On Thu, May 4, 2023 at 7:37 AM Hongtao Liu via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> On Thu, May 4, 2023 at 1:35 PM Hongtao Liu <crazy...@gmail.com> wrote:
> >
> > On Thu, Dec 22, 2022 at 4:04 PM Uros Bizjak <ubiz...@gmail.com> wrote:
> > >
> > > On Thu, Dec 22, 2022 at 5:40 AM Hongtao Liu <crazy...@gmail.com> wrote:
> > > >
> > > > On Thu, Dec 22, 2022 at 6:46 AM Jakub Jelinek <ja...@redhat.com> wrote:
> > > > >
> > > > > On Wed, Dec 21, 2022 at 02:43:43PM -0800, H.J. Lu wrote:
> > > > > > > > > > > > Target RejectNegative
> > > > > > > > > > > > Set 80387 floating-point precision to 80-bit.
> > > > > > > > > > > >
> > > > > > > > > > > > +mdaz-ftz
> > > > > > > > > > > > +Target
> > > > > > > > > > >
> > > > > > > > > > > s/Target/Driver/
> > > > > > > > > > Change to Driver and Got error like:cc1: error:
> > > > > > > > > > command-line option
> > > > > > > > > > ‘-mdaz-ftz’ is valid for the driver but not for C.
> > > > > > > > > Hi Jakub:
> > > > > > > > > I didn't find a good solution to handle this error after
> > > > > > > > > changing
> > > > > > > > > *Target* to *Driver*, Could you give some hints how to solve
> > > > > > > > > this
> > > > > > > > > problem?
> > > > > > > > > Or is it ok for you to mark this as *Target*(there won't be
> > > > > > > > > any save
> > > > > > > > > and restore in cfun since there's no variable defined here.)
> > > > > > > >
> > > > > > > > Since all -m* options are passed to cc1, -mdaz-ftz can't be
> > > > > > > > marked
> > > > > > > > as Driver. We need to give it a different name to mark it as
> > > > > > > > Driver.
> > > > > > >
> > > > > > > It is ok like that.
> > > > > > >
> > > > > > > Jakub
> > > > > > >
> > > > > >
> > > > > > The GCC driver handles -mno-XXX automatically for -mXXX. Use
> > > > > > a different name needs to handle the negation. Or we can do
> > > > > > something
> > > > > > like this to check for CL_DRIVER before passing it to cc1.
> > > > >
> > > > > I meant I'm ok with -m{,no-}daz-ftz option being Target rather than
> > > > > Driver.
> > > > >
> > > > Thanks.
> > > > Uros, Is the patch for you?
> > >
> > > The original patch is then OK.
> > Some users found the -mdaz-ftz option to be very useful, and want it
> > to be backport to GCC12 and GCC11.
> > But the patch is not a bugfix one, so i'd like to ask options from
> s/options/opinions/g
> > other maintainers, if the patch is suitable for backport?
> >
> > The backport patches include both this one and [1] which apply
> > -mdaz-ftz to all other x86 targets.
> >
> > [1] https://gcc.gnu.org/pipermail/gcc-patches/2023-January/610053.html
Please make sure to not backport the -ffast-math linker spec change though.
Also note the 12 branch is currently frozen.
I'll defer to x86 maintainers on the -mdaz-ftz flag itself.
Richard.
> > >
> > > Thanks,
> > > Uros.
> >
> >
> >
> > --
> > BR,
> > Hongtao
>
>
>
> --
> BR,
> Hongtao
