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 /*-----------------------------------------------------------------*/
33 /* At this point we start getting processor specific although */
34 /* some routines are non-processor specific & can be reused when */
35 /* targetting other processors. The decision for this will have */
36 /* to be made on a routine by routine basis */
37 /* routines used to pack registers are most definitely not reusable */
38 /* since the pack the registers depending strictly on the MCU */
39 /*-----------------------------------------------------------------*/
41 extern void genpic14Code (iCode *);
51 bitVect *funcrUsed; /* registers used in a function */
57 /* Shared with gen.c */
58 int pic14_ptrRegReq; /* one byte pointer register required */
64 {REG_GPR, PO_GPR_TEMP, 0x0C, "r0x0C", "r0x0C", 0x0C, 1, 0},
65 {REG_GPR, PO_GPR_TEMP, 0x0D, "r0x0D", "r0x0C", 0x0D, 1, 0},
66 {REG_GPR, PO_GPR_TEMP, 0x0E, "r0x0E", "r0x0C", 0x0E, 1, 0},
67 {REG_GPR, PO_GPR_TEMP, 0x0F, "r0x0F", "r0x0C", 0x0F, 1, 0},
68 {REG_GPR, PO_GPR_TEMP, 0x10, "r0x10", "r0x10", 0x10, 1, 0},
69 {REG_GPR, PO_GPR_TEMP, 0x11, "r0x11", "r0x11", 0x11, 1, 0},
70 {REG_GPR, PO_GPR_TEMP, 0x12, "r0x12", "r0x12", 0x12, 1, 0},
71 {REG_GPR, PO_GPR_TEMP, 0x13, "r0x13", "r0x13", 0x13, 1, 0},
72 {REG_GPR, PO_GPR_TEMP, 0x14, "r0x14", "r0x14", 0x14, 1, 0},
73 {REG_GPR, PO_GPR_TEMP, 0x15, "r0x15", "r0x15", 0x15, 1, 0},
74 {REG_GPR, PO_GPR_TEMP, 0x16, "r0x16", "r0x16", 0x16, 1, 0},
75 {REG_GPR, PO_GPR_TEMP, 0x17, "r0x17", "r0x17", 0x17, 1, 0},
76 {REG_GPR, PO_GPR_TEMP, 0x18, "r0x18", "r0x18", 0x18, 1, 0},
77 {REG_GPR, PO_GPR_TEMP, 0x19, "r0x19", "r0x19", 0x19, 1, 0},
78 {REG_GPR, PO_GPR_TEMP, 0x1A, "r0x1A", "r0x1A", 0x1A, 1, 0},
79 {REG_GPR, PO_GPR_TEMP, 0x1B, "r0x1B", "r0x1B", 0x1B, 1, 0},
80 {REG_GPR, PO_GPR_TEMP, 0x1C, "r0x1C", "r0x1C", 0x1C, 1, 0},
81 {REG_GPR, PO_GPR_TEMP, 0x1D, "r0x1D", "r0x1D", 0x1D, 1, 0},
82 {REG_GPR, PO_GPR_TEMP, 0x1E, "r0x1E", "r0x1E", 0x1E, 1, 0},
83 {REG_GPR, PO_GPR_TEMP, 0x1F, "r0x1F", "r0x1F", 0x1F, 1, 0},
84 {REG_PTR, PO_FSR, 4, "FSR", "FSR", 4, 1, 0},
88 int pic14_nRegs = sizeof (regspic14) / sizeof (regs);
89 static void spillThis (symbol *);
91 static FILE *debugF = NULL;
92 /*-----------------------------------------------------------------*/
93 /* debugLog - open a file for debugging information */
94 /*-----------------------------------------------------------------*/
95 //static void debugLog(char *inst,char *fmt, ...)
97 debugLog (char *fmt,...)
99 static int append = 0; // First time through, open the file without append.
102 //char *bufferP=buffer;
105 if (!debug || !srcFileName)
111 /* create the file name */
112 strcpy (buffer, srcFileName);
113 strcat (buffer, ".d");
115 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
117 werror (E_FILE_OPEN_ERR, buffer);
120 append = 1; // Next time debubLog is called, we'll append the debug info
126 vsprintf (buffer, fmt, ap);
128 fprintf (debugF, "%s", buffer);
130 while (isspace(*bufferP)) bufferP++;
132 if (bufferP && *bufferP)
133 lineCurr = (lineCurr ?
134 connectLine(lineCurr,newLineNode(lb)) :
135 (lineHead = newLineNode(lb)));
136 lineCurr->isInline = _G.inLine;
137 lineCurr->isDebug = _G.debugLine;
147 fputc ('\n', debugF);
149 /*-----------------------------------------------------------------*/
150 /* debugLogClose - closes the debug log file (if opened) */
151 /*-----------------------------------------------------------------*/
161 #define AOP(op) op->aop
164 debugAopGet (char *str, operand * op)
169 printOperand (op, debugF);
177 decodeOp (unsigned int op)
180 if (op < 128 && op > ' ')
182 buffer[0] = (op & 0xff);
196 return "STRING_LITERAL";
232 return "LEFT_ASSIGN";
234 return "RIGHT_ASSIGN";
363 case GET_VALUE_AT_ADDRESS:
364 return "GET_VALUE_AT_ADDRESS";
382 return "ENDFUNCTION";
406 sprintf (buffer, "unkown op %d %c", op, op & 0xff);
409 /*-----------------------------------------------------------------*/
410 /*-----------------------------------------------------------------*/
412 debugLogRegType (short type)
425 sprintf (buffer, "unkown reg type %d", type);
429 /*-----------------------------------------------------------------*/
430 /* allocReg - allocates register of given type */
431 /*-----------------------------------------------------------------*/
433 allocReg (short type)
437 debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
439 for (i = 0; i < pic14_nRegs; i++)
442 /* if type is given as 0 then any
443 free register will do */
447 regspic14[i].isFree = 0;
448 regspic14[i].wasUsed = 1;
451 bitVectSetBit (currFunc->regsUsed, i);
452 debugLog (" returning %s\n", regspic14[i].name);
453 return ®spic14[i];
455 /* other wise look for specific type
457 if (regspic14[i].isFree &&
458 regspic14[i].type == type)
460 regspic14[i].isFree = 0;
461 regspic14[i].wasUsed = 1;
464 bitVectSetBit (currFunc->regsUsed, i);
465 debugLog (" returning %s\n", regspic14[i].name);
466 return ®spic14[i];
472 /*-----------------------------------------------------------------*/
473 /* pic14_regWithIdx - returns pointer to register wit index number */
474 /*-----------------------------------------------------------------*/
476 pic14_regWithIdx (int idx)
480 debugLog ("%s\n", __FUNCTION__);
482 for (i = 0; i < pic14_nRegs; i++)
483 if (regspic14[i].rIdx == idx)
484 return ®spic14[i];
486 return ®spic14[0];
488 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
489 "regWithIdx not found");
493 /*-----------------------------------------------------------------*/
494 /*-----------------------------------------------------------------*/
496 pic14_findFreeReg(void)
500 for (i = 0; i < pic14_nRegs; i++)
501 if (regspic14[i].isFree)
502 return ®spic14[i];
506 /*-----------------------------------------------------------------*/
507 /* freeReg - frees a register */
508 /*-----------------------------------------------------------------*/
512 debugLog ("%s\n", __FUNCTION__);
517 /*-----------------------------------------------------------------*/
518 /* nFreeRegs - returns number of free registers */
519 /*-----------------------------------------------------------------*/
526 debugLog ("%s\n", __FUNCTION__);
527 for (i = 0; i < pic14_nRegs; i++)
528 if (regspic14[i].isFree && regspic14[i].type == type)
533 /*-----------------------------------------------------------------*/
534 /* nfreeRegsType - free registers with type */
535 /*-----------------------------------------------------------------*/
537 nfreeRegsType (int type)
540 debugLog ("%s\n", __FUNCTION__);
543 if ((nfr = nFreeRegs (type)) == 0)
544 return nFreeRegs (REG_GPR);
547 return nFreeRegs (type);
551 /*-----------------------------------------------------------------*/
552 /* allDefsOutOfRange - all definitions are out of a range */
553 /*-----------------------------------------------------------------*/
555 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
559 debugLog ("%s\n", __FUNCTION__);
563 for (i = 0; i < defs->size; i++)
567 if (bitVectBitValue (defs, i) &&
568 (ic = hTabItemWithKey (iCodehTab, i)) &&
569 (ic->seq >= fseq && ic->seq <= toseq))
578 /*-----------------------------------------------------------------*/
579 /* computeSpillable - given a point find the spillable live ranges */
580 /*-----------------------------------------------------------------*/
582 computeSpillable (iCode * ic)
586 debugLog ("%s\n", __FUNCTION__);
587 /* spillable live ranges are those that are live at this
588 point . the following categories need to be subtracted
590 a) - those that are already spilt
591 b) - if being used by this one
592 c) - defined by this one */
594 spillable = bitVectCopy (ic->rlive);
596 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
598 bitVectCplAnd (spillable, ic->uses); /* used in this one */
599 bitVectUnSetBit (spillable, ic->defKey);
600 spillable = bitVectIntersect (spillable, _G.regAssigned);
605 /*-----------------------------------------------------------------*/
606 /* noSpilLoc - return true if a variable has no spil location */
607 /*-----------------------------------------------------------------*/
609 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
611 debugLog ("%s\n", __FUNCTION__);
612 return (sym->usl.spillLoc ? 0 : 1);
615 /*-----------------------------------------------------------------*/
616 /* hasSpilLoc - will return 1 if the symbol has spil location */
617 /*-----------------------------------------------------------------*/
