NO
proof of /export/starexec/sandbox2/benchmark/theBenchmark.c
# AProVE Commit ID: 794c25de1cacf0d048858bcd21c9a779e1221865 marcel 20200619 unpublished dirty


Termination of the given C Problem could be disproven:

(0) C Problem
(1) CToLLVMProof [EQUIVALENT, 164 ms]
(2) LLVM problem
(3) LLVMToTerminationGraphProof [EQUIVALENT, 941 ms]
(4) LLVM Symbolic Execution Graph
(5) LLVMNonterminationProof [COMPLETE, 759 ms]
(6) NO


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(0)
Obligation:
c file /export/starexec/sandbox2/benchmark/theBenchmark.c
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(1) CToLLVMProof (EQUIVALENT)
Compiled c-file /export/starexec/sandbox2/benchmark/theBenchmark.c to LLVM.
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(2)
Obligation:
LLVM Problem

Aliases:

Data layout:

"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"

Machine:

"x86_64-pc-linux-gnu"

Type definitions:

Global variables:

Function declarations and definitions:

*BasicFunctionTypename: "__VERIFIER_nondet_int" returnParam: i32 parameters: () variableLength: false visibilityType: DEFAULT callingConvention: ccc
*BasicFunctionTypename: "main" linkageType: EXTERNALLY_VISIBLE returnParam: i32 parameters: () variableLength: false visibilityType: DEFAULT callingConvention: ccc
	0:
		%1 = alloca i32, align 4
		%i = alloca i32, align 4
		%j = alloca i32, align 4
		%t = alloca i32, align 4
		store 0, %1
		%2 = call i32 @__VERIFIER_nondet_int()
		store %2, %i
		%3 = call i32 @__VERIFIER_nondet_int()
		store %3, %j
		store 0, %t
		br %4
	4:
		%5 = load %i
		%6 = icmp sgt %5 0
		br %6, %7, %10
	7:
		%8 = load %j
		%9 = icmp sgt %8 0
		br %10
	10:
		%11 = phi [0, %4], [%9, %7]
		br %11, %12, %31
	12:
		%13 = load %i
		%14 = load %j
		%15 = icmp slt %13 %14
		br %15, %16, %20
	16:
		%17 = load %i
		store %17, %t
		%18 = load %j
		store %18, %i
		%19 = load %t
		store %19, %j
		br %30
	20:
		%21 = load %i
		%22 = load %j
		%23 = icmp sgt %21 %22
		br %23, %24, %26
	24:
		%25 = load %i
		store %25, %j
		br %29
	26:
		%27 = load %i
		%28 = sub %27 1
		store %28, %i
		br %29
	29:
		br %30
	30:
		br %4
	31:
		ret 0


Analyze Termination of all function calls matching the pattern:
main()
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(3) LLVMToTerminationGraphProof (EQUIVALENT)
Constructed symbolic execution graph for LLVM program and proved memory safety.
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(4)
Obligation:
SE Graph
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(5) LLVMNonterminationProof (COMPLETE)
Proved nontermination with the following witness:

State #135 with references set to {}.
Nondeterministic instruction %1 = alloca i32, align 4 in node #135 yields value 14.
Nondeterministic instruction %i = alloca i32, align 4 in node #136 yields value 10.
Nondeterministic instruction %j = alloca i32, align 4 in node #137 yields value 1.
Nondeterministic instruction %t = alloca i32, align 4 in node #138 yields value 5.
Nondeterministic instruction %2 = call i32 @__VERIFIER_nondet_int() in node #140 yields value 9.
Nondeterministic instruction %3 = call i32 @__VERIFIER_nondet_int() in node #142 yields value 4.

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(6)
NO