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);
954 if (IS_OP_LITERAL (IC_LEFT (ic)))
956 /* if BITWISEAND then check if one of them is a zero */
957 /* if yes turn it into 0 assignment */
958 if (operandLitValue (IC_LEFT (ic)) == 0.0)
960 if (IS_OP_VOLATILE (IC_RIGHT (ic)))
963 IC_RIGHT (ic) = IC_LEFT (ic);
965 SET_RESULT_RIGHT (ic);
968 /* if BITWISEAND then check if one of them is 0xff... */
969 /* if yes turn it into assignment */
970 if (operandLitValue (IC_LEFT (ic)) == -1.0)
974 SET_RESULT_RIGHT (ic);
978 if (IS_OP_LITERAL (IC_RIGHT (ic)))
980 /* if BITWISEAND then check if one of them is a zero */
981 /* if yes turn it into 0 assignment */
982 if (operandLitValue (IC_RIGHT (ic)) == 0.0)
984 if (IS_OP_VOLATILE (IC_LEFT (ic)))
988 SET_RESULT_RIGHT (ic);
991 /* if BITWISEAND then check if one of them is 0xff... */
992 /* if yes turn it into assignment */
993 if (operandLitValue (IC_RIGHT (ic)) == -1.0)
996 IC_RIGHT (ic) = IC_LEFT (ic);
998 SET_RESULT_RIGHT (ic);
1004 if (IS_OP_LITERAL (IC_LEFT (ic)))
1006 /* if BITWISEOR then check if one of them is a zero */
1007 /* if yes turn it into assignment */
1008 if (operandLitValue (IC_LEFT (ic)) == 0.0)
1011 IC_LEFT (ic) = NULL;
1012 SET_RESULT_RIGHT (ic);
1015 /* if BITWISEOR then check if one of them is 0xff... */
1016 /* if yes turn it into 0xff... assignment */
1017 if (operandLitValue (IC_LEFT (ic)) == -1.0)
1020 IC_RIGHT (ic) = IC_LEFT (ic);
1021 IC_LEFT (ic) = NULL;
1022 SET_RESULT_RIGHT (ic);
1026 if (IS_OP_LITERAL (IC_RIGHT (ic)))
1028 /* if BITWISEOR then check if one of them is a zero */
1029 /* if yes turn it into assignment */
1030 if (operandLitValue (IC_RIGHT (ic)) == 0.0)
1033 IC_RIGHT (ic) = IC_LEFT (ic);
1034 IC_LEFT (ic) = NULL;
1035 SET_RESULT_RIGHT (ic);
1038 /* if BITWISEOR then check if one of them is 0xff... */
1039 /* if yes turn it into 0xff... assignment */
1040 if (operandLitValue (IC_RIGHT (ic)) == -1.0)
1043 IC_LEFT (ic) = NULL;
1044 SET_RESULT_RIGHT (ic);
1050 /* if XOR then check if one of them is a zero */
1051 /* if yes turn it into assignment */
1052 if (IS_OP_LITERAL (IC_LEFT (ic)) &&
1053 operandLitValue (IC_LEFT (ic)) == 0.0)
1056 IC_LEFT (ic) = NULL;
1057 SET_RESULT_RIGHT (ic);
1060 if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
1061 operandLitValue (IC_RIGHT (ic)) == 0.0)
1064 IC_RIGHT (ic) = IC_LEFT (ic);
1065 IC_LEFT (ic) = NULL;
1066 SET_RESULT_RIGHT (ic);
1074 #define OTHERS_PARM(s) (s->_isparm && !s->ismyparm)
1075 /*-----------------------------------------------------------------*/
1076 /* updateSpillLocation - keeps track of register spill location */
1077 /*-----------------------------------------------------------------*/
1079 updateSpillLocation (iCode * ic, int induction)
1083 if (POINTER_SET (ic))
1089 /* for the form true_symbol := iTempNN */
1090 if (ASSIGN_ITEMP_TO_SYM (ic) &&
1091 !SPIL_LOC (IC_RIGHT (ic))) {
1093 setype = getSpec (operandType (IC_RESULT (ic)));
1095 if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
1096 !IS_VOLATILE (setype) &&
1097 !IN_FARSPACE (SPEC_OCLS (setype)) &&
1098 !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
1100 wassert(IS_SYMOP(IC_RESULT (ic)));
1101 wassert(IS_SYMOP(IC_RIGHT (ic)));
1102 SPIL_LOC (IC_RIGHT (ic)) =
1103 IC_RESULT (ic)->operand.symOperand;
1108 #if 0 /* this needs furthur investigation can save a lot of code */
1109 if (ASSIGN_SYM_TO_ITEMP(ic) &&
1110 !SPIL_LOC(IC_RESULT(ic))) {
1111 if (!OTHERS_PARM (OP_SYMBOL (IC_RIGHT (ic))))
1112 SPIL_LOC (IC_RESULT (ic)) =
