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Couple of small Register16 adjustments

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This commit is contained in:
Adrian Conlon
2025-05-11 21:30:15 +01:00
parent 36e983526e
commit 8331b4818e
2 changed files with 15 additions and 20 deletions
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2
EightBit/Processor.cs
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@@ -311,7 +311,7 @@ namespace EightBit
this.SetWord(value); this.SetWord(value);
} }
protected void Jump(ushort destination) => this.PC.Assign(destination); protected void Jump(ushort destination) => this.PC.Word = destination;
protected void Jump(Register16 destination) => this.PC.Assign(destination); protected void Jump(Register16 destination) => this.PC.Assign(destination);

33
EightBit/Register16.cs
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@@ -4,6 +4,7 @@
namespace EightBit namespace EightBit
{ {
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices; using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Explicit, Size = 2)] [StructLayout(LayoutKind.Explicit, Size = 2)]
@@ -20,7 +21,7 @@ namespace EightBit
public Register16(ushort value) public Register16(ushort value)
{ {
this.Assign(value); this.Word = value;
} }
public Register16() public Register16()
@@ -48,19 +49,22 @@ namespace EightBit
this.High = rhs.High; this.High = rhs.High;
} }
public ushort Word public unsafe ushort Word
{ {
get get
{ {
unsafe fixed (byte* bytes = &this._low)
{ {
fixed (byte* bytes = &this._low) return *(ushort*)bytes;
{ }
return *(ushort*)bytes; }
} set
{
fixed (byte* bytes = &this._low)
{
*(ushort*)bytes = value;
} }
} }
set => this.Assign(value);
} }
public ref byte Low => ref this._low; public ref byte Low => ref this._low;
@@ -88,19 +92,10 @@ namespace EightBit
this.Assign(from.Low, from.High); this.Assign(from.Low, from.High);
} }
public void Assign(ushort from) [MethodImpl(MethodImplOptions.AggressiveInlining)]
{
unsafe
{
fixed (byte* bytes = &this._low)
{
*(ushort*)bytes = from;
}
}
}
public ushort Increment() => this.Word++; public ushort Increment() => this.Word++;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ushort Decrement() => this.Word--; public ushort Decrement() => this.Word--;
} }
} }