void SpecialFunctionHandler::handlePreferCex(ExecutionState &state,
KInstruction *target,
std::vector<ref<Expr> > &arguments) {
assert(arguments.size()==2 &&
"invalid number of arguments to klee_prefex_cex");
ref<Expr> cond = arguments[1];
if (cond->getWidth() != Expr::Bool)
cond = NeExpr::create(cond, ConstantExpr::alloc(0, cond->getWidth()));
Executor::ExactResolutionList rl;
executor.resolveExact(state, arguments[0], rl, "prefex_cex");
assert(rl.size() == 1 &&
"prefer_cex target must resolve to precisely one object");
rl[0].first.first->cexPreferences.push_back(cond);
}
