/*-----------------------------------------------------------------------*/
/* findPointerGetSet - find the pointer get or set for a operand */
/*-----------------------------------------------------------------------*/
-static iCode *findPointerGetSet(iCode *sic,operand *op)
+static iCode *
+findPointerGetSet (iCode * sic, operand * op)
{
- iCode *ic = sic;
+ iCode *ic = sic;
- for (; ic ; ic = ic->next) {
- if ((POINTER_SET(ic) && isOperandEqual(op,IC_RESULT(ic))) ||
- (POINTER_GET(ic) && isOperandEqual(op,IC_LEFT(ic))))
- return ic;
+ for (; ic; ic = ic->next)
+ {
+ if ((POINTER_SET (ic) && isOperandEqual (op, IC_RESULT (ic))) ||
+ (POINTER_GET (ic) && isOperandEqual (op, IC_LEFT (ic))))
+ return ic;
- /* if we find any other usage or definition of op null */
- if (IC_RESULT(ic) && isOperandEqual(IC_RESULT(ic),op))
- return NULL;
+ /* if we find any other usage or definition of op null */
+ if (IC_RESULT (ic) && isOperandEqual (IC_RESULT (ic), op))
+ return NULL;
- if (IC_RIGHT(ic) && isOperandEqual(IC_RIGHT(ic),op))
- return NULL;
-
- if (IC_LEFT(ic) && isOperandEqual(IC_LEFT(ic),op))
- return NULL;
+ if (IC_RIGHT (ic) && isOperandEqual (IC_RIGHT (ic), op))
+ return NULL;
+
+ if (IC_LEFT (ic) && isOperandEqual (IC_LEFT (ic), op))
+ return NULL;
}
- return NULL;
+ return NULL;
+}
+
+static int pattern1 (iCode *sic)
+{
+ /* this is what we do. look for sequences like
+
+ iTempX := _SOME_POINTER_;
+ iTempY := _SOME_POINTER_ + nn ; nn = sizeof (pointed to object) sic->next
+ _SOME_POINTER_ := iTempY; sic->next->next
+ either
+ iTempZ := @[iTempX]; sic->next->next->next
+ or
+ *(iTempX) := ..something.. sic->next->next->next
+ if we find this then transform this to
+ iTempX := _SOME_POINTER_;
+ either
+ iTempZ := @[iTempX];
+ or
+ *(iTempX) := ..something..
+ iTempY := _SOME_POINTER_ + nn ; nn = sizeof (pointed to object)
+ _SOME_POINTER_ := iTempY; */
+
+ /* sounds simple enough so lets start , here I use -ve
+ tests all the way to return if any test fails */
+ iCode *pgs, *sh, *st;
+
+ if (!(sic->next && sic->next->next && sic->next->next->next))
+ return 0;
+ if (sic->next->op != '+' && sic->next->op != '-')
+ return 0;
+ if (!(sic->next->next->op == '=' &&
+ !POINTER_SET (sic->next->next)))
+ return 0;
+ if (!isOperandEqual (IC_LEFT (sic->next), IC_RIGHT (sic)) ||
+ !IS_OP_LITERAL (IC_RIGHT (sic->next)))
+ return 0;
+ if (operandLitValue (IC_RIGHT (sic->next)) !=
+ getSize (operandType (IC_RIGHT (sic))->next))
+ return 0;
+ if (!isOperandEqual (IC_RESULT (sic->next->next),
+ IC_RIGHT (sic)))
+ return 0;
+ if (!isOperandEqual (IC_RESULT (sic->next), IC_RIGHT (sic->next->next)))
+ return 0;
+ if (!(pgs = findPointerGetSet (sic->next->next, IC_RESULT (sic))))
+ return 0;
+
+ /* found the patter .. now do the transformation */
+ sh = sic->next;
+ st = sic->next->next;
+
+ /* take the two out of the chain */
+ sic->next = st->next;
+ st->next->prev = sic;
+
+ /* and put them after the pointer get/set icode */
+ if ((st->next = pgs->next))
+ st->next->prev = st;
+ pgs->next = sh;
+ sh->prev = pgs;
+ return 1;
+}
+
+static int pattern2 (iCode *sic)
+{
+ /* this is what we do. look for sequences like
+
+ iTempX := _SOME_POINTER_;
+ iTempY := _SOME_POINTER_ + nn ; nn = sizeof (pointed to object) sic->next
+ iTempK := iTempY; sic->next->next
+ _SOME_POINTER_ := iTempK; sic->next->next->next
+ either
+ iTempZ := @[iTempX]; sic->next->next->next->next
+ or
+ *(iTempX) := ..something.. sic->next->next->next->next
+ if we find this then transform this to
+ iTempX := _SOME_POINTER_;
+ either
+ iTempZ := @[iTempX];
+ or
+ *(iTempX) := ..something..
