[Bug rtl-optimization/66706] Redundant bitmask instruction on x >> (n & 32)

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66706

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-06-30
           Assignee|unassigned at gcc dot gnu.org      |segher at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
For some reason when combining the zero_extend with the lshiftrt,
combine writes it as the equivalent and-of-subreg.  Which doesn't
match any existing backend pattern.

Confirmed; mine.