1113 IC_RIGHT (ic)->operand.symOperand;
1116 if (ASSIGN_ITEMP_TO_ITEMP (ic)) {
1118 if (!SPIL_LOC (IC_RIGHT (ic)) &&
1119 !bitVectBitsInCommon (OP_DEFS (IC_RIGHT (ic)), OP_USES (IC_RESULT (ic))) &&
1120 OP_SYMBOL (IC_RESULT (ic))->isreqv) {
1122 setype = getSpec (operandType (IC_RESULT (ic)));
1124 if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
1125 !IS_VOLATILE (setype) &&
1126 !IN_FARSPACE (SPEC_OCLS (setype)) &&
1127 !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
1129 SPIL_LOC (IC_RIGHT (ic)) =
1130 SPIL_LOC (IC_RESULT (ic));
1132 /* special case for inductions */
1134 OP_SYMBOL(IC_RIGHT(ic))->isreqv &&
1135 !OP_SYMBOL(IC_RESULT (ic))->noSpilLoc &&
1136 !SPIL_LOC(IC_RESULT(ic))) {
1137 SPIL_LOC (IC_RESULT (ic)) = SPIL_LOC (IC_RIGHT (ic));
1141 /*-----------------------------------------------------------------*/
1142 /* setUsesDef - sets the uses def bitvector for a given operand */
1143 /*-----------------------------------------------------------------*/
1145 setUsesDefs (operand * op, bitVect * bdefs,
1146 bitVect * idefs, bitVect ** oud)
1148 /* compute the definitions alive at this point */
1149 bitVect *adefs = bitVectUnion (bdefs, idefs);
1151 /* of these definitions find the ones that are */
1152 /* for this operand */
1153 adefs = bitVectIntersect (adefs, OP_DEFS (op));
1155 /* these are the definitions that this operand can use */
1156 op->usesDefs = adefs;
1158 /* the out defs is an union */
1159 *oud = bitVectUnion (*oud, adefs);
1162 /*-----------------------------------------------------------------*/
1163 /* unsetDefsAndUses - clear this operation for the operands */
1164 /*-----------------------------------------------------------------*/
1166 unsetDefsAndUses (iCode * ic)
1168 if (ic->op == JUMPTABLE)
1171 /* take away this definition from the def chain of the */
1172 /* result & take away from use set of the operands */
1175 /* turn off def set */
1176 if (IS_SYMOP (IC_RESULT (ic)))
1178 if (!POINTER_SET (ic))
1179 bitVectUnSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1181 bitVectUnSetBit (OP_USES (IC_RESULT (ic)), ic->key);
1183 /* turn off the useSet for the operands */
1184 if (IS_SYMOP (IC_LEFT (ic)))
1185 bitVectUnSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1187 if (IS_SYMOP (IC_RIGHT (ic)))
1188 bitVectUnSetBit (OP_USES (IC_RIGHT (ic)), ic->key);
1191 /* must be ifx turn off the use */ if (IS_SYMOP (IC_COND (ic)))
1192 bitVectUnSetBit (OP_USES (IC_COND (ic)), ic->key);
1195 /*-----------------------------------------------------------------*/
1196 /* ifxOptimize - changes ifx conditions if it can */
1197 /*-----------------------------------------------------------------*/
1199 ifxOptimize (iCode * ic, set * cseSet,
1201 eBBlock * ebb, int *change,
1202 eBBlock ** ebbs, int count)
1207 /* if the condition can be replaced */
1211 applyToSetFTrue (cseSet, findCheaperOp, IC_COND (ic), &pdop, 0);
1214 ReplaceOpWithCheaperOp(&IC_COND (ic), pdop);
1219 /* if the conditional is a literal then */
1220 if (IS_OP_LITERAL (IC_COND (ic)))
1223 if ((operandLitValue (IC_COND (ic)) != 0.0) && IC_TRUE (ic))
1226 /* change to a goto */
1228 IC_LABEL (ic) = IC_TRUE (ic);
1235 if (!operandLitValue (IC_COND (ic)) && IC_FALSE (ic))
1238 IC_LABEL (ic) = IC_FALSE (ic);
1244 /* then kill this if condition */
1245 remiCodeFromeBBlock (ebb, ic);
1249 /* now we need to recompute the control flow */
1250 /* since the control flow has changed */
1251 /* this is very expensive but it does not happen */
1252 /* too often, if it does happen then the user pays */
