https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106816
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Simon Rainer from comment #2)
> (In reply to H.J. Lu from comment #1)
> > Like this?
> >
> > diff --git a/gcc/config/i386/i386-features.cc
> > b/gcc/config/i386/i386-features.cc
> > index fd212262f50..4904e4d71b3 100644
> > --- a/gcc/config/i386/i386-features.cc
> > +++ b/gcc/config/i386/i386-features.cc
> > @@ -3269,6 +3269,9 @@ ix86_get_function_versions_dispatcher (void *decl)
> > /* Right now, the dispatching is done via ifunc. */
> > dispatch_decl = make_dispatcher_decl (default_node->decl);
> > TREE_NOTHROW (dispatch_decl) = TREE_NOTHROW (fn);
> > + TREE_THIS_VOLATILE (dispatch_decl) = TREE_THIS_VOLATILE (fn);
> > + TREE_READONLY (dispatch_decl) = TREE_READONLY (fn);
> > + DECL_PURE_P (dispatch_decl) = DECL_PURE_P (fn);
> >
> > dispatcher_node = cgraph_node::get_create (dispatch_decl);
> > gcc_assert (dispatcher_node != NULL);
>
> I tried something like that, but I didn't see changes in the generated
> assembly. I don't know if that is because something else is preventing
> optimization or some other member needs to be set correctly.
I got
main:
.LFB2:
.cfi_startproc
subq $8, %rsp
.cfi_def_cfa_offset 16
call _Z5_Z1fvv
.cfi_endproc
It looks correct.
