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)));
833 if (IS_OP_LITERAL (IC_RIGHT (ic)))
836 if (operandLitValue (IC_RIGHT (ic)) == 0.0)
840 SET_RESULT_RIGHT (ic);
844 if (operandLitValue (IC_RIGHT (ic)) == 1.0)
846 /* '*' can have two unsigned chars as operands */
847 /* and an unsigned int as result. */
848 if (compareType (operandType (IC_RESULT (ic)),
849 operandType (IC_LEFT (ic))) == 1)
852 IC_RIGHT (ic) = IC_LEFT (ic);
854 SET_RESULT_RIGHT (ic);
862 IC_RIGHT (ic) = IC_LEFT (ic);
864 IC_LEFT (ic)->type = TYPE;
865 setOperandType (IC_LEFT (ic), operandType (IC_RESULT (ic)));
872 /* if division by self then 1 */
873 if (IC_LEFT (ic)->key == IC_RIGHT (ic)->key)
876 IC_RIGHT (ic) = operandFromLit (1);
878 IC_RESULT (ic) = operandFromOperand (IC_RESULT (ic));
879 IC_RESULT (ic)->isaddr = 0;
882 /* if this is a division then check if right */
883 /* is one then change it to an assignment */
884 if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
885 operandLitValue (IC_RIGHT (ic)) == 1.0)
889 IC_RIGHT (ic) = IC_LEFT (ic);
891 SET_RESULT_RIGHT (ic);
895 /* if both are the same for an comparison operators */
899 if (isOperandEqual (IC_LEFT (ic), IC_RIGHT (ic)))
902 IC_RIGHT (ic) = operandFromLit (1);
904 SET_RESULT_RIGHT (ic);
910 if (isOperandEqual (IC_LEFT (ic), IC_RIGHT (ic)))
913 IC_RIGHT (ic) = operandFromLit (0);
915 SET_RESULT_RIGHT (ic);
920 sym_link *otype = operandType(IC_RIGHT(ic));
921 sym_link *ctype = operandType(IC_LEFT(ic));
922 /* if this is a cast of a literal value */
923 if (IS_OP_LITERAL (IC_RIGHT (ic)) &&
924 !(IS_GENPTR(ctype) && (IS_PTR(otype) && !IS_GENPTR(otype)))) {
927 operandFromValue (valCastLiteral (operandType (IC_LEFT (ic)),
928 operandLitValue (IC_RIGHT (ic))));
930 SET_ISADDR (IC_RESULT (ic), 0);
932 /* if casting to the same */
933 if (compareType (operandType (IC_RESULT (ic)),
934 operandType (IC_RIGHT (ic))) == 1) {
937 SET_ISADDR (IC_RESULT (ic), 0);
942 if (IS_OP_LITERAL (IC_LEFT (ic)))
946 (operandLitValue (IC_LEFT (ic)) == 0 ?
