/* since the pack the registers depending strictly on the MCU */
/*-----------------------------------------------------------------*/
+#define D(x)
+
/* Global data */
static struct
{
{REG_GPR, R7_IDX, REG_GPR, "r7", "ar7", "0", 7, 1, 1},
{REG_PTR, R0_IDX, REG_PTR, "r0", "ar0", "0", 0, 1, 1},
{REG_PTR, R1_IDX, REG_PTR, "r1", "ar1", "0", 1, 1, 1},
+ {REG_GPR, DPL_IDX, REG_GPR, "dpl", "dpl", "dpl", 0, 0, 0},
+ {REG_GPR, DPH_IDX, REG_GPR, "dph", "dph", "dph", 0, 0, 0},
+ {REG_GPR, DPX_IDX, REG_GPR, "dpx", "dpx", "dpx", 0, 0, 0},
+ {REG_GPR, B_IDX, REG_GPR, "b", "b", "b", 0, 0, 0},
{REG_GPR, X8_IDX, REG_GPR, "x8", "x8", "xreg", 0, 0, 0},
{REG_GPR, X9_IDX, REG_GPR, "x9", "x9", "xreg", 1, 0, 0},
{REG_GPR, X10_IDX, REG_GPR, "x10", "x10", "xreg", 2, 0, 0},
{REG_GPR, X11_IDX, REG_GPR, "x11", "x11", "xreg", 3, 0, 0},
{REG_GPR, X12_IDX, REG_GPR, "x12", "x12", "xreg", 4, 0, 0},
{REG_CND, CND_IDX, REG_GPR, "C", "C", "xreg", 0, 0, 0},
- {REG_GPR, DPL_IDX, REG_GPR, "dpl", "dpl", "dpl", 0, 0, 0},
- {REG_GPR, DPH_IDX, REG_GPR, "dph", "dph", "dph", 0, 0, 0},
- {REG_GPR, DPX_IDX, REG_GPR, "dpx", "dpx", "dpx", 0, 0, 0},
- {REG_GPR, B_IDX, REG_GPR, "b", "b", "b", 0, 0, 0},
};
int ds390_nRegs = 13;
static void spillThis (symbol *);
static void freeAllRegs ();
+static iCode * packRegsDPTRuse (operand *);
+static int packRegsDPTRnuse (operand *,int);
/*-----------------------------------------------------------------*/
/* allocReg - allocates register of given type */
return TRUE;
}
+/*-----------------------------------------------------------------*/
+/* isOperandInReg - returns true if operand is currently in regs */
+/*-----------------------------------------------------------------*/
+static int isOperandInReg(operand *op)
+{
+ if (!IS_SYMOP(op)) return 0;
+ if (OP_SYMBOL(op)->ruonly) return 1;
+ if (OP_SYMBOL(op)->accuse) return 1;
+ if (OP_SYMBOL(op)->dptr) return 1;
+ return bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(op)->key);
+}
+
/*-----------------------------------------------------------------*/
/* computeSpillable - given a point find the spillable live ranges */
/*-----------------------------------------------------------------*/
notUsedInBlock (symbol * sym, eBBlock * ebp, iCode * ic)
{
return (!bitVectBitsInCommon (sym->defs, ebp->usesDefs) &&
- allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq));
+ allDefsOutOfRange (sym->defs, ebp->fSeq, ebp->lSeq) &&
+ allDefsOutOfRange (sym->uses, ebp->fSeq, ebp->lSeq));
/* return (!bitVectBitsInCommon(sym->defs,ebp->usesDefs)); */
}
}
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
(ebbs[i]->entryLabel != entryLabel &&
ebbs[i]->entryLabel != returnLabel))
continue;
-
+
+/* if (returnsAtEnd(ebbs[i])) */
+
/* of all instructions do */
for (ic = ebbs[i]->sch; ic; ic = ic->next)
{
{
symbol *sym =NULL;
int key =0;
-
