cseDef *cdp;
assert (sym);
- cdp = Safe_calloc (1, sizeof (cseDef));
+ cdp = Safe_alloc (sizeof (cseDef));
cdp->sym = sym;
cdp->diCode = ic;
return 1;
}
+void ReplaceOpWithCheaperOp(operand **op, operand *cop) {
+#ifdef RANGEHUNT
+ printf ("ReplaceOpWithCheaperOp %s with %s: ",
+ IS_SYMOP((*op)) ? OP_SYMBOL((*op))->name : "!SYM",
+ IS_SYMOP(cop) ? OP_SYMBOL(cop)->name : "!SYM");
+ // if op is a register equivalent
+ if (IS_ITEMP(cop) && OP_SYMBOL((*op))->isreqv) {
+ operand **rop = &OP_SYMBOL((*op))->usl.spillLoc->reqv;
+ if (isOperandEqual(*rop, *op)) {
+ printf ("true");
+ *rop=cop;
+ OP_SYMBOL((*op))->isreqv=0;
+ OP_SYMBOL(cop)->isreqv=1;
+ } else {
+ printf ("false");
+ }
+ }
+ printf ("\n");
+#endif
+ *op=cop;
+}
+
/*-----------------------------------------------------------------*/
/* replaceAllSymBySym - replaces all operands by operand in an */
/* instruction chain */
{
bitVectUnSetBit (OP_USES (from), lic->key);
- OP_USES (to) = bitVectSetBit (OP_USES (to), lic->key);
+ OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
siaddr = IC_COND (lic)->isaddr;
IC_COND (lic) = operandFromOperand (to);
IC_COND (lic)->isaddr = siaddr;
{
bitVectUnSetBit (OP_USES (from), lic->key);
- OP_USES (to) = bitVectSetBit (OP_USES (to), lic->key);
+ OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
siaddr = IC_COND (lic)->isaddr;
IC_JTCOND (lic) = operandFromOperand (to);
IC_JTCOND (lic)->isaddr = siaddr;
continue;
}
- if (IC_RESULT (lic) && IC_RESULT (lic)->key == from->key)
+ if (IS_SYMOP(to) &&
+ IC_RESULT (lic) && IC_RESULT (lic)->key == from->key)
{
/* maintain du chains */
if (POINTER_SET (lic))
{
bitVectUnSetBit (OP_USES (from), lic->key);
- OP_USES (to) = bitVectSetBit (OP_USES (to), lic->key);
+ OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
/* also check if the "from" was in the non-dominating
pointer sets and replace it with "to" in the bitVector */
else
{
bitVectUnSetBit (OP_DEFS (from), lic->key);
- OP_DEFS (to) = bitVectSetBit (OP_DEFS (to), lic->key);
+ OP_DEFS(to)=bitVectSetBit (OP_DEFS (to), lic->key);
}
siaddr = IC_RESULT (lic)->isaddr;
IC_RESULT (lic) = operandFromOperand (to);
IC_RIGHT (lic) && IC_RIGHT (lic)->key == from->key)
{
bitVectUnSetBit (OP_USES (from), lic->key);
- OP_USES (to) = bitVectSetBit (OP_USES (to), lic->key);
+ OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
siaddr = IC_RIGHT (lic)->isaddr;
IC_RIGHT (lic) = operandFromOperand (to);
IC_RIGHT (lic)->isaddr = siaddr;
IC_LEFT (lic) && IC_LEFT (lic)->key == from->key)
{
bitVectUnSetBit (OP_USES (from), lic->key);
- OP_USES (to) = bitVectSetBit (OP_USES (to), lic->key);
+ OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
siaddr = IC_LEFT (lic)->isaddr;
IC_LEFT (lic) = operandFromOperand (to);
IC_LEFT (lic)->isaddr = siaddr;
cseDef *cdp = item;
V_ARG (operand *, cop);
V_ARG (operand **, opp);
+ V_ARG (int, checkSign);
/* if we have already found it */
if (*opp)
/* if the result is volatile then return result */
if (IS_OP_VOLATILE (IC_RESULT (cdp->diCode)))
*opp = IC_RESULT (cdp->diCode);
- else
+ else
/* if this is a straight assignment and
left is a temp then prefer the temporary to the
true symbol */
take into consideration if right side
an induction variable
*/
-
-#if SomeOneUnderStandsThis
- /* This causes the bug:
-
- void test (unsigned u) {
- // the following cast is ignored
