[Bug tree-optimization/115494] [14/15 Regression] wrong code at -O{2,3} on x86_64-linux-gnu

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115494

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu.org
           Keywords|needs-bisection             |

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Hmm. disabling:

/* x | C -> C if we know that x & ~C == 0.  */
(simplify
 (bit_ior SSA_NAME@0 INTEGER_CST@1)
 (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
      && wi::bit_and_not (get_nonzero_bits (@0), wi::to_wide (@1)) == 0)
  @1))

Fixes it.

So this was caused/exposed by r14-3485-g6df8dcec7196e4 .

Note that above pattern is hitting during PRE. I have to double check to make
sure that is correct.