619 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
621 debugLog ("%s\n", __FUNCTION__);
622 return (sym->usl.spillLoc ? 1 : 0);
625 /*-----------------------------------------------------------------*/
626 /* directSpilLoc - will return 1 if the splilocation is in direct */
627 /*-----------------------------------------------------------------*/
629 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
631 debugLog ("%s\n", __FUNCTION__);
632 if (sym->usl.spillLoc &&
633 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
639 /*-----------------------------------------------------------------*/
640 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
641 /* but is not used as a pointer */
642 /*-----------------------------------------------------------------*/
644 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
646 debugLog ("%s\n", __FUNCTION__);
647 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
650 /*-----------------------------------------------------------------*/
651 /* rematable - will return 1 if the remat flag is set */
652 /*-----------------------------------------------------------------*/
654 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
656 debugLog ("%s\n", __FUNCTION__);
660 /*-----------------------------------------------------------------*/
661 /* notUsedInBlock - not used in this block */
662 /*-----------------------------------------------------------------*/
664 notUsedInBlock (symbol * sym, eBBlock * ebp, iCode * ic)
666 debugLog ("%s\n", __FUNCTION__);
667 return (!bitVectBitsInCommon (sym->defs, ebp->usesDefs) &&
668 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
669 /* return (!bitVectBitsInCommon(sym->defs,ebp->usesDefs)); */
672 /*-----------------------------------------------------------------*/
673 /* notUsedInRemaining - not used or defined in remain of the block */
674 /*-----------------------------------------------------------------*/
676 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
678 debugLog ("%s\n", __FUNCTION__);
679 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
680 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
683 /*-----------------------------------------------------------------*/
684 /* allLRs - return true for all */
685 /*-----------------------------------------------------------------*/
687 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
689 debugLog ("%s\n", __FUNCTION__);
693 /*-----------------------------------------------------------------*/
694 /* liveRangesWith - applies function to a given set of live range */
695 /*-----------------------------------------------------------------*/
697 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
698 eBBlock * ebp, iCode * ic)
703 debugLog ("%s\n", __FUNCTION__);
704 if (!lrs || !lrs->size)
707 for (i = 1; i < lrs->size; i++)
710 if (!bitVectBitValue (lrs, i))
713 /* if we don't find it in the live range
714 hash table we are in serious trouble */
715 if (!(sym = hTabItemWithKey (liveRanges, i)))
717 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
718 "liveRangesWith could not find liveRange");
722 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
723 addSetHead (&rset, sym);
730 /*-----------------------------------------------------------------*/
731 /* leastUsedLR - given a set determines which is the least used */
732 /*-----------------------------------------------------------------*/
734 leastUsedLR (set * sset)
736 symbol *sym = NULL, *lsym = NULL;
738 debugLog ("%s\n", __FUNCTION__);
739 sym = lsym = setFirstItem (sset);
744 for (; lsym; lsym = setNextItem (sset))
747 /* if usage is the same then prefer
748 the spill the smaller of the two */
749 if (lsym->used == sym->used)
750 if (getSize (lsym->type) < getSize (sym->type))
754 if (lsym->used < sym->used)
759 setToNull ((void **) &sset);
764 /*-----------------------------------------------------------------*/
765 /* noOverLap - will iterate through the list looking for over lap */
766 /*-----------------------------------------------------------------*/
768 noOverLap (set * itmpStack, symbol * fsym)
771 debugLog ("%s\n", __FUNCTION__);
774 for (sym = setFirstItem (itmpStack); sym;
775 sym = setNextItem (itmpStack))
777 if (sym->liveTo > fsym->liveFrom)
785 /*-----------------------------------------------------------------*/
786 /* isFree - will return 1 if the a free spil location is found */
787 /*-----------------------------------------------------------------*/
792 V_ARG (symbol **, sloc);
793 V_ARG (symbol *, fsym);
795 debugLog ("%s\n", __FUNCTION__);
796 /* if already found */
800 /* if it is free && and the itmp assigned to
801 this does not have any overlapping live ranges
802 with the one currently being assigned and
803 the size can be accomodated */
805 noOverLap (sym->usl.itmpStack, fsym) &&
806 getSize (sym->type) >= getSize (fsym->type))
815 /*-----------------------------------------------------------------*/
816 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
817 /*-----------------------------------------------------------------*/
819 spillLRWithPtrReg (symbol * forSym)
825 debugLog ("%s\n", __FUNCTION__);
826 if (!_G.regAssigned ||
827 bitVectIsZero (_G.regAssigned))
830 r0 = pic14_regWithIdx (R0_IDX);
831 r1 = pic14_regWithIdx (R1_IDX);
833 /* for all live ranges */
834 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
835 lrsym = hTabNextItem (liveRanges, &k))
839 /* if no registers assigned to it or
841 /* if it does not overlap with this then
842 not need to spill it */
844 if (lrsym->isspilt || !lrsym->nRegs ||
845 (lrsym->liveTo < forSym->liveFrom))
848 /* go thru the registers : if it is either
849 r0 or r1 then spil it */
850 for (j = 0; j < lrsym->nRegs; j++)
851 if (lrsym->regs[j] == r0 ||
852 lrsym->regs[j] == r1)
861 /*-----------------------------------------------------------------*/
862 /* createStackSpil - create a location on the stack to spil */
863 /*-----------------------------------------------------------------*/
865 createStackSpil (symbol * sym)
868 int useXstack, model, noOverlay;
871 debugLog ("%s\n", __FUNCTION__);
873 /* first go try and find a free one that is already
874 existing on the stack */
875 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
877 /* found a free one : just update & return */
878 sym->usl.spillLoc = sloc;
881 addSetHead (&sloc->usl.itmpStack, sym);
885 /* could not then have to create one , this is the hard part
886 we need to allocate this on the stack : this is really a
887 hack!! but cannot think of anything better at this time */
889 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
891 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
896 sloc = newiTemp (slocBuffer);
898 /* set the type to the spilling symbol */
899 sloc->type = copyLinkChain (sym->type);
900 sloc->etype = getSpec (sloc->type);
901 SPEC_SCLS (sloc->etype) = S_DATA;
902 SPEC_EXTR (sloc->etype) = 0;
904 /* we don't allow it to be allocated`
905 onto the external stack since : so we
906 temporarily turn it off ; we also
907 turn off memory model to prevent
908 the spil from going to the external storage
909 and turn off overlaying
912 useXstack = options.useXstack;
913 model = options.model;
914 noOverlay = options.noOverlay;
915 options.noOverlay = 1;
916 options.model = options.useXstack = 0;
920 options.useXstack = useXstack;
921 options.model = model;
922 options.noOverlay = noOverlay;
923 sloc->isref = 1; /* to prevent compiler warning */
925 /* if it is on the stack then update the stack */
926 if (IN_STACK (sloc->etype))
928 currFunc->stack += getSize (sloc->type);
929 _G.stackExtend += getSize (sloc->type);
932 _G.dataExtend += getSize (sloc->type);
934 /* add it to the _G.stackSpil set */
935 addSetHead (&_G.stackSpil, sloc);
936 sym->usl.spillLoc = sloc;
939 /* add it to the set of itempStack set
940 of the spill location */
941 addSetHead (&sloc->usl.itmpStack, sym);
945 /*-----------------------------------------------------------------*/
946 /* isSpiltOnStack - returns true if the spil location is on stack */
947 /*-----------------------------------------------------------------*/
949 isSpiltOnStack (symbol * sym)
953 debugLog ("%s\n", __FUNCTION__);
960 /* if (sym->_G.stackSpil) */
963 if (!sym->usl.spillLoc)
966 etype = getSpec (sym->usl.spillLoc->type);
967 if (IN_STACK (etype))
973 /*-----------------------------------------------------------------*/
