[Bug tree-optimization/81165] Regression in GCC-8.0.0's optimizer

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81165

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-06-22
                 CC|                            |marxin at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org
      Known to work|                            |7.1.0
     Ever confirmed|0                           |1
      Known to fail|                            |6.3.0, 8.0

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, there are times for releases:

  4.9.0 
Run-time: 1.040000
  4.9.1 
Run-time: 1.030000
  4.9.2 
Run-time: 1.020000
  4.9.3 
Run-time: 1.020000
  4.9.4 
Run-time: 1.030000
  5.1.0 
Run-time: 1.030000
  5.2.0 
Run-time: 1.030000
  5.3.0 
Run-time: 1.040000
  5.4.0 
Run-time: 1.030000
  6.1.0 
Run-time: 1.030000
  6.2.0 
Run-time: 1.030000
  6.3.0 
Run-time: 1.030000
  7.1.0 
Run-time: 0.180000

Regressed again in GCC 8 by Richi's r247049 and is fast in GCC 7 because of
r242872.