1 /*------------------------------------------------------------------------
3 SDCCralloc.c - source file for register allocation. 68HC08 specific
5 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998)
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 In other words, you are welcome to use, share and improve this program.
22 You are forbidden to forbid anyone else to use, share and improve
23 what you give them. Help stamp out software-hoarding!
24 -------------------------------------------------------------------------*/
30 /*-----------------------------------------------------------------*/
31 /* At this point we start getting processor specific although */
32 /* some routines are non-processor specific & can be reused when */
33 /* targetting other processors. The decision for this will have */
34 /* to be made on a routine by routine basis */
35 /* routines used to pack registers are most definitely not reusable */
36 /* since the pack the registers depending strictly on the MCU */
37 /*-----------------------------------------------------------------*/
39 extern void genhc08Code (iCode *);
48 bitVect *totRegAssigned; /* final set of LRs that got into registers */
51 bitVect *funcrUsed; /* registers used in a function */
57 /* Shared with gen.c */
58 int hc08_ptrRegReq; /* one byte pointer register required */
64 {REG_GPR, A_IDX, "a", 1, NULL, 0, 1},
65 {REG_GPR, X_IDX, "x", 2, NULL, 0, 1},
66 {REG_GPR, H_IDX, "h", 4, NULL, 0, 1},
67 {REG_PTR, HX_IDX, "hx", 6, NULL, 0, 1},
68 {REG_GPR, XA_IDX, "xa", 3, NULL, 0, 1},
70 {REG_CND, CND_IDX, "C", 0, NULL, 0, 1},
71 {0, SP_IDX, "sp", 0, NULL, 0, 1},
82 static void spillThis (symbol *);
83 static void freeAllRegs ();
85 /*-----------------------------------------------------------------*/
86 /* allocReg - allocates register of given type */
87 /*-----------------------------------------------------------------*/
93 if ((type==REG_PTR) && (regshc08[HX_IDX].isFree))
95 regshc08[HX_IDX].isFree = 0;
98 bitVectSetBit (currFunc->regsUsed, HX_IDX);
99 return ®shc08[HX_IDX];
104 /*-----------------------------------------------------------------*/
105 /* hc08_regWithIdx - returns pointer to register wit index number */
106 /*-----------------------------------------------------------------*/
108 hc08_regWithIdx (int idx)
112 for (i = 0; i < hc08_nRegs; i++)
113 if (regshc08[i].rIdx == idx)
116 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
117 "regWithIdx not found");
121 /*-----------------------------------------------------------------*/
122 /* hc08_freeReg - frees a register */
123 /*-----------------------------------------------------------------*/
125 hc08_freeReg (regs * reg)
129 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
130 "hc08_freeReg - Freeing NULL register");
139 if (hc08_reg_x->isFree)
140 hc08_reg_xa->isFree = 1;
143 if (hc08_reg_a->isFree)
144 hc08_reg_xa->isFree = 1;
145 if (hc08_reg_h->isFree)
146 hc08_reg_hx->isFree = 1;
149 if (hc08_reg_x->isFree)
150 hc08_reg_hx->isFree = 1;
153 hc08_reg_h->isFree = 1;
154 hc08_reg_x->isFree = 1;
155 if (hc08_reg_a->isFree)
156 hc08_reg_xa->isFree = 1;
159 hc08_reg_x->isFree = 1;
160 hc08_reg_a->isFree = 1;
161 if (hc08_reg_h->isFree)
162 hc08_reg_hx->isFree = 1;
170 /*-----------------------------------------------------------------*/
171 /* nFreeRegs - returns number of free registers */
172 /*-----------------------------------------------------------------*/
181 for (i = 0; i < hc08_nRegs; i++)
182 if (regshc08[i].isFree && regshc08[i].type == type)
187 /*-----------------------------------------------------------------*/
188 /* nfreeRegsType - free registers with type */
189 /*-----------------------------------------------------------------*/
191 nfreeRegsType (int type)
196 if ((nfr = nFreeRegs (type)) == 0)
197 return nFreeRegs (REG_GPR);
200 return nFreeRegs (type);
203 /*-----------------------------------------------------------------*/
204 /* hc08_useReg - marks a register as used */
205 /*-----------------------------------------------------------------*/
207 hc08_useReg (regs * reg)
214 hc08_reg_xa->aop = NULL;
215 hc08_reg_xa->isFree = 0;
218 hc08_reg_xa->aop = NULL;
219 hc08_reg_xa->isFree = 0;
220 hc08_reg_hx->aop = NULL;
221 hc08_reg_hx->isFree = 0;
224 hc08_reg_hx->aop = NULL;
225 hc08_reg_hx->isFree = 0;
228 hc08_reg_h->aop = NULL;
229 hc08_reg_h->isFree = 0;
230 hc08_reg_x->aop = NULL;
231 hc08_reg_x->isFree = 0;
234 hc08_reg_x->aop = NULL;
235 hc08_reg_x->isFree = 0;
236 hc08_reg_a->aop = NULL;
237 hc08_reg_a->isFree = 0;
245 /*-----------------------------------------------------------------*/
246 /* hc08_dirtyReg - marks a register as dirty */
247 /*-----------------------------------------------------------------*/
249 hc08_dirtyReg (regs * reg, bool freereg)
256 hc08_reg_xa->aop = NULL;
259 hc08_reg_xa->aop = NULL;
260 hc08_reg_hx->aop = NULL;
263 hc08_reg_hx->aop = NULL;
266 hc08_reg_h->aop = NULL;
267 hc08_reg_x->aop = NULL;
270 hc08_reg_x->aop = NULL;
271 hc08_reg_a->aop = NULL;
280 /*-----------------------------------------------------------------*/
281 /* computeSpillable - given a point find the spillable live ranges */
282 /*-----------------------------------------------------------------*/
284 computeSpillable (iCode * ic)
288 /* spillable live ranges are those that are live at this
289 point . the following categories need to be subtracted
291 a) - those that are already spilt
292 b) - if being used by this one
293 c) - defined by this one */
295 spillable = bitVectCopy (ic->rlive);
297 bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
299 bitVectCplAnd (spillable, ic->uses); /* used in this one */
300 bitVectUnSetBit (spillable, ic->defKey);
301 spillable = bitVectIntersect (spillable, _G.regAssigned);
306 /*-----------------------------------------------------------------*/
307 /* noSpilLoc - return true if a variable has no spil location */
308 /*-----------------------------------------------------------------*/
310 noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
312 return (sym->usl.spillLoc ? 0 : 1);
315 /*-----------------------------------------------------------------*/
316 /* hasSpilLoc - will return 1 if the symbol has spil location */
317 /*-----------------------------------------------------------------*/
319 hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
321 return (sym->usl.spillLoc ? 1 : 0);
324 /*-----------------------------------------------------------------*/
325 /* directSpilLoc - will return 1 if the splilocation is in direct */
326 /*-----------------------------------------------------------------*/
328 directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
330 if (sym->usl.spillLoc &&
331 (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
337 /*-----------------------------------------------------------------*/
338 /* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
339 /* but is not used as a pointer */
340 /*-----------------------------------------------------------------*/
342 hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
344 return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
347 /*-----------------------------------------------------------------*/
348 /* rematable - will return 1 if the remat flag is set */
349 /*-----------------------------------------------------------------*/
351 rematable (symbol * sym, eBBlock * ebp, iCode * ic)
356 /*-----------------------------------------------------------------*/
357 /* notUsedInRemaining - not used or defined in remain of the block */
358 /*-----------------------------------------------------------------*/
360 notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
362 return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
363 allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
366 /*-----------------------------------------------------------------*/
367 /* allLRs - return true for all */
368 /*-----------------------------------------------------------------*/
370 allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
375 /*-----------------------------------------------------------------*/
376 /* liveRangesWith - applies function to a given set of live range */
377 /*-----------------------------------------------------------------*/
379 liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
380 eBBlock * ebp, iCode * ic)
385 if (!lrs || !lrs->size)
388 for (i = 1; i < lrs->size; i++)
391 if (!bitVectBitValue (lrs, i))
394 /* if we don't find it in the live range
395 hash table we are in serious trouble */
396 if (!(sym = hTabItemWithKey (liveRanges, i)))
398 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
399 "liveRangesWith could not find liveRange");
403 if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
404 addSetHead (&rset, sym);
411 /*-----------------------------------------------------------------*/
412 /* leastUsedLR - given a set determines which is the least used */
413 /*-----------------------------------------------------------------*/
415 leastUsedLR (set * sset)
417 symbol *sym = NULL, *lsym = NULL;
419 sym = lsym = setFirstItem (sset);
424 for (; lsym; lsym = setNextItem (sset))
427 /* if usage is the same then prefer
