类似信息的CPUID的内在？ [英] Intrinsics for CPUID like informations?

问题描述

考虑到我用C ++编写代码，如果可能，我想使用类似Intrinsics的解决方案来读取有关硬件的有用信息，我的注意事项是：

• 我不知道程序集，这将是一个相当大的投资，只是为了获得这种信息（看起来像CPU只是关于翻转值和读取寄存器。）


• 至少有两种流行的语法用于asm（Intel和AT& T），所以它是分段的


• 奇怪的是Intrinsics比asm更受欢迎和支持


• 并不是所有的编译器在我的雷达现在支持inline asm，MSVC 64位是一个;恐怕我会发现其他类似的缺陷，同时挖掘更多的不同编译器的功能集，我必须使用。


• 考虑到我认为这是更有效的我对于Intrinsics来说，它应该也比任何一个asm代码更容易。

最后一个问题，我必须回答是：如何做一个类似的事情与内在的？因为我根本没有发现除了CPUID操作码之外没有任何其他信息。

解决方案

href =https://gcc.gnu.org/onlinedocs/gcc-4.8.4/gcc/X86-Built-in-Functions.html =nofollow>我发现一个有用的内置程序，

唯一的问题是这类函数真的有限（基本上你只有2个函数，1个用于CPU名称 1用于寄存器集合）

一个例子是

  include< stdio.h> 
 
 int main（）
 {
 if（__builtin_cpu_supports（mmx））{
 printf（\\\
I got MMX！\\\
）; 
} else 
 printf（\\\
What？MMX？这是什么？\\\
）; 
 return（0）; 
} 
  

显然这个内置函数也在mingw-w64下工作。 p>

Considering that I'm coding in C++, if possible, I would like to use an Intrinsics-like solution to read useful informations about the hardware, my concerns/considerations are:

• I don't know assembly that well, it will be a considerable investment just to get this kind of informations ( altough it looks like CPU it's just about flipping values and reading registers. )
• there at least 2 popular syntax for asm ( Intel and AT&T ), so it's fragmented
• strangely enough Intrinsics are more popular and supported than asm code this days
• not all the the compilers that are in my radar right now support inline asm, MSVC 64 bit is one; I'm afraid that I will find other similar flaws while digging more into the feature sets of the different compilers that I have to use.
• considering the trand I think that is more productive for me to bet on Intrinsics, it should be also way more easy than any asm code.

And the last question that I have to answer to is: how to do a similar thing with intrinsics ? Because I haven't found nothing other than CPUID opcodes to get this kind of informations at all.

解决方案

After some digging I have found a useful built-in functions that is gcc specific.

The only problem is that this kind of functions are really limited ( basically you have only 2 functions, 1 for the CPU "name" and 1 for the set of registers )

an example is

#include <stdio.h>

int main()
{
    if (__builtin_cpu_supports("mmx")) {
        printf("\nI got MMX !\n");
    } else
        printf("\nWhat ? MMX ? What is that ?\n");
    return (0);
}

and apparently this built-in functions work under mingw-w64 too.

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