 IEEE arithmetic in Oracle's Numerical Computation Guide

Official technical manual: IEEE Arithmetic.

Relevant locators: IEEE Arithmetic Model, significand precision and overall bit count; Double Format, field layout and Table 2-5; and Ranges and Precisions in Decimal Representation. The source describes the traditional IEEE double format, now called binary64. It supports the precision and storage calculations for the double-precision floating-point format; no claim about a current processor's execution speed is inferred.