This should be true for all values of x, y, z, and w (when comparing to zero anyway)

equality_vs_bitwise_or.cs

int x=0;
int y=0;
int z=0;
int w=0;

var bitwise_or = (x | y | z | w) == 0;
var equality = x == 0 && y == 0 && z == 0 && w == 0;

System.Diagnostics.Debug.Assert(bitwise_or == equality);