Extended precision
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Not to be confused with arbitrary-precision arithmetic.
Extended precision refers to floating-point number formats that provide greater precision than the basic floating-point formats.[1] Extended precision formats support a basic format by minimizing roundoff and overflow errors in intermediate values of expressions on the base format. In contrast to extended precision, arbitrary-precision arithmetic refers to implementations of much larger numeric types (with a storage count that usually is not a power of two) using special software (or, rarely, hardware).