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->liveFrom == ic->seq && /* does not start before here */ 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 the live range preceeds the point of definition
2324 then ideally we must take into account registers that
2325 have been allocated after sym->liveFrom but freed
2326 before ic->seq. This is complicated, so spill this
2327 symbol instead and let fillGaps handle the allocation. */
2328 if (sym->liveFrom < ic->seq)
2334 /* if it has a spillocation & is used less than
2335 all other live ranges then spill this */
2337 if (sym->usl.spillLoc) {
2338 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2339 allLRs, ebbs[i], ic));
2340 if (leastUsed && leastUsed->used > sym->used) {
2345 /* if none of the liveRanges have a spillLocation then better
2346 to spill this one than anything else already assigned to registers */
2347 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2348 /* if this is local to this block then we might find a block spil */
2349 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2357 if (ic->op == RECEIVE)
2358 debugLog ("When I get clever, I'll optimize the receive logic\n");
2360 /* if we need ptr regs for the right side
2362 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2363 <= (unsigned) PTRSIZE)
2368 /* else we assign registers to it */
2369 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2371 debugLog (" %d - \n", __LINE__);
2373 bitVectDebugOn(_G.regAssigned, debugF);
2374 for (j = 0; j < sym->nRegs; j++)
2376 if (sym->regType == REG_PTR)
2377 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2379 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2381 /* if the allocation failed which means
2382 this was spilt then break */
2386 debugLog (" %d - \n", __LINE__);
2388 /* if it shares registers with operands make sure
2389 that they are in the same position */
2390 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2391 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2392 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2393 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2394 /* do the same for the right operand */
2395 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2396 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2397 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2398 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2400 debugLog (" %d - \n", __LINE__);
2403 debugLog (" %d - \n", __LINE__);
2412 /* Check for and fix any problems with uninitialized operands */
2413 for (i = 0; i < count; i++)
2417 if (ebbs[i]->noPath &&
2418 (ebbs[i]->entryLabel != entryLabel &&
2419 ebbs[i]->entryLabel != returnLabel))
2422 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2429 verifyRegsAssigned (IC_COND (ic), ic);
2433 if (ic->op == JUMPTABLE)
2435 verifyRegsAssigned (IC_JTCOND (ic), ic);
2439 verifyRegsAssigned (IC_RESULT (ic), ic);
2440 verifyRegsAssigned (IC_LEFT (ic), ic);
2441 verifyRegsAssigned (IC_RIGHT (ic), ic);
2447 /*-----------------------------------------------------------------*/
2448 /* rUmaskForOp :- returns register mask for an operand */
2449 /*-----------------------------------------------------------------*/
2451 rUmaskForOp (operand * op)
2457 debugLog ("%s\n", __FUNCTION__);
2458 /* only temporaries are assigned registers */
2462 sym = OP_SYMBOL (op);
2464 /* if spilt or no registers assigned to it
2466 if (sym->isspilt || !sym->nRegs)
2469 rumask = newBitVect (pic14_nRegs);
2471 for (j = 0; j < sym->nRegs; j++)
2473 rumask = bitVectSetBit (rumask,
2474 sym->regs[j]->rIdx);
2480 /*-----------------------------------------------------------------*/
2481 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2482 /*-----------------------------------------------------------------*/
2484 regsUsedIniCode (iCode * ic)
2486 bitVect *rmask = newBitVect (pic14_nRegs);
2488 debugLog ("%s\n", __FUNCTION__);
2489 /* do the special cases first */
2492 rmask = bitVectUnion (rmask,
2493 rUmaskForOp (IC_COND (ic)));
2497 /* for the jumptable */
2498 if (ic->op == JUMPTABLE)
2500 rmask = bitVectUnion (rmask,
2501 rUmaskForOp (IC_JTCOND (ic)));
2506 /* of all other cases */
2508 rmask = bitVectUnion (rmask,
2509 rUmaskForOp (IC_LEFT (ic)));
2513 rmask = bitVectUnion (rmask,
2514 rUmaskForOp (IC_RIGHT (ic)));
2517 rmask = bitVectUnion (rmask,
2518 rUmaskForOp (IC_RESULT (ic)));
2524 /*-----------------------------------------------------------------*/
2525 /* createRegMask - for each instruction will determine the regsUsed */
2526 /*-----------------------------------------------------------------*/
2528 createRegMask (eBBlock ** ebbs, int count)
2532 debugLog ("%s\n", __FUNCTION__);
2533 /* for all blocks */
2534 for (i = 0; i < count; i++)
2538 if (ebbs[i]->noPath &&
2539 (ebbs[i]->entryLabel != entryLabel &&
2540 ebbs[i]->entryLabel != returnLabel))
2543 /* for all instructions */
2544 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2549 if (SKIP_IC2 (ic) || !ic->rlive)
2552 /* first mark the registers used in this
2554 ic->rUsed = regsUsedIniCode (ic);
2555 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2557 /* now create the register mask for those
2558 registers that are in use : this is a
2559 super set of ic->rUsed */
2560 ic->rMask = newBitVect (pic14_nRegs + 1);
2562 /* for all live Ranges alive at this point */
2563 for (j = 1; j < ic->rlive->size; j++)
2568 /* if not alive then continue */
2569 if (!bitVectBitValue (ic->rlive, j))
2572 /* find the live range we are interested in */
2573 if (!(sym = hTabItemWithKey (liveRanges, j)))
2575 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2576 "createRegMask cannot find live range");
2580 /* if no register assigned to it */
