[Bug middle-end/90693] Missing popcount simplifications

[david.bolvansky at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90693

Dávid Bolvanský <david.bolvansky at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |david.bolvansky at gmail dot com

--- Comment #1 from Dávid Bolvanský <david.bolvansky at gmail dot com> ---
>> __builtin_popcount (x) == 1 into x == (x & -x)


This will not work for x = 0.

Should work:
x && x == (x & -x)
x && (x & x-1) == 0