- for (; (int) u >= 0;)
- ++u;
- }
- }
-
- where casts are ignored */
-
if (!POINTER_SET (cdp->diCode) &&
IS_ITEMP (IC_RESULT (cdp->diCode)) &&
IS_ITEMP (IC_RIGHT (cdp->diCode)) &&
!OP_SYMBOL (IC_RIGHT (cdp->diCode))->isind &&
+ !OP_SYMBOL(IC_RIGHT (cdp->diCode))->isreqv &&
((!SPIL_LOC (IC_RIGHT (cdp->diCode)) &&
SPIL_LOC (IC_RESULT (cdp->diCode))) ||
(SPIL_LOC (IC_RESULT (cdp->diCode)) &&
*opp = IC_RESULT (cdp->diCode);
else
*opp = IC_RIGHT (cdp->diCode);
-#endif
}
}
else
IS_ITEMP (IC_RESULT (cdp->diCode)))
*opp = IC_RESULT (cdp->diCode);
- if (*opp)
- {
+ if ((*opp) &&
+ (isOperandLiteral(*opp) || !checkSign ||
+ (checkSign &&
+ IS_SPEC(operandType (cop)) && IS_SPEC(operandType (*opp)) &&
+ (SPEC_USIGN(operandType (cop))==SPEC_USIGN(operandType (*opp)) &&
+ (SPEC_LONG(operandType (cop))==SPEC_LONG(operandType (*opp)))))))
+ {
if ((isGlobalInNearSpace (cop) &&
!isOperandLiteral (*opp)) ||
*opp = operandFromOperand (*opp);
(*opp)->isaddr = cop->isaddr;
}
-
+
+ if (IS_SPEC(operandType (cop)) && IS_SPEC(operandType (*opp)) &&
+ SPEC_NOUN(operandType(cop)) != SPEC_NOUN(operandType(*opp)))
+ {
+ // special case: we can make an unsigned char literal
+ // into an int literal with no cost.
+ if (isOperandLiteral(*opp)
+ && SPEC_NOUN(operandType(*opp)) == V_CHAR
+ && SPEC_NOUN(operandType(cop)) == V_INT)
+ {
+ *opp = operandFromOperand (*opp);
+ SPEC_NOUN(operandType(*opp)) = V_INT;
+ }
+ else
+ {
+ // No clue...
+ *opp = NULL;
+ return 0;
+ }
+
+ }
+
return 1;
}
-
+ *opp=NULL;
return 0;
}
return 0;
}
+/*-------------------------------------------------------------------*/
+/* ifAssignedFromGlobal - if definition is an assignment from global */
+/*-------------------------------------------------------------------*/
+DEFSETFUNC (ifAssignedFromGlobal)
+{
+ cseDef *cdp = item;
+ iCode *dic=cdp->diCode;
+
+ if (dic->op=='=' && isOperandGlobal(IC_RIGHT(dic))) {
+ return 1;
+ }
+ return 0;
+}
+
/*-----------------------------------------------------------------*/
/* ifDefGlobal - if definition is global */
/*-----------------------------------------------------------------*/
}
+/*-----------------------------------------------------------------*/
+/* findBackwardDef - scan backwards to find deinition of operand */
+/*-----------------------------------------------------------------*/
+iCode *findBackwardDef(operand *op,iCode *ic)
+{
+ iCode *lic;
+
+ for (lic = ic; lic ; lic = lic->prev) {
+ if (IC_RESULT(lic) && isOperandEqual(op,IC_RESULT(lic)))
+ return lic;
+ }
+ return NULL;
+}
+
/*-----------------------------------------------------------------*/
/* algebraicOpts - does some algebraic optimizations */
/*-----------------------------------------------------------------*/
}
if (operandLitValue (IC_LEFT (ic)) == 1.0)
{
- ic->op = '=';
- IC_LEFT (ic) = NULL;
- SET_RESULT_RIGHT (ic);
+ /* '*' can have two unsigned chars as operands */
+ /* and an unsigned int as result. */
+ if (compareType (operandType (IC_RESULT (ic)),
+ operandType (IC_RIGHT (ic))) == 1)
+ {
+ ic->op = '=';
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ }
+ else
+ {
+ ic->op = CAST;
+ IC_LEFT (ic)->type = TYPE;
+ setOperandType (IC_LEFT (ic), operandType (IC_RESULT (ic)));
+ }
return;
}
}
if (operandLitValue (IC_RIGHT (ic)) == 1.0)
{
- ic->op = '=';
- IC_RIGHT (ic) = IC_LEFT (ic);
- IC_LEFT (ic) = NULL;
- SET_RESULT_RIGHT (ic);