974 /* spillThis - spils a specific operand */
975 /*-----------------------------------------------------------------*/
977 spillThis (symbol * sym)
980 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
982 /* if this is rematerializable or has a spillLocation
983 we are okay, else we need to create a spillLocation
985 if (!(sym->remat || sym->usl.spillLoc))
986 createStackSpil (sym);
989 /* mark it has spilt & put it in the spilt set */
991 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
993 bitVectUnSetBit (_G.regAssigned, sym->key);
995 for (i = 0; i < sym->nRegs; i++)
999 freeReg (sym->regs[i]);
1000 sym->regs[i] = NULL;
1003 /* if spilt on stack then free up r0 & r1
1004 if they could have been assigned to some
1006 if (!pic14_ptrRegReq && isSpiltOnStack (sym))
1009 spillLRWithPtrReg (sym);
1012 if (sym->usl.spillLoc && !sym->remat)
1013 sym->usl.spillLoc->allocreq = 1;
1017 /*-----------------------------------------------------------------*/
1018 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1019 /*-----------------------------------------------------------------*/
1021 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1023 bitVect *lrcs = NULL;
1027 debugLog ("%s\n", __FUNCTION__);
1028 /* get the spillable live ranges */
1029 lrcs = computeSpillable (ic);
1031 /* get all live ranges that are rematerizable */
1032 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1035 /* return the least used of these */
1036 return leastUsedLR (selectS);
1039 /* get live ranges with spillLocations in direct space */
1040 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1042 sym = leastUsedLR (selectS);
1043 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1044 sym->usl.spillLoc->rname :
1045 sym->usl.spillLoc->name));
1047 /* mark it as allocation required */
1048 sym->usl.spillLoc->allocreq = 1;
1052 /* if the symbol is local to the block then */
1053 if (forSym->liveTo < ebp->lSeq)
1056 /* check if there are any live ranges allocated
1057 to registers that are not used in this block */
1058 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1060 sym = leastUsedLR (selectS);
1061 /* if this is not rematerializable */
1070 /* check if there are any live ranges that not
1071 used in the remainder of the block */
1072 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1074 sym = leastUsedLR (selectS);
1077 sym->remainSpil = 1;
1084 /* find live ranges with spillocation && not used as pointers */
1085 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1088 sym = leastUsedLR (selectS);
1089 /* mark this as allocation required */
1090 sym->usl.spillLoc->allocreq = 1;
1094 /* find live ranges with spillocation */
1095 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1098 sym = leastUsedLR (selectS);
1099 sym->usl.spillLoc->allocreq = 1;
1103 /* couldn't find then we need to create a spil
1104 location on the stack , for which one? the least
1106 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1109 /* return a created spil location */
1110 sym = createStackSpil (leastUsedLR (selectS));
1111 sym->usl.spillLoc->allocreq = 1;
1115 /* this is an extreme situation we will spill
1116 this one : happens very rarely but it does happen */
1122 /*-----------------------------------------------------------------*/
1123 /* spilSomething - spil some variable & mark registers as free */
1124 /*-----------------------------------------------------------------*/
1126 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1131 debugLog ("%s\n", __FUNCTION__);
1132 /* get something we can spil */
1133 ssym = selectSpil (ic, ebp, forSym);
1135 /* mark it as spilt */
1137 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1139 /* mark it as not register assigned &
1140 take it away from the set */
1141 bitVectUnSetBit (_G.regAssigned, ssym->key);
1143 /* mark the registers as free */
1144 for (i = 0; i < ssym->nRegs; i++)
1146 freeReg (ssym->regs[i]);
1148 /* if spilt on stack then free up r0 & r1
1149 if they could have been assigned to as gprs */
1150 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1153 spillLRWithPtrReg (ssym);
1156 /* if this was a block level spil then insert push & pop
1157 at the start & end of block respectively */
1158 if (ssym->blockSpil)
1160 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1161 /* add push to the start of the block */
1162 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1163 ebp->sch->next : ebp->sch));
1164 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1165 /* add pop to the end of the block */
1166 addiCodeToeBBlock (ebp, nic, NULL);
1169 /* if spilt because not used in the remainder of the
1170 block then add a push before this instruction and
1171 a pop at the end of the block */
1172 if (ssym->remainSpil)
1175 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1176 /* add push just before this instruction */
1177 addiCodeToeBBlock (ebp, nic, ic);
1179 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1180 /* add pop to the end of the block */
1181 addiCodeToeBBlock (ebp, nic, NULL);
1190 /*-----------------------------------------------------------------*/
1191 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1192 /*-----------------------------------------------------------------*/
1194 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1198 debugLog ("%s\n", __FUNCTION__);
1200 /* try for a ptr type */
1201 if ((reg = allocReg (REG_PTR)))
1204 /* try for gpr type */
1205 if ((reg = allocReg (REG_GPR)))
1208 /* we have to spil */
1209 if (!spilSomething (ic, ebp, sym))
1212 /* this looks like an infinite loop but
1213 in really selectSpil will abort */
1217 /*-----------------------------------------------------------------*/
1218 /* getRegGpr - will try for GPR if not spil */
1219 /*-----------------------------------------------------------------*/
1221 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1225 debugLog ("%s\n", __FUNCTION__);
1227 /* try for gpr type */
1228 if ((reg = allocReg (REG_GPR)))
1231 if (!pic14_ptrRegReq)
1232 if ((reg = allocReg (REG_PTR)))
1235 /* we have to spil */
1236 if (!spilSomething (ic, ebp, sym))
1239 /* this looks like an infinite loop but
1240 in really selectSpil will abort */
1244 /*-----------------------------------------------------------------*/
1245 /* symHasReg - symbol has a given register */
1246 /*-----------------------------------------------------------------*/
1248 symHasReg (symbol * sym, regs * reg)
1252 debugLog ("%s\n", __FUNCTION__);
1253 for (i = 0; i < sym->nRegs; i++)
1254 if (sym->regs[i] == reg)
1260 /*-----------------------------------------------------------------*/
1261 /* deassignLRs - check the live to and if they have registers & are */
1262 /* not spilt then free up the registers */
1263 /*-----------------------------------------------------------------*/
1265 deassignLRs (iCode * ic, eBBlock * ebp)
1271 debugLog ("%s\n", __FUNCTION__);
1272 for (sym = hTabFirstItem (liveRanges, &k); sym;
1273 sym = hTabNextItem (liveRanges, &k))
1276 symbol *psym = NULL;
1277 /* if it does not end here */
1278 if (sym->liveTo > ic->seq)
1281 /* if it was spilt on stack then we can
1282 mark the stack spil location as free */
1287 sym->usl.spillLoc->isFree = 1;
1293 if (!bitVectBitValue (_G.regAssigned, sym->key))
1296 /* special case check if this is an IFX &
1297 the privious one was a pop and the
1298 previous one was not spilt then keep track
1300 if (ic->op == IFX && ic->prev &&
1301 ic->prev->op == IPOP &&
1302 !ic->prev->parmPush &&
1303 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
1304 psym = OP_SYMBOL (IC_LEFT (ic->prev));
1310 bitVectUnSetBit (_G.regAssigned, sym->key);
1312 /* if the result of this one needs registers
1313 and does not have it then assign it right
1315 if (IC_RESULT (ic) &&
1316 !(SKIP_IC2 (ic) || /* not a special icode */
1317 ic->op == JUMPTABLE ||
1322 POINTER_SET (ic)) &&
1323 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
1324 result->liveTo > ic->seq && /* and will live beyond this */
1325 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
1326 result->regType == sym->regType && /* same register types */
1327 result->nRegs && /* which needs registers */
1328 !result->isspilt && /* and does not already have them */
1330 !bitVectBitValue (_G.regAssigned, result->key) &&
1331 /* the number of free regs + number of regs in this LR
1332 can accomodate the what result Needs */
