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Good performance on a infinite number system?

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I''ve wrote a small (virtual) infinite number system (don''t know how to call it exactly) (only addition and multiplying with unsigned not floating point numbers). I''ve ran a test but don''t know if my performance is good or bad. Does somebody has wrote an infinite number system too and have some performance measuraments? I''ve calculated 2^131072 (=2^1024^128) in 61906 ms (39457 digits) and 2^65536 (=2^1024^64) in 15341 ms (19729 digits). Is this a bad or good performance? My test system is a P4 1,7Ghz, 100 mhz FSB with 512 MB PC800 RAM. Does somebody know how to difine such numbers?

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