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)
1930 debugLog ("%s\n", __FUNCTION__);
1932 /* try for a ptr type */
1933 if ((reg = allocReg (REG_PTR)))
1936 /* try for gpr type */
1937 if ((reg = allocReg (REG_GPR)))
1940 /* we have to spil */
1941 if (!spilSomething (ic, ebp, sym))
1944 /* make sure partially assigned registers aren't reused */
1945 for (j=0; j<=sym->nRegs; j++)
1947 sym->regs[j]->isFree = 0;
1949 /* this looks like an infinite loop but
1950 in really selectSpil will abort */
1954 /*-----------------------------------------------------------------*/
1955 /* getRegGpr - will try for GPR if not spil */
1956 /*-----------------------------------------------------------------*/
1958 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1963 debugLog ("%s\n", __FUNCTION__);
1965 /* try for gpr type */
1966 if ((reg = allocReg (REG_GPR)))
1969 if (!pic14_ptrRegReq)
1970 if ((reg = allocReg (REG_PTR)))
1973 /* we have to spil */
1974 if (!spilSomething (ic, ebp, sym))
1977 /* make sure partially assigned registers aren't reused */
1978 for (j=0; j<=sym->nRegs; j++)
1980 sym->regs[j]->isFree = 0;
1982 /* this looks like an infinite loop but
1983 in really selectSpil will abort */
1987 /*-----------------------------------------------------------------*/
1988 /* symHasReg - symbol has a given register */
1989 /*-----------------------------------------------------------------*/
1991 symHasReg (symbol * sym, regs * reg)
1995 debugLog ("%s\n", __FUNCTION__);
1996 for (i = 0; i < sym->nRegs; i++)
1997 if (sym->regs[i] == reg)
2003 /*-----------------------------------------------------------------*/
2004 /* deassignLRs - check the live to and if they have registers & are */
2005 /* not spilt then free up the registers */
2006 /*-----------------------------------------------------------------*/
2008 deassignLRs (iCode * ic, eBBlock * ebp)
2014 debugLog ("%s\n", __FUNCTION__);
2015 for (sym = hTabFirstItem (liveRanges, &k); sym;
2016 sym = hTabNextItem (liveRanges, &k))
2019 symbol *psym = NULL;
2020 /* if it does not end here */
2021 if (sym->liveTo > ic->seq)
2024 /* if it was spilt on stack then we can
2025 mark the stack spil location as free */
2030 sym->usl.spillLoc->isFree = 1;
2036 if (!bitVectBitValue (_G.regAssigned, sym->key))
2039 /* special case check if this is an IFX &
2040 the privious one was a pop and the
2041 previous one was not spilt then keep track
2043 if (ic->op == IFX && ic->prev &&
2044 ic->prev->op == IPOP &&
2045 !ic->prev->parmPush &&
2046 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
2047 psym = OP_SYMBOL (IC_LEFT (ic->prev));
2053 bitVectUnSetBit (_G.regAssigned, sym->key);
2055 /* if the result of this one needs registers
2056 and does not have it then assign it right
2058 if (IC_RESULT (ic) &&
2059 !(SKIP_IC2 (ic) || /* not a special icode */
2060 ic->op == JUMPTABLE ||
2065 POINTER_SET (ic)) &&
2066 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
2067 result->liveTo > ic->seq && /* and will live beyond this */
2068 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
2069 result->regType == sym->regType && /* same register types */
2070 result->nRegs && /* which needs registers */
2071 !result->isspilt && /* and does not already have them */
2073 !bitVectBitValue (_G.regAssigned, result->key) &&
2074 /* the number of free regs + number of regs in this LR
2075 can accomodate the what result Needs */
2076 ((nfreeRegsType (result->regType) +
2077 sym->nRegs) >= result->nRegs)
2081 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2083 result->regs[i] = sym->regs[i];
2085 result->regs[i] = getRegGpr (ic, ebp, result);
2087 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2091 /* free the remaining */
2092 for (; i < sym->nRegs; i++)
2096 if (!symHasReg (psym, sym->regs[i]))
2097 freeReg (sym->regs[i]);
2100 freeReg (sym->regs[i]);
2107 /*-----------------------------------------------------------------*/
2108 /* reassignLR - reassign this to registers */
2109 /*-----------------------------------------------------------------*/
2111 reassignLR (operand * op)
2113 symbol *sym = OP_SYMBOL (op);
2116 debugLog ("%s\n", __FUNCTION__);
2117 /* not spilt any more */
2118 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2119 bitVectUnSetBit (_G.spiltSet, sym->key);
2121 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2125 for (i = 0; i < sym->nRegs; i++)
2126 sym->regs[i]->isFree = 0;
2129 /*-----------------------------------------------------------------*/
2130 /* willCauseSpill - determines if allocating will cause a spill */
2131 /*-----------------------------------------------------------------*/
2133 willCauseSpill (int nr, int rt)
2135 debugLog ("%s\n", __FUNCTION__);
2136 /* first check if there are any avlb registers
2137 of te type required */
2140 /* special case for pointer type
2141 if pointer type not avlb then
2142 check for type gpr */
2143 if (nFreeRegs (rt) >= nr)
2145 if (nFreeRegs (REG_GPR) >= nr)
2150 if (pic14_ptrRegReq)
2152 if (nFreeRegs (rt) >= nr)
2157 if (nFreeRegs (REG_PTR) +
2158 nFreeRegs (REG_GPR) >= nr)
2163 debugLog (" ... yep it will (cause a spill)\n");
2164 /* it will cause a spil */
2168 /*-----------------------------------------------------------------*/
2169 /* positionRegs - the allocator can allocate same registers to res- */
2170 /* ult and operand, if this happens make sure they are in the same */
2171 /* position as the operand otherwise chaos results */
2172 /*-----------------------------------------------------------------*/
2174 positionRegs (symbol * result, symbol * opsym, int lineno)
2176 int count = min (result->nRegs, opsym->nRegs);
2177 int i, j = 0, shared = 0;
2179 debugLog ("%s\n", __FUNCTION__);
2180 /* if the result has been spilt then cannot share */
2185 /* first make sure that they actually share */
2186 for (i = 0; i < count; i++)
2188 for (j = 0; j < count; j++)
2190 if (result->regs[i] == opsym->regs[j] && i != j)
2200 regs *tmp = result->regs[i];
2201 result->regs[i] = result->regs[j];
2202 result->regs[j] = tmp;
2207 /*------------------------------------------------------------------*/
2208 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2209 /* it should either have registers or have beed spilled. Otherwise, */
2210 /* there was an uninitialized variable, so just spill this to get */
2211 /* the operand in a valid state. */
2212 /*------------------------------------------------------------------*/
2214 verifyRegsAssigned (operand *op, iCode * ic)
2219 if (!IS_ITEMP (op)) return;
2221 sym = OP_SYMBOL (op);
2222 if (sym->isspilt) return;
2223 if (!sym->nRegs) return;
2224 if (sym->regs[0]) return;
2226 werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2227 sym->prereqv ? sym->prereqv->name : sym->name);
