Initial Problem

Start: l0
Program_Vars: X₀, X₁, X₂, X₃
Temp_Vars:
Locations: l0, l1, l2, l3
Transitions:
t₀: l0(X₀, X₁, X₂, X₃) → l1(0, X₁, X₂, X₃)
t₁: l1(X₀, X₁, X₂, X₃) → l1(X₀+1, X₁-1, X₂, X₃) :|: 1 ≤ X₁
t₂: l1(X₀, X₁, X₂, X₃) → l2(X₀, X₁, X₀, X₃) :|: X₁ ≤ 0
t₃: l2(X₀, X₁, X₂, X₃) → l3(X₀, X₁, X₂, X₂) :|: 1 ≤ X₂
t₅: l3(X₀, X₁, X₂, X₃) → l2(X₀, X₁, X₂-1, X₃) :|: X₃ ≤ 0 ∧ 1 ≤ X₂
t₄: l3(X₀, X₁, X₂, X₃) → l3(X₀, X₁, X₂, X₃-1) :|: 1 ≤ X₃ ∧ 1 ≤ X₂

Preprocessing

Found invariant X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₁ ≤ X₂ ∧ 0 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ X₁ ≤ X₀ ∧ 0 ≤ X₀ for location l2

Found invariant 0 ≤ X₀ for location l1

Found invariant X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ for location l3

Problem after Preprocessing

Start: l0
Program_Vars: X₀, X₁, X₂, X₃
Temp_Vars:
Locations: l0, l1, l2, l3
Transitions:
t₀: l0(X₀, X₁, X₂, X₃) → l1(0, X₁, X₂, X₃)
t₁: l1(X₀, X₁, X₂, X₃) → l1(X₀+1, X₁-1, X₂, X₃) :|: 1 ≤ X₁ ∧ 0 ≤ X₀
t₂: l1(X₀, X₁, X₂, X₃) → l2(X₀, X₁, X₀, X₃) :|: X₁ ≤ 0 ∧ 0 ≤ X₀
t₃: l2(X₀, X₁, X₂, X₃) → l3(X₀, X₁, X₂, X₂) :|: 1 ≤ X₂ ∧ X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₁ ≤ X₂ ∧ 0 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ X₁ ≤ X₀ ∧ 0 ≤ X₀
t₅: l3(X₀, X₁, X₂, X₃) → l2(X₀, X₁, X₂-1, X₃) :|: X₃ ≤ 0 ∧ 1 ≤ X₂ ∧ X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀
t₄: l3(X₀, X₁, X₂, X₃) → l3(X₀, X₁, X₂, X₃-1) :|: 1 ≤ X₃ ∧ 1 ≤ X₂ ∧ X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀

MPRF for transition t₁: l1(X₀, X₁, X₂, X₃) → l1(X₀+1, X₁-1, X₂, X₃) :|: 1 ≤ X₁ ∧ 0 ≤ X₀ of depth 1:

new bound:

X₁ {O(n)}

MPRF:

l1 [X₁ ]

MPRF for transition t₃: l2(X₀, X₁, X₂, X₃) → l3(X₀, X₁, X₂, X₂) :|: 1 ≤ X₂ ∧ X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₁ ≤ X₂ ∧ 0 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ X₁ ≤ X₀ ∧ 0 ≤ X₀ of depth 1:

new bound:

X₁+1 {O(n)}

MPRF:

l3 [X₂ ]
l2 [X₂+1 ]

MPRF for transition t₅: l3(X₀, X₁, X₂, X₃) → l2(X₀, X₁, X₂-1, X₃) :|: X₃ ≤ 0 ∧ 1 ≤ X₂ ∧ X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ of depth 1:

new bound:

X₁ {O(n)}

MPRF:

l3 [X₂ ]
l2 [X₂ ]

Found invariant X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₁ ≤ X₂ ∧ 0 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ X₁ ≤ X₀ ∧ 0 ≤ X₀ for location l2

