NO Initial ITS Start location: l4 0: l0 -> l1 : pre_v^0'=pre_v^post0, v_next^0'=v_next^post0, v^0'=v^post0, (pre_v^0-pre_v^post0 == 0 /\ 1-v_next^0+v^0 <= 0 /\ v_next^0-v_next^post0 == 0 /\ -v^post0+v^0 == 0), cost: 1 1: l0 -> l2 : pre_v^0'=pre_v^post1, v_next^0'=v_next^post1, v^0'=v^post1, (v_next^0-v_next^post1 == 0 /\ pre_v^0-pre_v^post1 == 0 /\ v^0-v^post1 == 0), cost: 1 2: l2 -> l0 : pre_v^0'=pre_v^post2, v_next^0'=v_next^post2, v^0'=v^post2, (0 == 0 /\ -1+v^post2-v^10 == 0 /\ -v_next^post2+v^10 == 0 /\ pre_v^post2-v^0 == 0), cost: 1 3: l3 -> l2 : pre_v^0'=pre_v^post3, v_next^0'=v_next^post3, v^0'=v^post3, (v_next^0-v_next^post3 == 0 /\ v^0-v^post3 == 0 /\ pre_v^0-pre_v^post3 == 0), cost: 1 4: l4 -> l3 : pre_v^0'=pre_v^post4, v_next^0'=v_next^post4, v^0'=v^post4, (pre_v^0-pre_v^post4 == 0 /\ v_next^0-v_next^post4 == 0 /\ v^0-v^post4 == 0), cost: 1 Removed unreachable rules and leafs Start location: l4 1: l0 -> l2 : pre_v^0'=pre_v^post1, v_next^0'=v_next^post1, v^0'=v^post1, (v_next^0-v_next^post1 == 0 /\ pre_v^0-pre_v^post1 == 0 /\ v^0-v^post1 == 0), cost: 1 2: l2 -> l0 : pre_v^0'=pre_v^post2, v_next^0'=v_next^post2, v^0'=v^post2, (0 == 0 /\ -1+v^post2-v^10 == 0 /\ -v_next^post2+v^10 == 0 /\ pre_v^post2-v^0 == 0), cost: 1 3: l3 -> l2 : pre_v^0'=pre_v^post3, v_next^0'=v_next^post3, v^0'=v^post3, (v_next^0-v_next^post3 == 0 /\ v^0-v^post3 == 0 /\ pre_v^0-pre_v^post3 == 0), cost: 1 4: l4 -> l3 : pre_v^0'=pre_v^post4, v_next^0'=v_next^post4, v^0'=v^post4, (pre_v^0-pre_v^post4 == 0 /\ v_next^0-v_next^post4 == 0 /\ v^0-v^post4 == 0), cost: 1 Applied preprocessing Original rule: l0 -> l2 : pre_v^0'=pre_v^post1, v_next^0'=v_next^post1, v^0'=v^post1, (v_next^0-v_next^post1 == 0 /\ pre_v^0-pre_v^post1 == 0 /\ v^0-v^post1 == 0), cost: 1 New rule: l0 -> l2 : TRUE, cost: 1 Applied preprocessing Original rule: l2 -> l0 : pre_v^0'=pre_v^post2, v_next^0'=v_next^post2, v^0'=v^post2, (0 == 0 /\ -1+v^post2-v^10 == 0 /\ -v_next^post2+v^10 == 0 /\ pre_v^post2-v^0 == 0), cost: 1 New rule: l2 -> l0 : pre_v^0'=v^0, v_next^0'=v^10, v^0'=1+v^10, 0 == 0, cost: 1 Applied preprocessing Original rule: l3 -> l2 : pre_v^0'=pre_v^post3, v_next^0'=v_next^post3, v^0'=v^post3, (v_next^0-v_next^post3 == 0 /\ v^0-v^post3 == 0 /\ pre_v^0-pre_v^post3 == 0), cost: 1 New rule: l3 -> l2 : TRUE, cost: 1 Applied preprocessing Original rule: l4 -> l3 : pre_v^0'=pre_v^post4, v_next^0'=v_next^post4, v^0'=v^post4, (pre_v^0-pre_v^post4 == 0 /\ v_next^0-v_next^post4 == 