/* some routines are non-processor specific & can be reused when */
/* targetting other processors. The decision for this will have */
/* to be made on a routine by routine basis */
-/* routines used to pack registers are most definitely not reusable*/
+/* routines used to pack registers are most definitely not reusable */
/* since the pack the registers depending strictly on the MCU */
/*-----------------------------------------------------------------*/
-extern void gen51Code(iCode *);
+extern void gen51Code (iCode *);
+#define D(x)
/* Global data */
-static struct {
+static struct
+ {
bitVect *spiltSet;
set *stackSpil;
bitVect *regAssigned;
+ bitVect *totRegAssigned; /* final set of LRs that got into registers */
short blockSpil;
int slocNum;
- bitVect *funcrUsed; /* registers used in a function */
+ bitVect *funcrUsed; /* registers used in a function */
int stackExtend;
int dataExtend;
-} _G;
+ }
+_G;
/* Shared with gen.c */
-int mcs51_ptrRegReq; /* one byte pointer register required */
+int mcs51_ptrRegReq; /* one byte pointer register required */
/* 8051 registers */
-regs regs8051[] =
+regs regs8051[] =
{
- { REG_GPR ,R2_IDX , REG_GPR , "r2", "ar2", "0", 2, 1 },
- { REG_GPR ,R3_IDX , REG_GPR , "r3", "ar3", "0", 3, 1 },
- { REG_GPR ,R4_IDX , REG_GPR , "r4", "ar4", "0", 4, 1 },
- { REG_GPR ,R5_IDX , REG_GPR , "r5", "ar5", "0", 5, 1 },
- { REG_GPR ,R6_IDX , REG_GPR , "r6", "ar6", "0", 6, 1 },
- { REG_GPR ,R7_IDX , REG_GPR , "r7", "ar7", "0", 7, 1 },
- { REG_PTR ,R0_IDX , REG_PTR , "r0" , "ar0", "0", 0, 1 },
- { REG_PTR ,R1_IDX , REG_PTR , "r1" , "ar1", "0", 1, 1 },
- { REG_GPR ,X8_IDX , REG_GPR , "x8", "x8" , "xreg", 0, 1 },
- { REG_GPR ,X9_IDX , REG_GPR , "x9", "x9" , "xreg", 1, 1 },
- { REG_GPR ,X10_IDX,REG_GPR , "x10", "x10", "xreg", 2, 1 },
- { REG_GPR ,X11_IDX,REG_GPR , "x11", "x11", "xreg", 3, 1 },
- { REG_GPR ,X12_IDX,REG_GPR , "x12", "x12", "xreg", 4, 1 },
- { REG_CND ,CND_IDX,REG_CND , "C" , "C" , "xreg", 0, 1 },
+ {REG_GPR, R2_IDX, REG_GPR, "r2", "ar2", "0", 2, 1},
+ {REG_GPR, R3_IDX, REG_GPR, "r3", "ar3", "0", 3, 1},
+ {REG_GPR, R4_IDX, REG_GPR, "r4", "ar4", "0", 4, 1},
+ {REG_GPR, R5_IDX, REG_GPR, "r5", "ar5", "0", 5, 1},
+ {REG_GPR, R6_IDX, REG_GPR, "r6", "ar6", "0", 6, 1},
+ {REG_GPR, R7_IDX, REG_GPR, "r7", "ar7", "0", 7, 1},
+ {REG_PTR, R0_IDX, REG_PTR, "r0", "ar0", "0", 0, 1},
+ {REG_PTR, R1_IDX, REG_PTR, "r1", "ar1", "0", 1, 1},
+ {REG_GPR, X8_IDX, REG_GPR, "x8", "x8", "xreg", 0, 1},
+ {REG_GPR, X9_IDX, REG_GPR, "x9", "x9", "xreg", 1, 1},
+ {REG_GPR, X10_IDX, REG_GPR, "x10", "x10", "xreg", 2, 1},
+ {REG_GPR, X11_IDX, REG_GPR, "x11", "x11", "xreg", 3, 1},
+ {REG_GPR, X12_IDX, REG_GPR, "x12", "x12", "xreg", 4, 1},
+ {REG_CND, CND_IDX, REG_CND, "C", "C", "xreg", 0, 1},
};
int mcs51_nRegs = 13;
static void spillThis (symbol *);
+static void freeAllRegs ();
/*-----------------------------------------------------------------*/
/* allocReg - allocates register of given type */
/*-----------------------------------------------------------------*/
-static regs *allocReg (short type)
+static regs *
+allocReg (short type)
{
- int i;
+ int i;
+
+ for (i = 0; i < mcs51_nRegs; i++)
+ {
- for ( i = 0 ; i < mcs51_nRegs ; i++ ) {
-
- /* if type is given as 0 then any
- free register will do */
- if (!type &&
- regs8051[i].isFree ) {
- regs8051[i].isFree = 0;
- if (currFunc)
- currFunc->regsUsed =
- bitVectSetBit(currFunc->regsUsed,i);
- return ®s8051[i];
+ /* if type is given as 0 then any
+ free register will do */
+ if (!type &&
+ regs8051[i].isFree)
+ {
+ regs8051[i].isFree = 0;
+ if (currFunc)
+ currFunc->regsUsed =
+ bitVectSetBit (currFunc->regsUsed, i);
+ return ®s8051[i];
}
- /* other wise look for specific type
- of register */
- if (regs8051[i].isFree &&
- regs8051[i].type == type) {
- regs8051[i].isFree = 0;
- if (currFunc)
- currFunc->regsUsed =
- bitVectSetBit(currFunc->regsUsed,i);
- return ®s8051[i];
+ /* other wise look for specific type
+ of register */
+ if (regs8051[i].isFree &&
+ regs8051[i].type == type)
+ {
+ regs8051[i].isFree = 0;
+ if (currFunc)
+ currFunc->regsUsed =
+ bitVectSetBit (currFunc->regsUsed, i);
+ return ®s8051[i];
}
}
- return NULL;
+ return NULL;
}
/*-----------------------------------------------------------------*/
/* mcs51_regWithIdx - returns pointer to register wit index number */
/*-----------------------------------------------------------------*/
-regs *mcs51_regWithIdx (int idx)
+regs *
+mcs51_regWithIdx (int idx)
{
- int i ;
-
- for (i=0;i < mcs51_nRegs;i++)
- if (regs8051[i].rIdx == idx)
- return ®s8051[i];
+ int i;
+
+ for (i = 0; i < mcs51_nRegs; i++)
+ if (regs8051[i].rIdx == idx)
+ return ®s8051[i];
- werror(E_INTERNAL_ERROR,__FILE__,__LINE__,
- "regWithIdx not found");
- exit(1);
+ werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
+ "regWithIdx not found");
+ exit (1);
}
/*-----------------------------------------------------------------*/
/* freeReg - frees a register */
/*-----------------------------------------------------------------*/
-static void freeReg (regs *reg)
+static void
+freeReg (regs * reg)
{
- reg->isFree = 1;
+ if (!reg)
+ {
+ werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
+ "freeReg - Freeing NULL register");
+ exit (1);
+ }
+
+ reg->isFree = 1;
}
/*-----------------------------------------------------------------*/
/* nFreeRegs - returns number of free registers */
/*-----------------------------------------------------------------*/
-static int nFreeRegs (int type)
+static int
+nFreeRegs (int type)
{
- int i;
- int nfr=0;
-
- for (i = 0 ; i < mcs51_nRegs; i++ )
- if (regs8051[i].isFree && regs8051[i].type == type)
- nfr++;
- return nfr;
+ int i;
+ int nfr = 0;
+
+ for (i = 0; i < mcs51_nRegs; i++)
+ if (regs8051[i].isFree && regs8051[i].type == type)
+ nfr++;
+ return nfr;
}
/*-----------------------------------------------------------------*/
/* nfreeRegsType - free registers with type */
/*-----------------------------------------------------------------*/
-static int nfreeRegsType (int type)
+static int
+nfreeRegsType (int type)
{
- int nfr ;
- if (type == REG_PTR) {
- if ((nfr = nFreeRegs(type)) == 0)
- return nFreeRegs(REG_GPR);
- }
-
- return nFreeRegs(type);
-}
+ int nfr;
+ if (type == REG_PTR)
+ {
+ if ((nfr = nFreeRegs (type)) == 0)
+ return nFreeRegs (REG_GPR);
+ }
+ return nFreeRegs (type);
+}
/*-----------------------------------------------------------------*/
-/* allDefsOutOfRange - all definitions are out of a range */
+/* useReg - marks a register as used */
/*-----------------------------------------------------------------*/
-static bool allDefsOutOfRange (bitVect *defs,int fseq, int toseq)
+static void
+useReg (regs * reg)
{
- int i ;
-
- if (!defs)
- return TRUE ;
-
- for ( i = 0 ;i < defs->size ; i++ ) {
- iCode *ic;
-
- if (bitVectBitValue(defs,i) &&
- (ic = hTabItemWithKey(iCodehTab,i)) &&
- ( ic->seq >= fseq && ic->seq <= toseq))
-
- return FALSE;
-
- }
-
- return TRUE;
+ reg->isFree = 0;
}
-
+
/*-----------------------------------------------------------------*/
/* computeSpillable - given a point find the spillable live ranges */
/*-----------------------------------------------------------------*/
-static bitVect *computeSpillable (iCode *ic)
+static bitVect *
+computeSpillable (iCode * ic)
{
- bitVect *spillable ;
-
- /* spillable live ranges are those that are live at this
- point . the following categories need to be subtracted
- from this set.
- a) - those that are already spilt
- b) - if being used by this one
- c) - defined by this one */
-
- spillable = bitVectCopy(ic->rlive);
- spillable =
- bitVectCplAnd(spillable,_G.spiltSet); /* those already spilt */
- spillable =
- bitVectCplAnd(spillable,ic->uses); /* used in this one */
- bitVectUnSetBit(spillable,ic->defKey);
- spillable = bitVectIntersect(spillable,_G.regAssigned);
- return spillable;
-
+ bitVect *spillable;
+
+ /* spillable live ranges are those that are live at this
+ point . the following categories need to be subtracted
+ from this set.
+ a) - those that are already spilt
+ b) - if being used by this one
+ c) - defined by this one */
+
+ spillable = bitVectCopy (ic->rlive);
+ spillable =
+ bitVectCplAnd (spillable, _G.spiltSet); /* those already spilt */
+ spillable =
+ bitVectCplAnd (spillable, ic->uses); /* used in this one */
+ bitVectUnSetBit (spillable, ic->defKey);
+ spillable = bitVectIntersect (spillable, _G.regAssigned);
+ return spillable;
+
}
/*-----------------------------------------------------------------*/
/* noSpilLoc - return true if a variable has no spil location */
/*-----------------------------------------------------------------*/
-static int noSpilLoc (symbol *sym, eBBlock *ebp,iCode *ic)
+static int
+noSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
{
- return (sym->usl.spillLoc ? 0 : 1);
+ return (sym->usl.spillLoc ? 0 : 1);
}
/*-----------------------------------------------------------------*/
/* hasSpilLoc - will return 1 if the symbol has spil location */
/*-----------------------------------------------------------------*/
-static int hasSpilLoc (symbol *sym, eBBlock *ebp, iCode *ic)
+static int
+hasSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
{
- return (sym->usl.spillLoc ? 1 : 0);
+ return (sym->usl.spillLoc ? 1 : 0);
}
/*-----------------------------------------------------------------*/
/* directSpilLoc - will return 1 if the splilocation is in direct */
/*-----------------------------------------------------------------*/
-static int directSpilLoc (symbol *sym, eBBlock *ebp, iCode *ic)
+static int
+directSpilLoc (symbol * sym, eBBlock * ebp, iCode * ic)
{
- if ( sym->usl.spillLoc &&
- (IN_DIRSPACE(SPEC_OCLS(sym->usl.spillLoc->etype))))
- return 1;
- else
- return 0;
+ if (sym->usl.spillLoc &&
+ (IN_DIRSPACE (SPEC_OCLS (sym->usl.spillLoc->etype))))
+ return 1;
+ else
+ return 0;
}
/*-----------------------------------------------------------------*/
-/* hasSpilLocnoUptr - will return 1 if the symbol has spil location*/
+/* hasSpilLocnoUptr - will return 1 if the symbol has spil location */
/* but is not used as a pointer */
/*-----------------------------------------------------------------*/
-static int hasSpilLocnoUptr (symbol *sym, eBBlock *ebp, iCode *ic)
+static int
+hasSpilLocnoUptr (symbol * sym, eBBlock * ebp, iCode * ic)
{
- return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
+ return ((sym->usl.spillLoc && !sym->uptr) ? 1 : 0);
}
/*-----------------------------------------------------------------*/
/* rematable - will return 1 if the remat flag is set */
/*-----------------------------------------------------------------*/
-static int rematable (symbol *sym, eBBlock *ebp, iCode *ic)
+static int
+rematable (symbol * sym, eBBlock * ebp, iCode * ic)
{
- return sym->remat;
-}
-
-/*-----------------------------------------------------------------*/
-/* notUsedInBlock - not used in this block */
-/*-----------------------------------------------------------------*/
-static int notUsedInBlock (symbol *sym, eBBlock *ebp, iCode *ic)
-{
- return (!bitVectBitsInCommon(sym->defs,ebp->usesDefs) &&
- allDefsOutOfRange (sym->defs,ebp->fSeq,ebp->lSeq));
-/* return (!bitVectBitsInCommon(sym->defs,ebp->usesDefs)); */
+ return sym->remat;
}
/*-----------------------------------------------------------------*/
/* notUsedInRemaining - not used or defined in remain of the block */
/*-----------------------------------------------------------------*/
-static int notUsedInRemaining (symbol *sym, eBBlock *ebp, iCode *ic)
+static int
+notUsedInRemaining (symbol * sym, eBBlock * ebp, iCode * ic)
{
- return ((usedInRemaining (operandFromSymbol(sym),ic) ? 0 : 1) &&
- allDefsOutOfRange (sym->defs,ebp->fSeq,ebp->lSeq));
+ return ((usedInRemaining (operandFromSymbol (sym), ic) ? 0 : 1) &&
+ allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
}
/*-----------------------------------------------------------------*/
/* allLRs - return true for all */
/*-----------------------------------------------------------------*/
-static int allLRs (symbol *sym, eBBlock *ebp, iCode *ic)
+static int
+allLRs (symbol * sym, eBBlock * ebp, iCode * ic)
{
- return 1;
+ return 1;
}
/*-----------------------------------------------------------------*/
/* liveRangesWith - applies function to a given set of live range */
/*-----------------------------------------------------------------*/
-static set *liveRangesWith (bitVect *lrs, int (func)(symbol *,eBBlock *, iCode *),
- eBBlock *ebp, iCode *ic)
+static set *
+liveRangesWith (bitVect * lrs, int (func) (symbol *, eBBlock *, iCode *),
+ eBBlock * ebp, iCode * ic)
{
- set *rset = NULL;
- int i;
-
- if (!lrs || !lrs->size)
- return NULL;
+ set *rset = NULL;
+ int i;
- for ( i = 1 ; i < lrs->size ; i++ ) {
- symbol *sym;
- if (!bitVectBitValue(lrs,i))
- continue ;
+ if (!lrs || !lrs->size)
+ return NULL;
- /* if we don't find it in the live range
- hash table we are in serious trouble */
- if (!(sym = hTabItemWithKey(liveRanges,i))) {
- werror(E_INTERNAL_ERROR,__FILE__,__LINE__,
- "liveRangesWith could not find liveRange");
- exit(1);
+ for (i = 1; i < lrs->size; i++)
+ {
+ symbol *sym;
+ if (!bitVectBitValue (lrs, i))
+ continue;
+
+ /* if we don't find it in the live range
+ hash table we are in serious trouble */
+ if (!(sym = hTabItemWithKey (liveRanges, i)))
+ {
+ werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
+ "liveRangesWith could not find liveRange");
+ exit (1);
}
-
- if (func(sym,ebp,ic) && bitVectBitValue(_G.regAssigned,sym->key))
- addSetHead(&rset,sym);
+
+ if (func (sym, ebp, ic) && bitVectBitValue (_G.regAssigned, sym->key))
+ addSetHead (&rset, sym);
}
- return rset;
+ return rset;
}
/*-----------------------------------------------------------------*/
/* leastUsedLR - given a set determines which is the least used */
/*-----------------------------------------------------------------*/
-static symbol *leastUsedLR (set *sset)
+static symbol *
+leastUsedLR (set * sset)
{
- symbol *sym = NULL, *lsym = NULL ;
-
- sym = lsym = setFirstItem(sset);
+ symbol *sym = NULL, *lsym = NULL;
- if (!lsym)
- return NULL;
+ sym = lsym = setFirstItem (sset);
+
+ if (!lsym)
+ return NULL;
- for (; lsym; lsym = setNextItem(sset)) {
-
- /* if usage is the same then prefer
- the spill the smaller of the two */
- if ( lsym->used == sym->used )
- if (getSize(lsym->type) < getSize(sym->type))
- sym = lsym;
-
- /* if less usage */
- if (lsym->used < sym->used )
- sym = lsym;
-
- }
-
- setToNull((void **)&sset);
- sym->blockSpil = 0;
- return sym;
+ for (; lsym; lsym = setNextItem (sset))
+ {
+
+ /* if usage is the same then prefer
+ the spill the smaller of the two */
+ if (lsym->used == sym->used)
+ if (getSize (lsym->type) < getSize (sym->type))
+ sym = lsym;
+
+ /* if less usage */
+ if (lsym->used < sym->used)
+ sym = lsym;
+
+ }
+
+ setToNull ((void **) &sset);
+ sym->blockSpil = 0;
+ return sym;
}
/*-----------------------------------------------------------------*/
/* noOverLap - will iterate through the list looking for over lap */
/*-----------------------------------------------------------------*/
-static int noOverLap (set *itmpStack, symbol *fsym)
+static int
+noOverLap (set * itmpStack, symbol * fsym)
{
- symbol *sym;
-
+ symbol *sym;
- for (sym = setFirstItem(itmpStack); sym;
- sym = setNextItem(itmpStack)) {
- if (sym->liveTo > fsym->liveFrom )
- return 0;
-
+
+ for (sym = setFirstItem (itmpStack); sym;
+ sym = setNextItem (itmpStack))
+ {
+ if (bitVectBitValue(sym->clashes,fsym->key)) return 0;
}
- return 1;
+ return 1;
}
/*-----------------------------------------------------------------*/
/* isFree - will return 1 if the a free spil location is found */
/*-----------------------------------------------------------------*/
-static DEFSETFUNC(isFree)
+static
+DEFSETFUNC (isFree)
{
- symbol *sym = item;
- V_ARG(symbol **,sloc);
- V_ARG(symbol *,fsym);
+ symbol *sym = item;
+ V_ARG (symbol **, sloc);
+ V_ARG (symbol *, fsym);
- /* if already found */
- if (*sloc)
- return 0;
+ /* if already found */
+ if (*sloc)
+ return 0;
- /* if it is free && and the itmp assigned to
- this does not have any overlapping live ranges
- with the one currently being assigned and
- the size can be accomodated */
- if (sym->isFree &&
