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Re: 40% performance regression SPEC2006/leslie3d on gcc-4_2-branch
- From: David Edelsohn <dje at watson dot ibm dot com>
- To: "Vladimir Sysoev" <vladimir dot sysoev at gmail dot com>
- Cc: dberling at dberling dot org, gcc at gcc dot gnu dot org
- Date: Sat, 17 Feb 2007 08:21:36 -0500
- Subject: Re: 40% performance regression SPEC2006/leslie3d on gcc-4_2-branch
- References: <275bfc6c0702170235k3caee9b8l1ad486dba86bfe76@mail.gmail.com>
>>>>> Vladimir Sysoev writes:
Vladimir> It looks like your changeset listed bellow makes performance
Vladimir> regression ~40% on SPEC2006/leslie3d. I will try to create minimal
Vladimir> test for this issue this week and update you in any case.
I believe that this is known and expected. GCC 4.2 includes some
conservative alias analysis fixes for correctness that hurt performance.
David