WORST_CASE(Omega(1),?) ### Pre-processing the ITS problem ### Initial linear ITS problem Start location: __init 0: f1_0_main_Load -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2>-1 && arg1P_1>-1 && arg1>0 ], cost: 1 1: f152_0_gcd_EQ -> f207_0_mod_LE : arg1'=arg1P_2, arg2'=arg2P_2, [ arg2>0 && arg2>arg1 && arg1>0 && arg1==arg1P_2 && arg2==arg2P_2 ], cost: 1 2: f152_0_gcd_EQ -> f207_0_mod_LE : arg1'=arg1P_3, arg2'=arg2P_3, [ arg2>0 && arg20 && arg1==arg1P_3 && arg2==arg2P_3 ], cost: 1 3: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg1P_4, arg2'=arg2P_4, [ arg2>0 && 0==arg1 && arg2==arg1P_4 && 0==arg2P_4 ], cost: 1 4: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg1P_5, arg2'=arg2P_5, [ arg1>0 && arg1==arg2 && arg1==arg1P_5 && 0==arg2P_5 ], cost: 1 5: f207_0_mod_LE -> f207_0_mod_LE : arg1'=arg1P_6, arg2'=arg2P_6, [ arg20 && arg2>0 && -arg2+arg1==arg1P_6 && arg2==arg2P_6 ], cost: 1 6: f207_0_mod_LE -> f152_0_gcd_EQ : arg1'=arg1P_7, arg2'=arg2P_7, [ arg2>arg1 && arg2==arg1P_7 && arg1==arg2P_7 ], cost: 1 7: __init -> f1_0_main_Load : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 Checking for constant complexity: The following rule is satisfiable with cost >= 1, yielding constant complexity: 7: __init -> f1_0_main_Load : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 Simplified all rules, resulting in: Start location: __init 0: f1_0_main_Load -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2>-1 && arg1P_1>-1 && arg1>0 ], cost: 1 1: f152_0_gcd_EQ -> f207_0_mod_LE : [ arg2>arg1 && arg1>0 ], cost: 1 2: f152_0_gcd_EQ -> f207_0_mod_LE : [ arg2>0 && arg2 f152_0_gcd_EQ : arg1'=arg2, arg2'=0, [ arg2>0 && 0==arg1 ], cost: 1 4: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg2'=0, [ arg1>0 && arg1==arg2 ], cost: 1 5: f207_0_mod_LE -> f207_0_mod_LE : arg1'=-arg2+arg1, [ arg20 && arg2>0 ], cost: 1 6: f207_0_mod_LE -> f152_0_gcd_EQ : arg1'=arg2, arg2'=arg1, [ arg2>arg1 ], cost: 1 7: __init -> f1_0_main_Load : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 ### Simplification by acceleration and chaining ### Accelerating simple loops of location 1. Accelerating the following rules: 3: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=0, [ arg2>0 && 0==arg1 ], cost: 1 4: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg2'=0, [ arg1>0 && arg1==arg2 ], cost: 1 Failed to prove monotonicity of the guard of rule 3. Failed to prove monotonicity of the guard of rule 4. [accelerate] Nesting with 2 inner and 2 outer candidates Accelerating simple loops of location 2. Accelerating the following rules: 5: f207_0_mod_LE -> f207_0_mod_LE : arg1'=-arg2+arg1, [ arg20 && arg2>0 ], cost: 1 Accelerated rule 5 with backward acceleration, yielding the new rule 8. [accelerate] Nesting with 1 inner and 1 outer candidates Removing the simple loops: 5. Accelerated all simple loops using metering functions (where possible): Start location: __init 0: f1_0_main_Load -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2>-1 && arg1P_1>-1 && arg1>0 ], cost: 1 1: f152_0_gcd_EQ -> f207_0_mod_LE : [ arg2>arg1 && arg1>0 ], cost: 1 2: f152_0_gcd_EQ -> f207_0_mod_LE : [ arg2>0 && arg2 f152_0_gcd_EQ : arg1'=arg2, arg2'=0, [ arg2>0 && 0==arg1 ], cost: 1 4: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg2'=0, [ arg1>0 && arg1==arg2 ], cost: 1 6: f207_0_mod_LE -> f152_0_gcd_EQ : arg1'=arg2, arg2'=arg1, [ arg2>arg1 ], cost: 1 8: f207_0_mod_LE -> f207_0_mod_LE : arg1'=-arg2*k+arg1, [ arg1>0 && arg2>0 && k>=0 && arg2<-arg2*(-1+k)+arg1 ], cost: k 7: __init -> f1_0_main_Load : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 Chained accelerated rules (with incoming rules): Start location: __init 0: f1_0_main_Load -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2>-1 && arg1P_1>-1 && arg1>0 ], cost: 1 9: f1_0_main_Load -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=0, [ arg2>-1 && arg1>0 && arg2P_1>0 ], cost: 2 10: f1_0_main_Load -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=0, [ arg2>-1 && arg1>0 && arg2P_1>0 ], cost: 2 1: f152_0_gcd_EQ -> f207_0_mod_LE : [ arg2>arg1 && arg1>0 ], cost: 1 2: f152_0_gcd_EQ -> f207_0_mod_LE : [ arg2>0 && arg2 f207_0_mod_LE : arg1'=-arg2*k+arg1, [ arg2>arg1 && arg1>0 && arg2>0 && k>=0 && arg2<-arg2*(-1+k)+arg1 ], cost: 1+k 12: f152_0_gcd_EQ -> f207_0_mod_LE : arg1'=-arg2*k+arg1, [ arg2>0 && arg20 && k>=0 && arg2<-arg2*(-1+k)+arg1 ], cost: 1+k 6: f207_0_mod_LE -> f152_0_gcd_EQ : arg1'=arg2, arg2'=arg1, [ arg2>arg1 ], cost: 1 7: __init -> f1_0_main_Load : arg1'=arg1P_8, arg2'=arg2P_8, [], cost: 1 Eliminated locations (on tree-shaped paths): Start location: __init 