[Bug middle-end/126634] hwint.h pow2_or_zerop/pow2p_hwi could use popcount_hwi if supported.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D126634

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Why do you think it is a good idea?  It seems exact deoptimization in the
common case.
popcount on many hosts is even a library call and even if it is not, popcou=
nt
instruction is rarely a win over what least_bit_hwi does.
Only gcc r14-5612 and newer can actually optimize __builtin_popcountll (x) =
=3D=3D 1
back to something smarter.=