog ("%s\n", __FUNCTION__);
1354 return (sym->usl.spillLoc ? 0 : 1);
1357 /*-----------------------------------------------------------------*/
1358 /* hasSpilLoc - will return 1 if the symbol has spil location */
1359 /*-----------------------------------------------------------------*/
1361 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1363 debugLog ("%s\n", __FUNCTION__);
1364 return (sym->usl.spillLoc ? 1 : 0);
1367 /*-----------------------------------------------------------------*/
1368 /* directSpilLoc - will return 1 if the splilocation is in direct */
1369 /*-----------------------------------------------------------------*/
1371 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1373 debugLog ("%s\n", __FUNCTION__);
1374 if (sym->usl.spillLoc &&
1375 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1381 /*-----------------------------------------------------------------*/
1382 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1383 /* but is not used as a pointer */
1384 /*-----------------------------------------------------------------*/
1386 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1388 debugLog ("%s\n", __FUNCTION__);
1389 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1392 /*-----------------------------------------------------------------*/
1393 /* rematable - will return 1 if the remat flag is set */
1394 /*-----------------------------------------------------------------*/
1396 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1398 debugLog ("%s\n", __FUNCTION__);
1402 /*-----------------------------------------------------------------*/
1403 /* notUsedInRemaining - not used or defined in remain of the block */
1404 /*-----------------------------------------------------------------*/
1406 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1408 debugLog ("%s\n", __FUNCTION__);
1409 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1410 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1413 /*-----------------------------------------------------------------*/
1414 /* allLRs - return true for all */
1415 /*-----------------------------------------------------------------*/
1417 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1419 debugLog ("%s\n", __FUNCTION__);
1423 /*-----------------------------------------------------------------*/
1424 /* liveRangesWith - applies function to a given set of live range */
1425 /*-----------------------------------------------------------------*/
1427 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1428 eBBlock * ebp, iCode * ic)
1433 debugLog ("%s\n", __FUNCTION__);
1434 if (!lrs || !lrs->size)
1437 for (i = 1; i < lrs->size; i++)
1440 if (!bitVectBitValue (lrs, i))
1443 /* if we don't find it in the live range
1444 hash table we are in serious trouble */
1445 if (!(sym = hTabItemWithKey (liveRanges, i)))
1447 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1448 "liveRangesWith could not find liveRange");
1452 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1453 addSetHead (&rset, sym);
1460 /*-----------------------------------------------------------------*/
1461 /* leastUsedLR - given a set determines which is the least used */
1462 /*-----------------------------------------------------------------*/
1464 leastUsedLR (set * sset)
1466 symbol *sym = NULL, *lsym = NULL;
1468 debugLog ("%s\n", __FUNCTION__);
1469 sym = lsym = setFirstItem (sset);
1474 for (; lsym; lsym = setNextItem (sset))
1477 /* if usage is the same then prefer
1478 the spill the smaller of the two */
1479 if (lsym->used == sym->used)
1480 if (getSize (lsym->type) < getSize (sym->type))
1484 if (lsym->used < sym->used)
1489 setToNull ((void *) &sset);
1494 /*-----------------------------------------------------------------*/
1495 /* noOverLap - will iterate through the list looking for over lap */
1496 /*-----------------------------------------------------------------*/
1498 noOverLap (set * itmpStack, symbol * fsym)
1501 debugLog ("%s\n", __FUNCTION__);
1504 for (sym = setFirstItem (itmpStack); sym;
1505 sym = setNextItem (itmpStack))
1507 if (sym->liveTo > fsym->liveFrom)
1515 /*-----------------------------------------------------------------*/
1516 /* isFree - will return 1 if the a free spil location is found */
1517 /*-----------------------------------------------------------------*/
1522 V_ARG (symbol **, sloc);
1523 V_ARG (symbol *, fsym);
1525 debugLog ("%s\n", __FUNCTION__);
1526 /* if already found */
1530 /* if it is free && and the itmp assigned to
1531 this does not have any overlapping live ranges
1532 with the one currently being assigned and
1533 the size can be accomodated */
1535 noOverLap (sym->usl.itmpStack, fsym) &&
1536 getSize (sym->type) >= getSize (fsym->type))
1545 /*-----------------------------------------------------------------*/
1546 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
1547 /*-----------------------------------------------------------------*/
1549 spillLRWithPtrReg (symbol * forSym)
1555 debugLog ("%s\n", __FUNCTION__);
1556 if (!_G.regAssigned ||
1557 bitVectIsZero (_G.regAssigned))
1560 r0 = pic14_regWithIdx (R0_IDX);
1561 r1 = pic14_regWithIdx (R1_IDX);
1563 /* for all live ranges */
1564 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1565 lrsym = hTabNextItem (liveRanges, &k))
1569 /* if no registers assigned to it or
1571 /* if it does not overlap with this then
1572 not need to spill it */
1574 if (lrsym->isspilt || !lrsym->nRegs ||
1575 (lrsym->liveTo < forSym->liveFrom))
1578 /* go thru the registers : if it is either
1579 r0 or r1 then spil it */
1580 for (j = 0; j < lrsym->nRegs; j++)
1581 if (lrsym->regs[j] == r0 ||
1582 lrsym->regs[j] == r1)
1591 /*-----------------------------------------------------------------*/
1592 /* createStackSpil - create a location on the stack to spil */
1593 /*-----------------------------------------------------------------*/
1595 createStackSpil (symbol * sym)
1597 symbol *sloc = NULL;
1598 int useXstack, model, noOverlay;
1600 char slocBuffer[30];
1601 debugLog ("%s\n", __FUNCTION__);
1603 /* first go try and find a free one that is already
1604 existing on the stack */
1605 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1607 /* found a free one : just update & return */
1608 sym->usl.spillLoc = sloc;
1611 addSetHead (&sloc->usl.itmpStack, sym);
1615 /* could not then have to create one , this is the hard part
1616 we need to allocate this on the stack : this is really a
1617 hack!! but cannot think of anything better at this time */
1619 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1621 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1622 __FILE__, __LINE__);
1626 sloc = newiTemp (slocBuffer);
1628 /* set the type to the spilling symbol */
1629 sloc->type = copyLinkChain (sym->type);
1630 sloc->etype = getSpec (sloc->type);
1631 SPEC_SCLS (sloc->etype) = S_DATA;
1632 SPEC_EXTR (sloc->etype) = 0;
1633 SPEC_STAT (sloc->etype) = 0;
1635 /* we don't allow it to be allocated`
1636 onto the external stack since : so we
1637 temporarily turn it off ; we also
1638 turn off memory model to prevent
1639 the spil from going to the external storage
1640 and turn off overlaying
1643 useXstack = options.useXstack;
1644 model = options.model;
1645 noOverlay = options.noOverlay;
1646 options.noOverlay = 1;
1647 options.model = options.useXstack = 0;
1651 options.useXstack = useXstack;
1652 options.model = model;
1653 options.noOverlay = noOverlay;
1654 sloc->isref = 1; /* to prevent compiler warning */
1656 /* if it is on the stack then update the stack */
1657 if (IN_STACK (sloc->etype))
1659 currFunc->stack += getSize (sloc->type);
1660 _G.stackExtend += getSize (sloc->type);
1663 _G.dataExtend += getSize (sloc->type);
1665 /* add it to the _G.stackSpil set */
1666 addSetHead (&_G.stackSpil, sloc);
1667 sym->usl.spillLoc = sloc;
1670 /* add it to the set of itempStack set
1671 of the spill location */
1672 addSetHead (&sloc->usl.itmpStack, sym);
1676 /*-----------------------------------------------------------------*/
1677 /* isSpiltOnStack - returns true if the spil location is on stack */
1678 /*-----------------------------------------------------------------*/
1680 isSpiltOnStack (symbol * sym)
1684 debugLog ("%s\n", __FUNCTION__);
1691 /* if (sym->_G.stackSpil) */