2232 /*-----------------------------------------------------------------*/
2233 /* serialRegAssign - serially allocate registers to the variables */
2234 /*-----------------------------------------------------------------*/
2236 serialRegAssign (eBBlock ** ebbs, int count)
2240 debugLog ("%s\n", __FUNCTION__);
2241 /* for all blocks */
2242 for (i = 0; i < count; i++)
2247 if (ebbs[i]->noPath &&
2248 (ebbs[i]->entryLabel != entryLabel &&
2249 ebbs[i]->entryLabel != returnLabel))
2252 /* of all instructions do */
2253 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2256 debugLog (" op: %s\n", decodeOp (ic->op));
2258 /* if this is an ipop that means some live
2259 range will have to be assigned again */
2261 reassignLR (IC_LEFT (ic));
2263 /* if result is present && is a true symbol */
2264 if (IC_RESULT (ic) && ic->op != IFX &&
2265 IS_TRUE_SYMOP (IC_RESULT (ic)))
2266 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2268 /* take away registers from live
2269 ranges that end at this instruction */
2270 deassignLRs (ic, ebbs[i]);
2272 /* some don't need registers */
2273 if (SKIP_IC2 (ic) ||
2274 ic->op == JUMPTABLE ||
2278 (IC_RESULT (ic) && POINTER_SET (ic)))
2281 /* now we need to allocate registers
2282 only for the result */
2285 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2291 /* if it does not need or is spilt
2292 or is already assigned to registers
2293 or will not live beyond this instructions */
2296 bitVectBitValue (_G.regAssigned, sym->key) ||
2297 sym->liveTo <= ic->seq)
2300 /* if some liverange has been spilt at the block level
2301 and this one live beyond this block then spil this
2303 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2308 /* if trying to allocate this will cause
2309 a spill and there is nothing to spill
2310 or this one is rematerializable then
2312 willCS = willCauseSpill (sym->nRegs, sym->regType);
2313 spillable = computeSpillable (ic);
2315 (willCS && bitVectIsZero (spillable)))
2323 /* if it has a spillocation & is used less than
2324 all other live ranges then spill this */
2326 if (sym->usl.spillLoc) {
2327 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2328 allLRs, ebbs[i], ic));
2329 if (leastUsed && leastUsed->used > sym->used) {
2334 /* if none of the liveRanges have a spillLocation then better
2335 to spill this one than anything else already assigned to registers */
2336 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2337 /* if this is local to this block then we might find a block spil */
2338 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2346 if (ic->op == RECEIVE)
2347 debugLog ("When I get clever, I'll optimize the receive logic\n");
2349 /* if we need ptr regs for the right side
2351 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2352 <= (unsigned) PTRSIZE)
2357 /* else we assign registers to it */
2358 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2360 debugLog (" %d - \n", __LINE__);
2362 bitVectDebugOn(_G.regAssigned, debugF);
2363 for (j = 0; j < sym->nRegs; j++)
2365 if (sym->regType == REG_PTR)
2366 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2368 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2370 /* if the allocation failed which means
2371 this was spilt then break */
2375 debugLog (" %d - \n", __LINE__);
2377 /* if it shares registers with operands make sure
2378 that they are in the same position */
2379 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2380 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2381 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2382 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2383 /* do the same for the right operand */
2384 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2385 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2386 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2387 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2389 debugLog (" %d - \n", __LINE__);
2392 debugLog (" %d - \n", __LINE__);
2401 /* Check for and fix any problems with uninitialized operands */
2402 for (i = 0; i < count; i++)
2406 if (ebbs[i]->noPath &&
2407 (ebbs[i]->entryLabel != entryLabel &&
2408 ebbs[i]->entryLabel != returnLabel))
2411 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2418 verifyRegsAssigned (IC_COND (ic), ic);
2422 if (ic->op == JUMPTABLE)
2424 verifyRegsAssigned (IC_JTCOND (ic), ic);
2428 verifyRegsAssigned (IC_RESULT (ic), ic);
2429 verifyRegsAssigned (IC_LEFT (ic), ic);
2430 verifyRegsAssigned (IC_RIGHT (ic), ic);
2436 /*-----------------------------------------------------------------*/
2437 /* rUmaskForOp :- returns register mask for an operand */
2438 /*-----------------------------------------------------------------*/
2440 rUmaskForOp (operand * op)
2446 debugLog ("%s\n", __FUNCTION__);
2447 /* only temporaries are assigned registers */
2451 sym = OP_SYMBOL (op);
2453 /* if spilt or no registers assigned to it
2455 if (sym->isspilt || !sym->nRegs)
2458 rumask = newBitVect (pic14_nRegs);
2460 for (j = 0; j < sym->nRegs; j++)
2462 rumask = bitVectSetBit (rumask,
2463 sym->regs[j]->rIdx);
2469 /*-----------------------------------------------------------------*/
2470 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2471 /*-----------------------------------------------------------------*/
2473 regsUsedIniCode (iCode * ic)
2475 bitVect *rmask = newBitVect (pic14_nRegs);
2477 debugLog ("%s\n", __FUNCTION__);
2478 /* do the special cases first */
2481 rmask = bitVectUnion (rmask,
2482 rUmaskForOp (IC_COND (ic)));
2486 /* for the jumptable */
2487 if (ic->op == JUMPTABLE)
2489 rmask = bitVectUnion (rmask,
2490 rUmaskForOp (IC_JTCOND (ic)));
2495 /* of all other cases */
2497 rmask = bitVectUnion (rmask,
2498 rUmaskForOp (IC_LEFT (ic)));
2502 rmask = bitVectUnion (rmask,
2503 rUmaskForOp (IC_RIGHT (ic)));
2506 rmask = bitVectUnion (rmask,
2507 rUmaskForOp (IC_RESULT (ic)));
2513 /*-----------------------------------------------------------------*/
2514 /* createRegMask - for each instruction will determine the regsUsed */
2515 /*-----------------------------------------------------------------*/
2517 createRegMask (eBBlock ** ebbs, int count)
2521 debugLog ("%s\n", __FUNCTION__);
2522 /* for all blocks */
2523 for (i = 0; i < count; i++)
2527 if (ebbs[i]->noPath &&
2528 (ebbs[i]->entryLabel != entryLabel &&
2529 ebbs[i]->entryLabel != returnLabel))
2532 /* for all instructions */
2533 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2538 if (SKIP_IC2 (ic) || !ic->rlive)
2541 /* first mark the registers used in this
2543 ic->rUsed = regsUsedIniCode (ic);
2544 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2546 /* now create the register mask for those
2547 registers that are in use : this is a
2548 super set of ic->rUsed */
2549 ic->rMask = newBitVect (pic14_nRegs + 1);
