[Bug c/59100] requesting optimization of safe rotate function

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59100

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, see PR45216 and PR57157.  Recognizing n?rotate<x,n>:x as rotate<x,n> can
be done, but probably not in forwprop or at least not at the same spot as
simplify_rotate, because it involves PHIs and different basic blocks.
Anyway, if you are going to recommend some idiom, I think the one in PR57157 is
better because if it doesn't get optimized into the rotate, it at least doesn't
contain any conditionals.