finding dfa scheduler patch

[Naveen Sharma, Noida]

> I want to use the dfa schduler to schedule
> instructions. I will be grateful if anyone can guide
> me how to obtain the dfa scheduler patch Iam not
> really sure how to get it. 

The patch is already is in the mainline sources.You can check the mainline
sources to see if a DFA description is written for your target or see
http://gcc.gnu.org/news/dfa.html if your target is listed there. 
The gcc online internal manual describes how to use the DFA 
scheduler ( in case you need to start writing a DFA description ).
  
Regards,
  Naveen Sharma.