1 /*-------------------------------------------------------------------------
2 SDCCcse.c - source file for Common Subexpressions and other utility
4 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998)
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 In other words, you are welcome to use, share and improve this program.
21 You are forbidden to forbid anyone else to use, share and improve
22 what you give them. Help stamp out software-hoarding!
23 -------------------------------------------------------------------------*/
28 /*-----------------------------------------------------------------*/
29 /* newCseDef - new cseDef */
30 /*-----------------------------------------------------------------*/
32 newCseDef (operand * sym, iCode * ic)
37 cdp = Safe_alloc (sizeof (cseDef));
48 /*-----------------------------------------------------------------*/
49 /* int isCseDefEqual - two definitions are equal */
50 /*-----------------------------------------------------------------*/
52 isCseDefEqual (void *vsrc, void *vdest)
60 return (src->key == dest->key &&
61 src->diCode == dest->diCode);
65 /*-----------------------------------------------------------------*/
66 /* pcseDef - in the cseDef */
67 /*-----------------------------------------------------------------*/
69 pcseDef (void *item, va_list ap)
77 fprintf (stdout, "**null op**");
78 printOperand (cdp->sym, stdout);
79 icTab = getTableEntry (cdp->diCode->op);
80 icTab->iCodePrint (stdout, cdp->diCode, icTab->printName);
84 void ReplaceOpWithCheaperOp(operand **op, operand *cop) {
86 printf ("ReplaceOpWithCheaperOp %s with %s: ",
87 IS_SYMOP((*op)) ? OP_SYMBOL((*op))->name : "!SYM",
88 IS_SYMOP(cop) ? OP_SYMBOL(cop)->name : "!SYM");
89 // if op is a register equivalent
90 if (IS_ITEMP(cop) && OP_SYMBOL((*op))->isreqv) {
91 operand **rop = &OP_SYMBOL((*op))->usl.spillLoc->reqv;
92 if (isOperandEqual(*rop, *op)) {
95 OP_SYMBOL((*op))->isreqv=0;
96 OP_SYMBOL(cop)->isreqv=1;
106 /*-----------------------------------------------------------------*/
107 /* replaceAllSymBySym - replaces all operands by operand in an */
108 /* instruction chain */
109 /*-----------------------------------------------------------------*/
111 replaceAllSymBySym (iCode * ic, operand * from, operand * to, bitVect ** ndpset)
115 for (lic = ic; lic; lic = lic->next)
119 /* do the special cases first */
123 IC_COND (lic)->key == from->key)
126 bitVectUnSetBit (OP_USES (from), lic->key);
127 OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
128 siaddr = IC_COND (lic)->isaddr;
129 IC_COND (lic) = operandFromOperand (to);
130 IC_COND (lic)->isaddr = siaddr;
136 if (lic->op == JUMPTABLE)
139 IC_JTCOND (lic)->key == from->key)
142 bitVectUnSetBit (OP_USES (from), lic->key);
143 OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
144 siaddr = IC_COND (lic)->isaddr;
145 IC_JTCOND (lic) = operandFromOperand (to);
146 IC_JTCOND (lic)->isaddr = siaddr;
153 IC_RESULT (lic) && IC_RESULT (lic)->key == from->key)
155 /* maintain du chains */
156 if (POINTER_SET (lic))
158 bitVectUnSetBit (OP_USES (from), lic->key);
159 OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
161 /* also check if the "from" was in the non-dominating
162 pointer sets and replace it with "to" in the bitVector */
163 if (bitVectBitValue (*ndpset, from->key))
165 bitVectUnSetBit (*ndpset, from->key);
166 bitVectSetBit (*ndpset, to->key);
172 bitVectUnSetBit (OP_DEFS (from), lic->key);
173 OP_DEFS(to)=bitVectSetBit (OP_DEFS (to), lic->key);
175 siaddr = IC_RESULT (lic)->isaddr;
176 IC_RESULT (lic) = operandFromOperand (to);
177 IC_RESULT (lic)->isaddr = siaddr;
181 IC_RIGHT (lic) && IC_RIGHT (lic)->key == from->key)
183 bitVectUnSetBit (OP_USES (from), lic->key);
184 OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
185 siaddr = IC_RIGHT (lic)->isaddr;
186 IC_RIGHT (lic) = operandFromOperand (to);
187 IC_RIGHT (lic)->isaddr = siaddr;
191 IC_LEFT (lic) && IC_LEFT (lic)->key == from->key)
193 bitVectUnSetBit (OP_USES (from), lic->key);
194 OP_USES(to)=bitVectSetBit (OP_USES (to), lic->key);
195 siaddr = IC_LEFT (lic)->isaddr;
196 IC_LEFT (lic) = operandFromOperand (to);
197 IC_LEFT (lic)->isaddr = siaddr;
202 /*-----------------------------------------------------------------*/
203 /* iCodeKeyIs - if the icode keys match then return 1 */
204 /*-----------------------------------------------------------------*/
205 DEFSETFUNC (iCodeKeyIs)
210 if (cdp->diCode->key == key)
216 /*-----------------------------------------------------------------*/
217 /* removeFromInExprs - removes an icode from inexpressions */
218 /*-----------------------------------------------------------------*/
219 DEFSETFUNC (removeFromInExprs)
223 V_ARG (operand *, from);
224 V_ARG (operand *, to);
225 V_ARG (eBBlock *, cbp);
231 deleteItemIf (&ebp->inExprs, iCodeKeyIs, ic->key);
232 if (ebp != cbp && !bitVectBitValue (cbp->domVect, ebp->bbnum))
233 replaceAllSymBySym (ebp->sch, from, to, &ebp->ndompset);
235 applyToSet (ebp->succList, removeFromInExprs, ic, from, to, cbp);
