我想转换4装64位整数4包装使用AVX 64位的花车。我已经试过类似：
int_64t 1！=（*的int64_t）_mm_malloc（256，32）;LS [0] = A;// ...LS [3] = D组;__mm256i包装= _mm256_load_si256（（__ m256i常量*）LS）;这将在调试器中显示：
（GDB）印刷包装$ 4 = {1234，5678，9012，3456}好了，到目前为止，但我能找到的唯一的投/转换操作是_mm256i_castsi256_pd，这并不让我我想要的：
__ m256d PD = _mm256_castsi256_pd（包装）;（GDB）打印PD$ 5 = {6.0967700696809824e-321，2.8053047370865979e-320，4.4525196003213139e-320，1.7074908720273481e-320}我真的很想看到的是：
（GDB）打印PD$ 5 = {1234.0，5678.0，9012.0，3456.0}解决方案
所有的投的内部函数执行按位投，这就是为什么你没有看到与有意义的结果。
一个矢量转换（即 CVT 的内部函数）的64位整数和64位浮点之间不存在。
I would like to convert 4 packed 64 bit integers to 4 packed 64 bit floats using AVX. I've tried something like:
int_64t *ls = (int64_t *) _mm_malloc(256, 32); ls[0] = a; //... ls[3] = d; __mm256i packed = _mm256_load_si256((__m256i const *)ls);Which will display in the debugger:
(gdb) print packed $4 = {1234, 5678, 9012, 3456}Okay so far, but the only cast/conversion operation that I can find is _mm256i_castsi256_pd, which doesn't get me what I want:
__m256d pd = _mm256_castsi256_pd(packed); (gdb) print pd $5 = {6.0967700696809824e-321, 2.8053047370865979e-320, 4.4525196003213139e-320, 1.7074908720273481e-320}What I'd really like to see is:
(gdb) print pd $5 = {1234.0, 5678.0, 9012.0, 3456.0}解决方案
All of the cast intrinsics perform a bitwise cast, which is why you're not seeing meaningful results with that.
A vector conversion (the cvt intrinsics) between 64-bit integer and 64-bit float does not exist.