public ALUTestDesign(int awidth, int bwidth, int pipelineDepth)
{
_clk = new SLSignal();
_a = new SLVSignal(awidth) { InitialValue = StdLogicVector._0s(awidth) };
_b = new SLVSignal(bwidth) { InitialValue = StdLogicVector._0s(bwidth) };
_ba = new SLVSignal(awidth) { InitialValue = StdLogicVector._0s(awidth) };
_clkGen = new Clock(new Time(10.0, ETimeUnit.ns));
Bind(() => _clkGen.Clk = _clk);
_add = new ALU(ALU.EFunction.Add, ALU.EArithMode.Signed, pipelineDepth,
awidth, bwidth, Math.Max(awidth, bwidth) + 1);
Bind(() =>
{
_add.Clk = _clk;
_add.A = _a;
_add.B = _b;
_add.R = _rAdd;
});
_rAdd = new SLVSignal(_add.RWidth);
_sub = new ALU(ALU.EFunction.Sub, ALU.EArithMode.Signed, pipelineDepth,
awidth, bwidth, Math.Max(awidth, bwidth) + 1);
Bind(() =>
{
_sub.Clk = _clk;
_sub.A = _a;
_sub.B = _b;
_sub.R = _rSub;
});
_rSub = new SLVSignal(_sub.RWidth);
_mul = new ALU(ALU.EFunction.Mul, ALU.EArithMode.Signed, pipelineDepth,
awidth, bwidth, awidth + bwidth);
Bind(() =>
{
_mul.Clk = _clk;
_mul.A = _a;
_mul.B = _b;
_mul.R = _rMul;
});
_rMul = new SLVSignal(_mul.RWidth);
_neg = new ALU(ALU.EFunction.Neg, ALU.EArithMode.Signed, pipelineDepth,
awidth, 0, awidth + 1);
Bind(() =>
{
_neg.Clk = _clk;
_neg.A = _a;
_neg.R = _rNeg;
});
_rNeg = new SLVSignal(_neg.RWidth);
_not = new ALU(ALU.EFunction.Not, ALU.EArithMode.Signed, pipelineDepth,
awidth, 0, awidth);
Bind(() =>
{
_not.Clk = _clk;
_not.A = _a;
_not.R = _rNot;
});
_rNot = new SLVSignal(_not.RWidth);
_and = new ALU(ALU.EFunction.And, ALU.EArithMode.Signed, pipelineDepth,
awidth, awidth, awidth);
Bind(() =>
{
_and.Clk = _clk;
_and.A = _a;
_and.B = _ba;
_and.R = _rAnd;
});
_rAnd = new SLVSignal(_and.RWidth);
_or = new ALU(ALU.EFunction.Or, ALU.EArithMode.Signed, pipelineDepth,
awidth, awidth, awidth);
Bind(() =>
{
_or.Clk = _clk;
_or.A = _a;
_or.B = _ba;
_or.R = _rOr;
});
_rOr = new SLVSignal(_or.RWidth);
}
public IXILMapping TryAllocate(Component host, XILInstr instr, TypeDescriptor[] operandTypes, TypeDescriptor[] resultTypes, IProject proj)
{
if (!CheckFixCompliance(instr, operandTypes, resultTypes))
return null;
bool isArith = false;
int osize0, osize1 = 0;
int rsize;
ALU.EArithMode amode;
ALU.EFunction op;
switch (instr.Name)
{
case InstructionCodes.Add:
case InstructionCodes.Sub:
case InstructionCodes.Mul:
isArith = true;
goto case InstructionCodes.IsLt;
case InstructionCodes.IsLt:
case InstructionCodes.IsLte:
case InstructionCodes.IsEq:
case InstructionCodes.IsNEq:
case InstructionCodes.IsGte:
case InstructionCodes.IsGt:
{
if (operandTypes.All(t => t.CILType.Equals(typeof(Signed))) &&
(!isArith || resultTypes[0].CILType.Equals(typeof(Signed))) &&
(isArith || resultTypes[0].CILType.Equals(typeof(bool)) ||
resultTypes[0].CILType.Equals(typeof(StdLogicVector))))
amode = ALU.EArithMode.Signed;
else if (operandTypes.All(t => t.CILType.Equals(typeof(SFix))) &&
(!isArith || resultTypes[0].CILType.Equals(typeof(SFix))) &&
