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More work on minimising the effect of creating garbage collected objects.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-02-21 22:52:46 +00:00
parent 968b1c6545
commit 726c3fe4cc
2 changed files with 34 additions and 30 deletions
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32
EightBit/BigEndianProcessor.cs
View File

@ -5,6 +5,8 @@ namespace EightBit
{
public abstract class BigEndianProcessor : Processor
{
private readonly Register16 intermediate = new Register16();
protected BigEndianProcessor(Bus memory)
: base(memory)
{
@ -12,9 +14,9 @@ namespace EightBit
public override Register16 PeekWord(ushort address)
{
var high = this.Bus.Peek(address);
var low = this.Bus.Peek(++address);
return new Register16(low, high);
this.intermediate.High = this.Bus.Peek(address);
this.intermediate.Low = this.Bus.Peek(++address);
return this.intermediate;
}
public override void PokeWord(ushort address, Register16 value)
@ -25,31 +27,31 @@ namespace EightBit
protected override Register16 FetchWord()
{
var high = this.FetchByte();
var low = this.FetchByte();
return new Register16(low, high);
this.intermediate.High = this.FetchByte();
this.intermediate.Low = this.FetchByte();
return this.intermediate;
}
protected override Register16 GetWord()
{
var high = this.BusRead();
this.intermediate.High = this.BusRead();
++this.Bus.Address.Word;
var low = this.BusRead();
return new Register16(low, high);
this.intermediate.Low = this.BusRead();
return this.intermediate;
}
protected override Register16 GetWordPaged(byte page, byte offset)
{
var high = this.BusRead(offset, page);
var low = this.BusRead(++offset, page);
return new Register16(low, high);
this.intermediate.High = this.BusRead(offset, page);
this.intermediate.Low = this.BusRead(++offset, page);
return this.intermediate;
}
protected override Register16 PopWord()
{
var high = this.Pop();
var low = this.Pop();
return new Register16(low, high);
this.intermediate.High = this.Pop();
this.intermediate.Low = this.Pop();
return this.intermediate;
}
protected override void PushWord(Register16 value)

32
EightBit/LittleEndianProcessor.cs
View File

@ -6,6 +6,8 @@ namespace EightBit
{
public abstract class LittleEndianProcessor : Processor
{
private readonly Register16 intermediate = new Register16();
protected LittleEndianProcessor(Bus memory)
: base(memory)
{
@ -13,9 +15,9 @@ namespace EightBit
public override Register16 PeekWord(ushort address)
{
var low = this.Bus.Peek(address);
var high = this.Bus.Peek(++address);
return new Register16(low, high);
this.intermediate.Low = this.Bus.Peek(address);
this.intermediate.High = this.Bus.Peek(++address);
return this.intermediate;
}
public override void PokeWord(ushort address, Register16 value)
@ -26,31 +28,31 @@ namespace EightBit
protected override Register16 FetchWord()
{
var low = this.FetchByte();
var high = this.FetchByte();
return new Register16(low, high);
this.intermediate.Low = this.FetchByte();
this.intermediate.High = this.FetchByte();
return this.intermediate;
}
protected override Register16 GetWord()
{
var low = this.BusRead();
this.intermediate.Low = this.BusRead();
++this.Bus.Address.Word;
var high = this.BusRead();
return new Register16(low, high);
this.intermediate.High = this.BusRead();
return this.intermediate;
}
protected override Register16 GetWordPaged(byte page, byte offset)
{
var low = this.BusRead(offset, page);
var high = this.BusRead(++offset, page);
return new Register16(low, high);
this.intermediate.Low = this.BusRead(offset, page);
this.intermediate.High = this.BusRead(++offset, page);
return this.intermediate;
}
protected override Register16 PopWord()
{
var low = this.Pop();
var high = this.Pop();
return new Register16(low, high);
this.intermediate.Low = this.Pop();
this.intermediate.High = this.Pop();
return this.intermediate;
}
protected override void PushWord(Register16 value)