From: Mark Wooding <mdw@distorted.org.uk>
Date: Mon, 5 Aug 2013 20:13:48 +0000 (+0100)
Subject: math/mpreduce.c: Add extensive commentary.
X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/commitdiff_plain/21f82da45054e310c8294c44bb071d7317089e74?hp=21f82da45054e310c8294c44bb071d7317089e74

math/mpreduce.c: Add extensive commentary.

The behaviour of this code must have been something of a mystery.  It's
not arbitrary, but it is a little subtle in places.  Add a full
explanation of the whole thing.
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