- if (getenv("DISABLE_FILL_GAPS")) return;
- /* look for livernages that was spilt by the allocator */
- for (sym = hTabFirstItem(liveRanges,&key) ; sym ;
- sym = hTabNextItem(liveRanges,&key)) {
+ int loop = 0, change;
- int i;
- int pdone = 0;
+ if (getenv("DISABLE_FILL_GAPS")) return;
+
+ /* First try to do DPTRuse once more since now we know what got into
+ registers */
+
+ while (loop++ < 10) {
+ change = 0;
+
+ for (sym = hTabFirstItem(liveRanges,&key) ; sym ;
+ sym = hTabNextItem(liveRanges,&key)) {
+ int size = getSize(sym->type);
+
+ if (sym->liveFrom == sym->liveTo) continue;
+
+ if (sym->uptr && sym->dptr==0 && !sym->ruonly &&
+ size < 4 && size > 1) {
+
+ if (packRegsDPTRuse(operandFromSymbol(sym))) {
+
+ /* if this was ssigned to registers then */
+ if (bitVectBitValue(_G.totRegAssigned,sym->key)) {
+ /* take it out of the register assigned set */
+ bitVectUnSetBit(_G.totRegAssigned,sym->key);
+ } else if (sym->usl.spillLoc) {
+ sym->usl.spillLoc->allocreq--;
+ sym->usl.spillLoc = NULL;
+ }
+
+ sym->nRegs = 0;
+ sym->isspilt = sym->spillA = 0;
+ continue ;
+ }
- if (!sym->spillA || !sym->clashes || sym->remat) continue ;
+ /* try assigning other dptrs */
+ if (sym->dptr == 0 && packRegsDPTRnuse(operandFromSymbol(sym),1) && !getenv("DPTRnDISABLE")) {
+ /* if this was ssigned to registers then */
+ if (bitVectBitValue(_G.totRegAssigned,sym->key)) {
+ /* take it out of the register assigned set */
+ bitVectUnSetBit(_G.totRegAssigned,sym->key);
+ } else if (sym->usl.spillLoc) {
+ sym->usl.spillLoc->allocreq--;
+ sym->usl.spillLoc = NULL;
+ }
+/* printf("Allocated %s in function %s to DPTR1\n",sym->name,currFunc->name); */
+ sym->nRegs = 0;
+ sym->isspilt = sym->spillA = 0;
+ }
+ }
+ }
- /* 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;
-
- if (bitVectBitValue(sym->clashes,i) == 0 || /* those that clash with this */
- bitVectBitValue(_G.totRegAssigned,i) == 0) /* and are still assigned to registers */
+ /* look for livernages that was spilt by the allocator */
+ for (sym = hTabFirstItem(liveRanges,&key) ; sym ;
+ sym = hTabNextItem(liveRanges,&key)) {
+
+ int i;
+ int pdone = 0;
+
+ if (!sym->spillA || !sym->clashes || sym->remat) continue ;
+ if (!sym->uses || !sym->defs) continue ;
+ /* 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;
+
+ if (bitVectBitValue(sym->clashes,i) == 0 || /* those that clash with this */
+ bitVectBitValue(_G.totRegAssigned,i) == 0) /* and are still assigned to registers */
+ continue ;
+
+ assert (clr = hTabItemWithKey(liveRanges,i));
+
+ /* mark these registers as used */
+ for (k = 0 ; k < clr->nRegs ; k++ )
+ useReg(clr->regs[k]);
+ }
+
+ if (willCauseSpill(sym->nRegs,sym->regType)) {
+ /* NOPE :( clear all registers & and continue */
+ freeAllRegs();
continue ;
-
- assert (clr = hTabItemWithKey(liveRanges,i));
-
- /* mark these registers as used */
