NO Initial ITS Start location: l3 0: l0 -> l1 : x^0'=x^post0, (1-x^0 <= 0 /\ x^0-x^post0 == 0), cost: 1 1: l1 -> l0 : x^0'=x^post1, 0 == 0, cost: 1 2: l1 -> l0 : x^0'=x^post2, 1-x^0+x^post2 == 0, cost: 1 3: l2 -> l0 : x^0'=x^post3, x^0-x^post3 == 0, cost: 1 4: l3 -> l2 : x^0'=x^post4, x^0-x^post4 == 0, cost: 1 Applied preprocessing Original rule: l0 -> l1 : x^0'=x^post0, (1-x^0 <= 0 /\ x^0-x^post0 == 0), cost: 1 New rule: l0 -> l1 : -1+x^0 >= 0, cost: 1 Applied preprocessing Original rule: l1 -> l0 : x^0'=x^post2, 1-x^0+x^post2 == 0, cost: 1 New rule: l1 -> l0 : x^0'=-1+x^0, TRUE, cost: 1 Applied preprocessing Original rule: l2 -> l0 : x^0'=x^post3, x^0-x^post3 == 0, cost: 1 New rule: l2 -> l0 : TRUE, cost: 1 Applied preprocessing Original rule: l3 -> l2 : x^0'=x^post4, x^0-x^post4 == 0, cost: 1 New rule: l3 -> l2 : TRUE, cost: 1 Simplified rules Start location: l3 5: l0 -> l1 : -1+x^0 >= 0, cost: 1 1: l1 -> l0 : x^0'=x^post1, 0 == 0, cost: 1 6: l1 -> l0 : x^0'=-1+x^0, TRUE, cost: 1 7: l2 -> l0 : TRUE, cost: 1 8: l3 -> l2 : TRUE, cost: 1 Eliminating location l2 by chaining: Applied chaining First rule: l3 -> l2 : TRUE, cost: 1 Second rule: l2 -> l0 : TRUE, cost: 1 New rule: l3 -> l0 : TRUE, cost: 2 Applied deletion Removed the following rules: 7 8 Eliminated locations on linear paths Start location: l3 5: l0 -> l1 : -1+x^0 >= 0, cost: 1 1: l1 -> l0 : x^0'=x^post1, 0 == 0, cost: 1 6: l1 -> l0 : x^0'=-1+x^0, TRUE, cost: 1 9: l3 -> l0 : TRUE, cost: 2 Eliminating location l1 by chaining: Applied chaining First rule: l0 -> l1 : -1+x^0 >= 0, cost: 1 Second rule: l1 -> l0 : x^0'=x^post1, 0 == 0, cost: 1 New rule: l0 -> l0 : x^0'=x^post1, (0 == 0 /\ -1+x^0 >= 0), cost: 2 Applied simplification Original rule: l0 -> l0 : x^0'=x^post1, (0 == 0 /\ -1+x^0 >= 0), cost: 2 New rule: l0 -> l0 : x^0'=x^post1, -1+x^0 >= 0, cost: 2 Applied chaining First rule: l0 -> l1 : -1+x^0 >= 0, cost: 1 Second rule: l1 -> l0 : x^0'=-1+x^0, TRUE, cost: 1 New rule: l0 -> l0 : x^0'=-1+x^0, -1+x^0 >= 0, cost: 2 Applied deletion Removed the following rules: 1 5 6 Eliminated locations on tree-shaped paths Start location: l3 10: l0 -> l0 : x^0'=x^post1, -1+x^0 >= 0, cost: 2 11: l0 -> l0 : x^0'=-1+x^0, -1+x^0 >= 0, cost: 2 9: l3 -> l0 : TRUE, cost: 2 Applied acceleration Original rule: l0 -> l0 : x^0'=x^post1, -1+x^0 >= 0, cost: 2 New rule: l0 -> l0 : x^0'=x^post1, (-1+n1 >= 0 /\ -1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 2*n1 Applied unrolling Original rule: l0 -> l0 : x^0'=x^post1, -1+x^0 >= 0, cost: 2 New rule: l0 -> l0 : x^0'=x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 4 Applied non-termination processor Original rule: l0 -> l0 : x^0'=x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 4 New rule: l0 -> [4] : (-1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: NONTERM Applied acceleration Original rule: l0 -> l0 : x^0'=-1+x^0, -1+x^0 >= 0, cost: 2 New rule: l0 -> l0 : x^0'=x^0-n3, (n3 >= 0 /\ x^0-n3 >= 0), cost: 2*n3 Applied instantiation Original rule: l0 -> l0 : x^0'=x^0-n3, (n3 >= 0 /\ x^0-n3 >= 0), cost: 2*n3 New rule: l0 -> l0 : x^0'=0, (0 >= 0 /\ x^0 >= 0), cost: 2*x^0 Applied chaining First rule: l0 -> l0 : x^0'=x^post1, -1+x^0 >= 0, cost: 2 Second rule: l0 -> l0 : x^0'=-1+x^0, -1+x^0 >= 0, cost: 2 New rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 4 Applied acceleration Original rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 4 New rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 4*n5 Applied chaining First rule: l0 -> l0 : x^0'=-1+x^0, -1+x^0 >= 0, cost: 2 Second rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 4*n5 New rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 2+4*n5 Applied chaining First rule: l0 -> l0 : x^0'=-1+x^0, -1+x^0 >= 0, cost: 2 Second rule: l0 -> l0 : x^0'=x^post1, -1+x^0 >= 0, cost: 2 New rule: l0 -> l0 : x^0'=x^post1, -2+x^0 >= 0, cost: 4 Applied acceleration Original rule: l0 -> l0 : x^0'=x^post1, -2+x^0 >= 0, cost: 4 New rule: l0 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 