英特尔x86 SSE SIMD指令入门 [英] Getting started with Intel x86 SSE SIMD instructions

问题描述

我想了解有关使用 SSE 的更多信息.

I want to learn more about using the SSE.

除了可以轻松阅读英特尔®64和IA-32之外，还有哪些学习方法架构软件开发人员手册?

主要我有兴趣使用推荐答案

首先，我不建议您使用内置函数-它们不可移植(跨同一体系结构的编译器).

First, I don't recommend on using the built-in functions - they are not portable (across compilers of the same arch).

使用GCC

Use intrinsics, GCC does a wonderful job optimizing SSE intrinsics into even more optimized code. You can always have a peek at the assembly and see how to use SSE to it's full potential.

内部函数很简单-就像正常的函数调用一样:

Intrinsics are easy - just like normal function calls:

#include <immintrin.h>  // portable to all x86 compilers

int main()
{
    __m128 vector1 = _mm_set_ps(4.0, 3.0, 2.0, 1.0); // high element first, opposite of C array order.  Use _mm_setr_ps if you want "little endian" element order in the source.
    __m128 vector2 = _mm_set_ps(7.0, 8.0, 9.0, 0.0);

    __m128 sum = _mm_add_ps(vector1, vector2); // result = vector1 + vector 2

    vector1 = _mm_shuffle_ps(vector1, vector1, _MM_SHUFFLE(0,1,2,3));
    // vector1 is now (1, 2, 3, 4) (above shuffle reversed it)
    return 0;
}

使用_mm_load_ps或_mm_loadu_ps从数组中加载数据.

Use _mm_load_ps or _mm_loadu_ps to load data from arrays.

当然还有更多选择，SSE确实功能强大，我认为相对容易学习.

Of course there are way more options, SSE is really powerful and in my opinion relatively easy to learn.

另请参阅 https://stackoverflow.com/tags/sse/info 以获得一些指南链接.

See also https://stackoverflow.com/tags/sse/info for some links to guides.

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