[PATCH] D155145: [X86] Add AVX-VNNI-INT16 instructions.

[Anna Thomas via Phabricator via cfe-commits]

anna added a comment.

We see a crash bisected to this patch about using an illegal instruction. 
Here's the CPUInfo for the machine:

  CPU info:
  current cpu id: 22
  total 32(physical cores 16) (assigned logical cores 32) (assigned physical cores 16) (assigned_sockets:2 of 2) (8 cores per cpu, 2 threads per core) family 6 model 45 stepping 7 microcode 0x71a, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, vzeroupper, avx, aes, clmul, ht, tsc, tscinvbit, tscinv, clflush
  AvgLoads: 0.30, 0.10, 0.18
  CPU Model and flags from /proc/cpuinfo:
  model name      : Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz
  flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm ida arat pln pts md_clear flush_l1d
  Online cpus: 0-31
  Offline cpus:
  BIOS frequency limitation: <Not Available>
  Frequency switch latency (ns): 20000
  Available cpu frequencies: <Not Available>
  Current governor: schedutil
  Core performance/turbo boost: <Not Available>

I don't see `avxvnniint16` in the flags list nor avx2. So, this (relatively new) instruction shouldn't be generated for this machine. Any ideas on why this might be happening?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155145/new/

https://reviews.llvm.org/D155145