1254 computeControlFlow (ebbs, count, 1);
1255 if (!options.lessPedantic) {
1256 werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
1261 /* if there is only one successor and that successor
1262 is the same one we are conditionally going to then
1263 we can remove this conditional statement */
1264 label = (IC_TRUE (ic) ? IC_TRUE (ic) : IC_FALSE (ic));
1265 if (elementsInSet (ebb->succList) == 1 &&
1266 isinSet (ebb->succList, eBBWithEntryLabel (ebbs, label, count)))
1269 remiCodeFromeBBlock (ebb, ic);
1270 computeControlFlow (ebbs, count, 1);
1271 if (!options.lessPedantic) {
1272 werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
1278 /* if it remains an IFX the update the use Set */
1279 OP_USES(IC_COND (ic))=bitVectSetBit (OP_USES (IC_COND (ic)), ic->key);
1280 setUsesDefs (IC_COND (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1284 /*-----------------------------------------------------------------*/
1285 /* diCodeForSym - finds the definiting instruction for a symbol */
1286 /*-----------------------------------------------------------------*/
1287 DEFSETFUNC (diCodeForSym)
1290 V_ARG (operand *, sym);
1291 V_ARG (iCode **, dic);
1293 /* if already found */
1297 /* if not if this is the defining iCode */
1298 if (sym->key == cdp->key)
1307 /*-----------------------------------------------------------------*/
1308 /* constFold - does some constant folding */
1309 /*-----------------------------------------------------------------*/
1311 constFold (iCode * ic, set * cseSet)
1315 /* this routine will change
1321 /* deal with only + & - */
1322 if (ic->op != '+' &&
1326 /* this check is a hueristic to prevent live ranges
1327 from becoming too long */
1328 if (IS_PTR (operandType (IC_RESULT (ic))))
1331 /* check if operation with a literal */
1332 if (!IS_OP_LITERAL (IC_RIGHT (ic)))
1335 /* check if we can find a definition for the
1337 if (!(applyToSet (cseSet, diCodeForSym, IC_LEFT (ic), &dic)))
1340 /* check that this is also a +/- */
1341 if (dic->op != '+' && dic->op != '-')
1344 /* with a literal */
1345 if (!IS_OP_LITERAL (IC_RIGHT (dic)))
1348 /* find the definition of the left operand
1349 of dic.then check if this defined with a
1350 get_pointer return 0 if the pointer size is
1351 less than 2 (MCS51 specific) */
1352 if (!(applyToSet (cseSet, diCodeForSym, IC_LEFT (dic), &ldic)))
1355 if (POINTER_GET (ldic) && getSize (operandType (IC_LEFT (ldic))) <= 1)
1358 /* it is if the operations are the same */
1359 /* the literal parts need to be added */
1360 IC_LEFT (ic) = operandFromOperand (IC_LEFT (dic));
1361 if (ic->op == dic->op)
1362 IC_RIGHT (ic) = operandFromLit (operandLitValue (IC_RIGHT (ic)) +
1363 operandLitValue (IC_RIGHT (dic)));
1365 IC_RIGHT (ic) = operandFromLit (operandLitValue (IC_RIGHT (ic)) -
1366 operandLitValue (IC_RIGHT (dic)));
1368 if (IS_ITEMP (IC_RESULT (ic)))
1370 SPIL_LOC (IC_RESULT (ic)) = NULL;
1371 OP_SYMBOL(IC_RESULT (ic))->noSpilLoc = 1;
1378 /*-----------------------------------------------------------------*/
1379 /* deleteGetPointers - called when a pointer is passed as parm */
1380 /* will delete from cseSet all get pointers computed from this */
1381 /* pointer. A simple ifOperandsHave is not good enough here */
1382 /*-----------------------------------------------------------------*/
1384 deleteGetPointers (set ** cseSet, set ** pss, operand * op, eBBlock * ebb)
1386 set *compItems = NULL;
1391 if (!*cseSet && !*pss)
1394 /* first find all items computed from this operand .
