[Bug tree-optimization/97711] Failure to optimise "x & 1 ? x - 1 : x" to "x & -2"

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97711

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2020-11-04

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  Guess another value-replacement for phiopt and/or a match.pd
pattern
(and maybe make phiopt do a match simplify query with a "fake" COND_EXPR in
pieces to avoid duplicating things)