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Re: C++: EGCS perf. vs GCC
- To: dyson at iquest dot net
- Subject: Re: C++: EGCS perf. vs GCC
- From: Jeffrey A Law <law at hurl dot cygnus dot com>
- Date: Mon, 07 Dec 1998 12:40:00 -0700
- cc: amaranda at spider dot com, egcs at cygnus dot com, egcs-bugs at cygnus dot com
- Reply-To: law at cygnus dot com
In message <199812071914.OAA06892@y.dyson.net>you write:
> It seems that scheduling with the P6 is sometimes counter intuitive.
Scheduling in general can be counter intuitive :-) I've spent most of the
last two weeks with my head buried in haifa pipeline dumps for a project I'm
working on.
> One can often gain significant performance improvements, but those
> improvements are very sensitive to alignment and "pipeline" state.
Yes. We've actually got most (all?) of the recommended stuff for PPro/PII
instruction alignments. It was a small, but noticable win. We've also made
significant improvments to data alignments, but more work needs to be done for
the data alignments, particularly stuff in the stack.
I suggest reviewing
> carefully:
>
> http://www.announce.com/agner/assem
Yup. Definitely worth the time for anyone that is interested in optimize
Pentium, PPro/PII.
jeff