1395 This done fairly simply go thru the list and find
1396 those that are computed by arthimetic with this
1398 for (cdp = setFirstItem (*cseSet); cdp; cdp = setNextItem (*cseSet))
1400 if (IS_ARITHMETIC_OP (cdp->diCode))
1402 if (isOperandEqual (IC_LEFT (cdp->diCode), op) ||
1403 isOperandEqual (IC_RIGHT (cdp->diCode), op))
1405 /* save it in our list of items */
1406 addSet (&compItems, IC_RESULT (cdp->diCode));
1408 /* also check for those computed from our computed
1409 list . This will take care of situations like
1410 iTemp1 = iTemp0 + 8;
1411 iTemp2 = iTemp1 + 8; */
1412 if (isinSetWith (compItems, (void*)IC_LEFT (cdp->diCode),
1413 (insetwithFunc)isOperandEqual) ||
1414 isinSetWith (compItems, (void*)IC_RIGHT (cdp->diCode),
1415 (insetwithFunc)isOperandEqual))
1417 addSet (&compItems, IC_RESULT (cdp->diCode));
1422 /* now delete all pointer gets with this op */
1423 deleteItemIf (cseSet, ifPointerGet, op);
1424 deleteItemIf (pss, ifPointerSet, op);
1426 /* set the bit vector used by dataFlow computation later */
1427 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, op->key);
1428 /* now for the computed items */
1429 for (cop = setFirstItem (compItems); cop; cop = setNextItem (compItems))
1431 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, cop->key);
1432 deleteItemIf (cseSet, ifPointerGet, cop);
1433 deleteItemIf (pss, ifPointerSet, cop);
1437 /*-----------------------------------------------------------------*/
1438 /* delGetPointerSucc - delete get pointer from inExprs of succ with */
1439 /* dfnum > supplied */
1440 /*-----------------------------------------------------------------*/
1441 DEFSETFUNC (delGetPointerSucc)
1443 eBBlock *ebp = item;
1444 V_ARG (operand *, op);
1451 if (ebp->dfnum > dfnum)
1453 deleteItemIf (&ebp->inExprs, ifPointerGet, op);
1456 return applyToSet (ebp->succList, delGetPointerSucc, op, dfnum);
1459 /*-----------------------------------------------------------------*/
1460 /* fixUpTypes - KLUGE HACK fixup a lowering problem */
1461 /*-----------------------------------------------------------------*/
1463 fixUpTypes (iCode * ic)
1465 sym_link *t1 = operandType (IC_LEFT (ic)), *t2;
1467 /* if (TARGET_IS_DS390) */
1468 if (options.model == MODEL_FLAT24)
1474 /* for pointer_gets if the types of result & left r the
1475 same then change it type of result to next */
1477 compareType (t2 = operandType (IC_RESULT (ic)), t1) == 1)
1479 setOperandType (IC_RESULT (ic), t2->next);
1483 /*-----------------------------------------------------------------*/
1484 /* isSignedOp - will return 1 if sign is important to operation */
1485 /*-----------------------------------------------------------------*/
1486 static int isSignedOp (iCode *ic)
1507 case GET_VALUE_AT_ADDRESS:
1533 /*-----------------------------------------------------------------*/
1534 /* cseBBlock - common subexpression elimination for basic blocks */
1535 /* this is the hackiest kludgiest routine in the whole */
1536 /* system. also the most important, since almost all */
1537 /* data flow related information is computed by it */
1538 /*-----------------------------------------------------------------*/
1540 cseBBlock (eBBlock * ebb, int computeOnly,
1541 eBBlock ** ebbs, int count)
1547 set *ptrSetSet = NULL;
1549 /* if this block is not reachable */
1553 /* set of common subexpressions */
1554 cseSet = setFromSet (ebb->inExprs);
1556 /* these will be computed by this routine */