2551 /* for all live Ranges alive at this point */
2552 for (j = 1; j < ic->rlive->size; j++)
2557 /* if not alive then continue */
2558 if (!bitVectBitValue (ic->rlive, j))
2561 /* find the live range we are interested in */
2562 if (!(sym = hTabItemWithKey (liveRanges, j)))
2564 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2565 "createRegMask cannot find live range");
2569 /* if no register assigned to it */
2570 if (!sym->nRegs || sym->isspilt)
2573 /* for all the registers allocated to it */
2574 for (k = 0; k < sym->nRegs; k++)
2577 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2583 /*-----------------------------------------------------------------*/
2584 /* rematStr - returns the rematerialized string for a remat var */
2585 /*-----------------------------------------------------------------*/
2587 rematStr (symbol * sym)
2590 iCode *ic = sym->rematiCode;
2591 symbol *psym = NULL;
2593 debugLog ("%s\n", __FUNCTION__);
2595 //printf ("%s\n", s);
2597 /* if plus or minus print the right hand side */
2599 if (ic->op == '+' || ic->op == '-') {
2601 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2603 sprintf (s, "(%s %c 0x%04x)",
2604 OP_SYMBOL (IC_LEFT (ric))->rname,
2606 (int) operandLitValue (IC_RIGHT (ic)));
2609 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2611 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2612 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2617 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2618 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2620 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2625 /*-----------------------------------------------------------------*/
2626 /* rematStr - returns the rematerialized string for a remat var */
2627 /*-----------------------------------------------------------------*/
2629 rematStr (symbol * sym)
2632 iCode *ic = sym->rematiCode;
2634 debugLog ("%s\n", __FUNCTION__);
2639 /* if plus or minus print the right hand side */
2641 if (ic->op == '+' || ic->op == '-') {
2642 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2645 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2649 if (ic->op == '+' || ic->op == '-')
2651 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2652 sprintf (s, "(%s %c 0x%04x)",
2653 OP_SYMBOL (IC_LEFT (ric))->rname,
2655 (int) operandLitValue (IC_RIGHT (ic)));
2658 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2660 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2664 /* we reached the end */
2665 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2669 printf ("%s\n", buffer);
2674 /*-----------------------------------------------------------------*/
2675 /* regTypeNum - computes the type & number of registers required */
2676 /*-----------------------------------------------------------------*/
2684 debugLog ("%s\n", __FUNCTION__);
2685 /* for each live range do */
2686 for (sym = hTabFirstItem (liveRanges, &k); sym;
2687 sym = hTabNextItem (liveRanges, &k)) {
2689 debugLog (" %d - %s\n", __LINE__, sym->rname);
2691 /* if used zero times then no registers needed */
2692 if ((sym->liveTo - sym->liveFrom) == 0)
2696 /* if the live range is a temporary */
2699 debugLog (" %d - itemp register\n", __LINE__);
2701 /* if the type is marked as a conditional */
2702 if (sym->regType == REG_CND)
2705 /* if used in return only then we don't
2708 if (IS_AGGREGATE (sym->type) || sym->isptr)
2709 sym->type = aggrToPtr (sym->type, FALSE);
2710 debugLog (" %d - no reg needed - accumulator used\n", __LINE__);
2716 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2717 // sym->type = aggrToPtr (sym->type, FALSE);
2718 debugLog (" %d - used as a return\n", __LINE__);
2723 /* if the symbol has only one definition &
2724 that definition is a get_pointer and the
2725 pointer we are getting is rematerializable and
2728 if (bitVectnBitsOn (sym->defs) == 1 &&
2729 (ic = hTabItemWithKey (iCodehTab,
2730 bitVectFirstBit (sym->defs))) &&
2732 !IS_BITVAR (sym->etype) &&
2733 (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2735 if (ptrPseudoSymSafe (sym, ic)) {
2737 debugLog (" %d - \n", __LINE__);
2739 /* create a psuedo symbol & force a spil */
2740 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2741 symbol *psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2742 psym->type = sym->type;
2743 psym->etype = sym->etype;
2744 psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2745 strcpy (psym->rname, psym->name);
2747 sym->usl.spillLoc = psym;
2751 /* if in data space or idata space then try to
2752 allocate pointer register */
2756 /* if not then we require registers */
2757 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2758 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2759 getSize (sym->type));
2762 if(IS_PTR_CONST (sym->type)) {
2763 debugLog (" %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2767 if (sym->nRegs > 4) {
2768 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2769 printTypeChain (sym->type, stderr);
2770 fprintf (stderr, "\n");
2773 /* determine the type of register required */
2774 if (sym->nRegs == 1 &&
2775 IS_PTR (sym->type) &&
2777 sym->regType = REG_PTR;
2779 sym->regType = REG_GPR;
2782 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2786 /* for the first run we don't provide */
2787 /* registers for true symbols we will */
2788 /* see how things go */
2793 DEFSETFUNC (markRegFree)
2795 ((regs *)item)->isFree = 1;
2800 DEFSETFUNC (deallocReg)
2802 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2803 ((regs *)item)->isFree = 1;
2804 ((regs *)item)->wasUsed = 0;
2808 /*-----------------------------------------------------------------*/
2809 /* freeAllRegs - mark all registers as free */
2810 /*-----------------------------------------------------------------*/
2812 pic14_freeAllRegs ()
2816 debugLog ("%s\n", __FUNCTION__);
2818 applyToSet(dynAllocRegs,markRegFree);
2819 applyToSet(dynStackRegs,markRegFree);
2822 for (i = 0; i < pic14_nRegs; i++)
2823 regspic14[i].isFree = 1;
2827 /*-----------------------------------------------------------------*/
2828 /*-----------------------------------------------------------------*/
2830 pic14_deallocateAllRegs ()
2834 debugLog ("%s\n", __FUNCTION__);
2836 applyToSet(dynAllocRegs,deallocReg);
2839 for (i = 0; i < pic14_nRegs; i++) {
2840 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2841 regspic14[i].isFree = 1;
2842 regspic14[i].wasUsed = 0;
2849 /*-----------------------------------------------------------------*/
2850 /* deallocStackSpil - this will set the stack pointer back */
2851 /*-----------------------------------------------------------------*/
2853 DEFSETFUNC (deallocStackSpil)
2857 debugLog ("%s\n", __FUNCTION__);
2862 /*-----------------------------------------------------------------*/