1694 if (!sym->usl.spillLoc)
1697 etype = getSpec (sym->usl.spillLoc->type);
1698 if (IN_STACK (etype))
1704 /*-----------------------------------------------------------------*/
1705 /* spillThis - spils a specific operand */
1706 /*-----------------------------------------------------------------*/
1708 spillThis (symbol * sym)
1711 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1713 /* if this is rematerializable or has a spillLocation
1714 we are okay, else we need to create a spillLocation
1716 if (!(sym->remat || sym->usl.spillLoc))
1717 createStackSpil (sym);
1720 /* mark it has spilt & put it in the spilt set */
1722 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1724 bitVectUnSetBit (_G.regAssigned, sym->key);
1726 for (i = 0; i < sym->nRegs; i++)
1730 freeReg (sym->regs[i]);
1731 sym->regs[i] = NULL;
1734 /* if spilt on stack then free up r0 & r1
1735 if they could have been assigned to some
1737 if (!pic14_ptrRegReq && isSpiltOnStack (sym))
1740 spillLRWithPtrReg (sym);
1743 if (sym->usl.spillLoc && !sym->remat)
1744 sym->usl.spillLoc->allocreq = 1;
1748 /*-----------------------------------------------------------------*/
1749 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1750 /*-----------------------------------------------------------------*/
1752 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1754 bitVect *lrcs = NULL;
1758 debugLog ("%s\n", __FUNCTION__);
1759 /* get the spillable live ranges */
1760 lrcs = computeSpillable (ic);
1762 /* get all live ranges that are rematerizable */
1763 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1766 /* return the least used of these */
1767 return leastUsedLR (selectS);
1770 /* get live ranges with spillLocations in direct space */
1771 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1773 sym = leastUsedLR (selectS);
1774 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1775 sym->usl.spillLoc->rname :
1776 sym->usl.spillLoc->name));
1778 /* mark it as allocation required */
1779 sym->usl.spillLoc->allocreq = 1;
1783 /* if the symbol is local to the block then */
1784 if (forSym->liveTo < ebp->lSeq)
1787 /* check if there are any live ranges allocated
1788 to registers that are not used in this block */
1789 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1791 sym = leastUsedLR (selectS);
1792 /* if this is not rematerializable */
1801 /* check if there are any live ranges that not
1802 used in the remainder of the block */
1803 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1805 sym = leastUsedLR (selectS);
1808 sym->remainSpil = 1;
1815 /* find live ranges with spillocation && not used as pointers */
1816 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1819 sym = leastUsedLR (selectS);
1820 /* mark this as allocation required */
1821 sym->usl.spillLoc->allocreq = 1;
1825 /* find live ranges with spillocation */
1826 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1829 sym = leastUsedLR (selectS);
1830 sym->usl.spillLoc->allocreq = 1;
1834 /* couldn't find then we need to create a spil
1835 location on the stack , for which one? the least
1837 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1840 /* return a created spil location */
1841 sym = createStackSpil (leastUsedLR (selectS));
1842 sym->usl.spillLoc->allocreq = 1;
1846 /* this is an extreme situation we will spill
1847 this one : happens very rarely but it does happen */
1853 /*-----------------------------------------------------------------*/
1854 /* spilSomething - spil some variable & mark registers as free */
1855 /*-----------------------------------------------------------------*/
1857 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1862 debugLog ("%s\n", __FUNCTION__);
1863 /* get something we can spil */
1864 ssym = selectSpil (ic, ebp, forSym);
1866 /* mark it as spilt */
1868 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1870 /* mark it as not register assigned &
1871 take it away from the set */
1872 bitVectUnSetBit (_G.regAssigned, ssym->key);
1874 /* mark the registers as free */
1875 for (i = 0; i < ssym->nRegs; i++)
1877 freeReg (ssym->regs[i]);
1879 /* if spilt on stack then free up r0 & r1
1880 if they could have been assigned to as gprs */
1881 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1884 spillLRWithPtrReg (ssym);
1887 /* if this was a block level spil then insert push & pop
1888 at the start & end of block respectively */
1889 if (ssym->blockSpil)
1891 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1892 /* add push to the start of the block */
1893 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1894 ebp->sch->next : ebp->sch));
1895 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1896 /* add pop to the end of the block */
1897 addiCodeToeBBlock (ebp, nic, NULL);
1900 /* if spilt because not used in the remainder of the
1901 block then add a push before this instruction and
1902 a pop at the end of the block */
1903 if (ssym->remainSpil)
1906 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1907 /* add push just before this instruction */
1908 addiCodeToeBBlock (ebp, nic, ic);
1910 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1911 /* add pop to the end of the block */
1912 addiCodeToeBBlock (ebp, nic, NULL);
1921 /*-----------------------------------------------------------------*/
1922 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1923 /*-----------------------------------------------------------------*/
1925 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1929 debugLog ("%s\n", __FUNCTION__);
1931 /* try for a ptr type */
1932 if ((reg = allocReg (REG_PTR)))
1935 /* try for gpr type */
1936 if ((reg = allocReg (REG_GPR)))
1939 /* we have to spil */
1940 if (!spilSomething (ic, ebp, sym))
1943 /* this looks like an infinite loop but
1944 in really selectSpil will abort */
1948 /*-----------------------------------------------------------------*/
1949 /* getRegGpr - will try for GPR if not spil */
1950 /*-----------------------------------------------------------------*/
1952 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1956 debugLog ("%s\n", __FUNCTION__);
1958 /* try for gpr type */
1959 if ((reg = allocReg (REG_GPR)))
1962 if (!pic14_ptrRegReq)
1963 if ((reg = allocReg (REG_PTR)))
1966 /* we have to spil */
1967 if (!spilSomething (ic, ebp, sym))
1970 /* this looks like an infinite loop but
1971 in really selectSpil will abort */
1975 /*-----------------------------------------------------------------*/
1976 /* symHasReg - symbol has a given register */
1977 /*-----------------------------------------------------------------*/
1979 symHasReg (symbol * sym, regs * reg)
1983 debugLog ("%s\n", __FUNCTION__);
1984 for (i = 0; i < sym->nRegs; i++)
1985 if (sym->regs[i] == reg)
1991 /*-----------------------------------------------------------------*/
1992 /* deassignLRs - check the live to and if they have registers & are */
1993 /* not spilt then free up the registers */
1994 /*-----------------------------------------------------------------*/
1996 deassignLRs (iCode * ic, eBBlock * ebp)
2002 debugLog ("%s\n", __FUNCTION__);
2003 for (sym = hTabFirstItem (liveRanges, &k); sym;
2004 sym = hTabNextItem (liveRanges, &k))
2007 symbol *psym = NULL;
2008 /* if it does not end here */
2009 if (sym->liveTo > ic->seq)
2012 /* if it was spilt on stack then we can
2013 mark the stack spil location as free */
2018 sym->usl.spillLoc->isFree = 1;
2024 if (!bitVectBitValue (_G.regAssigned, sym->key))
2027 /* special case check if this is an IFX &
2028 the privious one was a pop and the
2029 previous one was not spilt then keep track
2031 if (ic->op == IFX && ic->prev &&
2032 ic->prev->op == IPOP &&
2033 !ic->prev->parmPush &&
2034 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
2035 psym = OP_SYMBOL (IC_LEFT (ic->prev));
2041 bitVectUnSetBit (_G.regAssigned, sym->key);
2043 /* if the result of this one needs registers
2044 and does not have it then assign it right
2046 if (IC_RESULT (ic) &&
2047 !(SKIP_IC2 (ic) || /* not a special icode */
2048 ic->op == JUMPTABLE ||
2053 POINTER_SET (ic)) &&
2054 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
2055 result->liveTo > ic->seq && /* and will live beyond this */
2056 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
