+/* Search for the sequence
+ *
+ * jsr pushax
+ * lda xxx
+ * ldx yyy
+ * jsr tosaddax
+ *
+ * and replace it by
+ *
+ * clc
+ * adc xxx
+ * pha
+ * txa
+ * adc yyy
+ * tax
+ * pla
+ */
+{
+ unsigned Changes = 0;
+
+ /* Walk over the entries */
+ unsigned I = 0;
+ while (I < CS_GetEntryCount (S)) {
+
+ CodeEntry* L[4];
+
+ /* Get next entry */
+ L[0] = CS_GetEntry (S, I);
+
+ /* Check for the sequence */
+ if (CE_IsCallTo (L[0], "pushax") &&
+ CS_GetEntries (S, L+1, I+1, 3) &&
+ !CS_RangeHasLabel (S, I+1, 3) &&
+ L[1]->OPC == OP65_LDA &&
+ (L[1]->AM == AM65_ABS || L[1]->AM == AM65_ZP) &&
+ L[2]->OPC == OP65_LDX &&
+ (L[2]->AM == AM65_ABS || L[2]->AM == AM65_ZP) &&
+ CE_IsCallTo (L[3], "tosaddax")) {
+
+ CodeEntry* X;
+
+ /* Insert new code behind the sequence */
+ X = NewCodeEntry (OP65_CLC, AM65_IMP, 0, 0, L[3]->LI);
+ CS_InsertEntry (S, X, I+4);
+
+ /* adc xxx */
+ X = NewCodeEntry (OP65_ADC, L[1]->AM, L[1]->Arg, 0, L[3]->LI);
+ CS_InsertEntry (S, X, I+5);
+
+ /* pha */
+ X = NewCodeEntry (OP65_PHA, AM65_IMP, 0, 0, L[3]->LI);
+ CS_InsertEntry (S, X, I+6);
+
+ /* txa */
+ X = NewCodeEntry (OP65_TXA, AM65_IMP, 0, 0, L[3]->LI);
+ CS_InsertEntry (S, X, I+7);
+
+ /* adc yyy */
+ X = NewCodeEntry (OP65_ADC, L[2]->AM, L[2]->Arg, 0, L[3]->LI);
+ CS_InsertEntry (S, X, I+8);
+
+ /* tax */
+ X = NewCodeEntry (OP65_TAX, AM65_IMP, 0, 0, L[3]->LI);
+ CS_InsertEntry (S, X, I+9);
+
+ /* pla */
+ X = NewCodeEntry (OP65_PLA, AM65_IMP, 0, 0, L[3]->LI);
+ CS_InsertEntry (S, X, I+10);
+
+ /* Delete the old code */
+ CS_DelEntries (S, I, 4);
+
+ /* Remember, we had changes */
+ ++Changes;
+
+ }
+
+ /* Next entry */
+ ++I;
+
+ }
+
+ /* Return the number of changes made */
+ return Changes;
+}
+
+
+
+unsigned OptAdd4 (CodeSeg* S)
+/* Search for a call to incaxn and replace it by an 8 bit add if the X register
+ * is not used later.
+ */
+{
+ unsigned Changes = 0;
+
+ /* Walk over the entries */
+ unsigned I = 0;
+ while (I < CS_GetEntryCount (S)) {
+
+ CodeEntry* E;
+
+ /* Get next entry */
+ E = CS_GetEntry (S, I);
+
+ /* Check for the sequence */
+ if (E->OPC == OP65_JSR &&
+ strncmp (E->Arg, "incax", 5) == 0 &&
+ IsDigit (E->Arg[5]) &&
+ E->Arg[6] == '\0' &&
+ !RegXUsed (S, I+1)) {
+
+ CodeEntry* X;
+ const char* Arg;
+
+ /* Insert new code behind the sequence */
+ X = NewCodeEntry (OP65_CLC, AM65_IMP, 0, 0, E->LI);
+ CS_InsertEntry (S, X, I+1);
+
+ Arg = MakeHexArg (E->Arg[5] - '0');
+ X = NewCodeEntry (OP65_ADC, AM65_IMM, Arg, 0, E->LI);
+ CS_InsertEntry (S, X, I+2);
+
+ /* Delete the old code */
+ CS_DelEntry (S, I);
+
+ /* Remember, we had changes */
+ ++Changes;
+
+ }
+
+ /* Next entry */
+ ++I;
+
+ }
+
+ /* Return the number of changes made */
+ return Changes;
+}
+
+
+
+unsigned OptAdd5 (CodeSeg* S)