some helper functions

for when i started the assembler div10
in the end i did the div10 in some, so no need

lib/register/instructions/load_constant.rb

@@ -16,6 +16,9 @@ module Register
       "LoadConstant: #{register} <- #{constant_str}"
     end
 
+    def self.load source , constant , register
+      LoadConstant.new source , constant , register
+    end
     private
     def constant_str
         case @constant

lib/register/instructions/operator_instruction.rb

@@ -13,6 +13,9 @@ module Register
       "OperatorInstruction: #{left} #{operator} #{right}"
     end
 
+    def self.op source , operator , left , right
+      OperatorInstruction.new source , operator , left , right
+    end
   end
 
 end

lib/register/instructions/register_transfer.rb

@@ -29,5 +29,8 @@ module Register
       "RegisterTransfer: #{from} -> #{to}"
     end
 
+    def self.transfer source , from , to
+      RegisterTransfer.new source , from , to
+    end
   end
 end

lib/soml/compiler.rb

@@ -119,6 +119,12 @@ module Soml
       return reg
     end
 
+    def copy reg , source
+      copied = use_reg reg.type
+      add_code Reister.transfer source , reg , copied
+      copied
+    end
+
     # releasing a register (accuired by use_reg) makes it available for use again
     # thus avoiding possibly using too many registers
     def release_reg reg