如何在Visual Studio上启用__int128？ [英] How to enable __int128 on Visual Studio?

问题描述

当在Visual Studio中的C ++项目中键入 __ int128 时，编辑器将 __ int128 的颜色更改为蓝色

When I type __int128 in a C++ project in Visual Studio, the editor changes color of __int128 to blue (like keyword).

但是当我编译源代码时，会出现以下错误：

But when I compile the source, the folowing error appears:

error C4235: 
nonstandard extension used : '__int128' keyword not supported on this architecture

$ b b

如何在Visual Studio上启用 __ int128 ？

推荐答案

MSDN 未将其列为可用，并且此近期< a href =http://connect.microsoft.com/VisualStudio/feedback/details/529171/implement-128-bit-type =nofollow>响应同意，所以正式，不，有没有类型 __ int128 ，并且无法启用。

MSDN doesn't list it as being available, and this recent response agrees, so officially, no, there is no type called __int128 and it can't be enabled.

此外，不要信任语法hilighter;它是用户可编辑的，因此可能有假的或未来类型。 （它可能是一个保留字，然而，由于错误，因此你应该避免命名任何类型 __ int128 ，这遵循约定，任何前缀双下划线应保留为编译器使用）。

Additionally, never trust the syntax hilighter; it is user editable, and thus likely to either have bogus or 'future' types in it. (it is probably a reserved word however, due to the error, thus you should avoid naming any types __int128, this follows the convention that anything prefixed with a double underscore should reserved for compiler use).

可以认为 __ int128 可能在x64 / IPF机器上通过寄存器跨越 __ in64 位于32位目标上，但现在只有 128位类型来自SIMD类型（ __ m128 及其各种类型的表单）。

One would think the __int128 might be available on x64/IPF machines via register spanning, like __in64 is on 32bit targets, but right now the only 128 bit types stem from SIMD types (__m128 and its various typed forms).

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