/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="inputWidth">bit-width of operand</param>
/// <param name="hiOffset">high slice offset</param>
/// <param name="loOffset">low slice offset</param>
/// <param name="signed">whether operand is signed</param>
public Slicer(int inputWidth, int hiOffset, int loOffset, bool signed)
{
Contract.Requires <ArgumentOutOfRangeException>(hiOffset - loOffset >= -1);
InputWidth = inputWidth;
HiOffset = hiOffset;
LoOffset = loOffset;
IsSigned = signed;
TASite = new SlicerTransactionSite(this);
int msb = signed ? inputWidth - 2 : inputWidth - 1;
int hiPadWidth = Math.Max(hiOffset, msb) - Math.Max(loOffset, msb + 1) + 1;
int loPadWidth = Math.Min(hiOffset, -1) - Math.Min(loOffset, 0) + 1;
_hiSlice = Math.Min(msb, hiOffset);
_loSlice = Math.Max(0, loOffset);
if (_loSlice > _hiSlice)
{
// degenerate case: actually no portion of input word is used
_hiSlice = -1;
_loSlice = 0;
}
_hiPad0 = StdLogicVector._0s(hiPadWidth);
_hiPad1 = StdLogicVector._1s(hiPadWidth);
_loPad = StdLogicVector._0s(loPadWidth);
Debug.Assert(hiPadWidth + loPadWidth + _hiSlice - _loSlice == hiOffset - loOffset);
}
/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="inputWidth">bit-width of operand</param>
/// <param name="hiOffset">high slice offset</param>
/// <param name="loOffset">low slice offset</param>
/// <param name="signed">whether operand is signed</param>
public Slicer(int inputWidth, int hiOffset, int loOffset, bool signed)
{
Contract.Requires<ArgumentOutOfRangeException>(hiOffset - loOffset >= -1);
InputWidth = inputWidth;
HiOffset = hiOffset;
LoOffset = loOffset;
IsSigned = signed;
TASite = new SlicerTransactionSite(this);
int msb = signed ? inputWidth - 2 : inputWidth - 1;
int hiPadWidth = Math.Max(hiOffset, msb) - Math.Max(loOffset, msb + 1) + 1;
int loPadWidth = Math.Min(hiOffset, -1) - Math.Min(loOffset, 0) + 1;
_hiSlice = Math.Min(msb, hiOffset);
_loSlice = Math.Max(0, loOffset);
if (_loSlice > _hiSlice)
{
// degenerate case: actually no portion of input word is used
_hiSlice = -1;
_loSlice = 0;
}
_hiPad0 = StdLogicVector._0s(hiPadWidth);
_hiPad1 = StdLogicVector._1s(hiPadWidth);
_loPad = StdLogicVector._0s(loPadWidth);
Debug.Assert(hiPadWidth + loPadWidth + _hiSlice - _loSlice == hiOffset - loOffset);
}
