Why is Math.DivRem so inefficient?

Question

In my computer this code takes 17 seconds (1000 millions times):

static void Main(string[] args) {
   var sw = new Stopwatch(); sw.Start();
   int r;
   for          


        

Answer 1

Grrr. The only reason for this function to exist is to take advantage of the CPU instruction for this, and they didn't even do it!