public void nestedNegs(int depth)
{
var pair = GetVarAndIdExpr("foo", BasicType.GetBvType(8));
var variable = pair.Item1;
var id = pair.Item2;
var cfb = GetConstantFoldingBuilder();
Expr result = id;
for (int i = 0; i < depth; ++i)
{
result = cfb.BVNEG(result);
CheckIsBvType(result, 8);
}
if (depth % 2 == 0)
{
Assert.AreSame(id, result);
}
else
{
var asBvNeg = ExprUtil.AsBVNEG(result);
Assert.IsNotNull(asBvNeg);
Assert.AreSame(id, asBvNeg.Args[0]);
}
}
public void lhsIsZero()
{
var cfb = GetConstantFoldingBuilder();
var x = GetVarAndIdExpr("x", BasicType.GetBvType(8)).Item2;
var result = cfb.BVSUB(cfb.ConstantBV(0, 8), x);
CheckIsBvType(result, 8);
var asBvNeg = ExprUtil.AsBVNEG(result);
Assert.IsNotNull(asBvNeg);
Assert.AreSame(x, asBvNeg.Args[0]);
}
public void noFold()
{
var pair = GetSimpleAndConstantFoldingBuilder();
var sb = pair.Item1;
var cfb = pair.Item2;
var id = GetVarAndIdExpr("foo", BasicType.GetBvType(8)).Item2;
var foldedResult = cfb.BVNEG(id);
var simpleResult = sb.BVNEG(id);
CheckIsBvType(foldedResult, 8);
CheckIsBvType(simpleResult, 8);
Assert.AreEqual(simpleResult, foldedResult);
var asBvNeg = ExprUtil.AsBVNEG(foldedResult);
Assert.IsNotNull(asBvNeg);
Assert.AreSame(id, asBvNeg.Args[0]);
}