[Moving to gcc-patches] > -----Original Message----- > From: Gcc <gcc-boun...@gcc.gnu.org> On Behalf Of Andrew Pinski via Gcc > Sent: 30 April 2020 07:21 > To: Florian Weimer <fwei...@redhat.com> > Cc: GCC Mailing List <g...@gcc.gnu.org>; nmeye...@amzn.com > Subject: Re: Should ARMv8-A generic tuning default to -moutline-atomics > > On Wed, Apr 29, 2020 at 6:25 AM Florian Weimer via Gcc <g...@gcc.gnu.org> > wrote: > > > > Distributions are receiving requests to build things with > > -moutline-atomics: > > > > <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=956418> > > > > Should this be reflected in the GCC upstream defaults for ARMv8-A > > generic tuning? It does not make much sense to me if every distribution > > has to overide these flags, either in their build system or by patching > > GCC. > > At least we should make it a configure option. > I do want the ability to default it for our (Marvell) toolchain for > Linux (our bare metal toolchain will be defaulting to ARMv8.2-a > anyways).
After some internal discussions, I am open to having it on as a default. Here are two versions. One has it as a tuning setting that CPUs can override, the other just switches it on by default always unless overridden by -mno-outline-atomics. I slightly prefer the second one as it's cleaner and simpler, but happy to take either. Any preferences? Thanks, Kyrill ChangeLogs: 2020-04-30 Kyrylo Tkachov <kyrylo.tkac...@arm.com> * config/aarch64/aarch64-tuning-flags.def (no_outline_atomics): Declare. * config/aarch64/aarch64.h (TARGET_OUTLINE_ATOMICS): Define. * config/aarch64/aarch64.opt (moutline-atomics): Change to Int variable. 2020-04-30 Kyrylo Tkachov <kyrylo.tkac...@arm.com> * config/aarch64/aarch64.h (TARGET_OUTLINE_ATOMICS): Define. * config/aarch64/aarch64.opt (moutline-atomics): Change to Int variable. * doc/invoke.texi (moutline-atomics): Document as on by default.