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[Bug rtl-optimization/23524] bigger version of mov + cmp produced
- From: "pinskia at physics dot uc dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Aug 2005 18:07:58 -0000
- Subject: [Bug rtl-optimization/23524] bigger version of mov + cmp produced
- References: <20050823055345.23524.dann@godzilla.ics.uci.edu>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at physics dot uc dot edu 2005-08-23 18:07 -------
Subject: Re: bigger version of mov + cmp produced
On Aug 23, 2005, at 2:06 PM, dann at godzilla dot ics dot uci dot edu
wrote:
>
> ------- Additional Comments From dann at godzilla dot ics dot uci dot
> edu 2005-08-23 18:05 -------
> (In reply to comment #2)
>> You really should know that we only care about code size at -Os. We
>> care
> about performance
>> regressions though at -O2.
>
> Code size is important for performance for modern processors. Small
> I-cache (and
> I-TLB) footprint for otherwise equivalent code results in better
> performance.
Then use -Os every where instead. You will see that the overall code
size for 4.1
has reduced from 4.0.
-- Pinski
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23524