2581 if (!sym->nRegs || sym->isspilt)
2584 /* for all the registers allocated to it */
2585 for (k = 0; k < sym->nRegs; k++)
2588 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2594 /*-----------------------------------------------------------------*/
2595 /* rematStr - returns the rematerialized string for a remat var */
2596 /*-----------------------------------------------------------------*/
2598 rematStr (symbol * sym)
2601 iCode *ic = sym->rematiCode;
2602 symbol *psym = NULL;
2604 debugLog ("%s\n", __FUNCTION__);
2606 //printf ("%s\n", s);
2608 /* if plus or minus print the right hand side */
2610 if (ic->op == '+' || ic->op == '-') {
2612 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2614 sprintf (s, "(%s %c 0x%04x)",
2615 OP_SYMBOL (IC_LEFT (ric))->rname,
2617 (int) operandLitValue (IC_RIGHT (ic)));
2620 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2622 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2623 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2628 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2629 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2631 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2636 /*-----------------------------------------------------------------*/
2637 /* rematStr - returns the rematerialized string for a remat var */
2638 /*-----------------------------------------------------------------*/
2640 rematStr (symbol * sym)
2643 iCode *ic = sym->rematiCode;
2645 debugLog ("%s\n", __FUNCTION__);
2650 /* if plus or minus print the right hand side */
2652 if (ic->op == '+' || ic->op == '-') {
2653 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2656 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2660 if (ic->op == '+' || ic->op == '-')
2662 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2663 sprintf (s, "(%s %c 0x%04x)",
2664 OP_SYMBOL (IC_LEFT (ric))->rname,
2666 (int) operandLitValue (IC_RIGHT (ic)));
2669 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2671 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2675 /* we reached the end */
2676 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2680 printf ("%s\n", buffer);
2685 /*-----------------------------------------------------------------*/
2686 /* regTypeNum - computes the type & number of registers required */
2687 /*-----------------------------------------------------------------*/
2695 debugLog ("%s\n", __FUNCTION__);
2696 /* for each live range do */
2697 for (sym = hTabFirstItem (liveRanges, &k); sym;
2698 sym = hTabNextItem (liveRanges, &k)) {
2700 debugLog (" %d - %s\n", __LINE__, sym->rname);
2702 /* if used zero times then no registers needed */
2703 if ((sym->liveTo - sym->liveFrom) == 0)
2707 /* if the live range is a temporary */
2710 debugLog (" %d - itemp register\n", __LINE__);
2712 /* if the type is marked as a conditional */
2713 if (sym->regType == REG_CND)
2716 /* if used in return only then we don't
2719 if (IS_AGGREGATE (sym->type) || sym->isptr)
2720 sym->type = aggrToPtr (sym->type, FALSE);
2721 debugLog (" %d - no reg needed - accumulator used\n", __LINE__);
2727 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2728 // sym->type = aggrToPtr (sym->type, FALSE);
2729 debugLog (" %d - used as a return\n", __LINE__);
2734 /* if the symbol has only one definition &
2735 that definition is a get_pointer and the
2736 pointer we are getting is rematerializable and
2739 if (bitVectnBitsOn (sym->defs) == 1 &&
2740 (ic = hTabItemWithKey (iCodehTab,
2741 bitVectFirstBit (sym->defs))) &&
2743 !IS_BITVAR (sym->etype) &&
2744 (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER)) {
2746 if (ptrPseudoSymSafe (sym, ic)) {
2750 debugLog (" %d - \n", __LINE__);
2752 /* create a psuedo symbol & force a spil */
2753 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2754 psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2755 psym->type = sym->type;
2756 psym->etype = sym->etype;
2757 psym->psbase = ptrBaseRematSym (OP_SYMBOL (IC_LEFT (ic)));
2758 strcpy (psym->rname, psym->name);
2760 sym->usl.spillLoc = psym;
2764 /* if in data space or idata space then try to
2765 allocate pointer register */
2769 /* if not then we require registers */
2770 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2771 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2772 getSize (sym->type));
2775 if(IS_PTR_CONST (sym->type)) {
2776 debugLog (" %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2780 if (sym->nRegs > 4) {
2781 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2782 printTypeChain (sym->type, stderr);
2783 fprintf (stderr, "\n");
2786 /* determine the type of register required */
2787 if (sym->nRegs == 1 &&
2788 IS_PTR (sym->type) &&
2790 sym->regType = REG_PTR;
2792 sym->regType = REG_GPR;
2795 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2799 /* for the first run we don't provide */
2800 /* registers for true symbols we will */
2801 /* see how things go */
2806 DEFSETFUNC (markRegFree)
2808 ((regs *)item)->isFree = 1;
2813 DEFSETFUNC (deallocReg)
2815 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2816 ((regs *)item)->isFree = 1;
2817 ((regs *)item)->wasUsed = 0;
2821 /*-----------------------------------------------------------------*/
2822 /* freeAllRegs - mark all registers as free */
2823 /*-----------------------------------------------------------------*/
2825 pic14_freeAllRegs ()
2829 debugLog ("%s\n", __FUNCTION__);
2831 applyToSet(dynAllocRegs,markRegFree);
2832 applyToSet(dynStackRegs,markRegFree);
2835 for (i = 0; i < pic14_nRegs; i++)
2836 regspic14[i].isFree = 1;
2840 /*-----------------------------------------------------------------*/
2841 /*-----------------------------------------------------------------*/
2843 pic14_deallocateAllRegs ()
