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# -*- coding: utf-8 -*-
#
# AWL simulator - instructions
#
# Copyright 2012-2013 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from awlsim.instructions.main import *
class AwlInsn_MU_I(AwlInsn):
def __init__(self, cpu, rawInsn):
AwlInsn.__init__(self, cpu, AwlInsn.TYPE_MU_I, rawInsn)
self.assertOpCount(0)
def run(self):
s = self.cpu.statusWord
prod = self.cpu.accu2.getSignedWord() *\
self.cpu.accu1.getSignedWord()
self.cpu.accu1.setDWord(prod)
if self.cpu.is4accu:
self.cpu.accu2.setDWord(self.cpu.accu3.getDWord())
self.cpu.accu3.setDWord(self.cpu.accu4.getDWord())
if prod == 0:
s.A1, s.A0, s.OV = 0, 0, 0
elif prod < 0:
s.A1, s.A0, s.OV = 0, 1, 0
else:
s.A1, s.A0, s.OV = 1, 0, 0
if prod > 0x7FFF or prod < -32768:
s.OV, s.OS = 1, 1
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