[Bug target/107304] internal compiler error: in convert_move, at expr.cc:220 with -march=tigerlake

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107304

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Hongtao.liu from comment #8)
> (In reply to H.J. Lu from comment #7)
> > (In reply to Hongtao.liu from comment #6)
> > > (In reply to Hongtao.liu from comment #5)
> > > > (In reply to H.J. Lu from comment #4)
> > > > > Since the default is -march=tigerlake, it enables AVX512 in the middle end.
> > > > > When "arch=alderlake" disables AVX512, we fails to expand AVX512 to
> > > > > non-AVX512
> > > > > ISAs. It means that target_clones can't be more restrictive than the
> > > > > default. We
> > > > > should provide better diagnostics.
> > > > 
> > > > Is there any place checking ISA difference for target_clones?
> > > 
> > > ix86_valid_target_attribute_inner_p?
> > 
> > It may not have all ISA infos.  Will this
> > 
> > diff --git a/gcc/config/i386/i386-options.cc
> > b/gcc/config/i386/i386-options.cc
> > index acb2291e70f..1efaae132e9 100644
> > --- a/gcc/config/i386/i386-options.cc
> > +++ b/gcc/config/i386/i386-options.cc
> > @@ -2953,6 +2953,14 @@ ix86_option_override_internal (bool main_args_p,
> >       fine grained control & costing.  */
> >    SET_OPTION_IF_UNSET (opts, opts_set, param_vect_partial_vector_usage, 0);
> >  
> > +  if (!main_args_p
> > +      && &global_options != opts
> > +      && (((opts->x_ix86_isa_flags & global_options.x_ix86_isa_flags)
> > +     != global_options.x_ix86_isa_flags)
> > +    || ((opts->x_ix86_isa_flags2 & global_options.x_ix86_isa_flags2)
> > +        != global_options.x_ix86_isa_flags2)))
> > +    error ("Target ISAs are more restrictive than the default");
> > +
> >    return true;
> >  }
> >  
> > work?
> 
> Looks reasonable to me.

It doesn't work since we may use target attribute to disable MMX/SSE/SSE2.
This problem seems to be __builtin_shuffle related.