1 /*------------------------------------------------------------------------
3 SDCCralloc.c - source file for register allocation. (8051) specific
5 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998)
6 Added Pic Port T.scott Dattalo scott@dattalo.com (2000)
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 In other words, you are welcome to use, share and improve this program.
23 You are forbidden to forbid anyone else to use, share and improve
24 what you give them. Help stamp out software-hoarding!
25 -------------------------------------------------------------------------*/
32 #if defined(__BORLANDC__) || defined(_MSC_VER)
33 #define STRCASECMP stricmp
35 #define STRCASECMP strcasecmp
38 /* this should go in SDCCicode.h, but it doesn't. */
39 #define IS_REF(op) (IS_SYMOP(op) && op->operand.symOperand->isref == 1)
41 /*-----------------------------------------------------------------*/
42 /* At this point we start getting processor specific although */
43 /* some routines are non-processor specific & can be reused when */
44 /* targetting other processors. The decision for this will have */
45 /* to be made on a routine by routine basis */
46 /* routines used to pack registers are most definitely not reusable */
47 /* since the pack the registers depending strictly on the MCU */
48 /*-----------------------------------------------------------------*/
50 extern void genpic14Code (iCode *);
51 extern void assignConfigWordValue(int address, int value);
61 bitVect *funcrUsed; /* registers used in a function */
67 /* Shared with gen.c */
68 int pic14_ptrRegReq; /* one byte pointer register required */
71 set *dynAllocRegs=NULL;
72 set *dynStackRegs=NULL;
73 set *dynProcessorRegs=NULL;
74 set *dynDirectRegs=NULL;
75 set *dynDirectBitRegs=NULL;
76 set *dynInternalRegs=NULL;
78 static hTab *dynDirectRegNames= NULL;
79 // static hTab *regHash = NULL; /* a hash table containing ALL registers */
81 static int dynrIdx=0x20;
82 static int rDirectIdx=0;
84 int pic14_nRegs = 128; // = sizeof (regspic14) / sizeof (regs);
86 int Gstack_base_addr=0; /* The starting address of registers that
87 * are used to pass and return parameters */
92 static void spillThis (symbol *);
94 static FILE *debugF = NULL;
95 /*-----------------------------------------------------------------*/
96 /* debugLog - open a file for debugging information */
97 /*-----------------------------------------------------------------*/
98 //static void debugLog(char *inst,char *fmt, ...)
100 debugLog (char *fmt,...)
102 static int append = 0; // First time through, open the file without append.
105 //char *bufferP=buffer;
108 if (!debug || !dstFileName)
114 /* create the file name */
115 strcpy (buffer, dstFileName);
116 strcat (buffer, ".d");
118 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
120 werror (E_FILE_OPEN_ERR, buffer);
123 append = 1; // Next time debubLog is called, we'll append the debug info
129 vsprintf (buffer, fmt, ap);
131 fprintf (debugF, "%s", buffer);
133 while (isspace(*bufferP)) bufferP++;
135 if (bufferP && *bufferP)
136 lineCurr = (lineCurr ?
137 connectLine(lineCurr,newLineNode(lb)) :
138 (lineHead = newLineNode(lb)));
139 lineCurr->isInline = _G.inLine;
140 lineCurr->isDebug = _G.debugLine;
150 fputc ('\n', debugF);
152 /*-----------------------------------------------------------------*/
153 /* debugLogClose - closes the debug log file (if opened) */
154 /*-----------------------------------------------------------------*/
164 #define AOP(op) op->aop
167 debugAopGet (char *str, operand * op)
172 printOperand (op, debugF);
180 decodeOp (unsigned int op)
183 if (op < 128 && op > ' ')
185 buffer[0] = (op & 0xff);
199 return "STRING_LITERAL";
235 return "LEFT_ASSIGN";
237 return "RIGHT_ASSIGN";
352 case GET_VALUE_AT_ADDRESS:
353 return "GET_VALUE_AT_ADDRESS";
371 return "ENDFUNCTION";
395 sprintf (buffer, "unknown op %d %c", op, op & 0xff);
398 /*-----------------------------------------------------------------*/
399 /*-----------------------------------------------------------------*/
401 debugLogRegType (short type)
414 sprintf (buffer, "unknown reg type %d", type);
418 /*-----------------------------------------------------------------*/
419 /*-----------------------------------------------------------------*/
420 static int regname2key(char const *name)
429 key += (*name++) + 1;
433 return ( (key + (key >> 4) + (key>>8)) & 0x3f);
437 /*-----------------------------------------------------------------*/
438 /* newReg - allocate and init memory for a new register */
439 /*-----------------------------------------------------------------*/
440 static regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias)
445 dReg = Safe_calloc(1,sizeof(regs));
447 dReg->pc_type = pc_type;
450 dReg->name = Safe_strdup(name);
452 sprintf(buffer,"r0x%02X", dReg->rIdx);
453 dReg->name = Safe_strdup(buffer);
455 //fprintf(stderr,"newReg: %s, rIdx = 0x%02x\n",dReg->name,rIdx);
470 dReg->reg_alias = NULL;
471 dReg->reglives.usedpFlows = newSet();
472 dReg->reglives.assignedpFlows = newSet();
474 hTabAddItem(&dynDirectRegNames, regname2key(name), dReg);
479 /*-----------------------------------------------------------------*/
480 /* regWithIdx - Search through a set of registers that matches idx */
481 /*-----------------------------------------------------------------*/
483 regWithIdx (set *dRegs, int idx, int fixed)
487 for (dReg = setFirstItem(dRegs) ; dReg ;
488 dReg = setNextItem(dRegs)) {
490 if(idx == dReg->rIdx && (fixed == (int)dReg->isFixed)) {
498 /*-----------------------------------------------------------------*/
499 /* regWithName - Search through a set of registers that matches name */
500 /*-----------------------------------------------------------------*/
502 regWithName (set *dRegs, const char *name)
506 for (dReg = setFirstItem(dRegs) ; dReg ;
507 dReg = setNextItem(dRegs)) {
509 if((strcmp(name,dReg->name)==0)) {
517 /*-----------------------------------------------------------------*/
518 /* regWithName - Search for a registers that matches name */
519 /*-----------------------------------------------------------------*/
521 regFindWithName (const char *name)
525 if( (dReg = regWithName ( dynDirectRegs, name)) != NULL ) {
526 debugLog ("Found a Direct Register!\n");
529 if( (dReg = regWithName ( dynDirectBitRegs, name)) != NULL) {
530 debugLog ("Found a Direct Bit Register!\n");
534 if (*name=='_') name++; // Step passed '_'
536 if( (dReg = regWithName ( dynAllocRegs, name)) != NULL) {
537 debugLog ("Found a Dynamic Register!\n");
540 if( (dReg = regWithName ( dynProcessorRegs, name)) != NULL) {
541 debugLog ("Found a Processor Register!\n");
544 if( (dReg = regWithName ( dynInternalRegs, name)) != NULL) {
545 debugLog ("Found an Internal Register!\n");
548 if( (dReg = regWithName ( dynStackRegs, name)) != NULL) {
549 debugLog ("Found an Stack Register!\n");
556 /*-----------------------------------------------------------------*/
557 /* regFindFree - Search for a free register in a set of registers */
558 /*-----------------------------------------------------------------*/
560 regFindFree (set *dRegs)
564 for (dReg = setFirstItem(dRegs) ; dReg ;
565 dReg = setNextItem(dRegs)) {
573 /*-----------------------------------------------------------------*/
574 /* initStack - allocate registers for a psuedo stack */
575 /*-----------------------------------------------------------------*/
576 void initStack(int base_address, int size)
581 Gstack_base_addr = base_address;
582 //fprintf(stderr,"initStack");
584 for(i = 0; i<size; i++) {
585 regs *r = newReg(REG_STK, PO_GPR_TEMP,base_address,NULL,1,0);
586 r->address = base_address; // Pseudo stack needs a fixed location that can be known by all modules
589 r->alias = 0x180; // Using shared memory for pseudo stack
590 addSet(&dynStackRegs,r);
595 /*-----------------------------------------------------------------*
596 *-----------------------------------------------------------------*/
598 allocProcessorRegister(int rIdx, char * name, short po_type, int alias)
601 //fprintf(stderr,"allocProcessorRegister %s addr =0x%x\n",name,rIdx);
602 return addSet(&dynProcessorRegs,newReg(REG_SFR, po_type, rIdx, name,1,alias));
605 /*-----------------------------------------------------------------*
606 *-----------------------------------------------------------------*/
609 allocInternalRegister(int rIdx, char * name, short po_type, int alias)
611 regs * reg = newReg(REG_GPR, po_type, rIdx, name,1,alias);
613 //fprintf(stderr,"allocInternalRegister %s addr =0x%x\n",name,rIdx);
616 return addSet(&dynInternalRegs,reg);
621 /*-----------------------------------------------------------------*/
622 /* allocReg - allocates register of given type */
623 /*-----------------------------------------------------------------*/
625 allocReg (short type)
628 debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
629 //fprintf(stderr,"allocReg\n");
632 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
637 /*-----------------------------------------------------------------*/
638 /* dirregWithName - search for register by name */
639 /*-----------------------------------------------------------------*/
641 dirregWithName (char *name)
649 /* hash the name to get a key */
651 hkey = regname2key(name);
653 reg = hTabFirstItemWK(dynDirectRegNames, hkey);
657 if(STRCASECMP(reg->name, name) == 0) {
661 reg = hTabNextItemWK (dynDirectRegNames);
665 return NULL; // name wasn't found in the hash table
668 int IS_CONFIG_ADDRESS(int address)
671 return address == 0x2007;
674 /*-----------------------------------------------------------------*/
675 /* allocNewDirReg - allocates a new register of given type */
676 /*-----------------------------------------------------------------*/
678 allocNewDirReg (sym_link *symlnk,const char *name)
683 /* if this is at an absolute address, then get the address. */
684 if (SPEC_ABSA (symlnk) ) {
685 address = SPEC_ADDR (symlnk);
686 //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
689 /* Register wasn't found in hash, so let's create
690 * a new one and put it in the hash table AND in the
691 * dynDirectRegNames set */
692 if (IS_CONFIG_ADDRESS(address)) {
693 debugLog (" -- %s is declared at address 0x2007\n",name);
698 if (IS_BITVAR (symlnk))
705 reg = newReg(REG_GPR, PO_DIR, idx, (char*)name,getSize (symlnk),0 );
706 debugLog (" -- added %s to hash, size = %d\n", (char*)name,reg->size);
708 if (SPEC_ABSA (symlnk) ) {
712 if (IS_BITVAR (symlnk)) {
713 addSet(&dynDirectBitRegs, reg);
716 addSet(&dynDirectRegs, reg);
718 if (!IS_STATIC (symlnk)) {
721 if (IS_EXTERN (symlnk)) {
727 if (address && reg) {
729 reg->address = address;
730 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
736 /*-----------------------------------------------------------------*/
737 /* allocDirReg - allocates register of given type */
738 /*-----------------------------------------------------------------*/
740 allocDirReg (operand *op )
747 debugLog ("%s BAD, op is NULL\n", __FUNCTION__);
751 name = OP_SYMBOL (op)->rname[0] ? OP_SYMBOL (op)->rname : OP_SYMBOL (op)->name;
753 /* If the symbol is at a fixed address, then remove the leading underscore
754 * from the name. This is hack to allow the .asm include file named registers
755 * to match the .c declared register names */
757 //if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && (*name == '_'))
760 debugLog ("%s symbol name %s\n", __FUNCTION__,name);
762 if(SPEC_CONST ( OP_SYM_ETYPE(op)) && (IS_CHAR ( OP_SYM_ETYPE(op)) )) {
763 debugLog(" %d const char\n",__LINE__);
