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Re: About Hazard Recognizer:DFA

From: Maxim Kuvyrkov <maxim at codesourcery dot com>
To: daniel tian <daniel dot xntian at gmail dot com>
Cc: uday at cse dot iitb dot ac dot in, gcc at gcc dot gnu dot org
Date: Wed, 07 Jan 2009 07:40:26 -0800
Subject: Re: About Hazard Recognizer:DFA
References: <121fadb80901041732i78e91f82w7d84d8410b9c02bc@mail.gmail.com>

daniel tian wrote:

Hi Dr. Uday Khedker:
   Happy New Year!
   I met hazard problem. And I have debuged  this error for  a few
days. I wrote DFA to avoid load hazard, but still it exists. I wonder
whether in default the command './cc1 hazard.c' doesn't compile the
file with DFA.

By default the scheduler is enabled starting at -O2, so this should at least be './cc1 -O2 hazard.c'. Of cause, you should also add generation of nops, as Vladimir said, either in machine dependent reorg or in assembler. Also, scheduler dumps may be helpful for you; they can be enabled via -fsched-verbose=N switch.

--
Maxim

References:
- About Hazard Recognizer:DFA
  - From: daniel tian

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