[llvm-dev] LLVM and Xeon Skylake v5

[Andy Schneider via llvm-dev]

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