2863 /* farSpacePackable - returns the packable icode for far variables */
2864 /*-----------------------------------------------------------------*/
2866 farSpacePackable (iCode * ic)
2870 debugLog ("%s\n", __FUNCTION__);
2871 /* go thru till we find a definition for the
2872 symbol on the right */
2873 for (dic = ic->prev; dic; dic = dic->prev)
2876 /* if the definition is a call then no */
2877 if ((dic->op == CALL || dic->op == PCALL) &&
2878 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2883 /* if shift by unknown amount then not */
2884 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2885 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2888 /* if pointer get and size > 1 */
2889 if (POINTER_GET (dic) &&
2890 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2893 if (POINTER_SET (dic) &&
2894 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2897 /* if any three is a true symbol in far space */
2898 if (IC_RESULT (dic) &&
2899 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2900 isOperandInFarSpace (IC_RESULT (dic)))
2903 if (IC_RIGHT (dic) &&
2904 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2905 isOperandInFarSpace (IC_RIGHT (dic)) &&
2906 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2909 if (IC_LEFT (dic) &&
2910 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2911 isOperandInFarSpace (IC_LEFT (dic)) &&
2912 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2915 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2917 if ((dic->op == LEFT_OP ||
2918 dic->op == RIGHT_OP ||
2920 IS_OP_LITERAL (IC_RIGHT (dic)))
2930 /*-----------------------------------------------------------------*/
2931 /* packRegsForAssign - register reduction for assignment */
2932 /*-----------------------------------------------------------------*/
2934 packRegsForAssign (iCode * ic, eBBlock * ebp)
2939 debugLog ("%s\n", __FUNCTION__);
2941 debugAopGet (" result:", IC_RESULT (ic));
2942 debugAopGet (" left:", IC_LEFT (ic));
2943 debugAopGet (" right:", IC_RIGHT (ic));
2945 /* if this is at an absolute address, then get the address. */
2946 if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2947 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2948 debugLog (" %d - found config word declaration\n", __LINE__);
2949 if(IS_VALOP(IC_RIGHT(ic))) {
2950 debugLog (" setting config word to %x\n",
2951 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2952 assignConfigWordValue( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2953 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2956 /* remove the assignment from the iCode chain. */
2958 remiCodeFromeBBlock (ebp, ic);
2959 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2960 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2967 if (!IS_ITEMP (IC_RESULT (ic))) {
2968 allocDirReg(IC_RESULT (ic));
2969 debugLog (" %d - result is not temp\n", __LINE__);
2972 if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2973 debugLog (" %d - left is not temp, allocating\n", __LINE__);
2974 allocDirReg(IC_LEFT (ic));
2978 if (!IS_ITEMP (IC_RIGHT (ic))) {
2979 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2981 /* only pack if this is not a function pointer */
2982 if (!IS_REF (IC_RIGHT (ic)))
2983 allocDirReg(IC_RIGHT (ic));
2987 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2988 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2990 debugLog (" %d - not packing - right side fails \n", __LINE__);
2994 /* if the true symbol is defined in far space or on stack
2995 then we should not since this will increase register pressure */
2996 if (isOperandInFarSpace (IC_RESULT (ic)))
2998 if ((dic = farSpacePackable (ic)))
3004 /* find the definition of iTempNN scanning backwards if we find a
3005 a use of the true symbol before we find the definition then
3007 for (dic = ic->prev; dic; dic = dic->prev)
3010 /* if there is a function call and this is
3011 a parameter & not my parameter then don't pack it */
3012 if ((dic->op == CALL || dic->op == PCALL) &&
3013 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
3014 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
3016 debugLog (" %d - \n", __LINE__);
3024 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3025 IS_OP_VOLATILE (IC_RESULT (dic)))
3027 debugLog (" %d - dic is VOLATILE \n", __LINE__);
3032 if (IS_SYMOP (IC_RESULT (dic)) &&
3033 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3035 /* A previous result was assigned to the same register - we'll our definition */
3036 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
3037 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3038 if (POINTER_SET (dic))
3044 if (IS_SYMOP (IC_RIGHT (dic)) &&
3045 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3046 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3048 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
3053 if (IS_SYMOP (IC_LEFT (dic)) &&
3054 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3055 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3057 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
3062 if (POINTER_SET (dic) &&
3063 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3065 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
3073 return 0; /* did not find */
3075 /* if the result is on stack or iaccess then it must be
3076 the same atleast one of the operands */
3077 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3078 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3081 /* the operation has only one symbol
3082 operator then we can pack */
3083 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3084 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3087 if (!((IC_LEFT (dic) &&
3088 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3090 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3094 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3095 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3096 /* found the definition */
3097 /* replace the result with the result of */
3098 /* this assignment and remove this assignment */
3099 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3100 IC_RESULT (dic) = IC_RESULT (ic);
3102 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3104 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3106 /* delete from liverange table also
3107 delete from all the points inbetween and the new
3109 for (sic = dic; sic != ic; sic = sic->next)
3111 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3112 if (IS_ITEMP (IC_RESULT (dic)))
3113 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3116 remiCodeFromeBBlock (ebp, ic);
3117 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3118 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3119 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3125 /*-----------------------------------------------------------------*/
