minor fixes

lib/arm/translator.rb

@@ -130,6 +130,10 @@ module Arm
       ArmMachine.beq( code.label.to_cpu(self) )
     end
 
+    def translate_IsNotZero( code )
+      ArmMachine.bne( code.label.to_cpu(self) )
+    end
+
     def translate_IsOverflow( code )
       ArmMachine.bvs( code.label.to_cpu(self))
     end

lib/risc/instruction.rb

@@ -45,7 +45,7 @@ module Risc
     end
     def source_mini
       return "(no source)" unless source
-      return "(from: #{source[0..25]})" if source.is_a?(String)
+      return "(from: #{source[0..35]})" if source.is_a?(String)
       "(from: #{source.class.name.split("::").last})"
     end
   end

lib/risc/interpreter.rb

@@ -79,6 +79,7 @@ module Risc
       end
       return if old === val
       reg = reg.symbol if reg.is_a? Risc::RiscValue
+      val = Parfait.object_space.nil_object if( val == nil) #because that's what real code has
       @registers[reg] = val
       trigger(:register_changed, reg ,  old , val)
     end

lib/risc/method_compiler.rb

@@ -93,7 +93,7 @@ module Risc
     # for computationally building code (ie writing assembler) these short cuts
     # help to instantiate risc instructions and add them immediately
     [:label, :reg_to_slot , :slot_to_reg , :load_constant, :load_data,
-      :function_return , :function_call,
+      :function_return , :function_call, :op ,
       :transfer , :reg_to_slot , :byte_to_reg , :reg_to_byte].each do |method|
       define_method("add_#{method}".to_sym) do |*args|
         add_code Risc.send( method , *args )