Doubt related to O3 optimization

[Jonathan Wakely]

On Tue, 10 Nov 2020 at 04:14, Ezhil P via Gcc-help <gcc-help@gcc.gnu.org> wrote:
>
> hi,
> Have a great day
> In GCC does optimization levels O2 and O3 use profile information by
> default without specifying -fprofile options explicitly?

No.

> Because O3 uses
> flags like -fipa-cp-clone which actually require profile information.

I don't think it requires it. It works better with profile info, but
doesn't require it.

> If so , where are the data files related to profile information stored for
> reference?

They're not, because profile info is not used unless enabled explicitly.