c++ - 如何将 _m128 SSE 寄存器数据存储在 "unsigned char"数组上？

Question

我是 SSE 新手，到目前为止，你已经设法从 unsigned char 数组加载，但我不知道如何存储结果。请帮助我。

void calculate_borders_parallel( unsigned char *src, unsigned char *dst, int width, int height )
  {
      // TO DO
      __m128i sourceUp;
      __m128i sourceDown;
      __m128i destiny;

#pragma omp parallel for

     for (int j = 1; j<height; j++)
     {
         for (int i = 0; i<width; i+=4)
         {

             sourceUp = _mm_loadu_si128( (const __m128i*)&src[(j-1)*width+i] );
             sourceDown = _mm_loadu_si128( (const __m128i*)&src[(j+1)*width+i] );
             destiny = _mm_subs_epu8(sourceDown, sourceUp);

             _mm_store_si128( &dst[(j+0)*width+i], destiny );  // <----- ERROR HERE .. cannot convert from __m128i to unsigned char


         }
     }

Answer 1

你必须这样做:

*(__m128i *)&dst[idx]

取消引用已转换为 vector 数组的地址。