Profile of common C constructs??

I'd like to know of any research done or papers written that profile what
constructs are most common in C programs. Something along the lines of:


      "Here at the Bleah and Bleah Institution, we've done static analysis of
      our C programs and found that roughly 90% of our statements are global
      variable declarations, and that 50% of the text in our source code is
      comments."


In particular, I'd be interested in anything that deals with this sort of
analysis and how it relates to trying to make a compilation faster.


Thanks for any pointers or references! (respond via email or post)


--
Scott Gilbert ( scott@cs.arizona.edu )
--

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