1333 ((nfreeRegsType (result->regType) +
1334 sym->nRegs) >= result->nRegs)
1338 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
1340 result->regs[i] = sym->regs[i];
1342 result->regs[i] = getRegGpr (ic, ebp, result);
1344 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
1348 /* free the remaining */
1349 for (; i < sym->nRegs; i++)
1353 if (!symHasReg (psym, sym->regs[i]))
1354 freeReg (sym->regs[i]);
1357 freeReg (sym->regs[i]);
1364 /*-----------------------------------------------------------------*/
1365 /* reassignLR - reassign this to registers */
1366 /*-----------------------------------------------------------------*/
1368 reassignLR (operand * op)
1370 symbol *sym = OP_SYMBOL (op);
1373 debugLog ("%s\n", __FUNCTION__);
1374 /* not spilt any more */
1375 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
1376 bitVectUnSetBit (_G.spiltSet, sym->key);
1378 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1382 for (i = 0; i < sym->nRegs; i++)
1383 sym->regs[i]->isFree = 0;
1386 /*-----------------------------------------------------------------*/
1387 /* willCauseSpill - determines if allocating will cause a spill */
1388 /*-----------------------------------------------------------------*/
1390 willCauseSpill (int nr, int rt)
1392 debugLog ("%s\n", __FUNCTION__);
1393 /* first check if there are any avlb registers
1394 of te type required */
1397 /* special case for pointer type
1398 if pointer type not avlb then
1399 check for type gpr */
1400 if (nFreeRegs (rt) >= nr)
1402 if (nFreeRegs (REG_GPR) >= nr)
1407 if (pic14_ptrRegReq)
1409 if (nFreeRegs (rt) >= nr)
1414 if (nFreeRegs (REG_PTR) +
1415 nFreeRegs (REG_GPR) >= nr)
1420 debugLog (" ... yep it will (cause a spill)\n");
1421 /* it will cause a spil */
1425 /*-----------------------------------------------------------------*/
1426 /* positionRegs - the allocator can allocate same registers to res- */
1427 /* ult and operand, if this happens make sure they are in the same */
1428 /* position as the operand otherwise chaos results */
1429 /*-----------------------------------------------------------------*/
1431 positionRegs (symbol * result, symbol * opsym, int lineno)
1433 int count = min (result->nRegs, opsym->nRegs);
1434 int i, j = 0, shared = 0;
1436 debugLog ("%s\n", __FUNCTION__);
1437 /* if the result has been spilt then cannot share */
1442 /* first make sure that they actually share */
1443 for (i = 0; i < count; i++)
1445 for (j = 0; j < count; j++)
1447 if (result->regs[i] == opsym->regs[j] && i != j)
1457 regs *tmp = result->regs[i];
1458 result->regs[i] = result->regs[j];
1459 result->regs[j] = tmp;
1464 /*-----------------------------------------------------------------*/
1465 /* serialRegAssign - serially allocate registers to the variables */
1466 /*-----------------------------------------------------------------*/
1468 serialRegAssign (eBBlock ** ebbs, int count)
1472 debugLog ("%s\n", __FUNCTION__);
1473 /* for all blocks */
1474 for (i = 0; i < count; i++)
1479 if (ebbs[i]->noPath &&
1480 (ebbs[i]->entryLabel != entryLabel &&
1481 ebbs[i]->entryLabel != returnLabel))
1484 /* of all instructions do */
1485 for (ic = ebbs[i]->sch; ic; ic = ic->next)
1488 debugLog (" op: %s\n", decodeOp (ic->op));
1490 /* if this is an ipop that means some live
1491 range will have to be assigned again */
1493 reassignLR (IC_LEFT (ic));
1495 /* if result is present && is a true symbol */
1496 if (IC_RESULT (ic) && ic->op != IFX &&
1497 IS_TRUE_SYMOP (IC_RESULT (ic)))
1498 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
1500 /* take away registers from live
1501 ranges that end at this instruction */
1502 deassignLRs (ic, ebbs[i]);
1504 /* some don't need registers */
1505 if (SKIP_IC2 (ic) ||
1506 ic->op == JUMPTABLE ||
1510 (IC_RESULT (ic) && POINTER_SET (ic)))
1513 /* now we need to allocate registers
1514 only for the result */
1517 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
1523 /* if it does not need or is spilt
1524 or is already assigned to registers
1525 or will not live beyond this instructions */
1528 bitVectBitValue (_G.regAssigned, sym->key) ||
1529 sym->liveTo <= ic->seq)
1532 /* if some liverange has been spilt at the block level
1533 and this one live beyond this block then spil this
1535 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
1540 /* if trying to allocate this will cause
1541 a spill and there is nothing to spill
1542 or this one is rematerializable then
1544 willCS = willCauseSpill (sym->nRegs, sym->regType);
1545 spillable = computeSpillable (ic);
1547 (willCS && bitVectIsZero (spillable)))
1555 /* if it has a spillocation & is used less than
1556 all other live ranges then spill this */
1557 if (willCS && sym->usl.spillLoc)
1561 leastUsedLR (liveRangesWith (spillable,
1566 leastUsed->used > sym->used)
1573 if (ic->op == RECEIVE)
1574 debugLog ("When I get clever, I'll optimize the receive logic\n");
1576 /* if we need ptr regs for the right side
1578 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
1579 <= (unsigned) PTRSIZE)
1584 /* else we assign registers to it */
1585 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1587 debugLog (" %d - \n", __LINE__);
1589 for (j = 0; j < sym->nRegs; j++)
1591 if (sym->regType == REG_PTR)
1592 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
1594 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
1596 /* if the allocation falied which means
1597 this was spilt then break */
1601 debugLog (" %d - \n", __LINE__);
1603 /* if it shares registers with operands make sure
1604 that they are in the same position */
1605 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
1606 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
1607 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
1608 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
1609 /* do the same for the right operand */
1610 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
1611 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
1612 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
1613 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
1615 debugLog (" %d - \n", __LINE__);
1618 debugLog (" %d - \n", __LINE__);
1628 /*-----------------------------------------------------------------*/
1629 /* rUmaskForOp :- returns register mask for an operand */
1630 /*-----------------------------------------------------------------*/
1632 rUmaskForOp (operand * op)
1638 debugLog ("%s\n", __FUNCTION__);
1639 /* only temporaries are assigned registers */
1643 sym = OP_SYMBOL (op);
1645 /* if spilt or no registers assigned to it
1647 if (sym->isspilt || !sym->nRegs)
1650 rumask = newBitVect (pic14_nRegs);
1652 for (j = 0; j < sym->nRegs; j++)
1654 rumask = bitVectSetBit (rumask,
1655 sym->regs[j]->rIdx);
1661 /*-----------------------------------------------------------------*/
1662 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
1663 /*-----------------------------------------------------------------*/
1665 regsUsedIniCode (iCode * ic)
1667 bitVect *rmask = newBitVect (pic14_nRegs);
1669 debugLog ("%s\n", __FUNCTION__);
1670 /* do the special cases first */
1673 rmask = bitVectUnion (rmask,
1674 rUmaskForOp (IC_COND (ic)));
1678 /* for the jumptable */
1679 if (ic->op == JUMPTABLE)
1681 rmask = bitVectUnion (rmask,
1682 rUmaskForOp (IC_JTCOND (ic)));
1687 /* of all other cases */
1689 rmask = bitVectUnion (rmask,
1690 rUmaskForOp (IC_LEFT (ic)));
1694 rmask = bitVectUnion (rmask,
1695 rUmaskForOp (IC_RIGHT (ic)));
1698 rmask = bitVectUnion (rmask,
1699 rUmaskForOp (IC_RESULT (ic)));
1705 /*-----------------------------------------------------------------*/
1706 /* createRegMask - for each instruction will determine the regsUsed */
1707 /*-----------------------------------------------------------------*/
1709 createRegMask (eBBlock ** ebbs, int count)
1713 debugLog ("%s\n", __FUNCTION__);
1714 /* for all blocks */
1715 for (i = 0; i < count; i++)
1719 if (ebbs[i]->noPath &&
1720 (ebbs[i]->entryLabel != entryLabel &&
1721 ebbs[i]->entryLabel != returnLabel))
1724 /* for all instructions */
1725 for (ic = ebbs[i]->sch; ic; ic = ic->next)
1730 if (SKIP_IC2 (ic) || !ic->rlive)
1733 /* first mark the registers used in this
1735 ic->rUsed = regsUsedIniCode (ic);
1736 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
1738 /* now create the register mask for those
1739 registers that are in use : this is a
