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 */
61 /* A nasty, awful, disgusting hack for register declarations */
67 {REG_GPR, PO_GPR_TEMP, 0x0C, "r0x0C", "r0x0C", 0x0C, 1, 0},
68 {REG_GPR, PO_GPR_TEMP, 0x0D, "r0x0D", "r0x0C", 0x0D, 1, 0},
69 {REG_GPR, PO_GPR_TEMP, 0x0E, "r0x0E", "r0x0C", 0x0E, 1, 0},
70 {REG_GPR, PO_GPR_TEMP, 0x0F, "r0x0F", "r0x0C", 0x0F, 1, 0},
71 {REG_GPR, PO_GPR_TEMP, 0x10, "r0x10", "r0x10", 0x10, 1, 0},
72 {REG_GPR, PO_GPR_TEMP, 0x11, "r0x11", "r0x11", 0x11, 1, 0},
73 {REG_GPR, PO_GPR_TEMP, 0x12, "r0x12", "r0x12", 0x12, 1, 0},
74 {REG_GPR, PO_GPR_TEMP, 0x13, "r0x13", "r0x13", 0x13, 1, 0},
75 {REG_GPR, PO_GPR_TEMP, 0x14, "r0x14", "r0x14", 0x14, 1, 0},
76 {REG_GPR, PO_GPR_TEMP, 0x15, "r0x15", "r0x15", 0x15, 1, 0},
77 {REG_GPR, PO_GPR_TEMP, 0x16, "r0x16", "r0x16", 0x16, 1, 0},
78 {REG_GPR, PO_GPR_TEMP, 0x17, "r0x17", "r0x17", 0x17, 1, 0},
79 {REG_GPR, PO_GPR_TEMP, 0x18, "r0x18", "r0x18", 0x18, 1, 0},
80 {REG_GPR, PO_GPR_TEMP, 0x19, "r0x19", "r0x19", 0x19, 1, 0},
81 {REG_GPR, PO_GPR_TEMP, 0x1A, "r0x1A", "r0x1A", 0x1A, 1, 0},
82 {REG_GPR, PO_GPR_TEMP, 0x1B, "r0x1B", "r0x1B", 0x1B, 1, 0},
83 {REG_GPR, PO_GPR_TEMP, 0x1C, "r0x1C", "r0x1C", 0x1C, 1, 0},
84 {REG_GPR, PO_GPR_TEMP, 0x1D, "r0x1D", "r0x1D", 0x1D, 1, 0},
85 {REG_GPR, PO_GPR_TEMP, 0x1E, "r0x1E", "r0x1E", 0x1E, 1, 0},
86 {REG_GPR, PO_GPR_TEMP, 0x1F, "r0x1F", "r0x1F", 0x1F, 1, 0},
87 {REG_PTR, PO_FSR, 4, "FSR", "FSR", 4, 1, 0},
92 int Gstack_base_addr=0x38; /* The starting address of registers that
93 * are used to pass and return parameters */
96 {REG_GPR, PO_GPR_TEMP, 0x20, "r0x20", "r0x20", 0x20, 1, 0},
97 {REG_GPR, PO_GPR_TEMP, 0x21, "r0x21", "r0x21", 0x21, 1, 0},
98 {REG_GPR, PO_GPR_TEMP, 0x22, "r0x22", "r0x22", 0x22, 1, 0},
99 {REG_GPR, PO_GPR_TEMP, 0x23, "r0x23", "r0x23", 0x23, 1, 0},
100 {REG_GPR, PO_GPR_TEMP, 0x24, "r0x24", "r0x24", 0x24, 1, 0},
101 {REG_GPR, PO_GPR_TEMP, 0x25, "r0x25", "r0x25", 0x25, 1, 0},
102 {REG_GPR, PO_GPR_TEMP, 0x26, "r0x26", "r0x26", 0x26, 1, 0},
103 {REG_GPR, PO_GPR_TEMP, 0x27, "r0x27", "r0x27", 0x27, 1, 0},
104 {REG_GPR, PO_GPR_TEMP, 0x28, "r0x28", "r0x28", 0x28, 1, 0},
105 {REG_GPR, PO_GPR_TEMP, 0x29, "r0x29", "r0x29", 0x29, 1, 0},
106 {REG_GPR, PO_GPR_TEMP, 0x2A, "r0x2A", "r0x2A", 0x2A, 1, 0},
107 {REG_GPR, PO_GPR_TEMP, 0x2B, "r0x2B", "r0x2B", 0x2B, 1, 0},
108 {REG_GPR, PO_GPR_TEMP, 0x2C, "r0x2C", "r0x2C", 0x2C, 1, 0},
109 {REG_GPR, PO_GPR_TEMP, 0x2D, "r0x2D", "r0x2D", 0x2D, 1, 0},
110 {REG_GPR, PO_GPR_TEMP, 0x2E, "r0x2E", "r0x2E", 0x2E, 1, 0},
111 {REG_GPR, PO_GPR_TEMP, 0x2F, "r0x2F", "r0x2F", 0x2F, 1, 0},
112 {REG_GPR, PO_GPR_TEMP, 0x30, "r0x30", "r0x30", 0x30, 1, 0},
113 {REG_GPR, PO_GPR_TEMP, 0x31, "r0x31", "r0x31", 0x31, 1, 0},
114 {REG_GPR, PO_GPR_TEMP, 0x32, "r0x32", "r0x32", 0x32, 1, 0},
115 {REG_GPR, PO_GPR_TEMP, 0x33, "r0x33", "r0x33", 0x33, 1, 0},
116 {REG_GPR, PO_GPR_TEMP, 0x34, "r0x34", "r0x34", 0x34, 1, 0},
117 {REG_GPR, PO_GPR_TEMP, 0x35, "r0x35", "r0x35", 0x35, 1, 0},
118 {REG_GPR, PO_GPR_TEMP, 0x36, "r0x36", "r0x36", 0x36, 1, 0},
119 {REG_GPR, PO_GPR_TEMP, 0x37, "r0x37", "r0x37", 0x37, 1, 0},
120 {REG_STK, PO_GPR_TEMP, 0x38, "r0x38", "r0x38", 0x38, 1, 0},
121 {REG_STK, PO_GPR_TEMP, 0x39, "r0x39", "r0x39", 0x39, 1, 0},
122 {REG_STK, PO_GPR_TEMP, 0x3A, "r0x3A", "r0x3A", 0x3A, 1, 0},
123 {REG_STK, PO_GPR_TEMP, 0x3B, "r0x3B", "r0x3B", 0x3B, 1, 0},
124 {REG_STK, PO_GPR_TEMP, 0x3C, "r0x3C", "r0x3C", 0x3C, 1, 0},
125 {REG_STK, PO_GPR_TEMP, 0x3D, "r0x3D", "r0x3D", 0x3D, 1, 0},
126 {REG_STK, PO_GPR_TEMP, 0x3E, "r0x3E", "r0x3E", 0x3E, 1, 0},
127 {REG_STK, PO_GPR_TEMP, 0x3F, "r0x3F", "r0x3F", 0x3F, 1, 0},
128 {REG_STK, PO_GPR_TEMP, 0x40, "r0x40", "r0x40", 0x40, 1, 0},
129 {REG_STK, PO_GPR_TEMP, 0x41, "r0x41", "r0x41", 0x41, 1, 0},
130 {REG_STK, PO_GPR_TEMP, 0x42, "r0x42", "r0x42", 0x42, 1, 0},
131 {REG_STK, PO_GPR_TEMP, 0x43, "r0x43", "r0x43", 0x43, 1, 0},
132 {REG_STK, PO_GPR_TEMP, 0x44, "r0x44", "r0x44", 0x44, 1, 0},
133 {REG_STK, PO_GPR_TEMP, 0x45, "r0x45", "r0x45", 0x45, 1, 0},
134 {REG_STK, PO_GPR_TEMP, 0x46, "r0x46", "r0x46", 0x46, 1, 0},
135 {REG_STK, PO_GPR_TEMP, 0x47, "r0x47", "r0x47", 0x47, 1, 0},
137 {REG_PTR, PO_FSR, 4, "FSR", "FSR", 4, 1, 0},
143 int pic14_nRegs = sizeof (regspic14) / sizeof (regs);
144 static void spillThis (symbol *);
145 static int debug = 1;
146 static FILE *debugF = NULL;
147 /*-----------------------------------------------------------------*/
148 /* debugLog - open a file for debugging information */
149 /*-----------------------------------------------------------------*/
150 //static void debugLog(char *inst,char *fmt, ...)
152 debugLog (char *fmt,...)
154 static int append = 0; // First time through, open the file without append.
157 //char *bufferP=buffer;
160 if (!debug || !srcFileName)
166 /* create the file name */
167 strcpy (buffer, srcFileName);
168 strcat (buffer, ".d");
170 if (!(debugF = fopen (buffer, (append ? "a+" : "w"))))
172 werror (E_FILE_OPEN_ERR, buffer);
175 append = 1; // Next time debubLog is called, we'll append the debug info
181 vsprintf (buffer, fmt, ap);
183 fprintf (debugF, "%s", buffer);
185 while (isspace(*bufferP)) bufferP++;
187 if (bufferP && *bufferP)
188 lineCurr = (lineCurr ?