2847 debugLog ("%s\n", __FUNCTION__);
2849 applyToSet(dynAllocRegs,deallocReg);
2852 for (i = 0; i < pic14_nRegs; i++) {
2853 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2854 regspic14[i].isFree = 1;
2855 regspic14[i].wasUsed = 0;
2862 /*-----------------------------------------------------------------*/
2863 /* deallocStackSpil - this will set the stack pointer back */
2864 /*-----------------------------------------------------------------*/
2866 DEFSETFUNC (deallocStackSpil)
2870 debugLog ("%s\n", __FUNCTION__);
2875 /*-----------------------------------------------------------------*/
2876 /* farSpacePackable - returns the packable icode for far variables */
2877 /*-----------------------------------------------------------------*/
2879 farSpacePackable (iCode * ic)
2883 debugLog ("%s\n", __FUNCTION__);
2884 /* go thru till we find a definition for the
2885 symbol on the right */
2886 for (dic = ic->prev; dic; dic = dic->prev)
2889 /* if the definition is a call then no */
2890 if ((dic->op == CALL || dic->op == PCALL) &&
2891 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2896 /* if shift by unknown amount then not */
2897 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2898 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2901 /* if pointer get and size > 1 */
2902 if (POINTER_GET (dic) &&
2903 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2906 if (POINTER_SET (dic) &&
2907 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2910 /* if any three is a true symbol in far space */
2911 if (IC_RESULT (dic) &&
2912 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2913 isOperandInFarSpace (IC_RESULT (dic)))
2916 if (IC_RIGHT (dic) &&
2917 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2918 isOperandInFarSpace (IC_RIGHT (dic)) &&
2919 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2922 if (IC_LEFT (dic) &&
2923 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2924 isOperandInFarSpace (IC_LEFT (dic)) &&
2925 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2928 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2930 if ((dic->op == LEFT_OP ||
2931 dic->op == RIGHT_OP ||
2933 IS_OP_LITERAL (IC_RIGHT (dic)))
2943 /*-----------------------------------------------------------------*/
2944 /* packRegsForAssign - register reduction for assignment */
2945 /*-----------------------------------------------------------------*/
2947 packRegsForAssign (iCode * ic, eBBlock * ebp)
2952 debugLog ("%s\n", __FUNCTION__);
2954 debugAopGet (" result:", IC_RESULT (ic));
2955 debugAopGet (" left:", IC_LEFT (ic));
2956 debugAopGet (" right:", IC_RIGHT (ic));
2958 /* if this is at an absolute address, then get the address. */
2959 if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2960 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2961 debugLog (" %d - found config word declaration\n", __LINE__);
2962 if(IS_VALOP(IC_RIGHT(ic))) {
2963 debugLog (" setting config word to %x\n",
2964 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2965 assignConfigWordValue( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2966 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2969 /* remove the assignment from the iCode chain. */
2971 remiCodeFromeBBlock (ebp, ic);
2972 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2973 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2980 if (!IS_ITEMP (IC_RESULT (ic))) {
2981 allocDirReg(IC_RESULT (ic));
2982 debugLog (" %d - result is not temp\n", __LINE__);
2985 if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2986 debugLog (" %d - left is not temp, allocating\n", __LINE__);
2987 allocDirReg(IC_LEFT (ic));
2991 if (!IS_ITEMP (IC_RIGHT (ic))) {
2992 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2994 /* only pack if this is not a function pointer */
2995 if (!IS_REF (IC_RIGHT (ic)))
2996 allocDirReg(IC_RIGHT (ic));
3000 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
3001 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
3003 debugLog (" %d - not packing - right side fails \n", __LINE__);
3007 /* if the true symbol is defined in far space or on stack
3008 then we should not since this will increase register pressure */
3009 if (isOperandInFarSpace (IC_RESULT (ic)))
3011 if ((dic = farSpacePackable (ic)))
3017 /* find the definition of iTempNN scanning backwards if we find a
3018 a use of the true symbol before we find the definition then
3020 for (dic = ic->prev; dic; dic = dic->prev)
3023 /* if there is a function call and this is
3024 a parameter & not my parameter then don't pack it */
3025 if ((dic->op == CALL || dic->op == PCALL) &&
3026 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
3027 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
3029 debugLog (" %d - \n", __LINE__);
3037 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3038 IS_OP_VOLATILE (IC_RESULT (dic)))
3040 debugLog (" %d - dic is VOLATILE \n", __LINE__);
3045 if (IS_SYMOP (IC_RESULT (dic)) &&
3046 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3048 /* A previous result was assigned to the same register - we'll our definition */
3049 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
3050 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3051 if (POINTER_SET (dic))
3057 if (IS_SYMOP (IC_RIGHT (dic)) &&
3058 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3059 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3061 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
3066 if (IS_SYMOP (IC_LEFT (dic)) &&
3067 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3068 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3070 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
3075 if (POINTER_SET (dic) &&
