record: compatibility check

migen/corelogic/record.py

@@ -19,7 +19,7 @@ class Record:
 
 	def template(self):
 		l = []
-		for key in self.__dict__:
+		for key in sorted(self.__dict__):
 			e = self.__dict__[key]
 			if isinstance(e, Signal):
 				l.append((key, e.bv))
@@ -59,6 +59,11 @@ class Record:
 			return l
 		return Record(dict_to_list(fields), "subrecord")
 	
+	def compatible(self, other):
+		tpl1 = self.template()
+		tpl2 = other.template()
+		return tpl1 == tpl2
+	
 	def flatten(self):
 		l = []
 		for key in sorted(self.__dict__):

migen/fhdl/structure.py

@@ -22,6 +22,9 @@ class BV:
 			r += "s"
 		r += "d"
 		return r
+	
+	def __eq__(self, other):
+		return self.width == other.width and self.signed == other.signed
 
 class Value:
 	def __invert__(self):