[llvm-dev] LLVM and Xeon Skylake v5

[Craig Topper via llvm-dev]

I can try to help.

Are you passing a CPU string or are you letting it autodetect the CPU using
getHostCPUName? I don't see support detecting skylake or even avx-512
support in the autodetection code that far back. Are you doing the same
thing for the i7 kabylake? How did you disable AVX-512 code gen?

~Craig

On Mon, May 8, 2017 at 9:21 AM, Andy Schneider via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
> I have a JIT compiler using the legacy JIT on LLVM 3.5 that, when run on
> the Xeon v5 Skylakes produces "Cannot select: intrinsic %
> llvm.x86.sse41.round.sd". Note, this does not occur on i7 Kabylakes. To
> get this far I had to disable AVX512 code gen.
>
> Upgrading the system I am looking at from 3.5 to a later version is a big
> job that I'd prefer not to have on my critical path.
>
> Does anyone have any tips on where I would look to debug this sort of
> issue? I'm new to LLVM.
>
> Thanks
>
> Andy
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