LOG_LINKS in the gcc

[Marcio de Oliveira Buss <ra990898 at ic dot unicamp dot br>]

	Folks,

	I am trying to implement some sort of use-def chains in
 the gcc. Thus, I am looking for the data-dependencies between
 the instructions.
	I have found the LOG_LINKS, which tell me, for each reg
 being used in an instruction, where is the most recent instruction
 that defines that register WITHIN the same basic block (am I right?? )

	But, and about the case when a definition of a "reg 1" is in 
 the basic block 3, for instance, and its next use is in the block 5?
 The LOG_LINK of that instruction in the block 5 will not be pointed
 to its definition in the block 3, will be??

 Could someone help me by tell me how can I build the data-dependencies
 relationships?


	Thanks a lot.

	Marcio Buss.