diff --git a/lib/mom/builtin/comparison.rb b/lib/mom/builtin/comparison.rb
index d38335e9..c5f54f0f 100644
--- a/lib/mom/builtin/comparison.rb
+++ b/lib/mom/builtin/comparison.rb
@@ -12,7 +12,7 @@ module Mom
         builder.build do
           integer! << message[:receiver]
           integer.reduce_int
-          integer_reg! << message[:arg1] #"other" 
+          integer_reg! << message[:arg1] #"other"
           integer_reg.reduce_int
           swap_names(:integer , :integer_reg) if(operator.to_s.start_with?('<') )
           integer.op :- , integer_reg
@@ -28,6 +28,33 @@ module Mom
         return compiler
       end
     end
-
+  end
+  class Comparison < ::Mom::Instruction
+    attr_reader :operator
+    def initialize(name , operator)
+      super(name)
+      @operator = operator.value
+    end
+    def to_risc(compiler)
+      builder = compiler.builder(compiler.source)
+      operator = @operator # make accessible in block
+      builder.build do
+        integer! << message[:receiver]
+        integer.reduce_int
+        integer_reg! << message[:arg1] #"other"
+        integer_reg.reduce_int
+        swap_names(:integer , :integer_reg) if(operator.to_s.start_with?('<') )
+        integer.op :- , integer_reg
+        if_minus false_label
+        if_zero( false_label ) if operator.to_s.length == 1
+        object! << Parfait.object_space.true_object
+        branch merge_label
+        add_code false_label
+        object << Parfait.object_space.false_object
+        add_code merge_label
+        message[:return_value] << object
+      end
+      return compiler
+    end
   end
 end
diff --git a/lib/mom/builtin/div10.rb b/lib/mom/builtin/div10.rb
index 0d54736d..bf1e73d5 100644
--- a/lib/mom/builtin/div10.rb
+++ b/lib/mom/builtin/div10.rb
@@ -62,4 +62,65 @@ module Mom
       end
     end
   end
+  class Div10 < ::Mom::Instruction
+    def to_risc(compiler)
+      s = "div_10 "
+      builder = compiler.builder(compiler.source)
+      integer_tmp = builder.allocate_int
+      builder.build do
+        integer_self! << message[:receiver]
+        integer_self.reduce_int
+        integer_1! << integer_self
+        integer_reg! << integer_self
+
+        integer_const! << 1
+        integer_1.op :>> , integer_const
+
+        integer_const << 2
+        integer_reg.op :>> , integer_const
+        integer_reg.op :+ , integer_1
+
+        integer_const << 4
+        integer_1 << integer_reg
+        integer_reg.op :>> , integer_1
+
+        integer_reg.op :+ , integer_1
+
+        integer_const << 8
+        integer_1 << integer_reg
+        integer_1.op :>> , integer_const
+
+        integer_reg.op :+ , integer_1
+
+        integer_const << 16
+        integer_1 << integer_reg
+        integer_1.op :>> , integer_const
+
+        integer_reg.op :+ , integer_1
+
+        integer_const << 3
+        integer_reg.op :>> , integer_const
+
+        integer_const << 10
+        integer_1 << integer_reg
+        integer_1.op :* , integer_const
+
+        integer_self.op :- , integer_1
+        integer_1 << integer_self
+
+        integer_const << 6
+        integer_1.op :+ , integer_const
+
+        integer_const << 4
+        integer_1.op :>> , integer_const
+
+        integer_reg.op :+ , integer_1
+
+        integer_tmp[Parfait::Integer.integer_index] << integer_reg
+        message[:return_value] << integer_tmp
+
+      end
+      return compiler
+    end
+  end
 end
diff --git a/lib/mom/builtin/div4.rb b/lib/mom/builtin/div4.rb
index b41e04ea..79a2312a 100644
--- a/lib/mom/builtin/div4.rb
