https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53987
--- Comment #13 from Oleg Endo <olegendo at gcc dot gnu.org> ---
attachment 36309 of PR 67506 is another example. It contains the following
code sequence:
mov.b @r2,r0 <<
extu.b r0,r0 <<
tst #128,r0
bt/s .L11
extu.w r0,r2 <<
mov r1,r2