fold last of the virtual into register

lib/register/padding.rb

@@ -0,0 +1,21 @@
+
+module Padding
+
+  # objects only come in lengths of multiple of 8 words
+  # but there is a constant overhead of 2 words, one for type, one for layout
+  # and as we would have to subtract 1 to make it work without overhead, we now have to add 7
+  def padded len
+    a = 32 * (1 + (len + 7)/32 )
+    #puts "#{a} for #{len}"
+    a
+  end
+
+  def padded_words words
+    padded(words*4) # 4 == word length, a constant waiting for a home
+  end
+
+  def padding_for length
+    pad = padded(length) - length - 8 # for header, type and layout
+    pad
+  end
+end