764 debugLog(" value = %s \n",SPEC_CVAL( OP_SYM_ETYPE(op)));
767 debugLog(" %d storage class %d \n",__LINE__,SPEC_SCLS( OP_SYM_ETYPE(op)));
768 if (IS_CODE ( OP_SYM_ETYPE(op)) )
769 debugLog(" %d code space\n",__LINE__);
771 if (IS_INTEGRAL ( OP_SYM_ETYPE(op)) )
772 debugLog(" %d integral\n",__LINE__);
773 if (IS_LITERAL ( OP_SYM_ETYPE(op)) )
774 debugLog(" %d literal\n",__LINE__);
775 if (IS_SPEC ( OP_SYM_ETYPE(op)) )
776 debugLog(" %d specifier\n",__LINE__);
777 debugAopGet(NULL, op);
780 if (IS_CODE ( OP_SYM_ETYPE(op)) )
783 /* First, search the hash table to see if there is a register with this name */
784 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) && !(IS_BITVAR (OP_SYM_ETYPE(op))) ) {
785 reg = regWithIdx (dynProcessorRegs, SPEC_ADDR ( OP_SYM_ETYPE(op)), 1);
788 fprintf(stderr,"ralloc %s is at fixed address but not a processor reg, addr=0x%x\n",
789 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
791 fprintf(stderr,"ralloc %s at fixed address has already been declared, addr=0x%x\n",
792 name, SPEC_ADDR ( OP_SYM_ETYPE(op)));
795 //fprintf(stderr,"ralloc:%d %s \n", __LINE__,name);
797 reg = dirregWithName(name);
804 /* if this is at an absolute address, then get the address. */
805 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
806 address = SPEC_ADDR ( OP_SYM_ETYPE(op));
807 //fprintf(stderr,"reg %s is at an absolute address: 0x%03x\n",name,address);
810 /* Register wasn't found in hash, so let's create
811 * a new one and put it in the hash table AND in the
812 * dynDirectRegNames set */
813 if(!IS_CONFIG_ADDRESS(address)) {
814 //fprintf(stderr,"allocating new reg %s\n",name);
816 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,getSize (OP_SYMBOL (op)->type),0 );
817 debugLog (" -- added %s to hash, size = %d\n", name,reg->size);
819 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
821 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
823 //fprintf(stderr, " ralloc.c at fixed address: %s - changing to REG_SFR\n",name);
827 if (IS_BITVAR (OP_SYM_ETYPE(op))) {
828 addSet(&dynDirectBitRegs, reg);
831 addSet(&dynDirectRegs, reg);
833 if (!IS_STATIC (OP_SYM_ETYPE(op))) {
836 if (IS_EXTERN (OP_SYM_ETYPE(op))) {
842 debugLog (" -- %s is declared at address 0x2007\n",name);
847 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
849 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
850 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
855 if (SPEC_ABSA ( OP_SYM_ETYPE(op)) ) {
857 reg->address = SPEC_ADDR ( OP_SYM_ETYPE(op));
858 debugLog (" -- and it is at a fixed address 0x%02x\n",reg->address);
861 allocNewDirReg (OP_SYM_ETYPE(op),name);
868 /*-----------------------------------------------------------------*/
869 /* allocRegByName - allocates register with given name */
870 /*-----------------------------------------------------------------*/
872 allocRegByName (char *name, int size)
878 fprintf(stderr, "%s - allocating a NULL register\n",__FUNCTION__);
882 /* First, search the hash table to see if there is a register with this name */
883 reg = dirregWithName(name);
889 /* Register wasn't found in hash, so let's create
890 * a new one and put it in the hash table AND in the
891 * dynDirectRegNames set */
892 //fprintf (stderr,"%s symbol name %s\n", __FUNCTION__,name);
893 reg = newReg(REG_GPR, PO_DIR, rDirectIdx++, name,size,0 );
894 for (sym = setFirstItem(sfr->syms); sym; sym = setNextItem(sfr->syms)) {
895 if (strcmp(reg->name+1,sym->name)==0) {
896 unsigned a = SPEC_ADDR(sym->etype);
900 if (!IS_STATIC (sym->etype)) {
903 if (IS_EXTERN (sym->etype)) {
906 if (IS_BITVAR (sym->etype))
913 for (sym = setFirstItem(data->syms); sym; sym = setNextItem(data->syms)) {
914 if (strcmp(reg->name+1,sym->name)==0) {
915 unsigned a = SPEC_ADDR(sym->etype);
917 if (!IS_STATIC (sym->etype)) {
920 if (IS_EXTERN (sym->etype)) {
923 if (IS_BITVAR (sym->etype))
931 debugLog (" -- added %s to hash, size = %d\n", name,reg->size);
933 //hTabAddItem(&dynDirectRegNames, regname2key(name), reg);
934 if (reg->isBitField) {
935 addSet(&dynDirectBitRegs, reg);
937 addSet(&dynDirectRegs, reg);
943 /*-----------------------------------------------------------------*/
944 /* RegWithIdx - returns pointer to register with index number */
945 /*-----------------------------------------------------------------*/
947 typeRegWithIdx (int idx, int type, int fixed)
952 debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
957 if( (dReg = regWithIdx ( dynAllocRegs, idx, fixed)) != NULL) {
959 debugLog ("Found a Dynamic Register!\n");
962 if( (dReg = regWithIdx ( dynDirectRegs, idx, fixed)) != NULL ) {
963 debugLog ("Found a Direct Register!\n");
969 if( (dReg = regWithIdx ( dynStackRegs, idx, fixed)) != NULL ) {
970 debugLog ("Found a Stack Register!\n");
975 if( (dReg = regWithIdx ( dynProcessorRegs, idx, fixed)) != NULL ) {
976 debugLog ("Found a Processor Register!\n");
990 /*-----------------------------------------------------------------*/
991 /* pic14_regWithIdx - returns pointer to register with index number*/
992 /*-----------------------------------------------------------------*/
994 pic14_regWithIdx (int idx)
998 if( (dReg = typeRegWithIdx(idx,REG_GPR,0)) != NULL)
1001 if( (dReg = typeRegWithIdx(idx,REG_SFR,0)) != NULL)
1007 /*-----------------------------------------------------------------*/
1008 /* pic14_regWithIdx - returns pointer to register with index number */
1009 /*-----------------------------------------------------------------*/
1011 pic14_allocWithIdx (int idx)
1016 debugLog ("%s - allocating with index = 0x%x\n", __FUNCTION__,idx);
1018 if( (dReg = regWithIdx ( dynAllocRegs, idx,0)) != NULL) {
1020 debugLog ("Found a Dynamic Register!\n");
1021 } else if( (dReg = regWithIdx ( dynStackRegs, idx,0)) != NULL ) {
1022 debugLog ("Found a Stack Register!\n");
1023 } else if( (dReg = regWithIdx ( dynProcessorRegs, idx,0)) != NULL ) {
1024 debugLog ("Found a Processor Register!\n");
1025 } else if( (dReg = regWithIdx ( dynInternalRegs, idx,0)) != NULL ) {
1026 debugLog ("Found an Internal Register!\n");
1027 } else if( (dReg = regWithIdx ( dynInternalRegs, idx,1)) != NULL ) {
1028 debugLog ("Found an Internal Register!\n");
1031 debugLog ("Dynamic Register not found\n");
1034 //fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
1035 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1036 "regWithIdx not found");
1046 /*-----------------------------------------------------------------*/
1047 /*-----------------------------------------------------------------*/
1049 pic14_findFreeReg(short type)
1056 if((dReg = regFindFree(dynAllocRegs)) != NULL)
1058 return addSet(&dynAllocRegs,newReg(REG_GPR, PO_GPR_TEMP,dynrIdx++,NULL,1,0));
1062 if((dReg = regFindFree(dynStackRegs)) != NULL)
1074 /*-----------------------------------------------------------------*/
1075 /* freeReg - frees a register */
1076 /*-----------------------------------------------------------------*/
1078 freeReg (regs * reg)
1080 debugLog ("%s\n", __FUNCTION__);
1085 /*-----------------------------------------------------------------*/
1086 /* nFreeRegs - returns number of free registers */
1087 /*-----------------------------------------------------------------*/
1089 nFreeRegs (int type)
1091 /* dynamically allocate as many as we need and worry about
1092 * fitting them into a PIC later */
1099 debugLog ("%s\n", __FUNCTION__);
1100 for (i = 0; i < pic14_nRegs; i++)
1101 if (regspic14[i].isFree && regspic14[i].type == type)
1107 /*-----------------------------------------------------------------*/
1108 /* nfreeRegsType - free registers with type */
1109 /*-----------------------------------------------------------------*/
1111 nfreeRegsType (int type)
1114 debugLog ("%s\n", __FUNCTION__);
1115 if (type == REG_PTR)
1117 if ((nfr = nFreeRegs (type)) == 0)
1118 return nFreeRegs (REG_GPR);
1121 return nFreeRegs (type);
1124 void writeSetUsedRegs(FILE *of, set *dRegs)
1129 for (dReg = setFirstItem(dRegs) ; dReg ;
1130 dReg = setNextItem(dRegs)) {
1133 fprintf (of, "\t%s\n",dReg->name);
1137 extern void assignFixedRegisters(set *regset);
1138 extern void assignRelocatableRegisters(set *regset,int used);
1139 extern void dump_map(void);
1140 extern void dump_sfr(FILE *of);
1142 void packBits(set *bregs)
1146 regs *bitfield=NULL;
1147 regs *relocbitfield=NULL;
1153 for (regset = bregs ; regset ;
1154 regset = regset->next) {
1156 breg = regset->item;
1157 breg->isBitField = 1;
1158 //fprintf(stderr,"bit reg: %s\n",breg->name);
1161 //fprintf(stderr,"packing bit at fixed address = 0x%03x\n",breg->address);
1163 bitfield = typeRegWithIdx (breg->address >> 3, -1 , 1);
1164 breg->rIdx = breg->address & 7;
1165 breg->address >>= 3;
1168 //sprintf (buffer, "fbitfield%02x", breg->address);
1169 sprintf (buffer, "0x%02x", breg->address);
1170 //fprintf(stderr,"new bit field\n");
1171 bitfield = newReg(REG_SFR, PO_GPR_BIT,breg->address,buffer,1,0);
1172 bitfield->isBitField = 1;
1173 bitfield->isFixed = 1;
1174 bitfield->address = breg->address;
1175 //addSet(&dynDirectRegs,bitfield);
1176 addSet(&dynInternalRegs,bitfield);
1177 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), bitfield);
1179 //fprintf(stderr," which is occupied by %s (addr = %d)\n",bitfield->name,bitfield->address);
1182 breg->reg_alias = bitfield;
1186 if(!relocbitfield || bit_no >7) {
1189 sprintf (buffer, "bitfield%d", byte_no);
1190 //fprintf(stderr,"new relocatable bit field\n");
1191 relocbitfield = newReg(REG_GPR, PO_GPR_BIT,rDirectIdx++,buffer,1,0);
1192 relocbitfield->isBitField = 1;
1193 //addSet(&dynDirectRegs,relocbitfield);
1194 addSet(&dynInternalRegs,relocbitfield);
1195 //hTabAddItem(&dynDirectRegNames, regname2key(buffer), relocbitfield);
1199 breg->reg_alias = relocbitfield;
1200 breg->address = rDirectIdx; /* byte_no; */
1201 breg->rIdx = bit_no++;
1209 void bitEQUs(FILE *of, set *bregs)
1211 regs *breg,*bytereg;
1214 //fprintf(stderr," %s\n",__FUNCTION__);
1215 for (breg = setFirstItem(bregs) ; breg ;
1216 breg = setNextItem(bregs)) {
1218 //fprintf(stderr,"bit reg: %s\n",breg->name);
1220 bytereg = breg->reg_alias;
1222 fprintf (of, "%s\tEQU\t( (%s<<3)+%d)\n",
1225 breg->rIdx & 0x0007);
1228 //fprintf(stderr, "bit field is not assigned to a register\n");
1229 fprintf (of, "%s\tEQU\t( (bitfield%d<<3)+%d)\n",
1239 void aliasEQUs(FILE *of, set *fregs, int use_rIdx)
1244 for (reg = setFirstItem(fregs) ; reg ;
1245 reg = setNextItem(fregs)) {
1247 //if(!reg->isEmitted && reg->wasUsed) {
1250 fprintf (of, "%s\tEQU\t0x%03x\n",
1254 fprintf (of, "%s\tEQU\t0x%03x\n",
1262 void writeUsedRegs(FILE *of)
1264 packBits(dynDirectBitRegs);
1266 assignFixedRegisters(dynInternalRegs);
1267 assignFixedRegisters(dynAllocRegs);
1268 assignFixedRegisters(dynStackRegs);
1269 assignFixedRegisters(dynDirectRegs);
1271 assignRelocatableRegisters(dynInternalRegs,0);
1272 assignRelocatableRegisters(dynAllocRegs,0);
1273 assignRelocatableRegisters(dynStackRegs,0);
1276 assignRelocatableRegisters(dynDirectRegs,0);
1277 printf("assignRelocatableRegisters(dynDirectRegs,0);\n");
1282 bitEQUs(of,dynDirectBitRegs);
1284 aliasEQUs(of,dynAllocRegs,0);
1285 aliasEQUs(of,dynDirectRegs,0);
1286 aliasEQUs(of,dynStackRegs,0);
1287 aliasEQUs(of,dynProcessorRegs,1);
1292 /*-----------------------------------------------------------------*/
1293 /* allDefsOutOfRange - all definitions are out of a range */
1294 /*-----------------------------------------------------------------*/
1296 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
1300 debugLog ("%s\n", __FUNCTION__);
1304 for (i = 0; i < defs->size; i++)