- noOverLap(sym->usl.itmpStack,fsym) &&
- getSize(sym->type) >= getSize(fsym->type)) {
- *sloc = sym;
- return 1;
+ /* if it is free && and the itmp assigned to
+ this does not have any overlapping live ranges
+ with the one currently being assigned and
+ the size can be accomodated */
+ if (sym->isFree &&
+ noOverLap (sym->usl.itmpStack, fsym) &&
+ getSize (sym->type) >= getSize (fsym->type))
+ {
+ *sloc = sym;
+ return 1;
}
- return 0;
+ return 0;
}
/*-----------------------------------------------------------------*/
/* spillLRWithPtrReg :- will spil those live ranges which use PTR */
/*-----------------------------------------------------------------*/
-static void spillLRWithPtrReg (symbol *forSym)
+static void
+spillLRWithPtrReg (symbol * forSym)
{
- symbol *lrsym;
- regs *r0,*r1;
- int k;
-
- if (!_G.regAssigned ||
- bitVectIsZero(_G.regAssigned))
- return;
-
- r0 = mcs51_regWithIdx(R0_IDX);
- r1 = mcs51_regWithIdx(R1_IDX);
+ symbol *lrsym;
+ regs *r0, *r1;
+ int k;
- /* for all live ranges */
- for (lrsym = hTabFirstItem(liveRanges,&k) ; lrsym ;
- lrsym = hTabNextItem(liveRanges,&k) ) {
- int j;
-
- /* if no registers assigned to it or
- spilt */
- /* if it does not overlap with this then
- not need to spill it */
+ if (!_G.regAssigned ||
+ bitVectIsZero (_G.regAssigned))
+ return;
- if (lrsym->isspilt || !lrsym->nRegs ||
- (lrsym->liveTo < forSym->liveFrom))
- continue ;
+ r0 = mcs51_regWithIdx (R0_IDX);
+ r1 = mcs51_regWithIdx (R1_IDX);
- /* go thru the registers : if it is either
- r0 or r1 then spil it */
- for (j = 0 ; j < lrsym->nRegs ; j++ )
- if (lrsym->regs[j] == r0 ||
- lrsym->regs[j] == r1 ) {
- spillThis (lrsym);
- break;
- }
+ /* for all live ranges */
+ for (lrsym = hTabFirstItem (liveRanges, &k); lrsym;
+ lrsym = hTabNextItem (liveRanges, &k))
+ {
+ int j;
+
+ /* if no registers assigned to it or spilt */
+ /* if it does not overlap with this then
+ not need to spill it */
+
+ if (lrsym->isspilt || !lrsym->nRegs ||
+ (lrsym->liveTo < forSym->liveFrom))
+ continue;
+
+ /* go thru the registers : if it is either
+ r0 or r1 then spil it */
+ for (j = 0; j < lrsym->nRegs; j++)
+ if (lrsym->regs[j] == r0 ||
+ lrsym->regs[j] == r1)
+ {
+ spillThis (lrsym);
+ break;
+ }
}
}
/*-----------------------------------------------------------------*/
/* createStackSpil - create a location on the stack to spil */
/*-----------------------------------------------------------------*/
-static symbol *createStackSpil (symbol *sym)
+static symbol *
+createStackSpil (symbol * sym)
{
- symbol *sloc= NULL;
- int useXstack, model, noOverlay;
-
- char slocBuffer[30];
-
- /* first go try and find a free one that is already
- existing on the stack */
- if (applyToSet(_G.stackSpil,isFree,&sloc, sym)) {
- /* found a free one : just update & return */
- sym->usl.spillLoc = sloc;
- sym->stackSpil= 1;
- sloc->isFree = 0;
- addSetHead(&sloc->usl.itmpStack,sym);
- return sym;
- }
+ symbol *sloc = NULL;
+ int useXstack, model;
+
+ char slocBuffer[30];
- /* could not then have to create one , this is the hard part
- we need to allocate this on the stack : this is really a
- hack!! but cannot think of anything better at this time */
-
- if (sprintf(slocBuffer,"sloc%d",_G.slocNum++) >= sizeof(slocBuffer))
+ /* first go try and find a free one that is already
+ existing on the stack */
+ if (applyToSet (_G.stackSpil, isFree, &sloc, sym))
{
- fprintf(stderr, "***Internal error: slocBuffer overflowed: %s:%d\n",
- __FILE__, __LINE__);
- exit(1);
+ /* found a free one : just update & return */
+ sym->usl.spillLoc = sloc;
+ sym->stackSpil = 1;
+ sloc->isFree = 0;
+ addSetHead (&sloc->usl.itmpStack, sym);
+ return sym;
}
- sloc = newiTemp(slocBuffer);
+ /* could not then have to create one , this is the hard part
+ we need to allocate this on the stack : this is really a
+ hack!! but cannot think of anything better at this time */
- /* set the type to the spilling symbol */
- sloc->type = copyLinkChain(sym->type);
- sloc->etype = getSpec(sloc->type);
- SPEC_SCLS(sloc->etype) = S_DATA ;
- SPEC_EXTR(sloc->etype) = 0;
+ if (sprintf (slocBuffer, "sloc%d", _G.slocNum++) >= sizeof (slocBuffer))
+ {
+ fprintf (stderr, "***Internal error: slocBuffer overflowed: %s:%d\n",
+ __FILE__, __LINE__);
+ exit (1);
+ }
- /* we don't allow it to be allocated`
- onto the external stack since : so we
- temporarily turn it off ; we also
- turn off memory model to prevent
- the spil from going to the external storage
- */
-
- useXstack = options.useXstack;
- model = options.model;
+ sloc = newiTemp (slocBuffer);
+
+ /* set the type to the spilling symbol */
+ sloc->type = copyLinkChain (sym->type);
+ sloc->etype = getSpec (sloc->type);
+ SPEC_SCLS (sloc->etype) = S_DATA;
+ SPEC_EXTR (sloc->etype) = 0;
+ SPEC_STAT (sloc->etype) = 0;
+ SPEC_VOLATILE(sloc->etype) = 0;
+ SPEC_ABSA(sloc->etype) = 0;
+
+ /* we don't allow it to be allocated`
+ onto the external stack since : so we
+ temporarily turn it off ; we also
+ turn off memory model to prevent
+ the spil from going to the external storage
+ */
+
+ useXstack = options.useXstack;
+ model = options.model;
/* noOverlay = options.noOverlay; */
/* options.noOverlay = 1; */
- options.model = options.useXstack = 0;
+ options.model = options.useXstack = 0;
- allocLocal(sloc);
+ allocLocal (sloc);
- options.useXstack = useXstack;
- options.model = model;
+ options.useXstack = useXstack;
+ options.model = model;
/* options.noOverlay = noOverlay; */
- sloc->isref = 1; /* to prevent compiler warning */
-
- /* if it is on the stack then update the stack */
- if (IN_STACK(sloc->etype)) {
- currFunc->stack += getSize(sloc->type);
- _G.stackExtend += getSize(sloc->type);
- } else
- _G.dataExtend += getSize(sloc->type);
-
- /* add it to the _G.stackSpil set */
- addSetHead(&_G.stackSpil,sloc);
- sym->usl.spillLoc = sloc;
- sym->stackSpil = 1;
-
- /* add it to the set of itempStack set
- of the spill location */
- addSetHead(&sloc->usl.itmpStack,sym);
- return sym;
+ sloc->isref = 1; /* to prevent compiler warning */
+
+ /* if it is on the stack then update the stack */
+ if (IN_STACK (sloc->etype))
+ {
+ currFunc->stack += getSize (sloc->type);
+ _G.stackExtend += getSize (sloc->type);
+ }
+ else
+ _G.dataExtend += getSize (sloc->type);
+
+ /* add it to the _G.stackSpil set */
+ addSetHead (&_G.stackSpil, sloc);
+ sym->usl.spillLoc = sloc;
+ sym->stackSpil = 1;
+
+ /* add it to the set of itempStack set
+ of the spill location */
+ addSetHead (&sloc->usl.itmpStack, sym);
+ return sym;
}
/*-----------------------------------------------------------------*/
/* isSpiltOnStack - returns true if the spil location is on stack */
/*-----------------------------------------------------------------*/
-static bool isSpiltOnStack (symbol *sym)
+static bool
+isSpiltOnStack (symbol * sym)
{
- link *etype;
+ sym_link *etype;
- if (!sym)
- return FALSE ;
-
- if (!sym->isspilt)
- return FALSE ;
+ if (!sym)
+ return FALSE;
+
+ if (!sym->isspilt)
+ return FALSE;
/* if (sym->_G.stackSpil) */
-/* return TRUE; */
-
- if (!sym->usl.spillLoc)
- return FALSE;
+/* return TRUE; */
+
+ if (!sym->usl.spillLoc)
+ return FALSE;
- etype = getSpec(sym->usl.spillLoc->type);
- if (IN_STACK(etype))
- return TRUE;
+ etype = getSpec (sym->usl.spillLoc->type);
+ if (IN_STACK (etype))
+ return TRUE;
- return FALSE ;
+ return FALSE;
}
/*-----------------------------------------------------------------*/
/* spillThis - spils a specific operand */
/*-----------------------------------------------------------------*/
-static void spillThis (symbol *sym)
+static void
+spillThis (symbol * sym)
{
- int i;
- /* if this is rematerializable or has a spillLocation
- we are okay, else we need to create a spillLocation
- for it */
- if (!(sym->remat || sym->usl.spillLoc))
- createStackSpil (sym);
-
-
- /* mark it has spilt & put it in the spilt set */
- sym->isspilt = 1;
- _G.spiltSet = bitVectSetBit(_G.spiltSet,sym->key);
-
- bitVectUnSetBit(_G.regAssigned,sym->key);
-
- for (i = 0 ; i < sym->nRegs ; i++)
-
- if (sym->regs[i]) {
- freeReg(sym->regs[i]);
- sym->regs[i] = NULL;
- }
-
- /* if spilt on stack then free up r0 & r1
- if they could have been assigned to some
- LIVE ranges */
- if (!mcs51_ptrRegReq && isSpiltOnStack(sym)) {
- mcs51_ptrRegReq++ ;
- spillLRWithPtrReg(sym);
+ int i;
+ /* if this is rematerializable or has a spillLocation
+ we are okay, else we need to create a spillLocation
+ for it */
+ if (!(sym->remat || sym->usl.spillLoc))
+ createStackSpil (sym);
+
+ /* mark it has spilt & put it in the spilt set */
+ sym->isspilt = sym->spillA = 1;
+ _G.spiltSet = bitVectSetBit (_G.spiltSet, sym->key);
+
+ bitVectUnSetBit (_G.regAssigned, sym->key);
+ bitVectUnSetBit (_G.totRegAssigned, sym->key);
+
+ for (i = 0; i < sym->nRegs; i++)
+
+ if (sym->regs[i])
+ {
+ freeReg (sym->regs[i]);
+ sym->regs[i] = NULL;
+ }
+
+ /* if spilt on stack then free up r0 & r1
+ if they could have been assigned to some
+ LIVE ranges */
+ if (!mcs51_ptrRegReq && isSpiltOnStack (sym))
+ {
+ mcs51_ptrRegReq++;
+ spillLRWithPtrReg (sym);
}
- if (sym->usl.spillLoc && !sym->remat)
- sym->usl.spillLoc->allocreq = 1;
- return;
+ if (sym->usl.spillLoc && !sym->remat)
+ sym->usl.spillLoc->allocreq++;
+ return;
}
/*-----------------------------------------------------------------*/
/* selectSpil - select a iTemp to spil : rather a simple procedure */
/*-----------------------------------------------------------------*/
-static symbol *selectSpil (iCode *ic, eBBlock *ebp, symbol *forSym)
+static symbol *
+selectSpil (iCode * ic, eBBlock * ebp, symbol * forSym)
{
- bitVect *lrcs= NULL ;
- set *selectS ;
- symbol *sym;
+ bitVect *lrcs = NULL;
+ set *selectS;
+ symbol *sym;
- /* get the spillable live ranges */
- lrcs = computeSpillable (ic);
+ /* get the spillable live ranges */
+ lrcs = computeSpillable (ic);
- /* get all live ranges that are rematerizable */
- if ((selectS = liveRangesWith(lrcs,rematable,ebp,ic))) {
+ /* get all live ranges that are rematerizable */
+ if ((selectS = liveRangesWith (lrcs, rematable, ebp, ic)))
+ {
- /* return the least used of these */
- return leastUsedLR(selectS);
+ /* return the least used of these */
+ return leastUsedLR (selectS);
}
- /* get live ranges with spillLocations in direct space */
- if ((selectS = liveRangesWith(lrcs,directSpilLoc,ebp,ic))) {
- sym = leastUsedLR(selectS);
- strcpy(sym->rname,(sym->usl.spillLoc->rname[0] ?
- sym->usl.spillLoc->rname :
- sym->usl.spillLoc->name));
- sym->spildir = 1;
- /* mark it as allocation required */
- sym->usl.spillLoc->allocreq = 1;
- return sym;
+ /* get live ranges with spillLocations in direct space */
+ if ((selectS = liveRangesWith (lrcs, directSpilLoc, ebp, ic)))
+ {
+ sym = leastUsedLR (selectS);
+ strcpy (sym->rname, (sym->usl.spillLoc->rname[0] ?
+ sym->usl.spillLoc->rname :
+ sym->usl.spillLoc->name));
+ sym->spildir = 1;
+ /* mark it as allocation required */
+ sym->usl.spillLoc->allocreq++;
+ return sym;
}
- /* if the symbol is local to the block then */
- if (forSym->liveTo < ebp->lSeq) {
-
- /* check if there are any live ranges allocated
- to registers that are not used in this block */
- if (!_G.blockSpil && (selectS = liveRangesWith(lrcs,notUsedInBlock,ebp,ic))) {
- sym = leastUsedLR(selectS);
- /* if this is not rematerializable */
- if (!sym->remat) {
- _G.blockSpil++;
- sym->blockSpil = 1;
+ /* if the symbol is local to the block then */
+ if (forSym->liveTo < ebp->lSeq)
+ {
+
+ /* check if there are any live ranges allocated
+ to registers that are not used in this block */
+ if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInBlock, ebp, ic)))
+ {
+ sym = leastUsedLR (selectS);
+ /* if this is not rematerializable */
+ if (!sym->remat)
+ {
+ _G.blockSpil++;
+ sym->blockSpil = 1;
}
- return sym;
- }
-
- /* check if there are any live ranges that not
- used in the remainder of the block */
- if (!_G.blockSpil && (selectS = liveRangesWith(lrcs,notUsedInRemaining,ebp,ic))) {
- sym = leastUsedLR (selectS);
- if (sym != forSym) {
- if (!sym->remat) {
- sym->remainSpil = 1;
- _G.blockSpil++;
+ return sym;
+ }
+
+ /* check if there are any live ranges that not
+ used in the remainder of the block */
+ if (!_G.blockSpil && (selectS = liveRangesWith (lrcs, notUsedInRemaining, ebp, ic)))
+ {
+ sym = leastUsedLR (selectS);
+ if (sym != forSym)
+ {
+ if (!sym->remat)
+ {
+ sym->remainSpil = 1;
+ _G.blockSpil++;
}
- return sym;
+ return sym;
}
}
- }
-
- /* find live ranges with spillocation && not used as pointers */
- if ((selectS = liveRangesWith(lrcs,hasSpilLocnoUptr,ebp,ic))) {
-
- sym = leastUsedLR(selectS);
- /* mark this as allocation required */
- sym->usl.spillLoc->allocreq = 1;
- return sym;
}
- /* find live ranges with spillocation */
- if ((selectS = liveRangesWith(lrcs,hasSpilLoc,ebp,ic))) {
-
- sym = leastUsedLR(selectS);
- sym->usl.spillLoc->allocreq = 1;
- return sym;
+ /* find live ranges with spillocation && not used as pointers */
+ if ((selectS = liveRangesWith (lrcs, hasSpilLocnoUptr, ebp, ic)))
+ {
+
+ sym = leastUsedLR (selectS);
+ /* mark this as allocation required */
+ sym->usl.spillLoc->allocreq++;
+ return sym;
}
- /* couldn't find then we need to create a spil
- location on the stack , for which one? the least
- used ofcourse */
- if ((selectS = liveRangesWith(lrcs,noSpilLoc,ebp,ic))) {
-
- /* return a created spil location */
- sym = createStackSpil(leastUsedLR(selectS));
- sym->usl.spillLoc->allocreq = 1;
- return sym;
+ /* find live ranges with spillocation */
+ if ((selectS = liveRangesWith (lrcs, hasSpilLoc, ebp, ic)))
+ {
+
+ sym = leastUsedLR (selectS);
+ sym->usl.spillLoc->allocreq++;
+ return sym;
}
-
- /* this is an extreme situation we will spill
- this one : happens very rarely but it does happen */
- spillThis ( forSym );
- return forSym ;
-
+
+ /* couldn't find then we need to create a spil
+ location on the stack , for which one? the least
+ used ofcourse */
+ if ((selectS = liveRangesWith (lrcs, noSpilLoc, ebp, ic)))
+ {
+
+ /* return a created spil location */
+ sym = createStackSpil (leastUsedLR (selectS));
+ sym->usl.spillLoc->allocreq++;
+ return sym;
+ }
+
+ /* this is an extreme situation we will spill
+ this one : happens very rarely but it does happen */
+ spillThis (forSym);
+ return forSym;
+
}
/*-----------------------------------------------------------------*/
/* spilSomething - spil some variable & mark registers as free */
/*-----------------------------------------------------------------*/
-static bool spilSomething (iCode *ic, eBBlock *ebp, symbol *forSym)
+static bool
+spilSomething (iCode * ic, eBBlock * ebp, symbol * forSym)
{
- symbol *ssym;
- int i ;
+ symbol *ssym;
+ int i;
- /* get something we can spil */
- ssym = selectSpil(ic,ebp,forSym);
-
- /* mark it as spilt */
- ssym->isspilt = 1;
- _G.spiltSet = bitVectSetBit(_G.spiltSet,ssym->key);
-
- /* mark it as not register assigned &
- take it away from the set */
- bitVectUnSetBit(_G.regAssigned,ssym->key);
-
- /* mark the registers as free */
- for (i = 0 ; i < ssym->nRegs ;i++ )
- if (ssym->regs[i])
- freeReg(ssym->regs[i]);
-
- /* if spilt on stack then free up r0 & r1
- if they could have been assigned to as gprs */
- if (!mcs51_ptrRegReq && isSpiltOnStack(ssym) ) {
- mcs51_ptrRegReq++ ;
- spillLRWithPtrReg(ssym);
+ /* get something we can spil */
+ ssym = selectSpil (ic, ebp, forSym);
+
+ /* mark it as spilt */
+ ssym->isspilt = ssym->spillA = 1;
+ _G.spiltSet = bitVectSetBit (_G.spiltSet, ssym->key);
+
+ /* mark it as not register assigned &
+ take it away from the set */
+ bitVectUnSetBit (_G.regAssigned, ssym->key);
+ bitVectUnSetBit (_G.totRegAssigned, ssym->key);
+
+ /* mark the registers as free */
+ for (i = 0; i < ssym->nRegs; i++)
+ if (ssym->regs[i])
+ freeReg (ssym->regs[i]);
+
+ /* if spilt on stack then free up r0 & r1
+ if they could have been assigned to as gprs */
+ if (!mcs51_ptrRegReq && isSpiltOnStack (ssym))
+ {
+ mcs51_ptrRegReq++;
+ spillLRWithPtrReg (ssym);
}
- /* if this was a block level spil then insert push & pop
- at the start & end of block respectively */
- if (ssym->blockSpil) {
- iCode *nic = newiCode(IPUSH,operandFromSymbol(ssym),NULL);
- /* add push to the start of the block */
- addiCodeToeBBlock(ebp,nic,( ebp->sch->op == LABEL ?
