private void Emit(XILInstr xili, object backRef, InstructionDependency[] preds, int numOperands, params TypeDescriptor[] resultTypes)
{
Contract.Requires(xili != null && preds != null && numOperands >= 0 &&
resultTypes != null && resultTypes.All(t => t != null));
xili.BackRef = backRef;
TypeDescriptor[] operandTypes = new TypeDescriptor[numOperands];
for (int i = numOperands - 1; i >= 0; i--)
{
operandTypes[i] = _typeStack.Pop();
}
for (int i = 0; i < resultTypes.Length; i++)
{
_typeStack.Push(resultTypes[i]);
}
Emit(xili.CreateStk(preds, operandTypes, resultTypes));
}
/// <summary>
/// Tries to map the given XIL instruction to any suitable functional unit. This call will not create any actual hardware. It is used by the
/// scheduler to query basic instruction metrics, namely initiation interval and latency.
/// </summary>
/// <param name="instr">XIL instruction</param>
/// <param name="operandTypes">operand types of XIL instruction</param>
/// <param name="resultTypes">result types of XIL instruction</param>
/// <param name="binder">binder service</param>
/// <returns>a hardware mapping for the supplied instruction or null if no such exists</returns>
public IXILMapping TryMap(XILInstr instr, TypeDescriptor[] operandTypes, TypeDescriptor[] resultTypes, IAutoBinder binder)
{
var xilsi = instr.CreateStk(new InstructionDependency[0], operandTypes, resultTypes);
IXILMapping mapping;
if (_xilMappings.TryGetValue(xilsi, out mapping))
{
return(mapping);
}
IEnumerable <IXILMapper> mappers = _xmm.LookupMappers(instr);
foreach (IXILMapper mapper in mappers)
{
var tas = _taMapLookup.Get(mapper);
foreach (var ta in tas)
{
var mappings = mapper.TryMap(ta, instr, operandTypes, resultTypes);
if (mappings.Any())
{
mapping = mappings.First();
_xilMappings[xilsi] = mapping;
return(mapping);
}
}
}
foreach (IXILMapper mapper in mappers)
{
mapping = mapper.TryAllocate(_host, instr, operandTypes, resultTypes, _targetProject);
if (mapping != null)
{
_taMapLookup.Add(mapper, mapping.TASite);
_xilMappings[xilsi] = mapping;
return(mapping);
}
}
return(null);
}