1557 setToNull ((void **) &ebb->outDefs);
1558 setToNull ((void **) &ebb->defSet);
1559 setToNull ((void **) &ebb->usesDefs);
1560 setToNull ((void **) &ebb->ptrsSet);
1561 setToNull ((void **) &ebb->addrOf);
1562 setToNull ((void **) &ebb->ldefs);
1564 ebb->outDefs = bitVectCopy (ebb->inDefs);
1565 bitVectDefault = iCodeKey;
1566 ebb->defSet = newBitVect (iCodeKey);
1567 ebb->usesDefs = newBitVect (iCodeKey);
1569 /* for all the instructions in this block do */
1570 for (ic = ebb->sch; ic; ic = ic->next)
1577 ic->eBBlockNum = ebb->bbnum;
1582 /* if this is an assignment from true symbol
1583 to a temp then do pointer post inc/dec optimzation */
1584 if (ic->op == '=' && !POINTER_SET (ic) &&
1585 IS_PTR (operandType (IC_RESULT (ic))))
1587 ptrPostIncDecOpt (ic);
1590 /* clear the def & use chains for the operands involved */
1591 /* in this operation . since it can change due to opts */
1592 unsetDefsAndUses (ic);
1594 if (ic->op == PCALL || ic->op == CALL || ic->op == RECEIVE)
1596 /* add to defSet of the symbol */
1597 OP_DEFS(IC_RESULT (ic))=
1598 bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1599 /* add to the definition set of this block */
1600 ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
1601 ebb->ldefs = bitVectSetBit (ebb->ldefs, ic->key);
1602 ebb->outDefs = bitVectCplAnd (ebb->outDefs, OP_DEFS (IC_RESULT (ic)));
1603 setUsesDefs (IC_RESULT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1604 /* delete global variables from the cseSet
1605 since they can be modified by the function call */
1606 deleteItemIf (&cseSet, ifDefGlobal);
1608 /* and also itemps assigned from globals */
1609 deleteItemIf (&cseSet, ifAssignedFromGlobal);
1611 /* delete all getpointer iCodes from cseSet, this should
1612 be done only for global arrays & pointers but at this
1613 point we don't know if globals, so to be safe do all */
1614 deleteItemIf (&cseSet, ifAnyGetPointer);
1617 /* for pcall & ipush we need to add to the useSet */
1618 if ((ic->op == PCALL ||
1622 IS_SYMOP (IC_LEFT (ic)))
1625 /* check if they can be replaced */
1629 applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, 0);
1631 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1633 /* the lookup could have changed it */
1634 if (IS_SYMOP (IC_LEFT (ic)))
1636 OP_USES(IC_LEFT (ic))=
1637 bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1638 setUsesDefs (IC_LEFT (ic), ebb->defSet,
1639 ebb->outDefs, &ebb->usesDefs);
1643 /* if we a sending a pointer as a parameter
1644 then kill all cse since the pointed to item
1645 might be changed in the function being called */
1646 if ((ic->op == IPUSH || ic->op == SEND) &&
1647 IS_PTR (operandType (IC_LEFT (ic))))
1649 deleteGetPointers (&cseSet, &ptrSetSet, IC_LEFT (ic), ebb);
1650 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_LEFT (ic)->key);
1651 for (i = 0; i < count; ebbs[i++]->visited = 0);
1652 applyToSet (ebb->succList, delGetPointerSucc,
1653 IC_LEFT (ic), ebb->dfnum);
1658 /* if jumptable then mark the usage */
1659 if (ic->op == JUMPTABLE)
1661 OP_USES(IC_JTCOND (ic))=
1662 bitVectSetBit (OP_USES (IC_JTCOND (ic)), ic->key);
1663 setUsesDefs (IC_JTCOND (ic), ebb->defSet,
1664 ebb->outDefs, &ebb->usesDefs);
1672 /* do some algebraic optimizations if possible */
1674 while (constFold (ic, cseSet));
1678 if (POINTER_GET (ic) && !IS_PTR (operandType (IC_LEFT (ic))))
1680 setOperandType (IC_LEFT (ic),
1681 aggrToPtr (operandType (IC_LEFT (ic)), FALSE));
