public void AsBVZEXTNotWithoutBVZEXT()
{
var sb = GetSimpleBuilder();
var v = GetVarAndIdExpr("foo", BasicType.GetBvType(4)).Item2;
var zext = sb.BVADD(v, v);
var asBvZExt = ExprUtil.AsBVZEXT(zext);
Assert.IsNull(asBvZExt);
}
public void MSBIsZero()
{
var cfb = GetConstantFoldingBuilder();
var msb = cfb.ConstantBV(0, 8);
var lsb = GetVarAndIdExpr("x", BasicType.GetBvType(4)).Item2;
var result = cfb.BVCONCAT(msb, lsb);
var asBvZExt = ExprUtil.AsBVZEXT(result);
Assert.IsNotNull(asBvZExt);
CheckIsBvType(result, 12);
Assert.AreSame(lsb, asBvZExt.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.BVZEXT(id, 16);
var simpleResult = sb.BVZEXT(id, 16);
CheckIsBvType(foldedResult, 16);
CheckIsBvType(simpleResult, 16);
Assert.AreEqual(simpleResult, foldedResult);
var asBvZExt = ExprUtil.AsBVZEXT(foldedResult);
Assert.IsNotNull(asBvZExt);
Assert.AreSame(id, asBvZExt.Args[0]);
}
public void nestedBVZEXT(int depth)
{
var pair = GetVarAndIdExpr("foo", BasicType.GetBvType(4));
var variable = pair.Item1;
var id = pair.Item2;
var cfb = GetConstantFoldingBuilder();
Expr result = cfb.BVZEXT(id, 8);
Assert.IsNotNull(ExprUtil.AsBVZEXT(result));
for (int i = 0; i < depth; ++i)
{
// The newest (closest to the root) zero_extend superseeds any below
result = cfb.BVZEXT(result, 8 + i);
CheckIsBvType(result, 8 + i);
}
CheckIsBvType(result, depth + 8 - 1);
var asBvZext = ExprUtil.AsBVZEXT(result);
Assert.IsNotNull(asBvZext);
Assert.AreSame(id, asBvZext.Args[0]);
}