Found invariant 0 ≤ X₀ for location l1

Found invariant X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ for location l3

Time-Bound by TWN-Loops:

TWN-Loops: t₄ 4⋅X₁⋅X₁+9⋅X₁+5 {O(n^2)}

TWN-Loops:

entry: t₃: l2(X₀, X₁, X₂, X₃) → l3(X₀, X₁, X₂, X₂) :|: 1 ≤ X₂ ∧ X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₁ ≤ X₂ ∧ 0 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ X₁ ≤ X₀ ∧ 0 ≤ X₀
results in twn-loop: twn:Inv: [X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀] , (X₀,X₁,X₂,X₃) -> (X₀,X₁,X₂,X₃-1) :|: 1 ≤ X₃ ∧ 1 ≤ X₂
order: [X₀; X₁; X₂; X₃]
closed-form:
X₀: X₀
X₁: X₁
X₂: X₂
X₃: X₃ + [[n != 0]] * -1 * n^1

Termination: true
Formula:

1 < X₂ ∧ 1 < 0
∨ 1 < X₂ ∧ 1 < X₃ ∧ 1 ≤ 0 ∧ 0 ≤ 1
∨ 1 < X₂ ∧ 1 ≤ 0 ∧ 0 ≤ 1 ∧ 1 ≤ X₃ ∧ X₃ ≤ 1
∨ 1 ≤ X₂ ∧ X₂ ≤ 1 ∧ 1 < 0
∨ 1 ≤ X₂ ∧ X₂ ≤ 1 ∧ 1 < X₃ ∧ 1 ≤ 0 ∧ 0 ≤ 1
∨ 1 ≤ X₂ ∧ X₂ ≤ 1 ∧ 1 ≤ 0 ∧ 0 ≤ 1 ∧ 1 ≤ X₃ ∧ X₃ ≤ 1

Stabilization-Threshold for: 1 ≤ X₃
alphas_abs: X₃
M: 0
N: 1
Bound: 2⋅X₃+2 {O(n)}

relevant size-bounds w.r.t. t₃:
X₃: 2⋅X₁ {O(n)}
Runtime-bound of t₃: X₁+1 {O(n)}
Results in: 4⋅X₁⋅X₁+9⋅X₁+5 {O(n^2)}

4⋅X₁⋅X₁+9⋅X₁+5 {O(n^2)}

Analysing control-flow refined program

Cut unsatisfiable transition t₅: l3→l2

Found invariant X₂ ≤ X₀ ∧ 0 ≤ X₂ ∧ X₁ ≤ X₂ ∧ 0 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ X₁ ≤ X₀ ∧ 0 ≤ X₀ for location l2

Found invariant 0 ≤ X₀ for location l1

Found invariant 1+X₃ ≤ X₂ ∧ 1+X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ for location n_l3___1

Found invariant X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 1 ≤ X₃ ∧ 2 ≤ X₂+X₃ ∧ X₂ ≤ X₃ ∧ 1+X₁ ≤ X₃ ∧ 2 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ for location l3

knowledge_propagation leads to new time bound X₁+1 {O(n)} for transition t₅₄: l3(X₀, X₁, X₂, X₃) → n_l3___1(X₀, X₁, X₂, X₃-1) :|: X₁ ≤ 0 ∧ X₂ ≤ X₀ ∧ X₃ ≤ X₂ ∧ 1 ≤ X₃ ∧ X₂ ≤ X₃ ∧ X₃ ≤ X₂ ∧ 1 ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ 0 ∧ 1 ≤ X₃ ∧ X₃ ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ 0 ∧ 1 ≤ X₃ ∧ X₃ ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ 0 ∧ X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 1 ≤ X₃ ∧ 2 ≤ X₂+X₃ ∧ X₂ ≤ X₃ ∧ 1+X₁ ≤ X₃ ∧ 2 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀

