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Re: performance comparison post
- From: Jan Hubicka <hubicka at ucw dot cz>
- To: Xinliang David Li <davidxl at google dot com>, mjambor at suse dot cz
- Cc: gcc at gcc dot gnu dot org
- Date: Tue, 14 Dec 2010 11:21:17 +0100
- Subject: Re: performance comparison post
- References: <AANLkTi=1AYHNSSt4JMQ5mudzv6sM9aZ4npxBp7OT1Jmy@mail.gmail.com>
> Any comment on the following?
>
> http://blog.regehr.org/archives/320
>
> 1) is due to lack of non-linear induction variable support
> 5) is the same problem mentioned in pr35363
>
> I have not looked at the details of others -- there are probably
> related missed-optimization bugs already filed.
7) is probably best handled by extending switch conversion pass to discover switches
written as sequences of ifs and then convert two way switches into bitmask operation.
This was requested by kernel folks for a while.
Honza
>
> Thanks,
>
> David