Method: MicroCisc::Vm::Processor#ucisc

Defined in:

lib/micro_cisc/vm/processor.rb

#ucisc(word) ⇒ Object

# File 'lib/micro_cisc/vm/processor.rb', line 389

def ucisc(word)
  source = (word & SOURCE_MASK) >> SOURCE_SHIFT
  destination = (word & DESTINATION_MASK) >> DESTINATION_SHIFT
  effect = (word & EFFECT_MASK) >> EFFECT_SHIFT

  src =
    if source == 0
      '0.reg'
    elsif source < 4
      "#{source}.mem"
    elsif source == 4
      '4.val'
    else
      "#{source - 4}.reg"
    end

  dest =
    if destination == 0
      '0.reg'
    elsif destination < 4
      "#{destination}.mem"
    elsif destination == 4
      '4.reg'
    else
      "#{destination - 4}.reg"
    end

  # Eh?
  signed = !MEM_ARGS.include?(source)
  inc_is_immediate = signed && !MEM_ARGS.include?(destination)
  is_copy = (word & OP_MASK) == 0
  half_width = is_copy && MEM_ARGS.include?(source) && MEM_ARGS.include?(destination)
  immediates = extract_immediates(word, is_copy, inc_is_immediate, signed, half_width)

  value = source_value(source, immediates.first)
  store = store?(@flags, effect)

  alu = word & ALU_OP_MASK
  result = compute_result(is_copy, source, destination, immediates, alu, true)
  alu = is_copy ? '' : "0x#{alu.to_s(16).upcase}.op "

  imm0 = immediates.first < 0 ? "-#{(immediates.first * -1)}.imm" : "#{immediates.first}.imm"
  imm1 =
    if half_width
      immediates.last < 0 ? "-#{(immediates.last * -1)}.imm " : "#{immediates.last}.imm "
    else
      ""
    end
  eff = "#{effect}.eff"
  push = !inc_is_immediate && (word & INCREMENT_MASK) > 0
  push = push ? 'push ' : ''
  ins = is_copy ? 'copy' : 'compute'


  "Stack: #{stack_string}\n#{ins} #{alu}#{src} #{imm0} #{dest} #{imm1}#{eff} #{push}# value: #{value} (0x#{'%04x' % value}), result: #{result} (0x#{'%04x' % result}), #{'not ' if !store}stored"
end