239 /*-----------------------------------------------------------------*/
240 /* isGlobalInNearSpace - return TRUE if valriable is a globalin data */
241 /*-----------------------------------------------------------------*/
243 isGlobalInNearSpace (operand * op)
245 sym_link *type = getSpec (operandType (op));
246 /* this is 8051 specific: optimization
247 suggested by Jean-Louis VERN, with 8051s we have no
248 advantage of putting variables in near space into
250 if (isOperandGlobal (op) && !IN_FARSPACE (SPEC_OCLS (type)) &&
251 IN_DIRSPACE (SPEC_OCLS (type)))
257 /*-----------------------------------------------------------------*/
258 /* findCheaperOp - cseBBlock support routine, will check to see if */
259 /* we have a operand previously defined */
260 /*-----------------------------------------------------------------*/
261 DEFSETFUNC (findCheaperOp)
264 V_ARG (operand *, cop);
265 V_ARG (operand **, opp);
266 V_ARG (int, checkSign);
268 /* if we have already found it */
272 /* not found it yet check if this is the one */
273 /* and this is not the defining one */
274 if (cop->key == cdp->key)
277 /* do a special check this will help in */
278 /* constant propagation & dead code elim */
279 /* for assignments only */
280 if (cdp->diCode->op == '=') {
281 /* if the result is volatile then return result */
282 if (IS_OP_VOLATILE (IC_RESULT (cdp->diCode)))
283 *opp = IC_RESULT (cdp->diCode);
285 /* if this is a straight assignment and
286 left is a temp then prefer the temporary to the
288 if (!POINTER_SET (cdp->diCode) &&
289 IS_ITEMP (IC_RESULT (cdp->diCode)) &&
290 IS_TRUE_SYMOP (IC_RIGHT (cdp->diCode)))
291 *opp = IC_RESULT (cdp->diCode);
293 /* if straight assignement && and both
294 are temps then prefer the one that
295 will not need extra space to spil, also
296 take into consideration if right side
297 an induction variable
299 if (!POINTER_SET (cdp->diCode) &&
300 IS_ITEMP (IC_RESULT (cdp->diCode)) &&
301 IS_ITEMP (IC_RIGHT (cdp->diCode)) &&
302 !OP_SYMBOL (IC_RIGHT (cdp->diCode))->isind &&
303 !OP_SYMBOL(IC_RIGHT (cdp->diCode))->isreqv &&
304 ((!SPIL_LOC (IC_RIGHT (cdp->diCode)) &&
305 SPIL_LOC (IC_RESULT (cdp->diCode))) ||
306 (SPIL_LOC (IC_RESULT (cdp->diCode)) &&
307 SPIL_LOC (IC_RESULT (cdp->diCode)) ==
308 SPIL_LOC (IC_RIGHT (cdp->diCode)))))
309 *opp = IC_RESULT (cdp->diCode);
311 *opp = IC_RIGHT (cdp->diCode);
315 *opp = IC_RESULT (cdp->diCode);
318 /* if this is an assign to a temp. then check
319 if the right side is this then return this */
320 if (IS_TRUE_SYMOP (cop) &&
321 cdp->diCode->op == '=' &&
322 !POINTER_SET (cdp->diCode) &&
323 cop->key == IC_RIGHT (cdp->diCode)->key &&
324 !isGlobalInNearSpace (IC_RIGHT (cdp->diCode)) &&
325 IS_ITEMP (IC_RESULT (cdp->diCode)))
326 *opp = IC_RESULT (cdp->diCode);
329 (isOperandLiteral(*opp) || !checkSign ||
331 IS_SPEC(operandType (cop)) && IS_SPEC(operandType (*opp)) &&
332 (SPEC_USIGN(operandType (cop))==SPEC_USIGN(operandType (*opp)) &&
333 (SPEC_LONG(operandType (cop))==SPEC_LONG(operandType (*opp)))))))
336 if ((isGlobalInNearSpace (cop) &&
337 !isOperandLiteral (*opp)) ||
338 isOperandVolatile (*opp, FALSE)
345 if (cop->key == (*opp)->key)
351 if ((*opp)->isaddr != cop->isaddr && IS_ITEMP (cop))
353 *opp = operandFromOperand (*opp);
354 (*opp)->isaddr = cop->isaddr;
357 if (IS_SPEC(operandType (cop)) && IS_SPEC(operandType (*opp)) &&
358 SPEC_NOUN(operandType(cop)) != SPEC_NOUN(operandType(*opp)))
360 // special case: we can make an unsigned char literal
361 // into an int literal with no cost.
362 if (isOperandLiteral(*opp)
363 && SPEC_NOUN(operandType(*opp)) == V_CHAR
364 && SPEC_NOUN(operandType(cop)) == V_INT)
366 *opp = operandFromOperand (*opp);
367 SPEC_NOUN(operandType(*opp)) = V_INT;
385 /*-----------------------------------------------------------------*/
386 /* findPointerSet - finds the right side of a pointer set op */
387 /*-----------------------------------------------------------------*/
388 DEFSETFUNC (findPointerSet)
391 V_ARG (operand *, op);
392 V_ARG (operand **, opp);
393 V_ARG (operand *, rop);
395 if (POINTER_SET (cdp->diCode) &&
396 IC_RESULT (cdp->diCode)->key == op->key &&
397 !isOperandVolatile (IC_RESULT (cdp->diCode), TRUE) &&
398 !isOperandVolatile (IC_RIGHT (cdp->diCode), TRUE) &&
399 getSize (operandType (IC_RIGHT (cdp->diCode))) ==
400 getSize (operandType (rop)))
402 *opp = IC_RIGHT (cdp->diCode);
409 /*-----------------------------------------------------------------*/
410 /* findPrevIc - cseBBlock support function will return the iCode */
411 /* which matches the current one */
412 /*-----------------------------------------------------------------*/
413 DEFSETFUNC (findPrevIc)
417 V_ARG (iCode **, icp);
419 /* if already found */
423 /* if the iCodes are the same */
424 if (isiCodeEqual (ic, cdp->diCode) &&
425 isOperandEqual (cdp->sym, IC_RESULT (cdp->diCode)))
431 /* if iCodes are not the same */
432 /* see the operands maybe interchanged */
433 if (ic->op == cdp->diCode->op &&
434 (ic->op == '+' || ic->op == '*') &&