+ /* '*' can have two unsigned chars as operands */
+ /* and an unsigned int as result. */
+ if (compareType (operandType (IC_RESULT (ic)),
+ operandType (IC_LEFT (ic))) == 1)
+ {
+ ic->op = '=';
+ IC_RIGHT (ic) = IC_LEFT (ic);
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ }
+ else
+ {
+ operand *op;
+
+ ic->op = CAST;
+ op = IC_RIGHT (ic);
+ IC_RIGHT (ic) = IC_LEFT (ic);
+ IC_LEFT (ic) = op;
+ IC_LEFT (ic)->type = TYPE;
+ setOperandType (IC_LEFT (ic), operandType (IC_RESULT (ic)));
+ }
return;
}
}
IC_LEFT (ic) = NULL;
IC_RESULT (ic) = operandFromOperand (IC_RESULT (ic));
IC_RESULT (ic)->isaddr = 0;
+ break;
}
/* if this is a division then check if right */
/* is one then change it to an assignment */
}
break;
case CAST:
- /* if this is a cast of a literal value */
- if (IS_OP_LITERAL (IC_RIGHT (ic)))
+ {
+ sym_link *otype = operandType(IC_RIGHT(ic));
+ sym_link *ctype = operandType(IC_LEFT(ic));
+ /* if this is a cast of a literal value */
+ if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
+ !(IS_GENPTR(ctype) && (IS_PTR(otype) && !IS_GENPTR(otype)))) {
+ ic->op = '=';
+ IC_RIGHT (ic) =
+ operandFromValue (valCastLiteral (operandType (IC_LEFT (ic)),
+ operandLitValue (IC_RIGHT (ic))));
+ IC_LEFT (ic) = NULL;
+ SET_ISADDR (IC_RESULT (ic), 0);
+ }
+ /* if casting to the same */
+ if (compareType (operandType (IC_RESULT (ic)),
+ operandType (IC_RIGHT (ic))) == 1) {
+ ic->op = '=';
+ IC_LEFT (ic) = NULL;
+ SET_ISADDR (IC_RESULT (ic), 0);
+ }
+ }
+ break;
+ case '!':
+ if (IS_OP_LITERAL (IC_LEFT (ic)))
{
ic->op = '=';
IC_RIGHT (ic) =
- operandFromValue (valCastLiteral (operandType (IC_LEFT (ic)),
- operandLitValue (IC_RIGHT (ic))));
+ (operandLitValue (IC_LEFT (ic)) == 0 ?
+ operandFromLit (1) : operandFromLit (0));
IC_LEFT (ic) = NULL;
SET_ISADDR (IC_RESULT (ic), 0);
}
- /* if casting to the same */
- if (checkType (operandType (IC_RESULT (ic)),
- operandType (IC_RIGHT (ic))) == 1)
+ break;
+ case BITWISEAND:
+ if (IS_OP_LITERAL (IC_LEFT (ic)))
+ {
+ /* if BITWISEAND then check if one of them is a zero */
+ /* if yes turn it into 0 assignment */
+ if (operandLitValue (IC_LEFT (ic)) == 0.0)
+ {
+ if (IS_OP_VOLATILE (IC_RIGHT (ic)))
+ return;
+ ic->op = '=';
+ IC_RIGHT (ic) = IC_LEFT (ic);
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ /* if BITWISEAND then check if one of them is 0xff... */
+ /* if yes turn it into assignment */
+ if (operandLitValue (IC_LEFT (ic)) == -1.0)
+ {
+ ic->op = '=';
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ }
+ if (IS_OP_LITERAL (IC_RIGHT (ic)))
+ {
+ /* if BITWISEAND then check if one of them is a zero */
+ /* if yes turn it into 0 assignment */
+ if (operandLitValue (IC_RIGHT (ic)) == 0.0)
+ {
+ if (IS_OP_VOLATILE (IC_LEFT (ic)))
+ return;
+ ic->op = '=';
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ /* if BITWISEAND then check if one of them is 0xff... */
+ /* if yes turn it into assignment */
+ if (operandLitValue (IC_RIGHT (ic)) == -1.0)
+ {
+ ic->op = '=';
+ IC_RIGHT (ic) = IC_LEFT (ic);
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ }
+ break;
+ case '|':
+ if (IS_OP_LITERAL (IC_LEFT (ic)))
+ {
+ /* if BITWISEOR then check if one of them is a zero */
+ /* if yes turn it into assignment */
+ if (operandLitValue (IC_LEFT (ic)) == 0.0)
+ {
+ ic->op = '=';
