https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104444
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note we generally avoid "folding" undefined to anything specific, but what
could
trigger here is path isolation seeing
if (n >= 0 && n < 32)
;
else
if (m >> n != 0)
...
making the else path unreachable (or trap for the sake of QOI).