435 isOperandEqual (IC_LEFT (ic), IC_RIGHT (cdp->diCode)) &&
436 isOperandEqual (IC_RIGHT (ic), IC_LEFT (cdp->diCode)))
445 /*-------------------------------------------------------------------*/
446 /* ifAssignedFromGlobal - if definition is an assignment from global */
447 /*-------------------------------------------------------------------*/
448 DEFSETFUNC (ifAssignedFromGlobal)
451 iCode *dic=cdp->diCode;
453 if (dic->op=='=' && isOperandGlobal(IC_RIGHT(dic))) {
459 /*-----------------------------------------------------------------*/
460 /* ifDefGlobal - if definition is global */
461 /*-----------------------------------------------------------------*/
462 DEFSETFUNC (ifDefGlobal)
466 return (isOperandGlobal (cdp->sym));
469 /*-----------------------------------------------------------------*/
470 /* ifAnyGetPointer - if get pointer icode */
471 /*-----------------------------------------------------------------*/
472 DEFSETFUNC (ifAnyGetPointer)
476 if (cdp->diCode && POINTER_GET (cdp->diCode))
481 /*-----------------------------------------------------------------*/
482 /* ifOperandsHave - if any of the operand are the same as this */
483 /*-----------------------------------------------------------------*/
484 DEFSETFUNC (ifOperandsHave)
487 V_ARG (operand *, op);
490 if (IC_LEFT (cdp->diCode) &&
491 IS_SYMOP (IC_LEFT (cdp->diCode)) &&
492 IC_LEFT (cdp->diCode)->key == op->key)
495 if (IC_RIGHT (cdp->diCode) &&
496 IS_SYMOP (IC_RIGHT (cdp->diCode)) &&
497 IC_RIGHT (cdp->diCode)->key == op->key)
500 /* or if any of the operands are volatile */
501 if (IC_LEFT (cdp->diCode) &&
502 IS_OP_VOLATILE (IC_LEFT (cdp->diCode)))
505 if (IC_RIGHT (cdp->diCode) &&
506 IS_OP_VOLATILE (IC_RIGHT (cdp->diCode)))
510 if (IC_RESULT (cdp->diCode) &&
511 IS_OP_VOLATILE (IC_RESULT (cdp->diCode)))
517 /*-----------------------------------------------------------------*/
518 /* ifDefSymIs - if a definition is found in the set */
519 /*-----------------------------------------------------------------*/
521 ifDefSymIs (set * cseSet, operand * sym)
526 if (!sym || !IS_SYMOP (sym))
528 for (sl = cseSet; sl; sl = sl->next)
531 if (loop->sym->key == sym->key)
538 /*-----------------------------------------------------------------*/
539 /* ifDefSymIsX - will return 1 if the symbols match */
540 /*-----------------------------------------------------------------*/
541 DEFSETFUNC (ifDefSymIsX)
544 V_ARG (operand *, op);
547 return cdp->sym->key == op->key;
549 return (isOperandEqual (cdp->sym, op));
554 /*-----------------------------------------------------------------*/
555 /* ifDiCodeIs - returns truw if diCode is same */
556 /*-----------------------------------------------------------------*/
558 ifDiCodeIs (set * cseSet, iCode * ic)
566 for (sl = cseSet; sl; sl = sl->next)
569 if (loop->diCode == ic)
576 /*-----------------------------------------------------------------*/
577 /* ifPointerGet - returns true if the icode is pointer get sym */
578 /*-----------------------------------------------------------------*/
579 DEFSETFUNC (ifPointerGet)
582 V_ARG (operand *, op);
583 iCode *dic = cdp->diCode;
584 operand *left = IC_LEFT (cdp->diCode);
586 if (POINTER_GET (dic) && left->key == op->key)
592 /*-----------------------------------------------------------------*/
593 /* ifPointerSet - returns true if the icode is pointer set sym */
594 /*-----------------------------------------------------------------*/
595 DEFSETFUNC (ifPointerSet)
598 V_ARG (operand *, op);
600 if (POINTER_SET (cdp->diCode) &&
601 IC_RESULT (cdp->diCode)->key == op->key)
607 /*-----------------------------------------------------------------*/
608 /* ifDiCodeIsX - will return 1 if the symbols match */
609 /*-----------------------------------------------------------------*/
610 DEFSETFUNC (ifDiCodeIsX)
615 return cdp->diCode == ic;
619 /*-----------------------------------------------------------------*/
620 /* findBackwardDef - scan backwards to find deinition of operand */
621 /*-----------------------------------------------------------------*/
622 iCode *findBackwardDef(operand *op,iCode *ic)
626 for (lic = ic; lic ; lic = lic->prev) {
627 if (IC_RESULT(lic) && isOperandEqual(op,IC_RESULT(lic)))
633 /*-----------------------------------------------------------------*/
634 /* algebraicOpts - does some algebraic optimizations */
635 /*-----------------------------------------------------------------*/
637 algebraicOpts (iCode * ic)
639 /* we don't deal with the following iCodes
650 /* if both operands present & ! IFX */
651 /* then if they are both literal we */
652 /* perform the operation right now */
653 if (IC_RESULT (ic) &&
656 IS_OP_LITERAL (IC_LEFT (ic)) &&
657 IS_OP_LITERAL (IC_RIGHT (ic)))
660 IC_RIGHT (ic) = operandOperation (IC_LEFT (ic),
663 operandType (IC_RESULT (ic)));
666 SET_RESULT_RIGHT (ic);
670 /* if not ifx & only one operand present */
671 if (IC_RESULT (ic) &&
673 IS_OP_LITERAL (IC_LEFT (ic)) &&
677 IC_RIGHT (ic) = operandOperation (IC_LEFT (ic),
680 operandType (IC_RESULT (ic)));