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ /* if BITWISEOR then check if one of them is 0xff... */
+ /* if yes turn it into 0xff... assignment */
+ if (operandLitValue (IC_LEFT (ic)) == -1.0)
+ {
+ ic->op = '=';
+ IC_RIGHT (ic) = IC_LEFT (ic);
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ }
+ if (IS_OP_LITERAL (IC_RIGHT (ic)))
+ {
+ /* if BITWISEOR then check if one of them is a zero */
+ /* if yes turn it into assignment */
+ if (operandLitValue (IC_RIGHT (ic)) == 0.0)
+ {
+ ic->op = '=';
+ IC_RIGHT (ic) = IC_LEFT (ic);
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ /* if BITWISEOR then check if one of them is 0xff... */
+ /* if yes turn it into 0xff... assignment */
+ if (operandLitValue (IC_RIGHT (ic)) == -1.0)
+ {
+ ic->op = '=';
+ IC_LEFT (ic) = NULL;
+ SET_RESULT_RIGHT (ic);
+ return;
+ }
+ }
+ break;
+ case '^':
+ /* if XOR then check if one of them is a zero */
+ /* if yes turn it into assignment */
+ if (IS_OP_LITERAL (IC_LEFT (ic)) &&
+ operandLitValue (IC_LEFT (ic)) == 0.0)
{
ic->op = '=';
IC_LEFT (ic) = NULL;
- SET_ISADDR (IC_RESULT (ic), 0);
+ SET_RESULT_RIGHT (ic);
+ return;
}
- break;
- case '!':
- if (IS_OP_LITERAL (IC_LEFT (ic)))
+ if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
+ operandLitValue (IC_RIGHT (ic)) == 0.0)
{
ic->op = '=';
- IC_RIGHT (ic) =
- (operandLitValue (IC_LEFT (ic)) == 0 ?
- operandFromLit (1) : operandFromLit (0));
+ IC_RIGHT (ic) = IC_LEFT (ic);
IC_LEFT (ic) = NULL;
- SET_ISADDR (IC_RESULT (ic), 0);
+ SET_RESULT_RIGHT (ic);
+ return;
}
+ break;
}
return;
/*-----------------------------------------------------------------*/
/* updateSpillLocation - keeps track of register spill location */
/*-----------------------------------------------------------------*/
-void
-updateSpillLocation (iCode * ic)
+void
+updateSpillLocation (iCode * ic, int induction)
{
+ sym_link *setype;
- sym_link *setype;
-
- if (POINTER_SET (ic))
- return;
-
- if (ic->nosupdate)
- return;
-
- /* for the form true_symbol := iTempNN */
- if (ASSIGN_ITEMP_TO_SYM (ic)
- && !SPIL_LOC (IC_RIGHT (ic)))
- {
+ if (POINTER_SET (ic))
+ return;
- setype = getSpec (operandType (IC_RESULT (ic)));
+ if (ic->nosupdate)
+ return;
- if (!IC_RIGHT (ic)->noSpilLoc &&
- !IS_VOLATILE (setype) &&
- !IN_FARSPACE (SPEC_OCLS (setype)) &&
- !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
+ /* for the form true_symbol := iTempNN */
+ if (ASSIGN_ITEMP_TO_SYM (ic) &&
+ !SPIL_LOC (IC_RIGHT (ic))) {
- SPIL_LOC (IC_RIGHT (ic)) =
- IC_RESULT (ic)->operand.symOperand;
- }
-
- if (ASSIGN_ITEMP_TO_ITEMP (ic) &&
- !SPIL_LOC (IC_RIGHT (ic)) &&
- !bitVectBitsInCommon (OP_DEFS (IC_RIGHT (ic)), OP_USES (IC_RESULT (ic))) &&
- OP_SYMBOL (IC_RESULT (ic))->isreqv)
- {
+ setype = getSpec (operandType (IC_RESULT (ic)));
- setype = getSpec (operandType (IC_RESULT (ic)));
-
- if (!IC_RIGHT (ic)->noSpilLoc &&
- !IS_VOLATILE (setype) &&
- !IN_FARSPACE (SPEC_OCLS (setype)) &&
- !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
+ if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
+ !IS_VOLATILE (setype) &&
+ !IN_FARSPACE (SPEC_OCLS (setype)) &&
+ !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
+ {
+ wassert(IS_SYMOP(IC_RESULT (ic)));
+ wassert(IS_SYMOP(IC_RIGHT (ic)));
+ SPIL_LOC (IC_RIGHT (ic)) =
+ IC_RESULT (ic)->operand.symOperand;
+ }
+
+ }
- SPIL_LOC (IC_RIGHT (ic)) =
- SPIL_LOC (IC_RESULT (ic));
- }