1740 super set of ic->rUsed */
1741 ic->rMask = newBitVect (pic14_nRegs + 1);
1743 /* for all live Ranges alive at this point */
1744 for (j = 1; j < ic->rlive->size; j++)
1749 /* if not alive then continue */
1750 if (!bitVectBitValue (ic->rlive, j))
1753 /* find the live range we are interested in */
1754 if (!(sym = hTabItemWithKey (liveRanges, j)))
1756 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1757 "createRegMask cannot find live range");
1761 /* if no register assigned to it */
1762 if (!sym->nRegs || sym->isspilt)
1765 /* for all the registers allocated to it */
1766 for (k = 0; k < sym->nRegs; k++)
1769 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
1775 /*-----------------------------------------------------------------*/
1776 /* rematStr - returns the rematerialized string for a remat var */
1777 /*-----------------------------------------------------------------*/
1779 rematStr (symbol * sym)
1782 iCode *ic = sym->rematiCode;
1784 debugLog ("%s\n", __FUNCTION__);
1789 /* if plus or minus print the right hand side */
1791 if (ic->op == '+' || ic->op == '-') {
1792 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
1795 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
1799 if (ic->op == '+' || ic->op == '-')
1801 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
1802 sprintf (s, "(%s %c 0x%04x)",
1803 OP_SYMBOL (IC_LEFT (ric))->rname,
1805 (int) operandLitValue (IC_RIGHT (ic)));
1808 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
1813 /* we reached the end */
1814 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
1818 printf ("%s\n", buffer);
1822 /*-----------------------------------------------------------------*/
1823 /* regTypeNum - computes the type & number of registers required */
1824 /*-----------------------------------------------------------------*/
1832 debugLog ("%s\n", __FUNCTION__);
1833 /* for each live range do */
1834 for (sym = hTabFirstItem (liveRanges, &k); sym;
1835 sym = hTabNextItem (liveRanges, &k))
1838 debugLog (" %d - %s\n", __LINE__, sym->rname);
1840 /* if used zero times then no registers needed */
1841 if ((sym->liveTo - sym->liveFrom) == 0)
1845 /* if the live range is a temporary */
1849 debugLog (" %d - \n", __LINE__);
1851 /* if the type is marked as a conditional */
1852 if (sym->regType == REG_CND)
1855 /* if used in return only then we don't
1857 if (sym->ruonly || sym->accuse)
1859 if (IS_AGGREGATE (sym->type) || sym->isptr)
1860 sym->type = aggrToPtr (sym->type, FALSE);
1861 debugLog (" %d - \n", __LINE__);
1866 /* if the symbol has only one definition &
1867 that definition is a get_pointer and the
1868 pointer we are getting is rematerializable and
1871 if (bitVectnBitsOn (sym->defs) == 1 &&
1872 (ic = hTabItemWithKey (iCodehTab,
1873 bitVectFirstBit (sym->defs))) &&
1875 !IS_BITVAR (sym->etype))
1878 debugLog (" %d - \n", __LINE__);
1880 /* if remat in data space */
1881 if (OP_SYMBOL (IC_LEFT (ic))->remat &&
1882 DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER)
1885 /* create a psuedo symbol & force a spil */
1886 symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
1887 psym->type = sym->type;
1888 psym->etype = sym->etype;
1889 strcpy (psym->rname, psym->name);
1891 sym->usl.spillLoc = psym;
1895 /* if in data space or idata space then try to
1896 allocate pointer register */
1900 /* if not then we require registers */
1901 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
1902 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
1903 getSize (sym->type));
1907 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
1908 printTypeChain (sym->type, stderr);
1909 fprintf (stderr, "\n");
1912 debugLog (" %d - \n", __LINE__);
1914 /* determine the type of register required */
1915 if (sym->nRegs == 1 &&
1916 IS_PTR (sym->type) &&
1918 sym->regType = REG_PTR;
1920 sym->regType = REG_GPR;
1921 debugLog (" reg type %s\n", debugLogRegType (sym->regType));
1925 /* for the first run we don't provide */
1926 /* registers for true symbols we will */
1927 /* see how things go */
1933 /*-----------------------------------------------------------------*/
1934 /* freeAllRegs - mark all registers as free */
1935 /*-----------------------------------------------------------------*/
1937 pic14_freeAllRegs ()
1941 debugLog ("%s\n", __FUNCTION__);
1942 for (i = 0; i < pic14_nRegs; i++)
1943 regspic14[i].isFree = 1;
1946 /*-----------------------------------------------------------------*/
1947 /*-----------------------------------------------------------------*/
1949 pic14_deallocateAllRegs ()
1953 debugLog ("%s\n", __FUNCTION__);
1954 for (i = 0; i < pic14_nRegs; i++) {
1955 regspic14[i].isFree = 1;
1956 regspic14[i].wasUsed = 0;
1961 /*-----------------------------------------------------------------*/
1962 /* deallocStackSpil - this will set the stack pointer back */
1963 /*-----------------------------------------------------------------*/
1965 DEFSETFUNC (deallocStackSpil)
1969 debugLog ("%s\n", __FUNCTION__);
1974 /*-----------------------------------------------------------------*/
1975 /* farSpacePackable - returns the packable icode for far variables */
1976 /*-----------------------------------------------------------------*/
1978 farSpacePackable (iCode * ic)
1982 debugLog ("%s\n", __FUNCTION__);
1983 /* go thru till we find a definition for the
1984 symbol on the right */
1985 for (dic = ic->prev; dic; dic = dic->prev)
1988 /* if the definition is a call then no */
1989 if ((dic->op == CALL || dic->op == PCALL) &&
1990 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
1995 /* if shift by unknown amount then not */
1996 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
1997 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2000 /* if pointer get and size > 1 */
2001 if (POINTER_GET (dic) &&
2002 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2005 if (POINTER_SET (dic) &&
2006 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2009 /* if any three is a true symbol in far space */
2010 if (IC_RESULT (dic) &&
2011 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2012 isOperandInFarSpace (IC_RESULT (dic)))
2015 if (IC_RIGHT (dic) &&
2016 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2017 isOperandInFarSpace (IC_RIGHT (dic)) &&
2018 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2021 if (IC_LEFT (dic) &&
2022 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2023 isOperandInFarSpace (IC_LEFT (dic)) &&
2024 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2027 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2029 if ((dic->op == LEFT_OP ||
2030 dic->op == RIGHT_OP ||
2032 IS_OP_LITERAL (IC_RIGHT (dic)))
2042 /*-----------------------------------------------------------------*/
2043 /* packRegsForAssign - register reduction for assignment */
2044 /*-----------------------------------------------------------------*/
2046 packRegsForAssign (iCode * ic, eBBlock * ebp)
2051 debugLog ("%s\n", __FUNCTION__);
2053 debugAopGet (" result:", IC_RESULT (ic));
2054 debugAopGet (" left:", IC_LEFT (ic));
2055 debugAopGet (" right:", IC_RIGHT (ic));
2057 if (!IS_ITEMP (IC_RIGHT (ic)) ||
2058 OP_SYMBOL (IC_RIGHT (ic))->isind ||
2059 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2064 /* if the true symbol is defined in far space or on stack
2065 then we should not since this will increase register pressure */
2066 if (isOperandInFarSpace (IC_RESULT (ic)))
2068 if ((dic = farSpacePackable (ic)))
2074 /* find the definition of iTempNN scanning backwards if we find a
2075 a use of the true symbol before we find the definition then
2077 for (dic = ic->prev; dic; dic = dic->prev)
2080 /* if there is a function call and this is
2081 a parameter & not my parameter then don't pack it */
2082 if ((dic->op == CALL || dic->op == PCALL) &&
2083 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2084 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2086 debugLog (" %d - \n", __LINE__);
2094 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2095 IS_OP_VOLATILE (IC_RESULT (dic)))
2097 debugLog (" %d - \n", __LINE__);
2102 if (IS_SYMOP (IC_RESULT (dic)) &&
2103 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2105 debugLog (" %d - dic key == ic key -- pointer set=%c\n", __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
2106 if (POINTER_SET (dic))
2112 if (IS_SYMOP (IC_RIGHT (dic)) &&
2113 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