189 connectLine(lineCurr,newLineNode(lb)) :
190 (lineHead = newLineNode(lb)));
191 lineCurr->isInline = _G.inLine;
192 lineCurr->isDebug = _G.debugLine;
202 fputc ('\n', debugF);
204 /*-----------------------------------------------------------------*/
205 /* debugLogClose - closes the debug log file (if opened) */
206 /*-----------------------------------------------------------------*/
216 #define AOP(op) op->aop
219 debugAopGet (char *str, operand * op)
224 printOperand (op, debugF);
232 decodeOp (unsigned int op)
235 if (op < 128 && op > ' ')
237 buffer[0] = (op & 0xff);
251 return "STRING_LITERAL";
287 return "LEFT_ASSIGN";
289 return "RIGHT_ASSIGN";
404 case GET_VALUE_AT_ADDRESS:
405 return "GET_VALUE_AT_ADDRESS";
423 return "ENDFUNCTION";
447 sprintf (buffer, "unkown op %d %c", op, op & 0xff);
450 /*-----------------------------------------------------------------*/
451 /*-----------------------------------------------------------------*/
453 debugLogRegType (short type)
466 sprintf (buffer, "unkown reg type %d", type);
470 /*-----------------------------------------------------------------*/
471 /* allocReg - allocates register of given type */
472 /*-----------------------------------------------------------------*/
474 allocReg (short type)
478 debugLog ("%s of type %s\n", __FUNCTION__, debugLogRegType (type));
480 for (i = 0; i < pic14_nRegs; i++)
483 /* if type is given as 0 then any
484 free register will do */
488 regspic14[i].isFree = 0;
489 regspic14[i].wasUsed = 1;
492 bitVectSetBit (currFunc->regsUsed, i);
493 debugLog (" returning %s\n", regspic14[i].name);
494 return ®spic14[i];
496 /* other wise look for specific type
498 if (regspic14[i].isFree &&
499 regspic14[i].type == type)
501 regspic14[i].isFree = 0;
502 regspic14[i].wasUsed = 1;
505 bitVectSetBit (currFunc->regsUsed, i);
506 debugLog (" returning %s\n", regspic14[i].name);
507 return ®spic14[i];
513 /*-----------------------------------------------------------------*/
514 /* pic14_regWithIdx - returns pointer to register wit index number */
515 /*-----------------------------------------------------------------*/
517 pic14_regWithIdx (int idx)
521 debugLog ("%s - requesting index = 0x%x\n", __FUNCTION__,idx);
523 for (i = 0; i < pic14_nRegs; i++)
524 if (regspic14[i].rIdx == idx)
525 return ®spic14[i];
527 //return ®spic14[0];
528 fprintf(stderr,"%s %d - requested register: 0x%x\n",__FUNCTION__,__LINE__,idx);
529 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
530 "regWithIdx not found");
534 /*-----------------------------------------------------------------*/
535 /*-----------------------------------------------------------------*/
537 pic14_findFreeReg(short type)
541 for (i = 0; i < pic14_nRegs; i++) {
542 if (!type && regspic14[i].isFree)
543 return ®spic14[i];
544 if (regspic14[i].isFree &&
545 regspic14[i].type == type)
546 return ®spic14[i];
550 /*-----------------------------------------------------------------*/
551 /* freeReg - frees a register */
552 /*-----------------------------------------------------------------*/
556 debugLog ("%s\n", __FUNCTION__);
561 /*-----------------------------------------------------------------*/
562 /* nFreeRegs - returns number of free registers */
563 /*-----------------------------------------------------------------*/
570 debugLog ("%s\n", __FUNCTION__);
571 for (i = 0; i < pic14_nRegs; i++)
572 if (regspic14[i].isFree && regspic14[i].type == type)
577 /*-----------------------------------------------------------------*/
578 /* nfreeRegsType - free registers with type */
579 /*-----------------------------------------------------------------*/
581 nfreeRegsType (int type)
584 debugLog ("%s\n", __FUNCTION__);
587 if ((nfr = nFreeRegs (type)) == 0)
588 return nFreeRegs (REG_GPR);
591 return nFreeRegs (type);
595 /*-----------------------------------------------------------------*/
596 /* allDefsOutOfRange - all definitions are out of a range */
597 /*-----------------------------------------------------------------*/
599 allDefsOutOfRange (bitVect * defs, int fseq, int toseq)
603 debugLog ("%s\n", __FUNCTION__);
607 for (i = 0; i < defs->size; i++)
611 if (bitVectBitValue (defs, i) &&
612 (ic = hTabItemWithKey (iCodehTab, i)) &&
613 (ic->seq >= fseq && ic->seq <= toseq))
622 /*-----------------------------------------------------------------*/
623 /* computeSpillable - given a point find the spillable live ranges */
624 /*-----------------------------------------------------------------*/
626 computeSpillable (iCode * ic)
630 debugLog ("%s\n", __FUNCTION__);
631 /* spillable live ranges are those that are live at this
632 point . the following categories need to be subtracted
634 a) - those that are already spilt
635 b) - if being used by this one
636 c) - defined by this one */
638 spillable = bitVectCopy (ic->rlive);
640 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
642 bitVectCplAnd (spillable, ic->uses); /* used in this one */
643 bitVectUnSetBit (spillable, ic->defKey);
644 spillable = bitVectIntersect (spillable, _G.regAssigned);
649 /*-----------------------------------------------------------------*/
650 /* noSpilLoc - return true if a variable has no spil location */
651 /*-----------------------------------------------------------------*/
653 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
655 debugLog ("%s\n", __FUNCTION__);
656 return (sym->usl.spillLoc ? 0 : 1);
659 /*-----------------------------------------------------------------*/
660 /* hasSpilLoc - will return 1 if the symbol has spil location */
661 /*-----------------------------------------------------------------*/
663 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
665 debugLog ("%s\n", __FUNCTION__);
666 return (sym->usl.spillLoc ? 1 : 0);
669 /*-----------------------------------------------------------------*/
670 /* directSpilLoc - will return 1 if the splilocation is in direct */
671 /*-----------------------------------------------------------------*/
673 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
675 debugLog ("%s\n", __FUNCTION__);
676 if (sym->usl.spillLoc &&
677 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
683 /*-----------------------------------------------------------------*/
684 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
685 /* but is not used as a pointer */
686 /*-----------------------------------------------------------------*/
688 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
690 debugLog ("%s\n", __FUNCTION__);
691 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
694 /*-----------------------------------------------------------------*/
695 /* rematable - will return 1 if the remat flag is set */
696 /*-----------------------------------------------------------------*/
698 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
700 debugLog ("%s\n", __FUNCTION__);
704 /*-----------------------------------------------------------------*/
705 /* notUsedInBlock - not used in this block */
706 /*-----------------------------------------------------------------*/
708 notUsedInBlock (symbol * sym, eBBlock * ebp, iCode * ic)
710 debugLog ("%s\n", __FUNCTION__);
711 return (!bitVectBitsInCommon (sym->defs, ebp->usesDefs) &&
712 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
713 /* return (!bitVectBitsInCommon(sym->defs,ebp->usesDefs)); */
716 /*-----------------------------------------------------------------*/
717 /* notUsedInRemaining - not used or defined in remain of the block */
718 /*-----------------------------------------------------------------*/
720 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
722 debugLog ("%s\n", __FUNCTION__);
723 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
724 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
727 /*-----------------------------------------------------------------*/
728 /* allLRs - return true for all */
729 /*-----------------------------------------------------------------*/
731 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
733 debugLog ("%s\n", __FUNCTION__);
737 /*-----------------------------------------------------------------*/
738 /* liveRangesWith - applies function to a given set of live range */
739 /*-----------------------------------------------------------------*/
741 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
742 eBBlock * ebp, iCode * ic)
747 debugLog ("%s\n", __FUNCTION__);
748 if (!lrs || !lrs->size)
751 for (i = 1; i < lrs->size; i++)
754 if (!bitVectBitValue (lrs, i))
757 /* if we don't find it in the live range
758 hash table we are in serious trouble */
759 if (!(sym = hTabItemWithKey (liveRanges, i)))
761 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
762 "liveRangesWith could not find liveRange");
766 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
767 addSetHead (&rset, sym);
774 /*-----------------------------------------------------------------*/
775 /* leastUsedLR - given a set determines which is the least used */
776 /*-----------------------------------------------------------------*/
778 leastUsedLR (set * sset)
780 symbol *sym = NULL, *lsym = NULL;
782 debugLog ("%s\n", __FUNCTION__);
783 sym = lsym = setFirstItem (sset);
788 for (; lsym; lsym = setNextItem (sset))
791 /* if usage is the same then prefer
792 the spill the smaller of the two */
793 if (lsym->used == sym->used)