4*n7 Applied chaining First rule: l0 -> l0 : x^0'=x^post1, -1+x^0 >= 0, cost: 2 Second rule: l0 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 4*n7 New rule: l0 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -1+x^0 >= 0 /\ -2+x^post1 >= 0), cost: 2+4*n7 Applied simplification Original rule: l0 -> l0 : x^0'=0, (0 >= 0 /\ x^0 >= 0), cost: 2*x^0 New rule: l0 -> l0 : x^0'=0, x^0 >= 0, cost: 2*x^0 Applied simplification Original rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 4*n5 New rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 4*n5 Applied simplification Original rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+x^post1 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 2+4*n5 New rule: l0 -> l0 : x^0'=-1+x^post1, (-1+n5 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 2+4*n5 Applied deletion Removed the following rules: 10 11 Accelerated simple loops Start location: l3 12: l0 -> l0 : x^0'=x^post1, (-1+n1 >= 0 /\ -1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 2*n1 13: l0 -> [4] : (-1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: NONTERM 17: l0 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 4*n7 18: l0 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -1+x^0 >= 0 /\ -2+x^post1 >= 0), cost: 2+4*n7 19: l0 -> l0 : x^0'=0, x^0 >= 0, cost: 2*x^0 20: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 4*n5 21: l0 -> l0 : x^0'=-1+x^post1, (-1+n5 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 2+4*n5 9: l3 -> l0 : TRUE, cost: 2 Applied chaining First rule: l3 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=x^post1, (-1+n1 >= 0 /\ -1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 2*n1 New rule: l3 -> l0 : x^0'=x^post1, (-1+n1 >= 0 /\ -1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 2+2*n1 Applied chaining First rule: l3 -> l0 : TRUE, cost: 2 Second rule: l0 -> [4] : (-1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: NONTERM New rule: l3 -> [4] : -1+x^0 >= 0, cost: NONTERM Applied chaining First rule: l3 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 4*n7 New rule: l3 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 2+4*n7 Applied chaining First rule: l3 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -1+x^0 >= 0 /\ -2+x^post1 >= 0), cost: 2+4*n7 New rule: l3 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -1+x^0 >= 0 /\ -2+x^post1 >= 0), cost: 4+4*n7 Applied chaining First rule: l3 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=0, x^0 >= 0, cost: 2*x^0 New rule: l3 -> l0 : x^0'=0, x^0 >= 0, cost: 2+2*x^0 Applied chaining First rule: l3 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 4*n5 New rule: l3 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 2+4*n5 Applied chaining First rule: l3 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=-1+x^post1, (-1+n5 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 2+4*n5 New rule: l3 -> l0 : x^0'=-1+x^post1, (-1+n5 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 4+4*n5 Applied deletion Removed the following rules: 12 13 17 18 19 20 21 Chained accelerated rules with incoming rules Start location: l3 9: l3 -> l0 : TRUE, cost: 2 22: l3 -> l0 : x^0'=x^post1, (-1+n1 >= 0 /\ -1+x^0 >= 0 /\ -1+x^post1 >= 0), cost: 2+2*n1 23: l3 -> [4] : -1+x^0 >= 0, cost: NONTERM 24: l3 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 2+4*n7 25: l3 -> l0 : x^0'=x^post1, (-1+n7 >= 0 /\ -1+x^0 >= 0 /\ -2+x^post1 >= 0), cost: 4+4*n7 26: l3 -> l0 : x^0'=0, x^0 >= 0, cost: 2+2*x^0 27: l3 -> l0 : x^0'=-1+x^post1, (-1+x^0 >= 0 /\ -1+n5 >= 0 /\ -2+x^post1 >= 0), cost: 2+4*n5 28: l3 -> l0 : x^0'=-1+x^post1, (-1+n5 >= 0 /\ -2+x^post1 >= 0 /\ -2+x^0 >= 0), cost: 4+4*n5 Removed unreachable locations and irrelevant leafs Start location: l3 23: l3 -> [4] : -1+x^0 >= 0, cost: NONTERM Computing asymptotic complexity Proved nontermination of rule 23 via SMT. Proved the following lower bound Complexity: Nonterm Cpx degree: Nonterm Solved cost: NONTERM Rule cost: NONTERM Rule guard: -1+x^0 >= 0