947 operandFromLit (1) : operandFromLit (0));
949 SET_ISADDR (IC_RESULT (ic), 0);
955 #define OTHERS_PARM(s) (s->_isparm && !s->ismyparm)
956 /*-----------------------------------------------------------------*/
957 /* updateSpillLocation - keeps track of register spill location */
958 /*-----------------------------------------------------------------*/
960 updateSpillLocation (iCode * ic, int induction)
964 if (POINTER_SET (ic))
970 /* for the form true_symbol := iTempNN */
971 if (ASSIGN_ITEMP_TO_SYM (ic) &&
972 !SPIL_LOC (IC_RIGHT (ic))) {
974 setype = getSpec (operandType (IC_RESULT (ic)));
976 if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
977 !IS_VOLATILE (setype) &&
978 !IN_FARSPACE (SPEC_OCLS (setype)) &&
979 !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
981 wassert(IS_SYMOP(IC_RESULT (ic)));
982 wassert(IS_SYMOP(IC_RIGHT (ic)));
983 SPIL_LOC (IC_RIGHT (ic)) =
984 IC_RESULT (ic)->operand.symOperand;
989 #if 0 /* this needs furthur investigation can save a lot of code */
990 if (ASSIGN_SYM_TO_ITEMP(ic) &&
991 !SPIL_LOC(IC_RESULT(ic))) {
992 if (!OTHERS_PARM (OP_SYMBOL (IC_RIGHT (ic))))
993 SPIL_LOC (IC_RESULT (ic)) =
994 IC_RIGHT (ic)->operand.symOperand;
997 if (ASSIGN_ITEMP_TO_ITEMP (ic)) {
999 if (!SPIL_LOC (IC_RIGHT (ic)) &&
1000 !bitVectBitsInCommon (OP_DEFS (IC_RIGHT (ic)), OP_USES (IC_RESULT (ic))) &&
1001 OP_SYMBOL (IC_RESULT (ic))->isreqv) {
1003 setype = getSpec (operandType (IC_RESULT (ic)));
1005 if (!OP_SYMBOL(IC_RIGHT (ic))->noSpilLoc &&
1006 !IS_VOLATILE (setype) &&
1007 !IN_FARSPACE (SPEC_OCLS (setype)) &&
1008 !OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))))
1010 SPIL_LOC (IC_RIGHT (ic)) =
1011 SPIL_LOC (IC_RESULT (ic));
1013 /* special case for inductions */
1015 OP_SYMBOL(IC_RIGHT(ic))->isreqv &&
1016 !OP_SYMBOL(IC_RESULT (ic))->noSpilLoc &&
1017 !SPIL_LOC(IC_RESULT(ic))) {
1018 SPIL_LOC (IC_RESULT (ic)) = SPIL_LOC (IC_RIGHT (ic));
1022 /*-----------------------------------------------------------------*/
1023 /* setUsesDef - sets the uses def bitvector for a given operand */
1024 /*-----------------------------------------------------------------*/
1026 setUsesDefs (operand * op, bitVect * bdefs,
1027 bitVect * idefs, bitVect ** oud)
1029 /* compute the definitions alive at this point */
1030 bitVect *adefs = bitVectUnion (bdefs, idefs);
1032 /* of these definitions find the ones that are */
1033 /* for this operand */
1034 adefs = bitVectIntersect (adefs, OP_DEFS (op));
1036 /* these are the definitions that this operand can use */
1037 op->usesDefs = adefs;
1039 /* the out defs is an union */
1040 *oud = bitVectUnion (*oud, adefs);
1043 /*-----------------------------------------------------------------*/
1044 /* unsetDefsAndUses - clear this operation for the operands */
1045 /*-----------------------------------------------------------------*/
1047 unsetDefsAndUses (iCode * ic)
1049 if (ic->op == JUMPTABLE)
1052 /* take away this definition from the def chain of the */
1053 /* result & take away from use set of the operands */
1056 /* turn off def set */
1057 if (IS_SYMOP (IC_RESULT (ic)))
1059 if (!POINTER_SET (ic))
1060 bitVectUnSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1062 bitVectUnSetBit (OP_USES (IC_RESULT (ic)), ic->key);
1064 /* turn off the useSet for the operands */
