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Re: Haney's real matrix test regression
- To: Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>, gcc at gcc dot gnu dot org
- Subject: Re: Haney's real matrix test regression
- From: Paolo Carlini <pcarlini at unitus dot it>
- Date: Sat, 27 Oct 2001 17:14:09 +0200
- References: <10110271503.AA23640@vlsi1.ultra.nyu.edu>
Richard Kenner wrote:
> This is because G++ uses alias set zero for all aggregate types, thus
> disabling most alias analysis.
> I have no idea what's involved in improving that or whether it will be
> done in time for GCC 3.1
I'm very confused.
For sure the "O-O C++" version performed better than the "hard coded C"
version of the test case until a week ago, and this is the case indeed
the case for gcc3.0.2.
You mean that your recent checkins, while improving the optimization of C
code have a negative impact for C++ code until some radical modifications
are implemented to improve C++ alias analysis?