[Bug libstdc++/97759] Could std::has_single_bit be faster?

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97759

--- Comment #16 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Summary:
pop(a) CMP 1 || a == 0
  CMP       TGT
  ==      pop(a) <= 1
  !=      pop(a) != 1
  >       pop(a) != 1
  >=      true
  <       a == 0
  <=      pop(a) <= 1

pop(a) CMP 1 || a != 0
  CMP       TGT
  ==      a != 0
  !=      true
  >       a != 0
  >=      a != 0
  <       true
  <=      true