[MPlayer-users] Re: Strange option. -O4
Jens Axboe
axboe at suse.de
Wed Dec 25 20:40:03 CET 2002
On Wed, Dec 25 2002, Anssi Saari wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> On Wed, Dec 25, 2002 at 01:56:12PM +0100, Jens Axboe wrote:
>
> > > if -O3 enables all possible opts, then -O4 probably enables impossible ones
> > > too :)
> >
> > has any benchmarking been done whether that is truly a good idea or not?
> > levels above 2 does automatic loop unrolling
>
> Does it really? At least my understanding of the gcc manual isn't that.
> It seems to me one would always need to enable loop unrolling with
> -funroll-loops or -funroll-all-loops.
Sorry recollection, I meant -finline-functions. Same effect, though :)
Jens
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