683 SET_RESULT_RIGHT (ic);
688 /* a special case : or in short a kludgy solution will think
689 about a better solution over a glass of wine someday */
690 if (ic->op == GET_VALUE_AT_ADDRESS)
693 if (IS_ITEMP (IC_RESULT (ic)) &&
694 IS_TRUE_SYMOP (IC_LEFT (ic)))
698 IC_RIGHT (ic) = operandFromOperand (IC_LEFT (ic));
699 IC_RIGHT (ic)->isaddr = 0;
701 IC_RESULT (ic) = operandFromOperand (IC_RESULT (ic));
702 IC_RESULT (ic)->isaddr = 0;
703 setOperandType (IC_RESULT (ic), operandType (IC_RIGHT (ic)));
707 if (IS_ITEMP (IC_LEFT (ic)) &&
708 IS_ITEMP (IC_RESULT (ic)) &&
709 /* !OP_SYMBOL(IC_RESULT(ic))->isreqv && */
710 /* !OP_SYMBOL(IC_LEFT(ic))->isreqv && */
711 !IC_LEFT (ic)->isaddr)
714 IC_RIGHT (ic) = operandFromOperand (IC_LEFT (ic));
715 IC_RIGHT (ic)->isaddr = 0;
716 IC_RESULT (ic) = operandFromOperand (IC_RESULT (ic));
717 IC_RESULT (ic)->isaddr = 0;
725 /* depending on the operation */
729 /* if adding the same thing change to left shift by 1 */
730 if (IC_LEFT (ic)->key == IC_RIGHT (ic)->key &&
731 !IS_FLOAT (operandType (IC_RESULT (ic))))
734 IC_RIGHT (ic) = operandFromLit (1);
737 /* if addition then check if one of them is a zero */
738 /* if yes turn it into assignmnt */
739 if (IS_OP_LITERAL (IC_LEFT (ic)) &&
740 operandLitValue (IC_LEFT (ic)) == 0.0)
745 SET_ISADDR (IC_RESULT (ic), 0);
746 SET_ISADDR (IC_RIGHT (ic), 0);
749 if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
750 operandLitValue (IC_RIGHT (ic)) == 0.0)
754 IC_RIGHT (ic) = IC_LEFT (ic);
756 SET_ISADDR (IC_RIGHT (ic), 0);
757 SET_ISADDR (IC_RESULT (ic), 0);
762 /* if subtracting the the same thing then zero */
763 if (IC_LEFT (ic)->key == IC_RIGHT (ic)->key)
766 IC_RIGHT (ic) = operandFromLit (0);
768 IC_RESULT (ic) = operandFromOperand (IC_RESULT (ic));
769 IC_RESULT (ic)->isaddr = 0;
773 /* if subtraction then check if one of the operand */
774 /* is zero then depending on which operand change */
775 /* to assignment or unary minus */
776 if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
777 operandLitValue (IC_RIGHT (ic)) == 0.0)
779 /* right size zero change to assignment */
781 IC_RIGHT (ic) = IC_LEFT (ic);
783 SET_ISADDR (IC_RIGHT (ic), 0);
784 SET_ISADDR (IC_RESULT (ic), 0);
787 if (IS_OP_LITERAL (IC_LEFT (ic)) &&
788 operandLitValue (IC_LEFT (ic)) == 0.0)
790 /* left zero turn into an unary minus */
792 IC_LEFT (ic) = IC_RIGHT (ic);
793 IC_RIGHT (ic) = NULL;
797 /* if multiplication then check if either of */
798 /* them is zero then the result is zero */
799 /* if either of them is one then result is */
802 if (IS_OP_LITERAL (IC_LEFT (ic)))
805 if (operandLitValue (IC_LEFT (ic)) == 0.0)
808 IC_RIGHT (ic) = IC_LEFT (ic);
810 SET_RESULT_RIGHT (ic);
813 if (operandLitValue (IC_LEFT (ic)) == 1.0)
815 /* '*' can have two unsigned chars as operands */
816 /* and an unsigned int as result. */
817 if (compareType (operandType (IC_RESULT (ic)),
818 operandType (IC_RIGHT (ic))) == 1)
822 SET_RESULT_RIGHT (ic);
827 IC_LEFT (ic)->type = TYPE;
828 setOperandType (IC_LEFT (ic), operandType (IC_RESULT (ic)));
834 if (IS_OP_LITERAL (IC_RIGHT (ic)))
837 if (operandLitValue (IC_RIGHT (ic)) == 0.0)
841 SET_RESULT_RIGHT (ic);
845 if (operandLitValue (IC_RIGHT (ic)) == 1.0)
847 /* '*' can have two unsigned chars as operands */
848 /* and an unsigned int as result. */
849 if (compareType (operandType (IC_RESULT (ic)),
850 operandType (IC_LEFT (ic))) == 1)
853 IC_RIGHT (ic) = IC_LEFT (ic);
855 SET_RESULT_RIGHT (ic);
863 IC_RIGHT (ic) = IC_LEFT (ic);
865 IC_LEFT (ic)->type = TYPE;
866 setOperandType (IC_LEFT (ic), operandType (IC_RESULT (ic)));
873 /* if division by self then 1 */
874 if (IC_LEFT (ic)->key == IC_RIGHT (ic)->key)
877 IC_RIGHT (ic) = operandFromLit (1);
879 IC_RESULT (ic) = operandFromOperand (IC_RESULT (ic));
880 IC_RESULT (ic)->isaddr = 0;
883 /* if this is a division then check if right */
884 /* is one then change it to an assignment */
885 if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
886 operandLitValue (IC_RIGHT (ic)) == 1.0)
890 IC_RIGHT (ic) = IC_LEFT (ic);
892 SET_RESULT_RIGHT (ic);
896 /* if both are the same for an comparison operators */
900 if (isOperandEqual (IC_LEFT (ic), IC_RIGHT (ic)))
903 IC_RIGHT (ic) = operandFromLit (1);
905 SET_RESULT_RIGHT (ic);
911 if (isOperandEqual (IC_LEFT (ic), IC_RIGHT (ic)))
914 IC_RIGHT (ic) = operandFromLit (0);
916 SET_RESULT_RIGHT (ic);
921 sym_link *otype = operandType(IC_RIGHT(ic));
922 sym_link *ctype = operandType(IC_LEFT(ic));
923 /* if this is a cast of a literal value */
924 if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
925 !(IS_GENPTR(ctype) && (IS_PTR(otype) && !IS_GENPTR(otype)))) {
928 operandFromValue (valCastLiteral (operandType (IC_LEFT (ic)),
929 operandLitValue (IC_RIGHT (ic))));
931 SET_ISADDR (IC_RESULT (ic), 0);
933 /* if casting to the same */
934 if (compareType (operandType (IC_RESULT (ic)),
935 operandType (IC_RIGHT (ic))) == 1) {
938 SET_ISADDR (IC_RESULT (ic), 0);
943 if (IS_OP_LITERAL (IC_LEFT (ic)))
947 (operandLitValue (IC_LEFT (ic)) == 0 ?