794 if (getSize (lsym->type) < getSize (sym->type))
798 if (lsym->used < sym->used)
803 setToNull ((void **) &sset);
808 /*-----------------------------------------------------------------*/
809 /* noOverLap - will iterate through the list looking for over lap */
810 /*-----------------------------------------------------------------*/
812 noOverLap (set * itmpStack, symbol * fsym)
815 debugLog ("%s\n", __FUNCTION__);
818 for (sym = setFirstItem (itmpStack); sym;
819 sym = setNextItem (itmpStack))
821 if (sym->liveTo > fsym->liveFrom)
829 /*-----------------------------------------------------------------*/
830 /* isFree - will return 1 if the a free spil location is found */
831 /*-----------------------------------------------------------------*/
836 V_ARG (symbol **, sloc);
837 V_ARG (symbol *, fsym);
839 debugLog ("%s\n", __FUNCTION__);
840 /* if already found */
844 /* if it is free && and the itmp assigned to
845 this does not have any overlapping live ranges
846 with the one currently being assigned and
847 the size can be accomodated */
849 noOverLap (sym->usl.itmpStack, fsym) &&
850 getSize (sym->type) >= getSize (fsym->type))
859 /*-----------------------------------------------------------------*/
860 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
861 /*-----------------------------------------------------------------*/
863 spillLRWithPtrReg (symbol * forSym)
869 debugLog ("%s\n", __FUNCTION__);
870 if (!_G.regAssigned ||
871 bitVectIsZero (_G.regAssigned))
874 r0 = pic14_regWithIdx (R0_IDX);
875 r1 = pic14_regWithIdx (R1_IDX);
877 /* for all live ranges */
878 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
879 lrsym = hTabNextItem (liveRanges, &k))
883 /* if no registers assigned to it or
885 /* if it does not overlap with this then
886 not need to spill it */
888 if (lrsym->isspilt || !lrsym->nRegs ||
889 (lrsym->liveTo < forSym->liveFrom))
892 /* go thru the registers : if it is either
893 r0 or r1 then spil it */
894 for (j = 0; j < lrsym->nRegs; j++)
895 if (lrsym->regs[j] == r0 ||
896 lrsym->regs[j] == r1)
905 /*-----------------------------------------------------------------*/
906 /* createStackSpil - create a location on the stack to spil */
907 /*-----------------------------------------------------------------*/
909 createStackSpil (symbol * sym)
912 int useXstack, model, noOverlay;
915 debugLog ("%s\n", __FUNCTION__);
917 /* first go try and find a free one that is already
918 existing on the stack */
919 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
921 /* found a free one : just update & return */
922 sym->usl.spillLoc = sloc;
925 addSetHead (&sloc->usl.itmpStack, sym);
929 /* could not then have to create one , this is the hard part
930 we need to allocate this on the stack : this is really a
931 hack!! but cannot think of anything better at this time */
933 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
935 fprintf (stderr, "kkkInternal error: slocBuffer overflowed: %s:%d\n",
940 sloc = newiTemp (slocBuffer);
942 /* set the type to the spilling symbol */
943 sloc->type = copyLinkChain (sym->type);
944 sloc->etype = getSpec (sloc->type);
945 SPEC_SCLS (sloc->etype) = S_DATA;
946 SPEC_EXTR (sloc->etype) = 0;
947 SPEC_STAT (sloc->etype) = 0;
949 /* we don't allow it to be allocated`
950 onto the external stack since : so we
951 temporarily turn it off ; we also
952 turn off memory model to prevent
953 the spil from going to the external storage
954 and turn off overlaying
957 useXstack = options.useXstack;
958 model = options.model;
959 noOverlay = options.noOverlay;
960 options.noOverlay = 1;
961 options.model = options.useXstack = 0;
965 options.useXstack = useXstack;
966 options.model = model;
967 options.noOverlay = noOverlay;
968 sloc->isref = 1; /* to prevent compiler warning */
970 /* if it is on the stack then update the stack */
971 if (IN_STACK (sloc->etype))
973 currFunc->stack += getSize (sloc->type);
974 _G.stackExtend += getSize (sloc->type);
977 _G.dataExtend += getSize (sloc->type);
979 /* add it to the _G.stackSpil set */
980 addSetHead (&_G.stackSpil, sloc);
981 sym->usl.spillLoc = sloc;
984 /* add it to the set of itempStack set
985 of the spill location */
986 addSetHead (&sloc->usl.itmpStack, sym);
990 /*-----------------------------------------------------------------*/
991 /* isSpiltOnStack - returns true if the spil location is on stack */
992 /*-----------------------------------------------------------------*/
994 isSpiltOnStack (symbol * sym)
998 debugLog ("%s\n", __FUNCTION__);
1005 /* if (sym->_G.stackSpil) */
1008 if (!sym->usl.spillLoc)
1011 etype = getSpec (sym->usl.spillLoc->type);
1012 if (IN_STACK (etype))
1018 /*-----------------------------------------------------------------*/
1019 /* spillThis - spils a specific operand */
1020 /*-----------------------------------------------------------------*/
1022 spillThis (symbol * sym)
1025 debugLog ("%s : %s\n", __FUNCTION__, sym->rname);
1027 /* if this is rematerializable or has a spillLocation
1028 we are okay, else we need to create a spillLocation
1030 if (!(sym->remat || sym->usl.spillLoc))
1031 createStackSpil (sym);
1034 /* mark it has spilt & put it in the spilt set */
1036 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
1038 bitVectUnSetBit (_G.regAssigned, sym->key);
1040 for (i = 0; i < sym->nRegs; i++)
1044 freeReg (sym->regs[i]);
1045 sym->regs[i] = NULL;
1048 /* if spilt on stack then free up r0 & r1
1049 if they could have been assigned to some
1051 if (!pic14_ptrRegReq && isSpiltOnStack (sym))
1054 spillLRWithPtrReg (sym);
1057 if (sym->usl.spillLoc && !sym->remat)
1058 sym->usl.spillLoc->allocreq = 1;
1062 /*-----------------------------------------------------------------*/
1063 /* selectSpil - select a iTemp to spil : rather a simple procedure */
1064 /*-----------------------------------------------------------------*/
1066 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
1068 bitVect *lrcs = NULL;
1072 debugLog ("%s\n", __FUNCTION__);
1073 /* get the spillable live ranges */
1074 lrcs = computeSpillable (ic);
1076 /* get all live ranges that are rematerizable */
1077 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
1080 /* return the least used of these */
1081 return leastUsedLR (selectS);
1084 /* get live ranges with spillLocations in direct space */
1085 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
1087 sym = leastUsedLR (selectS);
1088 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
1089 sym->usl.spillLoc->rname :
1090 sym->usl.spillLoc->name));
1092 /* mark it as allocation required */
1093 sym->usl.spillLoc->allocreq = 1;
1097 /* if the symbol is local to the block then */
1098 if (forSym->liveTo < ebp->lSeq)
1101 /* check if there are any live ranges allocated
1102 to registers that are not used in this block */
1103 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
1105 sym = leastUsedLR (selectS);
1106 /* if this is not rematerializable */
1115 /* check if there are any live ranges that not
1116 used in the remainder of the block */
1117 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
1119 sym = leastUsedLR (selectS);
1122 sym->remainSpil = 1;
1129 /* find live ranges with spillocation && not used as pointers */
1130 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
1133 sym = leastUsedLR (selectS);
1134 /* mark this as allocation required */
1135 sym->usl.spillLoc->allocreq = 1;
1139 /* find live ranges with spillocation */
1140 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
1143 sym = leastUsedLR (selectS);
1144 sym->usl.spillLoc->allocreq = 1;
1148 /* couldn't find then we need to create a spil
1149 location on the stack , for which one? the least
1151 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
1154 /* return a created spil location */
1155 sym = createStackSpil (leastUsedLR (selectS));
1156 sym->usl.spillLoc->allocreq = 1;
1160 /* this is an extreme situation we will spill
1161 this one : happens very rarely but it does happen */
1167 /*-----------------------------------------------------------------*/
1168 /* spilSomething - spil some variable & mark registers as free */
1169 /*-----------------------------------------------------------------*/
1171 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
1176 debugLog ("%s\n", __FUNCTION__);
1177 /* get something we can spil */
1178 ssym = selectSpil (ic, ebp, forSym);
1180 /* mark it as spilt */
1182 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
1184 /* mark it as not register assigned &
1185 take it away from the set */
1186 bitVectUnSetBit (_G.regAssigned, ssym->key);
1188 /* mark the registers as free */
1189 for (i = 0; i < ssym->nRegs; i++)
1191 freeReg (ssym->regs[i]);
1193 /* if spilt on stack then free up r0 & r1
1194 if they could have been assigned to as gprs */
1195 if (!pic14_ptrRegReq && isSpiltOnStack (ssym))
1198 spillLRWithPtrReg (ssym);
1201 /* if this was a block level spil then insert push & pop
1202 at the start & end of block respectively */
1203 if (ssym->blockSpil)
1205 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1206 /* add push to the start of the block */
1207 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
1208 ebp->sch->next : ebp->sch));
1209 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1210 /* add pop to the end of the block */
1211 addiCodeToeBBlock (ebp, nic, NULL);
