* Steven Rostedt <rost...@goodmis.org> wrote:
> On Sat, 2013-01-26 at 11:43 -0800, Linus Torvalds wrote:
>
> > The problem, of course, is that most -O2 code generation is done
> > assuming hot loops that don't show much if any I$ issues. And the -Os
> > thing is done *purely* for size, not taking any performance into
> > account at all. There's no balanced middle ground, which is what _we_
> > would want.
>
> Gcc needs to implement a -Olinus
What we really want is a sane default for 'library code'
optimization:
- cache-cold optimizations for run-through-once non-looping
code (-Os)
- good loop optimizations for anything that arguably loops (-O2)
- plus common-sense fixes to -Os like not throwing away
explicit branch hints we go to great pains to insert.
Possibly some time this decade.
Thanks,
Ingo
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