948 operandFromLit (1) : operandFromLit (0));
950 SET_ISADDR (IC_RESULT (ic), 0);
956 #define OTHERS_PARM(s) (s->_isparm && !s->ismyparm)
957 /*-----------------------------------------------------------------*/
958 /* updateSpillLocation - keeps track of register spill location */
959 /*-----------------------------------------------------------------*/
961 updateSpillLocation (iCode * ic, int induction)
965 if (POINTER_SET (ic))
971 /* for the form true_symbol := iTempNN */
972 if (ASSIGN_ITEMP_TO_SYM (ic) &&
973 !SPIL_LOC (IC_RIGHT (ic))) {
975 setype = getSpec (operandType (IC_RESULT (ic)));
977 if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
978 !IS_VOLATILE (setype) &&
979 !IN_FARSPACE (SPEC_OCLS (setype)) &&
980 !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
982 wassert(IS_SYMOP(IC_RESULT (ic)));
983 wassert(IS_SYMOP(IC_RIGHT (ic)));
984 SPIL_LOC (IC_RIGHT (ic)) =
985 IC_RESULT (ic)->operand.symOperand;
990 #if 0 /* this needs furthur investigation can save a lot of code */
991 if (ASSIGN_SYM_TO_ITEMP(ic) &&
992 !SPIL_LOC(IC_RESULT(ic))) {
993 if (!OTHERS_PARM (OP_SYMBOL (IC_RIGHT (ic))))
994 SPIL_LOC (IC_RESULT (ic)) =
995 IC_RIGHT (ic)->operand.symOperand;
998 if (ASSIGN_ITEMP_TO_ITEMP (ic)) {
1000 if (!SPIL_LOC (IC_RIGHT (ic)) &&
1001 !bitVectBitsInCommon (OP_DEFS (IC_RIGHT (ic)), OP_USES (IC_RESULT (ic))) &&
1002 OP_SYMBOL (IC_RESULT (ic))->isreqv) {
1004 setype = getSpec (operandType (IC_RESULT (ic)));
1006 if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
1007 !IS_VOLATILE (setype) &&
1008 !IN_FARSPACE (SPEC_OCLS (setype)) &&
1009 !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
1011 SPIL_LOC (IC_RIGHT (ic)) =
1012 SPIL_LOC (IC_RESULT (ic));
1014 /* special case for inductions */
1016 OP_SYMBOL(IC_RIGHT(ic))->isreqv &&
1017 !OP_SYMBOL(IC_RESULT (ic))->noSpilLoc &&
1018 !SPIL_LOC(IC_RESULT(ic))) {
1019 SPIL_LOC (IC_RESULT (ic)) = SPIL_LOC (IC_RIGHT (ic));
1023 /*-----------------------------------------------------------------*/
1024 /* setUsesDef - sets the uses def bitvector for a given operand */
1025 /*-----------------------------------------------------------------*/
1027 setUsesDefs (operand * op, bitVect * bdefs,
1028 bitVect * idefs, bitVect ** oud)
1030 /* compute the definitions alive at this point */
1031 bitVect *adefs = bitVectUnion (bdefs, idefs);
1033 /* of these definitions find the ones that are */
1034 /* for this operand */
1035 adefs = bitVectIntersect (adefs, OP_DEFS (op));
1037 /* these are the definitions that this operand can use */
1038 op->usesDefs = adefs;
1040 /* the out defs is an union */
1041 *oud = bitVectUnion (*oud, adefs);
1044 /*-----------------------------------------------------------------*/
1045 /* unsetDefsAndUses - clear this operation for the operands */
1046 /*-----------------------------------------------------------------*/
1048 unsetDefsAndUses (iCode * ic)
1050 if (ic->op == JUMPTABLE)
1053 /* take away this definition from the def chain of the */
1054 /* result & take away from use set of the operands */
1057 /* turn off def set */
1058 if (IS_SYMOP (IC_RESULT (ic)))
1060 if (!POINTER_SET (ic))
1061 bitVectUnSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1063 bitVectUnSetBit (OP_USES (IC_RESULT (ic)), ic->key);
1065 /* turn off the useSet for the operands */
1066 if (IS_SYMOP (IC_LEFT (ic)))
1067 bitVectUnSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1069 if (IS_SYMOP (IC_RIGHT (ic)))
1070 bitVectUnSetBit (OP_USES (IC_RIGHT (ic)), ic->key);
1073 /* must be ifx turn off the use */ if (IS_SYMOP (IC_COND (ic)))
1074 bitVectUnSetBit (OP_USES (IC_COND (ic)), ic->key);
1077 /*-----------------------------------------------------------------*/
1078 /* ifxOptimize - changes ifx conditions if it can */
1079 /*-----------------------------------------------------------------*/
1081 ifxOptimize (iCode * ic, set * cseSet,
1083 eBBlock * ebb, int *change,
1084 eBBlock ** ebbs, int count)
1089 /* if the condition can be replaced */
1093 applyToSetFTrue (cseSet, findCheaperOp, IC_COND (ic), &pdop, 0);
1096 ReplaceOpWithCheaperOp(&IC_COND (ic), pdop);
1101 /* if the conditional is a literal then */
1102 if (IS_OP_LITERAL (IC_COND (ic)))
1105 if ((operandLitValue (IC_COND (ic)) != 0.0) && IC_TRUE (ic))
1108 /* change to a goto */
1110 IC_LABEL (ic) = IC_TRUE (ic);
1117 if (!operandLitValue (IC_COND (ic)) && IC_FALSE (ic))
1120 IC_LABEL (ic) = IC_FALSE (ic);
1126 /* then kill this if condition */
1127 remiCodeFromeBBlock (ebb, ic);
1131 /* now we need to recompute the control flow */
1132 /* since the control flow has changed */
1133 /* this is very expensive but it does not happen */
1134 /* too often, if it does happen then the user pays */
1136 computeControlFlow (ebbs, count, 1);
1137 if (!options.lessPedantic) {
1138 werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
1143 /* if there is only one successor and that successor
1144 is the same one we are conditionally going to then
1145 we can remove this conditional statement */
1146 label = (IC_TRUE (ic) ? IC_TRUE (ic) : IC_FALSE (ic));
1147 if (elementsInSet (ebb->succList) == 1 &&
1148 isinSet (ebb->succList, eBBWithEntryLabel (ebbs, label, count)))
1151 remiCodeFromeBBlock (ebb, ic);
1152 computeControlFlow (ebbs, count, 1);
1153 if (!options.lessPedantic) {
1154 werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
1160 /* if it remains an IFX the update the use Set */
1161 OP_USES(IC_COND (ic))=bitVectSetBit (OP_USES (IC_COND (ic)), ic->key);
1162 setUsesDefs (IC_COND (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1166 /*-----------------------------------------------------------------*/
1167 /* diCodeForSym - finds the definiting instruction for a symbol */
1168 /*-----------------------------------------------------------------*/
1169 DEFSETFUNC (diCodeForSym)
1172 V_ARG (operand *, sym);
1173 V_ARG (iCode **, dic);
1175 /* if already found */
1179 /* if not if this is the defining iCode */
1180 if (sym->key == cdp->key)
1189 /*-----------------------------------------------------------------*/
1190 /* constFold - does some constant folding */
1191 /*-----------------------------------------------------------------*/