2057 result->regType == sym->regType && /* same register types */
2058 result->nRegs && /* which needs registers */
2059 !result->isspilt && /* and does not already have them */
2061 !bitVectBitValue (_G.regAssigned, result->key) &&
2062 /* the number of free regs + number of regs in this LR
2063 can accomodate the what result Needs */
2064 ((nfreeRegsType (result->regType) +
2065 sym->nRegs) >= result->nRegs)
2069 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2071 result->regs[i] = sym->regs[i];
2073 result->regs[i] = getRegGpr (ic, ebp, result);
2075 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2079 /* free the remaining */
2080 for (; i < sym->nRegs; i++)
2084 if (!symHasReg (psym, sym->regs[i]))
2085 freeReg (sym->regs[i]);
2088 freeReg (sym->regs[i]);
2095 /*-----------------------------------------------------------------*/
2096 /* reassignLR - reassign this to registers */
2097 /*-----------------------------------------------------------------*/
2099 reassignLR (operand * op)
2101 symbol *sym = OP_SYMBOL (op);
2104 debugLog ("%s\n", __FUNCTION__);
2105 /* not spilt any more */
2106 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2107 bitVectUnSetBit (_G.spiltSet, sym->key);
2109 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2113 for (i = 0; i < sym->nRegs; i++)
2114 sym->regs[i]->isFree = 0;
2117 /*-----------------------------------------------------------------*/
2118 /* willCauseSpill - determines if allocating will cause a spill */
2119 /*-----------------------------------------------------------------*/
2121 willCauseSpill (int nr, int rt)
2123 debugLog ("%s\n", __FUNCTION__);
2124 /* first check if there are any avlb registers
2125 of te type required */
2128 /* special case for pointer type
2129 if pointer type not avlb then
2130 check for type gpr */
2131 if (nFreeRegs (rt) >= nr)
2133 if (nFreeRegs (REG_GPR) >= nr)
2138 if (pic14_ptrRegReq)
2140 if (nFreeRegs (rt) >= nr)
2145 if (nFreeRegs (REG_PTR) +
2146 nFreeRegs (REG_GPR) >= nr)
2151 debugLog (" ... yep it will (cause a spill)\n");
2152 /* it will cause a spil */
2156 /*-----------------------------------------------------------------*/
2157 /* positionRegs - the allocator can allocate same registers to res- */
2158 /* ult and operand, if this happens make sure they are in the same */
2159 /* position as the operand otherwise chaos results */
2160 /*-----------------------------------------------------------------*/
2162 positionRegs (symbol * result, symbol * opsym, int lineno)
2164 int count = min (result->nRegs, opsym->nRegs);
2165 int i, j = 0, shared = 0;
2167 debugLog ("%s\n", __FUNCTION__);
2168 /* if the result has been spilt then cannot share */
2173 /* first make sure that they actually share */
2174 for (i = 0; i < count; i++)
2176 for (j = 0; j < count; j++)
2178 if (result->regs[i] == opsym->regs[j] && i != j)
2188 regs *tmp = result->regs[i];
2189 result->regs[i] = result->regs[j];
2190 result->regs[j] = tmp;
2195 /*-----------------------------------------------------------------*/
2196 /* serialRegAssign - serially allocate registers to the variables */
2197 /*-----------------------------------------------------------------*/
2199 serialRegAssign (eBBlock ** ebbs, int count)
2203 debugLog ("%s\n", __FUNCTION__);
2204 /* for all blocks */
2205 for (i = 0; i < count; i++)
2210 if (ebbs[i]->noPath &&
2211 (ebbs[i]->entryLabel != entryLabel &&
2212 ebbs[i]->entryLabel != returnLabel))
2215 /* of all instructions do */
2216 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2219 debugLog (" op: %s\n", decodeOp (ic->op));
2221 /* if this is an ipop that means some live
2222 range will have to be assigned again */
2224 reassignLR (IC_LEFT (ic));
2226 /* if result is present && is a true symbol */
2227 if (IC_RESULT (ic) && ic->op != IFX &&
2228 IS_TRUE_SYMOP (IC_RESULT (ic)))
2229 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2231 /* take away registers from live
2232 ranges that end at this instruction */
2233 deassignLRs (ic, ebbs[i]);
2235 /* some don't need registers */
2236 if (SKIP_IC2 (ic) ||
2237 ic->op == JUMPTABLE ||
2241 (IC_RESULT (ic) && POINTER_SET (ic)))
2244 /* now we need to allocate registers
2245 only for the result */
2248 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2254 /* if it does not need or is spilt
2255 or is already assigned to registers
2256 or will not live beyond this instructions */
2259 bitVectBitValue (_G.regAssigned, sym->key) ||
2260 sym->liveTo <= ic->seq)
2263 /* if some liverange has been spilt at the block level
2264 and this one live beyond this block then spil this
2266 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2271 /* if trying to allocate this will cause
2272 a spill and there is nothing to spill
2273 or this one is rematerializable then
2275 willCS = willCauseSpill (sym->nRegs, sym->regType);
2276 spillable = computeSpillable (ic);
2278 (willCS && bitVectIsZero (spillable)))
2286 /* if it has a spillocation & is used less than
2287 all other live ranges then spill this */
2289 if (sym->usl.spillLoc) {
2290 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2291 allLRs, ebbs[i], ic));
2292 if (leastUsed && leastUsed->used > sym->used) {
2297 /* if none of the liveRanges have a spillLocation then better
2298 to spill this one than anything else already assigned to registers */
2299 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2300 /* if this is local to this block then we might find a block spil */
2301 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2309 if (ic->op == RECEIVE)
2310 debugLog ("When I get clever, I'll optimize the receive logic\n");
2312 /* if we need ptr regs for the right side
2314 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2315 <= (unsigned) PTRSIZE)
2320 /* else we assign registers to it */
2321 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2323 debugLog (" %d - \n", __LINE__);
2325 bitVectDebugOn(_G.regAssigned, debugF);
2326 for (j = 0; j < sym->nRegs; j++)
2328 if (sym->regType == REG_PTR)
2329 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2331 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2333 /* if the allocation failed which means
2334 this was spilt then break */
2338 debugLog (" %d - \n", __LINE__);
2340 /* if it shares registers with operands make sure
2341 that they are in the same position */
2342 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2343 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2344 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2345 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2346 /* do the same for the right operand */
2347 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2348 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2349 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2350 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2352 debugLog (" %d - \n", __LINE__);
2355 debugLog (" %d - \n", __LINE__);
2365 /*-----------------------------------------------------------------*/
2366 /* rUmaskForOp :- returns register mask for an operand */
2367 /*-----------------------------------------------------------------*/
2369 rUmaskForOp (operand * op)
2375 debugLog ("%s\n", __FUNCTION__);
2376 /* only temporaries are assigned registers */
2380 sym = OP_SYMBOL (op);
2382 /* if spilt or no registers assigned to it
2384 if (sym->isspilt || !sym->nRegs)
2387 rumask = newBitVect (pic14_nRegs);
2389 for (j = 0; j < sym->nRegs; j++)
2391 rumask = bitVectSetBit (rumask,
2392 sym->regs[j]->rIdx);
2398 /*-----------------------------------------------------------------*/
2399 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2400 /*-----------------------------------------------------------------*/
2402 regsUsedIniCode (iCode * ic)
2404 bitVect *rmask = newBitVect (pic14_nRegs);
2406 debugLog ("%s\n", __FUNCTION__);
2407 /* do the special cases first */
2410 rmask = bitVectUnion (rmask,
2411 rUmaskForOp (IC_COND (ic)));
2415 /* for the jumptable */
2416 if (ic->op == JUMPTABLE)
2418 rmask = bitVectUnion (rmask,
2419 rUmaskForOp (IC_JTCOND (ic)));
2424 /* of all other cases */
2426 rmask = bitVectUnion (rmask,
2427 rUmaskForOp (IC_LEFT (ic)));
2431 rmask = bitVectUnion (rmask,
2432 rUmaskForOp (IC_RIGHT (ic)));
2435 rmask = bitVectUnion (rmask,
2436 rUmaskForOp (IC_RESULT (ic)));