1065 if (IS_SYMOP (IC_LEFT (ic)))
1066 bitVectUnSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1068 if (IS_SYMOP (IC_RIGHT (ic)))
1069 bitVectUnSetBit (OP_USES (IC_RIGHT (ic)), ic->key);
1072 /* must be ifx turn off the use */ if (IS_SYMOP (IC_COND (ic)))
1073 bitVectUnSetBit (OP_USES (IC_COND (ic)), ic->key);
1076 /*-----------------------------------------------------------------*/
1077 /* ifxOptimize - changes ifx conditions if it can */
1078 /*-----------------------------------------------------------------*/
1080 ifxOptimize (iCode * ic, set * cseSet,
1082 eBBlock * ebb, int *change,
1083 eBBlock ** ebbs, int count)
1088 /* if the condition can be replaced */
1092 applyToSetFTrue (cseSet, findCheaperOp, IC_COND (ic), &pdop, 0);
1095 ReplaceOpWithCheaperOp(&IC_COND (ic), pdop);
1100 /* if the conditional is a literal then */
1101 if (IS_OP_LITERAL (IC_COND (ic)))
1104 if ((operandLitValue (IC_COND (ic)) != 0.0) && IC_TRUE (ic))
1107 /* change to a goto */
1109 IC_LABEL (ic) = IC_TRUE (ic);
1116 if (!operandLitValue (IC_COND (ic)) && IC_FALSE (ic))
1119 IC_LABEL (ic) = IC_FALSE (ic);
1125 /* then kill this if condition */
1126 remiCodeFromeBBlock (ebb, ic);
1130 /* now we need to recompute the control flow */
1131 /* since the control flow has changed */
1132 /* this is very expensive but it does not happen */
1133 /* too often, if it does happen then the user pays */
1135 computeControlFlow (ebbs, count, 1);
1136 if (!options.lessPedantic) {
1137 werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
1142 /* if there is only one successor and that successor
1143 is the same one we are conditionally going to then
1144 we can remove this conditional statement */
1145 label = (IC_TRUE (ic) ? IC_TRUE (ic) : IC_FALSE (ic));
1146 if (elementsInSet (ebb->succList) == 1 &&
1147 isinSet (ebb->succList, eBBWithEntryLabel (ebbs, label, count)))
1150 remiCodeFromeBBlock (ebb, ic);
1151 computeControlFlow (ebbs, count, 1);
1152 if (!options.lessPedantic) {
1153 werror (W_CONTROL_FLOW, ic->filename, ic->lineno);
1159 /* if it remains an IFX the update the use Set */
1160 OP_USES(IC_COND (ic))=bitVectSetBit (OP_USES (IC_COND (ic)), ic->key);
1161 setUsesDefs (IC_COND (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1165 /*-----------------------------------------------------------------*/
1166 /* diCodeForSym - finds the definiting instruction for a symbol */
1167 /*-----------------------------------------------------------------*/
1168 DEFSETFUNC (diCodeForSym)
1171 V_ARG (operand *, sym);
1172 V_ARG (iCode **, dic);
1174 /* if already found */
1178 /* if not if this is the defining iCode */
1179 if (sym->key == cdp->key)
1188 /*-----------------------------------------------------------------*/
1189 /* constFold - does some constant folding */
1190 /*-----------------------------------------------------------------*/
1192 constFold (iCode * ic, set * cseSet)
1196 /* this routine will change
1202 /* deal with only + & - */
1203 if (ic->op != '+' &&
1207 /* this check is a hueristic to prevent live ranges
1208 from becoming too long */
1209 if (IS_PTR (operandType (IC_RESULT (ic))))
1212 /* check if operation with a literal */
1213 if (!IS_OP_LITERAL (IC_RIGHT (ic)))
1216 /* check if we can find a definition for the