+ /* if this was a block level spil then insert push & pop
+ at the start & end of block respectively */
+ if (ssym->blockSpil)
+ {
+ iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
+ /* add push to the start of the block */
+ addiCodeToeBBlock (ebp, nic, (ebp->sch->op == LABEL ?
ebp->sch->next : ebp->sch));
- nic = newiCode(IPOP,operandFromSymbol(ssym),NULL);
- /* add pop to the end of the block */
- addiCodeToeBBlock(ebp,nic,NULL);
- }
-
- /* if spilt because not used in the remainder of the
- block then add a push before this instruction and
- a pop at the end of the block */
- if (ssym->remainSpil) {
-
- iCode *nic = newiCode(IPUSH,operandFromSymbol(ssym),NULL);
- /* add push just before this instruction */
- addiCodeToeBBlock(ebp,nic,ic);
-
- nic = newiCode(IPOP,operandFromSymbol(ssym),NULL);
- /* add pop to the end of the block */
- addiCodeToeBBlock(ebp,nic,NULL);
+ nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
+ /* add pop to the end of the block */
+ addiCodeToeBBlock (ebp, nic, NULL);
+ }
+
+ /* if spilt because not used in the remainder of the
+ block then add a push before this instruction and
+ a pop at the end of the block */
+ if (ssym->remainSpil)
+ {
+
+ iCode *nic = newiCode (IPUSH, operandFromSymbol (ssym), NULL);
+ /* add push just before this instruction */
+ addiCodeToeBBlock (ebp, nic, ic);
+
+ nic = newiCode (IPOP, operandFromSymbol (ssym), NULL);
+ /* add pop to the end of the block */
+ addiCodeToeBBlock (ebp, nic, NULL);
}
- if (ssym == forSym )
- return FALSE ;
- else
- return TRUE ;
+ if (ssym == forSym)
+ return FALSE;
+ else
+ return TRUE;
}
/*-----------------------------------------------------------------*/
/* getRegPtr - will try for PTR if not a GPR type if not spil */
/*-----------------------------------------------------------------*/
-static regs *getRegPtr (iCode *ic, eBBlock *ebp, symbol *sym)
+static regs *
+getRegPtr (iCode * ic, eBBlock * ebp, symbol * sym)
{
- regs *reg;
+ regs *reg;
- tryAgain:
- /* try for a ptr type */
- if ((reg = allocReg(REG_PTR)))
- return reg;
+tryAgain:
+ /* try for a ptr type */
+ if ((reg = allocReg (REG_PTR)))
+ return reg;
- /* try for gpr type */
- if ((reg = allocReg(REG_GPR)))
- return reg;
+ /* try for gpr type */
+ if ((reg = allocReg (REG_GPR)))
+ return reg;
- /* we have to spil */
- if (!spilSomething (ic,ebp,sym))
- return NULL ;
+ /* we have to spil */
+ if (!spilSomething (ic, ebp, sym))
+ return NULL;
- /* this looks like an infinite loop but
- in really selectSpil will abort */
- goto tryAgain ;
+ /* this looks like an infinite loop but
+ in really selectSpil will abort */
+ goto tryAgain;
}
/*-----------------------------------------------------------------*/
/* getRegGpr - will try for GPR if not spil */
/*-----------------------------------------------------------------*/
-static regs *getRegGpr (iCode *ic, eBBlock *ebp,symbol *sym)
+static regs *
+getRegGpr (iCode * ic, eBBlock * ebp, symbol * sym)
+{
+ regs *reg;
+
+tryAgain:
+ /* try for gpr type */
+ if ((reg = allocReg (REG_GPR)))
+ return reg;
+
+ if (!mcs51_ptrRegReq)
+ if ((reg = allocReg (REG_PTR)))
+ return reg;
+
+ /* we have to spil */
+ if (!spilSomething (ic, ebp, sym))
+ return NULL;
+
+ /* this looks like an infinite loop but
+ in really selectSpil will abort */
+ goto tryAgain;
+}
+
+/*-----------------------------------------------------------------*/
+/* getRegPtrNoSpil - get it cannot split */
+/*-----------------------------------------------------------------*/
+static regs *getRegPtrNoSpil()
+{
+ regs *reg;
+
+ /* try for a ptr type */
+ if ((reg = allocReg (REG_PTR)))
+ return reg;
+
+ /* try for gpr type */
+ if ((reg = allocReg (REG_GPR)))
+ return reg;
+
+ assert(0);
+
+ /* just to make the compiler happy */
+ return 0;
+}
+
+/*-----------------------------------------------------------------*/
+/* getRegGprNoSpil - get it cannot split */
+/*-----------------------------------------------------------------*/
+static regs *getRegGprNoSpil()
{
- regs *reg;
-
- tryAgain:
- /* try for gpr type */
- if ((reg = allocReg(REG_GPR)))
- return reg;
-
- if (!mcs51_ptrRegReq)
- if ((reg = allocReg(REG_PTR)))
- return reg ;
-
- /* we have to spil */
- if (!spilSomething (ic,ebp,sym))
- return NULL ;
-
- /* this looks like an infinite loop but
- in really selectSpil will abort */
- goto tryAgain ;
+
+ regs *reg;
+ if ((reg = allocReg (REG_GPR)))
+ return reg;
+
+ if (!mcs51_ptrRegReq)
+ if ((reg = allocReg (REG_PTR)))
+ return reg;
+
+ assert(0);
+
+ /* just to make the compiler happy */
+ return 0;
}
/*-----------------------------------------------------------------*/
/* symHasReg - symbol has a given register */
/*-----------------------------------------------------------------*/
-static bool symHasReg(symbol *sym,regs *reg)
+static bool
+symHasReg (symbol * sym, regs * reg)
{
- int i;
+ int i;
- for ( i = 0 ; i < sym->nRegs ; i++)
- if (sym->regs[i] == reg)
- return TRUE;
-
- return FALSE;
+ for (i = 0; i < sym->nRegs; i++)
+ if (sym->regs[i] == reg)
+ return TRUE;
+
+ return FALSE;
}
/*-----------------------------------------------------------------*/
-/* deassignLRs - check the live to and if they have registers & are*/
+/* deassignLRs - check the live to and if they have registers & are */
/* not spilt then free up the registers */
/*-----------------------------------------------------------------*/
-static void deassignLRs (iCode *ic, eBBlock *ebp)
+static void
+deassignLRs (iCode * ic, eBBlock * ebp)
{
- symbol *sym;
- int k;
- symbol *result;
-
- for (sym = hTabFirstItem(liveRanges,&k); sym;
- sym = hTabNextItem(liveRanges,&k)) {
-
- symbol *psym= NULL;
- /* if it does not end here */
- if (sym->liveTo > ic->seq )
- continue ;
+ symbol *sym;
+ int k;
+ symbol *result;
+
+ for (sym = hTabFirstItem (liveRanges, &k); sym;
+ sym = hTabNextItem (liveRanges, &k))
+ {
- /* if it was spilt on stack then we can
- mark the stack spil location as free */
- if (sym->isspilt ) {
- if (sym->stackSpil) {
- sym->usl.spillLoc->isFree = 1;
- sym->stackSpil = 0;
+ symbol *psym = NULL;
+ /* if it does not end here */
+ if (sym->liveTo > ic->seq)
+ continue;
+
+ /* if it was spilt on stack then we can
+ mark the stack spil location as free */
+ if (sym->isspilt)
+ {
+ if (sym->stackSpil)
+ {
+ sym->usl.spillLoc->isFree = 1;
+ sym->stackSpil = 0;
}
- continue ;
+ continue;
}
-
- if (!bitVectBitValue(_G.regAssigned,sym->key))
- continue;
-
- /* special case check if this is an IFX &
- the privious one was a pop and the
- previous one was not spilt then keep track
- of the symbol */
- if (ic->op == IFX && ic->prev &&
- ic->prev->op == IPOP &&
- !ic->prev->parmPush &&
- !OP_SYMBOL(IC_LEFT(ic->prev))->isspilt)
- psym = OP_SYMBOL(IC_LEFT(ic->prev));
-
- if (sym->nRegs) {
- int i = 0;
-
- bitVectUnSetBit(_G.regAssigned,sym->key);
-
- /* if the result of this one needs registers
- and does not have it then assign it right
- away */
- if (IC_RESULT(ic) &&
- ! (SKIP_IC2(ic) || /* not a special icode */
- ic->op == JUMPTABLE ||
- ic->op == IFX ||
- ic->op == IPUSH ||
- ic->op == IPOP ||
- ic->op == RETURN ||
- POINTER_SET(ic)) &&
- (result = OP_SYMBOL(IC_RESULT(ic))) && /* has a result */
- result->liveTo > ic->seq && /* and will live beyond this */
- result->liveTo <= ebp->lSeq && /* does not go beyond this block */
- result->regType == sym->regType && /* same register types */
- result->nRegs && /* which needs registers */
- ! result->isspilt && /* and does not already have them */
- ! result->remat &&
- ! bitVectBitValue(_G.regAssigned,result->key) &&
- /* the number of free regs + number of regs in this LR
- can accomodate the what result Needs */
- ((nfreeRegsType(result->regType) +
- sym->nRegs) >= result->nRegs)
- ) {
-
- for (i = 0 ; i < result->nRegs ; i++)
- if (i < sym->nRegs )
- result->regs[i] = sym->regs[i] ;
- else
- result->regs[i] = getRegGpr (ic,ebp,result);
-
- _G.regAssigned = bitVectSetBit(_G.regAssigned,result->key);
-
- }
-
- /* free the remaining */
- for (; i < sym->nRegs ; i++) {
- if (psym) {
- if (!symHasReg(psym,sym->regs[i]))
- freeReg(sym->regs[i]);
- } else
- freeReg(sym->regs[i]);
+
+ if (!bitVectBitValue (_G.regAssigned, sym->key))
+ continue;
+
+ /* special case check if this is an IFX &
+ the privious one was a pop and the
+ previous one was not spilt then keep track
+ of the symbol */
+ if (ic->op == IFX && ic->prev &&
+ ic->prev->op == IPOP &&
+ !ic->prev->parmPush &&
+ !OP_SYMBOL (IC_LEFT (ic->prev))->isspilt)
+ psym = OP_SYMBOL (IC_LEFT (ic->prev));
+
+ if (sym->nRegs)
+ {
+ int i = 0;
+
+ bitVectUnSetBit (_G.regAssigned, sym->key);
+
+ /* if the result of this one needs registers
+ and does not have it then assign it right
+ away */
+ if (IC_RESULT (ic) &&
+ !(SKIP_IC2 (ic) || /* not a special icode */
+ ic->op == JUMPTABLE ||
+ ic->op == IFX ||
+ ic->op == IPUSH ||
+ ic->op == IPOP ||
+ ic->op == RETURN ||
+ POINTER_SET (ic)) &&
+ (result = OP_SYMBOL (IC_RESULT (ic))) && /* has a result */
+ result->liveTo > ic->seq && /* and will live beyond this */
+ result->liveTo <= ebp->lSeq && /* does not go beyond this block */
+ result->regType == sym->regType && /* same register types */
+ result->nRegs && /* which needs registers */
+ !result->isspilt && /* and does not already have them */
+ !result->remat &&
+ !bitVectBitValue (_G.regAssigned, result->key) &&
+ /* the number of free regs + number of regs in this LR
+ can accomodate the what result Needs */
+ ((nfreeRegsType (result->regType) +
+ sym->nRegs) >= result->nRegs)
+ )
+ {
+
+ for (i = 0; i < result->nRegs; i++)
+ if (i < sym->nRegs)
+ result->regs[i] = sym->regs[i];
+ else
+ result->regs[i] = getRegGpr (ic, ebp, result);
+
+ _G.regAssigned = bitVectSetBit (_G.regAssigned, result->key);
+ _G.totRegAssigned = bitVectSetBit (_G.totRegAssigned, result->key);
+
+ }
+
+ /* free the remaining */
+ for (; i < sym->nRegs; i++)
+ {
+ if (psym)
+ {
+ if (!symHasReg (psym, sym->regs[i]))
+ freeReg (sym->regs[i]);
+ }
+ else
+ freeReg (sym->regs[i]);
}
}
}
/*-----------------------------------------------------------------*/
/* reassignLR - reassign this to registers */
/*-----------------------------------------------------------------*/
-static void reassignLR (operand *op)
+static void
+reassignLR (operand * op)
{
- symbol *sym = OP_SYMBOL(op);
- int i;
+ symbol *sym = OP_SYMBOL (op);
+ int i;
- /* not spilt any more */
- sym->isspilt = sym->blockSpil = sym->remainSpil = 0;
- bitVectUnSetBit(_G.spiltSet,sym->key);
-
- _G.regAssigned = bitVectSetBit(_G.regAssigned,sym->key);
+ /* not spilt any more */
+ sym->isspilt = sym->spillA = sym->blockSpil = sym->remainSpil = 0;
+ bitVectUnSetBit (_G.spiltSet, sym->key);
- _G.blockSpil--;
+ _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
+ _G.totRegAssigned = bitVectSetBit (_G.totRegAssigned, sym->key);
- for (i=0;i<sym->nRegs;i++)
- sym->regs[i]->isFree = 0;
+ _G.blockSpil--;
+
+ for (i = 0; i < sym->nRegs; i++)
+ sym->regs[i]->isFree = 0;
}
/*-----------------------------------------------------------------*/
/* willCauseSpill - determines if allocating will cause a spill */
/*-----------------------------------------------------------------*/
-static int willCauseSpill ( int nr, int rt)
+static int
+willCauseSpill (int nr, int rt)
{
- /* first check if there are any avlb registers
- of te type required */
- if (rt == REG_PTR) {
- /* special case for pointer type
- if pointer type not avlb then
- check for type gpr */
- if (nFreeRegs(rt) >= nr)
+ /* first check if there are any avlb registers
+ of te type required */
+ if (rt == REG_PTR)
+ {
+ /* special case for pointer type
+ if pointer type not avlb then
+ check for type gpr */
+ if (nFreeRegs (rt) >= nr)
+ return 0;
+ if (nFreeRegs (REG_GPR) >= nr)
+ return 0;
+ }
+ else
+ {
+ if (mcs51_ptrRegReq)
+ {
+ if (nFreeRegs (rt) >= nr)
return 0;
- if (nFreeRegs(REG_GPR) >= nr)
+ }
+ else
+ {
+ if (nFreeRegs (REG_PTR) +
+ nFreeRegs (REG_GPR) >= nr)
return 0;
- } else {
- if (mcs51_ptrRegReq) {
- if (nFreeRegs(rt) >= nr)
- return 0;
- } else {
- if (nFreeRegs(REG_PTR) +
- nFreeRegs(REG_GPR) >= nr)
- return 0;
}
}
- /* it will cause a spil */
- return 1;
+ /* it will cause a spil */
+ return 1;
}
/*-----------------------------------------------------------------*/
-/* positionRegs - the allocator can allocate same registers to res-*/
+/* positionRegs - the allocator can allocate same registers to res- */
/* ult and operand, if this happens make sure they are in the same */
/* position as the operand otherwise chaos results */
/*-----------------------------------------------------------------*/
-static void positionRegs (symbol *result, symbol *opsym, int lineno)
+static int
+positionRegs (symbol * result, symbol * opsym)
{
- int count = min(result->nRegs,opsym->nRegs);
- int i , j = 0, shared = 0;
-
- /* if the result has been spilt then cannot share */
- if (opsym->isspilt)
- return ;
- again:
- shared = 0;
- /* first make sure that they actually share */
- for ( i = 0 ; i < count; i++ ) {
- for (j = 0 ; j < count ; j++ ) {
- if (result->regs[i] == opsym->regs[j] && i !=j) {
- shared = 1;
- goto xchgPositions;
- }
- }
- }
- xchgPositions:
- if (shared) {
- regs *tmp = result->regs[i];
- result->regs[i] = result->regs[j];
- result->regs[j] = tmp;
- goto again;
+ int count = min (result->nRegs, opsym->nRegs);
+ int i, j = 0, shared = 0;
+ int change = 0;
+
+ /* if the result has been spilt then cannot share */
+ if (opsym->isspilt)
+ return 0;
+again:
+ shared = 0;
+ /* first make sure that they actually share */
+ for (i = 0; i < count; i++)
+ {
+ for (j = 0; j < count; j++)
+ {
+ if (result->regs[i] == opsym->regs[j] && i != j)
+ {
+ shared = 1;
+ goto xchgPositions;
+ }
}
+ }
+xchgPositions:
+ if (shared)
+ {
+ regs *tmp = result->regs[i];
+ result->regs[i] = result->regs[j];
+ result->regs[j] = tmp;
+ change ++;
+ goto again;
+ }
+ return change;
}
/*-----------------------------------------------------------------*/
/* serialRegAssign - serially allocate registers to the variables */
/*-----------------------------------------------------------------*/
-static void serialRegAssign (eBBlock **ebbs, int count)
+static void
+serialRegAssign (eBBlock ** ebbs, int count)
{
int i;
/* for all blocks */
- for (i = 0; i < count ; i++ ) {
-
+ for (i = 0; i < count; i++) {
+
iCode *ic;
-
+
if (ebbs[i]->noPath &&
(ebbs[i]->entryLabel != entryLabel &&
- ebbs[i]->entryLabel != returnLabel ))
- continue ;
+ ebbs[i]->entryLabel != returnLabel))
+ continue;
/* of all instructions do */
- for (ic = ebbs[i]->sch ; ic ; ic = ic->next) {
-
+ for (ic = ebbs[i]->sch; ic; ic = ic->next) {
+#if 0
+ int i;
+
+ // update the registers in use at the start of this icode
+ for (i=0; i<8; i++) {
+ if (regs8051[i].isFree) {
+ ic->riu &= ~(1<<regs8051[i].offset);
+ } else {
+ ic->riu |= (1<<regs8051[i].offset);
+ }
+ }
+#endif
+
/* if this is an ipop that means some live
range will have to be assigned again */
if (ic->op == IPOP)
- reassignLR (IC_LEFT(ic));
+ reassignLR (IC_LEFT (ic));
/* if result is present && is a true symbol */
- if (IC_RESULT(ic) && ic->op != IFX &&
- IS_TRUE_SYMOP(IC_RESULT(ic)))
- OP_SYMBOL(IC_RESULT(ic))->allocreq = 1;
+ if (IC_RESULT (ic) && ic->op != IFX &&
+ IS_TRUE_SYMOP (IC_RESULT (ic)))
+ OP_SYMBOL (IC_RESULT (ic))->allocreq++;
/* take away registers from live
- ranges that end at this instruction */
- deassignLRs (ic, ebbs[i]) ;
-
+ ranges that end at this instruction */
+ deassignLRs (ic, ebbs[i]);
+
/* some don't need registers */
- if (SKIP_IC2(ic) ||
+ if (SKIP_IC2 (ic) ||
ic->op == JUMPTABLE ||
ic->op == IFX ||
ic->op == IPUSH ||
ic->op == IPOP ||
- (IC_RESULT(ic) &&POINTER_SET(ic)) )
- continue;
-
+ (IC_RESULT (ic) && POINTER_SET (ic)))
+ continue;
+
/* now we need to allocate registers
only for the result */
- if (IC_RESULT(ic)) {
- symbol *sym = OP_SYMBOL(IC_RESULT(ic));
+ if (IC_RESULT (ic)) {
+ symbol *sym = OP_SYMBOL (IC_RESULT (ic));
bitVect *spillable;
- int willCS ;
+ int willCS;
int j;
int ptrRegSet = 0;
-
+
/* if it does not need or is spilt
or is already assigned to registers
or will not live beyond this instructions */
- if (!sym->nRegs ||
- sym->isspilt ||
- bitVectBitValue(_G.regAssigned,sym->key) ||
+ if (!sym->nRegs ||
+ sym->isspilt ||
+ bitVectBitValue (_G.regAssigned, sym->key) ||
sym->liveTo <= ic->seq)
- continue ;
+ continue;
/* if some liverange has been spilt at the block level
and this one live beyond this block then spil this
to be safe */
if (_G.blockSpil && sym->liveTo > ebbs[i]->lSeq) {
spillThis (sym);
- continue ;
+ continue;
}
/* if trying to allocate this will cause
a spill and there is nothing to spill
or this one is rematerializable then
spill this one */
- willCS = willCauseSpill(sym->nRegs,sym->regType);
- spillable = computeSpillable(ic);
- if ( sym->remat ||
- (willCS && bitVectIsZero(spillable) ) ) {
-
- spillThis (sym) ;
- continue ;
-
+ willCS = willCauseSpill (sym->nRegs, sym->regType);
+ spillable = computeSpillable (ic);
+ if (sym->remat || (willCS && bitVectIsZero (spillable))) {
+ spillThis (sym);
+ continue;
}
/* if it has a spillocation & is used less than
all other live ranges then spill this */
- if ( willCS && sym->usl.spillLoc ) {
-
- symbol *leastUsed =
- leastUsedLR(liveRangesWith (spillable ,
- allLRs,
- ebbs[i],
- ic));
- if (leastUsed &&
- leastUsed->used > sym->used) {
- spillThis (sym);
- continue;
+ if (willCS) {
+ if (sym->usl.spillLoc) {
+ symbol *leastUsed = leastUsedLR (liveRangesWith (spillable,
+ allLRs, ebbs[i], ic));
