unroll           1397 src/Func.cpp   Stage &Stage::unroll(VarOrRVar var) {
unroll           1427 src/Func.cpp   Stage &Stage::unroll(VarOrRVar var, Expr factor, TailStrategy tail) {
unroll           1912 src/Func.cpp   Func &Func::unroll(VarOrRVar var) {
unroll           1930 src/Func.cpp   Func &Func::unroll(VarOrRVar var, Expr factor, TailStrategy tail) {