+ iTempY := _SOME_POINTER_ + nn ; nn = sizeof (pointed to object)
+ iTempK := iTempY;
+ _SOME_POINTER_ := iTempK; */
+
+ /* sounds simple enough so lets start , here I use -ve
+ tests all the way to return if any test fails */
+ iCode *pgs, *sh, *st;
+
+ if (!(sic->next && sic->next->next && sic->next->next->next &&
+ sic->next->next->next->next))
+ return 0;
+
+ /* yes I can OR them together and make one large if... but I have
+ simple mind and like to keep things simple & readable */
+ if (!(sic->next->op == '+' || sic->next->op == '-')) return 0;
+ if (!isOperandEqual(IC_RIGHT(sic),IC_LEFT(sic->next))) return 0;
+ if (!IS_OP_LITERAL (IC_RIGHT (sic->next))) return 0;
+ if (operandLitValue (IC_RIGHT (sic->next)) !=
+ getSize (operandType (IC_RIGHT (sic))->next)) return 0;
+ if (!IS_ASSIGN_ICODE(sic->next->next)) return 0;
+ if (!isOperandEqual(IC_RIGHT(sic->next->next),IC_RESULT(sic->next))) return 0;
+ if (!IS_ASSIGN_ICODE(sic->next->next->next)) return 0;
+ if (!isOperandEqual(IC_RIGHT(sic->next->next->next),IC_RESULT(sic->next->next))) return 0;
+ if (!isOperandEqual(IC_RESULT(sic->next->next->next),IC_LEFT(sic->next))) return 0;
+ if (!(pgs = findPointerGetSet (sic->next->next->next, IC_RESULT (sic)))) return 0;
+
+ /* found the patter .. now do the transformation */
+ sh = sic->next;
+ st = sic->next->next->next;
+
+ /* take the three out of the chain */
+ sic->next = st->next;
+ st->next->prev = sic;
+
+ /* and put them after the pointer get/set icode */
+ if ((st->next = pgs->next))
+ st->next->prev = st;
+ pgs->next = sh;
+ sh->prev = pgs;
+ return 1;
}
/*-----------------------------------------------------------------------*/
/* ptrPostIncDecOpts - will do some pointer post increment optimizations */
/* this will help register allocation amongst others */
/*-----------------------------------------------------------------------*/
-void ptrPostIncDecOpt (iCode *sic)
+void
+ptrPostIncDecOpt (iCode * sic)
+{
+ if (pattern1(sic)) return ;
+ pattern2(sic);
+}
+
+/*-----------------------------------------------------------------------*/
+/* addPattern1 - transform addition to pointer of variables */
+/*-----------------------------------------------------------------------*/
+static int addPattern1(iCode *ic)
+{
+ iCode *dic;
+ operand *tmp;
+ /* transform :
+ iTempAA = iTempBB + iTempCC
+ iTempDD = iTempAA + CONST
+ to
+ iTempAA = iTempBB + CONST
+ iTempDD = iTempAA + iTempCC
+ */
+ if (!isOperandLiteral(IC_RIGHT(ic))) return 0;
+ if ((dic=findBackwardDef(IC_LEFT(ic),ic->prev)) == NULL) return 0;
+ if (bitVectnBitsOn(OP_SYMBOL(IC_RESULT(dic))->uses) > 1) return 0;
+ if (dic->op != '+') return 0;
+ tmp = IC_RIGHT(ic);
+ IC_RIGHT(ic) = IC_RIGHT(dic);
+ IC_RIGHT(dic) = tmp;
+ return 1;
+}
+
+/*-----------------------------------------------------------------------*/
+/* ptrAddition - optimize pointer additions */
+/*-----------------------------------------------------------------------*/
+int ptrAddition (iCode *sic)
{
- /* this is what we do. look for sequences like
-
- iTempX := _SOME_POINTER_;
- iTempY := _SOME_POINTER_ + nn ; nn = sizeof (pointed to object)
- _SOME_POINTER_ := iTempY;
- either
- iTempZ := @[iTempX];
- or
- *(iTempX) := ..something..
- if we find this then transform this to
- iTempX := _SOME_POINTER_;
- either
- iTempZ := @[iTempX];
- or
- *(iTempX) := ..something..
- iTempY := _SOME_POINTER_ + nn ; nn = sizeof (pointed to object)
- _SOME_POINTER_ := iTempY; */
-
- /* sounds simple enough so lets start , here I use -ve
- tests all the way to return if any test fails */
- iCode *pgs, *sh,*st;
-
- if (!( sic->next && sic->next->next && sic->next->next->next))
- return ;
- if (sic->next->op != '+' && sic->next->op != '-') return;
- if (!(sic->next->next->op == '=' &&
- !POINTER_SET(sic->next->next))) return;
- if (!isOperandEqual(IC_LEFT(sic->next),IC_RIGHT(sic)) ||
- !IS_OP_LITERAL(IC_RIGHT(sic->next)) ) return;
- if (operandLitValue(IC_RIGHT(sic->next)) !=
- getSize(operandType(IC_RIGHT(sic))->next)) return;
- if (!isOperandEqual(IC_RESULT(sic->next->next),
- IC_RIGHT(sic))) return;
- if (!isOperandEqual(IC_RESULT(sic->next),IC_RIGHT(sic->next->next))) return;
- if (!(pgs = findPointerGetSet(sic->next->next,IC_RESULT(sic))))
- return;
-
- /* found the patter .. now do the transformation */
- sh = sic->next; st = sic->next->next ;
-
- /* take the two out of the chain */
- sic->next = st->next;
- st->next->prev = sic;
-
- /* and put them after the pointer get/set icode */
- if ((st->next = pgs->next))
- st->next->prev = st;
- pgs->next = sh;
- sh->prev = pgs;
-
+ if (addPattern1(sic)) return 1;
+ return 0;
}
projects / fw / sdcc / blobdiff