is_undef           61 src/IROperator.h EXPORT bool is_undef(const Expr &e);
is_undef         4835 src/Simplify.cpp         } else if (is_undef(value) || (load && load->name == op->name && equal(load->index, index))) {
is_undef          174 src/SplitTuples.cpp             if (!is_undef(val) && atomic) {