3126 /* findAssignToSym : scanning backwards looks for first assig found */
3127 /*-----------------------------------------------------------------*/
3129 findAssignToSym (operand * op, iCode * ic)
3133 debugLog ("%s\n", __FUNCTION__);
3134 for (dic = ic->prev; dic; dic = dic->prev)
3137 /* if definition by assignment */
3138 if (dic->op == '=' &&
3139 !POINTER_SET (dic) &&
3140 IC_RESULT (dic)->key == op->key
3141 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3145 /* we are interested only if defined in far space */
3146 /* or in stack space in case of + & - */
3148 /* if assigned to a non-symbol then return
3150 if (!IS_SYMOP (IC_RIGHT (dic)))
3153 /* if the symbol is in far space then
3155 if (isOperandInFarSpace (IC_RIGHT (dic)))
3158 /* for + & - operations make sure that
3159 if it is on the stack it is the same
3160 as one of the three operands */
3161 if ((ic->op == '+' || ic->op == '-') &&
3162 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3165 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3166 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3167 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3175 /* if we find an usage then we cannot delete it */
3176 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3179 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3182 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3186 /* now make sure that the right side of dic
3187 is not defined between ic & dic */
3190 iCode *sic = dic->next;
3192 for (; sic != ic; sic = sic->next)
3193 if (IC_RESULT (sic) &&
3194 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3203 /*-----------------------------------------------------------------*/
3204 /* packRegsForSupport :- reduce some registers for support calls */
3205 /*-----------------------------------------------------------------*/
3207 packRegsForSupport (iCode * ic, eBBlock * ebp)
3211 debugLog ("%s\n", __FUNCTION__);
3212 /* for the left & right operand :- look to see if the
3213 left was assigned a true symbol in far space in that
3214 case replace them */
3215 if (IS_ITEMP (IC_LEFT (ic)) &&
3216 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3218 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3224 debugAopGet ("removing left:", IC_LEFT (ic));
3226 /* found it we need to remove it from the
3228 for (sic = dic; sic != ic; sic = sic->next)
3229 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3231 IC_LEFT (ic)->operand.symOperand =
3232 IC_RIGHT (dic)->operand.symOperand;
3233 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3234 remiCodeFromeBBlock (ebp, dic);
3235 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3236 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3240 /* do the same for the right operand */
3243 IS_ITEMP (IC_RIGHT (ic)) &&
3244 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3246 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3252 /* if this is a subtraction & the result
3253 is a true symbol in far space then don't pack */
3254 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3256 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3257 if (IN_FARSPACE (SPEC_OCLS (etype)))
3261 debugAopGet ("removing right:", IC_RIGHT (ic));
3263 /* found it we need to remove it from the
3265 for (sic = dic; sic != ic; sic = sic->next)
3266 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3268 IC_RIGHT (ic)->operand.symOperand =
3269 IC_RIGHT (dic)->operand.symOperand;
3270 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3272 remiCodeFromeBBlock (ebp, dic);
3273 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3274 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3281 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3284 /*-----------------------------------------------------------------*/
3285 /* packRegsForOneuse : - will reduce some registers for single Use */
3286 /*-----------------------------------------------------------------*/
3288 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3293 debugLog ("%s\n", __FUNCTION__);
3294 /* if returning a literal then do nothing */
3298 /* only upto 2 bytes since we cannot predict
3299 the usage of b, & acc */
3300 if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3305 /* this routine will mark the a symbol as used in one
3306 instruction use only && if the definition is local
3307 (ie. within the basic block) && has only one definition &&
3308 that definition is either a return value from a
3309 function or does not contain any variables in
3311 uses = bitVectCopy (OP_USES (op));
3312 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3313 if (!bitVectIsZero (uses)) /* has other uses */
3316 /* if it has only one defintion */
3317 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3318 return NULL; /* has more than one definition */
3320 /* get that definition */
3322 hTabItemWithKey (iCodehTab,
3323 bitVectFirstBit (OP_DEFS (op)))))
3326 /* found the definition now check if it is local */
3327 if (dic->seq < ebp->fSeq ||
3328 dic->seq > ebp->lSeq)
3329 return NULL; /* non-local */
3331 /* now check if it is the return from
3333 if (dic->op == CALL || dic->op == PCALL)
3335 if (ic->op != SEND && ic->op != RETURN &&
3336 !POINTER_SET(ic) && !POINTER_GET(ic))
3338 OP_SYMBOL (op)->ruonly = 1;
3345 /* otherwise check that the definition does
3346 not contain any symbols in far space */
3347 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3348 isOperandInFarSpace (IC_RIGHT (dic)) ||
3349 IS_OP_RUONLY (IC_LEFT (ic)) ||
3350 IS_OP_RUONLY (IC_RIGHT (ic)))
3355 /* if pointer set then make sure the pointer
3357 if (POINTER_SET (dic) &&
3358 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3361 if (POINTER_GET (dic) &&
3362 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3367 /* also make sure the intervenening instructions
3368 don't have any thing in far space */
3369 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3372 /* if there is an intervening function call then no */
3373 if (dic->op == CALL || dic->op == PCALL)
3375 /* if pointer set then make sure the pointer
3377 if (POINTER_SET (dic) &&
3378 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3381 if (POINTER_GET (dic) &&
3382 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3385 /* if address of & the result is remat then okay */
3386 if (dic->op == ADDRESS_OF &&
3387 OP_SYMBOL (IC_RESULT (dic))->remat)
3390 /* if operand has size of three or more & this
3391 operation is a '*','/' or '%' then 'b' may
3393 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3394 getSize (operandType (op)) >= 3)
3397 /* if left or right or result is in far space */
