/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-crafted/xor5.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:17:49,998 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:17:50,001 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:17:50,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:17:50,012 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:17:50,013 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:17:50,014 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:17:50,016 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:17:50,018 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:17:50,019 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:17:50,019 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:17:50,021 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:17:50,021 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:17:50,022 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:17:50,023 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:17:50,024 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:17:50,024 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:17:50,025 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:17:50,027 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:17:50,029 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:17:50,030 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:17:50,032 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:17:50,033 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:17:50,033 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:17:50,036 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 01:17:50,036 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 01:17:50,036 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 01:17:50,037 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 01:17:50,037 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 01:17:50,038 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 01:17:50,039 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 01:17:50,039 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 01:17:50,040 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 01:17:50,041 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 01:17:50,042 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 01:17:50,042 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 01:17:50,043 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 01:17:50,043 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 01:17:50,043 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:17:50,044 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:17:50,045 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:17:50,045 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 01:17:50,059 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:17:50,059 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:17:50,060 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:17:50,061 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:17:50,061 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:17:50,061 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:17:50,061 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:17:50,061 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:17:50,062 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:17:50,062 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:17:50,062 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:17:50,062 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:17:50,062 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:17:50,063 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:17:50,063 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:17:50,063 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:17:50,063 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:17:50,063 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:17:50,064 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:17:50,064 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:17:50,064 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:17:50,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:17:50,064 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:17:50,065 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:17:50,065 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:17:50,065 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:17:50,065 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:17:50,065 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:17:50,065 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 01:17:50,336 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:17:50,352 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:17:50,356 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:17:50,358 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:17:50,358 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:17:50,359 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/xor5.i [2019-11-07 01:17:50,435 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a1cb5513/7061dfff445346038e28c77296b96ec6/FLAG5c94bb856 [2019-11-07 01:17:50,926 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:17:50,927 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/xor5.i [2019-11-07 01:17:50,934 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a1cb5513/7061dfff445346038e28c77296b96ec6/FLAG5c94bb856 [2019-11-07 01:17:51,363 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a1cb5513/7061dfff445346038e28c77296b96ec6 [2019-11-07 01:17:51,390 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:17:51,392 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:17:51,398 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:17:51,398 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:17:51,406 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:17:51,407 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,419 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37d7d8b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51, skipping insertion in model container [2019-11-07 01:17:51,419 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,437 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:17:51,485 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:17:51,831 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:17:51,842 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:17:51,866 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:17:51,964 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:17:51,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51 WrapperNode [2019-11-07 01:17:51,965 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:17:51,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:17:51,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:17:51,966 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:17:51,976 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,976 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,984 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,985 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,995 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:52,000 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:52,002 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:52,004 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:17:52,005 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:17:52,005 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:17:52,005 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:17:52,006 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:17:52,068 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:17:52,068 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:17:52,068 INFO L138 BoogieDeclarations]: Found implementation of procedure xor [2019-11-07 01:17:52,069 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:17:52,069 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:17:52,069 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:17:52,069 INFO L130 BoogieDeclarations]: Found specification of procedure xor [2019-11-07 01:17:52,069 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:17:52,069 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:17:52,069 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:17:52,070 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:17:52,070 