(isArith || resultTypes[0].CILType.Equals(typeof(bool)) ||
resultTypes[0].CILType.Equals(typeof(StdLogicVector))))
amode = ALU.EArithMode.Signed;
else if (operandTypes.All(t => t.CILType.Equals(typeof(Unsigned))) &&
(!isArith || resultTypes[0].CILType.Equals(typeof(Unsigned))) &&
(isArith || resultTypes[0].CILType.Equals(typeof(bool)) ||
resultTypes[0].CILType.Equals(typeof(StdLogicVector))))
amode = ALU.EArithMode.Unsigned;
else if (operandTypes.All(t => t.CILType.Equals(typeof(UFix))) &&
(!isArith || resultTypes[0].CILType.Equals(typeof(UFix))) &&
(isArith || resultTypes[0].CILType.Equals(typeof(bool)) ||
resultTypes[0].CILType.Equals(typeof(StdLogicVector))))
amode = ALU.EArithMode.Unsigned;
else if (operandTypes.All(t => t.CILType.Equals(typeof(StdLogicVector))) &&
resultTypes[0].CILType.Equals(typeof(StdLogicVector)))
amode = ALU.EArithMode.Unsigned;
else if (operandTypes.All(t => t.CILType.Equals(typeof(StdLogic))) &&
resultTypes[0].CILType.Equals(typeof(StdLogicVector)) &&
(instr.Name == InstructionCodes.IsEq ||
instr.Name == InstructionCodes.IsNEq))
amode = ALU.EArithMode.Unsigned;
else
return null;
osize0 = TypeLowering.Instance.GetWireWidth(operandTypes[0]);
osize1 = TypeLowering.Instance.GetWireWidth(operandTypes[1]);
rsize = TypeLowering.Instance.GetWireWidth(resultTypes[0]); ;
switch (instr.Name)
{
case InstructionCodes.Add:
op = ALU.EFunction.Add;
break;
case InstructionCodes.Sub:
op = ALU.EFunction.Sub;
break;
case InstructionCodes.Mul:
op = ALU.EFunction.Mul;
break;
case InstructionCodes.IsLt:
case InstructionCodes.IsLte:
case InstructionCodes.IsEq:
case InstructionCodes.IsNEq:
case InstructionCodes.IsGte:
case InstructionCodes.IsGt:
op = ALU.EFunction.Compare;
break;
default:
throw new InvalidOperationException();
}
}
break;
case InstructionCodes.Neg:
{
if (operandTypes[0].CILType.Equals(typeof(Signed)) &&
resultTypes[0].CILType.Equals(typeof(Signed)))
amode = ALU.EArithMode.Signed;
else if (operandTypes[0].CILType.Equals(typeof(SFix)) &&
resultTypes[0].CILType.Equals(typeof(SFix)))
amode = ALU.EArithMode.Signed;
else if (operandTypes[0].CILType.Equals(typeof(Unsigned)) &&
resultTypes[0].CILType.Equals(typeof(Unsigned)))
amode = ALU.EArithMode.Unsigned;
else if (operandTypes[0].CILType.Equals(typeof(UFix)) &&
resultTypes[0].CILType.Equals(typeof(UFix)))
amode = ALU.EArithMode.Unsigned;
else
return null;
osize0 = TypeLowering.Instance.GetWireWidth(operandTypes[0]);
rsize = TypeLowering.Instance.GetWireWidth(resultTypes[0]);
//alu = new ALU(ALU.EFunction.Neg, amode, 1, osize, 0, rsize);
op = ALU.EFunction.Neg;
}
break;
case InstructionCodes.And:
case InstructionCodes.Or:
{
if (operandTypes.Length != 2 ||
resultTypes.Length != 1)
return null;
if (!((operandTypes[0].CILType.Equals(typeof(StdLogicVector)) &&
operandTypes[1].CILType.Equals(typeof(StdLogicVector)) &&
