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Function core.bitop._popcnt

Calculates the number of set bits in an integer using the X86 SSE4 POPCNT instruction. POPCNT is not available on all X86 CPUs.

ushort _popcnt (
  ushort x
) pure nothrow @nogc @safe;

int _popcnt (
  uint x
) pure nothrow @nogc @safe;

int _popcnt (
  ulong x
) pure nothrow @nogc @safe;

Authors

Don Clugston, Sean Kelly, Walter Bright, Alex Rønne Petersen, Thomas Stuart Bockman

License

Boost License 1.0