https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54571
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- The `popcount(nz) == 1` comment part of PR 103216 will fix this issue.
[Bug middle-end/54571] Missed optimization converting between bit sets
pinskia at gcc dot gnu.org via Gcc-bugs Wed, 07 Jun 2023 08:21:42 -0700