3398 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3399 isOperandInFarSpace (IC_RIGHT (dic)) ||
3400 isOperandInFarSpace (IC_RESULT (dic)) ||
3401 IS_OP_RUONLY (IC_LEFT (dic)) ||
3402 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3403 IS_OP_RUONLY (IC_RESULT (dic)))
3409 OP_SYMBOL (op)->ruonly = 1;
3414 /*-----------------------------------------------------------------*/
3415 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3416 /*-----------------------------------------------------------------*/
3418 isBitwiseOptimizable (iCode * ic)
3420 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3421 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3423 debugLog ("%s\n", __FUNCTION__);
3424 /* bitwise operations are considered optimizable
3425 under the following conditions (Jean-Louis VERN)
3437 if (IS_LITERAL (rtype) ||
3438 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3444 /*-----------------------------------------------------------------*/
3445 /* packRegsForAccUse - pack registers for acc use */
3446 /*-----------------------------------------------------------------*/
3448 packRegsForAccUse (iCode * ic)
3452 debugLog ("%s\n", __FUNCTION__);
3454 /* if this is an aggregate, e.g. a one byte char array */
3455 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3458 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3460 /* if + or - then it has to be one byte result */
3461 if ((ic->op == '+' || ic->op == '-')
3462 && getSize (operandType (IC_RESULT (ic))) > 1)
3465 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3466 /* if shift operation make sure right side is not a literal */
3467 if (ic->op == RIGHT_OP &&
3468 (isOperandLiteral (IC_RIGHT (ic)) ||
3469 getSize (operandType (IC_RESULT (ic))) > 1))
3472 if (ic->op == LEFT_OP &&
3473 (isOperandLiteral (IC_RIGHT (ic)) ||
3474 getSize (operandType (IC_RESULT (ic))) > 1))
3477 if (IS_BITWISE_OP (ic) &&
3478 getSize (operandType (IC_RESULT (ic))) > 1)
3482 /* has only one definition */
3483 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3486 /* has only one use */
3487 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3490 /* and the usage immediately follows this iCode */
3491 if (!(uic = hTabItemWithKey (iCodehTab,
3492 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3495 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3496 if (ic->next != uic)
3499 /* if it is a conditional branch then we definitely can */
3503 if (uic->op == JUMPTABLE)
3506 /* if the usage is not is an assignment
3507 or an arithmetic / bitwise / shift operation then not */
3508 if (POINTER_SET (uic) &&
3509 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3512 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3513 if (uic->op != '=' &&
3514 !IS_ARITHMETIC_OP (uic) &&
3515 !IS_BITWISE_OP (uic) &&
3516 uic->op != LEFT_OP &&
3517 uic->op != RIGHT_OP)
3520 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3521 /* if used in ^ operation then make sure right is not a
3523 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3526 /* if shift operation make sure right side is not a literal */
3527 if (uic->op == RIGHT_OP &&
3528 (isOperandLiteral (IC_RIGHT (uic)) ||
3529 getSize (operandType (IC_RESULT (uic))) > 1))
3532 if (uic->op == LEFT_OP &&
3533 (isOperandLiteral (IC_RIGHT (uic)) ||
3534 getSize (operandType (IC_RESULT (uic))) > 1))
3537 /* make sure that the result of this icode is not on the
3538 stack, since acc is used to compute stack offset */
3539 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3540 OP_SYMBOL (IC_RESULT (uic))->onStack)
3543 /* if either one of them in far space then we cannot */
3544 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3545 isOperandInFarSpace (IC_LEFT (uic))) ||
3546 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3547 isOperandInFarSpace (IC_RIGHT (uic))))
3550 /* if the usage has only one operand then we can */
3551 if (IC_LEFT (uic) == NULL ||
3552 IC_RIGHT (uic) == NULL)
3555 /* make sure this is on the left side if not
3556 a '+' since '+' is commutative */
3557 if (ic->op != '+' &&
3558 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3561 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3562 /* if one of them is a literal then we can */
3563 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3564 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3565 (getSize (operandType (IC_RESULT (uic))) <= 1))
3567 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3571 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3572 /* if the other one is not on stack then we can */
3573 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3574 (IS_ITEMP (IC_RIGHT (uic)) ||
3575 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3576 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3579 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3580 (IS_ITEMP (IC_LEFT (uic)) ||
3581 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3582 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3588 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3589 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3594 /*-----------------------------------------------------------------*/
3595 /* packForPush - hueristics to reduce iCode for pushing */
3596 /*-----------------------------------------------------------------*/
3598 packForReceive (iCode * ic, eBBlock * ebp)
3602 debugLog ("%s\n", __FUNCTION__);
3603 debugAopGet (" result:", IC_RESULT (ic));
3604 debugAopGet (" left:", IC_LEFT (ic));
3605 debugAopGet (" right:", IC_RIGHT (ic));
3610 for (dic = ic->next; dic; dic = dic->next)
3615 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3616 debugLog (" used on left\n");
3617 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3618 debugLog (" used on right\n");
3619 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3620 debugLog (" used on result\n");
3622 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3623 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3628 debugLog (" hey we can remove this unnecessary assign\n");
3630 /*-----------------------------------------------------------------*/
3631 /* packForPush - hueristics to reduce iCode for pushing */
3632 /*-----------------------------------------------------------------*/
3634 packForPush (iCode * ic, eBBlock * ebp)
3638 debugLog ("%s\n", __FUNCTION__);
3639 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3642 /* must have only definition & one usage */
3643 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3644 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3647 /* find the definition */
3648 if (!(dic = hTabItemWithKey (iCodehTab,
3649 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3652 if (dic->op != '=' || POINTER_SET (dic))
3655 /* we now we know that it has one & only one def & use
