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Improve performance of ADC_d (decimal)

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This commit is contained in:
Adrian Conlon 2024-05-28 16:15:35 +01:00
parent 243cd9e969
commit 07ed273688
1 changed files with 7 additions and 7 deletions
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14
M6502/M6502.cs
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@ -1020,16 +1020,16 @@ namespace EightBit
var operand = this.A;
var data = this.Bus.Data;
Register16 low = new(LowerNibble(operand) + LowerNibble(data) + this.Carry);
intermediate.Word = (ushort)(HigherNibble(operand) + HigherNibble(data));
var low = (ushort)(LowerNibble(operand) + LowerNibble(data) + this.Carry);
this.intermediate.Word = (ushort)(HigherNibble(operand) + HigherNibble(data));
AdjustZero(new Register16(low.Word + this.intermediate.Word).Low);
this.AdjustZero(LowByte((ushort)(low + this.intermediate.Word)));
if (low.Word > 0x09)
if (low > 0x09)
{
this.intermediate.Word += 0x10;
low.Word += 0x06;
}
low += 0x06;
}
this.AdjustNegative(this.intermediate.Low);
this.AdjustOverflow_add(operand);
@ -1039,7 +1039,7 @@ namespace EightBit
this.SetFlag(StatusBits.CF, this.intermediate.High);
this.A = (byte)(LowerNibble(low.Low) | HigherNibble(this.intermediate.Low));
this.A = (byte)(LowerNibble(LowByte(low)) | HigherNibble(this.intermediate.Low));
}
// Undocumented compound instructions (with BCD effects)