Abstract
Implementors of the proposed standard, described in a special issue of the SIGNUM Newsletter (1) and in an article by J. Coonen in the IEEE Journal “COMPUTER” (2), are encouraged to provide two “directed rounding modes” by which the endpoints of intervals may be rounded outward automatically without unnecessarily spreading degenerate (one-point) intervals. This feature alone should bring the cost of interval arithmetic down by a substantial factor. Moreover, the standard provides symbols for infinity and specifies default responses to over/underflow in ways intended, among other things, to satisfy the needs of interval arithmetic. Finally, the standard is being implemented, options and all, by more than one major microcomputer manufacturer, so we will all get a chance soon to try it out.
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