Commit 90d8b4b5 authored by Raymond Toy's avatar Raymond Toy

Bignum multiply without consing temp space

The current bignum multiplier creates temp space to hold the absolute
value of the bignums and then negates the result (in-place) at the
end.

Instead, use the algorithm from Hacker's Delight that pretends the
numbers are unsigned, does the unsigned multiply and finally corrects
the result.  No extra memory is needed for this.
parent 23e31483
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