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

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

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

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> Mine, the patch which fixes PR 103216 fixes this too.

Note it does not fix it fullly on the gimple level, we are left with:
  _1 = x_3(D) & 1;
  _7 = _1 != 0;
  _6 = (int) _7;
  _9 = x_3(D) - _6;


But the RTL level does optimize it to:
        movl    %edi, %eax
        andl    $-2, %eax