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Make Register16 a class, rather than struct. Tricky, but a bit faster than before.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon
2019-02-21 19:58:49 +00:00
parent b7fbb80018
commit 27e1c5c9f8
15 changed files with 502 additions and 472 deletions
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27
EightBit/Processor.cs
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@@ -10,7 +10,6 @@ namespace EightBit
{
private PinLevel resetLine;
private PinLevel intLine;
private Register16 pc;
protected Processor(Bus memory)
{
@@ -35,9 +34,9 @@ namespace EightBit
public Bus Bus { get; }
protected byte OpCode { get; set; }
public Register16 PC { get; } = new Register16();
public ref Register16 PC() => ref this.pc;
protected byte OpCode { get; set; }
public ref PinLevel RESET() => ref this.resetLine;
@@ -118,14 +117,14 @@ namespace EightBit
protected void BusWrite(byte low, byte high, byte data)
{
this.Bus.Address().Low = low;
this.Bus.Address().High = high;
this.Bus.Address.Low = low;
this.Bus.Address.High = high;
this.BusWrite(data);
}
protected void BusWrite(ushort address, byte data)
{
this.Bus.Address().Word = address;
this.Bus.Address.Word = address;
this.BusWrite(data);
}
@@ -141,14 +140,14 @@ namespace EightBit
protected byte BusRead(byte low, byte high)
{
this.Bus.Address().Low = low;
this.Bus.Address().High = high;
this.Bus.Address.Low = low;
this.Bus.Address.High = high;
return this.BusRead();
}
protected byte BusRead(ushort address)
{
this.Bus.Address().Word = address;
this.Bus.Address.Word = address;
return this.BusRead();
}
@@ -156,7 +155,7 @@ namespace EightBit
protected virtual byte BusRead() => this.Bus.Read(); // N.B. Should be the only real call into the "Bus.Read" code.
protected byte FetchByte() => this.BusRead(this.PC()++);
protected byte FetchByte() => this.BusRead(this.PC.Word++);
protected abstract Register16 GetWord();
@@ -178,23 +177,23 @@ namespace EightBit
protected Register16 GetWord(ushort address)
{
this.Bus.Address().Word = address;
this.Bus.Address.Word = address;
return this.GetWord();
}
protected void SetWord(ushort address, Register16 value)
{
this.Bus.Address().Word = address;
this.Bus.Address.Word = address;
this.SetWord(value);
}
protected void Jump(ushort destination) => this.PC().Word = destination;
protected void Jump(ushort destination) => this.PC.Word = destination;
protected void Jump(Register16 destination) => this.Jump(destination.Word);
protected void Call(ushort destination)
{
this.PushWord(this.PC());
this.PushWord(this.PC);
this.Jump(destination);
}