+#if 0 /* this needs furthur investigation can save a lot of code */
+ if (ASSIGN_SYM_TO_ITEMP(ic) &&
+ !SPIL_LOC(IC_RESULT(ic))) {
+ if (!OTHERS_PARM (OP_SYMBOL (IC_RIGHT (ic))))
+ SPIL_LOC (IC_RESULT (ic)) =
+ IC_RIGHT (ic)->operand.symOperand;
+ }
+#endif
+ if (ASSIGN_ITEMP_TO_ITEMP (ic)) {
+
+ if (!SPIL_LOC (IC_RIGHT (ic)) &&
+ !bitVectBitsInCommon (OP_DEFS (IC_RIGHT (ic)), OP_USES (IC_RESULT (ic))) &&
+ OP_SYMBOL (IC_RESULT (ic))->isreqv) {
+
+ setype = getSpec (operandType (IC_RESULT (ic)));
+
+ if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
+ !IS_VOLATILE (setype) &&
+ !IN_FARSPACE (SPEC_OCLS (setype)) &&
+ !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
+
+ SPIL_LOC (IC_RIGHT (ic)) =
+ SPIL_LOC (IC_RESULT (ic));
+ }
+ /* special case for inductions */
+ if (induction &&
+ OP_SYMBOL(IC_RIGHT(ic))->isreqv &&
+ !OP_SYMBOL(IC_RESULT (ic))->noSpilLoc &&
+ !SPIL_LOC(IC_RESULT(ic))) {
+ SPIL_LOC (IC_RESULT (ic)) = SPIL_LOC (IC_RIGHT (ic));
+ }
+ }
}
-
/*-----------------------------------------------------------------*/
/* setUsesDef - sets the uses def bitvector for a given operand */
/*-----------------------------------------------------------------*/
if (!computeOnly)
{
pdop = NULL;
- applyToSetFTrue (cseSet, findCheaperOp, IC_COND (ic), &pdop);
+ applyToSetFTrue (cseSet, findCheaperOp, IC_COND (ic), &pdop, 0);
if (pdop)
{
- IC_COND (ic) = pdop;
+ ReplaceOpWithCheaperOp(&IC_COND (ic), pdop);
(*change)++;
}
}
/* too often, if it does happen then the user pays */
/* the price */
computeControlFlow (ebbs, count, 1);
- werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
+ if (!options.lessPedantic) {
+ werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
+ }
return;
}
remiCodeFromeBBlock (ebb, ic);
computeControlFlow (ebbs, count, 1);
- werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
+ if (!options.lessPedantic) {
+ werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
+ }
return;
}
/* if it remains an IFX the update the use Set */
- OP_USES (IC_COND (ic)) = bitVectSetBit (OP_USES (IC_COND (ic)), ic->key);
+ OP_USES(IC_COND (ic))=bitVectSetBit (OP_USES (IC_COND (ic)), ic->key);
setUsesDefs (IC_COND (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
return;
}
/* this check is a hueristic to prevent live ranges
from becoming too long */
if (IS_PTR (operandType (IC_RESULT (ic))))
- return 0;
+ return 0;
/* check if operation with a literal */
if (!IS_OP_LITERAL (IC_RIGHT (ic)))
if (IS_ITEMP (IC_RESULT (ic)))
{
SPIL_LOC (IC_RESULT (ic)) = NULL;
- IC_RESULT (ic)->noSpilLoc = 1;
+ OP_SYMBOL(IC_RESULT (ic))->noSpilLoc = 1;
}
iTemp1 = iTemp0 + 8;
iTemp2 = iTemp1 + 8; */
if (isinSetWith (compItems, (void*)IC_LEFT (cdp->diCode),
- (void*)isOperandEqual) ||
+ (insetwithFunc)isOperandEqual) ||
isinSetWith (compItems, (void*)IC_RIGHT (cdp->diCode),
- (void*)isOperandEqual))
+ (insetwithFunc)isOperandEqual))
{
addSet (&compItems, IC_RESULT (cdp->diCode));
}
{
sym_link *t1 = operandType (IC_LEFT (ic)), *t2;
- if (TARGET_IS_DS390)
+ /* if (TARGET_IS_DS390) */
+ if (options.model == MODEL_FLAT24)
{
/* hack-o-matic! */
return;
/* for pointer_gets if the types of result & left r the
same then change it type of result to next */
if (IS_PTR (t1) &&
- checkType (t2 = operandType (IC_RESULT (ic)), t1) == 1)
+ compareType (t2 = operandType (IC_RESULT (ic)), t1) == 1)
{
