#include "xmmintrin.h" #include <iostream> using namespace std; void main() { __declspec(align(16)) float Input1[4] = {1.0,2.0,3.0,4.0}; __declspec(align(16)) float Input2[4] = {5.0,6.0,7.0,8.0}; __declspec(align(16)) float Result[4]; __m128 a = _mm_load_ps(Input1); __m128 b = _mm_load_ps(Input2); __m128 c = _mm_add_ps(a,b); _mm_store_ps(Result,c); cout<<a.m128_f32[0]<<" "<<a.m128_f32[1]<<" " <<a.m128_f32[2]<<" "<<a.m128_f32[3]<<endl; cout<<b.m128_f32[0]<<" "<<b.m128_f32[1]<<" " <<b.m128_f32[2]<<" "<<b.m128_f32[3]<<endl; cout<<c.m128_f32[0]<<" "<<c.m128_f32[1]<<" " <<c.m128_f32[2]<<" "<<c.m128_f32[3]<<endl; for(int i=0;i<4;i++) { cout<<Result[i]<<" "; } cout<<endl; getchar(); }
时间: 2024-02-20 22:58:51 浏览: 77
这段代码使用了SSE指令集实现了四个单精度浮点数的加法运算,可以在支持SSE指令集的CPU上使用。下面是代码的运行结果:
```
1 2 3 4
5 6 7 8
6 8 10 12
6 8 10 12
```
请问您有什么其他问题吗?
相关问题
这段代码改错#include "xmmintrin.h" #include <iostream> using namespace std; void main() { __declspec(align(16)) float Input1[4] = {1.0,2.0,3.0,4.0}; __declspec(align(16)) float Input2[4] = {5.0,6.0,7.0,8.0}; __declspec(align(16)) float Result[4]; __m128 a = _mm_load_ps(Input1); __m128 b = _mm_load_ps(Input2); __m128 c = _mm_add_ps(a,b); _mm_store_ps(Result,c); cout<<a.m128_f32[0]<<" "<<a.m128_f32[1]<<" " <<a.m128_f32[2]<<" "<<a.m128_f32[3]<<endl; cout<<b.m128_f32[0]<<" "<<b.m128_f32[1]<<" " <<b.m128_f32[2]<<" "<<b.m128_f32[3]<<endl; cout<<c.m128_f32[0]<<" "<<c.m128_f32[1]<<" " <<c.m128_f32[2]<<" "<<c.m128_f32[3]<<endl; for(int i=0;i<4;i++) { cout<<Result[i]<<" "; } cout<<endl; getchar(); }
这段代码需要做以下改动:
1. `void main()` 应改为 `int main()`,并在函数末尾返回一个整型值,例如 `return 0;`。
2. 头文件 `xmmintrin.h` 应放在头文件 `iostream` 之前。
3. 应在代码开头加入 `#include <cstdlib>`,以便使用 `getchar()` 函数。
修改后的代码如下所示:
```c++
#include <xmmintrin.h>
#include <iostream>
#include <cstdlib>
using namespace std;
int main() {
__declspec(align(16)) float Input1[4] = {1.0,2.0,3.0,4.0};
__declspec(align(16)) float Input2[4] = {5.0,6.0,7.0,8.0};
__declspec(align(16)) float Result[4];
__m128 a = _mm_load_ps(Input1);
__m128 b = _mm_load_ps(Input2);
__m128 c = _mm_add_ps(a,b);
_mm_store_ps(Result,c);
cout<<a.m128_f32[0]<<" "<<a.m128_f32[1]<<" " <<a.m128_f32[2]<<" "<<a.m128_f32[3]<<endl;
cout<<b.m128_f32[0]<<" "<<b.m128_f32[1]<<" " <<b.m128_f32[2]<<" "<<b.m128_f32[3]<<endl;
cout<<c.m128_f32[0]<<" "<<c.m128_f32[1]<<" " <<c.m128_f32[2]<<" "<<c.m128_f32[3]<<endl;
for(int i=0;i<4;i++) {
cout<<Result[i]<<" ";
}
cout<<endl;
getchar();
return 0;
}
```
代码改错#include <xmmintrin.h> #include <iostream> #include <cstdlib> using namespace std; int main() { __declspec(align(16)) float Input1[4] = {1.0,2.0,3.0,4.0}; __declspec(align(16)) float Input2[4] = {5.0,6.0,7.0,8.0}; __declspec(align(16)) float Result[4]; __m128 a = _mm_load_ps(Input1); __m128 b = _mm_load_ps(Input2); __m128 c = _mm_add_ps(a,b); _mm_store_ps(Result,c); cout<<a.m128_f32[0]<<" "<<a.m128_f32[1]<<" " <<a.m128_f32[2]<<" "<<a.m128_f32[3]<<endl; cout<<b.m128_f32[0]<<" "<<b.m128_f32[1]<<" " <<b.m128_f32[2]<<" "<<b.m128_f32[3]<<endl; cout<<c.m128_f32[0]<<" "<<c.m128_f32[1]<<" " <<c.m128_f32[2]<<" "<<c.m128_f32[3]<<endl; for(int i=0;i<4;i++) { cout<<Result[i]<<" "; } cout<<endl; getchar(); return 0; }
这段代码没有明显的错误,但可以做一些改进:
- 可以使用常量指针来表示 `Input1` 和 `Input2` 数组,因为它们的值不会在程序中被修改。
- 可以使用 `const` 修饰符来修饰 `Result` 数组,因为它们的值只会被程序写入,而不会被修改。
- 可以添加一些注释来解释代码的作用,以便其他人能够更容易地理解代码。
改进后的代码如下:
```c++
#include <xmmintrin.h>
#include <iostream>
#include <cstdlib>
using namespace std;
int main() {
// 定义两个包含四个浮点数的数组
const float* Input1 = {1.0, 2.0, 3.0, 4.0};
const float* Input2 = {5.0, 6.0, 7.0, 8.0};
// 定义一个包含四个浮点数的数组,用于存储结果
alignas(16) const float Result[4] = {};
// 使用 SSE 指令集中的向量操作进行加法运算
__m128 a = _mm_load_ps(Input1);
__m128 b = _mm_load_ps(Input2);
__m128 c = _mm_add_ps(a, b);
_mm_store_ps(Result, c);
// 输出数组的值
cout << "Input1:";
for (int i = 0; i < 4; i++) {
cout << " " << Input1[i];
}
cout << endl;
cout << "Input2:";
for (int i = 0; i < 4; i++) {
cout << " " << Input2[i];
}
cout << endl;
cout << "Result:";
for (int i = 0; i < 4; i++) {
cout << " " << Result[i];
}
cout << endl;
getchar();
return 0;
}
```
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