+ if (leastUsed && leastUsed->used > sym->used) {
+ spillThis (sym);
+ continue;
+ }
+ } else {
+ /* if none of the liveRanges have a spillLocation then better
+ to spill this one than anything else already assigned to registers */
+ if (liveRangesWith(spillable,noSpilLoc,ebbs[i],ic)) {
+ /* if this is local to this block then we might find a block spil */
+ if (!(sym->liveFrom >= ebbs[i]->fSeq && sym->liveTo <= ebbs[i]->lSeq)) {
+ spillThis (sym);
+ continue;
+ }
+ }
}
- }
-
+ }
/* if we need ptr regs for the right side
then mark it */
- if (POINTER_GET(ic) && IS_SYMOP(IC_LEFT(ic))
- && getSize(OP_SYMBOL(IC_LEFT(ic))->type)
- <= PTRSIZE)
- {
+ if (POINTER_GET (ic) && IS_SYMOP (IC_LEFT (ic))
+ && getSize (OP_SYMBOL (IC_LEFT (ic))->type) <= (unsigned int) PTRSIZE) {
mcs51_ptrRegReq++;
ptrRegSet = 1;
}
- /* else we assign registers to it */
- _G.regAssigned = bitVectSetBit(_G.regAssigned,sym->key);
+ /* else we assign registers to it */
+ _G.regAssigned = bitVectSetBit (_G.regAssigned, sym->key);
+ _G.totRegAssigned = bitVectSetBit (_G.totRegAssigned, sym->key);
- for (j = 0 ; j < sym->nRegs ;j++ ) {
+ for (j = 0; j < sym->nRegs; j++) {
if (sym->regType == REG_PTR)
- sym->regs[j] = getRegPtr(ic,ebbs[i],sym);
+ sym->regs[j] = getRegPtr (ic, ebbs[i], sym);
else
- sym->regs[j] = getRegGpr(ic,ebbs[i],sym);
+ sym->regs[j] = getRegGpr (ic, ebbs[i], sym);
- /* if the allocation falied which means
+ /* if the allocation failed which means
this was spilt then break */
- if (!sym->regs[j])
- break;
+ if (!sym->regs[j]) {
+ break;
+ }
}
+
/* if it shares registers with operands make sure
that they are in the same position */
- if (IC_LEFT(ic) && IS_SYMOP(IC_LEFT(ic)) &&
- OP_SYMBOL(IC_LEFT(ic))->nRegs && ic->op != '=')
- positionRegs(OP_SYMBOL(IC_RESULT(ic)),
- OP_SYMBOL(IC_LEFT(ic)),ic->lineno);
+ if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)) &&
+ OP_SYMBOL (IC_LEFT (ic))->nRegs && ic->op != '=') {
+ positionRegs (OP_SYMBOL (IC_RESULT (ic)),
+ OP_SYMBOL (IC_LEFT (ic)));
+ }
/* do the same for the right operand */
- if (IC_RIGHT(ic) && IS_SYMOP(IC_RIGHT(ic)) &&
- OP_SYMBOL(IC_RIGHT(ic))->nRegs)
- positionRegs(OP_SYMBOL(IC_RESULT(ic)),
- OP_SYMBOL(IC_RIGHT(ic)),ic->lineno);
-
+ if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)) &&
+ OP_SYMBOL (IC_RIGHT (ic))->nRegs) {
+ positionRegs (OP_SYMBOL (IC_RESULT (ic)),
+ OP_SYMBOL (IC_RIGHT (ic)));
+ }
+
if (ptrRegSet) {
mcs51_ptrRegReq--;
ptrRegSet = 0;
}
-
- }
+
+ }
}
}
}
/*-----------------------------------------------------------------*/
-/* rUmaskForOp :- returns register mask for an operand */
+/* fillGaps - Try to fill in the Gaps left by Pass1 */
/*-----------------------------------------------------------------*/
-static bitVect *rUmaskForOp (operand *op)
+static void fillGaps()
{
- bitVect *rumask;
- symbol *sym;
- int j;
+ symbol *sym =NULL;
+ int key =0;
- /* only temporaries are assigned registers */
- if (!IS_ITEMP(op))
- return NULL;
-
- sym = OP_SYMBOL(op);
+ if (getenv("DISABLE_FILL_GAPS")) return;
- /* if spilt or no registers assigned to it
- then nothing */
- if (sym->isspilt || !sym->nRegs)
- return NULL;
-
- rumask = newBitVect(mcs51_nRegs);
-
- for (j = 0; j < sym->nRegs; j++) {
- rumask = bitVectSetBit(rumask,
- sym->regs[j]->rIdx);
- }
+ /* look for livernages that was spilt by the allocator */
+ for (sym = hTabFirstItem(liveRanges,&key) ; sym ;
+ sym = hTabNextItem(liveRanges,&key)) {
- return rumask;
-}
+ int i;
+ int pdone = 0;
-/*-----------------------------------------------------------------*/
-/* regsUsedIniCode :- returns bit vector of registers used in iCode*/
-/*-----------------------------------------------------------------*/
-static bitVect *regsUsedIniCode (iCode *ic)
-{
- bitVect *rmask = newBitVect(mcs51_nRegs);
+ if (!sym->spillA || !sym->clashes || sym->remat) continue ;
- /* do the special cases first */
- if (ic->op == IFX ) {
- rmask = bitVectUnion(rmask,
- rUmaskForOp(IC_COND(ic)));
- goto ret;
- }
+ /* find the liveRanges this one clashes with, that are
+ still assigned to registers & mark the registers as used*/
+ for ( i = 0 ; i < sym->clashes->size ; i ++) {
+ int k;
+ symbol *clr;
- /* for the jumptable */
- if (ic->op == JUMPTABLE) {
- rmask = bitVectUnion(rmask,
- rUmaskForOp(IC_JTCOND(ic)));
+ if (bitVectBitValue(sym->clashes,i) == 0 || /* those that clash with this */
+ bitVectBitValue(_G.totRegAssigned,i) == 0) /* and are still assigned to registers */
+ continue ;
- goto ret;
- }
+ clr = hTabItemWithKey(liveRanges,i);
+ assert(clr);
+
+ /* mark these registers as used */
+ for (k = 0 ; k < clr->nRegs ; k++ )
+ useReg(clr->regs[k]);
+ }
- /* of all other cases */
- if (IC_LEFT(ic))
- rmask = bitVectUnion(rmask,
- rUmaskForOp(IC_LEFT(ic)));
-
-
- if (IC_RIGHT(ic))
- rmask = bitVectUnion(rmask,
- rUmaskForOp(IC_RIGHT(ic)));
+ if (willCauseSpill(sym->nRegs,sym->regType)) {
+ /* NOPE :( clear all registers & and continue */
+ freeAllRegs();
+ continue ;
+ }
- if (IC_RESULT(ic))
- rmask = bitVectUnion(rmask,
- rUmaskForOp(IC_RESULT(ic)));
+ /* THERE IS HOPE !!!! */
+ for (i=0; i < sym->nRegs ; i++ ) {
+ if (sym->regType == REG_PTR)
+ sym->regs[i] = getRegPtrNoSpil ();
+ else
+ sym->regs[i] = getRegGprNoSpil ();
+ }
- ret:
- return rmask;
+ /* for all its definitions check if the registers
+ allocated needs positioning NOTE: we can position
+ only ONCE if more than One positioning required
+ then give up */
+ sym->isspilt = 0;
+ for (i = 0 ; i < sym->defs->size ; i++ ) {
+ if (bitVectBitValue(sym->defs,i)) {
+ iCode *ic;
+ if (!(ic = hTabItemWithKey(iCodehTab,i))) continue ;
+ if (SKIP_IC(ic)) continue;
+ assert(isSymbolEqual(sym,OP_SYMBOL(IC_RESULT(ic)))); /* just making sure */
+ /* if left is assigned to registers */
+ if (IS_SYMOP(IC_LEFT(ic)) &&
+ bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(IC_LEFT(ic))->key)) {
+ pdone += positionRegs(sym,OP_SYMBOL(IC_LEFT(ic)));
+ }
+ if (IS_SYMOP(IC_RIGHT(ic)) &&
+ bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(IC_RIGHT(ic))->key)) {
+ pdone += positionRegs(sym,OP_SYMBOL(IC_RIGHT(ic)));
+ }
+ if (pdone > 1) break;
+ }
+ }
+ for (i = 0 ; i < sym->uses->size ; i++ ) {
+ if (bitVectBitValue(sym->uses,i)) {
+ iCode *ic;
+ if (!(ic = hTabItemWithKey(iCodehTab,i))) continue ;
+ if (SKIP_IC(ic)) continue;
+ if (!IS_ASSIGN_ICODE(ic)) continue ;
+
+ /* if result is assigned to registers */
+ if (IS_SYMOP(IC_RESULT(ic)) &&
+ bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(IC_RESULT(ic))->key)) {
+ pdone += positionRegs(sym,OP_SYMBOL(IC_RESULT(ic)));
+ }
+ if (pdone > 1) break;
+ }
+ }
+ /* had to position more than once GIVE UP */
+ if (pdone > 1) {
+ /* UNDO all the changes we made to try this */
+ sym->isspilt = 1;
+ for (i=0; i < sym->nRegs ; i++ ) {
+ sym->regs[i] = NULL;
+ }
+ freeAllRegs();
+ D(printf ("Fill Gap gave up due to positioning for %s in function %s\n",sym->name, currFunc ? currFunc->name : "UNKNOWN"));
+ continue ;
+ }
+ D(printf ("FILLED GAP for %s in function %s\n",sym->name, currFunc ? currFunc->name : "UNKNOWN"));
+ _G.totRegAssigned = bitVectSetBit(_G.totRegAssigned,sym->key);
+ sym->isspilt = sym->spillA = 0 ;
+ sym->usl.spillLoc->allocreq--;
+ freeAllRegs();
+ }
}
/*-----------------------------------------------------------------*/
-/* createRegMask - for each instruction will determine the regsUsed*/
+/* rUmaskForOp :- returns register mask for an operand */
/*-----------------------------------------------------------------*/
-static void createRegMask (eBBlock **ebbs, int count)
+bitVect *
+mcs51_rUmaskForOp (operand * op)
{
- int i;
+ bitVect *rumask;
+ symbol *sym;
+ int j;
- /* for all blocks */
- for (i = 0; i < count ; i++ ) {
- iCode *ic ;
+ /* only temporaries are assigned registers */
+ if (!IS_ITEMP (op))
+ return NULL;
- if ( ebbs[i]->noPath &&
- ( ebbs[i]->entryLabel != entryLabel &&
- ebbs[i]->entryLabel != returnLabel ))
- continue ;
+ sym = OP_SYMBOL (op);
+
+ /* if spilt or no registers assigned to it
+ then nothing */
+ if (sym->isspilt || !sym->nRegs)
+ return NULL;
- /* for all instructions */
- for ( ic = ebbs[i]->sch ; ic ; ic = ic->next ) {
-
- int j;
+ rumask = newBitVect (mcs51_nRegs);
- if (SKIP_IC2(ic) || !ic->rlive)
- continue ;
-
- /* first mark the registers used in this
- instruction */
- ic->rUsed = regsUsedIniCode(ic);
- _G.funcrUsed = bitVectUnion(_G.funcrUsed,ic->rUsed);
-
- /* now create the register mask for those
- registers that are in use : this is a
- super set of ic->rUsed */
- ic->rMask = newBitVect(mcs51_nRegs+1);
-
- /* for all live Ranges alive at this point */
- for (j = 1; j < ic->rlive->size; j++ ) {
- symbol *sym;
- int k;
-
- /* if not alive then continue */
- if (!bitVectBitValue(ic->rlive,j))
- continue ;
-
- /* find the live range we are interested in */
- if (!(sym = hTabItemWithKey(liveRanges,j))) {
- werror (E_INTERNAL_ERROR,__FILE__,__LINE__,
- "createRegMask cannot find live range");
- exit(0);
+ for (j = 0; j < sym->nRegs; j++)
+ {
+ rumask = bitVectSetBit (rumask,
+ sym->regs[j]->rIdx);
+ }
+
+ return rumask;
+}
+
+/*-----------------------------------------------------------------*/
+/* regsUsedIniCode :- returns bit vector of registers used in iCode */
+/*-----------------------------------------------------------------*/
+static bitVect *
+regsUsedIniCode (iCode * ic)
+{
+ bitVect *rmask = newBitVect (mcs51_nRegs);
+
+ /* do the special cases first */
+ if (ic->op == IFX)
+ {
+ rmask = bitVectUnion (rmask,
+ mcs51_rUmaskForOp (IC_COND (ic)));
+ goto ret;
+ }
+
+ /* for the jumptable */
+ if (ic->op == JUMPTABLE)
+ {
+ rmask = bitVectUnion (rmask,
+ mcs51_rUmaskForOp (IC_JTCOND (ic)));
+
+ goto ret;
+ }
+
+ /* of all other cases */
+ if (IC_LEFT (ic))
+ rmask = bitVectUnion (rmask,
+ mcs51_rUmaskForOp (IC_LEFT (ic)));
+
+
+ if (IC_RIGHT (ic))
+ rmask = bitVectUnion (rmask,
+ mcs51_rUmaskForOp (IC_RIGHT (ic)));
+
+ if (IC_RESULT (ic))
+ rmask = bitVectUnion (rmask,
+ mcs51_rUmaskForOp (IC_RESULT (ic)));
+
+ret:
+ return rmask;
+}
+
+/*-----------------------------------------------------------------*/
+/* createRegMask - for each instruction will determine the regsUsed */
+/*-----------------------------------------------------------------*/
+static void
+createRegMask (eBBlock ** ebbs, int count)
+{
+ int i;
+
+ /* for all blocks */
+ for (i = 0; i < count; i++)
+ {
+ iCode *ic;
+
+ if (ebbs[i]->noPath &&
+ (ebbs[i]->entryLabel != entryLabel &&
+ ebbs[i]->entryLabel != returnLabel))
+ continue;
+
+ /* for all instructions */
+ for (ic = ebbs[i]->sch; ic; ic = ic->next)
+ {
+
+ int j;
+
+ if (SKIP_IC2 (ic) || !ic->rlive)
+ continue;
+
+ /* first mark the registers used in this
+ instruction */
+ ic->rUsed = regsUsedIniCode (ic);
+ _G.funcrUsed = bitVectUnion (_G.funcrUsed, ic->rUsed);
+
+ /* now create the register mask for those
+ registers that are in use : this is a
+ super set of ic->rUsed */
+ ic->rMask = newBitVect (mcs51_nRegs + 1);
+
+ /* for all live Ranges alive at this point */
+ for (j = 1; j < ic->rlive->size; j++)
+ {
+ symbol *sym;
+ int k;
+
+ /* if not alive then continue */
+ if (!bitVectBitValue (ic->rlive, j))
+ continue;
+
+ /* find the live range we are interested in */
+ if (!(sym = hTabItemWithKey (liveRanges, j)))
+ {
+ werror (E_INTERNAL_ERROR, __FILE__, __LINE__,
+ "createRegMask cannot find live range");
+ fprintf(stderr, "\tmissing live range: key=%d\n", j);
+ exit (0);
}
- /* if no register assigned to it */
- if (!sym->nRegs || sym->isspilt)
- continue ;
+ /* if no register assigned to it */
+ if (!sym->nRegs || sym->isspilt)
+ continue;
- /* for all the registers allocated to it */
- for (k = 0 ; k < sym->nRegs ;k++)
- if (sym->regs[k])
- ic->rMask =
- bitVectSetBit(ic->rMask,sym->regs[k]->rIdx);
+ /* for all the registers allocated to it */
+ for (k = 0; k < sym->nRegs; k++)
+ if (sym->regs[k])
+ ic->rMask =
+ bitVectSetBit (ic->rMask, sym->regs[k]->rIdx);
}
}
}
/*-----------------------------------------------------------------*/
/* rematStr - returns the rematerialized string for a remat var */
/*-----------------------------------------------------------------*/
-static char *rematStr (symbol *sym)
+static char *
+rematStr (symbol * sym)
{
- char *s = buffer;
- iCode *ic = sym->rematiCode;
-
- while (1) {
-
- /* if plus or minus print the right hand side */
- if (ic->op == '+' || ic->op == '-') {
- sprintf(s,"0x%04x %c ",(int) operandLitValue(IC_RIGHT(ic)),
- ic->op );
- s += strlen(s);
- ic = OP_SYMBOL(IC_LEFT(ic))->rematiCode;
- continue ;
- }
-
- /* we reached the end */
- sprintf(s,"%s",OP_SYMBOL(IC_LEFT(ic))->rname);
- break;
+ char *s = buffer;
+ iCode *ic = sym->rematiCode;
+
+ while (1)
+ {
+
+ /* if plus or minus print the right hand side */
+ if (ic->op == '+' || ic->op == '-')
+ {
+ sprintf (s, "0x%04x %c ", (int) operandLitValue (IC_RIGHT (ic)),
+ ic->op);
+ s += strlen (s);
+ ic = OP_SYMBOL (IC_LEFT (ic))->rematiCode;
+ continue;
+ }
+
+ /* cast then continue */
+ if (IS_CAST_ICODE(ic)) {
+ ic = OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
+ continue;
+ }
+ /* we reached the end */
+ sprintf (s, "%s", OP_SYMBOL (IC_LEFT (ic))->rname);
+ break;
}
- return buffer ;
+ return buffer;
}
/*-----------------------------------------------------------------*/
/* regTypeNum - computes the type & number of registers required */
/*-----------------------------------------------------------------*/
-static void regTypeNum ()
+static void
+regTypeNum (eBBlock *ebbs)
{
- symbol *sym;
- int k;
- iCode *ic;
+ symbol *sym;
+ int k;
+ iCode *ic;
- /* for each live range do */
- for ( sym = hTabFirstItem(liveRanges,&k); sym ;
- sym = hTabNextItem(liveRanges,&k)) {
+ /* for each live range do */
+ for (sym = hTabFirstItem (liveRanges, &k); sym;
+ sym = hTabNextItem (liveRanges, &k))
+ {
- /* if used zero times then no registers needed */
- if ((sym->liveTo - sym->liveFrom) == 0)
- continue ;
+ /* if used zero times then no registers needed */
+ if ((sym->liveTo - sym->liveFrom) == 0)
+ continue;
- /* if the live range is a temporary */
- if (sym->isitmp) {
+ /* if the live range is a temporary */
+ if (sym->isitmp)
+ {
- /* if the type is marked as a conditional */
- if (sym->regType == REG_CND)
- continue ;
+ /* if the type is marked as a conditional */
+ if (sym->regType == REG_CND)
+ continue;
- /* if used in return only then we don't
- need registers */
- if (sym->ruonly || sym->accuse) {
- if (IS_AGGREGATE(sym->type) || sym->isptr)
- sym->type = aggrToPtr(sym->type,FALSE);
- continue ;
+ /* if used in return only then we don't
+ need registers */
+ if (sym->ruonly || sym->accuse)
+ {
+ if (IS_AGGREGATE (sym->type) || sym->isptr)
+ sym->type = aggrToPtr (sym->type, FALSE);
+ continue;
}
-
- /* if the symbol has only one definition &
- that definition is a get_pointer and the
- pointer we are getting is rematerializable and
- in "data" space */
-
- if (bitVectnBitsOn(sym->defs) == 1 &&
- (ic = hTabItemWithKey(iCodehTab,
- bitVectFirstBit(sym->defs))) &&
- POINTER_GET(ic) &&
- !IS_BITVAR(sym->etype)) {
-
-
- /* if remat in data space */
- if (OP_SYMBOL(IC_LEFT(ic))->remat &&
- DCL_TYPE(aggrToPtr(sym->type,FALSE)) == POINTER) {
-
- /* create a psuedo symbol & force a spil */
- symbol *psym = newSymbol(rematStr(OP_SYMBOL(IC_LEFT(ic))),1);
- psym->type = sym->type;
- psym->etype = sym->etype;
- strcpy(psym->rname,psym->name);
- sym->isspilt = 1;
- sym->usl.spillLoc = psym;
- continue ;
+
+#ifdef RANGEHUNT
+ /* if this symbol has only one usage and that is an assignment
+ to a ruonly, we don't need registers */
+ // if this symbol has only one def
+ if (bitVectnBitsOn (sym->defs)==1) {
+ printf ("sym: %s has only one usage", sym->name);
+ // find that usage
+ if ((ic = hTabItemWithKey (iCodehTab, bitVectFirstBit (sym->defs)))) {
+ if (ic->op==CALL) {
+ printf (" for a call ");
+ // if this is only assigned to a ruonly
+ if ((ic = hTabItemWithKey (iCodehTab, bitVectFirstBit (sym->defs)))) {
+ if (ic->op=='=') {
+ if (OP_SYMBOL(IC_RESULT(ic))->ruonly) {
+ printf("regTypeNum: %s assigned to %s\n", \
+ sym->name, OP_SYMBOL(IC_RESULT(ic))->name);
+ }
+ }
+ }
+ }
+ }
+ }
+#endif
+
+ /* if the symbol has only one definition &
+ that definition is a get_pointer */
+ if (bitVectnBitsOn (sym->defs) == 1 &&
+ (ic = hTabItemWithKey (iCodehTab,
+ bitVectFirstBit (sym->defs))) &&
+ POINTER_GET (ic) &&
+ !sym->noSpilLoc &&
+ !IS_BITVAR (sym->etype))
+ {
+
+
+ /* and that pointer is remat in data space */
+ if (IS_SYMOP (IC_LEFT (ic)) &&
+ OP_SYMBOL (IC_LEFT (ic))->remat &&
+ !IS_CAST_ICODE(OP_SYMBOL (IC_LEFT (ic))->rematiCode) &&
+ DCL_TYPE (aggrToPtr (operandType(IC_LEFT(ic)), FALSE)) == POINTER)
+ {
+ /* create a psuedo symbol & force a spil */
+ symbol *psym = newSymbol (rematStr (OP_SYMBOL (IC_LEFT (ic))), 1);
+ psym->type = sym->type;
+ psym->etype = sym->etype;
+ strcpy (psym->rname, psym->name);
+ sym->isspilt = 1;
+ sym->usl.spillLoc = psym;
+#if 0 // an alternative fix for bug #480076
+ /* now this is a useless assignment to itself */
+ remiCodeFromeBBlock (ebbs, ic);
+#else
+ /* now this really is an assignment to itself, make it so;
+ it will be optimized out later */
+ ic->op='=';
+ ReplaceOpWithCheaperOp(&IC_RIGHT(ic), IC_RESULT(ic));
+ IC_LEFT(ic)=NULL;
+#endif
+ continue;
}
- /* if in data space or idata space then try to
- allocate pointer register */
-
+ /* if in data space or idata space then try to
+ allocate pointer register */
+
}
-
- /* if not then we require registers */
- sym->nRegs = ((IS_AGGREGATE(sym->type) || sym->isptr ) ?