428 the spill the smaller of the two */
429 if (lsym->used == sym->used)
430 if (getSize (lsym->type) < getSize (sym->type))
434 if (lsym->used < sym->used)
439 setToNull ((void *) &sset);
444 /*-----------------------------------------------------------------*/
445 /* noOverLap - will iterate through the list looking for over lap */
446 /*-----------------------------------------------------------------*/
448 noOverLap (set * itmpStack, symbol * fsym)
453 for (sym = setFirstItem (itmpStack); sym;
454 sym = setNextItem (itmpStack))
456 if (bitVectBitValue(sym->clashes,fsym->key)) return 0;
462 /*-----------------------------------------------------------------*/
463 /* isFree - will return 1 if the a free spil location is found */
464 /*-----------------------------------------------------------------*/
469 V_ARG (symbol **, sloc);
470 V_ARG (symbol *, fsym);
472 /* if already found */
476 /* if it is free && and the itmp assigned to
477 this does not have any overlapping live ranges
478 with the one currently being assigned and
479 the size can be accomodated */
481 noOverLap (sym->usl.itmpStack, fsym) &&
482 getSize (sym->type) >= getSize (fsym->type))
491 /*-----------------------------------------------------------------*/
492 /* spillLRWithPtrReg :- will spil those live ranges which use PTR */
493 /*-----------------------------------------------------------------*/
495 spillLRWithPtrReg (symbol * forSym)
501 if (!_G.regAssigned ||
502 bitVectIsZero (_G.regAssigned))
505 hx = hc08_regWithIdx (HX_IDX);
507 /* for all live ranges */
508 for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
509 lrsym = hTabNextItem (liveRanges, &k))
513 /* if no registers assigned to it or spilt */
514 /* if it does not overlap with this then
515 not need to spill it */
517 if (lrsym->isspilt || !lrsym->nRegs ||
518 (lrsym->liveTo < forSym->liveFrom))
521 /* go thru the registers : if it is either
522 r0 or r1 then spil it */
523 for (j = 0; j < lrsym->nRegs; j++)
524 if (lrsym->regs[j] == hx)
533 /*-----------------------------------------------------------------*/
534 /* createStackSpil - create a location on the stack to spil */
535 /*-----------------------------------------------------------------*/
537 createStackSpil (symbol * sym)
540 int useXstack, model;
544 /* first go try and find a free one that is already
545 existing on the stack */
546 if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
548 /* found a free one : just update & return */
549 sym->usl.spillLoc = sloc;
552 addSetHead (&sloc->usl.itmpStack, sym);
556 /* could not then have to create one , this is the hard part
557 we need to allocate this on the stack : this is really a
558 hack!! but cannot think of anything better at this time */
560 if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
562 fprintf (stderr, "***Internal error: slocBuffer overflowed: %s:%d\n",
567 sloc = newiTemp (slocBuffer);
569 /* set the type to the spilling symbol */
570 sloc->type = copyLinkChain (sym->type);
571 sloc->etype = getSpec (sloc->type);
572 SPEC_SCLS (sloc->etype) = S_DATA;
573 SPEC_EXTR (sloc->etype) = 0;
574 SPEC_STAT (sloc->etype) = 0;
575 SPEC_VOLATILE(sloc->etype) = 0;
576 SPEC_ABSA(sloc->etype) = 0;
578 /* we don't allow it to be allocated`
579 onto the external stack since : so we
580 temporarily turn it off ; we also
581 turn off memory model to prevent
582 the spil from going to the external storage
585 useXstack = options.useXstack;
586 model = options.model;
587 /* noOverlay = options.noOverlay; */
588 /* options.noOverlay = 1; */
589 options.model = options.useXstack = 0;
593 options.useXstack = useXstack;
594 options.model = model;
595 /* options.noOverlay = noOverlay; */
596 sloc->isref = 1; /* to prevent compiler warning */
598 /* if it is on the stack then update the stack */
599 if (IN_STACK (sloc->etype))
601 currFunc->stack += getSize (sloc->type);
602 _G.stackExtend += getSize (sloc->type);
605 _G.dataExtend += getSize (sloc->type);
607 /* add it to the _G.stackSpil set */
608 addSetHead (&_G.stackSpil, sloc);
609 sym->usl.spillLoc = sloc;
612 /* add it to the set of itempStack set
613 of the spill location */
614 addSetHead (&sloc->usl.itmpStack, sym);
618 /*-----------------------------------------------------------------*/
619 /* isSpiltOnStack - returns true if the spil location is on stack */
620 /*-----------------------------------------------------------------*/
622 isSpiltOnStack (symbol * sym)
632 /* if (sym->_G.stackSpil) */
635 if (!sym->usl.spillLoc)
638 etype = getSpec (sym->usl.spillLoc->type);
639 if (IN_STACK (etype))
645 /*-----------------------------------------------------------------*/
646 /* spillThis - spils a specific operand */
647 /*-----------------------------------------------------------------*/
649 spillThis (symbol * sym)
652 /* if this is rematerializable or has a spillLocation
653 we are okay, else we need to create a spillLocation
655 if (!(sym->remat || sym->usl.spillLoc))
656 createStackSpil (sym);
658 /* mark it as spilt & put it in the spilt set */
659 sym->isspilt = sym->spillA = 1;
660 _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
662 bitVectUnSetBit (_G.regAssigned, sym->key);
663 bitVectUnSetBit (_G.totRegAssigned, sym->key);
665 for (i = 0; i < sym->nRegs; i++)
669 hc08_freeReg (sym->regs[i]);
673 /* if spilt on stack then free up r0 & r1
674 if they could have been assigned to some
676 // if (!hc08_ptrRegReq && isSpiltOnStack (sym))
679 // spillLRWithPtrReg (sym);
682 if (sym->usl.spillLoc && !sym->remat)
683 sym->usl.spillLoc->allocreq++;
687 /*-----------------------------------------------------------------*/
688 /* selectSpil - select a iTemp to spil : rather a simple procedure */
689 /*-----------------------------------------------------------------*/
691 selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
693 bitVect *lrcs = NULL;
697 /* get the spillable live ranges */
698 lrcs = computeSpillable (ic);
700 /* get all live ranges that are rematerizable */
701 if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
704 /* return the least used of these */
705 return leastUsedLR (selectS);
708 /* get live ranges with spillLocations in direct space */
709 if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
711 sym = leastUsedLR (selectS);
712 strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
713 sym->usl.spillLoc->rname :
714 sym->usl.spillLoc->name));
716 /* mark it as allocation required */
717 sym->usl.spillLoc->allocreq++;
721 /* if the symbol is local to the block then */
722 if (forSym->liveTo < ebp->lSeq)
725 /* check if there are any live ranges allocated
726 to registers that are not used in this block */
727 if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
729 sym = leastUsedLR (selectS);
730 /* if this is not rematerializable */
739 /* check if there are any live ranges that not
740 used in the remainder of the block */
742 !isiCodeInFunctionCall (ic) &&
743 (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
745 sym = leastUsedLR (selectS);
758 /* find live ranges with spillocation && not used as pointers */
759 if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
762 sym = leastUsedLR (selectS);
763 /* mark this as allocation required */
764 sym->usl.spillLoc->allocreq++;
768 /* find live ranges with spillocation */
769 if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
772 sym = leastUsedLR (selectS);
773 sym->usl.spillLoc->allocreq++;
777 /* couldn't find then we need to create a spil
778 location on the stack , for which one? the least
780 if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
783 /* return a created spil location */
784 sym = createStackSpil (leastUsedLR (selectS));
785 sym->usl.spillLoc->allocreq++;
789 /* this is an extreme situation we will spill
790 this one : happens very rarely but it does happen */
796 /*-----------------------------------------------------------------*/
797 /* spilSomething - spil some variable & mark registers as free */
798 /*-----------------------------------------------------------------*/
800 spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
805 /* get something we can spil */
806 ssym = selectSpil (ic, ebp, forSym);
808 /* mark it as spilt */
809 ssym->isspilt = ssym->spillA = 1;
810 _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
812 /* mark it as not register assigned &
813 take it away from the set */
814 bitVectUnSetBit (_G.regAssigned, ssym->key);
815 bitVectUnSetBit (_G.totRegAssigned, ssym->key);
817 /* mark the registers as free */
818 for (i = 0; i < ssym->nRegs; i++)
820 hc08_freeReg (ssym->regs[i]);
822 /* if spilt on stack then free up hx
823 if it could have been assigned to as gprs */
824 if (!hc08_ptrRegReq && isSpiltOnStack (ssym))
827 spillLRWithPtrReg (ssym);
830 /* if this was a block level spil then insert push & pop
831 at the start & end of block respectively */
834 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
835 /* add push to the start of the block */
836 addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
837 ebp->sch->next : ebp->sch));
838 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
839 /* add pop to the end of the block */
