Subversion Repositories s80186

// Copyright Jamie Iles, 2017

//

// This file is part of s80x86.

//

// s80x86 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 3 of the License, or

// (at your option) any later version.

//

// s80x86 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 s80x86.  If not, see <http://www.gnu.org/licenses/>.

// neg byte r/m

void EmulatorPimpl::negf6()

{

    auto v = read_data<uint8_t>();

    uint16_t flags;

    uint8_t result;

    std::tie(flags, result) = do_sub<uint8_t>(0, v);

    flags &= ~CF;

    if (v != 0)

        flags |= CF;

    write_data<uint8_t>(result);

    registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);

}

// neg word r/m

void EmulatorPimpl::negf7()

{

    auto v = read_data<uint16_t>();

    uint16_t flags;

    uint16_t result;

    std::tie(flags, result) = do_sub<uint16_t>(0, v);

    flags &= ~CF;

    if (v != 0)

        flags |= CF;

    write_data<uint16_t>(result);

    registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);

}