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:17:52,070 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:17:52,070 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:17:52,469 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:17:52,470 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 01:17:52,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:17:52 BoogieIcfgContainer [2019-11-07 01:17:52,471 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:17:52,472 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:17:52,473 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:17:52,476 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:17:52,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:17:51" (1/3) ... [2019-11-07 01:17:52,477 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d6f563d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:17:52, skipping insertion in model container [2019-11-07 01:17:52,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (2/3) ... [2019-11-07 01:17:52,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d6f563d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:17:52, skipping insertion in model container [2019-11-07 01:17:52,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:17:52" (3/3) ... [2019-11-07 01:17:52,479 INFO L109 eAbstractionObserver]: Analyzing ICFG xor5.i [2019-11-07 01:17:52,490 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:17:52,498 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:17:52,509 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:17:52,532 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:17:52,532 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:17:52,533 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:17:52,533 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:17:52,533 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:17:52,533 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:17:52,533 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:17:52,534 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:17:52,549 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-11-07 01:17:52,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:17:52,555 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:52,556 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:52,558 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:52,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:52,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1813361058, now seen corresponding path program 1 times [2019-11-07 01:17:52,571 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:52,571 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317852799] [2019-11-07 01:17:52,572 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:52,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:52,855 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:17:52,856 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317852799] [2019-11-07 01:17:52,857 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:17:52,857 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:17:52,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934694565] [2019-11-07 01:17:52,867 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:17:52,868 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:17:52,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:17:52,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:17:52,887 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2019-11-07 01:17:52,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:17:52,937 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2019-11-07 01:17:52,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:17:52,939 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2019-11-07 01:17:52,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:17:52,947 INFO L225 Difference]: With dead ends: 44 [2019-11-07 01:17:52,947 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:17:52,950 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:17:52,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:17:52,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:17:52,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:17:52,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 01:17:52,989 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2019-11-07 01:17:52,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:17:52,989 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 01:17:52,990 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:17:52,990 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 01:17:52,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-07 01:17:52,992 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:52,992 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:52,992 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:52,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:52,993 INFO L82 PathProgramCache]: Analyzing trace with hash 796647951, now seen corresponding path program 1 times [2019-11-07 01:17:52,993 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:52,993 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260457689] [2019-11-07 01:17:52,994 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:53,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:53,091 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:17:53,092 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260457689] [2019-11-07 01:17:53,092 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10011712] [2019-11-07 01:17:53,092 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:17:53,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:53,204 INFO L256 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:17:53,212 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:17:53,262 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:17:53,262 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:17:53,311 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:17:53,311 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1536493239] [2019-11-07 01:17:53,339 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:17:53,340 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:17:53,347 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:17:53,355 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:17:53,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:17:53,519 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:17:54,034 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 1 for LOIs [2019-11-07 01:17:54,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:17:54,038 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:17:54,253 WARN L191 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 47 [2019-11-07 01:17:55,055 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 43 [2019-11-07 01:17:55,232 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2019-11-07 01:17:55,235 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:17:55,235 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4, 17] total 25 [2019-11-07 01:17:55,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420575351] [2019-11-07 01:17:55,240 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:17:55,241 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:17:55,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:17:55,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:17:55,244 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 25 states. [2019-11-07 01:17:55,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:17:55,534 INFO L93 Difference]: Finished difference Result 36 states and 48 transitions. [2019-11-07 01:17:55,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-07 01:17:55,535 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 26 [2019-11-07 01:17:55,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:17:55,536 INFO L225 Difference]: With dead ends: 36 [2019-11-07 01:17:55,536 INFO L226 Difference]: Without dead ends: 23 [2019-11-07 01:17:55,537 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2019-11-07 01:17:55,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-07 01:17:55,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-07 01:17:55,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-07 01:17:55,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2019-11-07 01:17:55,544 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2019-11-07 