[Bug target/29776] result of ffs/clz/ctz/popcount/parity are already sign-extended

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29776

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-12-24
     Ever Confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-12-24 06:46:16 UTC ---
Trying 9 -> 10:
Failed to match this instruction:
(set (reg:DI 69 [ D.1710 ])
    (sign_extend:DI (ctz:SI (reg:SI 67 [ x ]))))

Should be changed to zero_extend and then that could be matched really.