1214 /* if spilt because not used in the remainder of the
1215 block then add a push before this instruction and
1216 a pop at the end of the block */
1217 if (ssym->remainSpil)
1220 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
1221 /* add push just before this instruction */
1222 addiCodeToeBBlock (ebp, nic, ic);
1224 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
1225 /* add pop to the end of the block */
1226 addiCodeToeBBlock (ebp, nic, NULL);
1235 /*-----------------------------------------------------------------*/
1236 /* getRegPtr - will try for PTR if not a GPR type if not spil */
1237 /*-----------------------------------------------------------------*/
1239 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
1243 debugLog ("%s\n", __FUNCTION__);
1245 /* try for a ptr type */
1246 if ((reg = allocReg (REG_PTR)))
1249 /* try for gpr type */
1250 if ((reg = allocReg (REG_GPR)))
1253 /* we have to spil */
1254 if (!spilSomething (ic, ebp, sym))
1257 /* this looks like an infinite loop but
1258 in really selectSpil will abort */
1262 /*-----------------------------------------------------------------*/
1263 /* getRegGpr - will try for GPR if not spil */
1264 /*-----------------------------------------------------------------*/
1266 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
1270 debugLog ("%s\n", __FUNCTION__);
1272 /* try for gpr type */
1273 if ((reg = allocReg (REG_GPR)))
1276 if (!pic14_ptrRegReq)
1277 if ((reg = allocReg (REG_PTR)))
1280 /* we have to spil */
1281 if (!spilSomething (ic, ebp, sym))
1284 /* this looks like an infinite loop but
1285 in really selectSpil will abort */
1289 /*-----------------------------------------------------------------*/
1290 /* symHasReg - symbol has a given register */
1291 /*-----------------------------------------------------------------*/
1293 symHasReg (symbol * sym, regs * reg)
1297 debugLog ("%s\n", __FUNCTION__);
1298 for (i = 0; i < sym->nRegs; i++)
1299 if (sym->regs[i] == reg)
1305 /*-----------------------------------------------------------------*/
1306 /* deassignLRs - check the live to and if they have registers & are */
1307 /* not spilt then free up the registers */
1308 /*-----------------------------------------------------------------*/
1310 deassignLRs (iCode * ic, eBBlock * ebp)
1316 debugLog ("%s\n", __FUNCTION__);
1317 for (sym = hTabFirstItem (liveRanges, &k); sym;
1318 sym = hTabNextItem (liveRanges, &k))
1321 symbol *psym = NULL;
1322 /* if it does not end here */
1323 if (sym->liveTo > ic->seq)
1326 /* if it was spilt on stack then we can
1327 mark the stack spil location as free */
1332 sym->usl.spillLoc->isFree = 1;
1338 if (!bitVectBitValue (_G.regAssigned, sym->key))
1341 /* special case check if this is an IFX &
1342 the privious one was a pop and the
1343 previous one was not spilt then keep track
1345 if (ic->op == IFX && ic->prev &&
1346 ic->prev->op == IPOP &&
1347 !ic->prev->parmPush &&
1348 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
1349 psym = OP_SYMBOL (IC_LEFT (ic->prev));
1355 bitVectUnSetBit (_G.regAssigned, sym->key);
1357 /* if the result of this one needs registers
1358 and does not have it then assign it right
1360 if (IC_RESULT (ic) &&
1361 !(SKIP_IC2 (ic) || /* not a special icode */
1362 ic->op == JUMPTABLE ||
1367 POINTER_SET (ic)) &&
1368 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
1369 result->liveTo > ic->seq && /* and will live beyond this */
1370 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
1371 result->regType == sym->regType && /* same register types */
1372 result->nRegs && /* which needs registers */
1373 !result->isspilt && /* and does not already have them */
1375 !bitVectBitValue (_G.regAssigned, result->key) &&
1376 /* the number of free regs + number of regs in this LR
1377 can accomodate the what result Needs */
1378 ((nfreeRegsType (result->regType) +
1379 sym->nRegs) >= result->nRegs)
1383 for (i = 0; i < max (sym->nRegs, result->nRegs); i++)
1385 result->regs[i] = sym->regs[i];
1387 result->regs[i] = getRegGpr (ic, ebp, result);
1389 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
1393 /* free the remaining */
1394 for (; i < sym->nRegs; i++)
1398 if (!symHasReg (psym, sym->regs[i]))
1399 freeReg (sym->regs[i]);
1402 freeReg (sym->regs[i]);
1409 /*-----------------------------------------------------------------*/
1410 /* reassignLR - reassign this to registers */
1411 /*-----------------------------------------------------------------*/
1413 reassignLR (operand * op)
1415 symbol *sym = OP_SYMBOL (op);
1418 debugLog ("%s\n", __FUNCTION__);
1419 /* not spilt any more */
1420 sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
1421 bitVectUnSetBit (_G.spiltSet, sym->key);
1423 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1427 for (i = 0; i < sym->nRegs; i++)
1428 sym->regs[i]->isFree = 0;
1431 /*-----------------------------------------------------------------*/
1432 /* willCauseSpill - determines if allocating will cause a spill */
1433 /*-----------------------------------------------------------------*/
1435 willCauseSpill (int nr, int rt)
1437 debugLog ("%s\n", __FUNCTION__);
1438 /* first check if there are any avlb registers
1439 of te type required */
1442 /* special case for pointer type
1443 if pointer type not avlb then
1444 check for type gpr */
1445 if (nFreeRegs (rt) >= nr)
1447 if (nFreeRegs (REG_GPR) >= nr)
1452 if (pic14_ptrRegReq)
1454 if (nFreeRegs (rt) >= nr)
1459 if (nFreeRegs (REG_PTR) +
1460 nFreeRegs (REG_GPR) >= nr)
1465 debugLog (" ... yep it will (cause a spill)\n");
1466 /* it will cause a spil */
1470 /*-----------------------------------------------------------------*/
1471 /* positionRegs - the allocator can allocate same registers to res- */
1472 /* ult and operand, if this happens make sure they are in the same */
1473 /* position as the operand otherwise chaos results */
1474 /*-----------------------------------------------------------------*/
1476 positionRegs (symbol * result, symbol * opsym, int lineno)
1478 int count = min (result->nRegs, opsym->nRegs);
1479 int i, j = 0, shared = 0;
1481 debugLog ("%s\n", __FUNCTION__);
1482 /* if the result has been spilt then cannot share */
1487 /* first make sure that they actually share */
1488 for (i = 0; i < count; i++)
1490 for (j = 0; j < count; j++)
1492 if (result->regs[i] == opsym->regs[j] && i != j)
1502 regs *tmp = result->regs[i];
1503 result->regs[i] = result->regs[j];
1504 result->regs[j] = tmp;
1509 /*-----------------------------------------------------------------*/
1510 /* serialRegAssign - serially allocate registers to the variables */
1511 /*-----------------------------------------------------------------*/
1513 serialRegAssign (eBBlock ** ebbs, int count)
1517 debugLog ("%s\n", __FUNCTION__);
1518 /* for all blocks */
1519 for (i = 0; i < count; i++)
1524 if (ebbs[i]->noPath &&
1525 (ebbs[i]->entryLabel != entryLabel &&
1526 ebbs[i]->entryLabel != returnLabel))
1529 /* of all instructions do */
1530 for (ic = ebbs[i]->sch; ic; ic = ic->next)
1533 debugLog (" op: %s\n", decodeOp (ic->op));
1535 /* if this is an ipop that means some live
1536 range will have to be assigned again */
1538 reassignLR (IC_LEFT (ic));
1540 /* if result is present && is a true symbol */
1541 if (IC_RESULT (ic) && ic->op != IFX &&
1542 IS_TRUE_SYMOP (IC_RESULT (ic)))
1543 OP_SYMBOL (IC_RESULT (ic))->allocreq = 1;
1545 /* take away registers from live
1546 ranges that end at this instruction */
1547 deassignLRs (ic, ebbs[i]);
1549 /* some don't need registers */
1550 if (SKIP_IC2 (ic) ||
1551 ic->op == JUMPTABLE ||
1555 (IC_RESULT (ic) && POINTER_SET (ic)))
1558 /* now we need to allocate registers
1559 only for the result */
1562 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
1568 /* if it does not need or is spilt
1569 or is already assigned to registers
1570 or will not live beyond this instructions */
1573 bitVectBitValue (_G.regAssigned, sym->key) ||
1574 sym->liveTo <= ic->seq)
1577 /* if some liverange has been spilt at the block level
1578 and this one live beyond this block then spil this
1580 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq)
1585 /* if trying to allocate this will cause
1586 a spill and there is nothing to spill
1587 or this one is rematerializable then
1589 willCS = willCauseSpill (sym->nRegs, sym->regType);
1590 spillable = computeSpillable (ic);
1592 (willCS && bitVectIsZero (spillable)))
1600 /* if it has a spillocation & is used less than
1601 all other live ranges then spill this */
1603 if (sym->usl.spillLoc) {
1604 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
1605 allLRs, ebbs[i], ic));
1606 if (leastUsed && leastUsed->used > sym->used) {
1611 /* if none of the liveRanges have a spillLocation then better
1612 to spill this one than anything else already assigned to registers */
1613 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
1620 if (ic->op == RECEIVE)
1621 debugLog ("When I get clever, I'll optimize the receive logic\n");
1623 /* if we need ptr regs for the right side
1625 if (POINTER_GET (ic) && getSize (OP_SYMBOL (IC_LEFT (ic))->type)
1626 <= (unsigned) PTRSIZE)
1631 /* else we assign registers to it */
1632 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1634 debugLog (" %d - \n", __LINE__);
1636 bitVectDebugOn(_G.regAssigned, debugF);