1193 constFold (iCode * ic, set * cseSet)
1197 /* this routine will change
1203 /* deal with only + & - */
1204 if (ic->op != '+' &&
1208 /* this check is a hueristic to prevent live ranges
1209 from becoming too long */
1210 if (IS_PTR (operandType (IC_RESULT (ic))))
1213 /* check if operation with a literal */
1214 if (!IS_OP_LITERAL (IC_RIGHT (ic)))
1217 /* check if we can find a definition for the
1219 if (!(applyToSet (cseSet, diCodeForSym, IC_LEFT (ic), &dic)))
1222 /* check that this is also a +/- */
1223 if (dic->op != '+' && dic->op != '-')
1226 /* with a literal */
1227 if (!IS_OP_LITERAL (IC_RIGHT (dic)))
1230 /* find the definition of the left operand
1231 of dic.then check if this defined with a
1232 get_pointer return 0 if the pointer size is
1233 less than 2 (MCS51 specific) */
1234 if (!(applyToSet (cseSet, diCodeForSym, IC_LEFT (dic), &ldic)))
1237 if (POINTER_GET (ldic) && getSize (operandType (IC_LEFT (ldic))) <= 1)
1240 /* it is if the operations are the same */
1241 /* the literal parts need to be added */
1242 IC_LEFT (ic) = operandFromOperand (IC_LEFT (dic));
1243 if (ic->op == dic->op)
1244 IC_RIGHT (ic) = operandFromLit (operandLitValue (IC_RIGHT (ic)) +
1245 operandLitValue (IC_RIGHT (dic)));
1247 IC_RIGHT (ic) = operandFromLit (operandLitValue (IC_RIGHT (ic)) -
1248 operandLitValue (IC_RIGHT (dic)));
1250 if (IS_ITEMP (IC_RESULT (ic)))
1252 SPIL_LOC (IC_RESULT (ic)) = NULL;
1253 OP_SYMBOL(IC_RESULT (ic))->noSpilLoc = 1;
1260 /*-----------------------------------------------------------------*/
1261 /* deleteGetPointers - called when a pointer is passed as parm */
1262 /* will delete from cseSet all get pointers computed from this */
1263 /* pointer. A simple ifOperandsHave is not good enough here */
1264 /*-----------------------------------------------------------------*/
1266 deleteGetPointers (set ** cseSet, set ** pss, operand * op, eBBlock * ebb)
1268 set *compItems = NULL;
1273 if (!*cseSet && !*pss)
1276 /* first find all items computed from this operand .
1277 This done fairly simply go thru the list and find
1278 those that are computed by arthimetic with this
1280 for (cdp = setFirstItem (*cseSet); cdp; cdp = setNextItem (*cseSet))
1282 if (IS_ARITHMETIC_OP (cdp->diCode))
1284 if (isOperandEqual (IC_LEFT (cdp->diCode), op) ||
1285 isOperandEqual (IC_RIGHT (cdp->diCode), op))
1287 /* save it in our list of items */
1288 addSet (&compItems, IC_RESULT (cdp->diCode));
1290 /* also check for those computed from our computed
1291 list . This will take care of situations like
1292 iTemp1 = iTemp0 + 8;
1293 iTemp2 = iTemp1 + 8; */
1294 if (isinSetWith (compItems, (void*)IC_LEFT (cdp->diCode),
1295 (insetwithFunc)isOperandEqual) ||
1296 isinSetWith (compItems, (void*)IC_RIGHT (cdp->diCode),
1297 (insetwithFunc)isOperandEqual))
1299 addSet (&compItems, IC_RESULT (cdp->diCode));
1304 /* now delete all pointer gets with this op */
1305 deleteItemIf (cseSet, ifPointerGet, op);
1306 deleteItemIf (pss, ifPointerSet, op);
1308 /* set the bit vector used by dataFlow computation later */
1309 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, op->key);
1310 /* now for the computed items */
1311 for (cop = setFirstItem (compItems); cop; cop = setNextItem (compItems))
1313 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, cop->key);
1314 deleteItemIf (cseSet, ifPointerGet, cop);
1315 deleteItemIf (pss, ifPointerSet, cop);
1319 /*-----------------------------------------------------------------*/
1320 /* delGetPointerSucc - delete get pointer from inExprs of succ with */
1321 /* dfnum > supplied */
1322 /*-----------------------------------------------------------------*/
1323 DEFSETFUNC (delGetPointerSucc)
1325 eBBlock *ebp = item;
1326 V_ARG (operand *, op);
1333 if (ebp->dfnum > dfnum)
1335 deleteItemIf (&ebp->inExprs, ifPointerGet, op);
1338 return applyToSet (ebp->succList, delGetPointerSucc, op, dfnum);
1341 /*-----------------------------------------------------------------*/
1342 /* fixUpTypes - KLUGE HACK fixup a lowering problem */
1343 /*-----------------------------------------------------------------*/
1345 fixUpTypes (iCode * ic)
1347 sym_link *t1 = operandType (IC_LEFT (ic)), *t2;
1349 /* if (TARGET_IS_DS390) */
1350 if (options.model == MODEL_FLAT24)
1356 /* for pointer_gets if the types of result & left r the
1357 same then change it type of result to next */
1359 compareType (t2 = operandType (IC_RESULT (ic)), t1) == 1)
1361 setOperandType (IC_RESULT (ic), t2->next);
1365 /*-----------------------------------------------------------------*/
1366 /* isSignedOp - will return 1 if sign is important to operation */
1367 /*-----------------------------------------------------------------*/
1368 static int isSignedOp (iCode *ic)
1389 case GET_VALUE_AT_ADDRESS:
1415 /*-----------------------------------------------------------------*/
1416 /* cseBBlock - common subexpression elimination for basic blocks */
1417 /* this is the hackiest kludgiest routine in the whole */
1418 /* system. also the most important, since almost all */
1419 /* data flow related information is computed by it */
1420 /*-----------------------------------------------------------------*/
1422 cseBBlock (eBBlock * ebb, int computeOnly,
1423 eBBlock ** ebbs, int count)
1429 set *ptrSetSet = NULL;
1431 /* if this block is not reachable */
1435 /* set of common subexpressions */
1436 cseSet = setFromSet (ebb->inExprs);
1438 /* these will be computed by this routine */
1439 setToNull ((void **) &ebb->outDefs);
1440 setToNull ((void **) &ebb->defSet);
1441 setToNull ((void **) &ebb->usesDefs);
1442 setToNull ((void **) &ebb->ptrsSet);
1443 setToNull ((void **) &ebb->addrOf);
1444 setToNull ((void **) &ebb->ldefs);
1446 ebb->outDefs = bitVectCopy (ebb->inDefs);
1447 bitVectDefault = iCodeKey;
1448 ebb->defSet = newBitVect (iCodeKey);
1449 ebb->usesDefs = newBitVect (iCodeKey);
1451 /* for all the instructions in this block do */
1452 for (ic = ebb->sch; ic; ic = ic->next)
1459 ic->eBBlockNum = ebb->bbnum;
1464 /* if this is an assignment from true symbol
1465 to a temp then do pointer post inc/dec optimzation */
1466 if (ic->op == '=' && !POINTER_SET (ic) &&
