Getting supported CPU instructions on Windows

windows_cpu_flags.rb

require 'ruby-wmi'

ECX_FLAGS = [
  'SSE3',
  'PCLMULQDQ',
  'DTES64',
  'MONITOR',
  'DS-CPL',
  'VMX',
  'SMX',
  'EIST',
  'TM2',
  'SSSE3',
  'CNXT-ID',
  'SDBG',
  'FMA',
  'CMPXCHG16B',
  'xTPR Update Control',
  'PDCM',
  nil,
  'PCID',
  'DCA',
  'SSE4.1',
  'SSE4.2',
  'x2APIC',
  'MOVBE',
  'POPCNT',
  'TSC-Deadline',
  'AESNI',
  'XSAVE',
  'OSXSAVE',
  'AVX',
  'F16C',
  'RDRAND',
  nil
].freeze

EDX_FLAGS = [
  'FPU',
  'VME',
  'DE',
  'PSE',
  'TSC',
  'MSR',
  'PAE',
  'MCE',
  'CX8',
  'APIC',
  nil,
  'SEP',
  'MTRR',
  'PGE',
  'MCA',
  'CMOV',
  'PAT',
  'PSE-36',
  'PSN',
  'CLFSH',
  nil,
  'DS',
  'ACPI',
  'MMX',
  'FXSR',
  'SSE',
  'SSE2',
  'SS',
  'HTT',
  'TM',
  nil,
  'PBE'
].freeze

def parse_struct_for_cpu_flags(type, _formatted_length, _handle, data)
  return unless type == 4
  ecx = data[8..11]
  edx = data[12..15]
  ecx_bit_array = edx.map { |d| d.to_s(2) }.join
  edx_bit_array = edx.map { |d| d.to_s(2) }.join
  i = 0
  flags = []
  until i == 32
    flags = flags << EDX_FLAGS[i] if edx_bit_array[i].to_i == 1 && EDX_FLAGS[i]
    flags = flags << ECX_FLAGS[i] if ecx_bit_array[i].to_i == 1 && ECX_FLAGS[i]
    i += 1
  end
  flags
end

def parse_smbios_for_cpu_flags(bios)
  i = 0
  until i >= bios.length
    type = bios[i]
    formatted_length = bios[i + 1]
    handle = bios[i + 2] + bios[i + 3]
    start = i
    i += formatted_length
    check_1 = nil
    check_2 = nil
    until (i >= bios.length) || (check_1 == 0 && check_2 == 0)
      check_1 = bios[i]
      check_2 = bios[i + 1]
      i += 1
    end
    parsed = parse_struct_for_cpu_flags type, formatted_length, handle, bios[start + 1..i - 2]
    return parsed if parsed
    i += 1
  end
end

def smbios
  @smbios ||= WMI::MSSmBios_RawSMBiosTables.find(:all, namespace: 'ROOT\WMI')[0].SMBiosData
end

puts parse_smbios_for_cpu_flags(smbios)