Floating point reproducibility is a property
claimed by programmers and end users. Half-Unit-Biased
(HUB) is a new representation format in which the round
to nearest is carried out by truncation, preventing any carry
propagation and saving time and area. In this paper we study
the reproducible summation of HUB numbers by using a errorfree
vector transformation technique, providing both a specific
architecture and the usage of combined HUB/Standard floating
point adders to achieve a reproducible result