So I had problems with this toy example to learn how to program using the built-in SSE. I read other topics here that sometimes segmentation errors using the _mm_load_ps function are caused by misalignment, but I think it should be resolved by the attribute(( aligned (16))) item that I did. Also, when I comment on line 23 or 24 (or both) in my code, the problem disappears, but obviously this makes the code inoperative.
#include <iostream>
using namespace std;
int main()
{
float temp1[] __attribute__((__aligned__(16))) = {1.1,1.2,1.3,14.5,3.1,5.2,2.3,3.4};
float temp2[] __attribute__((__aligned__(16))) = {1.2,2.3,3.4,3.5,1.2,2.3,4.2,2.2};
float temp3[8];
__m128 m, *m_result;
__m128 arr1 = _mm_load_ps(temp1);
__m128 arr2 = _mm_load_ps(temp2);
m = _mm_mul_ps(arr1, arr2);
*m_result = _mm_add_ps(m, m);
_mm_store_ps(temp3, *m_result);
for(int i = 0; i < 4; i++)
{
cout << temp3[i] << endl;
}
m_result++;
arr1 = _mm_load_ps(temp1+4);
arr2 = _mm_load_ps(temp2+4);
m = _mm_mul_ps(arr1, arr2);
*m_result = _mm_add_ps(m,m);
_mm_store_ps(temp3, *m_result);
for(int i = 0; i < 4; i++)
{
cout << temp3[i] << endl;
}
return 0;
}
Line 23 - arr1 = _mm_load_ps (temp1 + 4). It’s strange that I can do one or the other, but not both. Any help would be appreciated, thanks!
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