840 addiCodeToeBBlock (ebp, nic, NULL);
843 /* if spilt because not used in the remainder of the
844 block then add a push before this instruction and
845 a pop at the end of the block */
846 if (ssym->remainSpil)
849 iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
850 /* add push just before this instruction */
851 addiCodeToeBBlock (ebp, nic, ic);
853 nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
854 /* add pop to the end of the block */
855 addiCodeToeBBlock (ebp, nic, NULL);
864 /*-----------------------------------------------------------------*/
865 /* getRegPtr - will try for PTR if not a GPR type if not spil */
866 /*-----------------------------------------------------------------*/
868 getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
873 /* try for a ptr type */
874 if ((reg = allocReg (REG_PTR)))
877 /* try for gpr type */
878 if ((reg = allocReg (REG_GPR)))
881 /* we have to spil */
882 if (!spilSomething (ic, ebp, sym))
885 /* this looks like an infinite loop but
886 in really selectSpil will abort */
890 /*-----------------------------------------------------------------*/
891 /* getRegGpr - will try for GPR if not spil */
892 /*-----------------------------------------------------------------*/
894 getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
899 /* try for gpr type */
900 if ((reg = allocReg (REG_GPR)))
904 if ((reg = allocReg (REG_PTR)))
907 /* we have to spil */
908 if (!spilSomething (ic, ebp, sym))
911 /* this looks like an infinite loop but
912 in really selectSpil will abort */
916 /*-----------------------------------------------------------------*/
917 /* getRegPtrNoSpil - get it cannot split */
918 /*-----------------------------------------------------------------*/
919 static regs *getRegPtrNoSpil()
923 /* try for a ptr type */
924 if ((reg = allocReg (REG_PTR)))
927 /* try for gpr type */
928 if ((reg = allocReg (REG_GPR)))
933 /* just to make the compiler happy */
937 /*-----------------------------------------------------------------*/
938 /* getRegGprNoSpil - get it cannot split */
939 /*-----------------------------------------------------------------*/
940 static regs *getRegGprNoSpil()
944 if ((reg = allocReg (REG_GPR)))
948 if ((reg = allocReg (REG_PTR)))
953 /* just to make the compiler happy */
957 /*-----------------------------------------------------------------*/
958 /* symHasReg - symbol has a given register */
959 /*-----------------------------------------------------------------*/
961 symHasReg (symbol * sym, regs * reg)
965 for (i = 0; i < sym->nRegs; i++)
966 if (sym->regs[i] == reg)
972 /*-----------------------------------------------------------------*/
973 /* deassignLRs - check the live to and if they have registers & are */
974 /* not spilt then free up the registers */
975 /*-----------------------------------------------------------------*/
977 deassignLRs (iCode * ic, eBBlock * ebp)
983 for (sym = hTabFirstItem (liveRanges, &k); sym;
984 sym = hTabNextItem (liveRanges, &k))
988 /* if it does not end here */
989 if (sym->liveTo > ic->seq)
992 /* if it was spilt on stack then we can
993 mark the stack spil location as free */
998 sym->usl.spillLoc->isFree = 1;
1004 if (!bitVectBitValue (_G.regAssigned, sym->key))
1007 /* special case check if this is an IFX &
1008 the privious one was a pop and the
1009 previous one was not spilt then keep track
1011 if (ic->op == IFX && ic->prev &&
1012 ic->prev->op == IPOP &&
1013 !ic->prev->parmPush &&
1014 !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
1015 psym = OP_SYMBOL (IC_LEFT (ic->prev));
1021 bitVectUnSetBit (_G.regAssigned, sym->key);
1023 /* if the result of this one needs registers
1024 and does not have it then assign it right
1026 if (IC_RESULT (ic) &&
1027 !(SKIP_IC2 (ic) || /* not a special icode */
1028 ic->op == JUMPTABLE ||
1033 POINTER_SET (ic)) &&
1034 (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
1035 result->liveTo > ic->seq && /* and will live beyond this */
1036 result->liveTo <= ebp->lSeq && /* does not go beyond this block */
1037 result->liveFrom == ic->seq && /* does not start before here */
1038 result->regType == sym->regType && /* same register types */
1039 result->nRegs && /* which needs registers */
1040 !result->isspilt && /* and does not already have them */
1042 !bitVectBitValue (_G.regAssigned, result->key) &&
1043 /* the number of free regs + number of regs in this LR
1044 can accomodate the what result Needs */
1045 ((nfreeRegsType (result->regType) +
1046 sym->nRegs) >= result->nRegs)
1050 for (i = 0; i < result->nRegs; i++)
1052 result->regs[i] = sym->regs[i];
1054 result->regs[i] = getRegGpr (ic, ebp, result);
1056 _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
1057 _G.totRegAssigned = bitVectSetBit (_G.totRegAssigned, result->key);
1061 /* free the remaining */
1062 for (; i < sym->nRegs; i++)
1066 if (!symHasReg (psym, sym->regs[i]))
1067 hc08_freeReg (sym->regs[i]);
1070 hc08_freeReg (sym->regs[i]);
1077 /*-----------------------------------------------------------------*/
1078 /* reassignLR - reassign this to registers */
1079 /*-----------------------------------------------------------------*/
1081 reassignLR (operand * op)
1083 symbol *sym = OP_SYMBOL (op);
1086 /* not spilt any more */
1087 sym->isspilt = sym->spillA = sym->blockSpil = sym->remainSpil = 0;
1088 bitVectUnSetBit (_G.spiltSet, sym->key);
1090 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1091 _G.totRegAssigned = bitVectSetBit (_G.totRegAssigned, sym->key);
1095 for (i = 0; i < sym->nRegs; i++)
1096 sym->regs[i]->isFree = 0;
1099 /*-----------------------------------------------------------------*/
1100 /* willCauseSpill - determines if allocating will cause a spill */
1101 /*-----------------------------------------------------------------*/
1103 willCauseSpill (int nr, int rt)
1105 /* first check if there are any avlb registers
1106 of te type required */
1109 /* special case for pointer type
1110 if pointer type not avlb then
1111 check for type gpr */
1112 if (nFreeRegs (rt) >= nr)
1114 if (nFreeRegs (REG_GPR) >= nr)
1121 if (nFreeRegs (rt) >= nr)
1126 if (nFreeRegs (REG_PTR) +
1127 nFreeRegs (REG_GPR) >= nr)
1132 /* it will cause a spil */
1136 /*-----------------------------------------------------------------*/
1137 /* positionRegs - the allocator can allocate same registers to res- */
1138 /* ult and operand, if this happens make sure they are in the same */
1139 /* position as the operand otherwise chaos results */
1140 /*-----------------------------------------------------------------*/
1142 positionRegs (symbol * result, symbol * opsym)
1144 int count = min (result->nRegs, opsym->nRegs);
1145 int i, j = 0, shared = 0;
1148 /* if the result has been spilt then cannot share */
1153 /* first make sure that they actually share */
1154 for (i = 0; i < count; i++)
1156 for (j = 0; j < count; j++)
1158 if (result->regs[i] == opsym->regs[j] && i != j)
1168 regs *tmp = result->regs[i];
1169 result->regs[i] = result->regs[j];
1170 result->regs[j] = tmp;
1177 /*------------------------------------------------------------------*/
1178 /* verifyRegsAssigned - make sure an iTemp is properly initialized; */
1179 /* it should either have registers or have beed spilled. Otherwise, */
1180 /* there was an uninitialized variable, so just spill this to get */
1181 /* the operand in a valid state. */
1182 /*------------------------------------------------------------------*/
1184 verifyRegsAssigned (operand *op, iCode * ic)
1189 if (!IS_ITEMP (op)) return;
1191 sym = OP_SYMBOL (op);
1192 if (sym->isspilt) return;
1193 if (!sym->nRegs) return;
1194 if (sym->regs[0]) return;
1196 werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT,
1197 sym->prereqv ? sym->prereqv->name : sym->name);
1203 /*-----------------------------------------------------------------*/
1204 /* serialRegAssign - serially allocate registers to the variables */
1205 /*-----------------------------------------------------------------*/
1207 serialRegAssign (eBBlock ** ebbs, int count)
1211 /* for all blocks */
1212 for (i = 0; i < count; i++) {
1216 if (ebbs[i]->noPath &&
1217 (ebbs[i]->entryLabel != entryLabel &&
1218 ebbs[i]->entryLabel != returnLabel))
1221 /* of all instructions do */
1222 for (ic = ebbs[i]->sch; ic; ic = ic->next) {
1226 // update the registers in use at the start of this icode
1227 for (reg=0; reg<hc08_nRegs; reg++) {
1228 if (regshc08[reg].isFree) {
1229 ic->riu &= ~(regshc08[reg].mask);
1231 ic->riu |= (regshc08[reg].mask);
1236 /* if this is an ipop that means some live
1237 range will have to be assigned again */
1239 reassignLR (IC_LEFT (ic));
1241 /* if result is present && is a true symbol */
1242 if (IC_RESULT (ic) && ic->op != IFX &&
1243 IS_TRUE_SYMOP (IC_RESULT (ic)))
1244 OP_SYMBOL (IC_RESULT (ic))->allocreq++;
1246 /* take away registers from live
1247 ranges that end at this instruction */
1248 deassignLRs (ic, ebbs[i]);
1250 /* some don't need registers */
1251 if (SKIP_IC2 (ic) ||
1252 ic->op == JUMPTABLE ||
1256 (IC_RESULT (ic) && POINTER_SET (ic)))
1259 /* now we need to allocate registers
1260 only for the result */
1261 if (IC_RESULT (ic)) {