- for (k = 0 ; k < clr->nRegs ; k++ )
- useReg(clr->regs[k]);
- }
-
- if (willCauseSpill(sym->nRegs,sym->regType)) {
- /* NOPE :( clear all registers & and continue */
- freeAllRegs();
- continue ;
- }
-
- /* THERE IS HOPE !!!! */
- for (i=0; i < sym->nRegs ; i++ ) {
- if (sym->regType == REG_PTR)
- sym->regs[i] = getRegPtrNoSpil ();
- else
- sym->regs[i] = getRegGprNoSpil ();
- }
-
- /* 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)));
+ }
+
+ /* THERE IS HOPE !!!! */
+ for (i=0; i < sym->nRegs ; i++ ) {
+ if (sym->regType == REG_PTR)
+ sym->regs[i] = getRegPtrNoSpil ();
+ else
+ sym->regs[i] = getRegGprNoSpil ();
+ }
+
+ /* for all its definitions & uses 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;
}
- if (IS_SYMOP(IC_RIGHT(ic)) &&
- bitVectBitValue(_G.totRegAssigned,OP_SYMBOL(IC_RIGHT(ic))->key)) {
- pdone += positionRegs(sym,OP_SYMBOL(IC_RIGHT(ic)));
+ }
+ 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;
}
- 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 = 0;
- for (i=0; i < sym->nRegs ; i++ ) {
- sym->regs[i] = NULL;
+ /* 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 (fprintf (stderr, "Fill Gap gave up due to positioning for "
+ "%s in function %s\n",
+ sym->name, currFunc ? currFunc->name : "UNKNOWN"));
+ continue ;
}
+ D (fprintf (stderr, "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--;
+ sym->usl.spillLoc = NULL;
freeAllRegs();
- printf("Fill Gap gave up due to positioning for %s in function %s\n",sym->name, currFunc ? currFunc->name : "UNKNOWN");
- continue ;
+ change ++;
}
- 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();
+ if (!change) break;
}
}
/*-----------------------------------------------------------------*/
/* rUmaskForOp :- returns register mask for an operand */
/*-----------------------------------------------------------------*/
-static bitVect *
-rUmaskForOp (operand * op)
+bitVect *
+ds390_rUmaskForOp (operand * op)
{
bitVect *rumask;
symbol *sym;
if (ic->op == IFX)
{
rmask = bitVectUnion (rmask,
- rUmaskForOp (IC_COND (ic)));
+ ds390_rUmaskForOp (IC_COND (ic)));
goto ret;
}
if (ic->op == JUMPTABLE)
{
rmask = bitVectUnion (rmask,
- rUmaskForOp (IC_JTCOND (ic)));
+ ds390_rUmaskForOp (IC_JTCOND (ic)));
goto ret;
}
/* of all other cases */
if (IC_LEFT (ic))
rmask = bitVectUnion (rmask,
- rUmaskForOp (IC_LEFT (ic)));
+ ds390_rUmaskForOp (IC_LEFT (ic)));
if (IC_RIGHT (ic))
rmask = bitVectUnion (rmask,
- rUmaskForOp (IC_RIGHT (ic)));
+ ds390_rUmaskForOp (IC_RIGHT (ic)));
if (IC_RESULT (ic))
rmask = bitVectUnion (rmask,
- rUmaskForOp (IC_RESULT (ic)));
+ ds390_rUmaskForOp (IC_RESULT (ic)));
ret:
return rmask;
}
/* 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 */
-
+ that definition is a get_pointer */
if (bitVectnBitsOn (sym->defs) == 1 &&
(ic = hTabItemWithKey (iCodehTab,
bitVectFirstBit (sym->defs))) &&
