c++ - AVX convert 64 bit integer to 64 bit float -


i convert 4 packed 64 bit integers 4 packed 64 bit floats using avx. i've tried 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 display in debugger:

(gdb) print packed $4 = {1234, 5678, 9012, 3456}

okay far, cast/conversion operation can find _mm256i_castsi256_pd, doesn't me 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 see is:

(gdb) print pd $5 = {1234.0, 5678.0, 9012.0, 3456.0}

all of cast intrinsics perform bitwise cast, why you're not seeing meaningful results that.

a vector conversion (the cvt intrinsics) between 64-bit integer , 64-bit float not exist.


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