https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #13 from Andrew Pinski ---
Seems to be most of this should not implemented this way but rather an IPA RA
pass (which GCC already does but not always and definitely not across IPA
boundaries).
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
Sam James changed:
What|Removed |Added
CC||arsen at gcc dot gnu.org,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #11 from Michael Matz ---
(In reply to Florian Weimer from comment #10)
> (In reply to Michael Matz from comment #9)
> > > > I don't see how that helps. Imagine a preserve_all function foo that
> > > > calls
> > > > printf. How
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #10 from Florian Weimer ---
(In reply to Michael Matz from comment #9)
> > > I don't see how that helps. Imagine a preserve_all function foo that
> > > calls
> > > printf. How do you propose that 'foo' saves all parts of the SSE
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #9 from Michael Matz ---
(In reply to Florian Weimer from comment #8)
> (In reply to Michael Matz from comment #7)
> > > > Does the clang implementation take into account the various problematic
> > > > cases that arise when calling
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #8 from Florian Weimer ---
(In reply to Michael Matz from comment #7)
> > > Does the clang implementation take into account the various problematic
> > > cases that arise when calling a normal function from a (say) preserve_all
> >
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #7 from Michael Matz ---
(In reply to Florian Weimer from comment #5)
> > It also makes argument registers be callee-saved, which is very
> > unconventional.
>
> Isn't this done for the this pointer in some C++ ABIs?
There are
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
Jan Hubicka changed:
What|Removed |Added
CC||hubicka at gcc dot gnu.org
--- Comment
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #5 from Florian Weimer ---
(In reply to Michael Matz from comment #3)
> For ABIs you generally want a good mix between caller- and callee-saved
> registers. The x86-64 psABI didn't do that on the SSE regs for conscious, but
>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #4 from Michael Matz ---
(In reply to Florian Weimer from comment #2)
> I tried to write up something for the x86-64 psABI:
>
> Document the ABI for __preserve_most__ function calls
>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
--- Comment #3 from Michael Matz ---
Huh, since when does clang implement this? See also
https://gcc.gnu.org/pipermail/gcc-patches/2023-July/624004.html
where I asked for comments about a similar, but not same, mechanism. I came
from
the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
Florian Weimer changed:
What|Removed |Added
CC||fw at gcc dot gnu.org
--- Comment #2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
Richard Biener changed:
What|Removed |Added
Target||x86_64-*-* aarch64-*-*
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110899
Andrew Pinski changed:
What|Removed |Added
Severity|normal |enhancement
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