https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103439

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to rguent...@suse.de from comment #2)
> On Fri, 26 Nov 2021, ubizjak at gmail dot com wrote:
> 
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103439
> > 
> > --- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
> > (In reply to Richard Biener from comment #0)
> > > I'm not sure if there are valid cases where we have a mix of a direct
> > > RTL pattern and manual expansion, so where the { } part falls thru.
> > 
> > Yes, we have quite some of them in e.g. i386.md, movstrict<mode>, 
> > extv<mode>,
> > extzv<mode>, insv<mode> and zero_extend expanders are some of them.
> 
> OK, so that's conditional FAILs.  I've not yet found a conditional
> DONE that eventually falls through to a "DONE via the pattern".

Look at zero_extend and extend expanders.

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