3076 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3078 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
3086 return 0; /* did not find */
3088 /* if the result is on stack or iaccess then it must be
3089 the same atleast one of the operands */
3090 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3091 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3094 /* the operation has only one symbol
3095 operator then we can pack */
3096 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3097 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3100 if (!((IC_LEFT (dic) &&
3101 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3103 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3107 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3108 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3109 /* found the definition */
3110 /* replace the result with the result of */
3111 /* this assignment and remove this assignment */
3112 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3113 IC_RESULT (dic) = IC_RESULT (ic);
3115 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3117 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3119 /* delete from liverange table also
3120 delete from all the points inbetween and the new
3122 for (sic = dic; sic != ic; sic = sic->next)
3124 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3125 if (IS_ITEMP (IC_RESULT (dic)))
3126 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3129 remiCodeFromeBBlock (ebp, ic);
3130 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3131 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3132 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3138 /*-----------------------------------------------------------------*/
3139 /* findAssignToSym : scanning backwards looks for first assig found */
3140 /*-----------------------------------------------------------------*/
3142 findAssignToSym (operand * op, iCode * ic)
3146 debugLog ("%s\n", __FUNCTION__);
3147 for (dic = ic->prev; dic; dic = dic->prev)
3150 /* if definition by assignment */
3151 if (dic->op == '=' &&
3152 !POINTER_SET (dic) &&
3153 IC_RESULT (dic)->key == op->key
3154 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3158 /* we are interested only if defined in far space */
3159 /* or in stack space in case of + & - */
3161 /* if assigned to a non-symbol then return
3163 if (!IS_SYMOP (IC_RIGHT (dic)))
3166 /* if the symbol is in far space then
3168 if (isOperandInFarSpace (IC_RIGHT (dic)))
3171 /* for + & - operations make sure that
3172 if it is on the stack it is the same
3173 as one of the three operands */
3174 if ((ic->op == '+' || ic->op == '-') &&
3175 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3178 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3179 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3180 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3188 /* if we find an usage then we cannot delete it */
3189 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3192 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3195 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3199 /* now make sure that the right side of dic
3200 is not defined between ic & dic */
3203 iCode *sic = dic->next;
3205 for (; sic != ic; sic = sic->next)
3206 if (IC_RESULT (sic) &&
3207 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3216 /*-----------------------------------------------------------------*/
3217 /* packRegsForSupport :- reduce some registers for support calls */
3218 /*-----------------------------------------------------------------*/
3220 packRegsForSupport (iCode * ic, eBBlock * ebp)
3224 debugLog ("%s\n", __FUNCTION__);
3225 /* for the left & right operand :- look to see if the
3226 left was assigned a true symbol in far space in that
3227 case replace them */
3228 if (IS_ITEMP (IC_LEFT (ic)) &&
3229 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3231 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3237 debugAopGet ("removing left:", IC_LEFT (ic));
3239 /* found it we need to remove it from the
3241 for (sic = dic; sic != ic; sic = sic->next)
3242 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3244 IC_LEFT (ic)->operand.symOperand =
3245 IC_RIGHT (dic)->operand.symOperand;
3246 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3247 remiCodeFromeBBlock (ebp, dic);
3248 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3249 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3253 /* do the same for the right operand */
3256 IS_ITEMP (IC_RIGHT (ic)) &&
3257 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3259 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3265 /* if this is a subtraction & the result
3266 is a true symbol in far space then don't pack */
3267 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3269 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3270 if (IN_FARSPACE (SPEC_OCLS (etype)))
3274 debugAopGet ("removing right:", IC_RIGHT (ic));
3276 /* found it we need to remove it from the
3278 for (sic = dic; sic != ic; sic = sic->next)
3279 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3281 IC_RIGHT (ic)->operand.symOperand =
3282 IC_RIGHT (dic)->operand.symOperand;
3283 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3285 remiCodeFromeBBlock (ebp, dic);
3286 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3287 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3294 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3297 /*-----------------------------------------------------------------*/
3298 /* packRegsForOneuse : - will reduce some registers for single Use */
3299 /*-----------------------------------------------------------------*/
3301 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3306 debugLog ("%s\n", __FUNCTION__);
