计算机体系结构Lab5 - CodiMD1

static int sum_vectorized(int n, int *a)

{

int sum = 0;

int sum_vect[4];

__m128i _sum = _mm_setzero_si128();

for (int i = 0; i < n / 4 * 4; i += 4)

_sum = _mm_add_epi32(_sum,_mm_loadu_si128((__m128i*)(a+i)));

_mm_storeu_si128((__m128i*)sum_vect,_sum);

for(int i = 0;i<4;i++)

sum += sum_vect[i];