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Some performance updates

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This commit is contained in:
Adrian Conlon
2025-10-13 17:36:32 +01:00
parent ceacac4741
commit 33fce45cc8
3 changed files with 33 additions and 10 deletions
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34
EightBit/MemoryMapping.cs
View File

@@ -4,21 +4,43 @@
namespace EightBit
{
public sealed class MemoryMapping(Memory memory, ushort begin, ushort mask, AccessLevel access)
public sealed class MemoryMapping
{
public MemoryMapping(Memory memory, ushort begin, ushort mask, AccessLevel access)
{
this._memory = memory;
this._begin = begin;
this._mask = mask;
this._access = access;
for (int i = ushort.MinValue; i < ushort.MaxValue + 1; ++i)
{
System.Diagnostics.Debug.Assert(i >= ushort.MinValue);
System.Diagnostics.Debug.Assert(i <= ushort.MaxValue);
this._offsets[i] = this.CalculateOffset((ushort)i);
}
}
public MemoryMapping(Memory memory, ushort begin, Mask mask, AccessLevel access)
: this(memory, begin, (ushort)mask, access)
{
}
public Memory Memory { get; set; } = memory;
private readonly int[] _offsets = new int[ushort.MaxValue + 1];
private readonly Memory _memory;
private readonly ushort _begin;
private readonly ushort _mask;
private readonly AccessLevel _access;
public ushort Begin { get; set; } = begin;
public Memory Memory => this._memory;
public ushort Mask { get; set; } = mask;
public ushort Begin => this._begin;
public AccessLevel Access { get; set; } = access;
public ushort Mask => this._mask;
public int Offset(ushort absolute) => (absolute - this.Begin) & this.Mask;
public AccessLevel Access => this._access;
private int CalculateOffset(ushort absolute) => (absolute - this.Begin) & this.Mask;
public int Offset(ushort absolute) => this._offsets[absolute];
}
}

3
EightBit/Register16.cs
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@@ -89,7 +89,8 @@ namespace EightBit
public void Assign(Register16 from)
{
this.Assign(from.Low, from.High);
this.Low = from.Low;
this.High = from.High;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]

6
M6502/Core.cs
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@@ -972,11 +972,11 @@ namespace M6502
private void JSR()
{
this.Intermediate.Low = this.FetchByte();
var low = this.FetchByte();
this.SwallowPop();
this.PushWord(this.PC);
this.PC.High = this.FetchByte();
this.PC.Low = this.Intermediate.Low;
var high = this.FetchByte();
this.PC.Assign(low, high);
}
private void PHP() => this.Push(SetBit(this.P, StatusBits.BF));