More granular performance profiling?

[Jarrett Billingsley]

I'd like to profile some code (the MiniD interpreter to be exact), but 
the -profile flag for DMD only profiles down to the function level.  This 
obviously doesn't help much when considering that the interpreter is 
basically one big function with a while loop in it.

Short of splitting the interpreter function into several smaller functions 
to profile it, is there any way to get more granular performance profiling? 
A library or such?