c++ - clang 是否有 _ExtFloat 就像它有 _ExtInt 一样？

Question

我最近一直在研究 clang 的 _ExtInt 功能(允许您声明任何大小的 int)，只是想知道是否还有一个 _ExtFloat 我可用于创建自定义大小的 float 。

Answer 1

不，事实并非如此。

作为引用，以下是 LLVM 开发人员在 Reddit 上被问及同一问题时的陈述 ( Source ):

We've actually discussed this, but they are incredibly difficult to specify. You need 3 different pieces of information, and they don't scale on different hardware well.

In the case of integers, you can do transitions with truncations/sign extensions, with floats you'd need a large software library to convert floats of unsupported sizes.