1262 symbol *sym = OP_SYMBOL (IC_RESULT (ic));
1268 /* if it does not need or is spilt
1269 or is already assigned to registers
1270 or will not live beyond this instructions */
1273 bitVectBitValue (_G.regAssigned, sym->key) ||
1274 sym->liveTo <= ic->seq)
1277 /* if some liverange has been spilt at the block level
1278 and this one live beyond this block then spil this
1280 if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq) {
1284 /* if trying to allocate this will cause
1285 a spill and there is nothing to spill
1286 or this one is rematerializable then
1288 willCS = willCauseSpill (sym->nRegs, sym->regType);
1289 spillable = computeSpillable (ic);
1290 if (sym->remat || (willCS && bitVectIsZero (spillable))) {
1295 /* If the live range preceeds the point of definition
1296 then ideally we must take into account registers that
1297 have been allocated after sym->liveFrom but freed
1298 before ic->seq. This is complicated, so spill this
1299 symbol instead and let fillGaps handle the allocation. */
1300 if (sym->liveFrom < ic->seq) {
1305 /* if it has a spillocation & is used less than
1306 all other live ranges then spill this */
1308 if (sym->usl.spillLoc) {
1309 symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
1310 allLRs, ebbs[i], ic));
1311 if (leastUsed && leastUsed->used > sym->used) {
1316 /* if none of the liveRanges have a spillLocation then better
1317 to spill this one than anything else already assigned to registers */
1318 if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
1319 /* if this is local to this block then we might find a block spil */
1320 if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
1327 /* if we need ptr regs for the right side
1329 if (POINTER_GET (ic) && IS_SYMOP (IC_LEFT (ic))
1330 && getSize (OP_SYMBOL (IC_LEFT (ic))->type) <= (unsigned int) PTRSIZE) {
1334 /* else we assign registers to it */
1335 _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
1336 _G.totRegAssigned = bitVectSetBit (_G.totRegAssigned, sym->key);
1338 for (j = 0; j < sym->nRegs; j++) {
1339 if (sym->regType == REG_PTR)
1340 sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
1342 sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
1344 /* if the allocation failed which means
1345 this was spilt then break */
1346 if (!sym->regs[j]) {
1351 /* if it shares registers with operands make sure
1352 that they are in the same position */
1353 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
1354 OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=') {
1355 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
1356 OP_SYMBOL (IC_LEFT (ic)));
1358 /* do the same for the right operand */
1359 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
1360 OP_SYMBOL (IC_RIGHT (ic))->nRegs) {
1361 positionRegs (OP_SYMBOL (IC_RESULT (ic)),
1362 OP_SYMBOL (IC_RIGHT (ic)));
1374 /* Check for and fix any problems with uninitialized operands */
1375 for (i = 0; i < count; i++)
1379 if (ebbs[i]->noPath &&
1380 (ebbs[i]->entryLabel != entryLabel &&
1381 ebbs[i]->entryLabel != returnLabel))
1384 for (ic = ebbs[i]->sch; ic; ic = ic->next)
1391 verifyRegsAssigned (IC_COND (ic), ic);
1395 if (ic->op == JUMPTABLE)
1397 verifyRegsAssigned (IC_JTCOND (ic), ic);
1401 verifyRegsAssigned (IC_RESULT (ic), ic);
1402 verifyRegsAssigned (IC_LEFT (ic), ic);
1403 verifyRegsAssigned (IC_RIGHT (ic), ic);
1409 /*-----------------------------------------------------------------*/
1410 /* fillGaps - Try to fill in the Gaps left by Pass1 */
1411 /*-----------------------------------------------------------------*/
1412 static void fillGaps()
1417 if (getenv("DISABLE_FILL_GAPS")) return;
1419 /* look for liveranges that were spilt by the allocator */
1420 for (sym = hTabFirstItem(liveRanges,&key) ; sym ;
1421 sym = hTabNextItem(liveRanges,&key)) {
1426 if (!sym->spillA || !sym->clashes || sym->remat) continue ;
1428 /* find the liveRanges this one clashes with, that are
1429 still assigned to registers & mark the registers as used*/
1430 for ( i = 0 ; i < sym->clashes->size ; i ++) {
1434 if (bitVectBitValue(sym->clashes,i) == 0 || /* those that clash with this */
1435 bitVectBitValue(_G.totRegAssigned,i) == 0) /* and are still assigned to registers */
1438 clr = hTabItemWithKey(liveRanges,i);
1441 /* mark these registers as used */
1442 for (k = 0 ; k < clr->nRegs ; k++ )
1443 hc08_useReg(clr->regs[k]);
1446 if (willCauseSpill(sym->nRegs,sym->regType)) {
1447 /* NOPE :( clear all registers & and continue */
1452 /* THERE IS HOPE !!!! */
1453 for (i=0; i < sym->nRegs ; i++ ) {
1454 if (sym->regType == REG_PTR)
1455 sym->regs[i] = getRegPtrNoSpil ();
1457 sym->regs[i] = getRegGprNoSpil ();
1460 /* for all its definitions check if the registers
1461 allocated needs positioning NOTE: we can position
1462 only ONCE if more than One positioning required
1465 for (i = 0 ; i < sym->defs->size ; i++ ) {
1466 if (bitVectBitValue(sym->defs,i)) {
1468 if (!(ic = hTabItemWithKey(iCodehTab,i))) continue ;
1469 if (SKIP_IC(ic)) continue;
1470 assert(isSymbolEqual(sym,OP_SYMBOL(IC_RESULT(ic)))); /* just making sure */
1471 /* if left is assigned to registers */
1472 if (IS_SYMOP(IC_LEFT(ic)) &&
1473 bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(IC_LEFT(ic))->key)) {
1474 pdone += positionRegs(sym,OP_SYMBOL(IC_LEFT(ic)));
1476 if (IS_SYMOP(IC_RIGHT(ic)) &&
1477 bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(IC_RIGHT(ic))->key)) {
1478 pdone += positionRegs(sym,OP_SYMBOL(IC_RIGHT(ic)));
1480 if (pdone > 1) break;
1483 for (i = 0 ; i < sym->uses->size ; i++ ) {
1484 if (bitVectBitValue(sym->uses,i)) {
1486 if (!(ic = hTabItemWithKey(iCodehTab,i))) continue ;
1487 if (SKIP_IC(ic)) continue;
1488 if (!IS_ASSIGN_ICODE(ic)) continue ;
1490 /* if result is assigned to registers */
1491 if (IS_SYMOP(IC_RESULT(ic)) &&
1492 bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(IC_RESULT(ic))->key)) {
1493 pdone += positionRegs(sym,OP_SYMBOL(IC_RESULT(ic)));
1495 if (pdone > 1) break;
1498 /* had to position more than once GIVE UP */
1500 /* UNDO all the changes we made to try this */
1502 for (i=0; i < sym->nRegs ; i++ ) {
1503 sym->regs[i] = NULL;
1506 D(printf ("Fill Gap gave up due to positioning for %s in function %s\n",sym->name, currFunc ? currFunc->name : "UNKNOWN"));
1509 D(printf ("FILLED GAP for %s in function %s\n",sym->name, currFunc ? currFunc->name : "UNKNOWN"));
1510 _G.totRegAssigned = bitVectSetBit(_G.totRegAssigned,sym->key);
1511 sym->isspilt = sym->spillA = 0 ;
1512 sym->usl.spillLoc->allocreq--;
1517 /*-----------------------------------------------------------------*/
1518 /* rUmaskForOp :- returns register mask for an operand */
1519 /*-----------------------------------------------------------------*/
1521 hc08_rUmaskForOp (operand * op)
1527 /* only temporaries are assigned registers */
1531 sym = OP_SYMBOL (op);
1533 /* if spilt or no registers assigned to it
1535 if (sym->isspilt || !sym->nRegs)
1538 rumask = newBitVect (hc08_nRegs);
1540 for (j = 0; j < sym->nRegs; j++)
1542 rumask = bitVectSetBit (rumask,
1543 sym->regs[j]->rIdx);
1549 /*-----------------------------------------------------------------*/
1550 /* regsUsedIniCode :- returns bit vector of registers used in iCode */
1551 /*-----------------------------------------------------------------*/
1553 regsUsedIniCode (iCode * ic)
1555 bitVect *rmask = newBitVect (hc08_nRegs);
1557 /* do the special cases first */
1560 rmask = bitVectUnion (rmask,
1561 hc08_rUmaskForOp (IC_COND (ic)));
1565 /* for the jumptable */
1566 if (ic->op == JUMPTABLE)
1568 rmask = bitVectUnion (rmask,
1569 hc08_rUmaskForOp (IC_JTCOND (ic)));
1574 /* of all other cases */
1576 rmask = bitVectUnion (rmask,
1577 hc08_rUmaskForOp (IC_LEFT (ic)));
1581 rmask = bitVectUnion (rmask,
1582 hc08_rUmaskForOp (IC_RIGHT (ic)));
1585 rmask = bitVectUnion (rmask,
1586 hc08_rUmaskForOp (IC_RESULT (ic)));
1592 /*-----------------------------------------------------------------*/
1593 /* createRegMask - for each instruction will determine the regsUsed */
1594 /*-----------------------------------------------------------------*/
1596 createRegMask (eBBlock ** ebbs, int count)
1600 /* for all blocks */
1601 for (i = 0; i < count; i++)
1605 if (ebbs[i]->noPath &&
1606 (ebbs[i]->entryLabel != entryLabel &&
1607 ebbs[i]->entryLabel != returnLabel))
1610 /* for all instructions */
1611 for (ic = ebbs[i]->sch; ic; ic = ic->next)
1616 if (SKIP_IC2 (ic) || !ic->rlive)
1619 /* first mark the registers used in this
1621 ic->rUsed = regsUsedIniCode (ic);
1622 _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
1624 /* now create the register mask for those
1625 registers that are in use : this is a
1626 super set of ic->rUsed */
1627 ic->rMask = newBitVect (hc08_nRegs + 1);
1629 /* for all live Ranges alive at this point */
1630 for (j = 1; j < ic->rlive->size; j++)
1635 /* if not alive then continue */
1636 if (!bitVectBitValue (ic->rlive, j))
1639 /* find the live range we are interested in */
1640 if (!(sym = hTabItemWithKey (liveRanges, j)))
1642 werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
1643 "createRegMask cannot find live range");
1644 fprintf(stderr, "\tmissing live range: key=%d\n", j);