setOperandType (IC_RESULT (ic), t2->next);
}
}
+/*-----------------------------------------------------------------*/
+/* isSignedOp - will return 1 if sign is important to operation */
+/*-----------------------------------------------------------------*/
+static int isSignedOp (iCode *ic)
+{
+ switch (ic->op) {
+ case '!':
+ case '~':
+ case UNARYMINUS:
+ case IPUSH:
+ case IPOP:
+ case CALL:
+ case PCALL:
+ case RETURN:
+ case '+':
+ case '-':
+ case EQ_OP:
+ case AND_OP:
+ case OR_OP:
+ case '^':
+ case '|':
+ case BITWISEAND:
+ case INLINEASM:
+ case LEFT_OP:
+ case GET_VALUE_AT_ADDRESS:
+ case '=':
+ case IFX:
+ case RECEIVE:
+ case SEND:
+ return 0;
+ case '*':
+ case '/':
+ case '%':
+ case '>':
+ case '<':
+ case LE_OP:
+ case GE_OP:
+ case NE_OP:
+ case RRC:
+ case RLC:
+ case GETHBIT:
+ case RIGHT_OP:
+ case CAST:
+ case ARRAYINIT:
+ return 1;
+ default:
+ return 0;
+ }
+ }
+
/*-----------------------------------------------------------------*/
/* cseBBlock - common subexpression elimination for basic blocks */
/* this is the hackiest kludgiest routine in the whole */
/* if this block is not reachable */
if (ebb->noPath)
- return change;
+ return 0;
/* set of common subexpressions */
cseSet = setFromSet (ebb->inExprs);
/* for all the instructions in this block do */
for (ic = ebb->sch; ic; ic = ic->next)
{
-
iCode *pdic;
operand *pdop;
iCode *defic;
+ int checkSign ;
+
+ ic->eBBlockNum = ebb->bbnum;
if (SKIP_IC2 (ic))
continue;
if (ic->op == PCALL || ic->op == CALL || ic->op == RECEIVE)
{
/* add to defSet of the symbol */
- OP_DEFS (IC_RESULT (ic)) =
+ OP_DEFS(IC_RESULT (ic))=
bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
/* add to the definition set of this block */
ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
/* delete global variables from the cseSet
since they can be modified by the function call */
deleteItemIf (&cseSet, ifDefGlobal);
+
+ /* and also itemps assigned from globals */
+ deleteItemIf (&cseSet, ifAssignedFromGlobal);
+
/* delete all getpointer iCodes from cseSet, this should
be done only for global arrays & pointers but at this
point we don't know if globals, so to be safe do all */
if (!computeOnly)
{
pdop = NULL;
- applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop);
+ applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, 0);
if (pdop)
- IC_LEFT (ic) = pdop;
+ ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
}
/* the lookup could have changed it */
if (IS_SYMOP (IC_LEFT (ic)))
{
- OP_USES (IC_LEFT (ic)) =
+ OP_USES(IC_LEFT (ic))=
bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
setUsesDefs (IC_LEFT (ic), ebb->defSet,
ebb->outDefs, &ebb->usesDefs);
/* if jumptable then mark the usage */
if (ic->op == JUMPTABLE)
{
- OP_USES (IC_JTCOND (ic)) =
+ OP_USES(IC_JTCOND (ic))=
bitVectSetBit (OP_USES (IC_JTCOND (ic)), ic->key);
setUsesDefs (IC_JTCOND (ic), ebb->defSet,
ebb->outDefs, &ebb->usesDefs);
if (SKIP_IC (ic))
continue;
- /* do some algebraic optimizations if possible */
- algebraicOpts (ic);
- while (constFold (ic, cseSet));
+ if (!computeOnly) {
+ /* do some algebraic optimizations if possible */
+ algebraicOpts (ic);
+ while (constFold (ic, cseSet));
+ }
/* small klugde */
if (POINTER_GET (ic) && !IS_PTR (operandType (IC_LEFT (ic))))
aggrToPtr (operandType (IC_RESULT (ic)), FALSE));
}
- /* if this is a condition statment then */