!sym->noSpilLoc &&
!IS_BITVAR (sym->etype))
{
-
-
- /* if remat in data space */
+ /* and that pointer is remat in data space */
if (OP_SYMBOL (IC_LEFT (ic))->remat &&
!IS_CAST_ICODE(OP_SYMBOL (IC_LEFT (ic))->rematiCode) &&
- DCL_TYPE (aggrToPtr (sym->type, FALSE)) == POINTER)
+ DCL_TYPE (aggrToPtr (operandType(IC_LEFT(ic)), FALSE)) == POINTER)
{
/* create a psuedo symbol & force a spil */
/* 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);
+
IC_RESULT (dic) = IC_RESULT (ic);
if (IS_ITEMP (IC_RESULT (dic)) && OP_SYMBOL (IC_RESULT (dic))->liveFrom > dic->seq)
}
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;
/*-----------------------------------------------------------------*/
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 */
/* found it we need to remove it from the
block */
- for (sic = dic; sic != ic; sic = sic->next)
+ for (sic = dic; sic != ic; sic = sic->next) {
bitVectUnSetBit (sic->rlive, IC_LEFT (ic)->key);
+ sic->rlive = bitVectSetBit (sic->rlive, IC_RIGHT (dic)->key);
+ }
IC_LEFT (ic)->operand.symOperand =
IC_RIGHT (dic)->operand.symOperand;
+ OP_SYMBOL(IC_LEFT(ic))->liveTo = ic->seq;
IC_LEFT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
remiCodeFromeBBlock (ebp, dic);
hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
change++;
}
/* found it we need to remove it from the
block */
- for (sic = dic; sic != ic; sic = sic->next)
+ for (sic = dic; sic != ic; sic = sic->next) {
bitVectUnSetBit (sic->rlive, IC_RIGHT (ic)->key);
+ sic->rlive = bitVectSetBit (sic->rlive, IC_RIGHT (dic)->key);
+ }
IC_RIGHT (ic)->operand.symOperand =
IC_RIGHT (dic)->operand.symOperand;
IC_RIGHT (ic)->key = IC_RIGHT (dic)->operand.symOperand->key;
-
+ OP_SYMBOL(IC_RIGHT(ic))->liveTo = ic->seq;
remiCodeFromeBBlock (ebp, dic);
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
change++;
}
#define IS_OP_RUONLY(x) (x && IS_SYMOP(x) && OP_SYMBOL(x)->ruonly)
+/*-----------------------------------------------------------------*/
+/* packRegsDPTRnuse - color live ranges that can go into extra DPTRS */
+/*-----------------------------------------------------------------*/
+static int packRegsDPTRnuse( operand *op , int dptr)
+{
+ int i,key;
+ iCode *ic;
+
+ if (!IS_SYMOP(op) || !IS_ITEMP(op)) return 0;
+ if (OP_SYMBOL(op)->remat || OP_SYMBOL(op)->ruonly || OP_SYMBOL(op)->dptr)
+ return 0;
+
+ /* first check if any overlapping liverange has already been
+ assigned to this DPTR */
+ if (OP_SYMBOL(op)->clashes) {
+ for (i = 0 ; i < OP_SYMBOL(op)->clashes->size ; i++ ) {
+ symbol *sym;
+ if (bitVectBitValue(OP_SYMBOL(op)->clashes,i)) {
+ sym = hTabItemWithKey(liveRanges,i);
+ if (sym->dptr == dptr) return 0;
+ }
+ }
+ }
+
+ /* future for more dptrs */
+ if (dptr > 1) {
+ OP_SYMBOL(op)->dptr = dptr;
+ return 1;
+ }
+
+ /* DPTR1 is special since it is also used as a scratch by the backend .