1648 /* if no register assigned to it */
1649 if (!sym->nRegs || sym->isspilt)
1652 /* for all the registers allocated to it */
1653 for (k = 0; k < sym->nRegs; k++)
1656 bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
1662 /*-----------------------------------------------------------------*/
1663 /* rematStr - returns the rematerialized string for a remat var */
1664 /*-----------------------------------------------------------------*/
1666 rematStr (symbol * sym)
1669 iCode *ic = sym->rematiCode;
1674 /* if plus or minus print the right hand side */
1675 if (ic->op == '+' || ic->op == '-')
1677 sprintf (s, "0x%04x %c ", (int) operandLitValue (IC_RIGHT (ic)),
1680 ic = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
1687 offset += operandLitValue (IC_RIGHT (ic));
1688 ic = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
1693 offset -= operandLitValue (IC_RIGHT (ic));
1694 ic = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
1698 /* cast then continue */
1699 if (IS_CAST_ICODE(ic)) {
1700 ic = OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
1703 /* we reached the end */
1704 if (ic->op == ADDRESS_OF)
1705 sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
1706 else if (ic->op == '=')
1707 sprintf (s, "0x%04x", (int) operandLitValue (IC_RIGHT (ic)) );
1714 /*-----------------------------------------------------------------*/
1715 /* regTypeNum - computes the type & number of registers required */
1716 /*-----------------------------------------------------------------*/
1718 regTypeNum (eBBlock *ebbs)
1724 /* for each live range do */
1725 for (sym = hTabFirstItem (liveRanges, &k); sym;
1726 sym = hTabNextItem (liveRanges, &k))
1729 /* if used zero times then no registers needed */
1730 if ((sym->liveTo - sym->liveFrom) == 0)
1734 /* if the live range is a temporary */
1738 /* if the type is marked as a conditional */
1739 if (sym->regType == REG_CND)
1742 /* if used in return only then we don't
1744 if (sym->ruonly || sym->accuse)
1746 if (IS_AGGREGATE (sym->type) || sym->isptr)
1747 sym->type = aggrToPtr (sym->type, FALSE);
1751 /* if the symbol has only one definition &
1752 that definition is a get_pointer */
1753 if (bitVectnBitsOn (sym->defs) == 1 &&
1754 (ic = hTabItemWithKey (iCodehTab,
1755 bitVectFirstBit (sym->defs))) &&
1757 !IS_BITVAR (sym->etype) &&
1758 (aggrToPtrDclType (operandType (IC_LEFT (ic)), FALSE) == POINTER))
1761 if (ptrPseudoSymSafe (sym, ic))
1763 ptrPseudoSymConvert (sym, ic, rematStr (OP_SYMBOL (IC_LEFT (ic))));
1767 /* if in data space or idata space then try to
1768 allocate pointer register */
1772 /* if not then we require registers */
1773 sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
1774 getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
1775 getSize (sym->type));
1779 fprintf (stderr, "allocated more than 4 or 0 registers for type ");
1780 printTypeChain (sym->type, stderr);
1781 fprintf (stderr, "\n");
1784 /* determine the type of register required */
1785 if (sym->nRegs == 1 &&
1786 IS_PTR (sym->type) &&
1788 sym->regType = REG_PTR;
1790 sym->regType = REG_GPR;
1794 /* for the first run we don't provide */
1795 /* registers for true symbols we will */
1796 /* see how things go */
1802 /*-----------------------------------------------------------------*/
1803 /* freeAllRegs - mark all registers as free */
1804 /*-----------------------------------------------------------------*/
1810 for (i = 0; i < hc08_nRegs; i++) {
1811 regshc08[i].isFree = 1;
1812 regshc08[i].aop = NULL;
1816 /*-----------------------------------------------------------------*/
1817 /* deallocStackSpil - this will set the stack pointer back */
1818 /*-----------------------------------------------------------------*/
1820 DEFSETFUNC (deallocStackSpil)
1829 /*-----------------------------------------------------------------*/
1830 /* farSpacePackable - returns the packable icode for far variables */
1831 /*-----------------------------------------------------------------*/
1833 farSpacePackable (iCode * ic)
1837 /* go thru till we find a definition for the
1838 symbol on the right */
1839 for (dic = ic->prev; dic; dic = dic->prev)
1841 /* if the definition is a call then no */
1842 if ((dic->op == CALL || dic->op == PCALL) &&
1843 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
1848 /* if shift by unknown amount then not */
1849 if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
1850 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
1854 /* if pointer get and size > 1 */
1855 if (POINTER_GET (dic) &&
1856 getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
1859 if (POINTER_SET (dic) &&
1860 getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
1864 /* if any three is a true symbol in far space */
1865 if (IC_RESULT (dic) &&
1866 IS_TRUE_SYMOP (IC_RESULT (dic)) /* &&
1867 isOperandInFarSpace (IC_RESULT (dic)) */)
1870 if (IC_RIGHT (dic) &&
1871 IS_TRUE_SYMOP (IC_RIGHT (dic)) /* &&
1872 isOperandInFarSpace (IC_RIGHT (dic)) */ &&
1873 !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
1876 if (IC_LEFT (dic) &&
1877 IS_TRUE_SYMOP (IC_LEFT (dic)) /* &&
1878 isOperandInFarSpace (IC_LEFT (dic)) */ &&
1879 !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
1882 if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
1884 if ((dic->op == LEFT_OP ||
1885 dic->op == RIGHT_OP ||
1887 IS_OP_LITERAL (IC_RIGHT (dic)))
1900 packRegsForLiteral (iCode * ic)
1907 if (POINTER_SET (ic))
1909 if (!IS_LITERAL (getSpec (operandType (IC_RIGHT (ic)))))
1911 if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
1914 for (k=0; k< OP_USES (IC_RESULT (ic))->size; k++)
1915 if (bitVectBitValue (OP_USES (IC_RESULT (ic)), k))
1917 uic = hTabItemWithKey (iCodehTab, k);
1920 if (uic->op != IFX && uic->op != JUMPTABLE)
1922 if (IC_LEFT (uic) && IC_LEFT (uic)->key == IC_RESULT (ic)->key)
1923 ReplaceOpWithCheaperOp(&IC_LEFT(uic), IC_RIGHT(ic));
1924 if (IC_RIGHT (uic) && IC_RIGHT (uic)->key == IC_RESULT (ic)->key)
1925 ReplaceOpWithCheaperOp(&IC_RIGHT(uic), IC_RIGHT(ic));
1926 if (IC_RESULT (uic) && IC_RESULT (uic)->key == IC_RESULT (ic)->key)
1927 ReplaceOpWithCheaperOp(&IC_RESULT(uic), IC_RIGHT(ic));
1935 /*-----------------------------------------------------------------*/
1936 /* packRegsForAssign - register reduction for assignment */
1937 /*-----------------------------------------------------------------*/
1939 packRegsForAssign (iCode * ic, eBBlock * ebp)
1943 if (!IS_ITEMP (IC_RIGHT (ic)) ||
1944 OP_SYMBOL (IC_RIGHT (ic))->isind ||
1945 OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
1951 /* if the true symbol is defined in far space or on stack
1952 then we should not since this will increase register pressure */
1954 if (isOperandInFarSpace(IC_RESULT(ic)) && !farSpacePackable(ic)) {
1959 /* find the definition of iTempNN scanning backwards if we find a
1960 a use of the true symbol in before we find the definition then
1962 for (dic = ic->prev; dic; dic = dic->prev)
1965 #if 0 /* jwk: This collides with 1.43 but I really see no need for
1966 this anymore. It fixes bug #716790 and substantially improves
1967 redundant register usage around function calls.
1970 /* if there is a function call then don't pack it */
1971 if ((dic->op == CALL || dic->op == PCALL))
1981 if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
1982 IS_OP_VOLATILE (IC_RESULT (dic)))
1988 if (IS_SYMOP (IC_RESULT (dic)) &&
1989 IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
1991 if (POINTER_SET (dic))
1997 if (IS_SYMOP (IC_RIGHT (dic)) &&
1998 (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
1999 IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
2005 if (IS_SYMOP (IC_LEFT (dic)) &&
2006 (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
2007 IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
2013 if (POINTER_SET (dic) &&
2014 IC_RESULT (dic)->key == IC_RESULT (ic)->key)
2022 return 0; /* did not find */
2024 /* if assignment then check that right is not a bit */
2025 if (ASSIGNMENT (dic) && !POINTER_SET (dic))
2027 sym_link *etype = operandType (IC_RIGHT (dic));
2028 if (IS_BITFIELD (etype))
2030 /* if result is a bit too then it's ok */
2031 etype = operandType (IC_RESULT (dic));
2032 if (!IS_BITFIELD (etype))
2036 /* if the result is on stack or iaccess then it must be
2037 the same atleast one of the operands */
2038 if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
2039 OP_SYMBOL (IC_RESULT (ic))->iaccess)
2042 /* the operation has only one symbol
2043 operator then we can pack */
2044 if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
2045 (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
2048 if (!((IC_LEFT (dic) &&
2049 IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
2051 IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
2055 /* found the definition */
2056 /* replace the result with the result of */
2057 /* this assignment and remove this assignment */
2058 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
2059 ReplaceOpWithCheaperOp(&IC_RESULT (dic), IC_RESULT (ic));
2061 if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
2063 OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
2065 // TODO: and the otherway around?