1218 if (!(applyToSet (cseSet, diCodeForSym, IC_LEFT (ic), &dic)))
1221 /* check that this is also a +/- */
1222 if (dic->op != '+' && dic->op != '-')
1225 /* with a literal */
1226 if (!IS_OP_LITERAL (IC_RIGHT (dic)))
1229 /* find the definition of the left operand
1230 of dic.then check if this defined with a
1231 get_pointer return 0 if the pointer size is
1232 less than 2 (MCS51 specific) */
1233 if (!(applyToSet (cseSet, diCodeForSym, IC_LEFT (dic), &ldic)))
1236 if (POINTER_GET (ldic) && getSize (operandType (IC_LEFT (ldic))) <= 1)
1239 /* it is if the operations are the same */
1240 /* the literal parts need to be added */
1241 IC_LEFT (ic) = operandFromOperand (IC_LEFT (dic));
1242 if (ic->op == dic->op)
1243 IC_RIGHT (ic) = operandFromLit (operandLitValue (IC_RIGHT (ic)) +
1244 operandLitValue (IC_RIGHT (dic)));
1246 IC_RIGHT (ic) = operandFromLit (operandLitValue (IC_RIGHT (ic)) -
1247 operandLitValue (IC_RIGHT (dic)));
1249 if (IS_ITEMP (IC_RESULT (ic)))
1251 SPIL_LOC (IC_RESULT (ic)) = NULL;
1252 OP_SYMBOL(IC_RESULT (ic))->noSpilLoc = 1;
1259 /*-----------------------------------------------------------------*/
1260 /* deleteGetPointers - called when a pointer is passed as parm */
1261 /* will delete from cseSet all get pointers computed from this */
1262 /* pointer. A simple ifOperandsHave is not good enough here */
1263 /*-----------------------------------------------------------------*/
1265 deleteGetPointers (set ** cseSet, set ** pss, operand * op, eBBlock * ebb)
1267 set *compItems = NULL;
1272 if (!*cseSet && !*pss)
1275 /* first find all items computed from this operand .
1276 This done fairly simply go thru the list and find
1277 those that are computed by arthimetic with this
1279 for (cdp = setFirstItem (*cseSet); cdp; cdp = setNextItem (*cseSet))
1281 if (IS_ARITHMETIC_OP (cdp->diCode))
1283 if (isOperandEqual (IC_LEFT (cdp->diCode), op) ||
1284 isOperandEqual (IC_RIGHT (cdp->diCode), op))
1286 /* save it in our list of items */
1287 addSet (&compItems, IC_RESULT (cdp->diCode));
1289 /* also check for those computed from our computed
1290 list . This will take care of situations like
1291 iTemp1 = iTemp0 + 8;
1292 iTemp2 = iTemp1 + 8; */
1293 if (isinSetWith (compItems, (void*)IC_LEFT (cdp->diCode),
1294 (insetwithFunc)isOperandEqual) ||
1295 isinSetWith (compItems, (void*)IC_RIGHT (cdp->diCode),
1296 (insetwithFunc)isOperandEqual))
1298 addSet (&compItems, IC_RESULT (cdp->diCode));
1303 /* now delete all pointer gets with this op */
1304 deleteItemIf (cseSet, ifPointerGet, op);
1305 deleteItemIf (pss, ifPointerSet, op);
1307 /* set the bit vector used by dataFlow computation later */
1308 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, op->key);
1309 /* now for the computed items */
1310 for (cop = setFirstItem (compItems); cop; cop = setNextItem (compItems))
1312 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, cop->key);
1313 deleteItemIf (cseSet, ifPointerGet, cop);
1314 deleteItemIf (pss, ifPointerSet, cop);
1318 /*-----------------------------------------------------------------*/
1319 /* delGetPointerSucc - delete get pointer from inExprs of succ with */
1320 /* dfnum > supplied */
1321 /*-----------------------------------------------------------------*/
