remove dead code

lib/arm/instructions/compare_instruction.rb

@@ -88,14 +88,6 @@ module Arm
       io.write_uint32 val
     end
 
-    def uses
-      ret = [@left.register ]
-      ret << @right.register unless @right.is_a? Constant
-      ret
-    end
-    def assigns
-      []
-    end
     def to_s
       "#{opcode} #{@left} , #{@right} #{super}"
     end

lib/arm/instructions/logic_instruction.rb

@@ -108,14 +108,5 @@ module Arm
     def to_s
       "#{self.class.name} #{opcode} #{@result} = #{@left} #{@right}  extra=#{@extra}"
     end
-    def uses
-      ret = []
-      ret << @left.register if @left and not @left.is_a? Constant
-      ret << @right.register if @right and not @right.is_a?(Constant)
-      ret
-    end
-    def assigns
-      [@result.register]
-    end
   end
 end

lib/arm/instructions/memory_instruction.rb

@@ -109,13 +109,5 @@ module Arm
       io.write_uint32 val
     end
 
-    def uses
-      ret = [@left.register ]
-      ret << @right.register unless @right.nil?
-      ret
-    end
-    def assigns
-      [@result.register]
-    end
   end
 end

lib/arm/instructions/move_instruction.rb

@@ -102,11 +102,5 @@ module Arm
       end
     end
 
-    def uses
-      @from.is_a?(Constant) ? [] : [@from.register]
-    end
-    def assigns
-      [@to.register]
-    end
   end
 end

lib/arm/instructions/stack_instruction.rb

@@ -59,18 +59,6 @@ module Arm
       io.write_uint32 val
     end
 
-    def is_push?
-      opcode == :push
-    end
-    def is_pop?
-      !is_push?
-    end
-    def uses
-      is_push? ? regs : []
-    end
-    def assigns
-      is_pop? ? regs : []
-    end
     def regs
       @first
     end