/// <summary>
/// All of the conditional jump instructions call this method. When a conditional jump is
/// decoded onto the queue, four operations are queued (see <see cref="Addr_Relative"/>).
/// If the condition fails and the jump is not being taken, this method will dequeue the
/// next three operations and queue a new operation that simply increments <c>PC</c> and
/// fetches the next instruction. If the jump is being taken, then this method sets the
/// address latch to <c>PC + 1</c>. This way, to find the destination of the jump, just add
/// the offset from the instruction's operand and add it to the address latch.
/// </summary>
/// <param name="takingJump">A boolean that says whether the jump is being taken. Pass <c>true</c> if the branch condition succeeds and the jump is being taken. Otherwise, pass <c>false</c>.</param>
private static void PerformConditionalJumpOperation(Cpu cpu, bool takingJump)
{
if (!takingJump)
{
cpu.Queue.Dequeue();
cpu.Queue.Dequeue();
cpu.Queue.Dequeue();
cpu.AddOperation(true, &Operations.FetchInstruction);
}
// Save PC + 1 into address latch because it will get clobbered.
cpu.AddressLatchLow = (byte)((cpu.CpuState.PC + 1) & 0xff);
cpu.AddressLatchHigh = (byte)((cpu.CpuState.PC + 1) >> 8);
}