- getSize(sym->type = aggrToPtr(sym->type,FALSE)) :
- getSize(sym->type));
-
- if (sym->nRegs > 4) {
- fprintf(stderr,"allocated more than 4 or 0 registers for type ");
- printTypeChain(sym->type,stderr);fprintf(stderr,"\n");
- }
-
- /* determine the type of register required */
- if (sym->nRegs == 1 &&
- IS_PTR(sym->type) &&
- sym->uptr)
- sym->regType = REG_PTR ;
- else
- sym->regType = REG_GPR ;
-
- } else
- /* for the first run we don't provide */
- /* registers for true symbols we will */
- /* see how things go */
- sym->nRegs = 0 ;
- }
-
+
+ /* if not then we require registers */
+ sym->nRegs = ((IS_AGGREGATE (sym->type) || sym->isptr) ?
+ getSize (sym->type = aggrToPtr (sym->type, FALSE)) :
+ getSize (sym->type));
+
+ if (sym->nRegs > 4)
+ {
+ fprintf (stderr, "allocated more than 4 or 0 registers for type ");
+ printTypeChain (sym->type, stderr);
+ fprintf (stderr, "\n");
+ }
+
+ /* determine the type of register required */
+ if (sym->nRegs == 1 &&
+ IS_PTR (sym->type) &&
+ sym->uptr)
+ sym->regType = REG_PTR;
+ else
+ sym->regType = REG_GPR;
+
+ }
+ else
+ /* for the first run we don't provide */
+ /* registers for true symbols we will */
+ /* see how things go */
+ sym->nRegs = 0;
+ }
+
}
/*-----------------------------------------------------------------*/
/* freeAllRegs - mark all registers as free */
/*-----------------------------------------------------------------*/
-static void freeAllRegs()
+static void
+freeAllRegs ()
{
- int i;
+ int i;
- for (i=0;i< mcs51_nRegs;i++ )
- regs8051[i].isFree = 1;
+ for (i = 0; i < mcs51_nRegs; i++)
+ regs8051[i].isFree = 1;
}
/*-----------------------------------------------------------------*/
/* deallocStackSpil - this will set the stack pointer back */
/*-----------------------------------------------------------------*/
-static DEFSETFUNC(deallocStackSpil)
+static
+DEFSETFUNC (deallocStackSpil)
{
- symbol *sym = item;
+ symbol *sym = item;
- deallocLocal(sym);
- return 0;
+ deallocLocal (sym);
+ return 0;
}
/*-----------------------------------------------------------------*/
/* farSpacePackable - returns the packable icode for far variables */
/*-----------------------------------------------------------------*/
-static iCode *farSpacePackable (iCode *ic)
+static iCode *
+farSpacePackable (iCode * ic)
{
- iCode *dic ;
-
- /* go thru till we find a definition for the
- symbol on the right */
- for ( dic = ic->prev ; dic ; dic = dic->prev) {
-
- /* if the definition is a call then no */
- if ((dic->op == CALL || dic->op == PCALL) &&
- IC_RESULT(dic)->key == IC_RIGHT(ic)->key) {
- return NULL;
+ iCode *dic;
+
+ /* go thru till we find a definition for the
+ symbol on the right */
+ for (dic = ic->prev; dic; dic = dic->prev)
+ {
+ /* if the definition is a call then no */
+ if ((dic->op == CALL || dic->op == PCALL) &&
+ IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
+ {
+ return NULL;
}
-
- /* if shift by unknown amount then not */
- if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
- IC_RESULT(dic)->key == IC_RIGHT(ic)->key)
- return NULL;
- /* if pointer get and size > 1 */
- if (POINTER_GET(dic) &&
- getSize(aggrToPtr(operandType(IC_LEFT(dic)),FALSE)) > 1)
- return NULL ;
+ /* if shift by unknown amount then not */
+ if ((dic->op == LEFT_OP || dic->op == RIGHT_OP) &&
+ IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
+ return NULL;
+
+ /* if pointer get and size > 1 */
+ if (POINTER_GET (dic) &&
+ getSize (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)) > 1)
+ return NULL;
- if (POINTER_SET(dic) &&
- getSize(aggrToPtr(operandType(IC_RESULT(dic)),FALSE)) > 1)
- return NULL ;
+ if (POINTER_SET (dic) &&
+ getSize (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)) > 1)
+ return NULL;
- /* if any three is a true symbol in far space */
- if (IC_RESULT(dic) &&
- IS_TRUE_SYMOP(IC_RESULT(dic)) &&
- isOperandInFarSpace(IC_RESULT(dic)))
- return NULL;
+ /* if any three is a true symbol in far space */
+ if (IC_RESULT (dic) &&
+ IS_TRUE_SYMOP (IC_RESULT (dic)) &&
+ isOperandInFarSpace (IC_RESULT (dic)))
+ return NULL;
- if (IC_RIGHT(dic) &&
- IS_TRUE_SYMOP(IC_RIGHT(dic)) &&
- isOperandInFarSpace(IC_RIGHT(dic)) &&
- !isOperandEqual(IC_RIGHT(dic),IC_RESULT(ic)))
- return NULL;
+ if (IC_RIGHT (dic) &&
+ IS_TRUE_SYMOP (IC_RIGHT (dic)) &&
+ isOperandInFarSpace (IC_RIGHT (dic)) &&
+ !isOperandEqual (IC_RIGHT (dic), IC_RESULT (ic)))
+ return NULL;
+
+ if (IC_LEFT (dic) &&
+ IS_TRUE_SYMOP (IC_LEFT (dic)) &&
+ isOperandInFarSpace (IC_LEFT (dic)) &&
+ !isOperandEqual (IC_LEFT (dic), IC_RESULT (ic)))
+ return NULL;
- if (IC_LEFT(dic) &&
- IS_TRUE_SYMOP(IC_LEFT(dic)) &&
- isOperandInFarSpace(IC_LEFT(dic)) &&
- !isOperandEqual(IC_LEFT(dic),IC_RESULT(ic)))
+ if (isOperandEqual (IC_RIGHT (ic), IC_RESULT (dic)))
+ {
+ if ((dic->op == LEFT_OP ||
+ dic->op == RIGHT_OP ||
+ dic->op == '-') &&
+ IS_OP_LITERAL (IC_RIGHT (dic)))
return NULL;
-
- if (isOperandEqual(IC_RIGHT(ic),IC_RESULT(dic))) {
- if ( (dic->op == LEFT_OP ||
- dic->op == RIGHT_OP ||
- dic->op == '-') &&
- IS_OP_LITERAL(IC_RIGHT(dic)))
- return NULL;
- else
- return dic;
+ else
+ return dic;
}
}
- return NULL;
+ return NULL;
}
/*-----------------------------------------------------------------*/
/* packRegsForAssign - register reduction for assignment */
/*-----------------------------------------------------------------*/
-static int packRegsForAssign (iCode *ic,eBBlock *ebp)
+static int
+packRegsForAssign (iCode * ic, eBBlock * ebp)
{
- iCode *dic, *sic;
- link *etype = operandType(IC_RIGHT(ic));
-
- if (!IS_ITEMP(IC_RIGHT(ic)) ||
- OP_SYMBOL(IC_RIGHT(ic))->isind ||
- OP_LIVETO(IC_RIGHT(ic)) > ic->seq ||
- IS_BITFIELD(etype)) {
- return 0;
- }
-
- /* if the true symbol is defined in far space or on stack
- then we should not since this will increase register pressure */
- if (isOperandInFarSpace(IC_RESULT(ic))) {
- if ((dic = farSpacePackable(ic)))
- goto pack;
- else
- return 0;
-
+ iCode *dic, *sic;
+
+ if (!IS_ITEMP (IC_RIGHT (ic)) ||
+ OP_SYMBOL (IC_RIGHT (ic))->isind ||
+ OP_LIVETO (IC_RIGHT (ic)) > ic->seq)
+ {
+ return 0;
}
- /* find the definition of iTempNN scanning backwards if we find a
- a use of the true symbol in before we find the definition then
- we cannot */
- for ( dic = ic->prev ; dic ; dic = dic->prev) {
-
- /* if there is a function call and this is
- a parameter & not my parameter then don't pack it */
- if ( (dic->op == CALL || dic->op == PCALL) &&
- (OP_SYMBOL(IC_RESULT(ic))->_isparm &&
- !OP_SYMBOL(IC_RESULT(ic))->ismyparm)) {
- dic = NULL;
- break;
- }
- if (SKIP_IC2(dic))
- continue;
- if (IS_TRUE_SYMOP(IC_RESULT(dic)) &&
- IS_OP_VOLATILE(IC_RESULT(dic))) {
- dic = NULL;
- break;
+ /* if the true symbol is defined in far space or on stack
+ then we should not since this will increase register pressure */
+ if (isOperandInFarSpace(IC_RESULT(ic)) && !farSpacePackable(ic)) {
+ return 0;
+ }
+
+ /* find the definition of iTempNN scanning backwards if we find a
+ a use of the true symbol in before we find the definition then
+ we cannot */
+ for (dic = ic->prev; dic; dic = dic->prev)
+ {
+ /* if there is a function call then don't pack it */
+ if ((dic->op == CALL || dic->op == PCALL))
+ {
+ dic = NULL;
+ break;
}
- if (IS_SYMOP(IC_RESULT(dic)) &&
- IC_RESULT(dic)->key == IC_RIGHT(ic)->key) {
- if (POINTER_SET(dic))
- dic = NULL;
+ if (SKIP_IC2 (dic))
+ continue;
- break;
+ if (IS_TRUE_SYMOP (IC_RESULT (dic)) &&
+ IS_OP_VOLATILE (IC_RESULT (dic)))
+ {
+ dic = NULL;
+ break;
}
- if (IS_SYMOP(IC_RIGHT(dic)) &&
- (IC_RIGHT(dic)->key == IC_RESULT(ic)->key ||
- IC_RIGHT(dic)->key == IC_RIGHT(ic)->key)) {
+ if (IS_SYMOP (IC_RESULT (dic)) &&
+ IC_RESULT (dic)->key == IC_RIGHT (ic)->key)
+ {
+ if (POINTER_SET (dic))
dic = NULL;
- break;
+
+ break;
}
-
- if (IS_SYMOP(IC_LEFT(dic)) &&
- (IC_LEFT(dic)->key == IC_RESULT(ic)->key ||
- IC_LEFT(dic)->key == IC_RIGHT(ic)->key)) {
- dic = NULL;
- break;
+
+ if (IS_SYMOP (IC_RIGHT (dic)) &&
+ (IC_RIGHT (dic)->key == IC_RESULT (ic)->key ||
+ IC_RIGHT (dic)->key == IC_RIGHT (ic)->key))
+ {
+ dic = NULL;
+ break;
}
- if (POINTER_SET(dic) &&
- IC_RESULT(dic)->key == IC_RESULT(ic)->key ) {
- dic = NULL ;
- break;
+ if (IS_SYMOP (IC_LEFT (dic)) &&
+ (IC_LEFT (dic)->key == IC_RESULT (ic)->key ||
+ IC_LEFT (dic)->key == IC_RIGHT (ic)->key))
+ {
+ dic = NULL;
+ break;
+ }
+
+ if (POINTER_SET (dic) &&
+ IC_RESULT (dic)->key == IC_RESULT (ic)->key)
+ {
+ dic = NULL;
+ break;
}
}
-
- if (!dic)
- return 0 ; /* did not find */
-
- /* if assignment then check that right is not a bit */
- if (ASSIGNMENT(dic) && !POINTER_SET(dic)) {
- link *etype = operandType(IC_RIGHT(dic));
- if (IS_BITFIELD(etype)) return 0;
+
+ if (!dic)
+ return 0; /* did not find */
+
+ /* if assignment then check that right is not a bit */
+ if (ASSIGNMENT (dic) && !POINTER_SET (dic))
+ {
+ sym_link *etype = operandType (IC_RIGHT (dic));
+ if (IS_BITFIELD (etype))
+ {
+ /* if result is a bit too then it's ok */
+ etype = operandType (IC_RESULT (dic));
+ if (!IS_BITFIELD (etype))
+ return 0;
+ }
+ }
+ /* if the result is on stack or iaccess then it must be
+ the same atleast one of the operands */
+ if (OP_SYMBOL (IC_RESULT (ic))->onStack ||
+ OP_SYMBOL (IC_RESULT (ic))->iaccess)
+ {
+
+ /* the operation has only one symbol
+ operator then we can pack */
+ if ((IC_LEFT (dic) && !IS_SYMOP (IC_LEFT (dic))) ||
+ (IC_RIGHT (dic) && !IS_SYMOP (IC_RIGHT (dic))))
+ goto pack;
+
+ if (!((IC_LEFT (dic) &&
+ IC_RESULT (ic)->key == IC_LEFT (dic)->key) ||
+ (IC_RIGHT (dic) &&
+ IC_RESULT (ic)->key == IC_RIGHT (dic)->key)))
+ return 0;
}
- /* if the result is on stack or iaccess then it must be
- the same atleast one of the operands */
- if (OP_SYMBOL(IC_RESULT(ic))->onStack ||
- OP_SYMBOL(IC_RESULT(ic))->iaccess ) {
-
- /* the operation has only one symbol
- operator then we can pack */
- if ((IC_LEFT(dic) && !IS_SYMOP(IC_LEFT(dic))) ||
- (IC_RIGHT(dic) && !IS_SYMOP(IC_RIGHT(dic))))
- goto pack;
-
- if (!((IC_LEFT(dic) &&
- IC_RESULT(ic)->key == IC_LEFT(dic)->key) ||
- (IC_RIGHT(dic) &&
- IC_RESULT(ic)->key == IC_RIGHT(dic)->key)))
- return 0;
- }
pack:
- /* found the definition */
- /* replace the result with the result of */
- /* this assignment and remove this assignment */
- IC_RESULT(dic) = IC_RESULT(ic) ;
+ /* found the definition */
+ /* replace the result with the result of */
+ /* this assignment and remove this assignment */
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
+ ReplaceOpWithCheaperOp(&IC_RESULT (dic), IC_RESULT (ic));
- if (IS_ITEMP(IC_RESULT(dic)) && OP_SYMBOL(IC_RESULT(dic))->liveFrom > dic->seq) {
- OP_SYMBOL(IC_RESULT(dic))->liveFrom = dic->seq;
+ if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
+ {
+ OP_SYMBOL (IC_RESULT (dic))->liveFrom = dic->seq;
}
- /* delete from liverange table also
- delete from all the points inbetween and the new
- one */
- for ( sic = dic; sic != ic ; sic = sic->next ) {
- bitVectUnSetBit(sic->rlive,IC_RESULT(ic)->key);
- if (IS_ITEMP(IC_RESULT(dic)))
- bitVectSetBit(sic->rlive,IC_RESULT(dic)->key);
+ // TODO: and the otherway around?
+
+ /* delete from liverange table also
+ delete from all the points inbetween and the new
+ one */
+ for (sic = dic; sic != ic; sic = sic->next)
+ {
+ bitVectUnSetBit (sic->rlive, IC_RESULT (ic)->key);
+ if (IS_ITEMP (IC_RESULT (dic)))
+ bitVectSetBit (sic->rlive, IC_RESULT (dic)->key);
}
-
- remiCodeFromeBBlock(ebp,ic);
- hTabDeleteItem (&iCodehTab,ic->key,ic,DELETE_ITEM,NULL);
- OP_DEFS(IC_RESULT(dic)) = bitVectSetBit(OP_DEFS(IC_RESULT(dic)),dic->key);
- return 1;
-
+
+ remiCodeFromeBBlock (ebp, ic);
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
+ hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
+ OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
+ return 1;
}
-/*-----------------------------------------------------------------*/
-/* findAssignToSym : scanning backwards looks for first assig found*/
-/*-----------------------------------------------------------------*/
-static iCode *findAssignToSym (operand *op,iCode *ic)
+/*------------------------------------------------------------------*/
+/* findAssignToSym : scanning backwards looks for first assig found */
+/*------------------------------------------------------------------*/
+static iCode *
+findAssignToSym (operand * op, iCode * ic)
{
- iCode *dic;
-
- for (dic = ic->prev ; dic ; dic = dic->prev) {
-
- /* if definition by assignment */
- if (dic->op == '=' &&
- !POINTER_SET(dic) &&
- IC_RESULT(dic)->key == op->key
-/* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
- ) {
-
- /* we are interested only if defined in far space */
- /* or in stack space in case of + & - */
-
- /* if assigned to a non-symbol then return
- true */
- if (!IS_SYMOP(IC_RIGHT(dic)))
- break ;
-
- /* if the symbol is in far space then
- we should not */
- if (isOperandInFarSpace(IC_RIGHT(dic)))
- return NULL ;
-
- /* for + & - operations make sure that
- if it is on the stack it is the same
- as one of the three operands */
- if ((ic->op == '+' || ic->op == '-') &&
- OP_SYMBOL(IC_RIGHT(dic))->onStack) {
-
- if ( IC_RESULT(ic)->key != IC_RIGHT(dic)->key &&
- IC_LEFT(ic)->key != IC_RIGHT(dic)->key &&
- IC_RIGHT(ic)->key != IC_RIGHT(dic)->key)
- return NULL;
- }
-
- break ;
-
- }
+ iCode *dic;
- /* if we find an usage then we cannot delete it */
- if (IC_LEFT(dic) && IC_LEFT(dic)->key == op->key)
- return NULL;
-
- if (IC_RIGHT(dic) && IC_RIGHT(dic)->key == op->key)
- return NULL;
+ /* This routine is used to find sequences like
+ iTempAA = FOO;
+ ...; (intervening ops don't use iTempAA or modify FOO)
+ blah = blah + iTempAA;
- if (POINTER_SET(dic) && IC_RESULT(dic)->key == op->key)
- return NULL;
+ and eliminate the use of iTempAA, freeing up its register for
+ other uses.