1322 DEFSETFUNC (delGetPointerSucc)
1324 eBBlock *ebp = item;
1325 V_ARG (operand *, op);
1332 if (ebp->dfnum > dfnum)
1334 deleteItemIf (&ebp->inExprs, ifPointerGet, op);
1337 return applyToSet (ebp->succList, delGetPointerSucc, op, dfnum);
1340 /*-----------------------------------------------------------------*/
1341 /* fixUpTypes - KLUGE HACK fixup a lowering problem */
1342 /*-----------------------------------------------------------------*/
1344 fixUpTypes (iCode * ic)
1346 sym_link *t1 = operandType (IC_LEFT (ic)), *t2;
1348 /* if (TARGET_IS_DS390) */
1349 if (options.model == MODEL_FLAT24)
1355 /* for pointer_gets if the types of result & left r the
1356 same then change it type of result to next */
1358 compareType (t2 = operandType (IC_RESULT (ic)), t1) == 1)
1360 setOperandType (IC_RESULT (ic), t2->next);
1364 /*-----------------------------------------------------------------*/
1365 /* isSignedOp - will return 1 if sign is important to operation */
1366 /*-----------------------------------------------------------------*/
1367 static int isSignedOp (iCode *ic)
1388 case GET_VALUE_AT_ADDRESS:
1414 /*-----------------------------------------------------------------*/
1415 /* cseBBlock - common subexpression elimination for basic blocks */
1416 /* this is the hackiest kludgiest routine in the whole */
1417 /* system. also the most important, since almost all */
1418 /* data flow related information is computed by it */
1419 /*-----------------------------------------------------------------*/
1421 cseBBlock (eBBlock * ebb, int computeOnly,
1422 eBBlock ** ebbs, int count)
1428 set *ptrSetSet = NULL;
1430 /* if this block is not reachable */
1434 /* set of common subexpressions */
1435 cseSet = setFromSet (ebb->inExprs);
1437 /* these will be computed by this routine */
1438 setToNull ((void **) &ebb->outDefs);
1439 setToNull ((void **) &ebb->defSet);
1440 setToNull ((void **) &ebb->usesDefs);
1441 setToNull ((void **) &ebb->ptrsSet);
1442 setToNull ((void **) &ebb->addrOf);
1443 setToNull ((void **) &ebb->ldefs);
1445 ebb->outDefs = bitVectCopy (ebb->inDefs);
1446 bitVectDefault = iCodeKey;
1447 ebb->defSet = newBitVect (iCodeKey);
1448 ebb->usesDefs = newBitVect (iCodeKey);
1450 /* for all the instructions in this block do */
1451 for (ic = ebb->sch; ic; ic = ic->next)
1458 ic->eBBlockNum = ebb->bbnum;
1463 /* if this is an assignment from true symbol
1464 to a temp then do pointer post inc/dec optimzation */
1465 if (ic->op == '=' && !POINTER_SET (ic) &&
1466 IS_PTR (operandType (IC_RESULT (ic))))
1468 ptrPostIncDecOpt (ic);
1471 /* clear the def & use chains for the operands involved */
1472 /* in this operation . since it can change due to opts */
1473 unsetDefsAndUses (ic);
1475 if (ic->op == PCALL || ic->op == CALL || ic->op == RECEIVE)
1477 /* add to defSet of the symbol */
1478 OP_DEFS(IC_RESULT (ic))=
1479 bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1480 /* add to the definition set of this block */
1481 ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
1482 ebb->ldefs = bitVectSetBit (ebb->ldefs, ic->key);
1483 ebb->outDefs = bitVectCplAnd (ebb->outDefs, OP_DEFS (IC_RESULT (ic)));
1484 setUsesDefs (IC_RESULT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1485 /* delete global variables from the cseSet