2067 /* delete from liverange table also
2068 delete from all the points inbetween and the new
2070 for (sic = dic; sic != ic; sic = sic->next)
2072 bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
2073 if (IS_ITEMP (IC_RESULT (dic)))
2074 bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
2077 remiCodeFromeBBlock (ebp, ic);
2078 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
2079 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
2080 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
2085 /*------------------------------------------------------------------*/
2086 /* findAssignToSym : scanning backwards looks for first assig found */
2087 /*------------------------------------------------------------------*/
2089 findAssignToSym (operand * op, iCode * ic)
2093 /* This routine is used to find sequences like
2095 ...; (intervening ops don't use iTempAA or modify FOO)
2096 blah = blah + iTempAA;
2098 and eliminate the use of iTempAA, freeing up its register for
2103 for (dic = ic->prev; dic; dic = dic->prev)
2106 /* if definition by assignment */
2107 if (dic->op == '=' &&
2108 !POINTER_SET (dic) &&
2109 IC_RESULT (dic)->key == op->key
2110 && IS_TRUE_SYMOP(IC_RIGHT(dic))
2112 break; /* found where this temp was defined */
2114 /* if we find an usage then we cannot delete it */
2115 if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
2118 if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
2121 if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
2126 return NULL; /* didn't find any assignment to op */
2128 /* we are interested only if defined in far space */
2129 /* or in stack space in case of + & - */
2131 /* if assigned to a non-symbol then don't repack regs */
2132 if (!IS_SYMOP (IC_RIGHT (dic)))
2135 /* if the symbol is volatile then we should not */
2136 if (isOperandVolatile (IC_RIGHT (dic), TRUE))
2138 /* XXX TODO --- should we be passing FALSE to isOperandVolatile()?
2139 What does it mean for an iTemp to be volatile, anyway? Passing
2140 TRUE is more cautious but may prevent possible optimizations */
2142 /* if the symbol is in far space then we should not */
2143 /* if (isOperandInFarSpace (IC_RIGHT (dic)))
2146 /* for + & - operations make sure that
2147 if it is on the stack it is the same
2148 as one of the three operands */
2150 if ((ic->op == '+' || ic->op == '-') &&
2151 OP_SYMBOL (IC_RIGHT (dic))->onStack)
2154 if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
2155 IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
2156 IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
2161 /* now make sure that the right side of dic
2162 is not defined between ic & dic */
2165 iCode *sic = dic->next;
2167 for (; sic != ic; sic = sic->next)
2168 if (IC_RESULT (sic) &&
2169 IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
2176 /*-----------------------------------------------------------------*/
2177 /* reassignAliasedSym - used by packRegsForSupport to replace */
2178 /* redundant iTemp with equivalent symbol */
2179 /*-----------------------------------------------------------------*/
2181 reassignAliasedSym (eBBlock *ebp, iCode *assignment, iCode *use, operand *op)
2184 unsigned oldSymKey, newSymKey;
2186 oldSymKey = op->key;
2187 newSymKey = IC_RIGHT(assignment)->key;
2189 /* only track live ranges of compiler-generated temporaries */
2190 if (!IS_ITEMP(IC_RIGHT(assignment)))
2193 /* update the live-value bitmaps */
2194 for (ic = assignment; ic != use; ic = ic->next) {
2195 bitVectUnSetBit (ic->rlive, oldSymKey);
2197 ic->rlive = bitVectSetBit (ic->rlive, newSymKey);
2200 /* update the sym of the used operand */
2201 OP_SYMBOL(op) = OP_SYMBOL(IC_RIGHT(assignment));
2202 op->key = OP_SYMBOL(op)->key;
2204 /* update the sym's liverange */
2205 if ( OP_LIVETO(op) < ic->seq )
2206 setToRange(op, ic->seq, FALSE);
2208 /* remove the assignment iCode now that its result is unused */
2209 remiCodeFromeBBlock (ebp, assignment);
2210 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(assignment))->defs, assignment->key);
2211 hTabDeleteItem (&iCodehTab, assignment->key, assignment, DELETE_ITEM, NULL);
2215 /*-----------------------------------------------------------------*/
2216 /* packRegsForSupport :- reduce some registers for support calls */
2217 /*-----------------------------------------------------------------*/
2219 packRegsForSupport (iCode * ic, eBBlock * ebp)
2224 /* for the left & right operand :- look to see if the
2225 left was assigned a true symbol in far space in that
2226 case replace them */
2228 if (IS_ITEMP (IC_LEFT (ic)) &&
2229 OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
2231 dic = findAssignToSym (IC_LEFT (ic), ic);
2235 /* found it we need to remove it from the block */
2236 reassignAliasedSym (ebp, dic, ic, IC_LEFT(ic));
2241 /* do the same for the right operand */
2242 if (IS_ITEMP (IC_RIGHT (ic)) &&
2243 OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
2245 iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
2249 /* found it we need to remove it from the block */
2250 reassignAliasedSym (ebp, dic, ic, IC_RIGHT(ic));
2258 #define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
2262 /*-----------------------------------------------------------------*/
2263 /* packRegsForOneuse : - will reduce some registers for single Use */
2264 /*-----------------------------------------------------------------*/
2266 packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
2271 /* if returning a literal then do nothing */
2275 /* only up to 2 bytes */
2276 if (getSize (operandType (op)) > (fReturnSizeHC08 - 2))
2281 if (ic->op != SEND //RETURN
2283 && !POINTER_SET (ic)
2284 && !POINTER_GET (ic) )
2287 if (ic->op == SEND && ic->argreg != 1) return NULL;
2289 /* this routine will mark the a symbol as used in one
2290 instruction use only && if the defintion is local
2291 (ie. within the basic block) && has only one definition &&
2292 that definiion is either a return value from a
2293 function or does not contain any variables in
2295 uses = bitVectCopy (OP_USES (op));
2296 bitVectUnSetBit (uses, ic->key); /* take away this iCode */
2297 if (!bitVectIsZero (uses)) /* has other uses */
2300 /* if it has only one defintion */
2301 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
2302 return NULL; /* has more than one definition */
2304 /* get that definition */
2306 hTabItemWithKey (iCodehTab,
2307 bitVectFirstBit (OP_DEFS (op)))))
2310 /* if that only usage is a cast */
2311 if (dic->op == CAST) {
2312 /* to a bigger type */
2313 if (getSize(OP_SYM_TYPE(IC_RESULT(dic))) >
2314 getSize(OP_SYM_TYPE(IC_RIGHT(dic)))) {
2315 /* than we can not, since we cannot predict the usage of b & acc */
2320 /* found the definition now check if it is local */
2321 if (dic->seq < ebp->fSeq ||
2322 dic->seq > ebp->lSeq)
2323 return NULL; /* non-local */
2325 /* now check if it is the return from
2327 if (dic->op == CALL || dic->op == PCALL)
2329 if (ic->op != SEND && ic->op != RETURN &&
2330 !POINTER_SET(ic) && !POINTER_GET(ic))
2332 OP_SYMBOL (op)->ruonly = 1;
2339 /* otherwise check that the definition does
2340 not contain any symbols in far space */
2341 // if (isOperandInFarSpace (IC_LEFT (dic)) ||
2342 // isOperandInFarSpace (IC_RIGHT (dic)) ||
2343 // IS_OP_RUONLY (IC_LEFT (ic)) ||
2344 // IS_OP_RUONLY (IC_RIGHT (ic)))
2349 /* if pointer set then make sure the pointer
2352 if (POINTER_SET (dic) &&
2353 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
2356 if (POINTER_GET (dic) &&
2357 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
2363 /* also make sure the intervenening instructions
2364 don't have any thing in far space */
2365 for (dic = dic->next; dic && dic != ic && sic != ic; dic = dic->next)
2368 /* if there is an intervening function call then no */
2369 if (dic->op == CALL || dic->op == PCALL)
2371 /* if pointer set then make sure the pointer
2374 if (POINTER_SET (dic) &&
2375 !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
2378 if (POINTER_GET (dic) &&
2379 !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
2382 /* if address of & the result is remat the okay */
2383 if (dic->op == ADDRESS_OF &&
2384 OP_SYMBOL (IC_RESULT (dic))->remat)
2387 /* if operand has size of three or more & this
2388 operation is a '*','/' or '%' then 'b' may
2391 if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
2392 getSize (operandType (op)) >= 3)
2396 /* if left or right or result is in far space */
2397 // if (isOperandInFarSpace (IC_LEFT (dic)) ||
2398 // isOperandInFarSpace (IC_RIGHT (dic)) ||
2399 // isOperandInFarSpace (IC_RESULT (dic)) ||
2400 // IS_OP_RUONLY (IC_LEFT (dic)) ||
2401 // IS_OP_RUONLY (IC_RIGHT (dic)) ||
2402 // IS_OP_RUONLY (IC_RESULT (dic)))
2406 // /* if left or right or result is on stack */
2407 // if (isOperandOnStack(IC_LEFT(dic)) ||
2408 // isOperandOnStack(IC_RIGHT(dic)) ||
2409 // isOperandOnStack(IC_RESULT(dic))) {
2414 OP_SYMBOL (op)->ruonly = 1;
