https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90838
Wilco <wdijkstr at arm dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wdijkstr at arm dot com
--- Comment #2 from Wilco <wdijkstr at arm dot com> ---
(In reply to Jakub Jelinek from comment #1)
> __builtin_ctzll is undefined for 0, while the above is well defined and
> returns 0.
When the target ctz is well defined and returns 64 for 0, and we want to return
0 instead, this will work:
__builtin_ctzll (b) & 63
