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Re: Haney's real matrix test regression
- To: pcarlini at unitus dot it
- Subject: Re: Haney's real matrix test regression
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Date: Sat, 27 Oct 01 11:24:24 EDT
- Cc: gcc at gcc dot gnu dot org
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.
Well, I'd say try again, since what we're seeing is C++-specific.
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?
My changes were not to improve optimization, but to fix bugs where the
wrong alias set was used. I don't have any idea if a "radical modication"
of G++ is needed to allow using normal alias sets or not since I have
no idea why they have been disabled. Hopefully, that's just a very
overly-conservative test that can be refined. For example, as written,
it applies to all ARRAY_TYPEs, but the comment suggest it shouldn't.