Use-def chains

[Marcio de Oliveira Buss]

 	Could someone help me?
 
 	How can I determine (or where are) the use-definition chains
  in the sources of the gcc?  

	Or, more generally: How can I know if one statement in the
  RTL linked list is dependent one another via data dependence??
 
 	Thanks very much.
 
 	M. Buss.