[Python-Dev] Memory size overflows (original) (raw)

Tim Peters tim.one@comcast.net
Thu, 17 Oct 2002 18:29:39 -0400

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[Gerald S. Williams]

Well, I was done tweaking, but then I decided to try out one more performance tweak. This is in desperate need of commenting, but it's finally faster than checking via division on my machine: ...

If you've actually got the energy to time these things , how about adapting the int-mul overflow checking code in Python's intobject.c's int_mul() function too? The CVS (ditto 2.2.2) version

• does rely on floating point

• doesn't use division

• does work for signed integral types

• doesn't assume that the number of mantissa bits in a double is enough to hold a full-precision integral product

• does assume that the largest integral product is within the dynamic range of a double

It could be simplified a little if it were specialized to unsigned mult.

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