* Stephen John Smoogen:

> I used this
> https://unix.stackexchange.com/questions/631217/how-do-i-check-if-my-cpu-supports-x86-64-v2
> to see what cpu instructions are at each level
>
> ```
> #!/usr/bin/awk -f
>
> BEGIN {
>     while (!/flags/) if (getline < "/proc/cpuinfo" != 1) exit 1
>     if (/lm/&&/cmov/&&/cx8/&&/fpu/&&/fxsr/&&/mmx/&&/syscall/&&/sse2/) level = 1
>     if (level == 1 && /cx16/&&/lahf/&&/popcnt/&&/sse4_1/&&/sse4_2/&&/ssse3/) level = 2
>     if (level == 2 && /avx/&&/avx2/&&/bmi1/&&/bmi2/&&/f16c/&&/fma/&&/abm/&&/movbe/&&/xsave/) level = 3
>     if (level == 3 && /avx512f/&&/avx512bw/&&/avx512cd/&&/avx512dq/&&/avx512vl/) level = 4
>     if (level > 0) { print "CPU supports x86-64-v" level; exit level + 1 }
>     exit 1
> }
> ```

Hmm.  I believe the script is almost correct, not sure about “xsave” part.
The “fma” match is problematic because it also applies to “fma4”, which
is definitely not correct.

On Fedora 34 or later, you can use “/lib64/ld-linux-x86-64.so.2 --help”.
If x86-64-v2 shows up as “supported”, there is compatibile:

| Subdirectories of glibc-hwcaps directories, in priority order:
|   x86-64-v4
|   x86-64-v3 (supported, searched)
|   x86-64-v2 (supported, searched)

On older Fedora, you can run:

  podman run fedora:latest /lib64/ld-linux-x86-64.so.2 --help

Thanks,
Florian