Half-Unit-Biased (HUB) is an emerging format
based on shifting the represented numbers by half Unit in the
Last Place. This format simplifies two’s complement and roundto-
nearest operations by preventing any carry propagation. This
saves power consumption, time and area. Taking into account
that the IEEE floating-point standard uses an unbiased rounding
as the default mode, this feature is also desirable for HUB
approaches. In this paper, we study the unbiased rounding for
HUB floating-point addition in both as standalone operation and
within FMA. We show two different alternatives to eliminate the
bias when rounding the sum results, either partially or totally.
We also present an error analysis and the implementation results
of the proposed architectures to help the designers to decide what
their best option are.
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