2419 /*-----------------------------------------------------------------*/
2420 /* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
2421 /*-----------------------------------------------------------------*/
2423 isBitwiseOptimizable (iCode * ic)
2425 sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
2426 sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
2428 /* bitwise operations are considered optimizable
2429 under the following conditions (Jean-Louis VERN)
2441 if (IS_LITERAL(rtype) ||
2442 (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
2448 /*-----------------------------------------------------------------*/
2449 /* isCommutativeOp - tests whether this op cares what order its */
2450 /* operands are in */
2451 /*-----------------------------------------------------------------*/
2452 bool isCommutativeOp2(unsigned int op)
2454 if (op == '+' || op == '*' || op == EQ_OP ||
2455 op == '^' || op == '|' || op == BITWISEAND)
2461 /*-----------------------------------------------------------------*/
2462 /* operandUsesAcc2 - determines whether the code generated for this */
2463 /* operand will have to use the accumulator */
2464 /*-----------------------------------------------------------------*/
2465 bool operandUsesAcc2(operand *op)
2471 symbol *sym = OP_SYMBOL(op);
2475 return TRUE; /* duh! */
2477 // if (IN_STACK(sym->etype) || sym->onStack ||
2478 // (SPIL_LOC(op) && SPIL_LOC(op)->onStack))
2479 // return TRUE; /* acc is used to calc stack offset */
2484 sym = SPIL_LOC(op); /* if spilled, look at spill location */
2486 return FALSE; /* more checks? */
2490 symspace = SPEC_OCLS(sym->etype);
2492 // if (sym->iaccess && symspace->paged)
2493 // return TRUE; /* must fetch paged indirect sym via accumulator */
2495 if (IN_BITSPACE(symspace))
2496 return TRUE; /* fetching bit vars uses the accumulator */
2498 if (IN_FARSPACE(symspace) || IN_CODESPACE(symspace))
2499 return TRUE; /* fetched via accumulator and dptr */
2505 /*-----------------------------------------------------------------*/
2506 /* canDefAccResult - return 1 if the iCode can generate a result */
2508 /*-----------------------------------------------------------------*/
2510 canDefAccResult (iCode * ic)
2514 if (ic->op == IFX || ic->op == JUMPTABLE) /* these iCodes have no result */
2517 if (POINTER_SET (ic))
2520 if (!IC_RESULT (ic))
2523 if (!IS_ITEMP (IC_RESULT (ic)))
2526 /* I don't think an iTemp can be an aggregate, but just in case */
2527 if (IS_AGGREGATE(operandType(IC_RESULT(ic))))
2530 size = getSize (operandType (IC_RESULT (ic)));
2534 /* All 1 byte operations should safely generate an accumulator result */
2543 return isOperandLiteral (IC_RIGHT (ic))
2544 && SPEC_USIGN (operandType (IC_RESULT (ic)));
2549 case '=': /* assignment, since POINTER_SET is already ruled out */
2560 /*-----------------------------------------------------------------*/
2561 /* canUseAccOperand - return 1 if the iCode can use the operand */
2562 /* when passed in A or XA */
2563 /*-----------------------------------------------------------------*/
2565 canUseAccOperand (iCode * ic, operand * op)
2572 if (isOperandEqual (op, IC_COND (ic)))
2578 if (ic->op == JUMPTABLE)
2580 if (isOperandEqual (op, IC_JTCOND (ic)))
2586 if (POINTER_SET (ic) && isOperandEqual (op, IC_RESULT (ic)))
2589 if (isOperandEqual (op, IC_LEFT (ic)))
2590 otherOp = IC_RIGHT (ic);
2591 else if (isOperandEqual (op, IC_RIGHT (ic)))
2592 otherOp = IC_LEFT (ic);
2596 /* Generation of SEND is deferred until CALL; not safe */
2597 /* if there are intermediate iCodes */
2598 if (ic->op == SEND && ic->next && ic->next->op != CALL)
2601 size = getSize (operandType (op));
2604 /* All 1 byte operations should safely use an accumulator operand */
2613 return isOperandLiteral (IC_RIGHT (ic));
2625 /*-----------------------------------------------------------------*/
2626 /* packRegsForAccUse - pack registers for acc use */
2627 /*-----------------------------------------------------------------*/
2629 packRegsForAccUse (iCode * ic)
2634 if (!canDefAccResult (ic))
2637 op = IC_RESULT (ic);
2639 /* has only one definition */
2640 if (bitVectnBitsOn (OP_DEFS (op)) > 1)
2643 /* has only one use */
2644 if (bitVectnBitsOn (OP_USES (op)) > 1)
2651 if (!canUseAccOperand (uic, op))
2655 if ((POINTER_GET(uic))
2656 || (ic->op == ADDRESS_OF && uic->op == '+' && IS_OP_LITERAL (IC_RIGHT (uic))))
2658 OP_SYMBOL (IC_RESULT (ic))->accuse = ACCUSE_HX;
2663 OP_SYMBOL (IC_RESULT (ic))->accuse = ACCUSE_XA;
2667 /*-----------------------------------------------------------------*/
2668 /* packForPush - hueristics to reduce iCode for pushing */
2669 /*-----------------------------------------------------------------*/
2671 packForPush (iCode * ic, eBBlock ** ebpp, int blockno)
2675 struct eBBlock * ebp=ebpp[blockno];
2677 if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
2680 /* must have only definition & one usage */
2681 if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
2682 bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
2685 /* find the definition */
2686 if (!(dic = hTabItemWithKey (iCodehTab,
2687 bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
2690 if (dic->op != '=' || POINTER_SET (dic))
2693 if (dic->seq < ebp->fSeq) { // Evelyn did this
2695 for (i=0; i<blockno; i++) {
2696 if (dic->seq >= ebpp[i]->fSeq && dic->seq <= ebpp[i]->lSeq) {
2701 wassert (i!=blockno); // no way to recover from here
2704 if (IS_SYMOP(IC_RIGHT(dic))) {
2705 /* make sure the right side does not have any definitions
2707 dbv = OP_DEFS(IC_RIGHT(dic));
2708 for (lic = ic; lic && lic != dic ; lic = lic->prev) {
2709 if (bitVectBitValue(dbv,lic->key))
2712 /* make sure they have the same type */
2713 if (IS_SPEC(operandType(IC_LEFT(ic))))
2715 sym_link *itype=operandType(IC_LEFT(ic));
2716 sym_link *ditype=operandType(IC_RIGHT(dic));
2718 if (SPEC_USIGN(itype)!=SPEC_USIGN(ditype) ||
2719 SPEC_LONG(itype)!=SPEC_LONG(ditype))
2722 /* extend the live range of replaced operand if needed */
2723 if (OP_SYMBOL(IC_RIGHT(dic))->liveTo < ic->seq) {
2724 OP_SYMBOL(IC_RIGHT(dic))->liveTo = ic->seq;
2726 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
2729 /* we now we know that it has one & only one def & use
2730 and the that the definition is an assignment */
2731 ReplaceOpWithCheaperOp(&IC_LEFT (ic), IC_RIGHT (dic));
2732 remiCodeFromeBBlock (ebp, dic);
2733 hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
2736 /*-----------------------------------------------------------------*/
2737 /* packRegisters - does some transformations to reduce register */
2739 /*-----------------------------------------------------------------*/
2741 packRegisters (eBBlock ** ebpp, int blockno)
2745 eBBlock *ebp=ebpp[blockno];
2752 /* look for assignments of the form */
2753 /* iTempNN = TRueSym (someoperation) SomeOperand */
2755 /* TrueSym := iTempNN:1 */
2756 for (ic = ebp->sch; ic; ic = ic->next)
2758 /* find assignment of the form TrueSym := iTempNN:1 */
2759 if (ic->op == '=' && !POINTER_SET (ic) )
2760 change += packRegsForAssign (ic, ebp);
2767 for (ic = ebp->sch; ic; ic = ic->next)
2769 //packRegsForLiteral (ic);
2771 /* if this is an itemp & result of an address of a true sym
2772 then mark this as rematerialisable */
2773 if (ic->op == ADDRESS_OF &&
2774 IS_ITEMP (IC_RESULT (ic)) &&
2775 IS_TRUE_SYMOP (IC_LEFT (ic)) &&
2776 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
2777 !OP_SYMBOL (IC_LEFT (ic))->onStack )
2780 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2781 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2782 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2786 if (ic->op == '=' &&
2787 !POINTER_SET (ic) &&
2788 IS_ITEMP (IC_RESULT (ic)) &&
2789 IS_VALOP (IC_RIGHT (ic)) &&
2790 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1)
2793 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2794 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2795 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2799 /* if straight assignment then carry remat flag if
2800 this is the only definition */
2801 if (ic->op == '=' &&
2802 !POINTER_SET (ic) &&
2803 IS_SYMOP (IC_RIGHT (ic)) &&
2804 OP_SYMBOL (IC_RIGHT (ic))->remat &&
2805 !IS_CAST_ICODE(OP_SYMBOL (IC_RIGHT (ic))->rematiCode) &&
2806 bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
2809 OP_SYMBOL (IC_RESULT (ic))->remat =
2810 OP_SYMBOL (IC_RIGHT (ic))->remat;
2811 OP_SYMBOL (IC_RESULT (ic))->rematiCode =
2812 OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
2815 /* if cast to a generic pointer & the pointer being
2816 cast is remat, then we can remat this cast as well */
2817 if (ic->op == CAST &&
2818 IS_SYMOP(IC_RIGHT(ic)) &&
2819 OP_SYMBOL(IC_RIGHT(ic))->remat &&
2820 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1) {
2821 sym_link *to_type = operandType(IC_LEFT(ic));
2822 sym_link *from_type = operandType(IC_RIGHT(ic));
2823 if (IS_GENPTR(to_type) && IS_PTR(from_type)) {
