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math/scaf.c, etc.: Only need 3*NPIECE words of scratch space.
author
Mark Wooding
<mdw@distorted.org.uk>
Fri, 29 Sep 2017 21:25:32 +0000
(22:25 +0100)
committer
Mark Wooding
<mdw@distorted.org.uk>
Fri, 29 Sep 2017 21:25:32 +0000
(22:25 +0100)
The extra one would have been necessary because we're calculating the
high half of a product of two (NPIECE + 1)-piece numbers, but in fact we
only need the low NPIECE pieces of the result.
Fix the commentary and the callers.
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