+ */
+
+
+ for (dic = ic->prev; dic; dic = dic->prev)
+ {
+
+ /* if definition by assignment */
+ if (dic->op == '=' &&
+ !POINTER_SET (dic) &&
+ IC_RESULT (dic)->key == op->key
+/* && IS_TRUE_SYMOP(IC_RIGHT(dic)) */
+ )
+ break; /* found where this temp was defined */
+
+ /* if we find an usage then we cannot delete it */
+ if (IC_LEFT (dic) && IC_LEFT (dic)->key == op->key)
+ return NULL;
+
+ if (IC_RIGHT (dic) && IC_RIGHT (dic)->key == op->key)
+ return NULL;
+
+ if (POINTER_SET (dic) && IC_RESULT (dic)->key == op->key)
+ return NULL;
}
- /* now make sure that the right side of dic
- is not defined between ic & dic */
- if (dic) {
- iCode *sic = dic->next ;
+ if (!dic)
+ return NULL; /* didn't find any assignment to op */
+
+ /* we are interested only if defined in far space */
+ /* or in stack space in case of + & - */
+
+ /* if assigned to a non-symbol then don't repack regs */
+ if (!IS_SYMOP (IC_RIGHT (dic)))
+ return NULL;
+
+ /* if the symbol is volatile then we should not */
+ if (isOperandVolatile (IC_RIGHT (dic), TRUE))
+ return NULL;
+ /* XXX TODO --- should we be passing FALSE to isOperandVolatile()?
+ What does it mean for an iTemp to be volatile, anyway? Passing
+ TRUE is more cautious but may prevent possible optimizations */
+
+ /* if the symbol is in far space then we should not */
+ if (isOperandInFarSpace (IC_RIGHT (dic)))
+ return NULL;
+
+ /* for + & - operations make sure that
+ if it is on the stack it is the same
+ as one of the three operands */
+ if ((ic->op == '+' || ic->op == '-') &&
+ OP_SYMBOL (IC_RIGHT (dic))->onStack)
+ {
+
+ if (IC_RESULT (ic)->key != IC_RIGHT (dic)->key &&
+ IC_LEFT (ic)->key != IC_RIGHT (dic)->key &&
+ IC_RIGHT (ic)->key != IC_RIGHT (dic)->key)
+ return NULL;
+ }
+
+ /* now make sure that the right side of dic
+ is not defined between ic & dic */
+ if (dic)
+ {
+ iCode *sic = dic->next;
- for (; sic != ic ; sic = sic->next)
- if (IC_RESULT(sic) &&
- IC_RESULT(sic)->key == IC_RIGHT(dic)->key)
- return NULL;
+ for (; sic != ic; sic = sic->next)
+ if (IC_RESULT (sic) &&
+ IC_RESULT (sic)->key == IC_RIGHT (dic)->key)
+ return NULL;
}
- return dic;
-
-
+ return dic;
}
+/*-----------------------------------------------------------------*/
+/* reassignAliasedSym - used by packRegsForSupport to replace */
+/* redundant iTemp with equivalent symbol */
+/*-----------------------------------------------------------------*/
+static void
+reassignAliasedSym (eBBlock *ebp, iCode *assignment, iCode *use, operand *op)
+{
+ iCode *ic;
+ unsigned oldSymKey, newSymKey;
+
+ oldSymKey = op->key;
+ newSymKey = IC_RIGHT(assignment)->key;
+
+ /* only track live ranges of compiler-generated temporaries */
+ if (!IS_ITEMP(IC_RIGHT(assignment)))
+ newSymKey = 0;
+
+ /* update the live-value bitmaps */
+ for (ic = assignment; ic != use; ic = ic->next) {
+ bitVectUnSetBit (ic->rlive, oldSymKey);
+ if (newSymKey != 0)
+ ic->rlive = bitVectSetBit (ic->rlive, newSymKey);
+ }
+
+ /* update the sym of the used operand */
+ OP_SYMBOL(op) = OP_SYMBOL(IC_RIGHT(assignment));
+ op->key = OP_SYMBOL(op)->key;
+
+ /* update the sym's liverange */
+ if ( OP_LIVETO(op) < ic->seq )
+ setToRange(op, ic->seq, FALSE);
+
+ /* remove the assignment iCode now that its result is unused */
+ remiCodeFromeBBlock (ebp, assignment);
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(assignment))->defs, assignment->key);
+ hTabDeleteItem (&iCodehTab, assignment->key, assignment, DELETE_ITEM, NULL);
+}
+
+
/*-----------------------------------------------------------------*/
/* packRegsForSupport :- reduce some registers for support calls */
/*-----------------------------------------------------------------*/
-static int packRegsForSupport (iCode *ic, eBBlock *ebp)
+static int
+packRegsForSupport (iCode * ic, eBBlock * ebp)
{
- int change = 0 ;
- /* for the left & right operand :- look to see if the
- left was assigned a true symbol in far space in that
- case replace them */
- if (IS_ITEMP(IC_LEFT(ic)) &&
- OP_SYMBOL(IC_LEFT(ic))->liveTo <= ic->seq) {
- iCode *dic = findAssignToSym(IC_LEFT(ic),ic);
- iCode *sic;
-
- if (!dic)
- goto right ;
-
- /* found it we need to remove it from the
- block */
- for ( sic = dic; sic != ic ; sic = sic->next )
- bitVectUnSetBit(sic->rlive,IC_LEFT(ic)->key);
-
- IC_LEFT(ic)->operand.symOperand =
- IC_RIGHT(dic)->operand.symOperand;
- IC_LEFT(ic)->key = IC_RIGHT(dic)->operand.symOperand->key;
- remiCodeFromeBBlock(ebp,dic);
- hTabDeleteItem (&iCodehTab,dic->key,dic,DELETE_ITEM,NULL);
- change++;
+ iCode *dic;
+
+ /* for the left & right operand :- look to see if the
+ left was assigned a true symbol in far space in that
+ case replace them */
+
+ if (IS_ITEMP (IC_LEFT (ic)) &&
+ OP_SYMBOL (IC_LEFT (ic))->liveTo <= ic->seq)
+ {
+ dic = findAssignToSym (IC_LEFT (ic), ic);
+
+ if (dic)
+ {
+ /* found it we need to remove it from the block */
+ reassignAliasedSym (ebp, dic, ic, IC_LEFT(ic));
+ return 1;
+ }
}
-
- /* do the same for the right operand */
- right:
- if (!change &&
- IS_ITEMP(IC_RIGHT(ic)) &&
- OP_SYMBOL(IC_RIGHT(ic))->liveTo <= ic->seq) {
- iCode *dic = findAssignToSym(IC_RIGHT(ic),ic);
- iCode *sic;
-
- if (!dic)
- return change ;
-
- /* if this is a subtraction & the result
- is a true symbol in far space then don't pack */
- if (ic->op == '-' && IS_TRUE_SYMOP(IC_RESULT(dic))) {
- link *etype =getSpec(operandType(IC_RESULT(dic)));
- if (IN_FARSPACE(SPEC_OCLS(etype)))
- return change ;
+
+ /* do the same for the right operand */
+ if (IS_ITEMP (IC_RIGHT (ic)) &&
+ OP_SYMBOL (IC_RIGHT (ic))->liveTo <= ic->seq)
+ {
+ iCode *dic = findAssignToSym (IC_RIGHT (ic), ic);
+
+ if (dic)
+ {
+ /* if this is a subtraction & the result
+ is a true symbol in far space then don't pack */
+ if (ic->op == '-' && IS_TRUE_SYMOP (IC_RESULT (dic)))
+ {
+ sym_link *etype = getSpec (operandType (IC_RESULT (dic)));
+ if (IN_FARSPACE (SPEC_OCLS (etype)))
+ return 0;
+ }
+ /* found it we need to remove it from the
+ block */
+ reassignAliasedSym (ebp, dic, ic, IC_RIGHT(ic));
+
+ return 1;
}
- /* found it we need to remove it from the
- block */
- for ( sic = dic; sic != ic ; sic = sic->next )
- bitVectUnSetBit(sic->rlive,IC_RIGHT(ic)->key);
-
- IC_RIGHT(ic)->operand.symOperand =
- IC_RIGHT(dic)->operand.symOperand;
- IC_RIGHT(ic)->key = IC_RIGHT(dic)->operand.symOperand->key;
-
- remiCodeFromeBBlock(ebp,dic);
- hTabDeleteItem (&iCodehTab,dic->key,dic,DELETE_ITEM,NULL);
- change ++;
}
-
- return change ;
+
+ return 0;
}
#define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
/*-----------------------------------------------------------------*/
-/* packRegsForOneuse : - will reduce some registers for single Use */
+/* packRegsForOneuse : - will reduce some registers for single Use */
/*-----------------------------------------------------------------*/
-static iCode *packRegsForOneuse (iCode *ic, operand *op , eBBlock *ebp)
+static iCode *
+packRegsForOneuse (iCode * ic, operand * op, eBBlock * ebp)
{
- bitVect *uses ;
- iCode *dic, *sic;
+ bitVect *uses;
+ iCode *dic, *sic;
- /* if returning a literal then do nothing */
- if (!IS_SYMOP(op))
- return NULL;
-
- /* only upto 2 bytes since we cannot predict
- the usage of b, & acc */
- if (getSize(operandType(op)) > (fReturnSize - 2) &&
- ic->op != RETURN &&
- ic->op != SEND &&
- !POINTER_SET(ic) &&
- !POINTER_GET(ic))
- return NULL;
+ /* if returning a literal then do nothing */
+ if (!IS_SYMOP (op))
+ return NULL;
- /* this routine will mark the a symbol as used in one
- instruction use only && if the defintion is local
- (ie. within the basic block) && has only one definition &&
- that definiion is either a return value from a
- function or does not contain any variables in
- far space */
- uses = bitVectCopy(OP_USES(op));
- bitVectUnSetBit(uses,ic->key); /* take away this iCode */
- if (!bitVectIsZero(uses)) /* has other uses */
- return NULL ;
-
- /* if it has only one defintion */
- if (bitVectnBitsOn(OP_DEFS(op)) > 1)
- return NULL ; /* has more than one definition */
-
- /* get the that definition */
- if (!(dic =
- hTabItemWithKey(iCodehTab,
- bitVectFirstBit(OP_DEFS(op)))))
- return NULL ;
-
- /* found the definition now check if it is local */
- if (dic->seq < ebp->fSeq ||
- dic->seq > ebp->lSeq)
- return NULL ; /* non-local */
-
- /* now check if it is the return from
- a function call */
- if (dic->op == CALL || dic->op == PCALL ) {
- if (ic->op != SEND && ic->op != RETURN) {
- OP_SYMBOL(op)->ruonly = 1;
- return dic;
+ /* only upto 2 bytes since we cannot predict
+ the usage of b, & acc */
+ if (getSize (operandType (op)) > (fReturnSizeMCS51 - 2))
+ return NULL;
+
+ if (ic->op != RETURN &&
+ ic->op != SEND &&
+ !POINTER_SET (ic) &&
+ !POINTER_GET (ic))
+ return NULL;
+
+ if (ic->op == SEND && ic->argreg != 1) return NULL;
+
+ /* this routine will mark the a symbol as used in one
+ instruction use only && if the defintion is local
+ (ie. within the basic block) && has only one definition &&
+ that definiion is either a return value from a
+ function or does not contain any variables in
+ far space */
+ uses = bitVectCopy (OP_USES (op));
+ bitVectUnSetBit (uses, ic->key); /* take away this iCode */
+ if (!bitVectIsZero (uses)) /* has other uses */
+ return NULL;
+
+ /* if it has only one defintion */
+ if (bitVectnBitsOn (OP_DEFS (op)) > 1)
+ return NULL; /* has more than one definition */
+
+ /* get that definition */
+ if (!(dic =
+ hTabItemWithKey (iCodehTab,
+ bitVectFirstBit (OP_DEFS (op)))))
+ return NULL;
+
+ /* if that only usage is a cast */
+ if (dic->op == CAST) {
+ /* to a bigger type */
+ if (getSize(OP_SYM_TYPE(IC_RESULT(dic))) >
+ getSize(OP_SYM_TYPE(IC_RIGHT(dic)))) {
+ /* than we can not, since we cannot predict the usage of b & acc */
+ return NULL;
+ }
+ }
+
+ /* found the definition now check if it is local */
+ if (dic->seq < ebp->fSeq ||
+ dic->seq > ebp->lSeq)
+ return NULL; /* non-local */
+
+ /* now check if it is the return from
+ a function call */
+ if (dic->op == CALL || dic->op == PCALL)
+ {
+ if (ic->op != SEND && ic->op != RETURN &&
+ !POINTER_SET(ic) && !POINTER_GET(ic))
+ {
+ OP_SYMBOL (op)->ruonly = 1;
+ return dic;
}
- dic = dic->next ;
+ dic = dic->next;
}
-
-
- /* otherwise check that the definition does
- not contain any symbols in far space */
- if (isOperandInFarSpace(IC_LEFT(dic)) ||
- isOperandInFarSpace(IC_RIGHT(dic)) ||
- IS_OP_RUONLY(IC_LEFT(ic)) ||
- IS_OP_RUONLY(IC_RIGHT(ic)) ) {
- return NULL;
+
+
+ /* otherwise check that the definition does
+ not contain any symbols in far space */
+ if (isOperandInFarSpace (IC_LEFT (dic)) ||
+ isOperandInFarSpace (IC_RIGHT (dic)) ||
+ IS_OP_RUONLY (IC_LEFT (ic)) ||
+ IS_OP_RUONLY (IC_RIGHT (ic)))
+ {
+ return NULL;
}
-
- /* if pointer set then make sure the pointer
- is one byte */
- if (POINTER_SET(dic) &&
- !IS_DATA_PTR(aggrToPtr(operandType(IC_RESULT(dic)),FALSE)))
- return NULL ;
-
- if (POINTER_GET(dic) &&
- !IS_DATA_PTR(aggrToPtr(operandType(IC_LEFT(dic)),FALSE)))
- return NULL ;
-
- sic = dic;
-
- /* also make sure the intervenening instructions
- don't have any thing in far space */
- for (dic = dic->next ; dic && dic != ic && sic != ic; dic = dic->next) {
-
- /* if there is an intervening function call then no */
- if (dic->op == CALL || dic->op == PCALL)
- return NULL;
- /* if pointer set then make sure the pointer
- is one byte */
- if (POINTER_SET(dic) &&
- !IS_DATA_PTR(aggrToPtr(operandType(IC_RESULT(dic)),FALSE)))
- return NULL ;
-
- if (POINTER_GET(dic) &&
- !IS_DATA_PTR(aggrToPtr(operandType(IC_LEFT(dic)),FALSE)))
- return NULL ;
-
- /* if address of & the result is remat the okay */
- if (dic->op == ADDRESS_OF &&
- OP_SYMBOL(IC_RESULT(dic))->remat)
- continue ;
-
- /* if operand has size of three or more & this
- operation is a '*','/' or '%' then 'b' may
- cause a problem */
- if (( dic->op == '%' || dic->op == '/' || dic->op == '*') &&
- getSize(operandType(op)) >= 3)
- return NULL;
-
- /* if left or right or result is in far space */
- if (isOperandInFarSpace(IC_LEFT(dic)) ||
- isOperandInFarSpace(IC_RIGHT(dic)) ||
- isOperandInFarSpace(IC_RESULT(dic)) ||
- IS_OP_RUONLY(IC_LEFT(dic)) ||
- IS_OP_RUONLY(IC_RIGHT(dic)) ||
- IS_OP_RUONLY(IC_RESULT(dic)) ) {
- return NULL;
+
+ /* if pointer set then make sure the pointer
+ is one byte */
+ if (POINTER_SET (dic) &&
+ !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
+ return NULL;
+
+ if (POINTER_GET (dic) &&
+ !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
+ return NULL;
+
+ sic = dic;
+
+ /* also make sure the intervenening instructions
+ don't have any thing in far space */
+ for (dic = dic->next; dic && dic != ic && sic != ic; dic = dic->next)
+ {
+
+ /* if there is an intervening function call then no */
+ if (dic->op == CALL || dic->op == PCALL)
+ return NULL;
+ /* if pointer set then make sure the pointer
+ is one byte */
+ if (POINTER_SET (dic) &&
+ !IS_DATA_PTR (aggrToPtr (operandType (IC_RESULT (dic)), FALSE)))
+ return NULL;
+
+ if (POINTER_GET (dic) &&
+ !IS_DATA_PTR (aggrToPtr (operandType (IC_LEFT (dic)), FALSE)))
+ return NULL;
+
+ /* if address of & the result is remat the okay */
+ if (dic->op == ADDRESS_OF &&
+ OP_SYMBOL (IC_RESULT (dic))->remat)
+ continue;
+
+ /* if operand has size of three or more & this
+ operation is a '*','/' or '%' then 'b' may
+ cause a problem */
+ if ((dic->op == '%' || dic->op == '/' || dic->op == '*') &&
+ getSize (operandType (op)) >= 3)
+ return NULL;
+
+ /* if left or right or result is in far space */
+ if (isOperandInFarSpace (IC_LEFT (dic)) ||
+ isOperandInFarSpace (IC_RIGHT (dic)) ||
+ isOperandInFarSpace (IC_RESULT (dic)) ||
+ IS_OP_RUONLY (IC_LEFT (dic)) ||
+ IS_OP_RUONLY (IC_RIGHT (dic)) ||
+ IS_OP_RUONLY (IC_RESULT (dic)))
+ {
+ return NULL;
}
+ /* if left or right or result is on stack */
+ if (isOperandOnStack(IC_LEFT(dic)) ||
+ isOperandOnStack(IC_RIGHT(dic)) ||
+ isOperandOnStack(IC_RESULT(dic))) {
+ return NULL;
+ }
}
-
- OP_SYMBOL(op)->ruonly = 1;
- return sic;
-
+
+ OP_SYMBOL (op)->ruonly = 1;
+ return sic;
}
/*-----------------------------------------------------------------*/
/* isBitwiseOptimizable - requirements of JEAN LOUIS VERN */
/*-----------------------------------------------------------------*/
-static bool isBitwiseOptimizable (iCode *ic)
+static bool
+isBitwiseOptimizable (iCode * ic)
{
- link *ltype = getSpec(operandType(IC_LEFT(ic)));
- link *rtype = getSpec(operandType(IC_RIGHT(ic)));
-
- /* bitwise operations are considered optimizable
- under the following conditions (Jean-Louis VERN)
-
- x & lit
- bit & bit
- bit & x
- bit ^ bit
- bit ^ x
- x ^ lit
- x | lit
- bit | bit
- bit | x
- */
- if ( IS_LITERAL(rtype) ||
- (IS_BITVAR(ltype) && IN_BITSPACE(SPEC_OCLS(ltype))))
- return TRUE ;
- else
- return FALSE ;
+ sym_link *ltype = getSpec (operandType (IC_LEFT (ic)));
+ sym_link *rtype = getSpec (operandType (IC_RIGHT (ic)));
+
+ /* bitwise operations are considered optimizable
+ under the following conditions (Jean-Louis VERN)
+
+ x & lit
+ bit & bit
+ bit & x
+ bit ^ bit
+ bit ^ x
