Is there a way to see the native code produced by theJITter for given C# / CIL?

Question

In a comment on this answer (which suggests using bit-shift operators over integer multiplication / division, for performance), I queried whether this would actually be fast

Answer 1

You won't get meaningful results until you configure the debugger. Tools + Options, Debugging, General, turn off "Suppress JIT optimization on module load". Switch to the Release mode configuration. A sample snippet:

static void Main(string[] args) {
  int value = 4;
  int result = divideby2(value);
}

You are doing it right if the disassembly looks like this:

00000000  ret  

You'll have to fool the JIT optimizer to force the expression to be evaluated. Using Console.WriteLine(variable) can help. Then you ought to see something like this:

0000000a  mov         edx,2 
0000000f  mov         eax,dword ptr [ecx] 
00000011  call        dword ptr [eax+000000BCh] 

Yup, it evaluated the result at compile time. Works pretty well, doesn't it.