[LLVM] Expose Host CPU Feature Detection

[junrushao]

A small script that exposes host CPU name, target triple and features:

import tvm

def main():
    get_default_target_triple = tvm._ffi.get_global_func("tvm.codegen.llvm.GetDefaultTargetTriple")
    get_process_triple = tvm._ffi.get_global_func("tvm.codegen.llvm.GetProcessTriple")
    get_host_cpu_name = tvm._ffi.get_global_func("tvm.codegen.llvm.GetHostCPUName")
    get_host_cpu_features = tvm._ffi.get_global_func("tvm.codegen.llvm.GetHostCPUFeatures")

    target_triple = get_default_target_triple()
    process_triple = get_process_triple()
    host_cpu_name = get_host_cpu_name()
    host_cpu_features = get_host_cpu_features()

    print("target_triple: {}".format(target_triple))
    print("process_triple: {}".format(process_triple))
    print("host_cpu_name: {}".format(host_cpu_name))
    print("host_cpu_features:")
    for name, value in host_cpu_features.items():
        print("  {}: {}".format(name, bool(value)))


if __name__ == "__main__":
    main()

Output (AMD CPU):

target_triple: x86_64-unknown-linux-gnu
process_triple: x86_64-unknown-linux-gnu
host_cpu_name: znver2
host_cpu_features:
  xsaveopt: True
  tsxldtrk: False
  sse: True
  movdiri: False
  mmx: True
  pku: False
  amx-int8: False
  amx-tile: False
  rdpid: True
  avx512vbmi2: False
  cmov: True
  widekl: False
  f16c: True
  bmi: True
  gfni: False
  avx512cd: False
  movdir64b: False
  rdseed: True
  clwb: True
  avx512er: False
  avx512f: False
  sse4.2: True
  avxifma: False
  sse2: True
  avx512vp2intersect: False
  prfchw: True
  avx512pf: False
  vaes: False
  waitpkg: False
  amx-bf16: False
  prefetchi: False
  uintr: False
  fxsr: True
  bmi2: True
  lzcnt: True
  avx512vbmi: False
  avx512bf16: False
  prefetchwt1: False
  xsaves: True
  movbe: True
  rtm: False
  pclmul: True
  hreset: False
  sahf: True
  fma4: False
  xop: False
  vpclmulqdq: False
  sgx: False
  avx512vnni: False
  popcnt: True
  xsavec: True
  aes: True
  avx512vpopcntdq: False
  kl: False
  avx512bitalg: False
  xsave: True
  avxvnni: False
  raoint: False
  clflushopt: True
  sse4a: True
  avx512bw: False
  cx16: True
  avxvnniint8: False
  amx-fp16: False
  cldemote: False
  rdrnd: True
  ptwrite: False
  rdpru: True
  avx: True
  adx: True
  avx512vl: False
  pconfig: False
  shstk: False
  64bit: True
  crc32: True
  sha: True
  cmpccxadd: False
  tbm: False
  serialize: False
  mwaitx: True
  avx512ifma: False
  avx512fp16: False
  clzero: True
  avx2: True
  cx8: True
  fma: True
  lwp: False
  enqcmd: False
  wbnoinvd: True
  sse4.1: True
  avx512dq: False
  ssse3: True
  fsgsbase: True
  invpcid: False
  sse3: True
  avxneconvert: False

Note that LLVM doesn't guarantee automatic feature detection always succeeds, particularly for newer CPU models and older LLVM builds (e.g. M2 CPU + LLVM 16), the result is usually inaccurate. In this case, i.e. CPU feature detection fails, we will print a warning message and return an empty dict instead.

To properly detect CPU features on macbook, the commands below provided by the system are the most accurate:

sysctl -a machdep.cpu
sysctl -a hw.optional

On linux, usually it is recommended to directly query via:

cat /proc/cpuinfo

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