[Bug middle-end/82479] missing popcount builtin detection

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82479

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |8.0

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Technically loop distribution would be one place to add this.  Or SCEV cprop.

The pattern matching should be quite cheap - the question is of course how many
different ways to express popcount exist...  so it does somewhat feel like a
SPEC hack...