1308 if (bitVectBitValue (defs, i) &&
1309 (ic = hTabItemWithKey (iCodehTab, i)) &&
1310 (ic->seq >= fseq && ic->seq <= toseq))
1320 /*-----------------------------------------------------------------*/
1321 /* computeSpillable - given a point find the spillable live ranges */
1322 /*-----------------------------------------------------------------*/
1324 computeSpillable (iCode * ic)
1328 debugLog ("%s\n", __FUNCTION__);
1329 /* spillable live ranges are those that are live at this
1330 point . the following categories need to be subtracted
1332 a) - those that are already spilt
1333 b) - if being used by this one
1334 c) - defined by this one */
1336 spillable = bitVectCopy (ic->rlive);
1338 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
1340 bitVectCplAnd (spillable, ic->uses); /* used in this one */
1341 bitVectUnSetBit (spillable, ic->defKey);
1342 spillable = bitVectIntersect (spillable, _G.regAssigned);
1347 /*-----------------------------------------------------------------*/
1348 /* noSpilLoc - return true if a variable has no spil location */
1349 /*-----------------------------------------------------------------*/
1351 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1353 debugLog ("%s\n", __FUNCTION__);
1354 return (sym->usl.spillLoc ? 0 : 1);
1357 /*-----------------------------------------------------------------*/
1358 /* hasSpilLoc - will return 1 if the symbol has spil location */
1359 /*-----------------------------------------------------------------*/
1361 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1363 debugLog ("%s\n", __FUNCTION__);
1364 return (sym->usl.spillLoc ? 1 : 0);
1367 /*-----------------------------------------------------------------*/
1368 /* directSpilLoc - will return 1 if the splilocation is in direct */
1369 /*-----------------------------------------------------------------*/
1371 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
1373 debugLog ("%s\n", __FUNCTION__);
1374 if (sym->usl.spillLoc &&
1375 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
1381 /*-----------------------------------------------------------------*/
1382 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
1383 /* but is not used as a pointer */
1384 /*-----------------------------------------------------------------*/
1386 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
1388 debugLog ("%s\n", __FUNCTION__);
1389 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
1392 /*-----------------------------------------------------------------*/
1393 /* rematable - will return 1 if the remat flag is set */
1394 /*-----------------------------------------------------------------*/
1396 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
1398 debugLog ("%s\n", __FUNCTION__);
1402 /*-----------------------------------------------------------------*/
1403 /* notUsedInRemaining - not used or defined in remain of the block */
1404 /*-----------------------------------------------------------------*/
1406 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
1408 debugLog ("%s\n", __FUNCTION__);
1409 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
1410 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
1413 /*-----------------------------------------------------------------*/
1414 /* allLRs - return true for all */
1415 /*-----------------------------------------------------------------*/
1417 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
1419 debugLog ("%s\n", __FUNCTION__);
1423 /*-----------------------------------------------------------------*/
1424 /* liveRangesWith - applies function to a given set of live range */
1425 /*-----------------------------------------------------------------*/
1427 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
1428 eBBlock * ebp, iCode * ic)
1433 debugLog ("%s\n", __FUNCTION__);
1434 if (!lrs || !lrs->size)
1437 for (i = 1; i < lrs->size; i++)
1440 if (!bitVectBitValue (lrs, i))
1443 /* if we don't find it in the live range
1444 hash table we are in serious trouble */
1445 if (!(sym = hTabItemWithKey (liveRanges, i)))
1447 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1448 "liveRangesWith could not find liveRange");
1452 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
1453 addSetHead (&rset, sym);
1460 /*-----------------------------------------------------------------*/
1461 /* leastUsedLR - given a set determines which is the least used */
1462 /*-----------------------------------------------------------------*/
1464 leastUsedLR (set * sset)
1466 symbol *sym = NULL, *lsym = NULL;
1468 debugLog ("%s\n", __FUNCTION__);
1469 sym = lsym = setFirstItem (sset);
1474 for (; lsym; lsym = setNextItem (sset))
1477 /* if usage is the same then prefer
1478 the spill the smaller of the two */
1479 if (lsym->used == sym->used)
1480 if (getSize (lsym->type) < getSize (sym->type))
1484 if (lsym->used < sym->used)
1489 setToNull ((void *) &sset);
1494 /*-----------------------------------------------------------------*/
1495 /* noOverLap - will iterate through the list looking for over lap */
1496 /*-----------------------------------------------------------------*/
1498 noOverLap (set * itmpStack, symbol * fsym)
1501 debugLog ("%s\n", __FUNCTION__);
1504 for (sym = setFirstItem (itmpStack); sym;
1505 sym = setNextItem (itmpStack))
1507 if (sym->liveTo > fsym->liveFrom)
1515 /*-----------------------------------------------------------------*/
1516 /* isFree - will return 1 if the a free spil location is found */
1517 /*-----------------------------------------------------------------*/
1522 V_ARG (symbol **, sloc);
1523 V_ARG (symbol *, fsym);
1525 debugLog ("%s\n", __FUNCTION__);
1526 /* if already found */
1530 /* if it is free && and the itmp assigned to
1531 this does not have any overlapping live ranges
1532 with the one currently being assigned and
1533 the size can be accomodated */
1535 noOverLap (sym->usl.itmpStack, fsym) &&
1536 getSize (sym->type) >= getSize (fsym->type))
1545 /*-----------------------------------------------------------------*/
1546 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
1547 /*-----------------------------------------------------------------*/
1549 spillLRWithPtrReg (symbol * forSym)
1555 debugLog ("%s\n", __FUNCTION__);
1556 if (!_G.regAssigned ||
1557 bitVectIsZero (_G.regAssigned))
1560 r0 = pic14_regWithIdx (R0_IDX);
1561 r1 = pic14_regWithIdx (R1_IDX);
1563 /* for all live ranges */
1564 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
1565 lrsym = hTabNextItem (liveRanges, &k))
1569 /* if no registers assigned to it or
1571 /* if it does not overlap with this then
1572 not need to spill it */
1574 if (lrsym->isspilt || !lrsym->nRegs ||
1575 (lrsym->liveTo < forSym->liveFrom))
1578 /* go thru the registers : if it is either
1579 r0 or r1 then spil it */
1580 for (j = 0; j < lrsym->nRegs; j++)
1581 if (lrsym->regs[j] == r0 ||
1582 lrsym->regs[j] == r1)
1591 /*-----------------------------------------------------------------*/
1592 /* createStackSpil - create a location on the stack to spil */
1593 /*-----------------------------------------------------------------*/
1595 createStackSpil (symbol * sym)
1597 symbol *sloc = NULL;
1598 int useXstack, model, noOverlay;
1600 char slocBuffer[30];
1601 debugLog ("%s\n", __FUNCTION__);
1603 /* first go try and find a free one that is already
1604 existing on the stack */
1605 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
1607 /* found a free one : just update & return */
1608 sym->usl.spillLoc = sloc;
1611 addSetHead (&sloc->usl.itmpStack, sym);
1615 /* could not then have to create one , this is the hard part
1616 we need to allocate this on the stack : this is really a
1617 hack!! but cannot think of anything better at this time */
1619 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
1621 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
1622 __FILE__, __LINE__);
1626 sloc = newiTemp (slocBuffer);
1628 /* set the type to the spilling symbol */
1629 sloc->type = copyLinkChain (sym->type);
1630 sloc->etype = getSpec (sloc->type);
1631 SPEC_SCLS (sloc->etype) = S_DATA;
1632 SPEC_EXTR (sloc->etype) = 0;
1633 SPEC_STAT (sloc->etype) = 0;
1635 /* we don't allow it to be allocated`
1636 onto the external stack since : so we
1637 temporarily turn it off ; we also
1638 turn off memory model to prevent
1639 the spil from going to the external storage
1640 and turn off overlaying
1643 useXstack = options.useXstack;
1644 model = options.model;
1645 noOverlay = options.noOverlay;
1646 options.noOverlay = 1;
1647 options.model = options.useXstack = 0;
1651 options.useXstack = useXstack;
1652 options.model = model;
1653 options.noOverlay = noOverlay;
1654 sloc->isref = 1; /* to prevent compiler warning */
1656 /* if it is on the stack then update the stack */
1657 if (IN_STACK (sloc->etype))
1659 currFunc->stack += getSize (sloc->type);
1660 _G.stackExtend += getSize (sloc->type);
1663 _G.dataExtend += getSize (sloc->type);
1665 /* add it to the _G.stackSpil set */
1666 addSetHead (&_G.stackSpil, sloc);
1667 sym->usl.spillLoc = sloc;
1670 /* add it to the set of itempStack set
1671 of the spill location */
1672 addSetHead (&sloc->usl.itmpStack, sym);
1676 /*-----------------------------------------------------------------*/
1677 /* isSpiltOnStack - returns true if the spil location is on stack */
1678 /*-----------------------------------------------------------------*/
1680 isSpiltOnStack (symbol * sym)
1684 debugLog ("%s\n", __FUNCTION__);
1691 /* if (sym->_G.stackSpil) */
1694 if (!sym->usl.spillLoc)
1697 etype = getSpec (sym->usl.spillLoc->type);
1698 if (IN_STACK (etype))
1704 /*-----------------------------------------------------------------*/
1705 /* spillThis - spils a specific operand */
1706 /*-----------------------------------------------------------------*/
1708 spillThis (symbol * sym)
1711 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1713 /* if this is rematerializable or has a spillLocation
1714 we are okay, else we need to create a spillLocation
1716 if (!(sym->remat || sym->usl.spillLoc))
1717 createStackSpil (sym);
1720 /* mark it has spilt & put it in the spilt set */
1722 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1724 bitVectUnSetBit (_G.regAssigned, sym->key);
1726 for (i = 0; i < sym->nRegs; i++)
1730 freeReg (sym->regs[i]);
1731 sym->regs[i] = NULL;
1734 /* if spilt on stack then free up r0 & r1
1735 if they could have been assigned to some
1737 if (!pic14_ptrRegReq && isSpiltOnStack (sym))
1740 spillLRWithPtrReg (sym);
1743 if (sym->usl.spillLoc && !sym->remat)
1744 sym->usl.spillLoc->allocreq = 1;
1748 /*-----------------------------------------------------------------*/
1749 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1750 /*-----------------------------------------------------------------*/
1752 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1754 bitVect *lrcs = NULL;
1758 debugLog ("%s\n", __FUNCTION__);
1759 /* get the spillable live ranges */
1760 lrcs = computeSpillable (ic);
1762 /* get all live ranges that are rematerizable */
1763 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1766 /* return the least used of these */
1767 return leastUsedLR (selectS);
1770 /* get live ranges with spillLocations in direct space */
1771 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1773 sym = leastUsedLR (selectS);
1774 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1775 sym->usl.spillLoc->rname :
1776 sym->usl.spillLoc->name));
1778 /* mark it as allocation required */
1779 sym->usl.spillLoc->allocreq = 1;
