[Bug tree-optimization/57233] Vector lowering of LROTATE_EXPR pessimizes code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57233

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-05-10
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The vector lowering pass should lower to (X << Y) | (X >> ((-Y) & 31))
instead if vector shifts are available.  Or just rely on the generic
RTL expansion support (via a new predicate, can_expand_vector_rotate_p or
similar).