16: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=arg1, [ arg2>arg1 && arg1>0 ], cost: 2 17: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>arg1 && arg1>0 && arg2>0 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k 18: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>0 && arg20 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k 13: __init -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2P_8>-1 && arg1P_1>-1 && arg1P_8>0 ], cost: 2 14: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=0, [ arg2P_8>-1 && arg1P_8>0 && arg2P_1>0 ], cost: 3 15: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=0, [ arg2P_8>-1 && arg1P_8>0 && arg2P_1>0 ], cost: 3 Merged rules: Start location: __init 16: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=arg1, [ arg2>arg1 && arg1>0 ], cost: 2 17: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>arg1 && arg1>0 && arg2>0 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k 18: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>0 && arg20 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k 13: __init -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2P_8>-1 && arg1P_1>-1 && arg1P_8>0 ], cost: 2 19: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=0, [ arg2P_8>-1 && arg1P_8>0 && arg2P_1>0 ], cost: 3 Accelerating simple loops of location 1. Accelerating the following rules: 16: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=arg1, [ arg2>arg1 && arg1>0 ], cost: 2 17: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>arg1 && arg1>0 && arg2>0 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k 18: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>0 && arg20 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k Failed to prove monotonicity of the guard of rule 16. Failed to prove monotonicity of the guard of rule 17. Found no closed form for 18. [accelerate] Nesting with 2 inner and 3 outer candidates Accelerated all simple loops using metering functions (where possible): Start location: __init 16: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=arg1, [ arg2>arg1 && arg1>0 ], cost: 2 17: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>arg1 && arg1>0 && arg2>0 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k 18: f152_0_gcd_EQ -> f152_0_gcd_EQ : arg1'=arg2, arg2'=-arg2*k+arg1, [ arg2>0 && arg20 && k>=0 && arg2<-arg2*(-1+k)+arg1 && arg2>-arg2*k+arg1 ], cost: 2+k 13: __init -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2P_8>-1 && arg1P_1>-1 && arg1P_8>0 ], cost: 2 19: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=0, [ arg2P_8>-1 && arg1P_8>0 && arg2P_1>0 ], cost: 3 Chained accelerated rules (with incoming rules): Start location: __init 13: __init -> f152_0_gcd_EQ : arg1'=arg1P_1, arg2'=arg2P_1, [ arg2P_1>-1 && arg2P_8>-1 && arg1P_1>-1 && arg1P_8>0 ], cost: 2 19: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=0, [ arg2P_8>-1 && arg1P_8>0 && arg2P_1>0 ], cost: 3 20: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1, [ arg2P_1>-1 && arg2P_1>arg1P_1 && arg1P_1>0 ], cost: 4 21: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1-k*arg2P_1, [ arg2P_1>arg1P_1 && arg1P_1>0 && arg2P_1>0 && k>=0 && arg2P_1arg1P_1-k*arg2P_1 ], cost: 4+k 22: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1-k*arg2P_1, [ arg2P_1>0 && arg2P_10 && k>=0 && arg2P_1arg1P_1-k*arg2P_1 ], cost: 4+k Removed unreachable locations (and leaf rules with constant cost): Start location: __init 21: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1-k*arg2P_1, [ arg2P_1>arg1P_1 && arg1P_1>0 && arg2P_1>0 && k>=0 && arg2P_1arg1P_1-k*arg2P_1 ], cost: 4+k 22: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1-k*arg2P_1, [ arg2P_1>0 && arg2P_10 && k>=0 && arg2P_1arg1P_1-k*arg2P_1 ], cost: 4+k ### Computing asymptotic complexity ### Fully simplified ITS problem Start location: __init 21: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1-k*arg2P_1, [ arg2P_1>arg1P_1 && arg1P_1>0 && arg2P_1>0 && k>=0 && arg2P_1arg1P_1-k*arg2P_1 ], cost: 4+k 22: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1-k*arg2P_1, [ arg2P_1>0 && arg2P_10 && k>=0 && arg2P_1arg1P_1-k*arg2P_1 ], cost: 4+k Computing asymptotic complexity for rule 21 Resulting cost 0 has complexity: Unknown Computing asymptotic complexity for rule 22 Simplified the guard: 22: __init -> f152_0_gcd_EQ : arg1'=arg2P_1, arg2'=arg1P_1-k*arg2P_1, [ arg2P_1=0 && arg2P_1arg1P_1-k*arg2P_1 ], cost: 4+k Resulting cost 0 has complexity: Unknown Obtained the following overall complexity (w.r.t. the length of the input n): Complexity: Constant Cpx degree: 0 Solved cost: 1 Rule cost: 1 Rule guard: [] WORST_CASE(Omega(1),?)