1783 /* if the symbol is local to the block then */
1784 if (forSym->liveTo < ebp->lSeq)
1787 /* check if there are any live ranges allocated
1788 to registers that are not used in this block */
1789 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1791 sym = leastUsedLR (selectS);
1792 /* if this is not rematerializable */
1801 /* check if there are any live ranges that not
1802 used in the remainder of the block */
1803 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1805 sym = leastUsedLR (selectS);
1808 sym->remainSpil = 1;
1815 /* find live ranges with spillocation && not used as pointers */
1816 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1819 sym = leastUsedLR (selectS);
1820 /* mark this as allocation required */
1821 sym->usl.spillLoc->allocreq = 1;
1825 /* find live ranges with spillocation */
1826 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1829 sym = leastUsedLR (selectS);
1830 sym->usl.spillLoc->allocreq = 1;
1834 /* couldn't find then we need to create a spil
1835 location on the stack , for which one? the least
1837 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1840 /* return a created spil location */
1841 sym = createStackSpil (leastUsedLR (selectS));
1842 sym->usl.spillLoc->allocreq = 1;
1846 /* this is an extreme situation we will spill
1847 this one : happens very rarely but it does happen */
1853 /*-----------------------------------------------------------------*/
1854 /* spilSomething - spil some variable & mark registers as free */
1855 /*-----------------------------------------------------------------*/
1857 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1862 debugLog ("%s\n", __FUNCTION__);
1863 /* get something we can spil */
1864 ssym = selectSpil (ic, ebp, forSym);
1866 /* mark it as spilt */
1868 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1870 /* mark it as not register assigned &
1871 take it away from the set */
1872 bitVectUnSetBit (_G.regAssigned, ssym->key);
1874 /* mark the registers as free */
1875 for (i = 0; i < ssym->nRegs; i++)
1877 freeReg (ssym->regs[i]);
1879 /* if spilt on stack then free up r0 & r1
1880 if they could have been assigned to as gprs */
1881 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1884 spillLRWithPtrReg (ssym);
1887 /* if this was a block level spil then insert push & pop
1888 at the start & end of block respectively */
1889 if (ssym->blockSpil)
1891 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1892 /* add push to the start of the block */
1893 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1894 ebp->sch->next : ebp->sch));
1895 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1896 /* add pop to the end of the block */
1897 addiCodeToeBBlock (ebp, nic, NULL);
1900 /* if spilt because not used in the remainder of the
1901 block then add a push before this instruction and
1902 a pop at the end of the block */
1903 if (ssym->remainSpil)
1906 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1907 /* add push just before this instruction */
1908 addiCodeToeBBlock (ebp, nic, ic);
1910 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1911 /* add pop to the end of the block */
1912 addiCodeToeBBlock (ebp, nic, NULL);
1921 /*-----------------------------------------------------------------*/
1922 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1923 /*-----------------------------------------------------------------*/
1925 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1930 debugLog ("%s\n", __FUNCTION__);
1932 /* try for a ptr type */
1933 if ((reg = allocReg (REG_PTR)))
1936 /* try for gpr type */
1937 if ((reg = allocReg (REG_GPR)))
1940 /* we have to spil */
1941 if (!spilSomething (ic, ebp, sym))
1944 /* make sure partially assigned registers aren't reused */
1945 for (j=0; j<=sym->nRegs; j++)
1947 sym->regs[j]->isFree = 0;
1949 /* this looks like an infinite loop but
1950 in really selectSpil will abort */
1954 /*-----------------------------------------------------------------*/
1955 /* getRegGpr - will try for GPR if not spil */
1956 /*-----------------------------------------------------------------*/
1958 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1963 debugLog ("%s\n", __FUNCTION__);
1965 /* try for gpr type */
1966 if ((reg = allocReg (REG_GPR)))
1969 if (!pic14_ptrRegReq)
1970 if ((reg = allocReg (REG_PTR)))
1973 /* we have to spil */
1974 if (!spilSomething (ic, ebp, sym))
1977 /* make sure partially assigned registers aren't reused */
1978 for (j=0; j<=sym->nRegs; j++)
1980 sym->regs[j]->isFree = 0;
1982 /* this looks like an infinite loop but
1983 in really selectSpil will abort */
1987 /*-----------------------------------------------------------------*/
1988 /* symHasReg - symbol has a given register */
1989 /*-----------------------------------------------------------------*/
1991 symHasReg (symbol * sym, regs * reg)
1995 debugLog ("%s\n", __FUNCTION__);
1996 for (i = 0; i < sym->nRegs; i++)
1997 if (sym->regs[i] == reg)
2003 /*-----------------------------------------------------------------*/
2004 /* deassignLRs - check the live to and if they have registers & are */
2005 /* not spilt then free up the registers */
2006 /*-----------------------------------------------------------------*/
2008 deassignLRs (iCode * ic, eBBlock * ebp)
2014 debugLog ("%s\n", __FUNCTION__);
2015 for (sym = hTabFirstItem (liveRanges, &k); sym;
2016 sym = hTabNextItem (liveRanges, &k))
2019 symbol *psym = NULL;
2020 /* if it does not end here */
2021 if (sym->liveTo > ic->seq)
2024 /* if it was spilt on stack then we can
2025 mark the stack spil location as free */
2030 sym->usl.spillLoc->isFree = 1;
2036 if (!bitVectBitValue (_G.regAssigned, sym->key))
2039 /* special case check if this is an IFX &
2040 the privious one was a pop and the
2041 previous one was not spilt then keep track
2043 if (ic->op == IFX && ic->prev &&
2044 ic->prev->op == IPOP &&
2045 !ic->prev->parmPush &&
2046 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
2047 psym = OP_SYMBOL (IC_LEFT (ic->prev));
2053 bitVectUnSetBit (_G.regAssigned, sym->key);
2055 /* if the result of this one needs registers
2056 and does not have it then assign it right
2058 if (IC_RESULT (ic) &&
2059 !(SKIP_IC2 (ic) || /* not a special icode */
2060 ic->op == JUMPTABLE ||
2065 POINTER_SET (ic)) &&
2066 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
2067 result->liveTo > ic->seq && /* and will live beyond this */
2068 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
2069 result->regType == sym->regType && /* same register types */
2070 result->nRegs && /* which needs registers */
2071 !result->isspilt && /* and does not already have them */
2073 !bitVectBitValue (_G.regAssigned, result->key) &&
2074 /* the number of free regs + number of regs in this LR
2075 can accomodate the what result Needs */
2076 ((nfreeRegsType (result->regType) +
2077 sym->nRegs) >= result->nRegs)
2081 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
2083 result->regs[i] = sym->regs[i];
2085 result->regs[i] = getRegGpr (ic, ebp, result);
2087 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
2091 /* free the remaining */
2092 for (; i < sym->nRegs; i++)
2096 if (!symHasReg (psym, sym->regs[i]))
2097 freeReg (sym->regs[i]);
2100 freeReg (sym->regs[i]);
2107 /*-----------------------------------------------------------------*/
2108 /* reassignLR - reassign this to registers */
2109 /*-----------------------------------------------------------------*/
2111 reassignLR (operand * op)
2113 symbol *sym = OP_SYMBOL (op);
2116 debugLog ("%s\n", __FUNCTION__);
2117 /* not spilt any more */
2118 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
2119 bitVectUnSetBit (_G.spiltSet, sym->key);
2121 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2125 for (i = 0; i < sym->nRegs; i++)
2126 sym->regs[i]->isFree = 0;
2129 /*-----------------------------------------------------------------*/
2130 /* willCauseSpill - determines if allocating will cause a spill */
2131 /*-----------------------------------------------------------------*/
2133 willCauseSpill (int nr, int rt)
2135 debugLog ("%s\n", __FUNCTION__);
2136 /* first check if there are any avlb registers
2137 of te type required */
2140 /* special case for pointer type
2141 if pointer type not avlb then
2142 check for type gpr */
2143 if (nFreeRegs (rt) >= nr)
2145 if (nFreeRegs (REG_GPR) >= nr)
2150 if (pic14_ptrRegReq)
2152 if (nFreeRegs (rt) >= nr)
2157 if (nFreeRegs (REG_PTR) +
2158 nFreeRegs (REG_GPR) >= nr)
2163 debugLog (" ... yep it will (cause a spill)\n");
2164 /* it will cause a spil */
2168 /*-----------------------------------------------------------------*/
2169 /* positionRegs - the allocator can allocate same registers to res- */
2170 /* ult and operand, if this happens make sure they are in the same */
2171 /* position as the operand otherwise chaos results */
2172 /*-----------------------------------------------------------------*/
2174 positionRegs (symbol * result, symbol * opsym, int lineno)
2176 int count = min (result->nRegs, opsym->nRegs);
2177 int i, j = 0, shared = 0;
2179 debugLog ("%s\n", __FUNCTION__);
2180 /* if the result has been spilt then cannot share */
2185 /* first make sure that they actually share */
2186 for (i = 0; i < count; i++)
2188 for (j = 0; j < count; j++)
2190 if (result->regs[i] == opsym->regs[j] && i != j)
2200 regs *tmp = result->regs[i];
2201 result->regs[i] = result->regs[j];
2202 result->regs[j] = tmp;
2207 /*------------------------------------------------------------------*/
2208 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
2209 /* it should either have registers or have beed spilled. Otherwise, */
2210 /* there was an uninitialized variable, so just spill this to get */
2211 /* the operand in a valid state. */
2212 /*------------------------------------------------------------------*/
2214 verifyRegsAssigned (operand *op, iCode * ic)
2219 if (!IS_ITEMP (op)) return;
2221 sym = OP_SYMBOL (op);
2222 if (sym->isspilt) return;
2223 if (!sym->nRegs) return;
2224 if (sym->regs[0]) return;
2226 werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
2227 sym->prereqv ? sym->prereqv->name : sym->name);
2232 /*-----------------------------------------------------------------*/
2233 /* serialRegAssign - serially allocate registers to the variables */
2234 /*-----------------------------------------------------------------*/
2236 serialRegAssign (eBBlock ** ebbs, int count)
2240 debugLog ("%s\n", __FUNCTION__);
2241 /* for all blocks */
2242 for (i = 0; i < count; i++)
2247 if (ebbs[i]->noPath &&
2248 (ebbs[i]->entryLabel != entryLabel &&
2249 ebbs[i]->entryLabel != returnLabel))
2252 /* of all instructions do */
2253 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2256 debugLog (" op: %s\n", decodeOp (ic->op));
2258 /* if this is an ipop that means some live
2259 range will have to be assigned again */
2261 reassignLR (IC_LEFT (ic));
2263 /* if result is present && is a true symbol */
2264 if (IC_RESULT (ic) && ic->op != IFX &&
2265 IS_TRUE_SYMOP (IC_RESULT (ic)))
2266 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
2268 /* take away registers from live
2269 ranges that end at this instruction */
2270 deassignLRs (ic, ebbs[i]);
2272 /* some don't need registers */
2273 if (SKIP_IC2 (ic) ||
2274 ic->op == JUMPTABLE ||
2278 (IC_RESULT (ic) && POINTER_SET (ic)))
2281 /* now we need to allocate registers
2282 only for the result */
2285 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
2291 /* if it does not need or is spilt
2292 or is already assigned to registers
