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digitalmars.D.learn - Tuple vs struct performance?

Do you know the cause of the large (something like 3 times, latest dmd, -O
-release -inline) difference in performance in this program from using a tuple
or a struct with the same fields (the two alternative lines near the top)?

http://codepad.org/dLLdgrq8

I have tried in various ways to understand the cause, but I have not found it
yet.

Bye and thank you,
bearophile
Aug 08 2011