2824 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2825 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2826 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2830 /* if this is a +/- operation with a rematerizable
2831 then mark this as rematerializable as well */
2832 if ((ic->op == '+' || ic->op == '-') &&
2833 (IS_SYMOP (IC_LEFT (ic)) &&
2834 IS_ITEMP (IC_RESULT (ic)) &&
2835 IS_OP_LITERAL (IC_RIGHT (ic))) &&
2836 OP_SYMBOL (IC_LEFT (ic))->remat &&
2837 (!IS_SYMOP (IC_RIGHT (ic)) || !IS_CAST_ICODE(OP_SYMBOL (IC_RIGHT (ic))->rematiCode)) &&
2838 bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1)
2840 OP_SYMBOL (IC_RESULT (ic))->remat = 1;
2841 OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
2842 OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
2845 /* mark the pointer usages */
2846 if (POINTER_SET (ic))
2847 OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
2849 if (POINTER_GET (ic) &&
2850 IS_SYMOP(IC_LEFT (ic)))
2851 OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
2856 /* if we are using a symbol on the stack
2857 then we should say hc08_ptrRegReq */
2858 if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
2859 hc08_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
2860 OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
2861 else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
2862 hc08_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
2863 OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
2866 if (IS_SYMOP (IC_LEFT (ic)))
2867 hc08_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
2868 OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
2869 if (IS_SYMOP (IC_RIGHT (ic)))
2870 hc08_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
2871 OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
2872 if (IS_SYMOP (IC_RESULT (ic)))
2873 hc08_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
2874 OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
2879 /* if the condition of an if instruction
2880 is defined in the previous instruction and
2881 this is the only usage then
2882 mark the itemp as a conditional */
2883 if ((IS_CONDITIONAL (ic) ||
2884 (IS_BITWISE_OP(ic) && isBitwiseOptimizable (ic))) &&
2885 ic->next && ic->next->op == IFX &&
2886 bitVectnBitsOn (OP_USES(IC_RESULT(ic)))==1 &&
2887 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
2888 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
2890 OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
2895 /* if the condition of an if instruction
2896 is defined in the previous GET_POINTER instruction and
2897 this is the only usage then
2898 mark the itemp as accumulator use */
2899 if ((POINTER_GET (ic) && getSize (operandType (IC_RESULT (ic))) <=1) &&
2900 ic->next && ic->next->op == IFX &&
2901 bitVectnBitsOn (OP_USES(IC_RESULT(ic)))==1 &&
2902 isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
2903 OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
2905 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
2909 if (ic->op != IFX && ic->op !=JUMPTABLE && !POINTER_SET (ic)
2910 && IC_RESULT (ic) && IS_ITEMP (IC_RESULT (ic))
2911 && getSize (operandType (IC_RESULT (ic))) == 1
2912 && bitVectnBitsOn (OP_USES (IC_RESULT (ic))) == 1
2914 && OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
2918 if (ic->next->op == IFX)
2920 if (isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)))
2923 else if (ic->next->op == JUMPTABLE)
2925 if (isOperandEqual (IC_RESULT (ic), IC_JTCOND (ic->next)))
2930 if (isOperandEqual (IC_RESULT (ic), IC_LEFT (ic->next)))
2932 if (isOperandEqual (IC_RESULT (ic), IC_RIGHT (ic->next)))
2938 OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
2945 /* reduce for support function calls */
2946 if (ic->supportRtn || (ic->op != IFX && ic->op != JUMPTABLE))
2947 packRegsForSupport (ic, ebp);
2950 /* some cases the redundant moves can
2951 can be eliminated for return statements */
2952 if ((ic->op == RETURN || (ic->op == SEND && ic->argreg == 1)) &&
2953 /* !isOperandInFarSpace (IC_LEFT (ic)) && */
2954 options.model == MODEL_SMALL) {
2955 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
2958 /* if pointer set & left has a size more than
2959 one and right is not in far space */
2960 if (POINTER_SET (ic) &&
2961 /* !isOperandInFarSpace (IC_RIGHT (ic)) && */
2962 !OP_SYMBOL (IC_RESULT (ic))->remat &&
2963 !IS_OP_RUONLY (IC_RIGHT (ic))
2964 /* && getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1 */ )
2965 packRegsForOneuse (ic, IC_RESULT (ic), ebp);
2967 /* if pointer get */
2968 if (POINTER_GET (ic) &&
2969 IS_SYMOP (IC_LEFT (ic)) &&
2970 /* !isOperandInFarSpace (IC_RESULT (ic)) && */
2971 !OP_SYMBOL (IC_LEFT (ic))->remat &&
2972 !IS_OP_RUONLY (IC_RESULT (ic))
2973 /* && getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1 */)
2974 packRegsForOneuse (ic, IC_LEFT (ic), ebp);
2977 /* if this is cast for intergral promotion then
2978 check if only use of the definition of the
2979 operand being casted/ if yes then replace
2980 the result of that arithmetic operation with
2981 this result and get rid of the cast */
2984 sym_link *fromType = operandType (IC_RIGHT (ic));
2985 sym_link *toType = operandType (IC_LEFT (ic));
2987 if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
2988 getSize (fromType) != getSize (toType) &&
2989 SPEC_USIGN (fromType) == SPEC_USIGN (toType))
2992 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
2995 if (IS_ARITHMETIC_OP (dic))
2997 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
2998 ReplaceOpWithCheaperOp(&IC_RESULT (dic), IC_RESULT (ic));
2999 remiCodeFromeBBlock (ebp, ic);
3000 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3001 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3002 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3006 OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
3012 /* if the type from and type to are the same
3013 then if this is the only use then packit */
3014 if (compareType (operandType (IC_RIGHT (ic)),
3015 operandType (IC_LEFT (ic))) == 1)
3017 iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
3020 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
3021 ReplaceOpWithCheaperOp(&IC_RESULT (dic), IC_RESULT (ic));
3022 remiCodeFromeBBlock (ebp, ic);
3023 bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
3024 hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
3025 OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
3034 iTempNN := (some variable in farspace) V1
3039 if (ic->op == IPUSH)
3041 packForPush (ic, ebpp, blockno);
3044 packRegsForAccUse (ic);
3048 /*-----------------------------------------------------------------*/
3049 /* assignRegisters - assigns registers to each live range as need */
3050 /*-----------------------------------------------------------------*/
3052 hc08_assignRegisters (eBBlock ** ebbs, int count)
3057 setToNull ((void *) &_G.funcrUsed);
3058 setToNull ((void *) &_G.regAssigned);
3059 setToNull ((void *) &_G.totRegAssigned);
3060 hc08_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
3062 hc08_reg_a = hc08_regWithIdx(A_IDX);
3063 hc08_reg_x = hc08_regWithIdx(X_IDX);
3064 hc08_reg_h = hc08_regWithIdx(H_IDX);
3065 hc08_reg_hx = hc08_regWithIdx(HX_IDX);
3066 hc08_reg_xa = hc08_regWithIdx(XA_IDX);
3067 hc08_reg_sp = hc08_regWithIdx(SP_IDX);
3070 /* change assignments this will remove some
3071 live ranges reducing some register pressure */
3072 for (i = 0; i < count; i++)
3073 packRegisters (ebbs, i);
3075 /* liveranges probably changed by register packing
3076 so we compute them again */
3077 recomputeLiveRanges (ebbs, count);
3079 if (options.dump_pack)
3080 dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
3082 /* first determine for each live range the number of
3083 registers & the type of registers required for each */
3086 /* and serially allocate registers */
3087 serialRegAssign (ebbs, count);
3090 //setToNull ((void *) &_G.regAssigned);
3091 //setToNull ((void *) &_G.totRegAssigned);
3094 /* if stack was extended then tell the user */
3097 /* werror(W_TOOMANY_SPILS,"stack", */
3098 /* _G.stackExtend,currFunc->name,""); */
3104 /* werror(W_TOOMANY_SPILS,"data space", */
3105 /* _G.dataExtend,currFunc->name,""); */
3109 /* after that create the register mask
3110 for each of the instruction */
3111 createRegMask (ebbs, count);
3113 /* redo that offsets for stacked automatic variables */
3115 redoStackOffsets ();
3118 if (options.dump_rassgn)
3120 dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
3121 dumpLiveRanges (DUMP_LRANGE, liveRanges);
3124 /* do the overlaysegment stuff SDCCmem.c */
3125 doOverlays (ebbs, count);
3127 /* now get back the chain */
3128 ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
3132 /* free up any _G.stackSpil locations allocated */
3133 applyToSet (_G.stackSpil, deallocStackSpil);
3135 setToNull ((void **) &_G.stackSpil);
3136 setToNull ((void **) &_G.spiltSet);
3137 /* mark all registers as free */