1467 IS_PTR (operandType (IC_RESULT (ic))))
1469 ptrPostIncDecOpt (ic);
1472 /* clear the def & use chains for the operands involved */
1473 /* in this operation . since it can change due to opts */
1474 unsetDefsAndUses (ic);
1476 if (ic->op == PCALL || ic->op == CALL || ic->op == RECEIVE)
1478 /* add to defSet of the symbol */
1479 OP_DEFS(IC_RESULT (ic))=
1480 bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1481 /* add to the definition set of this block */
1482 ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
1483 ebb->ldefs = bitVectSetBit (ebb->ldefs, ic->key);
1484 ebb->outDefs = bitVectCplAnd (ebb->outDefs, OP_DEFS (IC_RESULT (ic)));
1485 setUsesDefs (IC_RESULT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1486 /* delete global variables from the cseSet
1487 since they can be modified by the function call */
1488 deleteItemIf (&cseSet, ifDefGlobal);
1490 /* and also itemps assigned from globals */
1491 deleteItemIf (&cseSet, ifAssignedFromGlobal);
1493 /* delete all getpointer iCodes from cseSet, this should
1494 be done only for global arrays & pointers but at this
1495 point we don't know if globals, so to be safe do all */
1496 deleteItemIf (&cseSet, ifAnyGetPointer);
1499 /* for pcall & ipush we need to add to the useSet */
1500 if ((ic->op == PCALL ||
1504 IS_SYMOP (IC_LEFT (ic)))
1507 /* check if they can be replaced */
1511 applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, 0);
1513 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1515 /* the lookup could have changed it */
1516 if (IS_SYMOP (IC_LEFT (ic)))
1518 OP_USES(IC_LEFT (ic))=
1519 bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1520 setUsesDefs (IC_LEFT (ic), ebb->defSet,
1521 ebb->outDefs, &ebb->usesDefs);
1525 /* if we a sending a pointer as a parameter
1526 then kill all cse since the pointed to item
1527 might be changed in the function being called */
1528 if ((ic->op == IPUSH || ic->op == SEND) &&
1529 IS_PTR (operandType (IC_LEFT (ic))))
1531 deleteGetPointers (&cseSet, &ptrSetSet, IC_LEFT (ic), ebb);
1532 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_LEFT (ic)->key);
1533 for (i = 0; i < count; ebbs[i++]->visited = 0);
1534 applyToSet (ebb->succList, delGetPointerSucc,
1535 IC_LEFT (ic), ebb->dfnum);
1540 /* if jumptable then mark the usage */
1541 if (ic->op == JUMPTABLE)
1543 OP_USES(IC_JTCOND (ic))=
1544 bitVectSetBit (OP_USES (IC_JTCOND (ic)), ic->key);
1545 setUsesDefs (IC_JTCOND (ic), ebb->defSet,
1546 ebb->outDefs, &ebb->usesDefs);
1554 /* do some algebraic optimizations if possible */
1556 while (constFold (ic, cseSet));
1560 if (POINTER_GET (ic) && !IS_PTR (operandType (IC_LEFT (ic))))
1562 setOperandType (IC_LEFT (ic),
1563 aggrToPtr (operandType (IC_LEFT (ic)), FALSE));
1567 if (POINTER_SET (ic) && !IS_PTR (operandType (IC_RESULT (ic))))
1569 setOperandType (IC_RESULT (ic),
1570 aggrToPtr (operandType (IC_RESULT (ic)), FALSE));
1573 /* if this is a condition statement then */
1574 /* check if the condition can be replaced */
1577 ifxOptimize (ic, cseSet, computeOnly,
1583 /* if the assignment & result is a temp */
1584 /* see if we can replace it */
1585 if (!computeOnly && ic->op == '=')
1588 /* update the spill location for this */
1589 updateSpillLocation (ic,0);
1591 if (POINTER_SET (ic) &&
1592 !(IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype)))
1595 applyToSetFTrue (cseSet, findCheaperOp, IC_RESULT (ic), &pdop, 0);
1596 if (pdop && !computeOnly &&
1597 IS_ITEMP (pdop) && IS_PTR(operandType(pdop)))
1598 ReplaceOpWithCheaperOp (&IC_RESULT(ic), pdop);
1602 checkSign = isSignedOp(ic);
1604 /* do the operand lookup i.e. for both the */
1605 /* right & left operand : check the cseSet */
1606 /* to see if they have been replaced if yes */
1607 /* then replace them with those from cseSet */
1609 /* and left is a symbol */
1610 if (IS_SYMOP (IC_LEFT (ic)) &&
1611 !computeOnly && ic->op != ADDRESS_OF)
1615 applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, checkSign);
1618 if (POINTER_GET (ic))
1620 if (IS_ITEMP (pdop) || IS_OP_LITERAL (pdop))
1622 /* some non dominating block does POINTER_SET with
1623 this variable .. unsafe to remove any POINTER_GETs */
1624 if (bitVectBitValue(ebb->ndompset,IC_LEFT(ic)->key))
1625 ebb->ptrsSet = bitVectSetBit(ebb->ptrsSet,pdop->key);
1626 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1629 /* check if there is a pointer set
1630 for the same pointer visible if yes
1631 then change this into an assignment */
1633 if (applyToSetFTrue (cseSet, findPointerSet, IC_LEFT (ic), &pdop, IC_RESULT (ic)) &&
1634 !bitVectBitValue (ebb->ptrsSet, pdop->key))
1637 IC_LEFT (ic) = NULL;
1638 ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
1639 SET_ISADDR (IC_RESULT (ic), 0);
1645 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1652 if (IS_SYMOP (IC_RIGHT (ic)) && !computeOnly)
1656 applyToSetFTrue (cseSet, findCheaperOp, IC_RIGHT (ic), &pdop, checkSign);
1658 ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
1663 /* if left or right changed then do algebraic */
1664 if (!computeOnly && change)
1667 while (constFold (ic, cseSet));
1670 /* if after all this it becomes an assignment to self
1671 then delete it and continue */
1672 if (ASSIGNMENT_TO_SELF (ic))
1674 remiCodeFromeBBlock (ebb, ic);
1678 /* now we will check to see if the entire */
1679 /* operation has been performed before */
1680 /* and is available */
1681 /* don't do assignments they will be killed */
1682 /* by dead code elimination if required do */
1683 /* it only if result is a temporary */
1685 if (!(POINTER_GET (ic) &&
1686 (IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype) ||
1687 isOperandVolatile (IC_LEFT (ic), TRUE) ||
1688 bitVectBitValue (ebb->ndompset, IC_LEFT (ic)->key))) &&
1690 IS_ITEMP (IC_RESULT (ic)) &&
1693 applyToSet (cseSet, findPrevIc, ic, &pdic);
1694 if (pdic && compareType (operandType (IC_RESULT (pdic)),
1695 operandType (IC_RESULT (ic))) != 1)
1697 if (pdic && port->cseOk && (*port->cseOk)(ic,pdic) == 0)
1701 /* Alternate code */
1702 if (pdic && IS_ITEMP(IC_RESULT(ic))) {
1703 if (POINTER_GET(ic) && bitVectBitValue(ebb->ptrsSet,IC_LEFT(ic)->key)) {
1704 /* Mmm, found an equivalent pointer get at a lower level.
