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The current PyLong implementation represents arbitrary precision integers in units of 15 or 30 bits. I presume the purpose is to avoid overflow in addition , subtraction and multiplication. But compilers these days offer intrinsics that allow one to access the overflow flag, and to obtain the result of 64 bit multiplication as a 128 bit number. Or at least on x86-64, which is the dominant platform. Any reason why it is not done? If it is only because no one bothers, I may be able to do it.Â
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