3307 /* if returning a literal then do nothing */
3311 /* only upto 2 bytes since we cannot predict
3312 the usage of b, & acc */
3313 if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3318 /* this routine will mark the a symbol as used in one
3319 instruction use only && if the definition is local
3320 (ie. within the basic block) && has only one definition &&
3321 that definition is either a return value from a
3322 function or does not contain any variables in
3324 uses = bitVectCopy (OP_USES (op));
3325 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3326 if (!bitVectIsZero (uses)) /* has other uses */
3329 /* if it has only one defintion */
3330 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3331 return NULL; /* has more than one definition */
3333 /* get that definition */
3335 hTabItemWithKey (iCodehTab,
3336 bitVectFirstBit (OP_DEFS (op)))))
3339 /* found the definition now check if it is local */
3340 if (dic->seq < ebp->fSeq ||
3341 dic->seq > ebp->lSeq)
3342 return NULL; /* non-local */
3344 /* now check if it is the return from
3346 if (dic->op == CALL || dic->op == PCALL)
3348 if (ic->op != SEND && ic->op != RETURN &&
3349 !POINTER_SET(ic) && !POINTER_GET(ic))
3351 OP_SYMBOL (op)->ruonly = 1;
3358 /* otherwise check that the definition does
3359 not contain any symbols in far space */
3360 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3361 isOperandInFarSpace (IC_RIGHT (dic)) ||
3362 IS_OP_RUONLY (IC_LEFT (ic)) ||
3363 IS_OP_RUONLY (IC_RIGHT (ic)))
3368 /* if pointer set then make sure the pointer
3370 if (POINTER_SET (dic) &&
3371 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3374 if (POINTER_GET (dic) &&
3375 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3380 /* also make sure the intervenening instructions
3381 don't have any thing in far space */
3382 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3385 /* if there is an intervening function call then no */
3386 if (dic->op == CALL || dic->op == PCALL)
3388 /* if pointer set then make sure the pointer
3390 if (POINTER_SET (dic) &&
3391 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3394 if (POINTER_GET (dic) &&
3395 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3398 /* if address of & the result is remat then okay */
3399 if (dic->op == ADDRESS_OF &&
3400 OP_SYMBOL (IC_RESULT (dic))->remat)
3403 /* if operand has size of three or more & this
3404 operation is a '*','/' or '%' then 'b' may
3406 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3407 getSize (operandType (op)) >= 3)
3410 /* if left or right or result is in far space */
3411 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3412 isOperandInFarSpace (IC_RIGHT (dic)) ||
3413 isOperandInFarSpace (IC_RESULT (dic)) ||
3414 IS_OP_RUONLY (IC_LEFT (dic)) ||
3415 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3416 IS_OP_RUONLY (IC_RESULT (dic)))
3422 OP_SYMBOL (op)->ruonly = 1;
3427 /*-----------------------------------------------------------------*/
3428 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3429 /*-----------------------------------------------------------------*/
3431 isBitwiseOptimizable (iCode * ic)
3433 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3434 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3436 debugLog ("%s\n", __FUNCTION__);
3437 /* bitwise operations are considered optimizable
3438 under the following conditions (Jean-Louis VERN)
3450 if (IS_LITERAL (rtype) ||
3451 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3457 /*-----------------------------------------------------------------*/
3458 /* packRegsForAccUse - pack registers for acc use */
3459 /*-----------------------------------------------------------------*/
3461 packRegsForAccUse (iCode * ic)
3465 debugLog ("%s\n", __FUNCTION__);
3467 /* if this is an aggregate, e.g. a one byte char array */
3468 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3471 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3473 /* if + or - then it has to be one byte result */
3474 if ((ic->op == '+' || ic->op == '-')
3475 && getSize (operandType (IC_RESULT (ic))) > 1)
3478 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3479 /* if shift operation make sure right side is not a literal */
3480 if (ic->op == RIGHT_OP &&
3481 (isOperandLiteral (IC_RIGHT (ic)) ||
3482 getSize (operandType (IC_RESULT (ic))) > 1))
3485 if (ic->op == LEFT_OP &&
3486 (isOperandLiteral (IC_RIGHT (ic)) ||
3487 getSize (operandType (IC_RESULT (ic))) > 1))
3490 if (IS_BITWISE_OP (ic) &&
3491 getSize (operandType (IC_RESULT (ic))) > 1)
3495 /* has only one definition */
3496 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3499 /* has only one use */
3500 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3503 /* and the usage immediately follows this iCode */
3504 if (!(uic = hTabItemWithKey (iCodehTab,
3505 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3508 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3509 if (ic->next != uic)
3512 /* if it is a conditional branch then we definitely can */
3516 if (uic->op == JUMPTABLE)
3519 /* if the usage is not is an assignment
3520 or an arithmetic / bitwise / shift operation then not */
3521 if (POINTER_SET (uic) &&
3522 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3525 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3526 if (uic->op != '=' &&
3527 !IS_ARITHMETIC_OP (uic) &&
3528 !IS_BITWISE_OP (uic) &&
3529 uic->op != LEFT_OP &&
3530 uic->op != RIGHT_OP)
3533 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3534 /* if used in ^ operation then make sure right is not a
3536 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3539 /* if shift operation make sure right side is not a literal */
