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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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EightBit/IntelProcessor.cs
+45 -49
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@@ -13,10 +13,6 @@ namespace EightBit
private readonly IntelOpCodeDecoded[] decodedOpCodes = new IntelOpCodeDecoded[0x100];
private Register16 sp = new Register16((ushort)Mask.Mask16);
private Register16 memptr = new Register16((ushort)Mask.Mask16);
private PinLevel haltLine;
protected IntelProcessor(Bus bus)
@@ -36,36 +32,36 @@ namespace EightBit
public event EventHandler<EventArgs> LoweredHALT;
public Register16 SP { get; } = new Register16((ushort)Mask.Mask16);
public Register16 MEMPTR { get; } = new Register16((ushort)Mask.Mask16);
public abstract Register16 AF { get; }
public byte A { get => this.AF.High; set => this.AF.High = value; }
public byte F { get => this.AF.Low; set => this.AF.Low = value; }
public abstract Register16 BC { get; }
public byte B { get => this.BC.High; set => this.BC.High = value; }
public byte C { get => this.BC.Low; set => this.BC.Low = value; }
public abstract Register16 DE { get; }
public byte D { get => this.DE.High; set => this.DE.High = value; }
public byte E { get => this.DE.Low; set => this.DE.Low = value; }
public abstract Register16 HL { get; }
public byte H { get => this.HL.High; set => this.HL.High = value; }
public byte L { get => this.HL.Low; set => this.HL.Low = value; }
protected bool Halted => this.HALT().Lowered();
public ref Register16 SP() => ref this.sp;
public ref Register16 MEMPTR() => ref this.memptr;
public abstract ref Register16 AF();
public ref byte A() => ref this.AF().High;
public ref byte F() => ref this.AF().Low;
public abstract ref Register16 BC();
public ref byte B() => ref this.BC().High;
public ref byte C() => ref this.BC().Low;
public abstract ref Register16 DE();
public ref byte D() => ref this.DE().High;
public ref byte E() => ref this.DE().Low;
public abstract ref Register16 HL();
public ref byte H() => ref this.HL().High;
public ref byte L() => ref this.HL().Low;
public ref PinLevel HALT() => ref this.haltLine;
public IntelOpCodeDecoded GetDecodedOpCode(byte opCode) => this.decodedOpCodes[opCode];
@@ -74,7 +70,7 @@ namespace EightBit
{
base.RaisePOWER();
this.RaiseHALT();
this.SP().Word = this.AF().Word = this.BC().Word = this.DE().Word = this.HL().Word = (ushort)Mask.Mask16;
this.SP.Word = this.AF.Word = this.BC.Word = this.DE.Word = this.HL.Word = (ushort)Mask.Mask16;
}
public virtual void RaiseHALT()
@@ -122,38 +118,38 @@ namespace EightBit
this.Jump(0);
}
protected sealed override void Push(byte value) => this.Bus.Write(--this.SP(), value);
protected sealed override void Push(byte value) => this.Bus.Write(--this.SP.Word, value);
protected sealed override byte Pop() => this.Bus.Read(this.SP()++);
protected sealed override byte Pop() => this.Bus.Read(this.SP.Word++);
protected sealed override Register16 GetWord()
{
var returned = base.GetWord();
this.MEMPTR().Word = this.Bus.Address().Word;
this.MEMPTR.Word = this.Bus.Address.Word;
return returned;
}
protected sealed override void SetWord(Register16 value)
{
base.SetWord(value);
this.MEMPTR().Word = this.Bus.Address().Word;
this.MEMPTR.Word = this.Bus.Address.Word;
}
////
protected void Restart(byte address)
{
this.MEMPTR().Low = address;
this.MEMPTR().High = 0;
this.Call(this.MEMPTR());
this.MEMPTR.Low = address;
this.MEMPTR.High = 0;
this.Call(this.MEMPTR);
}
protected bool CallConditional(bool condition)
{
this.MEMPTR().Word = this.FetchWord().Word;
this.MEMPTR.Word = this.FetchWord().Word;
if (condition)
{
this.Call(this.MEMPTR());
this.Call(this.MEMPTR);
}
return condition;
@@ -161,10 +157,10 @@ namespace EightBit
protected bool JumpConditional(bool condition)
{
this.MEMPTR().Word = this.FetchWord().Word;
this.MEMPTR.Word = this.FetchWord().Word;
if (condition)
{
this.Jump(this.MEMPTR());
this.Jump(this.MEMPTR);
}
return condition;
@@ -182,8 +178,8 @@ namespace EightBit
protected void JumpRelative(sbyte offset)
{
this.MEMPTR().Word = (ushort)(this.PC().Word + offset);
this.Jump(this.MEMPTR());
this.MEMPTR.Word = (ushort)(this.PC.Word + offset);
this.Jump(this.MEMPTR);
}
protected bool JumpRelativeConditional(bool condition)
@@ -200,18 +196,18 @@ namespace EightBit
protected override sealed void Return()
{
base.Return();
this.MEMPTR().Word = this.PC().Word;
this.MEMPTR.Word = this.PC.Word;
}
protected void Halt()
{
--this.PC();
--this.PC.Word;
this.LowerHALT();
}
protected void Proceed()
{
++this.PC();
++this.PC.Word;
this.RaiseHALT();
}
}