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Re: Compilation performance comparison of gcc3.4.1 and gcc3.5.02004-08-30 on MICO sources
- From: Karel Gardas <kgardas at objectsecurity dot com>
- To: Giovanni Bajo <giovannibajo at libero dot it>
- Cc: gcc at gcc dot gnu dot org
- Date: Thu, 2 Sep 2004 11:44:17 +0200 (CEST)
- Subject: Re: Compilation performance comparison of gcc3.4.1 and gcc3.5.02004-08-30 on MICO sources
On Wed, 1 Sep 2004, Giovanni Bajo wrote:
> Actually, I should also note that at this point we cannot probably do much
> about compile time regressions at -O1/2/3. GCC 3.5 features more than 60 new
> optimization passes, so it is already a half miracle we don't regress
Yes, I'm also surprised that 3.5 looks so good even so much stuff was
> Code generation is also improved of course, so we have to lose a
> little somwhere. Of course, big regressions (>20% on files of non-trivial size)
> could probably still analyzed a little to see if we find obvious offenders.
> Thank you for doing this, it is of great help!
You are welcome! Now, in the light of observation described in my last
email I'm thinking how to mix 3.5.0 with 3.4.1's libstdc++ together to get
the best of both in one experimental compiler. :-)
Karel Gardas firstname.lastname@example.org
ObjectSecurity Ltd. http://www.objectsecurity.com