1486 since they can be modified by the function call */
1487 deleteItemIf (&cseSet, ifDefGlobal);
1489 /* and also itemps assigned from globals */
1490 deleteItemIf (&cseSet, ifAssignedFromGlobal);
1492 /* delete all getpointer iCodes from cseSet, this should
1493 be done only for global arrays & pointers but at this
1494 point we don't know if globals, so to be safe do all */
1495 deleteItemIf (&cseSet, ifAnyGetPointer);
1498 /* for pcall & ipush we need to add to the useSet */
1499 if ((ic->op == PCALL ||
1503 IS_SYMOP (IC_LEFT (ic)))
1506 /* check if they can be replaced */
1510 applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, 0);
1512 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1514 /* the lookup could have changed it */
1515 if (IS_SYMOP (IC_LEFT (ic)))
1517 OP_USES(IC_LEFT (ic))=
1518 bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1519 setUsesDefs (IC_LEFT (ic), ebb->defSet,
1520 ebb->outDefs, &ebb->usesDefs);
1524 /* if we a sending a pointer as a parameter
1525 then kill all cse since the pointed to item
1526 might be changed in the function being called */
1527 if ((ic->op == IPUSH || ic->op == SEND) &&
1528 IS_PTR (operandType (IC_LEFT (ic))))
1530 deleteGetPointers (&cseSet, &ptrSetSet, IC_LEFT (ic), ebb);
1531 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_LEFT (ic)->key);
1532 for (i = 0; i < count; ebbs[i++]->visited = 0);
1533 applyToSet (ebb->succList, delGetPointerSucc,
1534 IC_LEFT (ic), ebb->dfnum);
1539 /* if jumptable then mark the usage */
1540 if (ic->op == JUMPTABLE)
1542 OP_USES(IC_JTCOND (ic))=
1543 bitVectSetBit (OP_USES (IC_JTCOND (ic)), ic->key);
1544 setUsesDefs (IC_JTCOND (ic), ebb->defSet,
1545 ebb->outDefs, &ebb->usesDefs);
1553 /* do some algebraic optimizations if possible */
1555 while (constFold (ic, cseSet));
1559 if (POINTER_GET (ic) && !IS_PTR (operandType (IC_LEFT (ic))))
1561 setOperandType (IC_LEFT (ic),
1562 aggrToPtr (operandType (IC_LEFT (ic)), FALSE));
1566 if (POINTER_SET (ic) && !IS_PTR (operandType (IC_RESULT (ic))))
1568 setOperandType (IC_RESULT (ic),
1569 aggrToPtr (operandType (IC_RESULT (ic)), FALSE));
1572 /* if this is a condition statement then */
1573 /* check if the condition can be replaced */
1576 ifxOptimize (ic, cseSet, computeOnly,
1582 /* if the assignment & result is a temp */
1583 /* see if we can replace it */
1584 if (!computeOnly && ic->op == '=')
1587 /* update the spill location for this */
1588 updateSpillLocation (ic,0);
1590 if (POINTER_SET (ic) &&
1591 !(IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype)))
1594 applyToSetFTrue (cseSet, findCheaperOp, IC_RESULT (ic), &pdop, 0);
1595 if (pdop && !computeOnly &&
1596 IS_ITEMP (pdop) && IS_PTR(operandType(pdop)))
1597 ReplaceOpWithCheaperOp (&IC_RESULT(ic), pdop);
1601 checkSign = isSignedOp(ic);
1603 /* do the operand lookup i.e. for both the */
1604 /* right & left operand : check the cseSet */
1605 /* to see if they have been replaced if yes */
1606 /* then replace them with those from cseSet */
1608 /* and left is a symbol */
1609 if (IS_SYMOP (IC_LEFT (ic)) &&
1610 !computeOnly && ic->op != ADDRESS_OF)
1614 applyToSetFTrue (cseSet, findCheaperOp, IC_LEFT (ic), &pdop, checkSign);
1617 if (POINTER_GET (ic))
1619 if (IS_ITEMP (pdop) || IS_OP_LITERAL (pdop))
