Hi, Thank you for the clarification. I never expected such a quick response. On Tue, Nov 10, 2020 at 4:14 PM Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On Tue, 10 Nov 2020 at 04:14, Ezhil P via Gcc-help <gcc-help@xxxxxxxxxxx> > 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. > -- P.Ezhil, Asst Prof, L.N GOVERNMENT COLLEGE, PONNERI - 601204