1638 for (j = 0; j < sym->nRegs; j++)
1640 if (sym->regType == REG_PTR)
1641 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
1643 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
1645 /* if the allocation falied which means
1646 this was spilt then break */
1650 debugLog (" %d - \n", __LINE__);
1652 /* if it shares registers with operands make sure
1653 that they are in the same position */
1654 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
1655 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=')
1656 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
1657 OP_SYMBOL (IC_LEFT (ic)), ic->lineno);
1658 /* do the same for the right operand */
1659 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
1660 OP_SYMBOL (IC_RIGHT (ic))->nRegs && ic->op != '=')
1661 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
1662 OP_SYMBOL (IC_RIGHT (ic)), ic->lineno);
1664 debugLog (" %d - \n", __LINE__);
1667 debugLog (" %d - \n", __LINE__);
1677 /*-----------------------------------------------------------------*/
1678 /* rUmaskForOp :- returns register mask for an operand */
1679 /*-----------------------------------------------------------------*/
1681 rUmaskForOp (operand * op)
1687 debugLog ("%s\n", __FUNCTION__);
1688 /* only temporaries are assigned registers */
1692 sym = OP_SYMBOL (op);
1694 /* if spilt or no registers assigned to it
1696 if (sym->isspilt || !sym->nRegs)
1699 rumask = newBitVect (pic14_nRegs);
1701 for (j = 0; j < sym->nRegs; j++)
1703 rumask = bitVectSetBit (rumask,
1704 sym->regs[j]->rIdx);
1710 /*-----------------------------------------------------------------*/
1711 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
1712 /*-----------------------------------------------------------------*/
1714 regsUsedIniCode (iCode * ic)
1716 bitVect *rmask = newBitVect (pic14_nRegs);
1718 debugLog ("%s\n", __FUNCTION__);
1719 /* do the special cases first */
1722 rmask = bitVectUnion (rmask,
1723 rUmaskForOp (IC_COND (ic)));
1727 /* for the jumptable */
1728 if (ic->op == JUMPTABLE)
1730 rmask = bitVectUnion (rmask,
1731 rUmaskForOp (IC_JTCOND (ic)));
1736 /* of all other cases */
1738 rmask = bitVectUnion (rmask,
1739 rUmaskForOp (IC_LEFT (ic)));
1743 rmask = bitVectUnion (rmask,
1744 rUmaskForOp (IC_RIGHT (ic)));
1747 rmask = bitVectUnion (rmask,
1748 rUmaskForOp (IC_RESULT (ic)));
1754 /*-----------------------------------------------------------------*/
1755 /* createRegMask - for each instruction will determine the regsUsed */
1756 /*-----------------------------------------------------------------*/
1758 createRegMask (eBBlock ** ebbs, int count)
1762 debugLog ("%s\n", __FUNCTION__);
1763 /* for all blocks */
1764 for (i = 0; i < count; i++)
1768 if (ebbs[i]->noPath &&
1769 (ebbs[i]->entryLabel != entryLabel &&
1770 ebbs[i]->entryLabel != returnLabel))
1773 /* for all instructions */
1774 for (ic = ebbs[i]->sch; ic; ic = ic->next)
1779 if (SKIP_IC2 (ic) || !ic->rlive)
1782 /* first mark the registers used in this
1784 ic->rUsed = regsUsedIniCode (ic);
1785 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
1787 /* now create the register mask for those
1788 registers that are in use : this is a
1789 super set of ic->rUsed */
1790 ic->rMask = newBitVect (pic14_nRegs + 1);
1792 /* for all live Ranges alive at this point */
1793 for (j = 1; j < ic->rlive->size; j++)
1798 /* if not alive then continue */
1799 if (!bitVectBitValue (ic->rlive, j))
1802 /* find the live range we are interested in */
1803 if (!(sym = hTabItemWithKey (liveRanges, j)))
1805 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1806 "createRegMask cannot find live range");
1810 /* if no register assigned to it */
1811 if (!sym->nRegs || sym->isspilt)
1814 /* for all the registers allocated to it */
1815 for (k = 0; k < sym->nRegs; k++)
1818 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
1824 /*-----------------------------------------------------------------*/
1825 /* rematStr - returns the rematerialized string for a remat var */
1826 /*-----------------------------------------------------------------*/
1828 rematStr (symbol * sym)
1831 iCode *ic = sym->rematiCode;
1833 debugLog ("%s\n", __FUNCTION__);
1838 /* if plus or minus print the right hand side */
1840 if (ic->op == '+' || ic->op == '-') {
1841 sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
1844 ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
1848 if (ic->op == '+' || ic->op == '-')
1850 iCode *ric = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
1851 sprintf (s, "(%s %c 0x%04x)",
1852 OP_SYMBOL (IC_LEFT (ric))->rname,
1854 (int) operandLitValue (IC_RIGHT (ic)));
1857 //ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
1862 /* we reached the end */
1863 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
1867 printf ("%s\n", buffer);
1871 /*-----------------------------------------------------------------*/
1872 /* regTypeNum - computes the type & number of registers required */
1873 /*-----------------------------------------------------------------*/
1881 debugLog ("%s\n", __FUNCTION__);
1882 /* for each live range do */
1883 for (sym = hTabFirstItem (liveRanges, &k); sym;
1884 sym = hTabNextItem (liveRanges, &k)) {
1886 debugLog (" %d - %s\n", __LINE__, sym->rname);
1888 /* if used zero times then no registers needed */
1889 if ((sym->liveTo - sym->liveFrom) == 0)
1893 /* if the live range is a temporary */
1896 debugLog (" %d - itemp register\n", __LINE__);
1898 /* if the type is marked as a conditional */
1899 if (sym->regType == REG_CND)
1902 /* if used in return only then we don't
1904 if (sym->ruonly || sym->accuse) {
1905 if (IS_AGGREGATE (sym->type) || sym->isptr)
1906 sym->type = aggrToPtr (sym->type, FALSE);
1907 debugLog (" %d - no reg needed - used as a return\n", __LINE__);
1912 /* if the symbol has only one definition &
1913 that definition is a get_pointer and the
1914 pointer we are getting is rematerializable and
1917 if (bitVectnBitsOn (sym->defs) == 1 &&
1918 (ic = hTabItemWithKey (iCodehTab,
1919 bitVectFirstBit (sym->defs))) &&
1922 !IS_BITVAR (sym->etype)) {
1925 debugLog (" %d - \n", __LINE__);
1927 /* if remat in data space */
1928 if (OP_SYMBOL (IC_LEFT (ic))->remat &&
1929 DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER) {
1931 /* create a psuedo symbol & force a spil */
1932 symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
1933 psym->type = sym->type;
1934 psym->etype = sym->etype;
1935 strcpy (psym->rname, psym->name);
1937 sym->usl.spillLoc = psym;
1941 /* if in data space or idata space then try to
1942 allocate pointer register */
1946 /* if not then we require registers */
1947 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
1948 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
1949 getSize (sym->type));
1951 if (sym->nRegs > 4) {
1952 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
1953 printTypeChain (sym->type, stderr);
1954 fprintf (stderr, "\n");
1957 /* determine the type of register required */
1958 if (sym->nRegs == 1 &&
1959 IS_PTR (sym->type) &&
1961 sym->regType = REG_PTR;
1963 sym->regType = REG_GPR;
1966 debugLog (" reg name %s, reg type %s\n", sym->rname, debugLogRegType (sym->regType));
1970 /* for the first run we don't provide */
1971 /* registers for true symbols we will */
1972 /* see how things go */
1978 /*-----------------------------------------------------------------*/
1979 /* freeAllRegs - mark all registers as free */
1980 /*-----------------------------------------------------------------*/
1982 pic14_freeAllRegs ()
1986 debugLog ("%s\n", __FUNCTION__);
1987 for (i = 0; i < pic14_nRegs; i++)
1988 regspic14[i].isFree = 1;
1991 /*-----------------------------------------------------------------*/
1992 /*-----------------------------------------------------------------*/
1994 pic14_deallocateAllRegs ()
1998 debugLog ("%s\n", __FUNCTION__);
1999 for (i = 0; i < pic14_nRegs; i++) {
2000 regspic14[i].isFree = 1;
2001 regspic14[i].wasUsed = 0;
2006 /*-----------------------------------------------------------------*/
2007 /* deallocStackSpil - this will set the stack pointer back */
2008 /*-----------------------------------------------------------------*/
2010 DEFSETFUNC (deallocStackSpil)
2014 debugLog ("%s\n", __FUNCTION__);
2019 /*-----------------------------------------------------------------*/
2020 /* farSpacePackable - returns the packable icode for far variables */
2021 /*-----------------------------------------------------------------*/
2023 farSpacePackable (iCode * ic)
2027 debugLog ("%s\n", __FUNCTION__);
2028 /* go thru till we find a definition for the
2029 symbol on the right */
2030 for (dic = ic->prev; dic; dic = dic->prev)
2033 /* if the definition is a call then no */
2034 if ((dic->op == CALL || dic->op == PCALL) &&
2035 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2040 /* if shift by unknown amount then not */
2041 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
2042 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2045 /* if pointer get and size > 1 */
2046 if (POINTER_GET (dic) &&
2047 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
2050 if (POINTER_SET (dic) &&
2051 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
2054 /* if any three is a true symbol in far space */
2055 if (IC_RESULT (dic) &&
2056 IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2057 isOperandInFarSpace (IC_RESULT (dic)))
