编程：SIMD简介

詹令
lealzhan@126.com
2016.6.30

介绍

todo

Code

//代码示例
#include <xmmintrin.h>    //128bit
#include <emmintrin.h>   //256bit, 同时包含 128bit(xmmintrin.h)

//定义一个16个byte（128bit or 4 float）对齐的数组
__declspec(align(16)) float A[]={2.0f, 1.0f, 3.0f,4.0f}; // 16-->32,  float-->double
__declspec(align(16)) float B[]={2.0f, 1.0f, 3.0f,4.0f}; // 16-->32,  float-->double
__declspec(align(16)) float C[]={0.0f, 0.0f, 0.0f,0.0f}; // 16-->32,  float-->double

//将该数组传递给__m128
__m128 a = _mm_load_ps(&A[0]); //__m128d, _mm_load_pd
__m128 b = _mm_load_ps(&B[0]); //__m128d, _mm_load_pd
__m128 c; //__m128d

//进行numb次加法计算
for(int i=0;i<numb;i++){
	c = _mm_add_ps(a,b);
}

//将__m128传递给数组C
_mm_store_ps(&C[0],c);
//打印
std::cout<<C[0]<<C[1]<<C[2]<<C[3]<<std::endl;