SIMD: _mm256_cmpgt_epu8_mask

[CakeByTheOcean]

Hi everyone.
I have a little(maybe) question related with SIMD.
I would like just simply compare two 256 bit vector from 8 bit unsigned int. I found a perfect function _mm256_cmpgt_epu8_mask, which compares the two vector and give back a mask.
Unluckily this function (or Assembly) only work on AVX512VL + AVX512BW (only the server CPU).
My question is how can we achieve this comparing?
Is this _mm256_cmpgt_epu8_mask not possible for a normal Intel CPU?
Do we have some alternative solution to solve my problem?

/usr/lib/gcc/x86_64-linux-gnu/7/include/avx512vlbwintrin.h:3224:1: 
error: inlining failed in call to always_inline ‘__mmask32 _mm256_cmpgt_epu8_mask(__m256i, __m256i)’: target specific option mismatch

https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm256_cmpeq_epu8&expand=811

[Konstantin2]

Try use _mm256_cmpgt_epu8_mask in your progdam. If you get SIGILL signal, use simple memcmp.
(man 7 signal)

[colinhercus]

You can use __m256i _mm256_cmpgt_epi8 (__m256i a, __m256i b) to do the compare with AVX2 and then if you need to mask the results use an and.

[colinhercus]

Woops, you asked for unsigned. Sorry the above is for signed.