1621 /* some non dominating block does POINTER_SET with
1622 this variable .. unsafe to remove any POINTER_GETs */
1623 if (bitVectBitValue(ebb->ndompset,IC_LEFT(ic)->key))
1624 ebb->ptrsSet = bitVectSetBit(ebb->ptrsSet,pdop->key);
1625 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1628 /* check if there is a pointer set
1629 for the same pointer visible if yes
1630 then change this into an assignment */
1632 if (applyToSetFTrue (cseSet, findPointerSet, IC_LEFT (ic), &pdop, IC_RESULT (ic)) &&
1633 !bitVectBitValue (ebb->ptrsSet, pdop->key))
1636 IC_LEFT (ic) = NULL;
1637 ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
1638 SET_ISADDR (IC_RESULT (ic), 0);
1644 ReplaceOpWithCheaperOp(&IC_LEFT(ic), pdop);
1651 if (IS_SYMOP (IC_RIGHT (ic)) && !computeOnly)
1655 applyToSetFTrue (cseSet, findCheaperOp, IC_RIGHT (ic), &pdop, checkSign);
1657 ReplaceOpWithCheaperOp(&IC_RIGHT(ic), pdop);
1662 /* if left or right changed then do algebraic */
1663 if (!computeOnly && change)
1666 while (constFold (ic, cseSet));
1669 /* if after all this it becomes an assignment to self
1670 then delete it and continue */
1671 if (ASSIGNMENT_TO_SELF (ic))
1673 remiCodeFromeBBlock (ebb, ic);
1677 /* now we will check to see if the entire */
1678 /* operation has been performed before */
1679 /* and is available */
1680 /* don't do assignments they will be killed */
1681 /* by dead code elimination if required do */
1682 /* it only if result is a temporary */
1684 if (!(POINTER_GET (ic) &&
1685 (IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype) ||
1686 isOperandVolatile (IC_LEFT (ic), TRUE) ||
1687 bitVectBitValue (ebb->ndompset, IC_LEFT (ic)->key))) &&
1689 IS_ITEMP (IC_RESULT (ic)) &&
1692 applyToSet (cseSet, findPrevIc, ic, &pdic);
1693 if (pdic && compareType (operandType (IC_RESULT (pdic)),
1694 operandType (IC_RESULT (ic))) != 1)
1696 if (pdic && port->cseOk && (*port->cseOk)(ic,pdic) == 0)
1700 /* Alternate code */
1701 if (pdic && IS_ITEMP(IC_RESULT(ic))) {
1702 if (POINTER_GET(ic) && bitVectBitValue(ebb->ptrsSet,IC_LEFT(ic)->key)) {
1703 /* Mmm, found an equivalent pointer get at a lower level.
1704 This could be a loop however with the same pointer set
1707 /* if previous definition found change this to an assignment */
1710 IC_RIGHT(ic) = operandFromOperand(IC_RESULT(pdic));
1711 SET_ISADDR(IC_RESULT(ic),0);
1712 SET_ISADDR(IC_RIGHT (ic),0);
1716 if (!(POINTER_SET (ic)) && IC_RESULT (ic)) {
1717 deleteItemIf (&cseSet, ifDefSymIsX, IC_RESULT (ic));
1718 addSetHead (&cseSet, newCseDef (IC_RESULT (ic), ic));
1722 /* if assignment to a parameter which is not
1723 mine and type is a pointer then delete
1724 pointerGets to take care of aliasing */
1725 if (ASSIGNMENT (ic) &&
1726 OTHERS_PARM (OP_SYMBOL (IC_RESULT (ic))) &&
1727 IS_PTR (operandType (IC_RESULT (ic))))
1729 deleteGetPointers (&cseSet, &ptrSetSet, IC_RIGHT (ic), ebb);
1730 for (i = 0; i < count; ebbs[i++]->visited = 0);
1731 applyToSet (ebb->succList, delGetPointerSucc, IC_RIGHT (ic), ebb->dfnum);
1732 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_RIGHT (ic)->key);
1735 /* if this is a pointerget then see if we can replace
1736 this with a previously assigned pointer value */
1737 if (POINTER_GET (ic) &&
1738 !(IS_BITFIELD (OP_SYMBOL (IC_RESULT (ic))->etype) ||
