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Re: Performace decrease with -freduce-all-givs
- To: Kevin Camera <kcamera at eecs dot berkeley dot edu>
- Subject: Re: Performace decrease with -freduce-all-givs
- From: Andreas Jaeger <aj at suse dot de>
- Date: Mon, 10 Sep 2001 08:53:59 +0200
- Cc: <gcc at gcc dot gnu dot org>
- References: <Pine.LNX.4.33.0109092156390.11695-101000@carrera.local>
Kevin Camera <kcamera@eecs.berkeley.edu> writes:
> Hello,
>
> Here is some temporary source for a class project that exhibits worse
> performance (about 15% worse) with the -freduce-all-givs option set. The
> performance degrades even more if -fmove-all-movables is set, in case that
> helps you at all.
Which compiler and which compiler flags did you use? Which architecture?
> I'm not a compiler guy, so sorry if the source is all I can offer...
That's a C source, the discussion was related to Fortran source.
Andreas
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.inka.de
http://www.suse.de/~aj