GameBoy\Opcode::opcode138 PHP Method

    public static function opcode138(Core $core)
    {
        $dirtySum = $core->registerA + $core->registerD + ($core->FCarry ? 1 : 0);
        $core->FHalfCarry = ($core->registerA & 0xf) + ($core->registerD & 0xf) + ($core->FCarry ? 1 : 0) > 0xf;
        $core->FCarry = $dirtySum > 0xff;
        $core->registerA = $dirtySum & 0xff;
        $core->FZero = $core->registerA == 0;
        $core->FSubtract = false;
    }