3540 if (uic->op == RIGHT_OP &&
3541 (isOperandLiteral (IC_RIGHT (uic)) ||
3542 getSize (operandType (IC_RESULT (uic))) > 1))
3545 if (uic->op == LEFT_OP &&
3546 (isOperandLiteral (IC_RIGHT (uic)) ||
3547 getSize (operandType (IC_RESULT (uic))) > 1))
3550 /* make sure that the result of this icode is not on the
3551 stack, since acc is used to compute stack offset */
3552 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3553 OP_SYMBOL (IC_RESULT (uic))->onStack)
3556 /* if either one of them in far space then we cannot */
3557 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3558 isOperandInFarSpace (IC_LEFT (uic))) ||
3559 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3560 isOperandInFarSpace (IC_RIGHT (uic))))
3563 /* if the usage has only one operand then we can */
3564 if (IC_LEFT (uic) == NULL ||
3565 IC_RIGHT (uic) == NULL)
3568 /* make sure this is on the left side if not
3569 a '+' since '+' is commutative */
3570 if (ic->op != '+' &&
3571 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3574 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3575 /* if one of them is a literal then we can */
3576 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3577 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3578 (getSize (operandType (IC_RESULT (uic))) <= 1))
3580 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3584 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3585 /* if the other one is not on stack then we can */
3586 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3587 (IS_ITEMP (IC_RIGHT (uic)) ||
3588 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3589 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3592 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3593 (IS_ITEMP (IC_LEFT (uic)) ||
3594 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3595 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3601 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3602 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3607 /*-----------------------------------------------------------------*/
3608 /* packForPush - hueristics to reduce iCode for pushing */
3609 /*-----------------------------------------------------------------*/
3611 packForReceive (iCode * ic, eBBlock * ebp)
3615 debugLog ("%s\n", __FUNCTION__);
3616 debugAopGet (" result:", IC_RESULT (ic));
3617 debugAopGet (" left:", IC_LEFT (ic));
3618 debugAopGet (" right:", IC_RIGHT (ic));
3623 for (dic = ic->next; dic; dic = dic->next)
3628 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3629 debugLog (" used on left\n");
3630 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3631 debugLog (" used on right\n");
3632 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3633 debugLog (" used on result\n");
3635 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3636 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3641 debugLog (" hey we can remove this unnecessary assign\n");
3643 /*-----------------------------------------------------------------*/
3644 /* packForPush - hueristics to reduce iCode for pushing */
3645 /*-----------------------------------------------------------------*/
3647 packForPush (iCode * ic, eBBlock * ebp)
3651 debugLog ("%s\n", __FUNCTION__);
3652 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3655 /* must have only definition & one usage */
3656 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3657 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3660 /* find the definition */
3661 if (!(dic = hTabItemWithKey (iCodehTab,
3662 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3665 if (dic->op != '=' || POINTER_SET (dic))
3668 /* we now we know that it has one & only one def & use
3669 and the that the definition is an assignment */
3670 IC_LEFT (ic) = IC_RIGHT (dic);
3672 remiCodeFromeBBlock (ebp, dic);
3673 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3674 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3677 void printSymType(char * str, sym_link *sl)
3679 debugLog (" %s Symbol type: ",str);
3680 printTypeChain( sl, debugF);
3685 /*-----------------------------------------------------------------*/
3686 /* some debug code to print the symbol S_TYPE. Note that
3687 * the function checkSClass in src/SDCCsymt.c dinks with
3688 * the S_TYPE in ways the PIC port doesn't fully like...*/
3689 /*-----------------------------------------------------------------*/
3690 void isData(sym_link *sl)
3700 for ( ; sl; sl=sl->next) {
3702 switch (SPEC_SCLS(sl)) {
3704 case S_DATA: fprintf (of, "data "); break;
3705 case S_XDATA: fprintf (of, "xdata "); break;
3706 case S_SFR: fprintf (of, "sfr "); break;
3707 case S_SBIT: fprintf (of, "sbit "); break;
3708 case S_CODE: fprintf (of, "code "); break;
3709 case S_IDATA: fprintf (of, "idata "); break;
3710 case S_PDATA: fprintf (of, "pdata "); break;
3711 case S_LITERAL: fprintf (of, "literal "); break;
3712 case S_STACK: fprintf (of, "stack "); break;
3713 case S_XSTACK: fprintf (of, "xstack "); break;
3714 case S_BIT: fprintf (of, "bit "); break;
3715 case S_EEPROM: fprintf (of, "eeprom "); break;
3724 /*-----------------------------------------------------------------*/
3725 /* packRegisters - does some transformations to reduce register */
3727 /*-----------------------------------------------------------------*/
3729 packRegisters (eBBlock * ebp)
3734 debugLog ("%s\n", __FUNCTION__);
3740 /* look for assignments of the form */
3741 /* iTempNN = TRueSym (someoperation) SomeOperand */
3743 /* TrueSym := iTempNN:1 */
3744 for (ic = ebp->sch; ic; ic = ic->next)
3747 /* find assignment of the form TrueSym := iTempNN:1 */
3748 if (ic->op == '=' && !POINTER_SET (ic))
3749 change += packRegsForAssign (ic, ebp);
3753 if (POINTER_SET (ic))
