[MPlayer-users] Strange option. -O4
axboe at suse.de
Wed Dec 25 13:57:02 CET 2002
On Wed, Dec 25 2002, Arpi wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> 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 which can kill icache
completely and is often a net loss.
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