+ /* if this is a condition statement then */
/* check if the condition can be replaced */
if (ic->op == IFX)
{
/* if the assignment & result is a temp */
/* see if we can replace it */
- if (ic->op == '=')
+ if (!computeOnly && ic->op == '=')
{
/* update the spill location for this */
- updateSpillLocation (ic);
+ updateSpillLocation (ic,0);
- if (POINTER_SET (ic) &&
+ if (POINTER_SET (ic) &&
!(IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype)))
{
pdop = NULL;
- applyToSetFTrue (cseSet, findCheaperOp, IC_RESULT (ic), &pdop);
- if (pdop && IS_ITEMP (pdop) && !computeOnly)
- IC_RESULT (ic) = pdop;
+ applyToSetFTrue (cseSet, findCheaperOp, IC_RESULT (ic), &pdop, 0);
+ if (pdop && !computeOnly &&
+ IS_ITEMP (pdop) && IS_PTR(operandType(pdop)))
+ ReplaceOpWithCheaperOp (&IC_RESULT(ic), pdop);
}
}
+ checkSign = isSignedOp(ic);
+
/* do the operand lookup i.e. for both the */
/* right & left operand : check the cseSet */
/* to see if they have been replaced if yes */
{
pdop = NULL;
- applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop);
+ applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, checkSign);
if (pdop)
{
if (POINTER_GET (ic))
{
if (IS_ITEMP (pdop) || IS_OP_LITERAL (pdop))
{
- IC_LEFT (ic) = pdop;
+ /* some non dominating block does POINTER_SET with
+ this variable .. unsafe to remove any POINTER_GETs */
+ if (bitVectBitValue(ebb->ndompset,IC_LEFT(ic)->key))
+ ebb->ptrsSet = bitVectSetBit(ebb->ptrsSet,pdop->key);
+ ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
change = 1;
}
/* check if there is a pointer set
{
ic->op = '=';
IC_LEFT (ic) = NULL;
- IC_RIGHT (ic) = pdop;
+ ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
SET_ISADDR (IC_RESULT (ic), 0);
}
}
else
{
- IC_LEFT (ic) = pdop;
+ ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
change = 1;
}
}
{
pdop = NULL;
- applyToSetFTrue (cseSet, findCheaperOp, IC_RIGHT (ic), &pdop);
- if (pdop)
- {
-
- IC_RIGHT (ic) = pdop;
- change = 1;
- }
+ applyToSetFTrue (cseSet, findCheaperOp, IC_RIGHT (ic), &pdop, checkSign);
+ if (pdop) {
+ ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
+ change = 1;
+ }
}
-
+
/* if left or right changed then do algebraic */
- if (change)
+ if (!computeOnly && change)
{
algebraicOpts (ic);
while (constFold (ic, cseSet));
}
- /* if after all this it becomes a assignment to self
+ /* if after all this it becomes an assignment to self
then delete it and continue */
if (ASSIGNMENT_TO_SELF (ic))
{
IS_ITEMP (IC_RESULT (ic)) &&
!computeOnly)
{
- applyToSet (cseSet, findPrevIc, ic, &pdic);
- if (pdic && checkType (operandType (IC_RESULT (pdic)),
+ applyToSet (cseSet, findPrevIc, ic, &pdic);
+ if (pdic && compareType (operandType (IC_RESULT (pdic)),
operandType (IC_RESULT (ic))) != 1)
pdic = NULL;
+ if (pdic && port->cseOk && (*port->cseOk)(ic,pdic) == 0)
+ pdic = NULL;
}
- /* if found then eliminate this and add to */
- /* to cseSet an element containing result */
- /* of this with previous opcode */
- if (pdic)
- {
-
- if (IS_ITEMP (IC_RESULT (ic)))
- {
-
- /* replace in the remaining of this block */
- replaceAllSymBySym (ic->next, IC_RESULT (ic), IC_RESULT (pdic), &ebb->ndompset);
- /* remove this iCode from inexpressions of all
- its successors, it cannot be in the in expressions
- of any of the predecessors */
- for (i = 0; i < count; ebbs[i++]->visited = 0);