1685 if (POINTER_SET (ic) && !IS_PTR (operandType (IC_RESULT (ic))))
1687 setOperandType (IC_RESULT (ic),
1688 aggrToPtr (operandType (IC_RESULT (ic)), FALSE));
1691 /* if this is a condition statement then */
1692 /* check if the condition can be replaced */
1695 ifxOptimize (ic, cseSet, computeOnly,
1701 /* if the assignment & result is a temp */
1702 /* see if we can replace it */
1703 if (!computeOnly && ic->op == '=')
1706 /* update the spill location for this */
1707 updateSpillLocation (ic,0);
1709 if (POINTER_SET (ic) &&
1710 !(IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype)))
1713 applyToSetFTrue (cseSet, findCheaperOp, IC_RESULT (ic), &pdop, 0);
1714 if (pdop && !computeOnly &&
1715 IS_ITEMP (pdop) && IS_PTR(operandType(pdop)))
1716 ReplaceOpWithCheaperOp (&IC_RESULT(ic), pdop);
1720 checkSign = isSignedOp(ic);
1722 /* do the operand lookup i.e. for both the */
1723 /* right & left operand : check the cseSet */
1724 /* to see if they have been replaced if yes */
1725 /* then replace them with those from cseSet */
1727 /* and left is a symbol */
1728 if (IS_SYMOP (IC_LEFT (ic)) &&
1729 !computeOnly && ic->op != ADDRESS_OF)
1733 applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, checkSign);
1736 if (POINTER_GET (ic))
1738 if (IS_ITEMP (pdop) || IS_OP_LITERAL (pdop))
1740 /* some non dominating block does POINTER_SET with
1741 this variable .. unsafe to remove any POINTER_GETs */
1742 if (bitVectBitValue(ebb->ndompset,IC_LEFT(ic)->key))
1743 ebb->ptrsSet = bitVectSetBit(ebb->ptrsSet,pdop->key);
1744 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1747 /* check if there is a pointer set
1748 for the same pointer visible if yes
1749 then change this into an assignment */
1751 if (applyToSetFTrue (cseSet, findPointerSet, IC_LEFT (ic), &pdop, IC_RESULT (ic)) &&
1752 !bitVectBitValue (ebb->ptrsSet, pdop->key))
1755 IC_LEFT (ic) = NULL;
1756 ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
1757 SET_ISADDR (IC_RESULT (ic), 0);
1763 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1770 if (IS_SYMOP (IC_RIGHT (ic)) && !computeOnly)
1774 applyToSetFTrue (cseSet, findCheaperOp, IC_RIGHT (ic), &pdop, checkSign);
1776 ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
1781 /* if left or right changed then do algebraic */
1782 if (!computeOnly && change)
1785 while (constFold (ic, cseSet));
1788 /* if after all this it becomes an assignment to self
1789 then delete it and continue */
1790 if (ASSIGNMENT_TO_SELF (ic))
1792 remiCodeFromeBBlock (ebb, ic);
1796 /* now we will check to see if the entire */
1797 /* operation has been performed before */
1798 /* and is available */
1799 /* don't do assignments they will be killed */
1800 /* by dead code elimination if required do */
1801 /* it only if result is a temporary */
1803 if (!(POINTER_GET (ic) &&
1804 (IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype) ||
1805 isOperandVolatile (IC_LEFT (ic), TRUE) ||
1806 bitVectBitValue (ebb->ndompset, IC_LEFT (ic)->key))) &&
1808 IS_ITEMP (IC_RESULT (ic)) &&
1811 applyToSet (cseSet, findPrevIc, ic, &pdic);
1812 if (pdic && compareType (operandType (IC_RESULT (pdic)),
1813 operandType (IC_RESULT (ic))) != 1)
1815 if (pdic && port->cseOk && (*port->cseOk)(ic,pdic) == 0)
1819 /* Alternate code */
1820 if (pdic && IS_ITEMP(IC_RESULT(ic))) {
1821 if (POINTER_GET(ic) && bitVectBitValue(ebb->ptrsSet,IC_LEFT(ic)->key)) {
1822 /* Mmm, found an equivalent pointer get at a lower level.
