[Bug target/109734] ARM64 support for __builtin_popcountll

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109734

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
FEAT_CSSC

You need to enable it with -march=armv8-a+cssc .

I don't know of an arm64 core that implements cssc yet. It was added part of
armv8.7-a IIRC.