+ so we walk thru the entire live range of this operand and make sure
+ DPTR1 will not be used by the backed . The logic here is to find out if
+ more than one operand in an icode is in far space then we give up : we
+ don't keep it live across functions for now
+ */
+
+ ic = hTabFirstItemWK(iCodeSeqhTab,OP_SYMBOL(op)->liveFrom);
+ for (; ic && ic->seq <= OP_SYMBOL(op)->liveTo;
+ ic = hTabNextItem(iCodeSeqhTab,&key)) {
+ int nfs =0;
+
+ if (ic->op == CALL || ic->op == PCALL) return 0;
+
+ /* single operand icode are ok */
+ if (ic->op == IFX || ic->op == IPUSH)
+ continue ;
+
+ if (ic->op == SEND ) {
+ if (ic->argreg != 1) return 0;
+ else continue ;
+ }
+ /* two special cases first */
+ if (POINTER_GET(ic) && !isOperandEqual(IC_LEFT(ic),op) && /* pointer get */
+ !OP_SYMBOL(IC_LEFT(ic))->ruonly && /* with result in far space */
+ (isOperandInFarSpace(IC_RESULT(ic)) &&
+ !isOperandInReg(IC_RESULT(ic)))) {
+ return 0;
+ }
+
+ if (POINTER_SET(ic) && !isOperandEqual(IC_RESULT(ic),op) && /* pointer set */
+ !OP_SYMBOL(IC_RESULT(ic))->ruonly && /* with right in far space */
+ (isOperandInFarSpace(IC_RIGHT(ic)) &&
+ !isOperandInReg(IC_RIGHT(ic)))) {
+ return 0;
+ }
+
+ if (IC_RESULT(ic) && IS_SYMOP(IC_RESULT(ic)) && /* if symbol operand */
+ !isOperandEqual(IC_RESULT(ic),op) && /* not the same as this */
+ ((isOperandInFarSpace(IC_RESULT(ic)) || /* in farspace or */
+ OP_SYMBOL(IC_RESULT(ic))->onStack) && /* on the stack */
+ !isOperandInReg(IC_RESULT(ic)))) { /* and not in register */
+ nfs++;
+ }
+ /* same for left */
+ if (IC_LEFT(ic) && IS_SYMOP(IC_LEFT(ic)) && /* if symbol operand */
+ !isOperandEqual(IC_LEFT(ic),op) && /* not the same as this */
+ ((isOperandInFarSpace(IC_LEFT(ic)) || /* in farspace or */
+ OP_SYMBOL(IC_LEFT(ic))->onStack) && /* on the stack */
+ !isOperandInReg(IC_LEFT(ic)))) { /* and not in register */
+ nfs++;
+ }
+ /* same for right */
+ if (IC_RIGHT(ic) && IS_SYMOP(IC_RIGHT(ic)) && /* if symbol operand */
+ !isOperandEqual(IC_RIGHT(ic),op) && /* not the same as this */
+ ((isOperandInFarSpace(IC_RIGHT(ic)) || /* in farspace or */
+ OP_SYMBOL(IC_RIGHT(ic))->onStack) && /* on the stack */
+ !isOperandInReg(IC_RIGHT(ic)))) { /* and not in register */
+ nfs++;
+ }
+
+ if (nfs > 1) return 0;
+ }
+ OP_SYMBOL(op)->dptr = dptr;
+ return 1;
+}
+
/*-----------------------------------------------------------------*/
/* packRegsDPTRuse : - will reduce some registers for single Use */
/*-----------------------------------------------------------------*/
static iCode *
-packRegsDPTRuse (iCode * lic, operand * op, eBBlock * ebp)
+packRegsDPTRuse (operand * op)
{
/* go thru entire liveRange of this variable & check for
other possible usage of DPTR , if we don't find it the
for (; ic && ic->seq <= OP_SYMBOL(op)->liveTo;
ic = hTabNextItem(iCodeSeqhTab,&key)) {
+ if (SKIP_IC3(ic)) continue;
+
/* if PCALL cannot be sure give up */
