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Re: Disabling CSE passes and GC?

From: Jan Hubicka <jh at suse dot cz>
To: Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>
Cc: gcc at gcc dot gnu dot org
Date: Tue, 10 Dec 2002 16:41:08 +0100
Subject: Re: Disabling CSE passes and GC?
References: <Pine.LNX.4.33.0212101223480.10722-100000@bellatrix.tat.physik.uni-tuebingen.de>

> Hi!
> 
> To speed up compilation I'd like to disable CSE, CSE 2 and garbage
> collecting (i.e. just dont free mem at all). I cannot find options to do
> so, though (looked at gcc 3.0 and gcc 3.2).
CSE is disabled at -O0.  It does not make much sense to have optimizing
compilation without CSE, but you can get it faster with
-fnocse-follow-jumps and -fno-cse-skip-blocks.
CSE2 pass can be disabled with -fnorerun-cse-after-loop
There is no way currently to control GC I believe.
Adding function to control it's behaviour may make sense.

Honza
> 
> Can we add such options?
> 
> Thanks, Richard.
> 
> --
> Richard Guenther <richard.guenther@uni-tuebingen.de>
> WWW: http://www.tat.physik.uni-tuebingen.de/~rguenth/

References:
- Disabling CSE passes and GC?
  - From: Richard Guenther

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