2060 if (IC_RIGHT (dic) &&
2061 IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
2062 isOperandInFarSpace (IC_RIGHT (dic)) &&
2063 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
2066 if (IC_LEFT (dic) &&
2067 IS_TRUE_SYMOP (IC_LEFT (dic)) &&
2068 isOperandInFarSpace (IC_LEFT (dic)) &&
2069 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
2072 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
2074 if ((dic->op == LEFT_OP ||
2075 dic->op == RIGHT_OP ||
2077 IS_OP_LITERAL (IC_RIGHT (dic)))
2087 /*-----------------------------------------------------------------*/
2088 /* packRegsForAssign - register reduction for assignment */
2089 /*-----------------------------------------------------------------*/
2091 packRegsForAssign (iCode * ic, eBBlock * ebp)
2096 debugLog ("%s\n", __FUNCTION__);
2098 debugAopGet (" result:", IC_RESULT (ic));
2099 debugAopGet (" left:", IC_LEFT (ic));
2100 debugAopGet (" right:", IC_RIGHT (ic));
2102 if (!IS_ITEMP (IC_RIGHT (ic)) ||
2103 OP_SYMBOL (IC_RIGHT (ic))->isind ||
2104 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
2106 debugLog (" %d - not packing - right side fails \n", __LINE__);
2110 /* if the true symbol is defined in far space or on stack
2111 then we should not since this will increase register pressure */
2112 if (isOperandInFarSpace (IC_RESULT (ic)))
2114 if ((dic = farSpacePackable (ic)))
2120 /* find the definition of iTempNN scanning backwards if we find a
2121 a use of the true symbol before we find the definition then
2123 for (dic = ic->prev; dic; dic = dic->prev)
2126 /* if there is a function call and this is
2127 a parameter & not my parameter then don't pack it */
2128 if ((dic->op == CALL || dic->op == PCALL) &&
2129 (OP_SYMBOL (IC_RESULT (ic))->_isparm &&
2130 !OP_SYMBOL (IC_RESULT (ic))->ismyparm))
2132 debugLog (" %d - \n", __LINE__);
2140 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
2141 IS_OP_VOLATILE (IC_RESULT (dic)))
2143 debugLog (" %d - \n", __LINE__);
2148 if (IS_SYMOP (IC_RESULT (dic)) &&
2149 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
2151 debugLog (" %d - dic key == ic key -- pointer set=%c\n", __LINE__, ((POINTER_SET (dic)) ? 'Y' : 'N'));
2152 if (POINTER_SET (dic))
2158 if (IS_SYMOP (IC_RIGHT (dic)) &&
2159 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
2160 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2162 debugLog (" %d - \n", __LINE__);
2167 if (IS_SYMOP (IC_LEFT (dic)) &&
2168 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2169 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2171 debugLog (" %d - \n", __LINE__);
2176 if (POINTER_SET (dic) &&
2177 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
2179 debugLog (" %d - \n", __LINE__);
2186 return 0; /* did not find */
2188 /* if the result is on stack or iaccess then it must be
2189 the same atleast one of the operands */
2190 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
2191 OP_SYMBOL (IC_RESULT (ic))->iaccess)
2194 /* the operation has only one symbol
2195 operator then we can pack */
2196 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
2197 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
2200 if (!((IC_LEFT (dic) &&
2201 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
2203 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
2207 debugLog (" packing. removing %s\n", OP_SYMBOL (IC_RIGHT (ic))->rname);
2208 /* found the definition */
2209 /* replace the result with the result of */
2210 /* this assignment and remove this assignment */
2211 IC_RESULT (dic) = IC_RESULT (ic);
2213 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
2215 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
2217 /* delete from liverange table also
2218 delete from all the points inbetween and the new
2220 for (sic = dic; sic != ic; sic = sic->next)
2222 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
2223 if (IS_ITEMP (IC_RESULT (dic)))
2224 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
2227 remiCodeFromeBBlock (ebp, ic);
2228 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2229 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2235 /*-----------------------------------------------------------------*/
2236 /* findAssignToSym : scanning backwards looks for first assig found */
2237 /*-----------------------------------------------------------------*/
2239 findAssignToSym (operand * op, iCode * ic)
2243 debugLog ("%s\n", __FUNCTION__);
2244 for (dic = ic->prev; dic; dic = dic->prev)
2247 /* if definition by assignment */
2248 if (dic->op == '=' &&
2249 !POINTER_SET (dic) &&
2250 IC_RESULT (dic)->key == op->key
2251 /* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
2255 /* we are interested only if defined in far space */
2256 /* or in stack space in case of + & - */
2258 /* if assigned to a non-symbol then return
2260 if (!IS_SYMOP (IC_RIGHT (dic)))
2263 /* if the symbol is in far space then
2265 if (isOperandInFarSpace (IC_RIGHT (dic)))
2268 /* for + & - operations make sure that
2269 if it is on the stack it is the same
2270 as one of the three operands */
2271 if ((ic->op == '+' || ic->op == '-') &&
2272 OP_SYMBOL (IC_RIGHT (dic))->onStack)
2275 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
2276 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
2277 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
2285 /* if we find an usage then we cannot delete it */
2286 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
2289 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
2292 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
2296 /* now make sure that the right side of dic
2297 is not defined between ic & dic */
2300 iCode *sic = dic->next;
2302 for (; sic != ic; sic = sic->next)
2303 if (IC_RESULT (sic) &&
2304 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
2313 /*-----------------------------------------------------------------*/
2314 /* packRegsForSupport :- reduce some registers for support calls */
2315 /*-----------------------------------------------------------------*/
2317 packRegsForSupport (iCode * ic, eBBlock * ebp)
2321 debugLog ("%s\n", __FUNCTION__);
2322 /* for the left & right operand :- look to see if the
2323 left was assigned a true symbol in far space in that
2324 case replace them */
2325 if (IS_ITEMP (IC_LEFT (ic)) &&
2326 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
2328 iCode *dic = findAssignToSym (IC_LEFT (ic), ic);
2334 debugAopGet ("removing left:", IC_LEFT (ic));
2336 /* found it we need to remove it from the
2338 for (sic = dic; sic != ic; sic = sic->next)
2339 bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
2341 IC_LEFT (ic)->operand.symOperand =
2342 IC_RIGHT (dic)->operand.symOperand;
2343 IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
2344 remiCodeFromeBBlock (ebp, dic);
2345 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2349 /* do the same for the right operand */
2352 IS_ITEMP (IC_RIGHT (ic)) &&
2353 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
2355 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
2361 /* if this is a subtraction & the result
2362 is a true symbol in far space then don't pack */
2363 if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
2365 sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
2366 if (IN_FARSPACE (SPEC_OCLS (etype)))
2370 debugAopGet ("removing right:", IC_RIGHT (ic));
2372 /* found it we need to remove it from the
2374 for (sic = dic; sic != ic; sic = sic->next)
2375 bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
2377 IC_RIGHT (ic)->operand.symOperand =
2378 IC_RIGHT (dic)->operand.symOperand;
2379 IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
2381 remiCodeFromeBBlock (ebp, dic);
2382 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2389 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
2392 /*-----------------------------------------------------------------*/
2393 /* packRegsForOneuse : - will reduce some registers for single Use */
2394 /*-----------------------------------------------------------------*/
2396 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
2401 debugLog ("%s\n", __FUNCTION__);
2402 /* if returning a literal then do nothing */
2406 /* only upto 2 bytes since we cannot predict
2407 the usage of b, & acc */
2408 if (getSize (operandType (op)) > (fReturnSizePic - 2) &&
2413 /* this routine will mark the a symbol as used in one
2414 instruction use only && if the definition is local
2415 (ie. within the basic block) && has only one definition &&
2416 that definition is either a return value from a
2417 function or does not contain any variables in
2419 uses = bitVectCopy (OP_USES (op));
2420 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
2421 if (!bitVectIsZero (uses)) /* has other uses */
2424 /* if it has only one defintion */
2425 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
2426 return NULL; /* has more than one definition */
2428 /* get that definition */
2430 hTabItemWithKey (iCodehTab,
2431 bitVectFirstBit (OP_DEFS (op)))))
2434 /* found the definition now check if it is local */
2435 if (dic->seq < ebp->fSeq ||
2436 dic->seq > ebp->lSeq)
2437 return NULL; /* non-local */
2439 /* now check if it is the return from
2441 if (dic->op == CALL || dic->op == PCALL)
2443 if (ic->op != SEND && ic->op != RETURN)
