------- Comment #3 from fxcoudert at gcc dot gnu dot org 2009-05-04 19:37 ------- About POPCNT and POPPAR, beware! Implementations are much harder than simply using the GCC __builtin_popcount{,l,ll}: see PR40019 for similar issue with LEADZ and TRAILZ.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38282