2114 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2116 debugLog (" %d - \n", __LINE__);
2121 if (IS_SYMOP (IC_LEFT (dic)) &&
2122 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2123 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2125 debugLog (" %d - \n", __LINE__);
2130 if (POINTER_SET (dic) &&
2131 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
2133 debugLog (" %d - \n", __LINE__);
2140 return 0; /* did not find */
2142 /* if the result is on stack or iaccess then it must be
2143 the same atleast one of the operands */
2144 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
2145 OP_SYMBOL (IC_RESULT (ic))->iaccess)
2148 /* the operation has only one symbol
2149 operator then we can pack */
2150 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
2151 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
2154 if (!((IC_LEFT (dic) &&
2155 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
2157 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
2161 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
2162 /* found the definition */
2163 /* replace the result with the result of */
2164 /* this assignment and remove this assignment */
2165 IC_RESULT (dic) = IC_RESULT (ic);
2167 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
2169 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
2171 /* delete from liverange table also
2172 delete from all the points inbetween and the new
2174 for (sic = dic; sic != ic; sic = sic->next)
2176 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
2177 if (IS_ITEMP (IC_RESULT (dic)))
2178 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
2181 remiCodeFromeBBlock (ebp, ic);
2182 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2183 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2189 /*-----------------------------------------------------------------*/
2190 /* findAssignToSym : scanning backwards looks for first assig found */
2191 /*-----------------------------------------------------------------*/
2193 findAssignToSym (operand * op, iCode * ic)
2197 debugLog ("%s\n", __FUNCTION__);
2198 for (dic = ic->prev; dic; dic = dic->prev)
2201 /* if definition by assignment */
2202 if (dic->op == '=' &&
2203 !POINTER_SET (dic) &&
2204 IC_RESULT (dic)->key == op->key
2205 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
2209 /* we are interested only if defined in far space */
2210 /* or in stack space in case of + & - */
2212 /* if assigned to a non-symbol then return
2214 if (!IS_SYMOP (IC_RIGHT (dic)))
2217 /* if the symbol is in far space then
2219 if (isOperandInFarSpace (IC_RIGHT (dic)))
2222 /* for + & - operations make sure that
2223 if it is on the stack it is the same
2224 as one of the three operands */
2225 if ((ic->op == '+' || ic->op == '-') &&
2226 OP_SYMBOL (IC_RIGHT (dic))->onStack)
2229 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
2230 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
2231 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
2239 /* if we find an usage then we cannot delete it */
2240 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
2243 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
2246 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
2250 /* now make sure that the right side of dic
2251 is not defined between ic & dic */
2254 iCode *sic = dic->next;
2256 for (; sic != ic; sic = sic->next)
2257 if (IC_RESULT (sic) &&
2258 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
2267 /*-----------------------------------------------------------------*/
2268 /* packRegsForSupport :- reduce some registers for support calls */
2269 /*-----------------------------------------------------------------*/
2271 packRegsForSupport (iCode * ic, eBBlock * ebp)
2275 debugLog ("%s\n", __FUNCTION__);
2276 /* for the left & right operand :- look to see if the
2277 left was assigned a true symbol in far space in that
2278 case replace them */
2279 if (IS_ITEMP (IC_LEFT (ic)) &&
2280 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
2282 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
2288 debugAopGet ("removing left:", IC_LEFT (ic));
2290 /* found it we need to remove it from the
2292 for (sic = dic; sic != ic; sic = sic->next)
2293 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
2295 IC_LEFT (ic)->operand.symOperand =
2296 IC_RIGHT (dic)->operand.symOperand;
2297 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
2298 remiCodeFromeBBlock (ebp, dic);
2299 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2303 /* do the same for the right operand */
2306 IS_ITEMP (IC_RIGHT (ic)) &&
2307 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
2309 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
2315 /* if this is a subtraction & the result
2316 is a true symbol in far space then don't pack */
2317 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
2319 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
2320 if (IN_FARSPACE (SPEC_OCLS (etype)))
2324 debugAopGet ("removing right:", IC_RIGHT (ic));
2326 /* found it we need to remove it from the
2328 for (sic = dic; sic != ic; sic = sic->next)
2329 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
2331 IC_RIGHT (ic)->operand.symOperand =
2332 IC_RIGHT (dic)->operand.symOperand;
2333 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
2335 remiCodeFromeBBlock (ebp, dic);
2336 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2343 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
2346 /*-----------------------------------------------------------------*/
2347 /* packRegsForOneuse : - will reduce some registers for single Use */
2348 /*-----------------------------------------------------------------*/
2350 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
2355 debugLog ("%s\n", __FUNCTION__);
2356 /* if returning a literal then do nothing */
2360 /* only upto 2 bytes since we cannot predict
2361 the usage of b, & acc */
2362 if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
2367 /* this routine will mark the a symbol as used in one
2368 instruction use only && if the definition is local
2369 (ie. within the basic block) && has only one definition &&
2370 that definition is either a return value from a
2371 function or does not contain any variables in
2373 uses = bitVectCopy (OP_USES (op));
2374 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
2375 if (!bitVectIsZero (uses)) /* has other uses */
2378 /* if it has only one defintion */
2379 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
2380 return NULL; /* has more than one definition */
2382 /* get that definition */
2384 hTabItemWithKey (iCodehTab,
2385 bitVectFirstBit (OP_DEFS (op)))))
2388 /* found the definition now check if it is local */
2389 if (dic->seq < ebp->fSeq ||
2390 dic->seq > ebp->lSeq)
2391 return NULL; /* non-local */
2393 /* now check if it is the return from
2395 if (dic->op == CALL || dic->op == PCALL)
2397 if (ic->op != SEND && ic->op != RETURN)
2399 OP_SYMBOL (op)->ruonly = 1;
2406 /* otherwise check that the definition does
2407 not contain any symbols in far space */
2408 if (isOperandInFarSpace (IC_LEFT (dic)) ||
2409 isOperandInFarSpace (IC_RIGHT (dic)) ||
2410 IS_OP_RUONLY (IC_LEFT (ic)) ||
2411 IS_OP_RUONLY (IC_RIGHT (ic)))
2416 /* if pointer set then make sure the pointer
2418 if (POINTER_SET (dic) &&
2419 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
2422 if (POINTER_GET (dic) &&
2423 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
2428 /* also make sure the intervenening instructions
2429 don't have any thing in far space */
2430 for (dic = dic->next; dic && dic != ic; dic = dic->next)
2433 /* if there is an intervening function call then no */
2434 if (dic->op == CALL || dic->op == PCALL)
2436 /* if pointer set then make sure the pointer
2438 if (POINTER_SET (dic) &&
2439 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
2442 if (POINTER_GET (dic) &&
2443 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
2446 /* if address of & the result is remat then okay */
2447 if (dic->op == ADDRESS_OF &&
2448 OP_SYMBOL (IC_RESULT (dic))->remat)
2451 /* if operand has size of three or more & this
2452 operation is a '*','/' or '%' then 'b' may
2454 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
2455 getSize (operandType (op)) >= 3)
2458 /* if left or right or result is in far space */
2459 if (isOperandInFarSpace (IC_LEFT (dic)) ||
2460 isOperandInFarSpace (IC_RIGHT (dic)) ||
