move a function out of the builder to tools for clarity

lib/asm/instruction_tools.rb

@@ -55,4 +55,27 @@ module Asm
         ref
       end
     end
+    
+    def calculate_u8_with_rr(arg)
+      parts = arg.value.to_s(2).rjust(32,'0').scan(/^(0*)(.+?)0*$/).flatten
+      pre_zeros = parts[0].length
+      imm_len = parts[1].length
+      if ((pre_zeros+imm_len) % 2 == 1)
+        u8_imm = (parts[1]+'0').to_i(2)
+        imm_len += 1
+      else
+        u8_imm = parts[1].to_i(2)
+      end
+      if (u8_imm.fits_u8?)
+        # can do!
+        rot_imm = (pre_zeros+imm_len) / 2
+        if (rot_imm > 15)
+          return nil
+        end
+        return u8_imm | (rot_imm << 8)
+      else
+        return nil
+      end
+    end
+    
 end

lib/asm/normal_builder.rb

@@ -19,28 +19,6 @@ module Asm
       attr_accessor :cond, :inst_class, :i, :opcode, :s,
                     :rn, :rd, :operand
 
-      def calculate_u8_with_rr(arg)
-        parts = arg.value.to_s(2).rjust(32,'0').scan(/^(0*)(.+?)0*$/).flatten
-        pre_zeros = parts[0].length
-        imm_len = parts[1].length
-        if ((pre_zeros+imm_len) % 2 == 1)
-          u8_imm = (parts[1]+'0').to_i(2)
-          imm_len += 1
-        else
-          u8_imm = parts[1].to_i(2)
-        end
-        if (u8_imm.fits_u8?)
-          # can do!
-          rot_imm = (pre_zeros+imm_len) / 2
-          if (rot_imm > 15)
-            return nil
-          end
-          return u8_imm | (rot_imm << 8)
-        else
-          return nil
-        end
-      end
-
       # Build representation for source value
       def build_operand(arg , position = 0) 
         #position only needed for calculating relative addresses to data objects