impl/

Source: https://stackoverflow.com/q/8590432/142239 Source: http://www.stmintz.com/ccc/index.php?id=94570

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop0)

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop1) Source: java.lang.Integer#bitCount Source: http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/lang/Integer.java#Integer.bitCount%28int%29 Source: java.lang.Long#bitCount Source: http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/lang/Long.java#Long.bitCount%28long%29

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop1 + alternative) Source: https://github.com/gcc-mirror/gcc/blob/master/libgcc/libgcc2.c#L840-L859 Source: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36041#c8

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop2)

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop2 + alternative)

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop3)

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop5)

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop4)

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop5a)

Source: http://www.hackersdelight.org/hdcodetxt/pop.c.txt (pop6)