The code to autodetect x86 CPU model runs the cpuid instruction after setting
up 1 in eax. This gives the processor signature back in eax which encodes the
model number.
As per Intel Application Note 485 and AMD publication #25481, when deriving
model, we should look at both the base model in e
We've rpm.i686 installed in a chroot on an Icelake host.
And on trying to install a `x86_64` rpm with `setarch x86_64 rpm -i` we're
getting a `is intended for a different architecture` error.
```
# setarch x86_64 rpm -i glibc.x86_64.rpm nss-softokn-freebl.x86_64.rpm
warning: nss-softokn-freebl.x8