if (ic->op == PCALL) return NULL;
- /* if CALL then make sure it is VOID || return value not used */
+ /* if SEND & not the first parameter then giveup */
+ if (ic->op == SEND && ic->argreg != 1) return NULL;
+
+ /* if CALL then make sure it is VOID || return value not used
+ or the return value is assigned to this one */
if (ic->op == CALL) {
if (OP_SYMBOL(IC_RESULT(ic))->liveTo ==
OP_SYMBOL(IC_RESULT(ic))->liveFrom) continue ;
etype = getSpec(type = operandType(IC_RESULT(ic)));
- if (getSize(type) == 0) continue ;
+ if (getSize(type) == 0 || isOperandEqual(op,IC_RESULT(ic)))
+ continue ;
return NULL ;
}
/* special case of add with a [remat] */
if (ic->op == '+' &&
OP_SYMBOL(IC_LEFT(ic))->remat &&
- !isOperandInFarSpace(IC_RIGHT(ic))) continue ;
+ (isOperandInFarSpace(IC_RIGHT(ic)) &&
+ !isOperandInReg(IC_RIGHT(ic)))) return NULL ;
- /* special case */
+ /* special cases */
/* pointerGet */
- if (POINTER_GET(ic) && isOperandEqual(IC_RESULT(ic),op) &&
- getSize(operandType(IC_LEFT(ic))) > 1) return NULL ;
-
- if (POINTER_SET(ic) && isOperandEqual(IC_RIGHT(ic),op) &&
- getSize(operandType(IC_RESULT(ic))) > 1) return NULL;
+ if (POINTER_GET(ic) && !isOperandEqual(IC_LEFT(ic),op) &&
+ getSize(operandType(IC_LEFT(ic))) > 1 ) return NULL ;
+
+ /* pointerSet */
+ if (POINTER_SET(ic) && !isOperandEqual(IC_RESULT(ic),op) &&
+ getSize(operandType(IC_RESULT(ic))) > 1 ) return NULL;
+
+ /* conditionals can destroy 'b' - make sure B wont
+ be used in this one*/
+ if ((IS_CONDITIONAL(ic) || ic->op == '*' || ic->op == '/' ||
+ ic->op == LEFT_OP || ic->op == RIGHT_OP ) &&
+ getSize(operandType(op)) > 3) return NULL;
+
+ /* if this is a cast to a bigger type */
+ if (ic->op==CAST) {
+ if (!IS_PTR(OP_SYM_TYPE(IC_RESULT(ic))) &&
+ getSize(OP_SYM_TYPE(IC_RESULT(ic))) >
+ getSize(OP_SYM_TYPE(IC_RIGHT(ic)))) {
+ return 0;
+ }
+ }
/* general case */
if (IC_RESULT(ic) && IS_SYMOP(IC_RESULT(ic)) &&
!isOperandEqual(IC_RESULT(ic),op) &&
- (isOperandInFarSpace(IC_RESULT(ic)) ||
- OP_SYMBOL(IC_RESULT(ic))->ruonly ||
- OP_SYMBOL(IC_RESULT(ic))->onStack)) return NULL;
+ ( ( ( isOperandInFarSpace(IC_RESULT(ic)) || OP_SYMBOL(IC_RESULT(ic))->onStack) &&
+ !isOperandInReg(IC_RESULT(ic))) ||
+ OP_SYMBOL(IC_RESULT(ic))->ruonly)) return NULL;
if (IC_RIGHT(ic) && IS_SYMOP(IC_RIGHT(ic)) &&
!isOperandEqual(IC_RIGHT(ic),op) &&
- (OP_SYMBOL(IC_RIGHT(ic))->liveTo > ic->seq ||
+ (OP_SYMBOL(IC_RIGHT(ic))->liveTo >= ic->seq ||
IS_TRUE_SYMOP(IC_RIGHT(ic)) ||
OP_SYMBOL(IC_RIGHT(ic))->ruonly) &&
- (isOperandInFarSpace(IC_RIGHT(ic)) ||
- OP_SYMBOL(IC_RIGHT(ic))->onStack)) return NULL;
+ ( ( isOperandInFarSpace(IC_RIGHT(ic)) || OP_SYMBOL(IC_RIGHT(ic))->onStack) &&
+ !isOperandInReg(IC_RIGHT(ic))) ) return NULL;
if (IC_LEFT(ic) && IS_SYMOP(IC_LEFT(ic)) &&
!isOperandEqual(IC_LEFT(ic),op) &&
(OP_SYMBOL(IC_LEFT(ic))->liveTo > ic->seq ||
IS_TRUE_SYMOP(IC_LEFT(ic)) ||
