Ancestry.QueryProcessor.Compile.Emitter.EmitTupleEquality C# (CSharp) Method

        private static MethodBuilder EmitTupleEquality(TupleType tupleType, TypeBuilder typeBuilder, Dictionary<Name, FieldInfo> fieldsByID)
        {
            var equalityMethod = typeBuilder.DefineMethod("op_Equality", MethodAttributes.Static | MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig, CallingConventions.Standard, typeof(bool), new System.Type[] { typeBuilder, typeBuilder });
            var il = equalityMethod.GetILGenerator();
            var end = il.DefineLabel();
            foreach (var keyItem in tupleType.GetKeyAttributes())
            {
                var field = fieldsByID[keyItem];
                il.Emit(OpCodes.Ldarg_0);
                il.Emit(OpCodes.Ldfld, field);
                il.Emit(OpCodes.Ldarg_1);
                il.Emit(OpCodes.Ldfld, field);
                var fieldEqualityMethod = field.FieldType.GetMethod("op_Equality", new System.Type[] { field.FieldType, field.FieldType });
                if (fieldEqualityMethod != null)
                    il.EmitCall(OpCodes.Call, fieldEqualityMethod, null);
                else
                    il.Emit(OpCodes.Ceq);
                il.Emit(OpCodes.Dup);
                il.Emit(OpCodes.Brfalse_S, end);
                il.Emit(OpCodes.Pop);
            }
            il.Emit(OpCodes.Ldc_I4_1);	// True
            il.MarkLabel(end);
            il.Emit(OpCodes.Ret);
            return equalityMethod;
        }