https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120090
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- before:(and:SI (subreg:SI (unspec:QI [ (mem:V8HI (reg/f:SI 98 [ pi128.0_1 ]) [0 *pi128.0_1+0 S16 A128]) (reg:V8HI 110 [ _16 ]) (const_int 0 [0]) ] UNSPEC_UNSIGNED_PCMP) 0) (const_int 255 [0xff])) after:(and:DI (clobber:DI (const_int 0 [0])) (const_int 255 [0xff])) clobber means we can't do it ...