OP_SYMBOL(IC_LEFT(ic))->ruonly) &&
- (isOperandInFarSpace(IC_LEFT(ic)) ||
- OP_SYMBOL(IC_LEFT(ic))->onStack)) return NULL;
+ ( ( isOperandInFarSpace(IC_LEFT(ic)) || OP_SYMBOL(IC_LEFT(ic))->onStack) &&
+ !isOperandInReg(IC_LEFT(ic))) ) return NULL;
if (IC_LEFT(ic) && IC_RIGHT(ic) &&
IS_ITEMP(IC_LEFT(ic)) && IS_ITEMP(IC_RIGHT(ic)) &&
- isOperandInFarSpace(IC_LEFT(ic)) && isOperandInFarSpace(IC_RIGHT(ic)))
+ (isOperandInFarSpace(IC_LEFT(ic)) && !isOperandInReg(IC_LEFT(ic))) &&
+ (isOperandInFarSpace(IC_RIGHT(ic)) && !isOperandInReg(IC_RIGHT(ic))))
return NULL;
}
OP_SYMBOL(op)->ruonly = 1;
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)
/* 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)
+ if (isOperandOnStack(IC_RESULT(uic)))
return;
/* if either one of them in far space then we cannot */
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
-
/* 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)) ||
iCode *dic, *lic;
bitVect *dbv;
- if (ic->op != IPUSH || !IS_ITEMP (IC_LEFT (ic)))
+ if ((ic->op != IPUSH && ic->op != SEND) || !IS_ITEMP (IC_LEFT (ic)))
return;
/* must have only definition & one usage */
if (OP_SYMBOL(IC_RIGHT(dic))->liveTo < ic->seq) {
OP_SYMBOL(IC_RIGHT(dic))->liveTo = ic->seq;
}
+ for (lic = ic; lic && lic != dic; lic = lic->prev)
+ {
+ bitVectUnSetBit (lic->rlive, IC_LEFT (ic)->key);
+ if (IS_ITEMP (IC_RIGHT (dic)))
+ bitVectSetBit (lic->rlive, IC_RIGHT (dic)->key);
+ }
/* 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);
remiCodeFromeBBlock (ebp, dic);
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
hTabDeleteItem (&iCodehTab, dic->key, dic, DELETE_ITEM, NULL);
}
}
+ /* if this is an itemp & used as a pointer
+ & assigned to a literal then remat */
+ if (IS_ASSIGN_ICODE(ic) &&
+ IS_ITEMP(IC_RESULT(ic)) &&
+ bitVectnBitsOn (OP_DEFS (IC_RESULT (ic))) == 1 &&
+ isOperandLiteral(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 straight assignment then carry remat flag if
this is the only definition */
if (ic->op == '=' &&
cast is remat, then we can remat this cast as well */
if (ic->op == CAST &&
IS_SYMOP(IC_RIGHT(ic)) &&
+ !OP_SYMBOL(IC_RESULT(ic))->isreqv &&
OP_SYMBOL(IC_RIGHT(ic))->remat ) {
sym_link *to_type = operandType(IC_LEFT(ic));
sym_link *from_type = operandType(IC_RIGHT(ic));
if (POINTER_GET (ic))
OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
+ if (ic->op == RETURN && IS_SYMOP (IC_LEFT(ic)))
+ OP_SYMBOL (IC_LEFT (ic))->uptr = 1;
+
+ if (ic->op == RECEIVE && ic->argreg == 1 &&
+ getSize (operandType(IC_RESULT(ic))) <= 3)
+ OP_SYMBOL (IC_RESULT(ic))->uptr = 1;
+
if (!SKIP_IC2 (ic))
{
/* if we are using a symbol on the stack
}
}
-#if 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) ||
- (IS_BITWISE_OP(ic) && 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;
- }
-#else
/* if the condition of an if instruction
is defined in the previous instruction and
this is the only usage then