3656 and the that the definition is an assignment */
3657 IC_LEFT (ic) = IC_RIGHT (dic);
3659 remiCodeFromeBBlock (ebp, dic);
3660 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3661 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3664 void printSymType(char * str, sym_link *sl)
3666 debugLog (" %s Symbol type: ",str);
3667 printTypeChain( sl, debugF);
3672 /*-----------------------------------------------------------------*/
3673 /* some debug code to print the symbol S_TYPE. Note that
3674 * the function checkSClass in src/SDCCsymt.c dinks with
3675 * the S_TYPE in ways the PIC port doesn't fully like...*/
3676 /*-----------------------------------------------------------------*/
3677 void isData(sym_link *sl)
3687 for ( ; sl; sl=sl->next) {
3689 switch (SPEC_SCLS(sl)) {
3691 case S_DATA: fprintf (of, "data "); break;
3692 case S_XDATA: fprintf (of, "xdata "); break;
3693 case S_SFR: fprintf (of, "sfr "); break;
3694 case S_SBIT: fprintf (of, "sbit "); break;
3695 case S_CODE: fprintf (of, "code "); break;
3696 case S_IDATA: fprintf (of, "idata "); break;
3697 case S_PDATA: fprintf (of, "pdata "); break;
3698 case S_LITERAL: fprintf (of, "literal "); break;
3699 case S_STACK: fprintf (of, "stack "); break;
3700 case S_XSTACK: fprintf (of, "xstack "); break;
3701 case S_BIT: fprintf (of, "bit "); break;
3702 case S_EEPROM: fprintf (of, "eeprom "); break;
3711 /*-----------------------------------------------------------------*/
3712 /* packRegisters - does some transformations to reduce register */
3714 /*-----------------------------------------------------------------*/
3716 packRegisters (eBBlock * ebp)
3721 debugLog ("%s\n", __FUNCTION__);
3727 /* look for assignments of the form */
3728 /* iTempNN = TRueSym (someoperation) SomeOperand */
3730 /* TrueSym := iTempNN:1 */
3731 for (ic = ebp->sch; ic; ic = ic->next)
3734 /* find assignment of the form TrueSym := iTempNN:1 */
3735 if (ic->op == '=' && !POINTER_SET (ic))
3736 change += packRegsForAssign (ic, ebp);
3740 if (POINTER_SET (ic))
3741 debugLog ("pointer is set\n");
3742 debugAopGet (" result:", IC_RESULT (ic));
3743 debugAopGet (" left:", IC_LEFT (ic));
3744 debugAopGet (" right:", IC_RIGHT (ic));
3753 for (ic = ebp->sch; ic; ic = ic->next) {
3755 if(IS_SYMOP ( IC_LEFT(ic))) {
3756 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3758 debugAopGet (" left:", IC_LEFT (ic));
3759 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3760 debugLog (" is a pointer\n");
3762 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3763 debugLog (" is volatile\n");
3767 printSymType(" ", OP_SYMBOL(IC_LEFT(ic))->type);
3770 if(IS_SYMOP ( IC_RIGHT(ic))) {
3771 debugAopGet (" right:", IC_RIGHT (ic));
3772 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3775 if(IS_SYMOP ( IC_RESULT(ic))) {
3776 debugAopGet (" result:", IC_RESULT (ic));
3777 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3780 if (POINTER_SET (ic))
3781 debugLog (" %d - Pointer set\n", __LINE__);
3784 /* if this is an itemp & result of a address of a true sym
3785 then mark this as rematerialisable */
3786 if (ic->op == ADDRESS_OF &&
3787 IS_ITEMP (IC_RESULT (ic)) &&
3788 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3789 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3790 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3793 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3795 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3796 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3797 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3801 /* if straight assignment then carry remat flag if
3802 this is the only definition */
3803 if (ic->op == '=' &&
3804 !POINTER_SET (ic) &&
3805 IS_SYMOP (IC_RIGHT (ic)) &&
3806 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3807 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3809 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3811 OP_SYMBOL (IC_RESULT (ic))->remat =
3812 OP_SYMBOL (IC_RIGHT (ic))->remat;
3813 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3814 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3817 /* if this is a +/- operation with a rematerizable
3818 then mark this as rematerializable as well */
3819 if ((ic->op == '+' || ic->op == '-') &&
3820 (IS_SYMOP (IC_LEFT (ic)) &&
3821 IS_ITEMP (IC_RESULT (ic)) &&
3822 OP_SYMBOL (IC_LEFT (ic))->remat &&
3823 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3824 IS_OP_LITERAL (IC_RIGHT (ic))))
3826 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3828 operandLitValue (IC_RIGHT (ic));
3829 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3830 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3831 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3834 /* mark the pointer usages */
3835 if (POINTER_SET (ic))
3837 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3838 debugLog (" marking as a pointer (set) =>");
3839 debugAopGet (" result:", IC_RESULT (ic));
3841 if (POINTER_GET (ic))
3843 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3844 debugLog (" marking as a pointer (get) =>");
3845 debugAopGet (" left:", IC_LEFT (ic));
3850 /* if we are using a symbol on the stack
3851 then we should say pic14_ptrRegReq */
3852 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3853 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3854 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3855 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3856 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3857 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3860 if (IS_SYMOP (IC_LEFT (ic)))
3861 pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3862 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3863 if (IS_SYMOP (IC_RIGHT (ic)))
3864 pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3865 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3866 if (IS_SYMOP (IC_RESULT (ic)))
3867 pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3868 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3871 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3875 /* if the condition of an if instruction
3876 is defined in the previous instruction then
3877 mark the itemp as a conditional */
3878 if ((IS_CONDITIONAL (ic) ||
3879 ((ic->op == BITWISEAND ||
3882 isBitwiseOptimizable (ic))) &&
3883 ic->next && ic->next->op == IFX &&
3884 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3885 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3888 debugLog (" %d\n", __LINE__);
3889 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3893 /* reduce for support function calls */
3894 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3895 packRegsForSupport (ic, ebp);
3897 /* if a parameter is passed, it's in W, so we may not
