--- Comment #6 from Don <> 2011-09-27 12:20:31 PDT ---
My theory is not correct. I figured that I could check if the number of
iterations was wrong by using rdtsc to see how many instructions are executed.
But it shows nothing unusual.
I'm no longer convinced that this is a loopback issue.
I also found that if I include a writefln after the relevant code, the critical
length of the loop drops from 64 (0x40) to 40 (0x28). It doesn't seem to be
affected by code alignment, so it's not a cache line issue.
This whole thing is very, very strange.

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