2293 or will not live beyond this instructions */
2296 bitVectBitValue (_G.regAssigned, sym->key) ||
2297 sym->liveTo <= ic->seq)
2300 /* if some liverange has been spilt at the block level
2301 and this one live beyond this block then spil this
2303 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
2308 /* if trying to allocate this will cause
2309 a spill and there is nothing to spill
2310 or this one is rematerializable then
2312 willCS = willCauseSpill (sym->nRegs, sym->regType);
2313 spillable = computeSpillable (ic);
2315 (willCS && bitVectIsZero (spillable)))
2323 /* if it has a spillocation & is used less than
2324 all other live ranges then spill this */
2326 if (sym->usl.spillLoc) {
2327 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
2328 allLRs, ebbs[i], ic));
2329 if (leastUsed && leastUsed->used > sym->used) {
2334 /* if none of the liveRanges have a spillLocation then better
2335 to spill this one than anything else already assigned to registers */
2336 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
2337 /* if this is local to this block then we might find a block spil */
2338 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
2346 if (ic->op == RECEIVE)
2347 debugLog ("When I get clever, I'll optimize the receive logic\n");
2349 /* if we need ptr regs for the right side
2351 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
2352 <= (unsigned) PTRSIZE)
2357 /* else we assign registers to it */
2358 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
2360 debugLog (" %d - \n", __LINE__);
2362 bitVectDebugOn(_G.regAssigned, debugF);
2363 for (j = 0; j < sym->nRegs; j++)
2365 if (sym->regType == REG_PTR)
2366 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
2368 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
2370 /* if the allocation failed which means
2371 this was spilt then break */
2375 debugLog (" %d - \n", __LINE__);
2377 /* if it shares registers with operands make sure
2378 that they are in the same position */
2379 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
2380 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
2381 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2382 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
2383 /* do the same for the right operand */
2384 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
2385 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
2386 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
2387 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
2389 debugLog (" %d - \n", __LINE__);
2392 debugLog (" %d - \n", __LINE__);
2401 /* Check for and fix any problems with uninitialized operands */
2402 for (i = 0; i < count; i++)
2406 if (ebbs[i]->noPath &&
2407 (ebbs[i]->entryLabel != entryLabel &&
2408 ebbs[i]->entryLabel != returnLabel))
2411 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2418 verifyRegsAssigned (IC_COND (ic), ic);
2422 if (ic->op == JUMPTABLE)
2424 verifyRegsAssigned (IC_JTCOND (ic), ic);
2428 verifyRegsAssigned (IC_RESULT (ic), ic);
2429 verifyRegsAssigned (IC_LEFT (ic), ic);
2430 verifyRegsAssigned (IC_RIGHT (ic), ic);
2436 /*-----------------------------------------------------------------*/
2437 /* rUmaskForOp :- returns register mask for an operand */
2438 /*-----------------------------------------------------------------*/
2440 rUmaskForOp (operand * op)
2446 debugLog ("%s\n", __FUNCTION__);
2447 /* only temporaries are assigned registers */
2451 sym = OP_SYMBOL (op);
2453 /* if spilt or no registers assigned to it
2455 if (sym->isspilt || !sym->nRegs)
2458 rumask = newBitVect (pic14_nRegs);
2460 for (j = 0; j < sym->nRegs; j++)
2462 rumask = bitVectSetBit (rumask,
2463 sym->regs[j]->rIdx);
2469 /*-----------------------------------------------------------------*/
2470 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
2471 /*-----------------------------------------------------------------*/
2473 regsUsedIniCode (iCode * ic)
2475 bitVect *rmask = newBitVect (pic14_nRegs);
2477 debugLog ("%s\n", __FUNCTION__);
2478 /* do the special cases first */
2481 rmask = bitVectUnion (rmask,
2482 rUmaskForOp (IC_COND (ic)));
2486 /* for the jumptable */
2487 if (ic->op == JUMPTABLE)
2489 rmask = bitVectUnion (rmask,
2490 rUmaskForOp (IC_JTCOND (ic)));
2495 /* of all other cases */
2497 rmask = bitVectUnion (rmask,
2498 rUmaskForOp (IC_LEFT (ic)));
2502 rmask = bitVectUnion (rmask,
2503 rUmaskForOp (IC_RIGHT (ic)));
2506 rmask = bitVectUnion (rmask,
2507 rUmaskForOp (IC_RESULT (ic)));
2513 /*-----------------------------------------------------------------*/
2514 /* createRegMask - for each instruction will determine the regsUsed */
2515 /*-----------------------------------------------------------------*/
2517 createRegMask (eBBlock ** ebbs, int count)
2521 debugLog ("%s\n", __FUNCTION__);
2522 /* for all blocks */
2523 for (i = 0; i < count; i++)
2527 if (ebbs[i]->noPath &&
2528 (ebbs[i]->entryLabel != entryLabel &&
2529 ebbs[i]->entryLabel != returnLabel))
2532 /* for all instructions */
2533 for (ic = ebbs[i]->sch; ic; ic = ic->next)
2538 if (SKIP_IC2 (ic) || !ic->rlive)
2541 /* first mark the registers used in this
2543 ic->rUsed = regsUsedIniCode (ic);
2544 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
2546 /* now create the register mask for those
2547 registers that are in use : this is a
2548 super set of ic->rUsed */
2549 ic->rMask = newBitVect (pic14_nRegs + 1);
2551 /* for all live Ranges alive at this point */
2552 for (j = 1; j < ic->rlive->size; j++)
2557 /* if not alive then continue */
2558 if (!bitVectBitValue (ic->rlive, j))
2561 /* find the live range we are interested in */
2562 if (!(sym = hTabItemWithKey (liveRanges, j)))
2564 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
2565 "createRegMask cannot find live range");
2569 /* if no register assigned to it */
2570 if (!sym->nRegs || sym->isspilt)
2573 /* for all the registers allocated to it */
2574 for (k = 0; k < sym->nRegs; k++)
2577 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
2583 /*-----------------------------------------------------------------*/
2584 /* rematStr - returns the rematerialized string for a remat var */
2585 /*-----------------------------------------------------------------*/
2587 rematStr (symbol * sym)
2590 iCode *ic = sym->rematiCode;
2591 symbol *psym = NULL;
2593 debugLog ("%s\n", __FUNCTION__);
2595 //printf ("%s\n", s);
2597 /* if plus or minus print the right hand side */
2599 if (ic->op == '+' || ic->op == '-') {
2601 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2603 sprintf (s, "(%s %c 0x%04x)",
2604 OP_SYMBOL (IC_LEFT (ric))->rname,
2606 (int) operandLitValue (IC_RIGHT (ic)));
2609 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2611 psym = newSymbol (OP_SYMBOL (IC_LEFT (ric))->rname, 1);
2612 psym->offset = (int) operandLitValue (IC_RIGHT (ic));
2617 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2618 psym = newSymbol (OP_SYMBOL (IC_LEFT (ic))->rname, 1);
2620 //printf ("ralloc.c:%d %s\n", __LINE__,buffer);
2625 /*-----------------------------------------------------------------*/
2626 /* rematStr - returns the rematerialized string for a remat var */
2627 /*-----------------------------------------------------------------*/
2629 rematStr (symbol * sym)
2632 iCode *ic = sym->rematiCode;
2634 debugLog ("%s\n", __FUNCTION__);
2639 /* if plus or minus print the right hand side */
2641 if (ic->op == '+' || ic->op == '-') {
2642 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
2645 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2649 if (ic->op == '+' || ic->op == '-')
2651 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
2652 sprintf (s, "(%s %c 0x%04x)",
2653 OP_SYMBOL (IC_LEFT (ric))->rname,
2655 (int) operandLitValue (IC_RIGHT (ic)));
2658 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
2660 //fprintf(stderr, "ralloc.c:%d OOPS %s\n",__LINE__,s);
2664 /* we reached the end */
2665 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
2669 printf ("%s\n", buffer);
2674 /*-----------------------------------------------------------------*/
2675 /* regTypeNum - computes the type & number of registers required */
2676 /*-----------------------------------------------------------------*/
2684 debugLog ("%s\n", __FUNCTION__);
2685 /* for each live range do */
2686 for (sym = hTabFirstItem (liveRanges, &k); sym;
2687 sym = hTabNextItem (liveRanges, &k)) {
2689 debugLog (" %d - %s\n", __LINE__, sym->rname);
2691 /* if used zero times then no registers needed */
2692 if ((sym->liveTo - sym->liveFrom) == 0)
2696 /* if the live range is a temporary */
2699 debugLog (" %d - itemp register\n", __LINE__);
2701 /* if the type is marked as a conditional */
2702 if (sym->regType == REG_CND)
2705 /* if used in return only then we don't
2708 if (IS_AGGREGATE (sym->type) || sym->isptr)
2709 sym->type = aggrToPtr (sym->type, FALSE);
2710 debugLog (" %d - no reg needed - accumulator used\n", __LINE__);
2716 //if (IS_AGGREGATE (sym->type) || sym->isptr)
2717 // sym->type = aggrToPtr (sym->type, FALSE);
2718 debugLog (" %d - used as a return\n", __LINE__);
2723 /* if the symbol has only one definition &
2724 that definition is a get_pointer and the
2725 pointer we are getting is rematerializable and
2728 if (bitVectnBitsOn (sym->defs) == 1 &&
2729 (ic = hTabItemWithKey (iCodehTab,
2730 bitVectFirstBit (sym->defs))) &&
2733 !IS_BITVAR (sym->etype)) {
2736 debugLog (" %d - \n", __LINE__);
2738 /* if remat in data space */
2739 if (OP_SYMBOL (IC_LEFT (ic))->remat &&
2740 DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER) {
2742 /* create a psuedo symbol & force a spil */
2743 //X symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
2744 symbol *psym = rematStr (OP_SYMBOL (IC_LEFT (ic)));
2745 psym->type = sym->type;
2746 psym->etype = sym->etype;
2747 strcpy (psym->rname, psym->name);
2749 sym->usl.spillLoc = psym;
2753 /* if in data space or idata space then try to
2754 allocate pointer register */
2758 /* if not then we require registers */
2759 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
2760 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
2761 getSize (sym->type));
2764 if(IS_PTR_CONST (sym->type)) {
2765 debugLog (" %d const pointer type requires %d registers, changing to 2\n",__LINE__,sym->nRegs);
2769 if (sym->nRegs > 4) {
2770 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
2771 printTypeChain (sym->type, stderr);
2772 fprintf (stderr, "\n");
2775 /* determine the type of register required */
2776 if (sym->nRegs == 1 &&
2777 IS_PTR (sym->type) &&
2779 sym->regType = REG_PTR;
2781 sym->regType = REG_GPR;
2784 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
2788 /* for the first run we don't provide */
2789 /* registers for true symbols we will */
2790 /* see how things go */
2795 DEFSETFUNC (markRegFree)
2797 ((regs *)item)->isFree = 1;
2802 DEFSETFUNC (deallocReg)
2804 fprintf(stderr,"deallocting register %s\n",((regs *)item)->name);
2805 ((regs *)item)->isFree = 1;
2806 ((regs *)item)->wasUsed = 0;
2810 /*-----------------------------------------------------------------*/
2811 /* freeAllRegs - mark all registers as free */
2812 /*-----------------------------------------------------------------*/
2814 pic14_freeAllRegs ()
2818 debugLog ("%s\n", __FUNCTION__);
2820 applyToSet(dynAllocRegs,markRegFree);
2821 applyToSet(dynStackRegs,markRegFree);
2824 for (i = 0; i < pic14_nRegs; i++)
2825 regspic14[i].isFree = 1;
2829 /*-----------------------------------------------------------------*/
