private static CStatement ConditionCheck(Instruction i)
{
CStatement CtrCondition = null;
CStatement CrCondition = null;
if ((i.BO() & 4) == 0)
{
CtrCondition = new CStatement();
}
if ((i.BO() & 0x10) == 0)
{
CrCondition = new CStatement();
CrCondition.Kind = CStatement.Kinds.Comparison;
uint cr = i.BI() / 4;
uint fld = i.BI() % 4;
CrCondition.Op1 = new CStatement.COperand("cr" + cr);
CrCondition.Op2 = new CStatement.COperand(0);
bool bo = ((i.BO() >> 3) & 1) == 1;
switch (fld)
{
case 0:
if (bo)
CrCondition.ConditionSign = CStatement.Conditions.LessThan;
else
CrCondition.ConditionSign = CStatement.Conditions.GreaterEqualThan;
break;
case 1:
if (bo)
CrCondition.ConditionSign = CStatement.Conditions.GreaterThan;
else
CrCondition.ConditionSign = CStatement.Conditions.LessEqualThan;
break;
case 2:
if (bo)
CrCondition.ConditionSign = CStatement.Conditions.Equal;
else
CrCondition.ConditionSign = CStatement.Conditions.NotEqual;
break;
case 3:
if (bo)
CrCondition.ConditionSign = CStatement.Conditions.Overflow;
else
CrCondition.ConditionSign = CStatement.Conditions.NotOverflow;
break;
}
}
CStatement final = null;
if (CrCondition != null)
{
if (CtrCondition != null)
{
CStatement composite = new CStatement(CStatement.Kinds.CompositeCondition, CrCondition, CtrCondition);
composite.ConditionSign = CStatement.Conditions.And;
final = new CStatement();
final.Kind = CStatement.Kinds.Conditional;
final.Condition = composite;
}
else
{
final = new CStatement();
final.Kind = CStatement.Kinds.Conditional;
final.Condition = CrCondition;
}
}
else if (CtrCondition != null)
{
final = new CStatement();
final.Kind = CStatement.Kinds.Conditional;
final.Condition = CtrCondition;
}
return final;
}
