rol

fnT rol(T)(const T value, const uint count) if (__traits(isIntegral, T) && __traits(isUnsigned, T)) pure

Bitwise rotate value left (rol) or right (ror) by count bit positions.

fnT rol(uint count, T)(const T value) if (__traits(isIntegral, T) && __traits(isUnsigned, T)) pure

ditto