1823 This could be a loop however with the same pointer set
1826 /* if previous definition found change this to an assignment */
1829 IC_RIGHT(ic) = operandFromOperand(IC_RESULT(pdic));
1830 SET_ISADDR(IC_RESULT(ic),0);
1831 SET_ISADDR(IC_RIGHT (ic),0);
1835 if (!(POINTER_SET (ic)) && IC_RESULT (ic)) {
1836 deleteItemIf (&cseSet, ifDefSymIsX, IC_RESULT (ic));
1837 addSetHead (&cseSet, newCseDef (IC_RESULT (ic), ic));
1841 /* if assignment to a parameter which is not
1842 mine and type is a pointer then delete
1843 pointerGets to take care of aliasing */
1844 if (ASSIGNMENT (ic) &&
1845 OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))) &&
1846 IS_PTR (operandType (IC_RESULT (ic))))
1848 deleteGetPointers (&cseSet, &ptrSetSet, IC_RIGHT (ic), ebb);
1849 for (i = 0; i < count; ebbs[i++]->visited = 0);
1850 applyToSet (ebb->succList, delGetPointerSucc, IC_RIGHT (ic), ebb->dfnum);
1851 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_RIGHT (ic)->key);
1854 /* if this is a pointerget then see if we can replace
1855 this with a previously assigned pointer value */
1856 if (POINTER_GET (ic) &&
1857 !(IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype) ||
1858 isOperandVolatile (IC_LEFT (ic), TRUE)))
1861 applyToSet (ptrSetSet, findPointerSet, IC_LEFT (ic), &pdop, IC_RESULT (ic));
1862 /* if we find it then locally replace all
1863 references to the result with what we assigned */
1866 replaceAllSymBySym (ic->next, IC_RESULT (ic), pdop, &ebb->ndompset);
1870 /* delete from the cseSet anything that has */
1871 /* operands matching the result of this */
1872 /* except in case of pointer access */
1873 if (!(POINTER_SET (ic)) && IC_RESULT (ic))
1875 deleteItemIf (&cseSet, ifOperandsHave, IC_RESULT (ic));
1876 /* delete any previous definitions */
1877 ebb->defSet = bitVectCplAnd (ebb->defSet, OP_DEFS (IC_RESULT (ic)));
1881 /* add the left & right to the defUse set */
1882 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)))
1884 OP_USES(IC_LEFT (ic))=
1885 bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1886 setUsesDefs (IC_LEFT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1890 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)))
1892 OP_USES(IC_RIGHT (ic))=
1893 bitVectSetBit (OP_USES (IC_RIGHT (ic)), ic->key);
1894 setUsesDefs (IC_RIGHT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1898 /* for the result it is special case, put the result */
1899 /* in the defuseSet if it a pointer or array access */
1900 if (POINTER_SET (defic))
1902 OP_USES(IC_RESULT (ic))=
1903 bitVectSetBit (OP_USES (IC_RESULT (ic)), ic->key);
1904 setUsesDefs (IC_RESULT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1905 deleteItemIf (&cseSet, ifPointerGet, IC_RESULT (ic));
1906 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_RESULT (ic)->key);
1907 /* delete from inexpressions of all successors which
1908 have dfNum > than this block */
1909 for (i = 0; i < count; ebbs[i++]->visited = 0);
1910 applyToSet (ebb->succList, delGetPointerSucc, IC_RESULT (ic), ebb->dfnum);
1912 /* delete from cseSet all other pointer sets
1914 deleteItemIf (&ptrSetSet, ifPointerSet, IC_RESULT (ic));
1915 /* add to the local pointerset set */
1916 addSetHead (&ptrSetSet, newCseDef (IC_RESULT (ic), ic));
1919 /* add the result to defintion set */ if (IC_RESULT (ic))
1921 OP_DEFS(IC_RESULT (ic))=
1922 bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1923 ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
1924 ebb->outDefs = bitVectCplAnd (ebb->outDefs, OP_DEFS (IC_RESULT (ic)));
1925 ebb->ldefs = bitVectSetBit (ebb->ldefs, ic->key);
1929 /* if this is an addressof instruction then */
1930 /* put the symbol in the address of list & */
1931 /* delete it from the cseSet */
1932 if (defic->op == ADDRESS_OF)
1934 addSetHead (&ebb->addrOf, IC_LEFT (ic));
1935 deleteItemIf (&cseSet, ifDefSymIsX, IC_LEFT (ic));
1939 setToNull ((void **) &ebb->outExprs);
1940 ebb->outExprs = cseSet;
1941 ebb->outDefs = bitVectUnion (ebb->outDefs, ebb->defSet);
1942 ebb->ptrsSet = bitVectUnion (ebb->ptrsSet, ebb->inPtrsSet);
1946 /*-----------------------------------------------------------------*/
1947 /* cseAllBlocks - will sequentially go thru & do cse for all blocks */
1948 /*-----------------------------------------------------------------*/
1950 cseAllBlocks (eBBlock ** ebbs, int count, int computeOnly)
1955 /* if optimization turned off */
1957 for (i = 0; i < count; i++)
1958 change += cseBBlock (ebbs[i], computeOnly, ebbs, count);