https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97759
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |crazylht at gmail dot com
Target| |x86_64-*-* i?86-*-*
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think using popcount () in the standard library is reasonable and instead
GCC should eventually optimize popcount () == 1 during RTL expansion. An
alternative would be to add an explicit __builtin_is_pow2 (). Note
matching popcount (x) == 1 || x == 0 for the simple arithmetic trick would
be always good IMHO.
