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[/] [s80186/] [trunk/] [sim/] [cppmodel/] [instructions/] [loopnz.cpp] - Blame information for rev 2

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1 2 jamieiles
// Copyright Jamie Iles, 2017
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//
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// This file is part of s80x86.
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//
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// s80x86 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// s80x86 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with s80x86.  If not, see <http://www.gnu.org/licenses/>.
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void EmulatorPimpl::loopnze0()
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{
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    int16_t displacement = static_cast<int8_t>(fetch_byte());
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    registers->set(CX, registers->get(CX) - 1);
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    if (registers->get(CX) != 0 && !registers->get_flag(ZF)) {
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        registers->set(IP, registers->get(IP) + instr_length + displacement);
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        jump_taken = true;
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    }
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}

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