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extended precision
Extended precision refers to floating point number formats that provide greater precision and more exponent range than the basic floating point formats.〔 defines ''extended precision format'' as "A format that extends a supported basic format by providing wider precision and range."〕 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).
==Extended precision implementations==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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