2830 /*-----------------------------------------------------------------*/
2832 pic14_deallocateAllRegs ()
2836 debugLog ("%s\n", __FUNCTION__);
2838 applyToSet(dynAllocRegs,deallocReg);
2841 for (i = 0; i < pic14_nRegs; i++) {
2842 if(regspic14[i].pc_type == PO_GPR_TEMP) {
2843 regspic14[i].isFree = 1;
2844 regspic14[i].wasUsed = 0;
2851 /*-----------------------------------------------------------------*/
2852 /* deallocStackSpil - this will set the stack pointer back */
2853 /*-----------------------------------------------------------------*/
2855 DEFSETFUNC (deallocStackSpil)
2859 debugLog ("%s\n", __FUNCTION__);
2864 /*-----------------------------------------------------------------*/
2865 /* farSpacePackable - returns the packable icode for far variables */
2866 /*-----------------------------------------------------------------*/
2868 farSpacePackable (iCode * ic)
2872 debugLog ("%s\n", __FUNCTION__);
2873 /* go thru till we find a definition for the
2874 symbol on the right */
2875 for (dic = ic->prev; dic; dic = dic->prev)
2878 /* if the definition is a call then no */
2879 if ((dic->op == CALL || dic->op == PCALL) &&
2880 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2885 /* if shift by unknown amount then not */
2886 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2887 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2890 /* if pointer get and size > 1 */
2891 if (POINTER_GET (dic) &&
2892 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2895 if (POINTER_SET (dic) &&
2896 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2899 /* if any three is a true symbol in far space */
2900 if (IC_RESULT (dic) &&
2901 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2902 isOperandInFarSpace (IC_RESULT (dic)))
2905 if (IC_RIGHT (dic) &&
2906 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2907 isOperandInFarSpace (IC_RIGHT (dic)) &&
2908 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2911 if (IC_LEFT (dic) &&
2912 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2913 isOperandInFarSpace (IC_LEFT (dic)) &&
2914 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2917 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2919 if ((dic->op == LEFT_OP ||
2920 dic->op == RIGHT_OP ||
2922 IS_OP_LITERAL (IC_RIGHT (dic)))
2932 /*-----------------------------------------------------------------*/
2933 /* packRegsForAssign - register reduction for assignment */
2934 /*-----------------------------------------------------------------*/
2936 packRegsForAssign (iCode * ic, eBBlock * ebp)
2941 debugLog ("%s\n", __FUNCTION__);
2943 debugAopGet (" result:", IC_RESULT (ic));
2944 debugAopGet (" left:", IC_LEFT (ic));
2945 debugAopGet (" right:", IC_RIGHT (ic));
2947 /* if this is at an absolute address, then get the address. */
2948 if (SPEC_ABSA ( OP_SYM_ETYPE(IC_RESULT(ic))) ) {
2949 if(IS_CONFIG_ADDRESS( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))))) {
2950 debugLog (" %d - found config word declaration\n", __LINE__);
2951 if(IS_VALOP(IC_RIGHT(ic))) {
2952 debugLog (" setting config word to %x\n",
2953 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2954 assignConfigWordValue( SPEC_ADDR ( OP_SYM_ETYPE(IC_RESULT(ic))),
2955 (int) floatFromVal (IC_RIGHT(ic)->operand.valOperand));
2958 /* remove the assignment from the iCode chain. */
2960 remiCodeFromeBBlock (ebp, ic);
2961 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2962 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2969 if (!IS_ITEMP (IC_RESULT (ic))) {
2970 allocDirReg(IC_RESULT (ic));
2971 debugLog (" %d - result is not temp\n", __LINE__);
2974 if (IC_LEFT (ic) && !IS_ITEMP (IC_LEFT (ic))) {
2975 debugLog (" %d - left is not temp, allocating\n", __LINE__);
2976 allocDirReg(IC_LEFT (ic));
2980 if (!IS_ITEMP (IC_RIGHT (ic))) {
2981 debugLog (" %d - not packing - right is not temp\n", __LINE__);
2983 /* only pack if this is not a function pointer */
2984 if (!IS_REF (IC_RIGHT (ic)))
2985 allocDirReg(IC_RIGHT (ic));
2989 if (OP_SYMBOL (IC_RIGHT (ic))->isind ||
2990 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2992 debugLog (" %d - not packing - right side fails \n", __LINE__);
2996 /* if the true symbol is defined in far space or on stack
2997 then we should not since this will increase register pressure */
2998 if (isOperandInFarSpace (IC_RESULT (ic)))
3000 if ((dic = farSpacePackable (ic)))
3006 /* find the definition of iTempNN scanning backwards if we find a
3007 a use of the true symbol before we find the definition then
3009 for (dic = ic->prev; dic; dic = dic->prev)
3012 /* if there is a function call and this is
3013 a parameter & not my parameter then don't pack it */
3014 if ((dic->op == CALL || dic->op == PCALL) &&
3015 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
3016 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
3018 debugLog (" %d - \n", __LINE__);
3026 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
3027 IS_OP_VOLATILE (IC_RESULT (dic)))
3029 debugLog (" %d - dic is VOLATILE \n", __LINE__);
3034 if (IS_SYMOP (IC_RESULT (dic)) &&
3035 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
3037 /* A previous result was assigned to the same register - we'll our definition */
3038 debugLog (" %d - dic result key == ic right key -- pointer set=%c\n",
3039 __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
3040 if (POINTER_SET (dic))
3046 if (IS_SYMOP (IC_RIGHT (dic)) &&
3047 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
3048 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
3050 debugLog (" %d - dic right key == ic rightor result key\n", __LINE__);
3055 if (IS_SYMOP (IC_LEFT (dic)) &&
3056 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
3057 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
3059 debugLog (" %d - dic left key == ic rightor result key\n", __LINE__);
3064 if (POINTER_SET (dic) &&
3065 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
3067 debugLog (" %d - dic result key == ic result key -- pointer set=Y\n",
3075 return 0; /* did not find */
3077 /* if the result is on stack or iaccess then it must be
3078 the same atleast one of the operands */
3079 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
3080 OP_SYMBOL (IC_RESULT (ic))->iaccess)
3083 /* the operation has only one symbol
3084 operator then we can pack */
3085 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
3086 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
3089 if (!((IC_LEFT (dic) &&
3090 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
3092 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
3096 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
3097 debugLog (" replacing with %s\n", OP_SYMBOL (IC_RESULT (dic))->rname);
3098 /* found the definition */
3099 /* replace the result with the result of */
3100 /* this assignment and remove this assignment */
3101 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3102 IC_RESULT (dic) = IC_RESULT (ic);
3104 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
3106 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
3108 /* delete from liverange table also
3109 delete from all the points inbetween and the new
3111 for (sic = dic; sic != ic; sic = sic->next)
3113 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
3114 if (IS_ITEMP (IC_RESULT (dic)))
3115 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
3118 remiCodeFromeBBlock (ebp, ic);
3119 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3120 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3121 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3127 /*-----------------------------------------------------------------*/
3128 /* findAssignToSym : scanning backwards looks for first assig found */
3129 /*-----------------------------------------------------------------*/
3131 findAssignToSym (operand * op, iCode * ic)
3135 debugLog ("%s\n", __FUNCTION__);
3136 for (dic = ic->prev; dic; dic = dic->prev)
3139 /* if definition by assignment */
3140 if (dic->op == '=' &&
3141 !POINTER_SET (dic) &&
3142 IC_RESULT (dic)->key == op->key
3143 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
3147 /* we are interested only if defined in far space */
3148 /* or in stack space in case of + & - */
3150 /* if assigned to a non-symbol then return
3152 if (!IS_SYMOP (IC_RIGHT (dic)))
3155 /* if the symbol is in far space then
3157 if (isOperandInFarSpace (IC_RIGHT (dic)))
3160 /* for + & - operations make sure that
3161 if it is on the stack it is the same
3162 as one of the three operands */
3163 if ((ic->op == '+' || ic->op == '-') &&
3164 OP_SYMBOL (IC_RIGHT (dic))->onStack)
3167 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
3168 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
3169 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
3177 /* if we find an usage then we cannot delete it */
3178 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
3181 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
3184 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
3188 /* now make sure that the right side of dic
3189 is not defined between ic & dic */
3192 iCode *sic = dic->next;
3194 for (; sic != ic; sic = sic->next)
3195 if (IC_RESULT (sic) &&
3196 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
3205 /*-----------------------------------------------------------------*/
3206 /* packRegsForSupport :- reduce some registers for support calls */
3207 /*-----------------------------------------------------------------*/
3209 packRegsForSupport (iCode * ic, eBBlock * ebp)
3213 debugLog ("%s\n", __FUNCTION__);
3214 /* for the left & right operand :- look to see if the
3215 left was assigned a true symbol in far space in that
3216 case replace them */
3217 if (IS_ITEMP (IC_LEFT (ic)) &&
3218 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
3220 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
3226 debugAopGet ("removing left:", IC_LEFT (ic));
3228 /* found it we need to remove it from the
3230 for (sic = dic; sic != ic; sic = sic->next)
3231 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
3233 IC_LEFT (ic)->operand.symOperand =
3234 IC_RIGHT (dic)->operand.symOperand;
3235 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3236 remiCodeFromeBBlock (ebp, dic);
3237 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3238 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3242 /* do the same for the right operand */
3245 IS_ITEMP (IC_RIGHT (ic)) &&
3246 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
3248 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
3254 /* if this is a subtraction & the result
3255 is a true symbol in far space then don't pack */
3256 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
3258 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
3259 if (IN_FARSPACE (SPEC_OCLS (etype)))
3263 debugAopGet ("removing right:", IC_RIGHT (ic));
3265 /* found it we need to remove it from the
3267 for (sic = dic; sic != ic; sic = sic->next)
3268 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
3270 IC_RIGHT (ic)->operand.symOperand =
3271 IC_RIGHT (dic)->operand.symOperand;
3272 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
3274 remiCodeFromeBBlock (ebp, dic);
3275 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3276 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3283 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
3286 /*-----------------------------------------------------------------*/
3287 /* packRegsForOneuse : - will reduce some registers for single Use */
3288 /*-----------------------------------------------------------------*/
