AVX512 architecture build fails with older GCC compilers.

[gvreuls]

The merge of PR #2962 introduced the _mm512_zextsi256_si512 intrinsic for AVX512 builds. The definition of this and other intrinsics is missing in the file avx512fintrin.h for GCC compilers older than version 10.

I tried including avx512fintrin.h directly (which is not best practice) in PR #2974 but this only looked like a fix due to my dodgy git practices, the only workaround right now is to use GCC 10 (or clang).

[vondele]

right, in addition to g++-10, also works with clang++-9 and clang++-10

[mstembera]

According to https://software.intel.com/sites/landingpage/IntrinsicsGuide _mm512_zextsi256_si512 is part of the base AVX512F instructions and supposed to be declared in <immintrin.h> which we include. I can write a version w/o it however. Is that how we want to proceed?

[vondele]

You propose again something conditional on the gcc version ? Depends a bit if this is easy or invasive, and if it is performance wise similar or not.

[Vizvezdenec]

no offense but what the fuck is this.
https://i.imgur.com/Rr9VnVx.png

[vondele]

@Vizvezdenec no idea, you'll need to give more info. Obviously something specific to your setup / local changes?
Edit: also not related to this issue, so open a new one if that's needed

[Vizvezdenec]

I did update to the latest master and this is what it's returning with make of anything.
Well I do "make" with arch 64 and stuff and when I try to do bench it returns this

[Vizvezdenec]

Hm, okay, I did make clean and then usual build path and it started to work. No idea what it was, it's the first time I've seen smth like this.

[mstembera]

@gvreuls @vondele Can you try this #2976