report_supported_x86_64_micro_arch.yaml

---
- name: Determine which x86-64 micro-architecture level is supported on each host
  hosts:
    - all

  gather_facts: true
  gather_subset:
    - platform

  vars:
    micro_arch_requirements:
      # https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/d725a37222da8468dd37564f40005138449621d8/x86-64-ABI/low-level-sys-info.tex#L14-57
      # as well as the unofficial `x86-64-v2-aes` ("v2.5") which is `x86-64-v2` plus `aes`
      x86-64: ['cmov', 'cx8', 'fpu', 'fxsr', 'mmx', 'sse', 'sse2', 'syscall']
      x86-64-v2: ['cx16', 'lahf_lm', 'popcnt', 'sse4_1', 'sse4_2', 'ssse3']
      x86-64-v2-aes: ['aes', 'cx16', 'lahf_lm', 'popcnt', 'sse4_1', 'sse4_2', 'ssse3']
      x86-64-v3: ['abm', 'avx', 'avx2', 'bmi1', 'bmi2', 'f16c', 'fma', 'movbe', 'xsave']
      x86-64-v4: ['avx512bw', 'avx512cd', 'avx512dq', 'avx512f', 'avx512vl']

  pre_tasks:
    - name: Proceed on Linux systems with x86_64 machine architecture only
      ansible.builtin.meta: end_host
      when:
        - ansible_facts['system'] not in ['Linux'] or
          ansible_facts['machine'] not in ['x86_64']

  tasks:
    - name: Load all CPU flags from /proc/cpuinfo
      ansible.builtin.command:
        cmd: >-
          env LC_ALL=C grep -Po '^flags\s*:\s\K.*' /proc/cpuinfo
      register: all_cpu_flags
      changed_when: false
      check_mode: false

    - name: Generate distinct list of supported CPU flags
      ansible.builtin.set_fact:
        supported_cpu_flags: "{{ all_cpu_flags['stdout_lines'] | join | split(' ') | sort | unique }}"

    - name: Check for required CPU flags of each micro architecture
      ansible.builtin.set_fact:
        supported_micro_archs: "{{ supported_micro_archs | d({}) | combine({inventory_hostname: {_micro_arch: _is_supported}}, recursive=true) }}"
      vars:
        _micro_arch: "{{ item[0] }}"
        _required_flags: "{{ item[1] }}"
        _is_supported: "{{ _required_flags | difference(supported_cpu_flags) | length == 0 | bool }}"
      loop: "{{ micro_arch_requirements | dictsort }}"
      loop_control:
        label: "{{ _micro_arch }}"

    - name: Report results
      ansible.builtin.debug:
        msg: |-
          {{ supported_micro_archs }}

    - name: Prepare Ansible statistics reporting if enabled
      ansible.builtin.set_stats:
        data:
          supported_micro_archs: "{{ supported_micro_archs }}"
        aggregate: true
      when:
        - lookup('ansible.builtin.config', 'SHOW_CUSTOM_STATS') | bool