- applyToSet (ebb->succList, removeFromInExprs, ic, IC_RESULT (ic),
- IC_RESULT (pdic), ebb);
-
- /* if this was moved from another block */
- /* then replace in those blocks too */
- if (ic->movedFrom)
- {
- eBBlock *owner;
- for (owner = setFirstItem (ic->movedFrom); owner;
- owner = setNextItem (ic->movedFrom))
- replaceAllSymBySym (owner->sch, IC_RESULT (ic), IC_RESULT (pdic), &owner->ndompset);
- }
- pdic->movedFrom = unionSets (pdic->movedFrom, ic->movedFrom, THROW_NONE);
- }
- else
- addSetHead (&cseSet, newCseDef (IC_RESULT (ic), pdic));
-
- if (!computeOnly)
- /* eliminate this */
- remiCodeFromeBBlock (ebb, ic);
-
- defic = pdic;
- change++;
-
- if (IS_ITEMP (IC_RESULT (ic)))
- continue;
-
+ /* Alternate code */
+ if (pdic && IS_ITEMP(IC_RESULT(ic))) {
+ if (POINTER_GET(ic) && bitVectBitValue(ebb->ptrsSet,IC_LEFT(ic)->key)) {
+ /* Mmm, found an equivalent pointer get at a lower level.
+ This could be a loop however with the same pointer set
+ later on */
+ } else {
+ /* if previous definition found change this to an assignment */
+ ic->op = '=';
+ IC_LEFT(ic) = NULL;
+ IC_RIGHT(ic) = operandFromOperand(IC_RESULT(pdic));
+ SET_ISADDR(IC_RESULT(ic),0);
+ SET_ISADDR(IC_RIGHT (ic),0);
}
- else
- {
-
- /* just add this as a previous expression except in */
- /* case of a pointer access in which case this is a */
- /* usage not a definition */
- if (!(POINTER_SET (ic)) && IC_RESULT (ic))
- {
- deleteItemIf (&cseSet, ifDefSymIsX, IC_RESULT (ic));
- addSetHead (&cseSet, newCseDef (IC_RESULT (ic), ic));
- }
- defic = ic;
+ }
- }
+ if (!(POINTER_SET (ic)) && IC_RESULT (ic)) {
+ deleteItemIf (&cseSet, ifDefSymIsX, IC_RESULT (ic));
+ addSetHead (&cseSet, newCseDef (IC_RESULT (ic), ic));
+ }
+ defic = ic;
/* if assignment to a parameter which is not
mine and type is a pointer then delete
/* add the left & right to the defUse set */
if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)))
{
- OP_USES (IC_LEFT (ic)) =
+ OP_USES(IC_LEFT (ic))=
bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
setUsesDefs (IC_LEFT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)))
{
- OP_USES (IC_RIGHT (ic)) =
+ OP_USES(IC_RIGHT (ic))=
bitVectSetBit (OP_USES (IC_RIGHT (ic)), ic->key);
setUsesDefs (IC_RIGHT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
/* in the defuseSet if it a pointer or array access */
if (POINTER_SET (defic))
{
- OP_USES (IC_RESULT (ic)) =
+ OP_USES(IC_RESULT (ic))=
bitVectSetBit (OP_USES (IC_RESULT (ic)), ic->key);
setUsesDefs (IC_RESULT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
deleteItemIf (&cseSet, ifPointerGet, IC_RESULT (ic));
else
/* add the result to defintion set */ if (IC_RESULT (ic))
{
- OP_DEFS (IC_RESULT (ic)) =
+ OP_DEFS(IC_RESULT (ic))=
bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
ebb->outDefs = bitVectCplAnd (ebb->outDefs, OP_DEFS (IC_RESULT (ic)));
/* cseAllBlocks - will sequentially go thru & do cse for all blocks */
/*-----------------------------------------------------------------*/
int
-cseAllBlocks (eBBlock ** ebbs, int count)
+cseAllBlocks (eBBlock ** ebbs, int count, int computeOnly)
{
int i;
int change = 0;
/* if optimization turned off */
for (i = 0; i < count; i++)
- change += cseBBlock (ebbs[i], FALSE, ebbs, count);
+ change += cseBBlock (ebbs[i], computeOnly, ebbs, count);
return change;
}
projects / fw / sdcc / blobdiff