2442 /*-----------------------------------------------------------------*/
2443 /* createRegMask - for each instruction will determine the regsUsed */
2444 /*-----------------------------------------------------------------*/
2446 createRegMask (eBBlock ** ebbs, int count)
2450 debugLog ("%s\n", __FUNCTION__);
2451 /* for all blocks */
2452 for (i = 0; i < count; i++)
2456 if (ebbs[i]->noPath &&
2457 (ebbs[i]->entryLabel != entryLabel &&
2458 ebbs[i]->entryLabel != returnLabel))
2461 /* for all instructions */
2462 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2467 if (SKIP_IC2 (ic) || !ic->rlive)
2470 /* first mark the registers used in this
2472 ic->rUsed = regsUsedIniCode (ic);
2473 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2475 /* now create the register mask for those
2476 registers that are in use : this is a
2477 super set of ic->rUsed */
2478 ic->rMask = newBitVect (pic14_nRegs + 1);
2480 /* for all live Ranges alive at this point */
2481 for (j = 1; j < ic->rlive->size; j++)
2486 /* if not alive then continue */
2487 if (!bitVectBitValue (ic->rlive, j))
2490 /* find the live range we are interested in */
2491 if (!(sym = hTabItemWithKey (liveRanges, j)))
2493 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2494 "createRegMask cannot find live range");
2498 /* if no register assigned to it */
2499 if (!sym->nRegs || sym->isspilt)
2502 /* for all the registers allocated to it */
2503 for (k = 0; k < sym->nRegs; k++)
2506 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2512 /*-----------------------------------------------------------------*/
2513 /* rematStr - returns the rematerialized string for a remat var */
2514 /*-----------------------------------------------------------------*/
2516 rematStr (symbol * sym)
2519 iCode *ic = sym->rematiCode;
2520 symbol *psym = NULL;
2522 debugLog ("%s\n", __FUNCTION__);
2524 //printf ("%s\n", s);
2526 /* if plus or minus print the right hand side */
2528 if (ic->op == '+' || ic->op == '-') {
2530 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2532 sprintf (s, "(%s %c 0x%04x)",
2533 OP_SYMBOL (IC_LEFT (ric))->rname,
2535 (int) operandLitValue (IC_RIGHT (ic)));
2538 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2540 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2541 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2546 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2547 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2549 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2554 /*-----------------------------------------------------------------*/
2555 /* rematStr - returns the rematerialized string for a remat var */
2556 /*-----------------------------------------------------------------*/
2558 rematStr (symbol * sym)
2561 iCode *ic = sym->rematiCode;
2563 debugLog ("%s\n", __FUNCTION__);
2568 /* if plus or minus print the right hand side */
2570 if (ic->op == '+' || ic->op == '-') {
2571 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2574 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2578 if (ic->op == '+' || ic->op == '-')
2580 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2581 sprintf (s, "(%s %c 0x%04x)",
2582 OP_SYMBOL (IC_LEFT (ric))->rname,
2584 (int) operandLitValue (IC_RIGHT (ic)));
2587 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2589 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2593 /* we reached the end */
2594 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2598 printf ("%s\n", buffer);
2603 /*-----------------------------------------------------------------*/
2604 /* regTypeNum - computes the type & number of registers required */
2605 /*-----------------------------------------------------------------*/
2613 debugLog ("%s\n", __FUNCTION__);
2614 /* for each live range do */
2615 for (sym = hTabFirstItem (liveRanges, &k); sym;
2616 sym = hTabNextItem (liveRanges, &k)) {
2618 debugLog (" %d - %s\n", __LINE__, sym->rname);
2620 /* if used zero times then no registers needed */
2621 if ((sym->liveTo - sym->liveFrom) == 0)
2625 /* if the live range is a temporary */
2628 debugLog (" %d - itemp register\n", __LINE__);
2630 /* if the type is marked as a conditional */
2631 if (sym->regType == REG_CND)
2634 /* if used in return only then we don't
2637 if (IS_AGGREGATE (sym->type) || sym->isptr)
2638 sym->type = aggrToPtr (sym->type, FALSE);
2639 debugLog (" %d - no reg needed - accumulator used\n", __LINE__);
2645 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2646 // sym->type = aggrToPtr (sym->type, FALSE);
2647 debugLog (" %d - used as a return\n", __LINE__);
2652 /* if the symbol has only one definition &
2653 that definition is a get_pointer and the
2654 pointer we are getting is rematerializable and
2657 if (bitVectnBitsOn (sym->defs) == 1 &&
2658 (ic = hTabItemWithKey (iCodehTab,
2659 bitVectFirstBit (sym->defs))) &&
2662 !IS_BITVAR (sym->etype)) {
2665 debugLog (" %d - \n", __LINE__);
2667 /* if remat in data space */
2668 if (OP_SYMBOL (IC_LEFT (ic))->remat &&
2669 DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER) {
2671 /* create a psuedo symbol & force a spil */
2672 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2673 symbol *psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2674 psym->type = sym->type;
2675 psym->etype = sym->etype;
2676 strcpy (psym->rname, psym->name);
2678 sym->usl.spillLoc = psym;
2682 /* if in data space or idata space then try to
2683 allocate pointer register */
2687 /* if not then we require registers */
2688 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2689 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2690 getSize (sym->type));
2693 if(IS_PTR_CONST (sym->type)) {
2694 debugLog (" %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2698 if (sym->nRegs > 4) {
2699 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2700 printTypeChain (sym->type, stderr);
2701 fprintf (stderr, "\n");
2704 /* determine the type of register required */
2705 if (sym->nRegs == 1 &&
2706 IS_PTR (sym->type) &&
2708 sym->regType = REG_PTR;
2710 sym->regType = REG_GPR;
2713 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2717 /* for the first run we don't provide */
2718 /* registers for true symbols we will */
2719 /* see how things go */
2724 DEFSETFUNC (markRegFree)
2726 ((regs *)item)->isFree = 1;
2731 DEFSETFUNC (deallocReg)
2733 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2734 ((regs *)item)->isFree = 1;
2735 ((regs *)item)->wasUsed = 0;
2739 /*-----------------------------------------------------------------*/
2740 /* freeAllRegs - mark all registers as free */
2741 /*-----------------------------------------------------------------*/
2743 pic14_freeAllRegs ()
2747 debugLog ("%s\n", __FUNCTION__);
2749 applyToSet(dynAllocRegs,markRegFree);
2750 applyToSet(dynStackRegs,markRegFree);
2753 for (i = 0; i < pic14_nRegs; i++)
2754 regspic14[i].isFree = 1;
2758 /*-----------------------------------------------------------------*/
2759 /*-----------------------------------------------------------------*/
2761 pic14_deallocateAllRegs ()
2765 debugLog ("%s\n", __FUNCTION__);
2767 applyToSet(dynAllocRegs,deallocReg);
2770 for (i = 0; i < pic14_nRegs; i++) {
2771 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2772 regspic14[i].isFree = 1;
2773 regspic14[i].wasUsed = 0;
2780 /*-----------------------------------------------------------------*/
2781 /* deallocStackSpil - this will set the stack pointer back */
2782 /*-----------------------------------------------------------------*/
2784 DEFSETFUNC (deallocStackSpil)
2788 debugLog ("%s\n", __FUNCTION__);
2793 /*-----------------------------------------------------------------*/
2794 /* farSpacePackable - returns the packable icode for far variables */
2795 /*-----------------------------------------------------------------*/
2797 farSpacePackable (iCode * ic)
2801 debugLog ("%s\n", __FUNCTION__);
2802 /* go thru till we find a definition for the
2803 symbol on the right */
2804 for (dic = ic->prev; dic; dic = dic->prev)
2807 /* if the definition is a call then no */
2808 if ((dic->op == CALL || dic->op == PCALL) &&
2809 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2814 /* if shift by unknown amount then not */
2815 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2816 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2819 /* if pointer get and size > 1 */