3290 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
3295 debugLog ("%s\n", __FUNCTION__);
3296 /* if returning a literal then do nothing */
3300 /* only upto 2 bytes since we cannot predict
3301 the usage of b, & acc */
3302 if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
3307 /* this routine will mark the a symbol as used in one
3308 instruction use only && if the definition is local
3309 (ie. within the basic block) && has only one definition &&
3310 that definition is either a return value from a
3311 function or does not contain any variables in
3313 uses = bitVectCopy (OP_USES (op));
3314 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
3315 if (!bitVectIsZero (uses)) /* has other uses */
3318 /* if it has only one defintion */
3319 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
3320 return NULL; /* has more than one definition */
3322 /* get that definition */
3324 hTabItemWithKey (iCodehTab,
3325 bitVectFirstBit (OP_DEFS (op)))))
3328 /* found the definition now check if it is local */
3329 if (dic->seq < ebp->fSeq ||
3330 dic->seq > ebp->lSeq)
3331 return NULL; /* non-local */
3333 /* now check if it is the return from
3335 if (dic->op == CALL || dic->op == PCALL)
3337 if (ic->op != SEND && ic->op != RETURN &&
3338 !POINTER_SET(ic) && !POINTER_GET(ic))
3340 OP_SYMBOL (op)->ruonly = 1;
3347 /* otherwise check that the definition does
3348 not contain any symbols in far space */
3349 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3350 isOperandInFarSpace (IC_RIGHT (dic)) ||
3351 IS_OP_RUONLY (IC_LEFT (ic)) ||
3352 IS_OP_RUONLY (IC_RIGHT (ic)))
3357 /* if pointer set then make sure the pointer
3359 if (POINTER_SET (dic) &&
3360 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3363 if (POINTER_GET (dic) &&
3364 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3369 /* also make sure the intervenening instructions
3370 don't have any thing in far space */
3371 for (dic = dic->next; dic && dic != ic; dic = dic->next)
3374 /* if there is an intervening function call then no */
3375 if (dic->op == CALL || dic->op == PCALL)
3377 /* if pointer set then make sure the pointer
3379 if (POINTER_SET (dic) &&
3380 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
3383 if (POINTER_GET (dic) &&
3384 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
3387 /* if address of & the result is remat then okay */
3388 if (dic->op == ADDRESS_OF &&
3389 OP_SYMBOL (IC_RESULT (dic))->remat)
3392 /* if operand has size of three or more & this
3393 operation is a '*','/' or '%' then 'b' may
3395 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
3396 getSize (operandType (op)) >= 3)
3399 /* if left or right or result is in far space */
3400 if (isOperandInFarSpace (IC_LEFT (dic)) ||
3401 isOperandInFarSpace (IC_RIGHT (dic)) ||
3402 isOperandInFarSpace (IC_RESULT (dic)) ||
3403 IS_OP_RUONLY (IC_LEFT (dic)) ||
3404 IS_OP_RUONLY (IC_RIGHT (dic)) ||
3405 IS_OP_RUONLY (IC_RESULT (dic)))
3411 OP_SYMBOL (op)->ruonly = 1;
3416 /*-----------------------------------------------------------------*/
3417 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
3418 /*-----------------------------------------------------------------*/
3420 isBitwiseOptimizable (iCode * ic)
3422 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
3423 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
3425 debugLog ("%s\n", __FUNCTION__);
3426 /* bitwise operations are considered optimizable
3427 under the following conditions (Jean-Louis VERN)
3439 if (IS_LITERAL (rtype) ||
3440 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
3446 /*-----------------------------------------------------------------*/
3447 /* packRegsForAccUse - pack registers for acc use */
3448 /*-----------------------------------------------------------------*/
3450 packRegsForAccUse (iCode * ic)
3454 debugLog ("%s\n", __FUNCTION__);
3456 /* if this is an aggregate, e.g. a one byte char array */
3457 if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
3460 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3462 /* if + or - then it has to be one byte result */
3463 if ((ic->op == '+' || ic->op == '-')
3464 && getSize (operandType (IC_RESULT (ic))) > 1)
3467 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3468 /* if shift operation make sure right side is not a literal */
3469 if (ic->op == RIGHT_OP &&
3470 (isOperandLiteral (IC_RIGHT (ic)) ||
3471 getSize (operandType (IC_RESULT (ic))) > 1))
3474 if (ic->op == LEFT_OP &&
3475 (isOperandLiteral (IC_RIGHT (ic)) ||
3476 getSize (operandType (IC_RESULT (ic))) > 1))
3479 if (IS_BITWISE_OP (ic) &&
3480 getSize (operandType (IC_RESULT (ic))) > 1)
3484 /* has only one definition */
3485 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
3488 /* has only one use */
3489 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
3492 /* and the usage immediately follows this iCode */
3493 if (!(uic = hTabItemWithKey (iCodehTab,
3494 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
3497 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3498 if (ic->next != uic)
3501 /* if it is a conditional branch then we definitely can */
3505 if (uic->op == JUMPTABLE)
3508 /* if the usage is not is an assignment
3509 or an arithmetic / bitwise / shift operation then not */
3510 if (POINTER_SET (uic) &&
3511 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
3514 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3515 if (uic->op != '=' &&
3516 !IS_ARITHMETIC_OP (uic) &&
3517 !IS_BITWISE_OP (uic) &&
3518 uic->op != LEFT_OP &&
3519 uic->op != RIGHT_OP)
3522 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3523 /* if used in ^ operation then make sure right is not a
3525 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
3528 /* if shift operation make sure right side is not a literal */
3529 if (uic->op == RIGHT_OP &&
3530 (isOperandLiteral (IC_RIGHT (uic)) ||
3531 getSize (operandType (IC_RESULT (uic))) > 1))
3534 if (uic->op == LEFT_OP &&
3535 (isOperandLiteral (IC_RIGHT (uic)) ||
3536 getSize (operandType (IC_RESULT (uic))) > 1))
3539 /* make sure that the result of this icode is not on the
3540 stack, since acc is used to compute stack offset */
3541 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
3542 OP_SYMBOL (IC_RESULT (uic))->onStack)
3545 /* if either one of them in far space then we cannot */
3546 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3547 isOperandInFarSpace (IC_LEFT (uic))) ||
3548 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3549 isOperandInFarSpace (IC_RIGHT (uic))))
3552 /* if the usage has only one operand then we can */
3553 if (IC_LEFT (uic) == NULL ||
3554 IC_RIGHT (uic) == NULL)
3557 /* make sure this is on the left side if not
3558 a '+' since '+' is commutative */
3559 if (ic->op != '+' &&
3560 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
3563 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3564 /* if one of them is a literal then we can */
3565 if ( ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
3566 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic)))) &&
3567 (getSize (operandType (IC_RESULT (uic))) <= 1))
3569 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3573 debugLog (" %s:%d\n", __FUNCTION__,__LINE__);
3574 /* if the other one is not on stack then we can */
3575 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
3576 (IS_ITEMP (IC_RIGHT (uic)) ||
3577 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
3578 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
3581 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
3582 (IS_ITEMP (IC_LEFT (uic)) ||
3583 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
3584 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
3590 debugLog ("%s - Yes we are using the accumulator\n", __FUNCTION__);
3591 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
3596 /*-----------------------------------------------------------------*/
3597 /* packForPush - hueristics to reduce iCode for pushing */
3598 /*-----------------------------------------------------------------*/
3600 packForReceive (iCode * ic, eBBlock * ebp)
3604 debugLog ("%s\n", __FUNCTION__);
3605 debugAopGet (" result:", IC_RESULT (ic));
3606 debugAopGet (" left:", IC_LEFT (ic));
3607 debugAopGet (" right:", IC_RIGHT (ic));
3612 for (dic = ic->next; dic; dic = dic->next)
3617 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
3618 debugLog (" used on left\n");
3619 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
3620 debugLog (" used on right\n");
3621 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
3622 debugLog (" used on result\n");
3624 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
3625 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
3630 debugLog (" hey we can remove this unnecessary assign\n");
3632 /*-----------------------------------------------------------------*/
3633 /* packForPush - hueristics to reduce iCode for pushing */
3634 /*-----------------------------------------------------------------*/
3636 packForPush (iCode * ic, eBBlock * ebp)
3640 debugLog ("%s\n", __FUNCTION__);
3641 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
3644 /* must have only definition & one usage */
3645 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
3646 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
3649 /* find the definition */
3650 if (!(dic = hTabItemWithKey (iCodehTab,
3651 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
3654 if (dic->op != '=' || POINTER_SET (dic))
3657 /* we now we know that it has one & only one def & use
3658 and the that the definition is an assignment */
3659 IC_LEFT (ic) = IC_RIGHT (dic);
3661 remiCodeFromeBBlock (ebp, dic);
3662 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3663 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
3666 void printSymType(char * str, sym_link *sl)
3668 debugLog (" %s Symbol type: ",str);
3669 printTypeChain( sl, debugF);
3674 /*-----------------------------------------------------------------*/
3675 /* some debug code to print the symbol S_TYPE. Note that
3676 * the function checkSClass in src/SDCCsymt.c dinks with
3677 * the S_TYPE in ways the PIC port doesn't fully like...*/
3678 /*-----------------------------------------------------------------*/
3679 void isData(sym_link *sl)
3689 for ( ; sl; sl=sl->next) {
3691 switch (SPEC_SCLS(sl)) {
3693 case S_DATA: fprintf (of, "data "); break;
3694 case S_XDATA: fprintf (of, "xdata "); break;
3695 case S_SFR: fprintf (of, "sfr "); break;
3696 case S_SBIT: fprintf (of, "sbit "); break;
3697 case S_CODE: fprintf (of, "code "); break;
3698 case S_IDATA: fprintf (of, "idata "); break;
3699 case S_PDATA: fprintf (of, "pdata "); break;
3700 case S_LITERAL: fprintf (of, "literal "); break;
3701 case S_STACK: fprintf (of, "stack "); break;
3702 case S_XSTACK: fprintf (of, "xstack "); break;
3703 case S_BIT: fprintf (of, "bit "); break;
3704 case S_EEPROM: fprintf (of, "eeprom "); break;
3713 /*-----------------------------------------------------------------*/
3714 /* packRegisters - does some transformations to reduce register */
3716 /*-----------------------------------------------------------------*/
3718 packRegisters (eBBlock * ebp)
3723 debugLog ("%s\n", __FUNCTION__);
3729 /* look for assignments of the form */
3730 /* iTempNN = TRueSym (someoperation) SomeOperand */
3732 /* TrueSym := iTempNN:1 */
3733 for (ic = ebp->sch; ic; ic = ic->next)
3736 /* find assignment of the form TrueSym := iTempNN:1 */
3737 if (ic->op == '=' && !POINTER_SET (ic))
