On Thursday, October 31, 2024, Jakub Jelinek <ja...@redhat.com> wrote:

> On Wed, Oct 30, 2024 at 10:46:01PM -0400, Neal Gompa wrote:
> > I know the idea of moving to -O3 has been briefly mentioned before in
> > other contexts when we've discussed uplifting the flags, but it looks
> > like Ubuntu is moving to -O3 for Ubuntu 25.04[1]. Is there a reason
> > why we shouldn't consider doing the same for Fedora Linux 42?
>
> Yes, this is a very bad idea.
>
> -O3 significantly increases code size (and the speed up gains aren't really
> guaranteed), which is highly undesirable when the vast majority of code in
> the distro isn't performance critical, the I-cache footprint is then more
> important.


>
Isn't instruction cache footprint already part of "performance" i.e if
performance is improved it shouldn't matter and vice versa, or what am I
missing?
-- 
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