2820 if (POINTER_GET (dic) &&
2821 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2824 if (POINTER_SET (dic) &&
2825 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2828 /* if any three is a true symbol in far space */
2829 if (IC_RESULT (dic) &&
2830 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2831 isOperandInFarSpace (IC_RESULT (dic)))
2834 if (IC_RIGHT (dic) &&
2835 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2836 isOperandInFarSpace (IC_RIGHT (dic)) &&
2837 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2840 if (IC_LEFT (dic) &&
2841 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2842 isOperandInFarSpace (IC_LEFT (dic)) &&
2843 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2846 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2848 if ((dic->op == LEFT_OP ||
2849 dic->op == RIGHT_OP ||
2851 IS_OP_LITERAL (IC_RIGHT (dic)))
2861 /*-----------------------------------------------------------------*/
2862 /* packRegsForAssign - register reduction for assignment */
2863 /*-----------------------------------------------------------------*/
2865 packRegsForAssign (iCode * ic, eBBlock * ebp)
2870 debugLog ("%s\n", __FUNCTION__);
2872 debugAopGet (" result:", IC_RESULT (ic));
2873 debugAopGet (" left:", IC_LEFT (ic));
2874 debugAopGet (" right:", IC_RIGHT (ic));
2876 /* if this is at an absolute address, then get the address. */
2877 if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2878 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2879 debugLog (" %d - found config word declaration\n", __LINE__);
2880 if(IS_VALOP(IC_RIGHT(ic))) {
2881 debugLog (" setting config word to %x\n",
2882 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2883 assignConfigWordValue( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2884 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2887 /* remove the assignment from the iCode chain. */
2889 remiCodeFromeBBlock (ebp, ic);
2890 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2891 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2898 if (!IS_ITEMP (IC_RESULT (ic))) {
2899 allocDirReg(IC_RESULT (ic));
2900 debugLog (" %d - result is not temp\n", __LINE__);
2903 if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2904 debugLog (" %d - left is not temp, allocating\n", __LINE__);
2905 allocDirReg(IC_LEFT (ic));
2909 if (!IS_ITEMP (IC_RIGHT (ic))) {
2910 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2912 /* only pack if this is not a function pointer */
2913 if (!IS_REF (IC_RIGHT (ic)))
2914 allocDirReg(IC_RIGHT (ic));
2918 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2919 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2921 debugLog (" %d - not packing - right side fails \n", __LINE__);
2925 /* if the true symbol is defined in far space or on stack
2926 then we should not since this will increase register pressure */
2927 if (isOperandInFarSpace (IC_RESULT (ic)))
2929 if ((dic = farSpacePackable (ic)))
2935 /* find the definition of iTempNN scanning backwards if we find a
2936 a use of the true symbol before we find the definition then
2938 for (dic = ic->prev; dic; dic = dic->prev)
2941 /* if there is a function call and this is
2942 a parameter & not my parameter then don't pack it */
2943 if ((dic->op == CALL || dic->op == PCALL) &&
2944 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2945 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2947 debugLog (" %d - \n", __LINE__);
2955 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2956 IS_OP_VOLATILE (IC_RESULT (dic)))
2958 debugLog (" %d - dic is VOLATILE \n", __LINE__);
2963 if (IS_SYMOP (IC_RESULT (dic)) &&
2964 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2966 /* A previous result was assigned to the same register - we'll our definition */
2967 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
2968 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
2969 if (POINTER_SET (dic))
2975 if (IS_SYMOP (IC_RIGHT (dic)) &&
2976 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
2977 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2979 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
2984 if (IS_SYMOP (IC_LEFT (dic)) &&
2985 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2986 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2988 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
2993 if (POINTER_SET (dic) &&
2994 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
2996 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
3004 return 0; /* did not find */
3006 /* if the result is on stack or iaccess then it must be
3007 the same atleast one of the operands */
3008 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3009 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3012 /* the operation has only one symbol
3013 operator then we can pack */
3014 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3015 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3018 if (!((IC_LEFT (dic) &&
3019 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3021 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3025 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3026 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3027 /* found the definition */
3028 /* replace the result with the result of */
3029 /* this assignment and remove this assignment */
3030 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3031 IC_RESULT (dic) = IC_RESULT (ic);
3033 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3035 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3037 /* delete from liverange table also
3038 delete from all the points inbetween and the new
3040 for (sic = dic; sic != ic; sic = sic->next)
3042 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3043 if (IS_ITEMP (IC_RESULT (dic)))
3044 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3047 remiCodeFromeBBlock (ebp, ic);
3048 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3049 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3050 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3056 /*-----------------------------------------------------------------*/
3057 /* findAssignToSym : scanning backwards looks for first assig found */
3058 /*-----------------------------------------------------------------*/
3060 findAssignToSym (operand * op, iCode * ic)
3064 debugLog ("%s\n", __FUNCTION__);
3065 for (dic = ic->prev; dic; dic = dic->prev)
3068 /* if definition by assignment */
3069 if (dic->op == '=' &&
3070 !POINTER_SET (dic) &&
3071 IC_RESULT (dic)->key == op->key
3072 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3076 /* we are interested only if defined in far space */
3077 /* or in stack space in case of + & - */
3079 /* if assigned to a non-symbol then return
3081 if (!IS_SYMOP (IC_RIGHT (dic)))
3084 /* if the symbol is in far space then
3086 if (isOperandInFarSpace (IC_RIGHT (dic)))
3089 /* for + & - operations make sure that
3090 if it is on the stack it is the same
3091 as one of the three operands */
3092 if ((ic->op == '+' || ic->op == '-') &&
3093 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3096 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3097 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3098 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3106 /* if we find an usage then we cannot delete it */
3107 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3110 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3113 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3117 /* now make sure that the right side of dic
3118 is not defined between ic & dic */
3121 iCode *sic = dic->next;
3123 for (; sic != ic; sic = sic->next)
3124 if (IC_RESULT (sic) &&
3125 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3134 /*-----------------------------------------------------------------*/
3135 /* packRegsForSupport :- reduce some registers for support calls */
3136 /*-----------------------------------------------------------------*/
3138 packRegsForSupport (iCode * ic, eBBlock * ebp)
3142 debugLog ("%s\n", __FUNCTION__);
3143 /* for the left & right operand :- look to see if the
3144 left was assigned a true symbol in far space in that
3145 case replace them */