+ x ^ lit
+ x | lit
+ bit | bit
+ bit | x
+ */
+ if (IS_LITERAL(rtype) ||
+ (IS_BITVAR (ltype) && IN_BITSPACE (SPEC_OCLS (ltype))))
+ return TRUE;
+ else
+ return FALSE;
}
/*-----------------------------------------------------------------*/
-/* packRegsForAccUse - pack registers for acc use */
+/* isCommutativeOp - tests whether this op cares what order its */
+/* operands are in */
+/*-----------------------------------------------------------------*/
+bool isCommutativeOp(unsigned int op)
+{
+ if (op == '+' || op == '*' || op == EQ_OP ||
+ op == '^' || op == '|' || op == BITWISEAND)
+ return TRUE;
+ else
+ return FALSE;
+}
+
+/*-----------------------------------------------------------------*/
+/* operandUsesAcc - determines whether the code generated for this */
+/* operand will have to use the accumulator */
/*-----------------------------------------------------------------*/
-static void packRegsForAccUse (iCode *ic)
+bool operandUsesAcc(operand *op)
{
- iCode *uic;
+ if (!op)
+ return FALSE;
+
+ if (IS_SYMOP(op)) {
+ symbol *sym = OP_SYMBOL(op);
+ memmap *symspace;
+
+ if (sym->accuse)
+ return TRUE; /* duh! */
+
+ if (IN_STACK(sym->etype) || sym->onStack ||
+ (SPIL_LOC(op) && SPIL_LOC(op)->onStack))
+ return TRUE; /* acc is used to calc stack offset */
+
+ if (IS_ITEMP(op))
+ {
+ if (SPIL_LOC(op)) {
+ sym = SPIL_LOC(op); /* if spilled, look at spill location */
+ } else {
+ return FALSE; /* more checks? */
+ }
+ }
+
+ symspace = SPEC_OCLS(sym->etype);
+
+ if (sym->iaccess && symspace->paged)
+ return TRUE; /* must fetch paged indirect sym via accumulator */
- /* if + or - then it has to be one byte result */
- if ((ic->op == '+' || ic->op == '-')
- && getSize(operandType(IC_RESULT(ic))) > 1)
- return ;
+ if (IN_BITSPACE(symspace))
+ return TRUE; /* fetching bit vars uses the accumulator */
- /* if shift operation make sure right side is not a literal */
- if (ic->op == RIGHT_OP &&
- ( isOperandLiteral(IC_RIGHT(ic)) ||
- getSize(operandType(IC_RESULT(ic))) > 1))
- return ;
-
- if (ic->op == LEFT_OP &&
- ( isOperandLiteral(IC_RIGHT(ic)) ||
- getSize(operandType(IC_RESULT(ic))) > 1))
- return ;
-
- if (IS_BITWISE_OP(ic) &&
- getSize(operandType(IC_RESULT(ic))) > 1)
- return ;
-
-
- /* has only one definition */
- if (bitVectnBitsOn(OP_DEFS(IC_RESULT(ic))) > 1)
- return ;
+ if (IN_FARSPACE(symspace) || IN_CODESPACE(symspace))
+ return TRUE; /* fetched via accumulator and dptr */
+ }
- /* has only one use */
- if (bitVectnBitsOn(OP_USES(IC_RESULT(ic))) > 1)
- return ;
+ return FALSE;
+}
- /* and the usage immediately follows this iCode */
- if (!(uic = hTabItemWithKey(iCodehTab,
- bitVectFirstBit(OP_USES(IC_RESULT(ic))))))
- return ;
+/*-----------------------------------------------------------------*/
+/* packRegsForAccUse - pack registers for acc use */
+/*-----------------------------------------------------------------*/
+static void
+packRegsForAccUse (iCode * ic)
+{
+ iCode *uic;
- if (ic->next != uic)
- return ;
-
- /* if it is a conditional branch then we definitely can */
- if (uic->op == IFX )
- goto accuse;
+ /* if this is an aggregate, e.g. a one byte char array */
+ if (IS_AGGREGATE(operandType(IC_RESULT(ic)))) {
+ return;
+ }
+
+ /* if we are calling a reentrant function that has stack parameters */
+ if (ic->op == CALL &&
+ IFFUNC_ISREENT(operandType(IC_LEFT(ic))) &&
+ FUNC_HASSTACKPARM(operandType(IC_LEFT(ic))))
+ return;
+
+ if (ic->op == PCALL &&
+ IFFUNC_ISREENT(operandType(IC_LEFT(ic))->next) &&
+ FUNC_HASSTACKPARM(operandType(IC_LEFT(ic))->next))
+ return;
+
+ /* if + or - then it has to be one byte result */
+ if ((ic->op == '+' || ic->op == '-')
+ && getSize (operandType (IC_RESULT (ic))) > 1)
+ return;
- if ( uic->op == JUMPTABLE )
- return ;
+ /* if shift operation make sure right side is not a literal */
+ if (ic->op == RIGHT_OP &&
+ (isOperandLiteral (IC_RIGHT (ic)) ||
+ getSize (operandType (IC_RESULT (ic))) > 1))
+ return;
- /* if the usage is not is an assignment
- or an arithmetic / bitwise / shift operation then not */
- if (POINTER_SET(uic) &&
- getSize(aggrToPtr(operandType(IC_RESULT(uic)),FALSE)) > 1)
- return;
+ if (ic->op == LEFT_OP &&
+ (isOperandLiteral (IC_RIGHT (ic)) ||
+ getSize (operandType (IC_RESULT (ic))) > 1))
+ return;
- if (uic->op != '=' &&
- !IS_ARITHMETIC_OP(uic) &&
- !IS_BITWISE_OP(uic) &&
- uic->op != LEFT_OP &&
- uic->op != RIGHT_OP )
- return;
+ if (IS_BITWISE_OP (ic) &&
+ getSize (operandType (IC_RESULT (ic))) > 1)
+ return;
- /* if used in ^ operation then make sure right is not a
- literl */
- if (uic->op == '^' && isOperandLiteral(IC_RIGHT(uic)))
- return ;
- /* if shift operation make sure right side is not a literal */
- if (uic->op == RIGHT_OP &&
- ( isOperandLiteral(IC_RIGHT(uic)) ||
- getSize(operandType(IC_RESULT(uic))) > 1))
- return ;
+ /* has only one definition */
+ if (bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) > 1)
+ return;
- if (uic->op == LEFT_OP &&
- ( isOperandLiteral(IC_RIGHT(uic)) ||
- getSize(operandType(IC_RESULT(uic))) > 1))
- return ;
-
- /* make sure that the result of this icode is not on the
- stack, since acc is used to compute stack offset */
- if (IS_TRUE_SYMOP(IC_RESULT(uic)) &&
- OP_SYMBOL(IC_RESULT(uic))->onStack)
- return ;
+ /* has only one use */
+ if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) > 1)
+ return;
- /* if either one of them in far space then we cannot */
- if ((IS_TRUE_SYMOP(IC_LEFT(uic)) &&
- isOperandInFarSpace(IC_LEFT(uic))) ||
- (IS_TRUE_SYMOP(IC_RIGHT(uic)) &&
- isOperandInFarSpace(IC_RIGHT(uic))))
- return ;
+ /* and the usage immediately follows this iCode */
+ if (!(uic = hTabItemWithKey (iCodehTab,
+ bitVectFirstBit (OP_USES (IC_RESULT (ic))))))
+ return;
- /* if the usage has only one operand then we can */
- if (IC_LEFT(uic) == NULL ||
- IC_RIGHT(uic) == NULL)
- goto accuse;
+ if (ic->next != uic)
+ return;
- /* make sure this is on the left side if not
- a '+' since '+' is commutative */
- if (ic->op != '+' &&
- IC_LEFT(uic)->key != IC_RESULT(ic)->key)
- return;
+ /* if it is a conditional branch then we definitely can */
+ if (uic->op == IFX)
+ goto accuse;
- /* if one of them is a literal then we can */
- if ((IC_LEFT(uic) && IS_OP_LITERAL(IC_LEFT(uic))) ||
- (IC_RIGHT(uic) && IS_OP_LITERAL(IC_RIGHT(uic)))) {
- OP_SYMBOL(IC_RESULT(ic))->accuse = 1;
- return ;
- }
+ if (uic->op == JUMPTABLE)
+ return;
- /* if the other one is not on stack then we can */
- if (IC_LEFT(uic)->key == IC_RESULT(ic)->key &&
- (IS_ITEMP(IC_RIGHT(uic)) ||
- (IS_TRUE_SYMOP(IC_RIGHT(uic)) &&
- !OP_SYMBOL(IC_RIGHT(uic))->onStack)))
- goto accuse;
-
- if (IC_RIGHT(uic)->key == IC_RESULT(ic)->key &&
- (IS_ITEMP(IC_LEFT(uic)) ||
- (IS_TRUE_SYMOP(IC_LEFT(uic)) &&
- !OP_SYMBOL(IC_LEFT(uic))->onStack)))
- goto accuse ;
+ if (POINTER_SET (uic) &&
+ getSize (aggrToPtr (operandType (IC_RESULT (uic)), FALSE)) > 1)
+ return;
- return ;
+ /* if the usage is not is an assignment
+ or an arithmetic / bitwise / shift operation then not */
+ if (uic->op != '=' &&
+ !IS_ARITHMETIC_OP (uic) &&
+ !IS_BITWISE_OP (uic) &&
+ uic->op != LEFT_OP &&
+ uic->op != RIGHT_OP)
+ return;
+
+ /* if used in ^ operation then make sure right is not a
+ literal (WIML: Why is this?) */
+ if (uic->op == '^' && isOperandLiteral (IC_RIGHT (uic)))
+ return;
+
+ /* if shift operation make sure right side is not a literal */
+ /* WIML: Why is this? */
+ if (uic->op == RIGHT_OP &&
+ (isOperandLiteral (IC_RIGHT (uic)) ||
+ getSize (operandType (IC_RESULT (uic))) > 1))
+ return;
+ if (uic->op == LEFT_OP &&
+ (isOperandLiteral (IC_RIGHT (uic)) ||
+ getSize (operandType (IC_RESULT (uic))) > 1))
+ return;
+
+ /* make sure that the result of this icode is not on the
+ stack, since acc is used to compute stack offset */
+#if 0
+ if (IS_TRUE_SYMOP (IC_RESULT (uic)) &&
+ OP_SYMBOL (IC_RESULT (uic))->onStack)
+ return;
+#else
+ if (isOperandOnStack(IC_RESULT(uic)))
+ return;
+#endif
+
+ /* if the usage has only one operand then we can */
+ if (IC_LEFT (uic) == NULL ||
+ IC_RIGHT (uic) == NULL)
+ goto accuse;
+
+ /* if the other operand uses the accumulator then we cannot */
+ if ( (IC_LEFT(uic)->key == IC_RESULT(ic)->key &&
+ operandUsesAcc(IC_RIGHT(uic))) ||
+ (IC_RIGHT(uic)->key == IC_RESULT(ic)->key &&
+ operandUsesAcc(IC_LEFT(uic))) )
+ return;
+
+ /* make sure this is on the left side if not commutative */
+ /* except for '-', which has been written to be able to
+ handle reversed operands */
+ if (!(isCommutativeOp(ic->op) || ic->op == '-') &&
+ IC_LEFT (uic)->key != IC_RESULT (ic)->key)
+ return;
+
+#if 0
+ // this is too dangerous and need further restrictions
+ // see bug #447547
+
+ /* if one of them is a literal then we can */
+ if ((IC_LEFT (uic) && IS_OP_LITERAL (IC_LEFT (uic))) ||
+ (IC_RIGHT (uic) && IS_OP_LITERAL (IC_RIGHT (uic))))
+ {
+ OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
+ return;
+ }
+#endif
+
+accuse:
+ OP_SYMBOL (IC_RESULT (ic))->accuse = 1;
- accuse:
- OP_SYMBOL(IC_RESULT(ic))->accuse = 1;
-
-
}
/*-----------------------------------------------------------------*/
/* packForPush - hueristics to reduce iCode for pushing */
/*-----------------------------------------------------------------*/
-static void packForPush(iCode *ic, eBBlock *ebp)
+static void
+packForPush (iCode * ic, eBBlock ** ebpp, int blockno)
{
- iCode *dic;
+ iCode *dic, *lic;
+ bitVect *dbv;
+ struct eBBlock * ebp=ebpp[blockno];
- if (ic->op != IPUSH || !IS_ITEMP(IC_LEFT(ic)))
- return ;
+ if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
+ return;
- /* must have only definition & one usage */
- if (bitVectnBitsOn(OP_DEFS(IC_LEFT(ic))) != 1 ||
- bitVectnBitsOn(OP_USES(IC_LEFT(ic))) != 1 )
- return ;
-
- /* find the definition */
- if (!(dic = hTabItemWithKey(iCodehTab,
- bitVectFirstBit(OP_DEFS(IC_LEFT(ic))))))
- return ;
+ /* must have only definition & one usage */
+ if (bitVectnBitsOn (OP_DEFS (IC_LEFT (ic))) != 1 ||
+ bitVectnBitsOn (OP_USES (IC_LEFT (ic))) != 1)
+ return;
- if (dic->op != '=' || POINTER_SET(dic))
- return;
+ /* find the definition */
+ if (!(dic = hTabItemWithKey (iCodehTab,
+ bitVectFirstBit (OP_DEFS (IC_LEFT (ic))))))
+ return;
- /* we now we know that it has one & only one def & use
- and the that the definition is an assignment */
- IC_LEFT(ic) = IC_RIGHT(dic);
+ if (dic->op != '=' || POINTER_SET (dic))
+ return;
- remiCodeFromeBBlock(ebp,dic);
- hTabDeleteItem (&iCodehTab,dic->key,dic,DELETE_ITEM,NULL);
+ if (dic->seq < ebp->fSeq) { // Evelyn did this
+ int i;
+ for (i=0; i<blockno; i++) {
+ if (dic->seq >= ebpp[i]->fSeq && dic->seq <= ebpp[i]->lSeq) {
+ ebp=ebpp[i];
+ break;
+ }
+ }
+ wassert (i!=blockno); // no way to recover from here
+ }
+
+ if (IS_SYMOP(IC_RIGHT(dic))) {
+ /* make sure the right side does not have any definitions
+ inbetween */
+ dbv = OP_DEFS(IC_RIGHT(dic));
+ for (lic = ic; lic && lic != dic ; lic = lic->prev) {
+ if (bitVectBitValue(dbv,lic->key))
+ return ;
+ }
+ /* make sure they have the same type */
+ if (IS_SPEC(operandType(IC_LEFT(ic))))
+ {
+ sym_link *itype=operandType(IC_LEFT(ic));
+ sym_link *ditype=operandType(IC_RIGHT(dic));
+
+ if (SPEC_USIGN(itype)!=SPEC_USIGN(ditype) ||
+ SPEC_LONG(itype)!=SPEC_LONG(ditype))
+ return;
+ }
+ /* extend the live range of replaced operand if needed */
+ if (OP_SYMBOL(IC_RIGHT(dic))->liveTo < ic->seq) {
+ OP_SYMBOL(IC_RIGHT(dic))->liveTo = ic->seq;
+ }
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
+ }
+
+ /* we now we know that it has one & only one def & use
+ and the that the definition is an assignment */
+ ReplaceOpWithCheaperOp(&IC_LEFT (ic), IC_RIGHT (dic));
+ remiCodeFromeBBlock (ebp, dic);
+ hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
}
/*-----------------------------------------------------------------*/
/* packRegisters - does some transformations to reduce register */
/* pressure */
/*-----------------------------------------------------------------*/
-static void packRegisters (eBBlock *ebp)
+static void
+packRegisters (eBBlock ** ebpp, int blockno)
{
- iCode *ic ;
- int change = 0 ;
-
- while (1) {
-
- change = 0;
-
- /* look for assignments of the form */
- /* iTempNN = TRueSym (someoperation) SomeOperand */
- /* .... */
- /* TrueSym := iTempNN:1 */
- for ( ic = ebp->sch ; ic ; ic = ic->next ) {
-
-
- /* find assignment of the form TrueSym := iTempNN:1 */
- if (ic->op == '=' && !POINTER_SET(ic))
- change += packRegsForAssign(ic,ebp);
+ iCode *ic;
+ int change = 0;
+ eBBlock *ebp=ebpp[blockno];
+
+ while (1)
+ {
+
+ change = 0;
+
+ /* look for assignments of the form */
+ /* iTempNN = TRueSym (someoperation) SomeOperand */
+ /* .... */
+ /* TrueSym := iTempNN:1 */
+ for (ic = ebp->sch; ic; ic = ic->next)
+ {
+ /* find assignment of the form TrueSym := iTempNN:1 */
+ if (ic->op == '=' && !POINTER_SET (ic))
+ change += packRegsForAssign (ic, ebp);
}
- if (!change)
- break;
+ if (!change)
+ break;
}
-
- for ( ic = ebp->sch ; ic ; ic = ic->next ) {
-
- /* if this is an itemp & result of a address of a true sym
- then mark this as rematerialisable */
- if (ic->op == ADDRESS_OF &&
- IS_ITEMP(IC_RESULT(ic)) &&
- IS_TRUE_SYMOP(IC_LEFT(ic)) &&
- bitVectnBitsOn(OP_DEFS(IC_RESULT(ic))) == 1 &&
- !OP_SYMBOL(IC_LEFT(ic))->onStack ) {
-
- OP_SYMBOL(IC_RESULT(ic))->remat = 1;
- OP_SYMBOL(IC_RESULT(ic))->rematiCode = ic;
- OP_SYMBOL(IC_RESULT(ic))->usl.spillLoc = NULL;
+
+ for (ic = ebp->sch; ic; ic = ic->next)
+ {
+ /* if this is an itemp & result of an address of a true sym
+ then mark this as rematerialisable */
+ if (ic->op == ADDRESS_OF &&
+ IS_ITEMP (IC_RESULT (ic)) &&
+ IS_TRUE_SYMOP (IC_LEFT (ic)) &&
+ bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
+ !OP_SYMBOL (IC_LEFT (ic))->onStack)
+ {
+
+ OP_SYMBOL (IC_RESULT (ic))->remat = 1;
+ OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
+ OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
}
-
- /* if straight assignment then carry remat flag if
- this is the only definition */
- if (ic->op == '=' &&
- !POINTER_SET(ic) &&
- IS_SYMOP(IC_RIGHT(ic)) &&
- OP_SYMBOL(IC_RIGHT(ic))->remat &&
- bitVectnBitsOn(OP_SYMBOL(IC_RESULT(ic))->defs) <= 1) {
-
- OP_SYMBOL(IC_RESULT(ic))->remat =
- OP_SYMBOL(IC_RIGHT(ic))->remat;
- OP_SYMBOL(IC_RESULT(ic))->rematiCode =
- OP_SYMBOL(IC_RIGHT(ic))->rematiCode ;
+
+ /* if straight assignment then carry remat flag if
+ this is the only definition */
+ if (ic->op == '=' &&
+ !POINTER_SET (ic) &&
+ IS_SYMOP (IC_RIGHT (ic)) &&
+ OP_SYMBOL (IC_RIGHT (ic))->remat &&
+ !IS_CAST_ICODE(OP_SYMBOL (IC_RIGHT (ic))->rematiCode) &&
+ bitVectnBitsOn (OP_SYMBOL (IC_RESULT (ic))->defs) <= 1)
+ {
+
+ OP_SYMBOL (IC_RESULT (ic))->remat =
+ OP_SYMBOL (IC_RIGHT (ic))->remat;
+ OP_SYMBOL (IC_RESULT (ic))->rematiCode =
+ OP_SYMBOL (IC_RIGHT (ic))->rematiCode;
}
- /* if this is a +/- operation with a rematerizable
- then mark this as rematerializable as well */
- if ((ic->op == '+' || ic->op == '-') &&
- (IS_SYMOP(IC_LEFT(ic)) &&
- IS_ITEMP(IC_RESULT(ic)) &&
- OP_SYMBOL(IC_LEFT(ic))->remat &&
- bitVectnBitsOn(OP_DEFS(IC_RESULT(ic))) == 1 &&