1739 isOperandVolatile (IC_LEFT (ic), TRUE)))
1742 applyToSet (ptrSetSet, findPointerSet, IC_LEFT (ic), &pdop, IC_RESULT (ic));
1743 /* if we find it then locally replace all
1744 references to the result with what we assigned */
1747 replaceAllSymBySym (ic->next, IC_RESULT (ic), pdop, &ebb->ndompset);
1751 /* delete from the cseSet anything that has */
1752 /* operands matching the result of this */
1753 /* except in case of pointer access */
1754 if (!(POINTER_SET (ic)) && IC_RESULT (ic))
1756 deleteItemIf (&cseSet, ifOperandsHave, IC_RESULT (ic));
1757 /* delete any previous definitions */
1758 ebb->defSet = bitVectCplAnd (ebb->defSet, OP_DEFS (IC_RESULT (ic)));
1762 /* add the left & right to the defUse set */
1763 if (IC_LEFT (ic) && IS_SYMOP (IC_LEFT (ic)))
1765 OP_USES(IC_LEFT (ic))=
1766 bitVectSetBit (OP_USES (IC_LEFT (ic)), ic->key);
1767 setUsesDefs (IC_LEFT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1771 if (IC_RIGHT (ic) && IS_SYMOP (IC_RIGHT (ic)))
1773 OP_USES(IC_RIGHT (ic))=
1774 bitVectSetBit (OP_USES (IC_RIGHT (ic)), ic->key);
1775 setUsesDefs (IC_RIGHT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1779 /* for the result it is special case, put the result */
1780 /* in the defuseSet if it a pointer or array access */
1781 if (POINTER_SET (defic))
1783 OP_USES(IC_RESULT (ic))=
1784 bitVectSetBit (OP_USES (IC_RESULT (ic)), ic->key);
1785 setUsesDefs (IC_RESULT (ic), ebb->defSet, ebb->outDefs, &ebb->usesDefs);
1786 deleteItemIf (&cseSet, ifPointerGet, IC_RESULT (ic));
1787 ebb->ptrsSet = bitVectSetBit (ebb->ptrsSet, IC_RESULT (ic)->key);
1788 /* delete from inexpressions of all successors which
1789 have dfNum > than this block */
1790 for (i = 0; i < count; ebbs[i++]->visited = 0);
1791 applyToSet (ebb->succList, delGetPointerSucc, IC_RESULT (ic), ebb->dfnum);
1793 /* delete from cseSet all other pointer sets
1795 deleteItemIf (&ptrSetSet, ifPointerSet, IC_RESULT (ic));
1796 /* add to the local pointerset set */
1797 addSetHead (&ptrSetSet, newCseDef (IC_RESULT (ic), ic));
1800 /* add the result to defintion set */ if (IC_RESULT (ic))
1802 OP_DEFS(IC_RESULT (ic))=
1803 bitVectSetBit (OP_DEFS (IC_RESULT (ic)), ic->key);
1804 ebb->defSet = bitVectSetBit (ebb->defSet, ic->key);
1805 ebb->outDefs = bitVectCplAnd (ebb->outDefs, OP_DEFS (IC_RESULT (ic)));
1806 ebb->ldefs = bitVectSetBit (ebb->ldefs, ic->key);
1810 /* if this is an addressof instruction then */
1811 /* put the symbol in the address of list & */
1812 /* delete it from the cseSet */
1813 if (defic->op == ADDRESS_OF)
1815 addSetHead (&ebb->addrOf, IC_LEFT (ic));
1816 deleteItemIf (&cseSet, ifDefSymIsX, IC_LEFT (ic));
1820 setToNull ((void **) &ebb->outExprs);
1821 ebb->outExprs = cseSet;
1822 ebb->outDefs = bitVectUnion (ebb->outDefs, ebb->defSet);
1823 ebb->ptrsSet = bitVectUnion (ebb->ptrsSet, ebb->inPtrsSet);
1827 /*-----------------------------------------------------------------*/
1828 /* cseAllBlocks - will sequentially go thru & do cse for all blocks */
1829 /*-----------------------------------------------------------------*/
1831 cseAllBlocks (eBBlock ** ebbs, int count, int computeOnly)
1836 /* if optimization turned off */
1838 for (i = 0; i < count; i++)
1839 change += cseBBlock (ebbs[i], computeOnly, ebbs, count);