3146 if (IS_ITEMP (IC_LEFT (ic)) &&
3147 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3149 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3155 debugAopGet ("removing left:", IC_LEFT (ic));
3157 /* found it we need to remove it from the
3159 for (sic = dic; sic != ic; sic = sic->next)
3160 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3162 IC_LEFT (ic)->operand.symOperand =
3163 IC_RIGHT (dic)->operand.symOperand;
3164 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3165 remiCodeFromeBBlock (ebp, dic);
3166 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3167 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3171 /* do the same for the right operand */
3174 IS_ITEMP (IC_RIGHT (ic)) &&
3175 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3177 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3183 /* if this is a subtraction & the result
3184 is a true symbol in far space then don't pack */
3185 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3187 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3188 if (IN_FARSPACE (SPEC_OCLS (etype)))
3192 debugAopGet ("removing right:", IC_RIGHT (ic));
3194 /* found it we need to remove it from the
3196 for (sic = dic; sic != ic; sic = sic->next)
3197 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3199 IC_RIGHT (ic)->operand.symOperand =
3200 IC_RIGHT (dic)->operand.symOperand;
3201 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3203 remiCodeFromeBBlock (ebp, dic);
3204 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3205 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3212 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3215 /*-----------------------------------------------------------------*/
3216 /* packRegsForOneuse : - will reduce some registers for single Use */
3217 /*-----------------------------------------------------------------*/
3219 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3224 debugLog ("%s\n", __FUNCTION__);
3225 /* if returning a literal then do nothing */
3229 /* only upto 2 bytes since we cannot predict
3230 the usage of b, & acc */
3231 if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3236 /* this routine will mark the a symbol as used in one
3237 instruction use only && if the definition is local
3238 (ie. within the basic block) && has only one definition &&
3239 that definition is either a return value from a
3240 function or does not contain any variables in
3242 uses = bitVectCopy (OP_USES (op));
3243 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3244 if (!bitVectIsZero (uses)) /* has other uses */
3247 /* if it has only one defintion */
3248 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3249 return NULL; /* has more than one definition */
3251 /* get that definition */
3253 hTabItemWithKey (iCodehTab,
3254 bitVectFirstBit (OP_DEFS (op)))))
3257 /* found the definition now check if it is local */
3258 if (dic->seq < ebp->fSeq ||
3259 dic->seq > ebp->lSeq)
3260 return NULL; /* non-local */
3262 /* now check if it is the return from
3264 if (dic->op == CALL || dic->op == PCALL)
3266 if (ic->op != SEND && ic->op != RETURN &&
3267 !POINTER_SET(ic) && !POINTER_GET(ic))
3269 OP_SYMBOL (op)->ruonly = 1;
3276 /* otherwise check that the definition does
3277 not contain any symbols in far space */
3278 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3279 isOperandInFarSpace (IC_RIGHT (dic)) ||
3280 IS_OP_RUONLY (IC_LEFT (ic)) ||
3281 IS_OP_RUONLY (IC_RIGHT (ic)))
3286 /* if pointer set then make sure the pointer
3288 if (POINTER_SET (dic) &&
3289 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3292 if (POINTER_GET (dic) &&
3293 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3298 /* also make sure the intervenening instructions
3299 don't have any thing in far space */
3300 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3303 /* if there is an intervening function call then no */
3304 if (dic->op == CALL || dic->op == PCALL)
3306 /* if pointer set then make sure the pointer
3308 if (POINTER_SET (dic) &&
3309 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3312 if (POINTER_GET (dic) &&
3313 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3316 /* if address of & the result is remat then okay */
3317 if (dic->op == ADDRESS_OF &&
3318 OP_SYMBOL (IC_RESULT (dic))->remat)
3321 /* if operand has size of three or more & this
3322 operation is a '*','/' or '%' then 'b' may
3324 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3325 getSize (operandType (op)) >= 3)
3328 /* if left or right or result is in far space */
3329 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3330 isOperandInFarSpace (IC_RIGHT (dic)) ||
3331 isOperandInFarSpace (IC_RESULT (dic)) ||
3332 IS_OP_RUONLY (IC_LEFT (dic)) ||
3333 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3334 IS_OP_RUONLY (IC_RESULT (dic)))
3340 OP_SYMBOL (op)->ruonly = 1;
3345 /*-----------------------------------------------------------------*/
3346 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3347 /*-----------------------------------------------------------------*/
3349 isBitwiseOptimizable (iCode * ic)
3351 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3352 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3354 debugLog ("%s\n", __FUNCTION__);
3355 /* bitwise operations are considered optimizable
3356 under the following conditions (Jean-Louis VERN)
3368 if (IS_LITERAL (rtype) ||
3369 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3375 /*-----------------------------------------------------------------*/
3376 /* packRegsForAccUse - pack registers for acc use */
3377 /*-----------------------------------------------------------------*/
3379 packRegsForAccUse (iCode * ic)
3383 debugLog ("%s\n", __FUNCTION__);
3385 /* if this is an aggregate, e.g. a one byte char array */
3386 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3389 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3391 /* if + or - then it has to be one byte result */
3392 if ((ic->op == '+' || ic->op == '-')
3393 && getSize (operandType (IC_RESULT (ic))) > 1)
3396 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3397 /* if shift operation make sure right side is not a literal */
3398 if (ic->op == RIGHT_OP &&
3399 (isOperandLiteral (IC_RIGHT (ic)) ||
3400 getSize (operandType (IC_RESULT (ic))) > 1))
3403 if (ic->op == LEFT_OP &&
3404 (isOperandLiteral (IC_RIGHT (ic)) ||
3405 getSize (operandType (IC_RESULT (ic))) > 1))
3408 if (IS_BITWISE_OP (ic) &&
3409 getSize (operandType (IC_RESULT (ic))) > 1)
3413 /* has only one definition */
3414 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3417 /* has only one use */
3418 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3421 /* and the usage immediately follows this iCode */
3422 if (!(uic = hTabItemWithKey (iCodehTab,
3423 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3426 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3427 if (ic->next != uic)
3430 /* if it is a conditional branch then we definitely can */
3434 if (uic->op == JUMPTABLE)
3437 /* if the usage is not is an assignment
3438 or an arithmetic / bitwise / shift operation then not */
3439 if (POINTER_SET (uic) &&
3440 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3443 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3444 if (uic->op != '=' &&
3445 !IS_ARITHMETIC_OP (uic) &&
3446 !IS_BITWISE_OP (uic) &&
3447 uic->op != LEFT_OP &&
3448 uic->op != RIGHT_OP)
3451 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3452 /* if used in ^ operation then make sure right is not a
3454 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3457 /* if shift operation make sure right side is not a literal */
3458 if (uic->op == RIGHT_OP &&
3459 (isOperandLiteral (IC_RIGHT (uic)) ||
3460 getSize (operandType (IC_RESULT (uic))) > 1))
3463 if (uic->op == LEFT_OP &&
3464 (isOperandLiteral (IC_RIGHT (uic)) ||
3465 getSize (operandType (IC_RESULT (uic))) > 1))
3468 /* make sure that the result of this icode is not on the
3469 stack, since acc is used to compute stack offset */
3470 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3471 OP_SYMBOL (IC_RESULT (uic))->onStack)
3474 /* if either one of them in far space then we cannot */
3475 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3476 isOperandInFarSpace (IC_LEFT (uic))) ||
