Is there an easy way to diff two fragments of code in two buffers?

I have two buffers open in vim. I want to compare a subroutine that's 
present in both buffers for differences. I don't care about the rest of the 
two files, they're very different. I only care about this subroutine. Is 
there an easy way to diff just this part of the code? I could go into 
Visual mode, yank the subroutine of buffer1, create a new file in my temp 
directory called sub_buffer1.txt, Put the code, save it, then switch to 
buffer2, go to visual mode, yank that buffer's subroutine code, create a 
new file in my temp directory called sub_buffer2.txt, Put that code, save 
it, exit Vim, then run vimdiff on sub_buffer1.txt and sub_buffer2.txt. Is 
there an easier way?

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