为抽取bayer格式图像的r\g\b做准备
#include <iostream> #include <intrin.h> int main() { uint8_t uint8_array[16] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; //内存顺序0 1 2 __m128i a = _mm_load_si128((__m128i*)uint8_array); //内存顺序0 1 2 __m128i b = _mm_set_epi8(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15); //内存顺序15 14 13,注意此函数是反序 __m128i c = _mm_shuffle_epi8(a, b); //按b索引对a重排,b第一个索引15对应a的15 uint8_t* uint8_result = (uint8_t*)&c; //15 14 13 for (int i = 0; i < 16; i++) { std::cout << (int)uint8_result[i] << "\n"; } //对a重排,前一半是所有奇数位,后一半是所有偶数位 __m128i oe = _mm_set_epi8(15, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 0); __m128i oe_result = _mm_shuffle_epi8(a, oe); uint8_t* uint8_oe_result = (uint8_t*)&oe_result; for (int i = 0; i < 16; i++) { std::cout << (int)uint8_oe_result[i] << "\n"; } uint8_t o_result[8], e_result[8]; memcpy(o_result, uint8_oe_result, 8 * sizeof(uint8_t)); //所有奇数位的元素 memcpy(e_result, uint8_oe_result+8, 8 * sizeof(uint8_t)); //所有偶数位的元素 }
标签:__,13,15,14,uint8,偶数,m128i,指令集,CPU From: https://www.cnblogs.com/xixixing/p/18246942