3898 need to place a copy in a register */
3899 if (ic->op == RECEIVE)
3900 packForReceive (ic, ebp);
3902 /* some cases the redundant moves can
3903 can be eliminated for return statements */
3904 if ((ic->op == RETURN || ic->op == SEND) &&
3905 !isOperandInFarSpace (IC_LEFT (ic)) &&
3907 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3909 /* if pointer set & left has a size more than
3910 one and right is not in far space */
3911 if (POINTER_SET (ic) &&
3912 !isOperandInFarSpace (IC_RIGHT (ic)) &&
3913 !OP_SYMBOL (IC_RESULT (ic))->remat &&
3914 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3915 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3917 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3919 /* if pointer get */
3920 if (POINTER_GET (ic) &&
3921 !isOperandInFarSpace (IC_RESULT (ic)) &&
3922 !OP_SYMBOL (IC_LEFT (ic))->remat &&
3923 !IS_OP_RUONLY (IC_RESULT (ic)) &&
3924 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3926 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3929 /* if this is cast for intergral promotion then
3930 check if only use of the definition of the
3931 operand being casted/ if yes then replace
3932 the result of that arithmetic operation with
3933 this result and get rid of the cast */
3934 if (ic->op == CAST) {
3936 sym_link *fromType = operandType (IC_RIGHT (ic));
3937 sym_link *toType = operandType (IC_LEFT (ic));
3939 debugLog (" %d - casting\n", __LINE__);
3941 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3942 getSize (fromType) != getSize (toType)) {
3945 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3948 if (IS_ARITHMETIC_OP (dic)) {
3950 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3951 IC_RESULT (dic) = IC_RESULT (ic);
3952 remiCodeFromeBBlock (ebp, ic);
3953 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3954 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3955 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3959 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3963 /* if the type from and type to are the same
3964 then if this is the only use then packit */
3965 if (compareType (operandType (IC_RIGHT (ic)),
3966 operandType (IC_LEFT (ic))) == 1) {
3968 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3971 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3972 IC_RESULT (dic) = IC_RESULT (ic);
3973 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3974 remiCodeFromeBBlock (ebp, ic);
3975 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3976 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3984 iTempNN := (some variable in farspace) V1
3989 if (ic->op == IPUSH)
3991 packForPush (ic, ebp);
3995 /* pack registers for accumulator use, when the
3996 result of an arithmetic or bit wise operation
3997 has only one use, that use is immediately following
3998 the defintion and the using iCode has only one
3999 operand or has two operands but one is literal &
4000 the result of that operation is not on stack then
4001 we can leave the result of this operation in acc:b
4003 if ((IS_ARITHMETIC_OP (ic)
4005 || IS_BITWISE_OP (ic)
4007 || ic->op == LEFT_OP || ic->op == RIGHT_OP
4010 IS_ITEMP (IC_RESULT (ic)) &&
4011 getSize (operandType (IC_RESULT (ic))) <= 2)
4013 packRegsForAccUse (ic);
4019 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4023 if (!debug || !debugF)
4026 for (i = 0; i < count; i++)
4028 fprintf (debugF, "\n----------------------------------------------------------------\n");
4029 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4030 ebbs[i]->entryLabel->name,
4033 ebbs[i]->isLastInLoop);
4034 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4039 fprintf (debugF, "visited %d : hasFcall = %d\n",
4043 fprintf (debugF, "\ndefines bitVector :");
4044 bitVectDebugOn (ebbs[i]->defSet, debugF);
4045 fprintf (debugF, "\nlocal defines bitVector :");
4046 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4047 fprintf (debugF, "\npointers Set bitvector :");
4048 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4049 fprintf (debugF, "\nin pointers Set bitvector :");
4050 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4051 fprintf (debugF, "\ninDefs Set bitvector :");
4052 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4053 fprintf (debugF, "\noutDefs Set bitvector :");
4054 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4055 fprintf (debugF, "\nusesDefs Set bitvector :");
4056 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4057 fprintf (debugF, "\n----------------------------------------------------------------\n");
4058 printiCChain (ebbs[i]->sch, debugF);
4061 /*-----------------------------------------------------------------*/
4062 /* assignRegisters - assigns registers to each live range as need */
4063 /*-----------------------------------------------------------------*/
4065 pic14_assignRegisters (eBBlock ** ebbs, int count)
4070 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4071 debugLog ("\nebbs before optimizing:\n");
4072 dumpEbbsToDebug (ebbs, count);
4074 setToNull ((void *) &_G.funcrUsed);
4075 pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4078 /* change assignments this will remove some
4079 live ranges reducing some register pressure */
4080 for (i = 0; i < count; i++)
4081 packRegisters (ebbs[i]);
4088 debugLog("dir registers allocated so far:\n");
4089 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4092 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4093 reg = hTabNextItem(dynDirectRegNames, &hkey);
4098 if (options.dump_pack)
4099 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4101 /* first determine for each live range the number of
4102 registers & the type of registers required for each */
4105 /* and serially allocate registers */
4106 serialRegAssign (ebbs, count);
4108 /* if stack was extended then tell the user */
4111 /* werror(W_TOOMANY_SPILS,"stack", */
4112 /* _G.stackExtend,currFunc->name,""); */
4118 /* werror(W_TOOMANY_SPILS,"data space", */
4119 /* _G.dataExtend,currFunc->name,""); */
4123 /* after that create the register mask
4124 for each of the instruction */
4125 createRegMask (ebbs, count);
4127 /* redo that offsets for stacked automatic variables */
4128 redoStackOffsets ();
4130 if (options.dump_rassgn)
4131 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4133 /* now get back the chain */
4134 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4136 debugLog ("ebbs after optimizing:\n");
4137 dumpEbbsToDebug (ebbs, count);
4142 /* free up any _G.stackSpil locations allocated */
4143 applyToSet (_G.stackSpil, deallocStackSpil);
4145 setToNull ((void *) &_G.stackSpil);
4146 setToNull ((void *) &_G.spiltSet);
4147 /* mark all registers as free */
4148 //pic14_freeAllRegs ();
4150 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");