I'm guessing that the expected behavior is
    >>> struct.calcsize('idi')
    20
because the double should be aligned to an 8-byte boundary.
This is the case on my linux/x86_64 machine:
    $ python -c 'import struct; print struct.calcsize("idi")'
    20
I don't know much about 'itanium', but i'd be surprised if they
chose 4-byte alignment for doubles.

http://h21007.www2.hp.com/dspp/tech/tech_TechDocumentDetailPage_IDX/1,1701,180,00.html

Jeff

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