检查运行时是否支持SSE

本文介绍了检查运行时是否支持SSE的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想在运行时检查是否支持SSE4或AVX，以便我的程序可以利用特定于处理器的指令，而无需为每个处理器创建二进制文件.

I would like to check if SSE4 or AVX is supported at runtime, so that my program may take advantage of processor specific instructions without creating a binary for each processor.

如果我可以在运行时确定它，则可以使用一个接口并在不同的指令集之间进行切换.

If I could determine it at runtime, I could use an interface and switch between different instruction sets.

推荐答案

GCC有一种方法，首先调用__builtin_cpu_init，然后调用__builtin_cpu_is和__builtin_cpu_supports来检查功能. gcc.gnu/onlinedocs/gcc- 4.8.2/gcc/X86-Built-in-Functions.html

GCC has a way of doing this that starts by calling __builtin_cpu_init then calling __builtin_cpu_is and __builtin_cpu_supports to check features. gcc.gnu/onlinedocs/gcc-4.8.2/gcc/X86-Built-in-Functions.html

在x86上，当使用C ++前端时，GCC支持功能多版本"，该功能允许您编写该功能的多个版本，指定应在其上使用的目标，并让GCC负责确保调用该功能. . gcc.gnu/onlinedocs/gcc-4.9.0/gcc/Function-Multiversioning.html

On x86, when using the C++ frontend, GCC supports "function multiversioning", which allows you to write multiple versions of the function, specify the target it should be used on, and let GCC take care of making sure it is called. gcc.gnu/onlinedocs/gcc-4.9.0/gcc/Function-Multiversioning.html