Why does _mm_stream_ps produce L1/LL cache misses?

Question

I\'m trying to optimize a computation-intensive algorithm and am kind of stuck at some cache problem. I have a huge buffer which is written occasionally and at random and read o

Answer 1

Shouldn't func4 be this:

void func4() {
    __m128 buf = _mm_setr_ps(5.0f, 5.0f, 5.0f, 5.0f);
    for(int i = 0; i < length; i += 16) {
        _mm_stream_ps(&arr[i], buf);
        _mm_stream_ps(&arr[i+4], buf);
        _mm_stream_ps(&arr[i+8], buf);
        _mm_stream_ps(&arr[i+12], buf);
    }
}