[Mono-dev] amd64 SSE2 Sqrt patch

[Jonathan Chambers]

Hello,
      Inspired by the patch for an SSE2 implementation of Abs (
http://permalink.gmane.org/gmane.comp.gnome.mono.patches/111238), I tried
Sqrt. This is only my 2nd JIT patch and my first involving an SSE intrinsic
so any reviews would be appreciated. I see about a 14% speedup using the
following benchmark (with N=1000000000):

using System;

class Program
{
        static void Main(string[] args)
        {
                int count = int.Parse(args[0]);
                double d = 1.0;
                for (int i = 0; i < count;i++)
                {
                        d = Math.Sqrt(i);
                }
                Console.WriteLine(d);
        }
}

I ran it 10 times and get average time of:

Orig
30.5517s

SSE
26.1512s

Code is contributed under MIT/X11

Thanks,
Jonathan
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