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IBM hexadecimal floating-point
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== Arithmetic operations == Available arithmetic operations are add and subtract, both normalized and unnormalized, and compare. Prenormalization is done based on the exponent difference. Multiply and divide prenormalize unnormalized values, and truncate the result after one guard digit. There is a halve operation to simplify dividing by two. Starting in ESA/390, there is a square root operation. All operations have one hexadecimal guard digit to avoid precision loss. Most arithmetic operations truncate like simple pocket calculators. Therefore, 1 β 16<sup>β8</sup> = 1. In this case, the result is rounded away from zero.<ref>[http://public.dhe.ibm.com/software/websphere/awdtools/hlasm/sh93fpov.pdf ESA/390 Enhanced Floating Point Support: An Overview]</ref>
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