3477 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3478 isOperandInFarSpace (IC_RIGHT (uic))))
3481 /* if the usage has only one operand then we can */
3482 if (IC_LEFT (uic) == NULL ||
3483 IC_RIGHT (uic) == NULL)
3486 /* make sure this is on the left side if not
3487 a '+' since '+' is commutative */
3488 if (ic->op != '+' &&
3489 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3492 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3493 /* if one of them is a literal then we can */
3494 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3495 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3496 (getSize (operandType (IC_RESULT (uic))) <= 1))
3498 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3502 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3503 /* if the other one is not on stack then we can */
3504 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3505 (IS_ITEMP (IC_RIGHT (uic)) ||
3506 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3507 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3510 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3511 (IS_ITEMP (IC_LEFT (uic)) ||
3512 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3513 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3519 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3520 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3525 /*-----------------------------------------------------------------*/
3526 /* packForPush - hueristics to reduce iCode for pushing */
3527 /*-----------------------------------------------------------------*/
3529 packForReceive (iCode * ic, eBBlock * ebp)
3533 debugLog ("%s\n", __FUNCTION__);
3534 debugAopGet (" result:", IC_RESULT (ic));
3535 debugAopGet (" left:", IC_LEFT (ic));
3536 debugAopGet (" right:", IC_RIGHT (ic));
3541 for (dic = ic->next; dic; dic = dic->next)
3546 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3547 debugLog (" used on left\n");
3548 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3549 debugLog (" used on right\n");
3550 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3551 debugLog (" used on result\n");
3553 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3554 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3559 debugLog (" hey we can remove this unnecessary assign\n");
3561 /*-----------------------------------------------------------------*/
3562 /* packForPush - hueristics to reduce iCode for pushing */
3563 /*-----------------------------------------------------------------*/
3565 packForPush (iCode * ic, eBBlock * ebp)
3569 debugLog ("%s\n", __FUNCTION__);
3570 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3573 /* must have only definition & one usage */
3574 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3575 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3578 /* find the definition */
3579 if (!(dic = hTabItemWithKey (iCodehTab,
3580 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3583 if (dic->op != '=' || POINTER_SET (dic))
3586 /* we now we know that it has one & only one def & use
3587 and the that the definition is an assignment */
3588 IC_LEFT (ic) = IC_RIGHT (dic);
3590 remiCodeFromeBBlock (ebp, dic);
3591 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3592 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3595 void printSymType(char * str, sym_link *sl)
3597 debugLog (" %s Symbol type: ",str);
3598 printTypeChain( sl, debugF);
3603 /*-----------------------------------------------------------------*/
3604 /* some debug code to print the symbol S_TYPE. Note that
3605 * the function checkSClass in src/SDCCsymt.c dinks with
3606 * the S_TYPE in ways the PIC port doesn't fully like...*/
3607 /*-----------------------------------------------------------------*/
3608 void isData(sym_link *sl)
3618 for ( ; sl; sl=sl->next) {
3620 switch (SPEC_SCLS(sl)) {
3622 case S_DATA: fprintf (of, "data "); break;
3623 case S_XDATA: fprintf (of, "xdata "); break;
3624 case S_SFR: fprintf (of, "sfr "); break;
3625 case S_SBIT: fprintf (of, "sbit "); break;
3626 case S_CODE: fprintf (of, "code "); break;
3627 case S_IDATA: fprintf (of, "idata "); break;
3628 case S_PDATA: fprintf (of, "pdata "); break;
3629 case S_LITERAL: fprintf (of, "literal "); break;
3630 case S_STACK: fprintf (of, "stack "); break;
3631 case S_XSTACK: fprintf (of, "xstack "); break;
3632 case S_BIT: fprintf (of, "bit "); break;
3633 case S_EEPROM: fprintf (of, "eeprom "); break;
3642 /*-----------------------------------------------------------------*/
3643 /* packRegisters - does some transformations to reduce register */
3645 /*-----------------------------------------------------------------*/
3647 packRegisters (eBBlock * ebp)
3652 debugLog ("%s\n", __FUNCTION__);
3658 /* look for assignments of the form */
3659 /* iTempNN = TRueSym (someoperation) SomeOperand */
3661 /* TrueSym := iTempNN:1 */
3662 for (ic = ebp->sch; ic; ic = ic->next)
3665 /* find assignment of the form TrueSym := iTempNN:1 */
3666 if (ic->op == '=' && !POINTER_SET (ic))
3667 change += packRegsForAssign (ic, ebp);
3671 if (POINTER_SET (ic))
3672 debugLog ("pointer is set\n");
3673 debugAopGet (" result:", IC_RESULT (ic));
3674 debugAopGet (" left:", IC_LEFT (ic));
3675 debugAopGet (" right:", IC_RIGHT (ic));
3684 for (ic = ebp->sch; ic; ic = ic->next) {
3686 if(IS_SYMOP ( IC_LEFT(ic))) {
3687 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3689 debugAopGet (" left:", IC_LEFT (ic));
3690 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3691 debugLog (" is a pointer\n");
3693 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3694 debugLog (" is volatile\n");
3698 printSymType(" ", OP_SYMBOL(IC_LEFT(ic))->type);
3701 if(IS_SYMOP ( IC_RIGHT(ic))) {
3702 debugAopGet (" right:", IC_RIGHT (ic));
3703 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3706 if(IS_SYMOP ( IC_RESULT(ic))) {
3707 debugAopGet (" result:", IC_RESULT (ic));
3708 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3711 if (POINTER_SET (ic))
3712 debugLog (" %d - Pointer set\n", __LINE__);
3715 /* if this is an itemp & result of a address of a true sym
3716 then mark this as rematerialisable */
3717 if (ic->op == ADDRESS_OF &&
3718 IS_ITEMP (IC_RESULT (ic)) &&
3719 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3720 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3721 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3724 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3726 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3727 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3728 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3732 /* if straight assignment then carry remat flag if
3733 this is the only definition */
3734 if (ic->op == '=' &&
3735 !POINTER_SET (ic) &&
3736 IS_SYMOP (IC_RIGHT (ic)) &&
3737 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3738 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3740 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3742 OP_SYMBOL (IC_RESULT (ic))->remat =
3743 OP_SYMBOL (IC_RIGHT (ic))->remat;
3744 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3745 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3748 /* if this is a +/- operation with a rematerizable
3749 then mark this as rematerializable as well */
3750 if ((ic->op == '+' || ic->op == '-') &&
3751 (IS_SYMOP (IC_LEFT (ic)) &&
3752 IS_ITEMP (IC_RESULT (ic)) &&
3753 OP_SYMBOL (IC_LEFT (ic))->remat &&
3754 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3755 IS_OP_LITERAL (IC_RIGHT (ic))))
3757 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3759 operandLitValue (IC_RIGHT (ic));
3760 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3761 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3762 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3765 /* mark the pointer usages */
3766 if (POINTER_SET (ic))
3768 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3769 debugLog (" marking as a pointer (set) =>");
3770 debugAopGet (" result:", IC_RESULT (ic));
3772 if (POINTER_GET (ic))
3774 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3775 debugLog (" marking as a pointer (get) =>");
3776 debugAopGet (" left:", IC_LEFT (ic));
3781 /* if we are using a symbol on the stack
3782 then we should say pic14_ptrRegReq */
