On Mon, Mar 23, 2020 at 4:34 PM Jakub Jelinek <ja...@redhat.com> wrote: > > On Mon, Mar 23, 2020 at 04:29:12PM +0100, Richard Biener wrote: > > I wonder if we can leverage the bswap pass for rotate detection > > (see find_bswap_or_nop which matches the symbolic number > > against either 1:1 or byte-swapped variants, to be added would be > > rotate and shift patterns). > > That pass can only handle cases where the shift counts are multiple of > BITS_PER_UNIT, the whole infrastructure is based on being able to track > movements of bytes.
That's true, but also an artifact of the symbolic number encoding. > Jakub >
