optimization - Can I check if the C# compiler inlined a method call?

Question

I'm writing an XNA game where I do per-pixel collision checks. The loop which checks this does so by shifting an int and bitwise ORing and is generally difficult to read and understand.

I would like to add private methods such as private bool IsTransparent(int pixelColorValue) to make the loop more readable, but I don't want the overhead of method calls since this is very performance sensitive code.

Is there a way to force the compiler to inline this call or will I do I just hope that the compiler will do this optimization?

If there isn't a way to force this, is there a way to check if the method was inlined, short of reading the disassembly? Will the method show up in reflection if it was inlined and no other callers exist?

Edit: I can't force it, so can I detect it?

Answer 1

No you can't. Even more, the one who decides on inlining isn't VS compiler that takes you code and converts it into IL, but JIT compiler that takes IL and converts it to machine code. This is because only the JIT compiler knows enough about the processor architecture to decide if putting a method inline is appropriate as it’s a tradeoff between instruction pipelining and cache size.

So even looking in .NET Reflector will not help you.