Re: diffcore-rename performance mode

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Jeff King <peff@xxxxxxxx> writes:

> I thought we were holding counts of hashes, in which case there _is_ no
> overflow.

The raw hashval (the fingerprint recorded in struct spanhash) is
further reduced and used as an index into spahash_top.data[].
So more than one hashval can try to sit in the same slot in
spanhash_top.data[] array.
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