2445 OP_SYMBOL (op)->ruonly = 1;
2452 /* otherwise check that the definition does
2453 not contain any symbols in far space */
2454 if (isOperandInFarSpace (IC_LEFT (dic)) ||
2455 isOperandInFarSpace (IC_RIGHT (dic)) ||
2456 IS_OP_RUONLY (IC_LEFT (ic)) ||
2457 IS_OP_RUONLY (IC_RIGHT (ic)))
2462 /* if pointer set then make sure the pointer
2464 if (POINTER_SET (dic) &&
2465 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
2468 if (POINTER_GET (dic) &&
2469 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
2474 /* also make sure the intervenening instructions
2475 don't have any thing in far space */
2476 for (dic = dic->next; dic && dic != ic; dic = dic->next)
2479 /* if there is an intervening function call then no */
2480 if (dic->op == CALL || dic->op == PCALL)
2482 /* if pointer set then make sure the pointer
2484 if (POINTER_SET (dic) &&
2485 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
2488 if (POINTER_GET (dic) &&
2489 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
2492 /* if address of & the result is remat then okay */
2493 if (dic->op == ADDRESS_OF &&
2494 OP_SYMBOL (IC_RESULT (dic))->remat)
2497 /* if operand has size of three or more & this
2498 operation is a '*','/' or '%' then 'b' may
2500 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
2501 getSize (operandType (op)) >= 3)
2504 /* if left or right or result is in far space */
2505 if (isOperandInFarSpace (IC_LEFT (dic)) ||
2506 isOperandInFarSpace (IC_RIGHT (dic)) ||
2507 isOperandInFarSpace (IC_RESULT (dic)) ||
2508 IS_OP_RUONLY (IC_LEFT (dic)) ||
2509 IS_OP_RUONLY (IC_RIGHT (dic)) ||
2510 IS_OP_RUONLY (IC_RESULT (dic)))
2516 OP_SYMBOL (op)->ruonly = 1;
2521 /*-----------------------------------------------------------------*/
2522 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
2523 /*-----------------------------------------------------------------*/
2525 isBitwiseOptimizable (iCode * ic)
2527 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
2528 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
2530 debugLog ("%s\n", __FUNCTION__);
2531 /* bitwise operations are considered optimizable
2532 under the following conditions (Jean-Louis VERN)
2544 if (IS_LITERAL (rtype) ||
2545 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
2551 /*-----------------------------------------------------------------*/
2552 /* packRegsForAccUse - pack registers for acc use */
2553 /*-----------------------------------------------------------------*/
2555 packRegsForAccUse (iCode * ic)
2559 debugLog ("%s\n", __FUNCTION__);
2560 /* if + or - then it has to be one byte result */
2561 if ((ic->op == '+' || ic->op == '-')
2562 && getSize (operandType (IC_RESULT (ic))) > 1)
2565 /* if shift operation make sure right side is not a literal */
2566 if (ic->op == RIGHT_OP &&
2567 (isOperandLiteral (IC_RIGHT (ic)) ||
2568 getSize (operandType (IC_RESULT (ic))) > 1))
2571 if (ic->op == LEFT_OP &&
2572 (isOperandLiteral (IC_RIGHT (ic)) ||
2573 getSize (operandType (IC_RESULT (ic))) > 1))
2576 if (IS_BITWISE_OP (ic) &&
2577 getSize (operandType (IC_RESULT (ic))) > 1)
2581 /* has only one definition */
2582 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
2585 /* has only one use */
2586 if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
2589 /* and the usage immediately follows this iCode */
2590 if (!(uic = hTabItemWithKey (iCodehTab,
2591 bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
2594 if (ic->next != uic)
2597 /* if it is a conditional branch then we definitely can */
2601 if (uic->op == JUMPTABLE)
2604 /* if the usage is not is an assignment
2605 or an arithmetic / bitwise / shift operation then not */
2606 if (POINTER_SET (uic) &&
2607 getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
2610 if (uic->op != '=' &&
2611 !IS_ARITHMETIC_OP (uic) &&
2612 !IS_BITWISE_OP (uic) &&
2613 uic->op != LEFT_OP &&
2614 uic->op != RIGHT_OP)
2617 /* if used in ^ operation then make sure right is not a
2619 if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
2622 /* if shift operation make sure right side is not a literal */
2623 if (uic->op == RIGHT_OP &&
2624 (isOperandLiteral (IC_RIGHT (uic)) ||
2625 getSize (operandType (IC_RESULT (uic))) > 1))
2628 if (uic->op == LEFT_OP &&
2629 (isOperandLiteral (IC_RIGHT (uic)) ||
2630 getSize (operandType (IC_RESULT (uic))) > 1))
2633 /* make sure that the result of this icode is not on the
2634 stack, since acc is used to compute stack offset */
2635 if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
2636 OP_SYMBOL (IC_RESULT (uic))->onStack)
2639 /* if either one of them in far space then we cannot */
2640 if ((IS_TRUE_SYMOP (IC_LEFT (uic)) &&
2641 isOperandInFarSpace (IC_LEFT (uic))) ||
2642 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
2643 isOperandInFarSpace (IC_RIGHT (uic))))
2646 /* if the usage has only one operand then we can */
2647 if (IC_LEFT (uic) == NULL ||
2648 IC_RIGHT (uic) == NULL)
2651 /* make sure this is on the left side if not
2652 a '+' since '+' is commutative */
2653 if (ic->op != '+' &&
2654 IC_LEFT (uic)->key != IC_RESULT (ic)->key)
2657 /* if one of them is a literal then we can */
2658 if ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
2659 (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic))))
2661 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
2665 /* if the other one is not on stack then we can */
2666 if (IC_LEFT (uic)->key == IC_RESULT (ic)->key &&
2667 (IS_ITEMP (IC_RIGHT (uic)) ||
2668 (IS_TRUE_SYMOP (IC_RIGHT (uic)) &&
2669 !OP_SYMBOL (IC_RIGHT (uic))->onStack)))
2672 if (IC_RIGHT (uic)->key == IC_RESULT (ic)->key &&
2673 (IS_ITEMP (IC_LEFT (uic)) ||
2674 (IS_TRUE_SYMOP (IC_LEFT (uic)) &&
2675 !OP_SYMBOL (IC_LEFT (uic))->onStack)))
2681 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
2686 /*-----------------------------------------------------------------*/
2687 /* packForPush - hueristics to reduce iCode for pushing */
2688 /*-----------------------------------------------------------------*/
2690 packForReceive (iCode * ic, eBBlock * ebp)
2694 debugLog ("%s\n", __FUNCTION__);
2695 debugAopGet (" result:", IC_RESULT (ic));
2696 debugAopGet (" left:", IC_LEFT (ic));
2697 debugAopGet (" right:", IC_RIGHT (ic));
2702 for (dic = ic->next; dic; dic = dic->next)
2707 if (IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key))
2708 debugLog (" used on left\n");
2709 if (IC_RIGHT (dic) && IC_RESULT (ic)->key == IC_RIGHT (dic)->key)
2710 debugLog (" used on right\n");
2711 if (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key)
2712 debugLog (" used on result\n");
2714 if ((IC_LEFT (dic) && (IC_RESULT (ic)->key == IC_LEFT (dic)->key)) ||
2715 (IC_RESULT (dic) && IC_RESULT (ic)->key == IC_RESULT (dic)->key))
2720 debugLog (" hey we can remove this unnecessary assign\n");
2722 /*-----------------------------------------------------------------*/
2723 /* packForPush - hueristics to reduce iCode for pushing */
2724 /*-----------------------------------------------------------------*/
2726 packForPush (iCode * ic, eBBlock * ebp)
2730 debugLog ("%s\n", __FUNCTION__);
2731 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
2734 /* must have only definition & one usage */
2735 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
2736 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
2739 /* find the definition */
2740 if (!(dic = hTabItemWithKey (iCodehTab,
2741 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
2744 if (dic->op != '=' || POINTER_SET (dic))
2747 /* we now we know that it has one & only one def & use
2748 and the that the definition is an assignment */
2749 IC_LEFT (ic) = IC_RIGHT (dic);
2751 remiCodeFromeBBlock (ebp, dic);
2752 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2755 /*-----------------------------------------------------------------*/
2756 /* packRegisters - does some transformations to reduce register */
2758 /*-----------------------------------------------------------------*/
2760 packRegisters (eBBlock * ebp)
2765 debugLog ("%s\n", __FUNCTION__);
2772 /* look for assignments of the form */
2773 /* iTempNN = TRueSym (someoperation) SomeOperand */
2775 /* TrueSym := iTempNN:1 */
2776 for (ic = ebp->sch; ic; ic = ic->next)
2779 /* find assignment of the form TrueSym := iTempNN:1 */
2780 if (ic->op == '=' && !POINTER_SET (ic))
2781 change += packRegsForAssign (ic, ebp);
2785 if (POINTER_SET (ic))
2786 debugLog ("pointer is set\n");
2787 debugAopGet (" result:", IC_RESULT (ic));
2788 debugAopGet (" left:", IC_LEFT (ic));
2789 debugAopGet (" right:", IC_RIGHT (ic));
2798 for (ic = ebp->sch; ic; ic = ic->next)
2801 /* if this is an itemp & result of a address of a true sym
2802 then mark this as rematerialisable */
2803 if (ic->op == ADDRESS_OF &&
2804 IS_ITEMP (IC_RESULT (ic)) &&
2805 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
2806 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
2807 !OP_SYMBOL (IC_LEFT (ic))->onStack)
2810 debugLog (" %d - %s. result is rematerializable\n", __LINE__,__FUNCTION__);
2812 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2813 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2814 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2818 /* if straight assignment then carry remat flag if
2819 this is the only definition */
2820 if (ic->op == '=' &&
2821 !POINTER_SET (ic) &&
2822 IS_SYMOP (IC_RIGHT (ic)) &&