2461 isOperandInFarSpace (IC_RESULT (dic)) ||
2462 IS_OP_RUONLY (IC_LEFT (dic)) ||
2463 IS_OP_RUONLY (IC_RIGHT (dic)) ||
2464 IS_OP_RUONLY (IC_RESULT (dic)))
2470 OP_SYMBOL (op)->ruonly = 1;
2475 /*-----------------------------------------------------------------*/
2476 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
2477 /*-----------------------------------------------------------------*/
2479 isBitwiseOptimizable (iCode * ic)
2481 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
2482 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
2484 debugLog ("%s\n", __FUNCTION__);
2485 /* bitwise operations are considered optimizable
2486 under the following conditions (Jean-Louis VERN)
2498 if (IS_LITERAL (rtype) ||
2499 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
2505 /*-----------------------------------------------------------------*/
2506 /* packRegsForAccUse - pack registers for acc use */
2507 /*-----------------------------------------------------------------*/
2509 packRegsForAccUse (iCode * ic)
2513 debugLog ("%s\n", __FUNCTION__);
2514 /* if + or - then it has to be one byte result */
2515 if ((ic->op == '+' || ic->op == '-')
2516 && getSize (operandType (IC_RESULT (ic))) > 1)
2519 /* if shift operation make sure right side is not a literal */
2520 if (ic->op == RIGHT_OP &&
2521 (isOperandLiteral (IC_RIGHT (ic)) ||
2522 getSize (operandType (IC_RESULT (ic))) > 1))
2525 if (ic->op == LEFT_OP &&
2526 (isOperandLiteral (IC_RIGHT (ic)) ||
2527 getSize (operandType (IC_RESULT (ic))) > 1))
2530 if (IS_BITWISE_OP (ic) &&
2531 getSize (operandType (IC_RESULT (ic))) > 1)
2535 /* has only one definition */
2536 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
2539 /* has only one use */
2540 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
2543 /* and the usage immediately follows this iCode */
2544 if (!(uic = hTabItemWithKey (iCodehTab,
2545 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
2548 if (ic->next != uic)
2551 /* if it is a conditional branch then we definitely can */
2555 if (uic->op == JUMPTABLE)
2558 /* if the usage is not is an assignment
2559 or an arithmetic / bitwise / shift operation then not */
2560 if (POINTER_SET (uic) &&
2561 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
2564 if (uic->op != '=' &&
2565 !IS_ARITHMETIC_OP (uic) &&
2566 !IS_BITWISE_OP (uic) &&
2567 uic->op != LEFT_OP &&
2568 uic->op != RIGHT_OP)
2571 /* if used in ^ operation then make sure right is not a
2573 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
2576 /* if shift operation make sure right side is not a literal */
2577 if (uic->op == RIGHT_OP &&
2578 (isOperandLiteral (IC_RIGHT (uic)) ||
2579 getSize (operandType (IC_RESULT (uic))) > 1))
2582 if (uic->op == LEFT_OP &&
2583 (isOperandLiteral (IC_RIGHT (uic)) ||
2584 getSize (operandType (IC_RESULT (uic))) > 1))
2587 /* make sure that the result of this icode is not on the
2588 stack, since acc is used to compute stack offset */
2589 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
2590 OP_SYMBOL (IC_RESULT (uic))->onStack)
2593 /* if either one of them in far space then we cannot */
2594 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
2595 isOperandInFarSpace (IC_LEFT (uic))) ||
2596 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
2597 isOperandInFarSpace (IC_RIGHT (uic))))
2600 /* if the usage has only one operand then we can */
2601 if (IC_LEFT (uic) == NULL ||
2602 IC_RIGHT (uic) == NULL)
2605 /* make sure this is on the left side if not
2606 a '+' since '+' is commutative */
2607 if (ic->op != '+' &&
2608 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
2611 /* if one of them is a literal then we can */
2612 if ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
2613 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic))))
2615 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
2619 /* if the other one is not on stack then we can */
2620 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
2621 (IS_ITEMP (IC_RIGHT (uic)) ||
2622 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
2623 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
2626 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
2627 (IS_ITEMP (IC_LEFT (uic)) ||
2628 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
2629 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
2635 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
2640 /*-----------------------------------------------------------------*/
2641 /* packForPush - hueristics to reduce iCode for pushing */
2642 /*-----------------------------------------------------------------*/
2644 packForReceive (iCode * ic, eBBlock * ebp)
2647 bool can_remove = 1; // assume that we can remove temporary
2649 debugLog ("%s\n", __FUNCTION__);
2650 debugAopGet (" result:", IC_RESULT (ic));
2651 debugAopGet (" left:", IC_LEFT (ic));
2652 debugAopGet (" right:", IC_RIGHT (ic));
2657 for (dic = ic->next; dic; dic = dic->next)
2662 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
2663 debugLog (" used on left\n");
2664 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
2665 debugLog (" used on right\n");
2666 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
2667 debugLog (" used on result\n");
2669 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
2670 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
2675 debugLog (" hey we can remove this unnecessary assign\n");
2677 /*-----------------------------------------------------------------*/
2678 /* packForPush - hueristics to reduce iCode for pushing */
2679 /*-----------------------------------------------------------------*/
2681 packForPush (iCode * ic, eBBlock * ebp)
2685 debugLog ("%s\n", __FUNCTION__);
2686 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
2689 /* must have only definition & one usage */
2690 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
2691 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
2694 /* find the definition */
2695 if (!(dic = hTabItemWithKey (iCodehTab,
2696 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
2699 if (dic->op != '=' || POINTER_SET (dic))
2702 /* we now we know that it has one & only one def & use
2703 and the that the definition is an assignment */
2704 IC_LEFT (ic) = IC_RIGHT (dic);
2706 remiCodeFromeBBlock (ebp, dic);
2707 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2710 /*-----------------------------------------------------------------*/
2711 /* packRegisters - does some transformations to reduce register */
2713 /*-----------------------------------------------------------------*/
2715 packRegisters (eBBlock * ebp)
2720 debugLog ("%s\n", __FUNCTION__);
2727 /* look for assignments of the form */
2728 /* iTempNN = TRueSym (someoperation) SomeOperand */
2730 /* TrueSym := iTempNN:1 */
2731 for (ic = ebp->sch; ic; ic = ic->next)
2734 /* find assignment of the form TrueSym := iTempNN:1 */
2735 if (ic->op == '=' && !POINTER_SET (ic))
2736 change += packRegsForAssign (ic, ebp);
2740 if (POINTER_SET (ic))
2741 debugLog ("pointer is set\n");
2742 debugAopGet (" result:", IC_RESULT (ic));
2743 debugAopGet (" left:", IC_LEFT (ic));
2744 debugAopGet (" right:", IC_RIGHT (ic));
2753 for (ic = ebp->sch; ic; ic = ic->next)
2756 /* if this is an itemp & result of a address of a true sym
2757 then mark this as rematerialisable */
2758 if (ic->op == ADDRESS_OF &&
2759 IS_ITEMP (IC_RESULT (ic)) &&
2760 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
2761 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
2762 !OP_SYMBOL (IC_LEFT (ic))->onStack)
2765 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2766 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2767 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2771 /* if straight assignment then carry remat flag if
2772 this is the only definition */
2773 if (ic->op == '=' &&
2774 !POINTER_SET (ic) &&
2775 IS_SYMOP (IC_RIGHT (ic)) &&
2776 OP_SYMBOL (IC_RIGHT (ic))->remat &&
2777 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
2780 OP_SYMBOL (IC_RESULT (ic))->remat =
2781 OP_SYMBOL (IC_RIGHT (ic))->remat;
2782 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
2783 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
2786 /* if this is a +/- operation with a rematerizable
2787 then mark this as rematerializable as well */
2788 if ((ic->op == '+' || ic->op == '-') &&
2789 (IS_SYMOP (IC_LEFT (ic)) &&
2790 IS_ITEMP (IC_RESULT (ic)) &&