3783 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3784 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3785 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3786 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3787 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3788 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3791 if (IS_SYMOP (IC_LEFT (ic)))
3792 pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3793 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3794 if (IS_SYMOP (IC_RIGHT (ic)))
3795 pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3796 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3797 if (IS_SYMOP (IC_RESULT (ic)))
3798 pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3799 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3802 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3806 /* if the condition of an if instruction
3807 is defined in the previous instruction then
3808 mark the itemp as a conditional */
3809 if ((IS_CONDITIONAL (ic) ||
3810 ((ic->op == BITWISEAND ||
3813 isBitwiseOptimizable (ic))) &&
3814 ic->next && ic->next->op == IFX &&
3815 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3816 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3819 debugLog (" %d\n", __LINE__);
3820 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3824 /* reduce for support function calls */
3825 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3826 packRegsForSupport (ic, ebp);
3828 /* if a parameter is passed, it's in W, so we may not
3829 need to place a copy in a register */
3830 if (ic->op == RECEIVE)
3831 packForReceive (ic, ebp);
3833 /* some cases the redundant moves can
3834 can be eliminated for return statements */
3835 if ((ic->op == RETURN || ic->op == SEND) &&
3836 !isOperandInFarSpace (IC_LEFT (ic)) &&
3838 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3840 /* if pointer set & left has a size more than
3841 one and right is not in far space */
3842 if (POINTER_SET (ic) &&
3843 !isOperandInFarSpace (IC_RIGHT (ic)) &&
3844 !OP_SYMBOL (IC_RESULT (ic))->remat &&
3845 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3846 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3848 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3850 /* if pointer get */
3851 if (POINTER_GET (ic) &&
3852 !isOperandInFarSpace (IC_RESULT (ic)) &&
3853 !OP_SYMBOL (IC_LEFT (ic))->remat &&
3854 !IS_OP_RUONLY (IC_RESULT (ic)) &&
3855 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3857 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3860 /* if this is cast for intergral promotion then
3861 check if only use of the definition of the
3862 operand being casted/ if yes then replace
3863 the result of that arithmetic operation with
3864 this result and get rid of the cast */
3865 if (ic->op == CAST) {
3867 sym_link *fromType = operandType (IC_RIGHT (ic));
3868 sym_link *toType = operandType (IC_LEFT (ic));
3870 debugLog (" %d - casting\n", __LINE__);
3872 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3873 getSize (fromType) != getSize (toType)) {
3876 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3879 if (IS_ARITHMETIC_OP (dic)) {
3881 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3882 IC_RESULT (dic) = IC_RESULT (ic);
3883 remiCodeFromeBBlock (ebp, ic);
3884 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3885 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3886 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3890 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3894 /* if the type from and type to are the same
3895 then if this is the only use then packit */
3896 if (compareType (operandType (IC_RIGHT (ic)),
3897 operandType (IC_LEFT (ic))) == 1) {
3899 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3902 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3903 IC_RESULT (dic) = IC_RESULT (ic);
3904 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3905 remiCodeFromeBBlock (ebp, ic);
3906 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3907 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3915 iTempNN := (some variable in farspace) V1
3920 if (ic->op == IPUSH)
3922 packForPush (ic, ebp);
3926 /* pack registers for accumulator use, when the
3927 result of an arithmetic or bit wise operation
3928 has only one use, that use is immediately following
3929 the defintion and the using iCode has only one
3930 operand or has two operands but one is literal &
3931 the result of that operation is not on stack then
3932 we can leave the result of this operation in acc:b
3934 if ((IS_ARITHMETIC_OP (ic)
3936 || IS_BITWISE_OP (ic)
3938 || ic->op == LEFT_OP || ic->op == RIGHT_OP
3941 IS_ITEMP (IC_RESULT (ic)) &&
3942 getSize (operandType (IC_RESULT (ic))) <= 2)
3944 packRegsForAccUse (ic);
3950 dumpEbbsToDebug (eBBlock ** ebbs, int count)
3954 if (!debug || !debugF)
3957 for (i = 0; i < count; i++)
3959 fprintf (debugF, "\n----------------------------------------------------------------\n");
3960 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
3961 ebbs[i]->entryLabel->name,
3964 ebbs[i]->isLastInLoop);
3965 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
3970 fprintf (debugF, "visited %d : hasFcall = %d\n",
3974 fprintf (debugF, "\ndefines bitVector :");
3975 bitVectDebugOn (ebbs[i]->defSet, debugF);
3976 fprintf (debugF, "\nlocal defines bitVector :");
3977 bitVectDebugOn (ebbs[i]->ldefs, debugF);
3978 fprintf (debugF, "\npointers Set bitvector :");
3979 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
3980 fprintf (debugF, "\nin pointers Set bitvector :");
3981 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
3982 fprintf (debugF, "\ninDefs Set bitvector :");
3983 bitVectDebugOn (ebbs[i]->inDefs, debugF);
3984 fprintf (debugF, "\noutDefs Set bitvector :");
3985 bitVectDebugOn (ebbs[i]->outDefs, debugF);
3986 fprintf (debugF, "\nusesDefs Set bitvector :");
3987 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
3988 fprintf (debugF, "\n----------------------------------------------------------------\n");
3989 printiCChain (ebbs[i]->sch, debugF);
3992 /*-----------------------------------------------------------------*/
3993 /* assignRegisters - assigns registers to each live range as need */
3994 /*-----------------------------------------------------------------*/
3996 pic14_assignRegisters (eBBlock ** ebbs, int count)
4001 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4002 debugLog ("\nebbs before optimizing:\n");
4003 dumpEbbsToDebug (ebbs, count);
4005 setToNull ((void *) &_G.funcrUsed);
4006 pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4009 /* change assignments this will remove some
4010 live ranges reducing some register pressure */
4011 for (i = 0; i < count; i++)
4012 packRegisters (ebbs[i]);
4019 debugLog("dir registers allocated so far:\n");
4020 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4023 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4024 reg = hTabNextItem(dynDirectRegNames, &hkey);
4029 if (options.dump_pack)
4030 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4032 /* first determine for each live range the number of
4033 registers & the type of registers required for each */
4036 /* and serially allocate registers */
4037 serialRegAssign (ebbs, count);
4039 /* if stack was extended then tell the user */
4042 /* werror(W_TOOMANY_SPILS,"stack", */
4043 /* _G.stackExtend,currFunc->name,""); */
4049 /* werror(W_TOOMANY_SPILS,"data space", */
4050 /* _G.dataExtend,currFunc->name,""); */
4054 /* after that create the register mask
4055 for each of the instruction */
4056 createRegMask (ebbs, count);
4058 /* redo that offsets for stacked automatic variables */
4059 redoStackOffsets ();
4061 if (options.dump_rassgn)
4062 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4064 /* now get back the chain */
4065 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4067 debugLog ("ebbs after optimizing:\n");
4068 dumpEbbsToDebug (ebbs, count);
4073 /* free up any _G.stackSpil locations allocated */
4074 applyToSet (_G.stackSpil, deallocStackSpil);
4076 setToNull ((void *) &_G.stackSpil);
4077 setToNull ((void *) &_G.spiltSet);
4078 /* mark all registers as free */
4079 //pic14_freeAllRegs ();
4081 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");