+++ b/lib/mom/builtin/div4.rb
@@ -16,4 +16,19 @@ module Mom
       end
     end
   end
+  class Div4 < ::Mom::Instruction
+    def to_risc(compiler)
+      builder = compiler.builder(compiler.source)
+      integer_tmp = builder.allocate_int
+      builder.build do
+        integer_self! << message[:receiver]
+        integer_self.reduce_int
+        integer_1! << 2
+        integer_self.op :>> , integer_1
+        integer_tmp[Parfait::Integer.integer_index] << integer_self
+        message[:return_value] << integer_tmp
+      end
+      return compiler
+    end
+  end
 end
diff --git a/lib/mom/builtin/integer.rb b/lib/mom/builtin/integer.rb
index 139b7297..01e7f06c 100644
--- a/lib/mom/builtin/integer.rb
+++ b/lib/mom/builtin/integer.rb
@@ -61,7 +61,7 @@ module Mom
         # - returns the new int
         def operator_method( op_sym )
           compiler = compiler_for(:Integer, op_sym ,{other: :Integer })
-          compiler.add_code Operator.new("operator" , op_sym)
+          compiler.add_code Operator.new( "op:#{op_sym}" , op_sym)
           return compiler
         end
 
diff --git a/lib/mom/builtin/operator.rb b/lib/mom/builtin/operator.rb
index 4c9be8ee..14ed57ae 100644
--- a/lib/mom/builtin/operator.rb
+++ b/lib/mom/builtin/operator.rb
@@ -23,13 +23,12 @@ module Mom
         return compiler
       end
     end
-
   end
   class IntOperator < Instruction
     attr_reader :operator
     def initialize(name , operator)
       super(name)
-      @operator = operator
+      @operator = operator.value
     end
 
     def to_risc(compiler)
diff --git a/lib/risc/instructions/operator_instruction.rb b/lib/risc/instructions/operator_instruction.rb
index 9a12218b..0afeb7b1 100644
--- a/lib/risc/instructions/operator_instruction.rb
+++ b/lib/risc/instructions/operator_instruction.rb
@@ -13,8 +13,9 @@ module Risc
   class OperatorInstruction < Instruction
     def initialize( source , operator , left , right )
       super(source)
+      operator = operator.value if operator.is_a?(Vool::Constant)
       @operator = operator
-      raise "unsuported operator :#{operator}:" unless Risc.operators.include?(operator)
+      raise "unsuported operator :#{operator}:#{operator.class}:" unless Risc.operators.include?(operator)
       @left = left
       @right = right
       raise "Not register #{left}" unless RegisterValue.look_like_reg(left)
diff --git a/test/rubyx/builtin/test_integer_comparison.rb b/test/rubyx/builtin/test_integer_comparison.rb
new file mode 100644
index 00000000..649d4b61
--- /dev/null
+++ b/test/rubyx/builtin/test_integer_comparison.rb
@@ -0,0 +1,47 @@
+require_relative "helper"
+
+module RubyX
+  module Builtin
+    class TestIntegerSame < MiniTest::Test
+      include BuiltinHelper
+      def op ; :== ; end
+      def len ; 25 ; end
+      def source
+        <<GET
+        class Integer
+          def #{op}(other)
+            X.comparison(:"#{op}")
+          end
+        end
+GET
+      end
+      def test_mom_meth
+        assert_equal op , compiler.callable.name
+      end
+      def test_instr_len
+        assert_equal 7 , compiler.mom_instructions.length
+      end
+      def test_instr_op
+        assert_equal Mom::Comparison , compiler.mom_instructions.next.class
+        assert_equal op , compiler.mom_instructions.next.operator
+      end
+      def test_risc
+        assert_equal len , compiler.to_risc.risc_instructions.length
+      end
+    end
+    class TestIntegerLg < TestIntegerSame
+      def op ; :> ; end
+      def len ; 26 ; end
+    end
+    class TestIntegerSm < TestIntegerSame