1705 This could be a loop however with the same pointer set
1708 /* if previous definition found change this to an assignment */
1711 IC_RIGHT(ic) = operandFromOperand(IC_RESULT(pdic));
1712 SET_ISADDR(IC_RESULT(ic),0);
1713 SET_ISADDR(IC_RIGHT (ic),0);
1717 if (!(POINTER_SET (ic)) && IC_RESULT (ic)) {
1718 deleteItemIf (&cseSet, ifDefSymIsX, IC_RESULT (ic));
1719 addSetHead (&cseSet, newCseDef (IC_RESULT (ic), ic));
1723 /* if assignment to a parameter which is not
1724 mine and type is a pointer then delete
1725 pointerGets to take care of aliasing */
1726 if (ASSIGNMENT (ic) &&
1727 OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))) &&
1728 IS_PTR (operandType (IC_RESULT (ic))))
1730 deleteGetPointers (&cseSet, &ptrSetSet, IC_RIGHT (ic), ebb);
1731 for (i = 0; i < count; ebbs[i++]->visited = 0);
1732 applyToSet (ebb->succList, delGetPointerSucc, IC_RIGHT (ic), ebb->dfnum);
1733 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_RIGHT (ic)->key);
1736 /* if this is a pointerget then see if we can replace
1737 this with a previously assigned pointer value */
1738 if (POINTER_GET (ic) &&
1739 !(IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype) ||
1740 isOperandVolatile (IC_LEFT (ic), TRUE)))
1743 applyToSet (ptrSetSet, findPointerSet, IC_LEFT (ic), &pdop, IC_RESULT (ic));
1744 /* if we find it then locally replace all
1745 references to the result with what we assigned */
1748 replaceAllSymBySym (ic->next, IC_RESULT (ic), pdop, &ebb->ndompset);
1752 /* delete from the cseSet anything that has */
1753 /* operands matching the result of this */
1754 /* except in case of pointer access */
1755 if (!(POINTER_SET (ic)) && IC_RESULT (ic))
1757 deleteItemIf (&cseSet, ifOperandsHave, IC_RESULT (ic));
1758 /* delete any previous definitions */
1759 ebb->defSet = bitVectCplAnd (ebb->defSet, OP_DEFS (IC_RESULT (ic)));
1763 /* add the left & right to the defUse set */
1764 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)))
1766 OP_USES(IC_LEFT (ic))=
1767 bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1768 setUsesDefs (IC_LEFT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1772 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)))
1774 OP_USES(IC_RIGHT (ic))=
1775 bitVectSetBit (OP_USES (IC_RIGHT (ic)), ic->key);
1776 setUsesDefs (IC_RIGHT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1780 /* for the result it is special case, put the result */
1781 /* in the defuseSet if it a pointer or array access */
1782 if (POINTER_SET (defic))
1784 OP_USES(IC_RESULT (ic))=
1785 bitVectSetBit (OP_USES (IC_RESULT (ic)), ic->key);
1786 setUsesDefs (IC_RESULT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1787 deleteItemIf (&cseSet, ifPointerGet, IC_RESULT (ic));
1788 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_RESULT (ic)->key);
1789 /* delete from inexpressions of all successors which
1790 have dfNum > than this block */
1791 for (i = 0; i < count; ebbs[i++]->visited = 0);
1792 applyToSet (ebb->succList, delGetPointerSucc, IC_RESULT (ic), ebb->dfnum);
1794 /* delete from cseSet all other pointer sets
1796 deleteItemIf (&ptrSetSet, ifPointerSet, IC_RESULT (ic));
1797 /* add to the local pointerset set */
1798 addSetHead (&ptrSetSet, newCseDef (IC_RESULT (ic), ic));
1801 /* add the result to defintion set */ if (IC_RESULT (ic))
1803 OP_DEFS(IC_RESULT (ic))=
1804 bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1805 ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
1806 ebb->outDefs = bitVectCplAnd (ebb->outDefs, OP_DEFS (IC_RESULT (ic)));
1807 ebb->ldefs = bitVectSetBit (ebb->ldefs, ic->key);
1811 /* if this is an addressof instruction then */
1812 /* put the symbol in the address of list & */
1813 /* delete it from the cseSet */
1814 if (defic->op == ADDRESS_OF)
1816 addSetHead (&ebb->addrOf, IC_LEFT (ic));
1817 deleteItemIf (&cseSet, ifDefSymIsX, IC_LEFT (ic));
1821 setToNull ((void **) &ebb->outExprs);
1822 ebb->outExprs = cseSet;
1823 ebb->outDefs = bitVectUnion (ebb->outDefs, ebb->defSet);
1824 ebb->ptrsSet = bitVectUnion (ebb->ptrsSet, ebb->inPtrsSet);
1828 /*-----------------------------------------------------------------*/
1829 /* cseAllBlocks - will sequentially go thru & do cse for all blocks */
1830 /*-----------------------------------------------------------------*/
1832 cseAllBlocks (eBBlock ** ebbs, int count, int computeOnly)
1837 /* if optimization turned off */
1839 for (i = 0; i < count; i++)
1840 change += cseBBlock (ebbs[i], computeOnly, ebbs, count);