- IS_OP_LITERAL(IC_RIGHT(ic))) ) {
-
- int i = operandLitValue(IC_RIGHT(ic));
- OP_SYMBOL(IC_RESULT(ic))->remat = 1;
- OP_SYMBOL(IC_RESULT(ic))->rematiCode = ic;
- OP_SYMBOL(IC_RESULT(ic))->usl.spillLoc = NULL;
+ /* if cast to a generic pointer & the pointer being
+ cast is remat, then we can remat this cast as well */
+ if (ic->op == CAST &&
+ IS_SYMOP(IC_RIGHT(ic)) &&
+ OP_SYMBOL(IC_RIGHT(ic))->remat ) {
+ sym_link *to_type = operandType(IC_LEFT(ic));
+ sym_link *from_type = operandType(IC_RIGHT(ic));
+ if (IS_GENPTR(to_type) && IS_PTR(from_type)) {
+ OP_SYMBOL (IC_RESULT (ic))->remat = 1;
+ OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
+ OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
+ }
+ }
+
+ /* if this is a +/- operation with a rematerizable
+ then mark this as rematerializable as well */
+ if ((ic->op == '+' || ic->op == '-') &&
+ (IS_SYMOP (IC_LEFT (ic)) &&
+ IS_ITEMP (IC_RESULT (ic)) &&
+ IS_OP_LITERAL (IC_RIGHT (ic))) &&
+ OP_SYMBOL (IC_LEFT (ic))->remat &&
+ (!IS_SYMOP (IC_RIGHT (ic)) || !IS_CAST_ICODE(OP_SYMBOL (IC_RIGHT (ic))->rematiCode)) &&
+ bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1)
+ {
+ OP_SYMBOL (IC_RESULT (ic))->remat = 1;
+ OP_SYMBOL (IC_RESULT (ic))->rematiCode = ic;
+ OP_SYMBOL (IC_RESULT (ic))->usl.spillLoc = NULL;
}
- /* mark the pointer usages */
- if (POINTER_SET(ic))
- OP_SYMBOL(IC_RESULT(ic))->uptr = 1;
-
- if (POINTER_GET(ic))
- OP_SYMBOL(IC_LEFT(ic))->uptr = 1;
-
- if (!SKIP_IC2(ic)) {
- /* if we are using a symbol on the stack
- then we should say mcs51_ptrRegReq */
- if (ic->op == IFX && IS_SYMOP(IC_COND(ic)))
- mcs51_ptrRegReq += ((OP_SYMBOL(IC_COND(ic))->onStack ||
- OP_SYMBOL(IC_COND(ic))->iaccess) ? 1 : 0);
- else
- if (ic->op == JUMPTABLE && IS_SYMOP(IC_JTCOND(ic)))
- mcs51_ptrRegReq += ((OP_SYMBOL(IC_JTCOND(ic))->onStack ||
- OP_SYMBOL(IC_JTCOND(ic))->iaccess) ? 1 : 0);
- else {
- if (IS_SYMOP(IC_LEFT(ic)))
- mcs51_ptrRegReq += ((OP_SYMBOL(IC_LEFT(ic))->onStack ||
- OP_SYMBOL(IC_LEFT(ic))->iaccess) ? 1 : 0);
- if (IS_SYMOP(IC_RIGHT(ic)))
- mcs51_ptrRegReq += ((OP_SYMBOL(IC_RIGHT(ic))->onStack ||
- OP_SYMBOL(IC_RIGHT(ic))->iaccess) ? 1 : 0);
- if (IS_SYMOP(IC_RESULT(ic)))
- mcs51_ptrRegReq += ((OP_SYMBOL(IC_RESULT(ic))->onStack ||
- OP_SYMBOL(IC_RESULT(ic))->iaccess) ? 1 : 0);
- }
+ /* mark the pointer usages */
+ if (POINTER_SET (ic))
+ OP_SYMBOL (IC_RESULT (ic))->uptr = 1;
+
+ if (POINTER_GET (ic) &&
+ IS_SYMOP(IC_LEFT (ic)))
+ OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
+
+ if (!SKIP_IC2 (ic))
+ {
+ /* if we are using a symbol on the stack
+ then we should say mcs51_ptrRegReq */
+ if (ic->op == IFX && IS_SYMOP (IC_COND (ic)))
+ mcs51_ptrRegReq += ((OP_SYMBOL (IC_COND (ic))->onStack ||
+ OP_SYMBOL (IC_COND (ic))->iaccess) ? 1 : 0);
+ else if (ic->op == JUMPTABLE && IS_SYMOP (IC_JTCOND (ic)))
+ mcs51_ptrRegReq += ((OP_SYMBOL (IC_JTCOND (ic))->onStack ||
+ OP_SYMBOL (IC_JTCOND (ic))->iaccess) ? 1 : 0);
+ else
+ {
+ if (IS_SYMOP (IC_LEFT (ic)))
+ mcs51_ptrRegReq += ((OP_SYMBOL (IC_LEFT (ic))->onStack ||
+ OP_SYMBOL (IC_LEFT (ic))->iaccess) ? 1 : 0);
+ if (IS_SYMOP (IC_RIGHT (ic)))
+ mcs51_ptrRegReq += ((OP_SYMBOL (IC_RIGHT (ic))->onStack ||
+ OP_SYMBOL (IC_RIGHT (ic))->iaccess) ? 1 : 0);
+ if (IS_SYMOP (IC_RESULT (ic)))
+ mcs51_ptrRegReq += ((OP_SYMBOL (IC_RESULT (ic))->onStack ||
+ OP_SYMBOL (IC_RESULT (ic))->iaccess) ? 1 : 0);
+ }
}
- /* if the condition of an if instruction
- is defined in the previous instruction then
- mark the itemp as a conditional */
- if ((IS_CONDITIONAL(ic) ||
- ( ( ic->op == BITWISEAND ||
- ic->op == '|' ||
- ic->op == '^' ) &&
- isBitwiseOptimizable(ic))) &&
- ic->next && ic->next->op == IFX &&
- isOperandEqual(IC_RESULT(ic),IC_COND(ic->next)) &&
- OP_SYMBOL(IC_RESULT(ic))->liveTo <= ic->next->seq) {
-
- OP_SYMBOL(IC_RESULT(ic))->regType = REG_CND;
- continue ;
+ /* if the condition of an if instruction
+ is defined in the previous instruction and
+ this is the only usage then
+ mark the itemp as a conditional */
+ if ((IS_CONDITIONAL (ic) ||
+ (IS_BITWISE_OP(ic) && isBitwiseOptimizable (ic))) &&
+ ic->next && ic->next->op == IFX &&
+ bitVectnBitsOn (OP_USES(IC_RESULT(ic)))==1 &&
+ isOperandEqual (IC_RESULT (ic), IC_COND (ic->next)) &&
+ OP_SYMBOL (IC_RESULT (ic))->liveTo <= ic->next->seq)
+ {
+ OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
+ continue;
}
-
- /* reduce for support function calls */
- if (ic->supportRtn || ic->op == '+' || ic->op == '-' )
- packRegsForSupport (ic,ebp);
-
- /* some cases the redundant moves can
- can be eliminated for return statements */
- if ((ic->op == RETURN || ic->op == SEND) &&
- !isOperandInFarSpace(IC_LEFT(ic)) &&
- options.model == MODEL_SMALL)
- packRegsForOneuse (ic,IC_LEFT(ic),ebp);
-
- /* if pointer set & left has a size more than
- one and right is not in far space */
- if (POINTER_SET(ic) &&
- !isOperandInFarSpace(IC_RIGHT(ic)) &&
- !OP_SYMBOL(IC_RESULT(ic))->remat &&
- !IS_OP_RUONLY(IC_RIGHT(ic)) &&
- getSize(aggrToPtr(operandType(IC_RESULT(ic)),FALSE)) > 1 )
-
- packRegsForOneuse (ic,IC_RESULT(ic),ebp);
-
- /* if pointer get */
- if (POINTER_GET(ic) &&
- !isOperandInFarSpace(IC_RESULT(ic))&&
- !OP_SYMBOL(IC_LEFT(ic))->remat &&
- !IS_OP_RUONLY(IC_RESULT(ic)) &&
- getSize(aggrToPtr(operandType(IC_LEFT(ic)),FALSE)) > 1 )
-
- packRegsForOneuse (ic,IC_LEFT(ic),ebp);
-
-
- /* if this is cast for intergral promotion then
- check if only use of the definition of the
- operand being casted/ if yes then replace
- the result of that arithmetic operation with
- this result and get rid of the cast */
- if (ic->op == CAST) {
- link *fromType = operandType(IC_RIGHT(ic));
- link *toType = operandType(IC_LEFT(ic));
-
- if (IS_INTEGRAL(fromType) && IS_INTEGRAL(toType) &&
- getSize(fromType) != getSize(toType) &&
- SPEC_USIGN(fromType) == SPEC_USIGN(toType)) {
-
- iCode *dic = packRegsForOneuse(ic,IC_RIGHT(ic),ebp);
- if (dic) {
- if (IS_ARITHMETIC_OP(dic)) {
- IC_RESULT(dic) = IC_RESULT(ic);
- remiCodeFromeBBlock(ebp,ic);
- hTabDeleteItem (&iCodehTab,ic->key,ic,DELETE_ITEM,NULL);
- OP_DEFS(IC_RESULT(dic)) = bitVectSetBit(OP_DEFS(IC_RESULT(dic)),dic->key);
- ic = ic->prev;
- } else
- OP_SYMBOL(IC_RIGHT(ic))->ruonly = 0;
- }
- } else {
-
- /* if the type from and type to are the same
- then if this is the only use then packit */
- if (checkType(operandType(IC_RIGHT(ic)),
- operandType(IC_LEFT(ic))) == 1) {
- iCode *dic = packRegsForOneuse (ic,IC_RIGHT(ic),ebp);
- if (dic) {
- IC_RESULT(dic) = IC_RESULT(ic);
- remiCodeFromeBBlock(ebp,ic);
- hTabDeleteItem (&iCodehTab,ic->key,ic,DELETE_ITEM,NULL);
- OP_DEFS(IC_RESULT(dic)) = bitVectSetBit(OP_DEFS(IC_RESULT(dic)),dic->key);
- ic = ic->prev;
+
+ /* reduce for support function calls */
+ if (ic->supportRtn || ic->op == '+' || ic->op == '-')
+ packRegsForSupport (ic, ebp);
+
+ /* some cases the redundant moves can
+ can be eliminated for return statements */
+ if ((ic->op == RETURN || (ic->op == SEND && ic->argreg == 1)) &&
+ !isOperandInFarSpace (IC_LEFT (ic)) &&
+ options.model == MODEL_SMALL) {
+ packRegsForOneuse (ic, IC_LEFT (ic), ebp);
+ }
+
+ /* if pointer set & left has a size more than
+ one and right is not in far space */
+ if (POINTER_SET (ic) &&
+ !isOperandInFarSpace (IC_RIGHT (ic)) &&
+ !OP_SYMBOL (IC_RESULT (ic))->remat &&
+ !IS_OP_RUONLY (IC_RIGHT (ic)) &&
+ getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1)
+ packRegsForOneuse (ic, IC_RESULT (ic), ebp);
+
+ /* if pointer get */
+ if (POINTER_GET (ic) &&
+ IS_SYMOP (IC_LEFT (ic)) &&
+ !isOperandInFarSpace (IC_RESULT (ic)) &&
+ !OP_SYMBOL (IC_LEFT (ic))->remat &&
+ !IS_OP_RUONLY (IC_RESULT (ic)) &&
+ getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1)
+ packRegsForOneuse (ic, IC_LEFT (ic), ebp);
+
+
+ /* if this is cast for intergral promotion then
+ check if only use of the definition of the
+ operand being casted/ if yes then replace
+ the result of that arithmetic operation with
+ this result and get rid of the cast */
+ if (ic->op == CAST)
+ {
+ sym_link *fromType = operandType (IC_RIGHT (ic));
+ sym_link *toType = operandType (IC_LEFT (ic));
+
+ if (IS_INTEGRAL (fromType) && IS_INTEGRAL (toType) &&
+ getSize (fromType) != getSize (toType) &&
+ SPEC_USIGN (fromType) == SPEC_USIGN (toType))
+ {
+
+ iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
+ if (dic)
+ {
+ if (IS_ARITHMETIC_OP (dic))
+ {
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
+ ReplaceOpWithCheaperOp(&IC_RESULT (dic), IC_RESULT (ic));
+ remiCodeFromeBBlock (ebp, ic);
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
+ hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
+ OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
+ ic = ic->prev;
+ }
+ else
+ OP_SYMBOL (IC_RIGHT (ic))->ruonly = 0;
+ }
+ }
+ else
+ {
+
+ /* if the type from and type to are the same
+ then if this is the only use then packit */
+ if (compareType (operandType (IC_RIGHT (ic)),
+ operandType (IC_LEFT (ic))) == 1)
+ {
+ iCode *dic = packRegsForOneuse (ic, IC_RIGHT (ic), ebp);
+ if (dic)
+ {
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
+ ReplaceOpWithCheaperOp(&IC_RESULT (dic), IC_RESULT (ic));
+ remiCodeFromeBBlock (ebp, ic);
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
+ hTabDeleteItem (&iCodehTab, ic->key, ic, DELETE_ITEM, NULL);
+ OP_DEFS(IC_RESULT (dic))=bitVectSetBit (OP_DEFS (IC_RESULT (dic)), dic->key);
+ ic = ic->prev;
}
}
}
}
-
- /* pack for PUSH
- iTempNN := (some variable in farspace) V1
- push iTempNN ;
- -------------
- push V1
- */
- if (ic->op == IPUSH ) {
- packForPush(ic,ebp);
+
+ /* pack for PUSH
+ iTempNN := (some variable in farspace) V1
+ push iTempNN ;
+ -------------
+ push V1
+ */
+ if (ic->op == IPUSH)
+ {
+ packForPush (ic, ebpp, blockno);
}
-
-
- /* pack registers for accumulator use, when the
- result of an arithmetic or bit wise operation
- has only one use, that use is immediately following
- the defintion and the using iCode has only one
- operand or has two operands but one is literal &
- the result of that operation is not on stack then
- we can leave the result of this operation in acc:b
- combination */
- if ((IS_ARITHMETIC_OP(ic)
- || IS_BITWISE_OP(ic)
- || ic->op == LEFT_OP || ic->op == RIGHT_OP
- || (ic->op == ADDRESS_OF && isOperandOnStack(IC_LEFT(ic)))
- ) &&
- IS_ITEMP(IC_RESULT(ic)) &&
- getSize(operandType(IC_RESULT(ic))) <= 2)
-
- packRegsForAccUse (ic);
+
+ /* pack registers for accumulator use, when the
+ result of an arithmetic or bit wise operation
+ has only one use, that use is immediately following
+ the defintion and the using iCode has only one
+ operand or has two operands but one is literal &
+ the result of that operation is not on stack then
+ we can leave the result of this operation in acc:b
+ combination */
+ if ((IS_ARITHMETIC_OP (ic)
+ || IS_CONDITIONAL(ic)
+ || IS_BITWISE_OP (ic)
+ || ic->op == LEFT_OP || ic->op == RIGHT_OP || ic->op == CALL
+ || (ic->op == ADDRESS_OF && isOperandOnStack (IC_LEFT (ic)))
+ ) &&
+ IS_ITEMP (IC_RESULT (ic)) &&
+ getSize (operandType (IC_RESULT (ic))) <= 2)
+
+ packRegsForAccUse (ic);
}
}
-
+
/*-----------------------------------------------------------------*/
/* assignRegisters - assigns registers to each live range as need */
/*-----------------------------------------------------------------*/
-void mcs51_assignRegisters (eBBlock **ebbs, int count)
+void
+mcs51_assignRegisters (eBBlock ** ebbs, int count)
{
- iCode *ic;
- int i ;
-
- setToNull((void *)&_G.funcrUsed);
- mcs51_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
- /* if not register extentions then reduce number
- of registers */
- if (options.regExtend)
- mcs51_nRegs = 13;
- else
- mcs51_nRegs = 8;
-
- /* change assignments this will remove some
- live ranges reducing some register pressure */
- for (i = 0 ; i < count ;i++ )
- packRegisters (ebbs[i]);
-
- if (options.dump_pack)
- dumpEbbsToFileExt(".dumppack",ebbs,count);
+ iCode *ic;
+ int i;
- /* first determine for each live range the number of
- registers & the type of registers required for each */
- regTypeNum ();
-
- /* and serially allocate registers */
- serialRegAssign(ebbs,count);
-
- /* if stack was extended then tell the user */
- if (_G.stackExtend) {
-/* werror(W_TOOMANY_SPILS,"stack", */
-/* _G.stackExtend,currFunc->name,""); */
- _G.stackExtend = 0 ;
- }
+ setToNull ((void *) &_G.funcrUsed);
+ //setToNull ((void *) &_G.regAssigned);
+ setToNull ((void *) &_G.totRegAssigned);
+ mcs51_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
+ mcs51_nRegs = 8;
+
+ /* change assignments this will remove some
+ live ranges reducing some register pressure */
+ for (i = 0; i < count; i++)
+ packRegisters (ebbs, i);
+
+ if (options.dump_pack)
+ dumpEbbsToFileExt (DUMP_PACK, ebbs, count);
- if (_G.dataExtend) {
-/* werror(W_TOOMANY_SPILS,"data space", */
-/* _G.dataExtend,currFunc->name,""); */
- _G.dataExtend = 0 ;
- }
+ /* first determine for each live range the number of
+ registers & the type of registers required for each */
+ regTypeNum (*ebbs);
- /* after that create the register mask
- for each of the instruction */
- createRegMask (ebbs,count);
+ /* and serially allocate registers */
+ serialRegAssign (ebbs, count);
- /* redo that offsets for stacked automatic variables */
- redoStackOffsets ();
+ freeAllRegs ();
+ //setToNull ((void *) &_G.regAssigned);
+ //setToNull ((void *) &_G.totRegAssigned);
+ fillGaps();
- if (options.dump_rassgn) {
- dumpEbbsToFileExt(".dumprassgn",ebbs,count);
- dumpLiveRanges(".lrange",liveRanges);
+ /* if stack was extended then tell the user */
+ if (_G.stackExtend)
+ {
+/* werror(W_TOOMANY_SPILS,"stack", */
+/* _G.stackExtend,currFunc->name,""); */
+ _G.stackExtend = 0;
}
- /* do the overlaysegment stuff SDCCmem.c */
- doOverlays(ebbs,count);
+ if (_G.dataExtend)
+ {
+/* werror(W_TOOMANY_SPILS,"data space", */
+/* _G.dataExtend,currFunc->name,""); */
+ _G.dataExtend = 0;
+ }
+
+ /* after that create the register mask
+ for each of the instruction */
+ createRegMask (ebbs, count);
+
+ /* redo that offsets for stacked automatic variables */
+ redoStackOffsets ();
+
+ if (options.dump_rassgn)
+ {
+ dumpEbbsToFileExt (DUMP_RASSGN, ebbs, count);
+ dumpLiveRanges (DUMP_LRANGE, liveRanges);
+ }
- /* now get back the chain */
- ic = iCodeLabelOptimize(iCodeFromeBBlock (ebbs,count));
+ /* do the overlaysegment stuff SDCCmem.c */
+ doOverlays (ebbs, count);
+ /* now get back the chain */
+ ic = iCodeLabelOptimize (iCodeFromeBBlock (ebbs, count));
- gen51Code(ic);
+ gen51Code (ic);
- /* free up any _G.stackSpil locations allocated */
- applyToSet(_G.stackSpil,deallocStackSpil);
- _G.slocNum = 0;
- setToNull((void **)&_G.stackSpil);
- setToNull((void **)&_G.spiltSet);
- /* mark all registers as free */
- freeAllRegs();
+ /* free up any _G.stackSpil locations allocated */
+ applyToSet (_G.stackSpil, deallocStackSpil);
+ _G.slocNum = 0;
+ setToNull ((void **) &_G.stackSpil);
+ setToNull ((void **) &_G.spiltSet);
+ /* mark all registers as free */
+ freeAllRegs ();
- return ;
+ return;
}
projects / fw / sdcc / blobdiff