3754 debugLog ("pointer is set\n");
3755 debugAopGet (" result:", IC_RESULT (ic));
3756 debugAopGet (" left:", IC_LEFT (ic));
3757 debugAopGet (" right:", IC_RIGHT (ic));
3766 for (ic = ebp->sch; ic; ic = ic->next) {
3768 if(IS_SYMOP ( IC_LEFT(ic))) {
3769 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3771 debugAopGet (" left:", IC_LEFT (ic));
3772 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3773 debugLog (" is a pointer\n");
3775 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3776 debugLog (" is volatile\n");
3780 printSymType(" ", OP_SYMBOL(IC_LEFT(ic))->type);
3783 if(IS_SYMOP ( IC_RIGHT(ic))) {
3784 debugAopGet (" right:", IC_RIGHT (ic));
3785 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3788 if(IS_SYMOP ( IC_RESULT(ic))) {
3789 debugAopGet (" result:", IC_RESULT (ic));
3790 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3793 if (POINTER_SET (ic))
3794 debugLog (" %d - Pointer set\n", __LINE__);
3797 /* if this is an itemp & result of a address of a true sym
3798 then mark this as rematerialisable */
3799 if (ic->op == ADDRESS_OF &&
3800 IS_ITEMP (IC_RESULT (ic)) &&
3801 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3802 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3803 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3806 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3808 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3809 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3810 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3814 /* if straight assignment then carry remat flag if
3815 this is the only definition */
3816 if (ic->op == '=' &&
3817 !POINTER_SET (ic) &&
3818 IS_SYMOP (IC_RIGHT (ic)) &&
3819 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3820 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3822 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3824 OP_SYMBOL (IC_RESULT (ic))->remat =
3825 OP_SYMBOL (IC_RIGHT (ic))->remat;
3826 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3827 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3830 /* if this is a +/- operation with a rematerizable
3831 then mark this as rematerializable as well */
3832 if ((ic->op == '+' || ic->op == '-') &&
3833 (IS_SYMOP (IC_LEFT (ic)) &&
3834 IS_ITEMP (IC_RESULT (ic)) &&
3835 OP_SYMBOL (IC_LEFT (ic))->remat &&
3836 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3837 IS_OP_LITERAL (IC_RIGHT (ic))))
3839 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3841 operandLitValue (IC_RIGHT (ic));
3842 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3843 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3844 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3847 /* mark the pointer usages */
3848 if (POINTER_SET (ic))
3850 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3851 debugLog (" marking as a pointer (set) =>");
3852 debugAopGet (" result:", IC_RESULT (ic));
3854 if (POINTER_GET (ic))
3856 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3857 debugLog (" marking as a pointer (get) =>");
3858 debugAopGet (" left:", IC_LEFT (ic));
3863 /* if we are using a symbol on the stack
3864 then we should say pic14_ptrRegReq */
3865 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3866 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3867 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3868 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3869 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3870 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3873 if (IS_SYMOP (IC_LEFT (ic)))
3874 pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3875 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3876 if (IS_SYMOP (IC_RIGHT (ic)))
3877 pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3878 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3879 if (IS_SYMOP (IC_RESULT (ic)))
3880 pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3881 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3884 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3888 /* if the condition of an if instruction
3889 is defined in the previous instruction then
3890 mark the itemp as a conditional */
3891 if ((IS_CONDITIONAL (ic) ||
3892 ((ic->op == BITWISEAND ||
3895 isBitwiseOptimizable (ic))) &&
3896 ic->next && ic->next->op == IFX &&
3897 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3898 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3901 debugLog (" %d\n", __LINE__);
3902 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3906 /* reduce for support function calls */
3907 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3908 packRegsForSupport (ic, ebp);
3910 /* if a parameter is passed, it's in W, so we may not
3911 need to place a copy in a register */
3912 if (ic->op == RECEIVE)
3913 packForReceive (ic, ebp);
3915 /* some cases the redundant moves can
3916 can be eliminated for return statements */
3917 if ((ic->op == RETURN || ic->op == SEND) &&
3918 !isOperandInFarSpace (IC_LEFT (ic)) &&
3920 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3922 /* if pointer set & left has a size more than
3923 one and right is not in far space */
3924 if (POINTER_SET (ic) &&
3925 !isOperandInFarSpace (IC_RIGHT (ic)) &&
3926 !OP_SYMBOL (IC_RESULT (ic))->remat &&
3927 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3928 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3930 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3932 /* if pointer get */
3933 if (POINTER_GET (ic) &&
3934 !isOperandInFarSpace (IC_RESULT (ic)) &&
3935 !OP_SYMBOL (IC_LEFT (ic))->remat &&
3936 !IS_OP_RUONLY (IC_RESULT (ic)) &&
3937 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3939 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3942 /* if this is cast for intergral promotion then
