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DFA-scheduler
- From: "P. Pavan Kumar" <pavankumar at cse dot iitb dot ac dot in>
- To: vmakarov at redhat dot com
- Cc: gcc-help at gcc dot gnu dot org
- Date: Sat, 3 Mar 2007 23:59:22 +0530 (IST)
- Subject: DFA-scheduler
- Reply-to: pavankumar at cse dot iitb dot ac dot in
Respected sir,
DFA pipeline hazard recognizer is used to avoid structural hazards.
While intra block(basic block scheduling) scheduling how data hazards are
avoided . DFA will take care of only structural hazards, but what about
data hazards.
First cycle mutiple pass scheduling algorithm tries different schedules
and choose the best one.
intra block scheduling reorders the instructions within the basic block by
constructing DAG and based on LIST scheduling algorithm .
If First cycle mutiple pass algorithm chooses the best schedule then why
gcc needs intra block scheduling ?
Now gcc will do instruction scheduling beyond basic blocks i,e inter block
scheduling (region scheduling) then why gcc needs intrablock scheduling?
what is command line option for enabling only intra block(with in basic
block) scheduling. and diabling all remaining intruction scheduling (
trace, modulo etc).
Please help me sir.
Thanks in advance
Pavan,
Home: http://www.cse.iitb.ac.in/~pavankumar