On Tue, 2006-01-24 at 01:54 +1030, n0dalus wrote:
On 1/24/06, Josh Boyer <jwboyer(a)jdub.homelinux.org> wrote:
> > On Mon, 2006-01-23 at 07:53 -0600, Josh Boyer wrote:
> >
> > The "s" in -Os stands for "size", not for
"speed". So if -Os compiled
> > code-execution is faster than the default CFLAGS, something must be
> > broken elsewhere.
>
> That's not true. Yes, -Os stands for size. However code size _can_
> translate to performance increase. Think about cache footprint, etc.
> Smaller code means more can fit in the cache. It also results in a
> smaller DRAM footprint for thinks like shared libraries, etc.
>
Yes. In fact, -Os has been shown in many benchmarks to be just as good
if not occasionally superior in efficiency to -O2.
References? Which CPUs? How
generalizable are these results?
The fact that some applications might be running faster -Os-compiled,
doesn't mean much.
Ralf