3738 change += packRegsForAssign (ic, ebp);
3742 if (POINTER_SET (ic))
3743 debugLog ("pointer is set\n");
3744 debugAopGet (" result:", IC_RESULT (ic));
3745 debugAopGet (" left:", IC_LEFT (ic));
3746 debugAopGet (" right:", IC_RIGHT (ic));
3755 for (ic = ebp->sch; ic; ic = ic->next) {
3757 if(IS_SYMOP ( IC_LEFT(ic))) {
3758 sym_link *etype = getSpec (operandType (IC_LEFT (ic)));
3760 debugAopGet (" left:", IC_LEFT (ic));
3761 if(IS_PTR_CONST(OP_SYMBOL(IC_LEFT(ic))->type))
3762 debugLog (" is a pointer\n");
3764 if(IS_OP_VOLATILE(IC_LEFT(ic)))
3765 debugLog (" is volatile\n");
3769 printSymType(" ", OP_SYMBOL(IC_LEFT(ic))->type);
3772 if(IS_SYMOP ( IC_RIGHT(ic))) {
3773 debugAopGet (" right:", IC_RIGHT (ic));
3774 printSymType(" ", OP_SYMBOL(IC_RIGHT(ic))->type);
3777 if(IS_SYMOP ( IC_RESULT(ic))) {
3778 debugAopGet (" result:", IC_RESULT (ic));
3779 printSymType(" ", OP_SYMBOL(IC_RESULT(ic))->type);
3782 if (POINTER_SET (ic))
3783 debugLog (" %d - Pointer set\n", __LINE__);
3786 /* if this is an itemp & result of a address of a true sym
3787 then mark this as rematerialisable */
3788 if (ic->op == ADDRESS_OF &&
3789 IS_ITEMP (IC_RESULT (ic)) &&
3790 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
3791 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3792 !OP_SYMBOL (IC_LEFT (ic))->onStack)
3795 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
3797 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3798 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3799 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3803 /* if straight assignment then carry remat flag if
3804 this is the only definition */
3805 if (ic->op == '=' &&
3806 !POINTER_SET (ic) &&
3807 IS_SYMOP (IC_RIGHT (ic)) &&
3808 OP_SYMBOL (IC_RIGHT (ic))->remat &&
3809 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
3811 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
3813 OP_SYMBOL (IC_RESULT (ic))->remat =
3814 OP_SYMBOL (IC_RIGHT (ic))->remat;
3815 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
3816 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
3819 /* if this is a +/- operation with a rematerizable
3820 then mark this as rematerializable as well */
3821 if ((ic->op == '+' || ic->op == '-') &&
3822 (IS_SYMOP (IC_LEFT (ic)) &&
3823 IS_ITEMP (IC_RESULT (ic)) &&
3824 OP_SYMBOL (IC_LEFT (ic))->remat &&
3825 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
3826 IS_OP_LITERAL (IC_RIGHT (ic))))
3828 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
3830 operandLitValue (IC_RIGHT (ic));
3831 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
3832 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
3833 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
3836 /* mark the pointer usages */
3837 if (POINTER_SET (ic))
3839 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
3840 debugLog (" marking as a pointer (set) =>");
3841 debugAopGet (" result:", IC_RESULT (ic));
3843 if (POINTER_GET (ic))
3845 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
3846 debugLog (" marking as a pointer (get) =>");
3847 debugAopGet (" left:", IC_LEFT (ic));
3852 /* if we are using a symbol on the stack
3853 then we should say pic14_ptrRegReq */
3854 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
3855 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
3856 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
3857 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
3858 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
3859 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
3862 if (IS_SYMOP (IC_LEFT (ic)))
3863 pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
3864 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
3865 if (IS_SYMOP (IC_RIGHT (ic)))
3866 pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
3867 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
3868 if (IS_SYMOP (IC_RESULT (ic)))
3869 pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
3870 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
3873 debugLog (" %d - pointer reg req = %d\n", __LINE__,pic14_ptrRegReq);
3877 /* if the condition of an if instruction
3878 is defined in the previous instruction then
3879 mark the itemp as a conditional */
3880 if ((IS_CONDITIONAL (ic) ||
3881 ((ic->op == BITWISEAND ||
3884 isBitwiseOptimizable (ic))) &&
3885 ic->next && ic->next->op == IFX &&
3886 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
3887 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
3890 debugLog (" %d\n", __LINE__);
3891 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
3895 /* reduce for support function calls */
3896 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
3897 packRegsForSupport (ic, ebp);
3899 /* if a parameter is passed, it's in W, so we may not
3900 need to place a copy in a register */
3901 if (ic->op == RECEIVE)
3902 packForReceive (ic, ebp);
3904 /* some cases the redundant moves can
3905 can be eliminated for return statements */
3906 if ((ic->op == RETURN || ic->op == SEND) &&
3907 !isOperandInFarSpace (IC_LEFT (ic)) &&
3909 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3911 /* if pointer set & left has a size more than
3912 one and right is not in far space */
3913 if (POINTER_SET (ic) &&
3914 !isOperandInFarSpace (IC_RIGHT (ic)) &&
3915 !OP_SYMBOL (IC_RESULT (ic))->remat &&
3916 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
3917 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
3919 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
3921 /* if pointer get */
3922 if (POINTER_GET (ic) &&
3923 !isOperandInFarSpace (IC_RESULT (ic)) &&
3924 !OP_SYMBOL (IC_LEFT (ic))->remat &&
3925 !IS_OP_RUONLY (IC_RESULT (ic)) &&
3926 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
3928 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
3931 /* if this is cast for intergral promotion then
3932 check if only use of the definition of the
3933 operand being casted/ if yes then replace
3934 the result of that arithmetic operation with
3935 this result and get rid of the cast */
3936 if (ic->op == CAST) {
3938 sym_link *fromType = operandType (IC_RIGHT (ic));
3939 sym_link *toType = operandType (IC_LEFT (ic));
3941 debugLog (" %d - casting\n", __LINE__);
3943 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
3944 getSize (fromType) != getSize (toType)) {
3947 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3950 if (IS_ARITHMETIC_OP (dic)) {
3952 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3953 IC_RESULT (dic) = IC_RESULT (ic);
3954 remiCodeFromeBBlock (ebp, ic);
3955 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3956 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3957 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3961 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3965 /* if the type from and type to are the same
3966 then if this is the only use then packit */
3967 if (compareType (operandType (IC_RIGHT (ic)),
3968 operandType (IC_LEFT (ic))) == 1) {
3970 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3973 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3974 IC_RESULT (dic) = IC_RESULT (ic);
3975 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3976 remiCodeFromeBBlock (ebp, ic);
3977 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3978 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3986 iTempNN := (some variable in farspace) V1
3991 if (ic->op == IPUSH)
3993 packForPush (ic, ebp);
3997 /* pack registers for accumulator use, when the
3998 result of an arithmetic or bit wise operation
3999 has only one use, that use is immediately following
4000 the defintion and the using iCode has only one
4001 operand or has two operands but one is literal &
4002 the result of that operation is not on stack then
4003 we can leave the result of this operation in acc:b
4005 if ((IS_ARITHMETIC_OP (ic)
4007 || IS_BITWISE_OP (ic)
4009 || ic->op == LEFT_OP || ic->op == RIGHT_OP
4012 IS_ITEMP (IC_RESULT (ic)) &&
4013 getSize (operandType (IC_RESULT (ic))) <= 2)
4015 packRegsForAccUse (ic);
4021 dumpEbbsToDebug (eBBlock ** ebbs, int count)
4025 if (!debug || !debugF)
4028 for (i = 0; i < count; i++)
4030 fprintf (debugF, "\n----------------------------------------------------------------\n");
4031 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
4032 ebbs[i]->entryLabel->name,
4035 ebbs[i]->isLastInLoop);
4036 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
4041 fprintf (debugF, "visited %d : hasFcall = %d\n",
4045 fprintf (debugF, "\ndefines bitVector :");
4046 bitVectDebugOn (ebbs[i]->defSet, debugF);
4047 fprintf (debugF, "\nlocal defines bitVector :");
4048 bitVectDebugOn (ebbs[i]->ldefs, debugF);
4049 fprintf (debugF, "\npointers Set bitvector :");
4050 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
4051 fprintf (debugF, "\nin pointers Set bitvector :");
4052 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
4053 fprintf (debugF, "\ninDefs Set bitvector :");
4054 bitVectDebugOn (ebbs[i]->inDefs, debugF);
4055 fprintf (debugF, "\noutDefs Set bitvector :");
4056 bitVectDebugOn (ebbs[i]->outDefs, debugF);
4057 fprintf (debugF, "\nusesDefs Set bitvector :");
4058 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
4059 fprintf (debugF, "\n----------------------------------------------------------------\n");
4060 printiCChain (ebbs[i]->sch, debugF);
4063 /*-----------------------------------------------------------------*/
4064 /* assignRegisters - assigns registers to each live range as need */
4065 /*-----------------------------------------------------------------*/
4067 pic14_assignRegisters (eBBlock ** ebbs, int count)
4072 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
4073 debugLog ("\nebbs before optimizing:\n");
4074 dumpEbbsToDebug (ebbs, count);
4076 setToNull ((void *) &_G.funcrUsed);
4077 pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
4080 /* change assignments this will remove some
4081 live ranges reducing some register pressure */
4082 for (i = 0; i < count; i++)
4083 packRegisters (ebbs[i]);
4090 debugLog("dir registers allocated so far:\n");
4091 reg = hTabFirstItem(dynDirectRegNames, &hkey);
4094 debugLog(" -- #%d reg = %s key %d, rIdx = %d, size %d\n",i++,reg->name,hkey, reg->rIdx,reg->size);
4095 reg = hTabNextItem(dynDirectRegNames, &hkey);
4100 if (options.dump_pack)
4101 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
4103 /* first determine for each live range the number of
4104 registers & the type of registers required for each */
4107 /* and serially allocate registers */
4108 serialRegAssign (ebbs, count);
4110 /* if stack was extended then tell the user */
4113 /* werror(W_TOOMANY_SPILS,"stack", */
4114 /* _G.stackExtend,currFunc->name,""); */
4120 /* werror(W_TOOMANY_SPILS,"data space", */
4121 /* _G.dataExtend,currFunc->name,""); */
4125 /* after that create the register mask
4126 for each of the instruction */
4127 createRegMask (ebbs, count);
4129 /* redo that offsets for stacked automatic variables */
4130 redoStackOffsets ();
4132 if (options.dump_rassgn)
4133 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
4135 /* now get back the chain */
4136 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
4138 debugLog ("ebbs after optimizing:\n");
4139 dumpEbbsToDebug (ebbs, count);
4144 /* free up any _G.stackSpil locations allocated */
4145 applyToSet (_G.stackSpil, deallocStackSpil);
4147 setToNull ((void *) &_G.stackSpil);
4148 setToNull ((void *) &_G.spiltSet);
4149 /* mark all registers as free */
4150 //pic14_freeAllRegs ();
4152 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");