Answer by jbat100 for How to check if a number is a power of 2

Mark gravell suggested this if you have .NET Core 3, System.Runtime.Intrinsics.X86.Popcnt.PopCount

public bool IsPowerOfTwo(uint i){    return Popcnt.PopCount(i) == 1}

Single instruction, faster than (x != 0) && ((x & (x - 1)) == 0) but less portable.