LTS Termination Proof

by T2Cert

Input

Integer Transition System

Proof

1 Invariant Updates

The following invariants are asserted.

0: TRUE
1: 1 − arg1P ≤ 0 ∧ 1 − arg2P ≤ 0 ∧ 1 − arg1 ≤ 0 ∧ 1 − arg2 ≤ 0 ∧ − x7 ≤ 0
3: − x7 ≤ 0 ∧ 2 − x16 ≤ 0
4: 2 − arg1P ≤ 0 ∧ − arg3P ≤ 0 ∧ 2 − arg1 ≤ 0 ∧ − arg3 ≤ 0
5: 1 − arg1P ≤ 0 ∧ − arg2P ≤ 0 ∧ 1 − arg1 ≤ 0 ∧ − arg2 ≤ 0
6: TRUE

The invariants are proved as follows.

IMPACT Invariant Proof

2 Switch to Cooperation Termination Proof

We consider the following cutpoint-transitions:
3 14 3: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0
4 21 4: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0
5 28 5: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0
and for every transition t, a duplicate t is considered.

3 Transition Removal

We remove transitions 0, 2, 3, 10, 13 using the following ranking functions, which are bounded by −21.

6: 0
0: 0
1: 0
3: 0
4: 0
5: 0
6: −7
0: −8
1: −9
3: −10
3_var_snapshot: −10
3*: −10
4: −13
4_var_snapshot: −13
4*: −13
5: −16
5_var_snapshot: −16
5*: −16

4 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

3* 17 3: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0

5 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

3 15 3_var_snapshot: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0

6 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

4* 24 4: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0

7 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

4 22 4_var_snapshot: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0

8 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

5* 31 5: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0

9 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

5 29 5_var_snapshot: − x7 + x7 ≤ 0 ∧ x7 − x7 ≤ 0 ∧ − x64 + x64 ≤ 0 ∧ x64 − x64 ≤ 0 ∧ − x55 + x55 ≤ 0 ∧ x55 − x55 ≤ 0 ∧ − x46 + x46 ≤ 0 ∧ x46 − x46 ≤ 0 ∧ − x37 + x37 ≤ 0 ∧ x37 − x37 ≤ 0 ∧ − x16 + x16 ≤ 0 ∧ x16 − x16 ≤ 0 ∧ − arg6P + arg6P ≤ 0 ∧ arg6P − arg6P ≤ 0 ∧ − arg6 + arg6 ≤ 0 ∧ arg6 − arg6 ≤ 0 ∧ − arg5P + arg5P ≤ 0 ∧ arg5P − arg5P ≤ 0 ∧ − arg5 + arg5 ≤ 0 ∧ arg5 − arg5 ≤ 0 ∧ − arg4P + arg4P ≤ 0 ∧ arg4P − arg4P ≤ 0 ∧ − arg4 + arg4 ≤ 0 ∧ arg4 − arg4 ≤ 0 ∧ − arg3P + arg3P ≤ 0 ∧ arg3P − arg3P ≤ 0 ∧ − arg3 + arg3 ≤ 0 ∧ arg3 − arg3 ≤ 0 ∧ − arg2P + arg2P ≤ 0 ∧ arg2P − arg2P ≤ 0 ∧ − arg2 + arg2 ≤ 0 ∧ arg2 − arg2 ≤ 0 ∧ − arg1P + arg1P ≤ 0 ∧ arg1P − arg1P ≤ 0 ∧ − arg1 + arg1 ≤ 0 ∧ arg1 − arg1 ≤ 0

10 SCC Decomposition

We consider subproblems for each of the 3 SCC(s) of the program graph.

10.1 SCC Subproblem 1/3

Here we consider the SCC { 3, 3_var_snapshot, 3* }.

10.1.1 Transition Removal

We remove transitions 8, 9 using the following ranking functions, which are bounded by 5.

3: arg1 + arg2
3_var_snapshot: arg1 + arg2
3*: 2 + arg1 + arg2

10.1.2 Transition Removal

We remove transition 15 using the following ranking functions, which are bounded by −1.

3: 0
3_var_snapshot: −1
3*: 1

10.1.3 Transition Removal

We remove transition 17 using the following ranking functions, which are bounded by 1.

3: 0
3_var_snapshot: 0
3*: x16

10.1.4 Splitting Cut-Point Transitions

We consider 1 subproblems corresponding to sets of cut-point transitions as follows.

10.1.4.1 Cut-Point Subproblem 1/1

Here we consider cut-point transition 14.

10.1.4.1.1 Splitting Cut-Point Transitions

There remain no cut-point transition to consider. Hence the cooperation termination is trivial.

10.2 SCC Subproblem 2/3

Here we consider the SCC { 5, 5_var_snapshot, 5* }.

10.2.1 Transition Removal

We remove transitions 29, 31, 12 using the following ranking functions, which are bounded by 2.

5: 2 + 3⋅arg1
5_var_snapshot: 3⋅arg1
5*: 4 + 3⋅arg1

10.2.2 Transition Removal

We remove transition 11 using the following ranking functions, which are bounded by 2.

5: 0
5_var_snapshot: arg1
5*: 0

10.2.3 Splitting Cut-Point Transitions

We consider 1 subproblems corresponding to sets of cut-point transitions as follows.

10.2.3.1 Cut-Point Subproblem 1/1

Here we consider cut-point transition 28.

10.2.3.1.1 Splitting Cut-Point Transitions

There remain no cut-point transition to consider. Hence the cooperation termination is trivial.

10.3 SCC Subproblem 3/3

Here we consider the SCC { 4, 4_var_snapshot, 4* }.

10.3.1 Transition Removal

We remove transitions 4, 5, 6, 7 using the following ranking functions, which are bounded by 2.

4: 1 − 2⋅arg2 + 2⋅arg3 + arg4 − arg5
4_var_snapshot: −2⋅arg2 + 2⋅arg3 + arg4 − arg5
4*: 2 − 2⋅arg2 + 2⋅arg3 + arg4 − arg5

10.3.2 Transition Removal

We remove transitions 22, 24 using the following ranking functions, which are bounded by −1.

4: 0
4_var_snapshot: −1
4*: arg1P

10.3.3 Splitting Cut-Point Transitions

We consider 1 subproblems corresponding to sets of cut-point transitions as follows.

10.3.3.1 Cut-Point Subproblem 1/1

Here we consider cut-point transition 21.

10.3.3.1.1 Splitting Cut-Point Transitions

There remain no cut-point transition to consider. Hence the cooperation termination is trivial.

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