2791 OP_SYMBOL (IC_LEFT (ic))->remat &&
2792 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
2793 IS_OP_LITERAL (IC_RIGHT (ic))))
2797 operandLitValue (IC_RIGHT (ic));
2798 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2799 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2800 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2803 /* mark the pointer usages */
2804 if (POINTER_SET (ic))
2806 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
2807 debugLog (" marking as a pointer (set)\n");
2809 if (POINTER_GET (ic))
2811 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
2812 debugLog (" marking as a pointer (get)\n");
2817 /* if we are using a symbol on the stack
2818 then we should say pic14_ptrRegReq */
2819 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
2820 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
2821 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
2822 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
2823 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
2824 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
2827 if (IS_SYMOP (IC_LEFT (ic)))
2828 pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
2829 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
2830 if (IS_SYMOP (IC_RIGHT (ic)))
2831 pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
2832 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
2833 if (IS_SYMOP (IC_RESULT (ic)))
2834 pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
2835 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
2839 /* if the condition of an if instruction
2840 is defined in the previous instruction then
2841 mark the itemp as a conditional */
2842 if ((IS_CONDITIONAL (ic) ||
2843 ((ic->op == BITWISEAND ||
2846 isBitwiseOptimizable (ic))) &&
2847 ic->next && ic->next->op == IFX &&
2848 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
2849 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
2852 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
2856 /* reduce for support function calls */
2857 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
2858 packRegsForSupport (ic, ebp);
2860 /* if a parameter is passed, it's in W, so we may not
2861 need to place a copy in a register */
2862 if (ic->op == RECEIVE)
2863 packForReceive (ic, ebp);
2865 /* some cases the redundant moves can
2866 can be eliminated for return statements */
2867 if ((ic->op == RETURN || ic->op == SEND) &&
2868 !isOperandInFarSpace (IC_LEFT (ic)) &&
2870 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
2872 /* if pointer set & left has a size more than
2873 one and right is not in far space */
2874 if (POINTER_SET (ic) &&
2875 !isOperandInFarSpace (IC_RIGHT (ic)) &&
2876 !OP_SYMBOL (IC_RESULT (ic))->remat &&
2877 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
2878 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
2880 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
2882 /* if pointer get */
2883 if (POINTER_GET (ic) &&
2884 !isOperandInFarSpace (IC_RESULT (ic)) &&
2885 !OP_SYMBOL (IC_LEFT (ic))->remat &&
2886 !IS_OP_RUONLY (IC_RESULT (ic)) &&
2887 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
2889 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
2892 /* if this is cast for intergral promotion then
2893 check if only use of the definition of the
2894 operand being casted/ if yes then replace
2895 the result of that arithmetic operation with
2896 this result and get rid of the cast */
2899 sym_link *fromType = operandType (IC_RIGHT (ic));
2900 sym_link *toType = operandType (IC_LEFT (ic));
2902 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
2903 getSize (fromType) != getSize (toType))
2906 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
2909 if (IS_ARITHMETIC_OP (dic))
2911 IC_RESULT (dic) = IC_RESULT (ic);
2912 remiCodeFromeBBlock (ebp, ic);
2913 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2914 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2918 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
2924 /* if the type from and type to are the same
2925 then if this is the only use then packit */
2926 if (checkType (operandType (IC_RIGHT (ic)),
2927 operandType (IC_LEFT (ic))) == 1)
2929 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
2932 IC_RESULT (dic) = IC_RESULT (ic);
2933 remiCodeFromeBBlock (ebp, ic);
2934 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2935 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2943 iTempNN := (some variable in farspace) V1
2948 if (ic->op == IPUSH)
2950 packForPush (ic, ebp);
2954 /* pack registers for accumulator use, when the
2955 result of an arithmetic or bit wise operation
2956 has only one use, that use is immediately following
2957 the defintion and the using iCode has only one
2958 operand or has two operands but one is literal &
2959 the result of that operation is not on stack then
2960 we can leave the result of this operation in acc:b
2962 if ((IS_ARITHMETIC_OP (ic)
2964 || IS_BITWISE_OP (ic)
2966 || ic->op == LEFT_OP || ic->op == RIGHT_OP
2969 IS_ITEMP (IC_RESULT (ic)) &&
2970 getSize (operandType (IC_RESULT (ic))) <= 2)
2972 packRegsForAccUse (ic);
2978 dumpEbbsToDebug (eBBlock ** ebbs, int count)
2982 if (!debug || !debugF)
2985 for (i = 0; i < count; i++)
2987 fprintf (debugF, "\n----------------------------------------------------------------\n");
2988 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
2989 ebbs[i]->entryLabel->name,
2992 ebbs[i]->isLastInLoop);
2993 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
2998 fprintf (debugF, "visited %d : hasFcall = %d\n",
3002 fprintf (debugF, "\ndefines bitVector :");
3003 bitVectDebugOn (ebbs[i]->defSet, debugF);
3004 fprintf (debugF, "\nlocal defines bitVector :");
3005 bitVectDebugOn (ebbs[i]->ldefs, debugF);
3006 fprintf (debugF, "\npointers Set bitvector :");
3007 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
3008 fprintf (debugF, "\nin pointers Set bitvector :");
3009 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
3010 fprintf (debugF, "\ninDefs Set bitvector :");
3011 bitVectDebugOn (ebbs[i]->inDefs, debugF);
3012 fprintf (debugF, "\noutDefs Set bitvector :");
3013 bitVectDebugOn (ebbs[i]->outDefs, debugF);
3014 fprintf (debugF, "\nusesDefs Set bitvector :");
3015 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
3016 fprintf (debugF, "\n----------------------------------------------------------------\n");
3017 printiCChain (ebbs[i]->sch, debugF);
3020 /*-----------------------------------------------------------------*/
3021 /* assignRegisters - assigns registers to each live range as need */
3022 /*-----------------------------------------------------------------*/
3024 pic14_assignRegisters (eBBlock ** ebbs, int count)
3029 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
3030 debugLog ("ebbs before optimizing:\n");
3031 dumpEbbsToDebug (ebbs, count);
3033 setToNull ((void *) &_G.funcrUsed);
3034 pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
3037 /* change assignments this will remove some
3038 live ranges reducing some register pressure */
3039 for (i = 0; i < count; i++)
3040 packRegisters (ebbs[i]);
3042 if (options.dump_pack)
3043 dumpEbbsToFileExt (".dumppack", ebbs, count);
3045 /* first determine for each live range the number of
3046 registers & the type of registers required for each */
3049 /* and serially allocate registers */
3050 serialRegAssign (ebbs, count);
3052 /* if stack was extended then tell the user */
3055 /* werror(W_TOOMANY_SPILS,"stack", */
3056 /* _G.stackExtend,currFunc->name,""); */
3062 /* werror(W_TOOMANY_SPILS,"data space", */
3063 /* _G.dataExtend,currFunc->name,""); */
3067 /* after that create the register mask
3068 for each of the instruction */
3069 createRegMask (ebbs, count);
3071 /* redo that offsets for stacked automatic variables */
3072 redoStackOffsets ();
3074 if (options.dump_rassgn)
3075 dumpEbbsToFileExt (".dumprassgn", ebbs, count);
3077 /* now get back the chain */
3078 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
3080 debugLog ("ebbs after optimizing:\n");
3081 dumpEbbsToDebug (ebbs, count);
3086 /* free up any _G.stackSpil locations allocated */
3087 applyToSet (_G.stackSpil, deallocStackSpil);
3089 setToNull ((void **) &_G.stackSpil);
3090 setToNull ((void **) &_G.spiltSet);
3091 /* mark all registers as free */
3092 pic14_freeAllRegs ();
3094 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");