MPRF for transition t₅₃: n_l3___1(X₀, X₁, X₂, X₃) → n_l3___1(X₀, X₁, X₂, X₃-1) :|: X₁ ≤ 0 ∧ X₂ ≤ X₀ ∧ X₃ ≤ X₂ ∧ 0 ≤ X₃ ∧ 1+X₃ ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ 0 ∧ 1 ≤ X₃ ∧ X₃ ≤ X₂ ∧ X₂ ≤ X₀ ∧ X₁ ≤ 0 ∧ 1+X₃ ≤ X₂ ∧ 1+X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ of depth 1:

new bound:

3⋅X₁⋅X₁+5⋅X₁+1 {O(n^2)}

MPRF:

l3 [X₃ ]
n_l3___1 [X₂+X₃+1 ]
l2 [X₂ ]

MPRF for transition t₅₇: n_l3___1(X₀, X₁, X₂, X₃) → l2(X₀, X₁, X₂-1, X₃) :|: X₃ ≤ 0 ∧ 1 ≤ X₂ ∧ X₃ ≤ X₂ ∧ X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ ∧ 1+X₃ ≤ X₂ ∧ 1+X₃ ≤ X₀ ∧ 0 ≤ X₃ ∧ 1 ≤ X₂+X₃ ∧ X₁ ≤ X₃ ∧ 1 ≤ X₀+X₃ ∧ X₂ ≤ X₀ ∧ 1 ≤ X₂ ∧ 1+X₁ ≤ X₂ ∧ 2 ≤ X₀+X₂ ∧ X₁ ≤ 0 ∧ 1+X₁ ≤ X₀ ∧ 1 ≤ X₀ of depth 1:

new bound:

X₁ {O(n)}

MPRF:

l3 [X₃ ]
n_l3___1 [X₂ ]
l2 [X₂ ]

CFR did not improve the program. Rolling back

All Bounds

Timebounds

Overall timebound:4⋅X₁⋅X₁+12⋅X₁+8 {O(n^2)}
t₀: 1 {O(1)}
t₁: X₁ {O(n)}
t₂: 1 {O(1)}
t₃: X₁+1 {O(n)}
t₄: 4⋅X₁⋅X₁+9⋅X₁+5 {O(n^2)}
t₅: X₁ {O(n)}

Costbounds

Overall costbound: 4⋅X₁⋅X₁+12⋅X₁+8 {O(n^2)}
t₀: 1 {O(1)}
t₁: X₁ {O(n)}
t₂: 1 {O(1)}
t₃: X₁+1 {O(n)}
t₄: 4⋅X₁⋅X₁+9⋅X₁+5 {O(n^2)}
t₅: X₁ {O(n)}

Sizebounds

t₀, X₀: 0 {O(1)}
t₀, X₁: X₁ {O(n)}
t₀, X₂: X₂ {O(n)}
t₀, X₃: X₃ {O(n)}
t₁, X₀: X₁ {O(n)}
t₁, X₁: X₁ {O(n)}
t₁, X₂: X₂ {O(n)}
t₁, X₃: X₃ {O(n)}
t₂, X₀: X₁ {O(n)}
t₂, X₁: 2⋅X₁ {O(n)}
t₂, X₂: X₁ {O(n)}
t₂, X₃: 2⋅X₃ {O(n)}
t₃, X₀: X₁ {O(n)}
t₃, X₁: 2⋅X₁ {O(n)}
t₃, X₂: X₁ {O(n)}
t₃, X₃: 2⋅X₁ {O(n)}
t₄, X₀: X₁ {O(n)}
t₄, X₁: 2⋅X₁ {O(n)}
t₄, X₂: X₁ {O(n)}
t₄, X₃: 2⋅X₁ {O(n)}
t₅, X₀: X₁ {O(n)}
t₅, X₁: 2⋅X₁ {O(n)}
t₅, X₂: X₁ {O(n)}
t₅, X₃: 0 {O(1)}