Clean up

src/main/java/chocopy/pa3/CodeGenImpl.java

@@ -631,12 +631,13 @@ public class CodeGenImpl extends CodeGenBase
                     {
                         backend.emitADDI(Register.A0,Register.A0, 1, "Increment by 1");
                         backend.emitSLT(Register.A0, Register.A0, Register.T0, comment);
-                    }   
+                    }
+                    /* Maybe NA 
                     else if(operator.equals("is"))
                     {
                         backend.emitXOR(Register.A0,  Register.A0, Register.T0, comment);
                         backend.emitSEQZ(Register.A0,  Register.A0, "Result is True if XOR equals 0");
-                    }
+                    }*/
                     else
                     {
                         backend.emitJAL(errorNI, "Operator not implemented for integer operands");
@@ -695,12 +696,13 @@ public class CodeGenImpl extends CodeGenBase
                     backend.emitLW(Register.T0, Register.FP, -sp_off*wordSize, "Pop stack slot "+sp_off);
                     backend.emitOR(Register.A0, Register.A0, Register.T0, "OR operation");
                     backend.emitLocalLabel(label, "Next step after OR");
-                }   
+                }
+                /*Maybe NA
                 else if(operator.equals("is"))
                 {
                     backend.emitXOR(Register.A0,  Register.A0, Register.T0, comment);
                     backend.emitSEQZ(Register.A0,  Register.A0, "Result is True if XOR equals 0");
-                }
+                }*/
                 else
                 {
                     backend.emitJAL(errorNI, "Operator not implemented for boolean operands");
@@ -727,6 +729,7 @@ public class CodeGenImpl extends CodeGenBase
                 sp_off -= 2;
                 backend.emitADDI(SP, FP, -sp_off*wordSize, "restore sp");
             }
+            // TODO: Implement "is" for objects
             else
             {
                 backend.emitJAL(errorNI, "Operator not implemented");