+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)
+{
+ 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)
+{
+ if (addPattern1(sic)) return 1;