+      def op ; :< ; end
+      def len ; 26 ; end
+    end
+    class TestIntegerLe < TestIntegerSame
+      def op ; :>= ; end
+    end
+    class TestIntegerSe < TestIntegerSame
+      def op ; :<= ; end
+    end
+  end
+end
diff --git a/test/rubyx/builtin/test_integer_div10.rb b/test/rubyx/builtin/test_integer_div10.rb
new file mode 100644
index 00000000..2f48e07e
--- /dev/null
+++ b/test/rubyx/builtin/test_integer_div10.rb
@@ -0,0 +1,30 @@
+require_relative "helper"
+
+module RubyX
+  module Builtin
+    class TestIntegerDiv10 < MiniTest::Test
+      include BuiltinHelper
+      def source
+        <<GET
+        class Integer
+          def div10
+            X.div10
+          end
+        end
+GET
+      end
+      def test_mom_meth
+        assert_equal :div10 , compiler.callable.name
+      end
+      def test_instr_len
+        assert_equal 7 , compiler.mom_instructions.length
+      end
+      def test_instr_get
+        assert_equal Mom::Div10 , compiler.mom_instructions.next.class
+      end
+      def test_risc
+        assert_equal 70 , compiler.to_risc.risc_instructions.length
+      end
+    end
+  end
+end
diff --git a/test/rubyx/builtin/test_integer_div4.rb b/test/rubyx/builtin/test_integer_div4.rb
new file mode 100644
index 00000000..e70199e6
--- /dev/null
+++ b/test/rubyx/builtin/test_integer_div4.rb
@@ -0,0 +1,30 @@
+require_relative "helper"
+
+module RubyX
+  module Builtin
+    class TestIntegerDiv4 < MiniTest::Test
+      include BuiltinHelper
+      def source
+        <<GET
+        class Integer
+          def div4
+            X.div4
+          end
+        end
+GET
+      end
+      def test_mom_meth
+        assert_equal :div4 , compiler.callable.name
+      end
+      def test_instr_len
+        assert_equal 7 , compiler.mom_instructions.length
+      end
+      def test_instr_get
+        assert_equal Mom::Div4 , compiler.mom_instructions.next.class
+      end
+      def test_risc
+        assert_equal 41 , compiler.to_risc.risc_instructions.length
+      end
+    end
+  end
+end
diff --git a/test/rubyx/builtin/test_integer_operator.rb b/test/rubyx/builtin/test_integer_operator.rb
new file mode 100644
index 00000000..f64d64e1
--- /dev/null
+++ b/test/rubyx/builtin/test_integer_operator.rb
@@ -0,0 +1,50 @@
+require_relative "helper"
+
+module RubyX
+  module Builtin
+    class TestIntegerPlus < MiniTest::Test
+      include BuiltinHelper
+      def op ; :+ ; end
+      def source
+        <<GET
+        class Integer
+          def #{op}(other)
+            X.int_operator(:"#{op}")
+          end
+        end
+GET
+      end
+      def test_mom_meth
+        assert_equal op , compiler.callable.name
+      end
+      def test_instr_len
+        assert_equal 7 , compiler.mom_instructions.length
+      end
+      def test_instr_op
+        assert_equal Mom::IntOperator , compiler.mom_instructions.next.class
+        assert_equal op , compiler.mom_instructions.next.operator
+      end
+      def test_risc
+        assert_equal 42 , compiler.to_risc.risc_instructions.length
+      end
+    end
+    class TestIntegerMinus < TestIntegerPlus
+      def op ; :- ; end
+    end
+    class TestIntegerRS < TestIntegerPlus
+      def op ; :<< ; end
+    end
+    class TestIntegerRS < TestIntegerPlus
+      def op ; :>> ; end
+    end
+    class TestIntegerMul < TestIntegerPlus
+      def op ; :* ; end
+    end
+    class TestIntegerAnd < TestIntegerPlus
+      def op ; :& ; end
+    end
+    class TestIntegerOr < TestIntegerPlus
+      def op ; :| ; end
+    end
+  end
+end