Messages in this thread | | | Date | Fri, 24 May 2002 18:44:02 +0100 | From | Christoph Hellwig <> | Subject | Re: Compiling 2.2.19 with -O3 flag |
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On Fri, May 24, 2002 at 09:54:04AM -0700, Robert Love wrote: > On Fri, 2002-05-24 at 09:45, Marcus Meissner wrote: > > > > Heh, now that is interesting. > > > > Not really, -Os implies -O2, cf gcc/toplev.c: > > Well, according to Alan -Os outperforms -O2. So either the code is > smaller _and_ faster - and that is surely interesting - or the code is > _not_ smaller and -Os is a misnomer. Seems interesting to me.
-Os implies -O2 + additional size-reducing features:
[hch@sb hch]$ grep -r optimize_size /work/people/hch/gcc/gcc | wc -l 250 [hch@sb hch]$
A bunch of matches are in ChangeLog and most are target-specific, but I guess you got the point..
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