在Visual Studio中检测SSE/SSE2指令集的可用性 [英] Detect the availability of SSE/SSE2 instruction set in Visual Studio

问题描述

如何在代码中检查Visual Studio编译器是否启用了SSE/SSE2?

How can I check in code whether SSE/SSE2 is enabled or not by the Visual Studio compiler?

我尝试了#ifdef __SSE__，但是没有用.

I have tried #ifdef __SSE__ but it didn't work.

推荐答案

来自

_M_IX86_FP

_M_IX86_FP

扩展为一个值，该值指示使用了哪个/arch 编译器选项:

Expands to a value indicating which /arch compiler option was used:

如果使用/arch:IA32 ，则
• 0.
• 如果使用/arch:SSE ，则为1.
如果使用/arch:SSE2 ，则为
• 2.如果未指定/arch ，则此值为默认值.

• 0 if /arch:IA32 was used.
• 1 if /arch:SSE was used.
• 2 if /arch:SSE2 was used. This value is the default if /arch was not specified.

我没有提到_SSE_.

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