This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Should -fcross-jumping be part of -O1?
- From: <tm_gccmail at kloo dot net>
- To: Scott Robert Ladd <coyote at coyotegulch dot com>
- Cc: Jamie Lokier <jamie at shareable dot org>,gcc mailing list <gcc at gcc dot gnu dot org>
- Date: Mon, 24 Nov 2003 12:13:30 -0800 (PST)
- Subject: Re: Should -fcross-jumping be part of -O1?
On Sun, 23 Nov 2003, Scott Robert Ladd wrote:
> Jamie Lokier wrote:
> > Notably, some people say that kernels optimised for size (-Os) run
> > _faster_ than kernels optimised for "speed" (-O2).
>
> In my experience, -Os is generally faster than -O1, although not as fast
> as -O2. I have seen cases where -O2 is substantially *slower* than -O0
> (no optimization.)
Can you send me a testcase so I can examine it?
Toshi