i searched for that snippet of assembly, it looks like this in `objdump -dr -M intel liblzma_la-crc64-fast.o`:
```
  c4:   48 89 02                mov    QWORD PTR [rdx],rax
  c7:   ff 15 00 00 00 00       call   QWORD PTR [rip+0x0]        # cd <.Llzma_block_param_encoder.0+0x59>
                        c9: R_X86_64_GOTPCREL   _cpuid-0x4
  cd:   48 8b 54 24 08          mov    rdx,QWORD PTR [rsp+0x8]
  d2:   4c 89 22                mov    QWORD PTR [rdx],r12
  d5:   48 83 c4 28             add    rsp,0x28
  d9:   41 5c                   pop    r12
  db:   c3                      ret
```
so yes, it looks like it confirms your finding that it calls _cpuid