resultTypes[0].CILType.Equals(typeof(StdLogicVector))) ||
(operandTypes[0].CILType.Equals(typeof(Unsigned)) &&
operandTypes[1].CILType.Equals(typeof(Unsigned)) &&
resultTypes[0].CILType.Equals(typeof(Unsigned)))))
return null;
osize0 = TypeLowering.Instance.GetWireWidth(operandTypes[0]);
osize1 = TypeLowering.Instance.GetWireWidth(operandTypes[1]);
rsize = TypeLowering.Instance.GetWireWidth(resultTypes[0]);
amode = ALU.EArithMode.Signed;
switch (instr.Name)
{
case InstructionCodes.And:
//alu = new ALU(ALU.EFunction.And, ALU.EArithMode.Signed, 0, osize0, osize1, rsize);
op = ALU.EFunction.And;
break;
case InstructionCodes.Or:
//alu = new ALU(ALU.EFunction.Or, ALU.EArithMode.Signed, 0, osize0, osize1, rsize);
op = ALU.EFunction.Or;
break;
default:
throw new NotImplementedException();
}
}
break;
case InstructionCodes.Not:
{
if (operandTypes.Length != 1 ||
resultTypes.Length != 1)
return null;
if (!((operandTypes[0].CILType.Equals(typeof(StdLogicVector)) &&
resultTypes[0].CILType.Equals(typeof(StdLogicVector)))))
return null;
osize0 = TypeLowering.Instance.GetWireWidth(operandTypes[0]);
rsize = TypeLowering.Instance.GetWireWidth(resultTypes[0]);
//alu = new ALU(ALU.EFunction.Not, ALU.EArithMode.Unsigned, 0, osize, 0, rsize);
amode = ALU.EArithMode.Unsigned;
op = ALU.EFunction.Not;
}
break;
default:
return null;
}
int pdepth = CalcPipelineDepth(op, amode, osize0, osize1, rsize);
ALU alu = new ALU(op, amode, pdepth, osize0, osize1, rsize);
return TryMapOne(alu.Transactor, instr, operandTypes, resultTypes, false);
}
private int DefaultCalcPipelineDepth(ALU.EFunction op, ALU.EArithMode mode, int osize0, int osize1, int rsize)
{
switch (op)
{
case ALU.EFunction.And:
case ALU.EFunction.Not:
case ALU.EFunction.Or:
return 0;
case ALU.EFunction.Add:
case ALU.EFunction.Compare:
case ALU.EFunction.Neg:
case ALU.EFunction.Sub:
return 1;
case ALU.EFunction.Mul:
return 2;
default:
throw new NotImplementedException();
}
}
public ALUTransactor(ALU host):
base(host)
{
_host = host;
}
public int CalcALUPipelineDepth(ALU.EFunction op, ALU.EArithMode mode, int osize0, int osize1, int rsize)
{
switch (op)
{
case ALU.EFunction.Add:
case ALU.EFunction.Compare:
case ALU.EFunction.Sub:
{
float max = (float)osize0 * 0.0625f;
int depth = (int)Math.Round(_ratio * max);
return depth;
}
case ALU.EFunction.And:
case ALU.EFunction.Not:
case ALU.EFunction.Or:
return 0;
case ALU.EFunction.Mul:
{
float min = 0.0f;
// These coefficients were found experimentally by
// regression of Xilinx datasheet
float qterm = 0.0049f * (float)osize0 * (float)osize1;
float linterm = 0.0857f * (float)(osize0 + osize1);
float max = 0.5f * qterm + 0.4f * linterm + 1.0f;
int depth = (int)Math.Round(min + _ratio * (max - min));
return depth;
}
case ALU.EFunction.Neg:
{
float max = osize0 / 16.0f;
int depth = (int)Math.Ceiling(_ratio * max);
return depth;
}
default:
throw new NotImplementedException();
}
}
