[Cfp-interest] TS 18661-4/N1785 - Reduction functions, correct rounding

[David Hough CFP]

Hong Diep Nguyen at Berkeley has been working on reproducible reductions.
Not correctly rounded, but almost so.

http://www.eecs.berkeley.edu/~hdnguyen/

http://www.eecs.berkeley.edu/~hdnguyen/public/papers/repsum.pdf

http://bebop.cs.berkeley.edu/rblas