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Use intermediate values for HL2, if possible.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-02-23 10:38:29 +00:00
parent 03caba99dc
commit 12969dbef6
1 changed files with 25 additions and 21 deletions
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46
Z80/Z80.cs
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@ -17,7 +17,7 @@ namespace EightBit
new Register16(), new Register16(), new Register16(),
},
{
new Register16(0), new Register16(0), new Register16(0),
new Register16(), new Register16(), new Register16(),
},
};
@ -1533,62 +1533,65 @@ namespace EightBit
private void SBC(Register16 value)
{
this.MEMPTR.Word = this.HL2().Word;
var hl2 = this.HL2();
this.MEMPTR.Word = hl2.Word;
var beforeNegative = this.MEMPTR.High & (byte)StatusBits.SF;
var valueNegative = value.High & (byte)StatusBits.SF;
var result = this.MEMPTR.Word - value.Word - (this.F & (byte)StatusBits.CF);
this.HL2().Word = (ushort)result;
hl2.Word = (ushort)result;
var afterNegative = this.HL2().High & (byte)StatusBits.SF;
var afterNegative = hl2.High & (byte)StatusBits.SF;
this.F = SetFlag(this.F, StatusBits.SF, afterNegative);
this.F = ClearFlag(this.F, StatusBits.ZF, this.HL2().Word);
this.F = AdjustHalfCarrySub(this.F, this.MEMPTR.High, value.High, this.HL2().High);
this.F = ClearFlag(this.F, StatusBits.ZF, hl2.Word);
this.F = AdjustHalfCarrySub(this.F, this.MEMPTR.High, value.High, hl2.High);
this.F = AdjustOverflowSub(this.F, beforeNegative, valueNegative, afterNegative);
this.F = SetFlag(this.F, StatusBits.NF);
this.F = SetFlag(this.F, StatusBits.CF, result & (int)Bits.Bit16);
this.F = AdjustXY(this.F, this.HL2().High);
this.F = AdjustXY(this.F, hl2.High);
++this.MEMPTR.Word;
}
private void ADC(Register16 value)
{
this.MEMPTR.Word = this.HL2().Word;
var hl2 = this.HL2();
this.MEMPTR.Word = hl2.Word;
var beforeNegative = this.MEMPTR.High & (byte)StatusBits.SF;
var valueNegative = value.High & (byte)StatusBits.SF;
var result = this.MEMPTR.Word + value.Word + (this.F & (byte)StatusBits.CF);
this.HL2().Word = (ushort)result;
hl2.Word = (ushort)result;
var afterNegative = this.HL2().High & (byte)StatusBits.SF;
var afterNegative = hl2.High & (byte)StatusBits.SF;
this.F = SetFlag(this.F, StatusBits.SF, afterNegative);
this.F = ClearFlag(this.F, StatusBits.ZF, this.HL2().Word);
this.F = AdjustHalfCarryAdd(this.F, this.MEMPTR.High, value.High, this.HL2().High);
this.F = ClearFlag(this.F, StatusBits.ZF, hl2.Word);
this.F = AdjustHalfCarryAdd(this.F, this.MEMPTR.High, value.High, hl2.High);
this.F = AdjustOverflowAdd(this.F, beforeNegative, valueNegative, afterNegative);
this.F = ClearFlag(this.F, StatusBits.NF);
this.F = SetFlag(this.F, StatusBits.CF, result & (int)Bits.Bit16);
this.F = AdjustXY(this.F, this.HL2().High);
this.F = AdjustXY(this.F, hl2.High);
++this.MEMPTR.Word;
}
private void Add(Register16 value)
{
this.MEMPTR.Word = this.HL2().Word;
var hl2 = this.HL2();
this.MEMPTR.Word = hl2.Word;
var result = this.MEMPTR.Word + value.Word;
this.HL2().Word = (ushort)result;
hl2.Word = (ushort)result;
this.F = ClearFlag(this.F, StatusBits.NF);
this.F = SetFlag(this.F, StatusBits.CF, result & (int)Bits.Bit16);
this.F = AdjustHalfCarryAdd(this.F, this.MEMPTR.High, value.High, this.HL2().High);
this.F = AdjustXY(this.F, this.HL2().High);
this.F = AdjustHalfCarryAdd(this.F, this.MEMPTR.High, value.High, hl2.High);
this.F = AdjustXY(this.F, hl2.High);
++this.MEMPTR.Word;
}
@ -1787,13 +1790,14 @@ namespace EightBit
private void XHTL()
{
var hl2 = this.HL2();
this.MEMPTR.Low = this.BusRead(this.SP);
this.BusWrite(this.HL2().Low);
this.HL2().Low = this.MEMPTR.Low;
this.BusWrite(hl2.Low);
hl2.Low = this.MEMPTR.Low;
++this.Bus.Address.Word;
this.MEMPTR.High = this.BusRead();
this.BusWrite(this.HL2().High);
this.HL2().High = this.MEMPTR.High;
this.BusWrite(hl2.High);
hl2.High = this.MEMPTR.High;
}
private void BlockCompare(Register16 source, Register16 counter)