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Tidy register increment/decrement a little.

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This commit is contained in:
Adrian Conlon
2025-07-25 16:32:30 +01:00
parent c271b28495
commit 2f338c6c46
10 changed files with 68 additions and 58 deletions
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LR35902/IoRegisters.cs
+1 -1
View File
@@ -150,7 +150,7 @@ namespace LR35902
public void IncrementDIV()
{
this.divCounter.Increment();
_ = this.divCounter.Increment();
this.Poke(DIV, this.divCounter.High);
}
LR35902/LR35902.cs
+33 -25
View File
@@ -553,36 +553,50 @@ namespace LR35902
switch (p)
{
case 0: // LD (BC),A
this.MemoryWrite(this.BC, this.A);
this.Bus.Address.Assign(this.BC);
break;
case 1: // LD (DE),A
this.MemoryWrite(this.DE, this.A);
this.Bus.Address.Assign(this.DE);
break;
case 2: // GB: LDI (HL),A
this.MemoryWrite(this.HL.Increment(), this.A);
this.Bus.Address.Assign(this.HL);
_ = this.HL.Increment();
break;
case 3: // GB: LDD (HL),A
this.MemoryWrite(this.HL.Decrement(), this.A);
this.Bus.Address.Assign(this.HL);
_ = this.HL.Decrement();
break;
default:
throw new InvalidOperationException("Invalid operation mode");
}
this.MemoryWrite(this.A);
break;
case 1:
this.A = p switch
switch(p)
{
0 => this.MemoryRead(this.BC), // LD A,(BC)
1 => this.MemoryRead(this.DE), // LD A,(DE)
2 => this.MemoryRead(this.HL.Increment()), // GB: LDI A,(HL)
3 => this.MemoryRead(this.HL.Decrement()), // GB: LDD A,(HL)
_ => throw new InvalidOperationException("Invalid operation mode"),
};
case 0: // LD A,(BC)
this.Bus.Address.Assign(this.BC);
break;
case 1: // LD A,(DE)
this.Bus.Address.Assign(this.DE);
break;
case 2: // GB: LDI A,(HL)
this.Bus.Address.Assign(this.HL);
_ = this.HL.Increment();
break;
case 3: // GB: LDD A,(HL)
this.Bus.Address.Assign(this.HL);
_ = this.HL.Decrement();
break;
default:
throw new InvalidOperationException("Invalid operation mode");
}
this.A = this.MemoryRead();
break;
default:
@@ -592,20 +606,14 @@ namespace LR35902
break;
case 3: // 16-bit INC/DEC
switch (q)
_ = q switch
{
case 0: // INC rp
this.RP(p).Increment();
break;
case 1: // DEC rp
this.RP(p).Decrement();
break;
default:
throw new InvalidOperationException("Invalid operation mode");
}
// INC rp
0 => this.RP(p).Increment(),
// DEC rp
1 => this.RP(p).Decrement(),
_ => throw new InvalidOperationException("Invalid operation mode"),
};
this.TickMachine();
break;