2823 OP_SYMBOL (IC_RIGHT (ic))->remat &&
2824 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
2826 debugLog (" %d - %s. straight rematerializable\n", __LINE__,__FUNCTION__);
2828 OP_SYMBOL (IC_RESULT (ic))->remat =
2829 OP_SYMBOL (IC_RIGHT (ic))->remat;
2830 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
2831 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
2834 /* if this is a +/- operation with a rematerizable
2835 then mark this as rematerializable as well */
2836 if ((ic->op == '+' || ic->op == '-') &&
2837 (IS_SYMOP (IC_LEFT (ic)) &&
2838 IS_ITEMP (IC_RESULT (ic)) &&
2839 OP_SYMBOL (IC_LEFT (ic))->remat &&
2840 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
2841 IS_OP_LITERAL (IC_RIGHT (ic))))
2843 debugLog (" %d - %s. rematerializable because op is +/-\n", __LINE__,__FUNCTION__);
2845 operandLitValue (IC_RIGHT (ic));
2846 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2847 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2848 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2851 /* mark the pointer usages */
2852 if (POINTER_SET (ic))
2854 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
2855 debugLog (" marking as a pointer (set) =>");
2856 debugAopGet (" result:", IC_RESULT (ic));
2858 if (POINTER_GET (ic))
2860 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
2861 debugLog (" marking as a pointer (get) =>");
2862 debugAopGet (" left:", IC_LEFT (ic));
2867 /* if we are using a symbol on the stack
2868 then we should say pic14_ptrRegReq */
2869 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
2870 pic14_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
2871 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
2872 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
2873 pic14_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
2874 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
2877 if (IS_SYMOP (IC_LEFT (ic)))
2878 pic14_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
2879 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
2880 if (IS_SYMOP (IC_RIGHT (ic)))
2881 pic14_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
2882 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
2883 if (IS_SYMOP (IC_RESULT (ic)))
2884 pic14_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
2885 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
2889 /* if the condition of an if instruction
2890 is defined in the previous instruction then
2891 mark the itemp as a conditional */
2892 if ((IS_CONDITIONAL (ic) ||
2893 ((ic->op == BITWISEAND ||
2896 isBitwiseOptimizable (ic))) &&
2897 ic->next && ic->next->op == IFX &&
2898 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
2899 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
2902 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
2906 /* reduce for support function calls */
2907 if (ic->supportRtn || ic->op == '+' || ic->op == '-')
2908 packRegsForSupport (ic, ebp);
2910 /* if a parameter is passed, it's in W, so we may not
2911 need to place a copy in a register */
2912 if (ic->op == RECEIVE)
2913 packForReceive (ic, ebp);
2915 /* some cases the redundant moves can
2916 can be eliminated for return statements */
2917 if ((ic->op == RETURN || ic->op == SEND) &&
2918 !isOperandInFarSpace (IC_LEFT (ic)) &&
2920 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
2922 /* if pointer set & left has a size more than
2923 one and right is not in far space */
2924 if (POINTER_SET (ic) &&
2925 !isOperandInFarSpace (IC_RIGHT (ic)) &&
2926 !OP_SYMBOL (IC_RESULT (ic))->remat &&
2927 !IS_OP_RUONLY (IC_RIGHT (ic)) &&
2928 getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
2930 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
2932 /* if pointer get */
2933 if (POINTER_GET (ic) &&
2934 !isOperandInFarSpace (IC_RESULT (ic)) &&
2935 !OP_SYMBOL (IC_LEFT (ic))->remat &&
2936 !IS_OP_RUONLY (IC_RESULT (ic)) &&
2937 getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
2939 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
2942 /* if this is cast for intergral promotion then
2943 check if only use of the definition of the
2944 operand being casted/ if yes then replace
2945 the result of that arithmetic operation with
2946 this result and get rid of the cast */
2949 sym_link *fromType = operandType (IC_RIGHT (ic));
2950 sym_link *toType = operandType (IC_LEFT (ic));
2952 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
2953 getSize (fromType) != getSize (toType))
2956 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
2959 if (IS_ARITHMETIC_OP (dic))
2961 IC_RESULT (dic) = IC_RESULT (ic);
2962 remiCodeFromeBBlock (ebp, ic);
2963 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2964 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2968 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
2974 /* if the type from and type to are the same
2975 then if this is the only use then packit */
2976 if (compareType (operandType (IC_RIGHT (ic)),
2977 operandType (IC_LEFT (ic))) == 1)
2979 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
2982 IC_RESULT (dic) = IC_RESULT (ic);
2983 remiCodeFromeBBlock (ebp, ic);
2984 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2985 OP_DEFS (IC_RESULT (dic)) = bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2993 iTempNN := (some variable in farspace) V1
2998 if (ic->op == IPUSH)
3000 packForPush (ic, ebp);
3004 /* pack registers for accumulator use, when the
3005 result of an arithmetic or bit wise operation
3006 has only one use, that use is immediately following
3007 the defintion and the using iCode has only one
3008 operand or has two operands but one is literal &
3009 the result of that operation is not on stack then
3010 we can leave the result of this operation in acc:b
3012 if ((IS_ARITHMETIC_OP (ic)
3014 || IS_BITWISE_OP (ic)
3016 || ic->op == LEFT_OP || ic->op == RIGHT_OP
3019 IS_ITEMP (IC_RESULT (ic)) &&
3020 getSize (operandType (IC_RESULT (ic))) <= 2)
3022 packRegsForAccUse (ic);
3028 dumpEbbsToDebug (eBBlock ** ebbs, int count)
3032 if (!debug || !debugF)
3035 for (i = 0; i < count; i++)
3037 fprintf (debugF, "\n----------------------------------------------------------------\n");
3038 fprintf (debugF, "Basic Block %s : loop Depth = %d noPath = %d , lastinLoop = %d\n",
3039 ebbs[i]->entryLabel->name,
3042 ebbs[i]->isLastInLoop);
3043 fprintf (debugF, "depth 1st num %d : bbnum = %d 1st iCode = %d , last iCode = %d\n",
3048 fprintf (debugF, "visited %d : hasFcall = %d\n",
3052 fprintf (debugF, "\ndefines bitVector :");
3053 bitVectDebugOn (ebbs[i]->defSet, debugF);
3054 fprintf (debugF, "\nlocal defines bitVector :");
3055 bitVectDebugOn (ebbs[i]->ldefs, debugF);
3056 fprintf (debugF, "\npointers Set bitvector :");
3057 bitVectDebugOn (ebbs[i]->ptrsSet, debugF);
3058 fprintf (debugF, "\nin pointers Set bitvector :");
3059 bitVectDebugOn (ebbs[i]->inPtrsSet, debugF);
3060 fprintf (debugF, "\ninDefs Set bitvector :");
3061 bitVectDebugOn (ebbs[i]->inDefs, debugF);
3062 fprintf (debugF, "\noutDefs Set bitvector :");
3063 bitVectDebugOn (ebbs[i]->outDefs, debugF);
3064 fprintf (debugF, "\nusesDefs Set bitvector :");
3065 bitVectDebugOn (ebbs[i]->usesDefs, debugF);
3066 fprintf (debugF, "\n----------------------------------------------------------------\n");
3067 printiCChain (ebbs[i]->sch, debugF);
3070 /*-----------------------------------------------------------------*/
3071 /* assignRegisters - assigns registers to each live range as need */
3072 /*-----------------------------------------------------------------*/
3074 pic14_assignRegisters (eBBlock ** ebbs, int count)
3079 debugLog ("<><><><><><><><><><><><><><><><><>\nstarting\t%s:%s", __FILE__, __FUNCTION__);
3080 debugLog ("ebbs before optimizing:\n");
3081 dumpEbbsToDebug (ebbs, count);
3083 setToNull ((void *) &_G.funcrUsed);
3084 pic14_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
3087 /* change assignments this will remove some
3088 live ranges reducing some register pressure */
3089 for (i = 0; i < count; i++)
3090 packRegisters (ebbs[i]);
3092 if (options.dump_pack)
3093 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
3095 /* first determine for each live range the number of
3096 registers & the type of registers required for each */
3099 /* and serially allocate registers */
3100 serialRegAssign (ebbs, count);
3102 /* if stack was extended then tell the user */
3105 /* werror(W_TOOMANY_SPILS,"stack", */
3106 /* _G.stackExtend,currFunc->name,""); */
3112 /* werror(W_TOOMANY_SPILS,"data space", */
3113 /* _G.dataExtend,currFunc->name,""); */
3117 /* after that create the register mask
3118 for each of the instruction */
3119 createRegMask (ebbs, count);
3121 /* redo that offsets for stacked automatic variables */
3122 redoStackOffsets ();
3124 if (options.dump_rassgn)
3125 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
3127 /* now get back the chain */
3128 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
3130 debugLog ("ebbs after optimizing:\n");
3131 dumpEbbsToDebug (ebbs, count);
3136 /* free up any _G.stackSpil locations allocated */
3137 applyToSet (_G.stackSpil, deallocStackSpil);
3139 setToNull ((void **) &_G.stackSpil);
3140 setToNull ((void **) &_G.spiltSet);
3141 /* mark all registers as free */
3142 pic14_freeAllRegs ();
3144 debugLog ("leaving\n<><><><><><><><><><><><><><><><><>\n");