https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90323
--- Comment #15 from luoxhu at gcc dot gnu.org ---
(In reply to Segher Boessenkool from comment #14)
> (In reply to luoxhu from comment #12)
> > That code was called by combine pass but fail to match.
>
> >
> > pr newpat
> > (set (reg:DI 125 [ l ])
> > (xor:DI (and:DI (xor:DI (reg/v:DI 120 [ l ])
> > (reg:DI 127))
> > (const_int 267390975 [0xff00fff]))
> > (reg/v:DI 120 [ l ])))
>
> Note this is 0x0ff00fff, and this is not a valid mask for rlwimi.
OK, it also fails to combine for 0x01000000.
.cfi_startproc
xor 4,3,4
rlwinm 4,4,0,7,7
xor 3,4,3
blr