3943 check if only use of the definition of the
3944 operand being casted/ if yes then replace
3945 the result of that arithmetic operation with
3946 this result and get rid of the cast */
3947 if (ic->op == CAST) {
3949 sym_link *fromType = operandType (IC_RIGHT (ic));
3950 sym_link *toType = operandType (IC_LEFT (ic));
3952 debugLog (" %d - casting\n", __LINE__);
3954 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3955 getSize (fromType) != getSize (toType)) {
3958 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3961 if (IS_ARITHMETIC_OP (dic)) {
3963 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3964 IC_RESULT (dic) = IC_RESULT (ic);
3965 remiCodeFromeBBlock (ebp, ic);
3966 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3967 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3968 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3972 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3976 /* if the type from and type to are the same
3977 then if this is the only use then packit */
3978 if (compareType (operandType (IC_RIGHT (ic)),
3979 operandType (IC_LEFT (ic))) == 1) {
3981 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3984 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3985 IC_RESULT (dic) = IC_RESULT (ic);
3986 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3987 remiCodeFromeBBlock (ebp, ic);
3988 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3989 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3997 iTempNN := (some variable in farspace) V1
4002 if (ic->op == IPUSH)
4004 packForPush (ic, ebp);
4008 /* pack registers for accumulator use, when the
4009 result of an arithmetic or bit wise operation
4010 has only one use, that use is immediately following
4011 the defintion and the using iCode has only one
4012 operand or has two operands but one is literal &
4013 the result of that operation is not on stack then
4014 we can leave the result of this operation in acc:b
4016 if ((IS_ARITHMETIC_OP (ic)
4018 || IS_BITWISE_OP (ic)
4020 || ic->op == LEFT_OP || ic->op == RIGHT_OP
4023 IS_ITEMP (IC_RESULT (ic)) &&
4024 getSize (operandType (IC_RESULT (ic))) <= 2)
4026 packRegsForAccUse (ic);
4032 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4036 if (!debug || !debugF)
4039 for (i = 0; i < count; i++)
4041 fprintf (debugF, "\n----------------------------------------------------------------\n");
4042 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4043 ebbs[i]->entryLabel->name,
4046 ebbs[i]->isLastInLoop);
4047 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4052 fprintf (debugF, "visited %d : hasFcall = %d\n",
4056 fprintf (debugF, "\ndefines bitVector :");
4057 bitVectDebugOn (ebbs[i]->defSet, debugF);
4058 fprintf (debugF, "\nlocal defines bitVector :");
4059 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4060 fprintf (debugF, "\npointers Set bitvector :");
4061 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4062 fprintf (debugF, "\nin pointers Set bitvector :");
4063 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4064 fprintf (debugF, "\ninDefs Set bitvector :");
4065 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4066 fprintf (debugF, "\noutDefs Set bitvector :");
4067 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4068 fprintf (debugF, "\nusesDefs Set bitvector :");
4069 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4070 fprintf (debugF, "\n----------------------------------------------------------------\n");
4071 printiCChain (ebbs[i]->sch, debugF);
4074 /*-----------------------------------------------------------------*/
4075 /* assignRegisters - assigns registers to each live range as need */
4076 /*-----------------------------------------------------------------*/
4078 pic14_assignRegisters (eBBlock ** ebbs, int count)
4083 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4084 debugLog ("\nebbs before optimizing:\n");
4085 dumpEbbsToDebug (ebbs, count);
4087 setToNull ((void *) &_G.funcrUsed);
4088 pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4091 /* change assignments this will remove some
4092 live ranges reducing some register pressure */
4093 for (i = 0; i < count; i++)
4094 packRegisters (ebbs[i]);
4101 debugLog("dir registers allocated so far:\n");
4102 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4105 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4106 reg = hTabNextItem(dynDirectRegNames, &hkey);
4111 if (options.dump_pack)
4112 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4114 /* first determine for each live range the number of
4115 registers & the type of registers required for each */
4118 /* and serially allocate registers */
4119 serialRegAssign (ebbs, count);
4121 /* if stack was extended then tell the user */
4124 /* werror(W_TOOMANY_SPILS,"stack", */
4125 /* _G.stackExtend,currFunc->name,""); */
4131 /* werror(W_TOOMANY_SPILS,"data space", */
4132 /* _G.dataExtend,currFunc->name,""); */
4136 /* after that create the register mask
4137 for each of the instruction */
4138 createRegMask (ebbs, count);
4140 /* redo that offsets for stacked automatic variables */
4141 redoStackOffsets ();
4143 if (options.dump_rassgn)
4144 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4146 /* now get back the chain */
4147 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4149 debugLog ("ebbs after optimizing:\n");
4150 dumpEbbsToDebug (ebbs, count);
4155 /* free up any _G.stackSpil locations allocated */
4156 applyToSet (_G.stackSpil, deallocStackSpil);
4158 setToNull ((void *) &_G.stackSpil);
4159 setToNull ((void *) &_G.spiltSet);
4160 /* mark all registers as free */
4161 //pic14_freeAllRegs ();
4163 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");