On Thu, May 29, 2014 at 12:21:06PM -0700, Russ Allbery wrote: > Xavier Roche <xav...@debian.org> writes: > > > I have a rather silly question: most (all ?) packages are built by > > default with -02 - something which is inherited from autotool's '-g -O2' > > default flagsd, I presume. > > > Is -O3 considered too dangerous ? (AFAICS, potential issues are mainly > > present in O2) Or is it considered worthless because the performance > > gain would be really low ? > > Historically, -O3 has usually been slower than -O2 for a lot of software > because the aggressive loop unrolling increases code size and interferes > with processor caching strategies. I don't know if that's now been fixed > in GCC, but that's probably much of the historical reason.
That's still true. Mike -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140529223624.gb8...@glandium.org