0 /\ v^0-v^post4 == 0), cost: 1 New rule: l4 -> l3 : TRUE, cost: 1 Simplified rules Start location: l4 5: l0 -> l2 : TRUE, cost: 1 6: l2 -> l0 : pre_v^0'=v^0, v_next^0'=v^10, v^0'=1+v^10, 0 == 0, cost: 1 7: l3 -> l2 : TRUE, cost: 1 8: l4 -> l3 : TRUE, cost: 1 Eliminating location l3 by chaining: Applied chaining First rule: l4 -> l3 : TRUE, cost: 1 Second rule: l3 -> l2 : TRUE, cost: 1 New rule: l4 -> l2 : TRUE, cost: 2 Applied deletion Removed the following rules: 7 8 Eliminating location l0 by chaining: Applied chaining First rule: l2 -> l0 : pre_v^0'=v^0, v_next^0'=v^10, v^0'=1+v^10, 0 == 0, cost: 1 Second rule: l0 -> l2 : TRUE, cost: 1 New rule: l2 -> l2 : pre_v^0'=v^0, v_next^0'=v^10, v^0'=1+v^10, 0 == 0, cost: 2 Applied deletion Removed the following rules: 5 6 Eliminated locations on linear paths Start location: l4 10: l2 -> l2 : pre_v^0'=v^0, v_next^0'=v^10, v^0'=1+v^10, 0 == 0, cost: 2 9: l4 -> l2 : TRUE, cost: 2 Applied nonterm Original rule: l2 -> l2 : pre_v^0'=v^0, v_next^0'=v^10, v^0'=1+v^10, 0 == 0, cost: 2 New rule: l2 -> [5] : 0 >= 0, cost: NONTERM Applied acceleration Original rule: l2 -> l2 : pre_v^0'=v^0, v_next^0'=v^10, v^0'=1+v^10, 0 == 0, cost: 2 New rule: l2 -> l2 : pre_v^0'=1+v^10, v_next^0'=v^10, v^0'=1+v^10, 0 >= 0, cost: 2*n0 Applied deletion Removed the following rules: 10 Accelerated simple loops Start location: l4 11: l2 -> [5] : 0 >= 0, cost: NONTERM 12: l2 -> l2 : pre_v^0'=1+v^10, v_next^0'=v^10, v^0'=1+v^10, 0 >= 0, cost: 2*n0 9: l4 -> l2 : TRUE, cost: 2 Applied chaining First rule: l4 -> l2 : TRUE, cost: 2 Second rule: l2 -> [5] : 0 >= 0, cost: NONTERM New rule: l4 -> [5] : 0 >= 0, cost: NONTERM Applied chaining First rule: l4 -> l2 : TRUE, cost: 2 Second rule: l2 -> l2 : pre_v^0'=1+v^10, v_next^0'=v^10, v^0'=1+v^10, 0 >= 0, cost: 2*n0 New rule: l4 -> l2 : pre_v^0'=1+v^10, v_next^0'=v^10, v^0'=1+v^10, 0 >= 0, cost: 2+2*n0 Applied deletion Removed the following rules: 11 12 Chained accelerated rules with incoming rules Start location: l4 9: l4 -> l2 : TRUE, cost: 2 13: l4 -> [5] : 0 >= 0, cost: NONTERM 14: l4 -> l2 : pre_v^0'=1+v^10, v_next^0'=v^10, v^0'=1+v^10, 0 >= 0, cost: 2+2*n0 Removed unreachable locations and irrelevant leafs Start location: l4 13: l4 -> [5] : 0 >= 0, cost: NONTERM Computing asymptotic complexity Proved nontermination of rule 13 via SMT. Proved the following lower bound Complexity: Nonterm Cpx degree: Nonterm Solved cost: NONTERM Rule cost: NONTERM Rule guard: 0 >= 0