Initial Problem
Start: l0
Program_Vars: X₀, X₁
Temp_Vars:
Locations: l0, l1, l2, l3, l4, l5
Transitions:
t₀: l0(X₀, X₁) → l2(X₀, X₁)
t₂: l1(X₀, X₁) → l3(X₀, X₁) :|: X₀ < 100
t₃: l1(X₀, X₁) → l4(X₀, X₁) :|: 100 ≤ X₀
t₁: l2(X₀, X₁) → l1(0, X₁)
t₄: l3(X₀, X₁) → l1(X₀+1, X₁) :|: X₀ < 50
t₅: l3(X₀, X₁) → l1(X₀-1, X₁) :|: 50 ≤ X₀
t₆: l4(X₀, X₁) → l5(X₀, X₁)
Preprocessing
Eliminate variables {X₁} that do not contribute to the problem
Found invariant 100 ≤ X₀ for location l5
Found invariant 0 ≤ X₀ for location l1
Found invariant 100 ≤ X₀ for location l4
Found invariant X₀ ≤ 99 ∧ 0 ≤ X₀ for location l3
Cut unsatisfiable transition t₁₅: l1→l4
Cut unreachable locations [l4; l5] from the program graph
Problem after Preprocessing
Start: l0
Program_Vars: X₀
Temp_Vars:
Locations: l0, l1, l2, l3
Transitions:
t₁₃: l0(X₀) → l2(X₀)
t₁₄: l1(X₀) → l3(X₀) :|: X₀ < 100 ∧ 0 ≤ X₀
t₁₆: l2(X₀) → l1(0)
t₁₇: l3(X₀) → l1(X₀+1) :|: X₀ < 50 ∧ X₀ ≤ 99 ∧ 0 ≤ X₀
t₁₈: l3(X₀) → l1(X₀-1) :|: 50 ≤ X₀ ∧ X₀ ≤ 99 ∧ 0 ≤ X₀
Chain transitions t₁₈: l3→l1 and t₁₄: l1→l3 to t₅₅: l3→l3
Chain transitions t₁₇: l3→l1 and t₁₄: l1→l3 to t₅₆: l3→l3
Chain transitions t₁₆: l2→l1 and t₁₄: l1→l3 to t₅₇: l2→l3
Analysing control-flow refined program
Found invariant X₀ ≤ 98 ∧ 0 ≤ X₀ for location l1
Found invariant X₀ ≤ 98 ∧ 0 ≤ X₀ for location l3
CFR did not improve the program. Rolling back
CFR did not improve the program. Rolling back
Analysing control-flow refined program
Found invariant X₀ ≤ 50 ∧ 2 ≤ X₀ for location n_l1___6
Found invariant X₀ ≤ 98 ∧ 49 ≤ X₀ for location n_l1___4
Found invariant X₀ ≤ 98 ∧ 49 ≤ X₀ for location n_l3___3
Found invariant X₀ ≤ 99 ∧ 2 ≤ X₀ for location n_l3___5
Found invariant X₀ ≤ 50 ∧ 50 ≤ X₀ for location n_l1___2
Found invariant X₀ ≤ 1 ∧ 1 ≤ X₀ for location n_l1___8
Found invariant X₀ ≤ 0 ∧ 0 ≤ X₀ for location n_l3___9
Found invariant X₀ ≤ 0 ∧ 0 ≤ X₀ for location l1
Found invariant X₀ ≤ 50 ∧ 50 ≤ X₀ for location n_l3___1
Found invariant X₀ ≤ 1 ∧ 1 ≤ X₀ for location n_l3___7
MPRF for transition t₁₀₆: n_l1___6(X₀) → n_l3___5(X₀) :|: X₀ < 100 ∧ X₀ ≤ 99 ∧ X₀ ≤ 99 ∧ X₀ < 100 ∧ 0 ≤ X₀ ∧ 0 ≤ X₀ ∧ 0 ≤ X₀ ∧ X₀ ≤ 50 ∧ 2 ≤ X₀ of depth 1:
new bound:
53 {O(1)}
MPRF for transition t₁₁₂: n_l3___5(X₀) → n_l1___6(X₀+1) :|: X₀ < 50 ∧ X₀ ≤ 99 ∧ 0 ≤ X₀ ∧ 0 ≤ X₀ ∧ X₀ ≤ 99 ∧ 2 ≤ X₀ of depth 1:
new bound:
52 {O(1)}
MPRF for transition t₁₁₀: n_l3___3(X₀) → n_l1___4(X₀-1) :|: X₀ ≤ 98 ∧ 49 ≤ X₀ ∧ 50 ≤ X₀ ∧ X₀ ≤ 99 ∧ X₀ ≤ 98 ∧ 49 ≤ X₀ of depth 1:
new bound:
7300 {O(1)}
CFR did not improve the program. Rolling back
CFR did not improve the program. Rolling back
All Bounds
Timebounds
Overall timebound:inf {Infinity}
t₁₃: 1 {O(1)}
t₁₄: inf {Infinity}
t₁₆: 1 {O(1)}
t₁₇: inf {Infinity}
t₁₈: inf {Infinity}
Costbounds
Overall costbound: inf {Infinity}
t₁₃: 1 {O(1)}
t₁₄: inf {Infinity}
t₁₆: 1 {O(1)}
t₁₇: inf {Infinity}
t₁₈: inf {Infinity}
Sizebounds
t₁₃, X₀: X₀ {O(n)}
t₁₄, X₀: 99 {O(1)}
t₁₆, X₀: 0 {O(1)}
t₁₇, X₀: 50 {O(1)}
t₁₈, X₀: 98 {O(1)}