[Bug tree-optimization/111791] RISC-V: Strange loop vectorizaion on popcount function

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111791

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
It does do that (if there's a POPCOUNT optab, that is).  Replacing with
__builtin_popcount would eventually lead to an infinite recursion in this case
;) (see that old memcpy + ldist bug)