(LLVM) Invalid instruction exception on Skylake CPUs

[AniLeo]

#2145 (comment)
http://www.emunewz.net/forum/showthread.php?tid=175430&pid=234029#pid234029

As referred above, opened an issue so it doesn't get forgotten.

[Nezarn]

Haswell is fine tho. (i have a i5 4690k)

[Nekotekina]

It's not SSSE3, it's invalid instruction (AVX-512 in this case)

[Nezarn]

Then how come after changing that line, LLVM worked on Skylake for that Chinese guy?

Also Skylake (i3,i5,i7) doesn't have AVX-512. (only Xeon and Canonlake CPUs (and canonlake isn't here until 2017 Q2)

[Nekotekina]

You misunderstand something

[Nekotekina]

Because this is exactly what I meant

[Nekotekina]

It's invalid instruction exactly because mentioned Skylake doesn't have AVX-512

[Nezarn]

Then how come LLVM works on Haswell? Haswell doesn't have AVX-512 either.

Or i have a magical CPU that has AVX-512? LOL.

[Nekotekina]

Because it's a bug in LLVM. When it compiles for haswell, it uses correct instructions.

[Nezarn]

Then why not use that workaround you posted in another issue? (or just update LLVM so maybe it got fixed in the meantime?)

[Nekotekina]

I will not test LLVM 3.9 immediately. Need to check its memory consumption, and this bug may be fixed as well. If it's fixed then we don't need any workaround.

[raven02]

@AniLeo , is this issue fixed by #2269 ?