[Bug target/91838] [8/9 Regression] incorrect use of shr and shrx to shift by 64, missed optimization of vector shift

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91838

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-01-23
                 CC|                            |marxin at gcc dot gnu.org,
                   |                            |tnfchris at gcc dot gnu.org,
                   |                            |uros at gcc dot gnu.org
      Known to work|                            |10.0, 7.4.0
            Summary|incorrect use of shr and    |[8/9 Regression] incorrect
                   |shrx to shift by 64, missed |use of shr and shrx to
                   |optimization of vector      |shift by 64, missed
                   |shift                       |optimization of vector
                   |                            |shift
     Ever confirmed|0                           |1
      Known to fail|                            |8.3.0, 9.2.0

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
So the issue started with r8-349-gcc5b8f3d568e95ce74e03d8d87ada71117a6c106 and
disappeared in r10-2445-g5fbc8ab48a57a75e0ce064befc30dee3dc63327a.