双 - IEEE 754替代品 [英] Double - IEEE 754 alternatives

问题描述

根据以下网站：
http://en.cppreference.com/w/cpp / language / types

双精度浮点类型。通常IEEE-754 64位浮点类型。

"double - double precision floating point type. Usually IEEE-754 64 bit floating point type".

它说通常。 C ++ double 使用什么其他可能的格式/标准？什么编译器使用IEEE格式的替代？或架构？

It says "usually". What other possible formats/standard could C++ double use? What compiler uses an alternative to the IEEE format? Or architecture?

推荐答案

Vaxen，Crays和IBM大型机，仅举几例，大多数（所有？）的那些也可以做IEEE浮点，但有时只有一个特殊的附加。在其他情况下（IBM），IEEE算法可能带来显着的速度损失。

Vaxen, Crays, and IBM mainframes, to name just a few that are still in reasonably wide use. Most (all?) of those can also do IEEE floating point now, but sometimes only with a special add-on. In other cases (IBM) IEEE arithmetic can carry a significant speed penalty.

对于旧机器，大多数大型机（Unisys，Control Data等）格式，其中大多数不像IEEE，更不用说实际上符合。

As for older machines, most mainframes (Unisys, Control Data, etc.) used unique floating point formats, most of which weren't even much like IEEE, not to mention actually conforming.

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