[MPlayer-users] Strange option. -O4

[Jens Axboe]

On Wed, Dec 25 2002, Arpi wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
> 
> 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.

Jens