OP_SYMBOL (IC_RESULT (ic))->regType = REG_CND;
continue;
}
-#endif
-
+#if 1
/* reduce for support function calls */
if (ic->supportRtn || ic->op == '+' || ic->op == '-')
packRegsForSupport (ic, ebp);
-
+#endif
/* some cases the redundant moves can
- can be eliminated for return statements */
- if ((ic->op == RETURN || ic->op == SEND) &&
+ can be eliminated for return statements . Can be elminated for the first SEND */
+ if ((ic->op == RETURN ||
+ ((ic->op == SEND || ic->op == RECEIVE)&& ic->argreg == 1)) &&
!isOperandInFarSpace (IC_LEFT (ic)) &&
!options.model) {
- packRegsDPTRuse (ic, IC_LEFT (ic), ebp);
+ packRegsDPTRuse (IC_LEFT (ic));
}
- if ((ic->op == CALL && getSize(operandType(IC_RESULT(ic))) <= 4)) {
- packRegsDPTRuse (ic, IC_RESULT (ic), ebp);
+ if (ic->op == CALL) {
+ sym_link *ftype = operandType(IC_LEFT(ic));
+ if (getSize(operandType(IC_RESULT(ic))) <= 4 &&
+ !IFFUNC_ISBUILTIN(ftype)) {
+ packRegsDPTRuse (IC_RESULT (ic));
+ }
}
/* if pointer set & left has a size more than
!IS_OP_RUONLY (IC_RIGHT (ic)) &&
getSize (aggrToPtr (operandType (IC_RESULT (ic)), FALSE)) > 1) {
- packRegsDPTRuse (ic, IC_RESULT (ic), ebp);
+ packRegsDPTRuse (IC_RESULT (ic));
}
/* if pointer get */
!IS_OP_RUONLY (IC_RESULT (ic)) &&
getSize (aggrToPtr (operandType (IC_LEFT (ic)), FALSE)) > 1) {
- packRegsDPTRuse (ic, IC_LEFT (ic), ebp);
+ packRegsDPTRuse (IC_LEFT (ic));
}
/* if this is cast for intergral promotion then
SPEC_USIGN (fromType) == SPEC_USIGN (toType))
{
- iCode *dic = packRegsDPTRuse (ic, IC_RIGHT (ic), ebp);
+ iCode *dic = packRegsDPTRuse (IC_RIGHT (ic));
if (dic)
{
if (IS_ARITHMETIC_OP (dic))
{
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(dic))->defs,dic->key);
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;
if (compareType (operandType (IC_RIGHT (ic)),
operandType (IC_LEFT (ic))) == 1)
{
- iCode *dic = packRegsDPTRuse (ic, IC_RIGHT (ic), ebp);
+ iCode *dic = packRegsDPTRuse (IC_RIGHT (ic));
if (dic)
{
+ bitVectUnSetBit(OP_SYMBOL(IC_RESULT(ic))->defs,ic->key);
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;
-------------
push V1
*/
- if (ic->op == IPUSH)
+ if (ic->op == IPUSH || ic->op == SEND)
{
packForPush (ic, ebp);
}
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 == LEFT_OP || ic->op == RIGHT_OP
|| (ic->op == ADDRESS_OF && isOperandOnStack (IC_LEFT (ic)))
) &&
IS_ITEMP (IC_RESULT (ic)) &&
setToNull ((void *) &_G.totRegAssigned);
setToNull ((void *) &_G.funcrUsed);
ds390_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
- ds390_nRegs = 18;
+ ds390_nRegs = 12;
if (options.model != MODEL_FLAT24) options.stack10bit = 0;
/* change assignments this will remove some
live ranges reducing some register pressure */
ds390_nRegs = 8;
freeAllRegs ();
fillGaps();
- ds390_nRegs = 18;
+ ds390_nRegs = 12;
/* if stack was extended then tell the user */
if (_G.stackExtend)
projects / fw / sdcc / blobdiff