[Bug tree-optimization/104444] Missing constant folding in shift expression.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104444

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-02-08

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed:
int g(unsigned n) {
  return ((0xffffff) >> n) != 0;
}

So the general case is:
(simplify
 (neeq (lshift INTEGER_CST@0 @1) zero_p)
 (ltge (@1 {bitsizeoftype(@1) - wi::clz(@0);}))