Writable lhs = stmt.getLeftHandSide();
RTLExpression xprime = ExpressionFactory.createVariable("xprime" + lhs.getBitWidth(), lhs.getBitWidth());
Context subCtx = new Context();
subCtx.substitute(lhs, xprime);
Solver solver = Solver.createSolver();
RTLExpression stateFormula = s.getStateFormula(prec);
solver.addAssertion(stateFormula);
solver.addAssertion(ExpressionFactory.createEqual(xprime,