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arXiv cs/0210015math.NAcs.NA
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区间算术的新进展及其对浮点标准化的影响

New Developments in Interval Arithmetic and Their Implications for Floating-Point Standardization

M. H. van Emden

AI总结:

本文探讨了与浮点运算同速的区间算术处理器前景,通过完整阐述区间算术新进展,指出IEEE标准中定向舍入和带符号零除法的价值,并认为无需NaN和异常,非规格化数在区间算术中无益。

摘要:

我们考虑一种处理器的前景,该处理器能够以与传统浮点算术相同的速度执行区间算术。这使得所有算术运算都可以通过区间方法获得更优越的安全性,而无需在速度上付出任何代价。在这种情况下,IEEE浮点标准需要与一种为区间算术目的而理想的浮点算术版本进行比较。这样的比较需要对区间算术及其最新进展进行简洁而完整的阐述。我们在本文中提供了这样的阐述。我们得出结论,朝向无穷大的定向舍入以及带符号零的除法定义是标准中有价值的特性。由于区间算术的运算总是有定义的,因此不会出现异常。因此,既不需要NaN也不需要异常。在状态标志中,只有不精确标志可能有用。非规格化数似乎对区间算术没有用处;在区间约束的使用中,它们是一个障碍。

英文摘要:

We consider the prospect of a processor that can perform interval arithmetic at the same speed as conventional floating-point arithmetic. This makes it possible for all arithmetic to be performed with the superior security of interval methods without any penalty in speed. In such a situation the IEEE floating-point standard needs to be compared with a version of floating-point arithmetic that is ideal for the purpose of interval arithmetic. Such a comparison requires a succinct and complete exposition of interval arithmetic according to its recent developments. We present such an exposition in this paper. We conclude that the directed roundings toward the infinities and the definition of division by the signed zeros are valuable features of the standard. Because the operations of interval arithmetic are always defined, exceptions do not arise. As a result neither Nans nor exceptions are needed. Of the status flags, only the inexact flag may be useful. Denormalized numbers seem to have no use for interval arithmetic; in the use of interval constraints, they are a handicap.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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