01:17:55,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:17:55,545 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2019-11-07 01:17:55,545 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:17:55,545 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2019-11-07 01:17:55,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-07 01:17:55,546 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:55,546 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:55,751 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:17:55,752 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:55,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:55,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1365141180, now seen corresponding path program 1 times [2019-11-07 01:17:55,753 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:55,754 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958792369] [2019-11-07 01:17:55,754 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:55,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:55,817 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:17:55,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958792369] [2019-11-07 01:17:55,818 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:17:55,818 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:17:55,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086755733] [2019-11-07 01:17:55,819 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:17:55,819 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:17:55,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:17:55,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:17:55,820 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 4 states. [2019-11-07 01:17:55,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:17:55,859 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2019-11-07 01:17:55,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:17:55,859 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 30 [2019-11-07 01:17:55,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:17:55,860 INFO L225 Difference]: With dead ends: 33 [2019-11-07 01:17:55,861 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 01:17:55,861 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:17:55,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 01:17:55,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 01:17:55,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:17:55,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2019-11-07 01:17:55,867 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 30 [2019-11-07 01:17:55,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:17:55,869 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2019-11-07 01:17:55,869 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:17:55,869 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2019-11-07 01:17:55,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:17:55,871 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:55,871 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:55,871 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:55,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:55,872 INFO L82 PathProgramCache]: Analyzing trace with hash 765366277, now seen corresponding path program 1 times [2019-11-07 01:17:55,872 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:55,872 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021147783] [2019-11-07 01:17:55,872 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:55,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-07 01:17:56,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-07 01:17:56,105 INFO L172 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-11-07 01:17:56,105 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-07 01:17:56,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 01:17:56 BoogieIcfgContainer [2019-11-07 01:17:56,166 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-07 01:17:56,168 INFO L168 Benchmark]: Toolchain (without parser) took 4776.18 ms. Allocated memory was 135.8 MB in the beginning and 254.3 MB in the end (delta: 118.5 MB). Free memory was 100.5 MB in the beginning and 115.4 MB in the end (delta: -14.9 MB). Peak memory consumption was 103.6 MB. Max. memory is 7.1 GB. [2019-11-07 01:17:56,169 INFO L168 Benchmark]: CDTParser took 1.27 ms. Allocated memory is still 135.8 MB. Free memory was 119.0 MB in the beginning and 118.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2019-11-07 01:17:56,170 INFO L168 Benchmark]: CACSL2BoogieTranslator took 567.36 ms. Allocated memory was 135.8 MB in the beginning and 198.7 MB in the end (delta: 62.9 MB). Free memory was 100.3 MB in the beginning and 177.3 MB in the end (delta: -77.0 MB). Peak memory consumption was 23.6 MB. Max. memory is 7.1 GB. [2019-11-07 01:17:56,172 INFO L168 Benchmark]: Boogie Preprocessor took 39.53 ms. Allocated memory is still 198.7 MB. Free memory was 177.3 MB in the beginning and 174.8 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB. [2019-11-07 01:17:56,172 INFO L168 Benchmark]: RCFGBuilder took 466.33 ms. Allocated memory is still 198.7 MB. Free memory was 174.8 MB in the beginning and 153.9 MB in the end (delta: 20.9 MB). Peak memory consumption was 20.9 MB. Max. memory is 7.1 GB. [2019-11-07 01:17:56,174 INFO L168 Benchmark]: TraceAbstraction took 3693.49 ms. Allocated memory was 198.7 MB in the beginning and 254.3 MB in the end (delta: 55.6 MB). Free memory was 153.9 MB in the beginning and 115.4 MB in the end (delta: 38.5 MB). Peak memory consumption was 94.1 MB. Max. memory is 7.1 GB. [2019-11-07 01:17:56,185 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.27 ms. Allocated memory is still 135.8 MB. Free memory was 119.0 MB in the beginning and 118.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 567.36 ms. Allocated memory was 135.8 MB in the beginning and 198.7 MB in the end (delta: 62.9 MB). Free memory was 100.3 MB in the beginning and 177.3 MB in the end (delta: -77.0 MB). Peak memory consumption was 23.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 39.53 ms. Allocated memory is still 198.7 MB. Free memory was 177.3 MB in the beginning and 174.8 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 466.33 ms. Allocated memory is still 198.7 MB. Free memory was 174.8 MB in the beginning and 153.9 MB in the end (delta: 20.9 MB). Peak memory consumption was 20.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3693.49 ms. Allocated memory was 198.7 MB in the beginning and 254.3 MB in the end (delta: 55.6 MB). Free memory was 153.9 MB in the beginning and 115.4 MB in the end (delta: 38.5 MB). Peak memory consumption was 94.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 46]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of bitwiseXor at line 14. Possible FailurePath: [L6] int N; [L21] N = __VERIFIER_nondet_int() [L22] COND TRUE N > 1 [L23] int x[N]; [L24] int temp; [L25] int ret; [L26] int ret2; [L27] int ret5; [L29] int i = 0; VAL [\old(N)=0, i=0, N=2, x={1:0}] [L29] COND TRUE i < N [L31] x[i] = __VERIFIER_nondet_int() [L29] i++ VAL [\old(N)=0, i=1, N=2, x={1:0}] [L29] COND TRUE i < N [L31] x[i] = __VERIFIER_nondet_int() [L29] i++ VAL [\old(N)=0, i=2, N=2, x={1:0}] [L29] COND FALSE !(i < N) VAL [\old(N)=0, i=2, N=2, x={1:0}] [L34] CALL, EXPR xor(x) VAL [\old(N)=0, N=2, x={1:0}] [L10] int i; [L11] long long res; [L12] EXPR x[0] [L12] res = x[0] [L13] i = 1 VAL [\old(N)=0, i=1, N=2, res=0, x={1:0}, x={1:0}] [L13] COND TRUE i < N [L14] EXPR x[i] [L14] res = res ^ x[i] [L13] i++ VAL [\old(N)=0, i=2, N=2, x={1:0}, x={1:0}] [L13] COND FALSE !(i < N) [L16] return res; [L34] RET, EXPR xor(x) VAL [\old(N)=0, i=2, N=2, x={1:0}, xor(x)=0] [L34] ret = xor(x) [L36] EXPR x[0] [L36] temp=x[0] [L36] EXPR x[1] [L36] x[0] = x[1] [L36] x[1] = temp VAL [\old(N)=0, i=2, N=2, ret=0, temp=0, x={1:0}] [L37] CALL, EXPR xor(x) VAL [\old(N)=0, N=2, x={1:0}] [L10] int i; [L11] long long res; [L12] EXPR x[0] [L12] res = x[0] [L13] i = 1 VAL [\old(N)=0, i=1, N=2, res=1, x={1:0}, x={1:0}] [L13] COND TRUE i < N [L14] EXPR x[i] [L14] res = res ^ x[i] [L13] i++ VAL [\old(N)=0, i=2, N=2, x={1:0}, x={1:0}] [L13] COND FALSE !(i < N) [L16] return res; [L37] RET, EXPR xor(x) VAL [\old(N)=0, i=2, N=2, ret=0, temp=0, x={1:0}, xor(x)=-2] [L37] ret2 = xor(x) [L38] EXPR x[0] [L38] temp=x[0] [L39] int i =0 ; VAL [\old(N)=0, i=2, i=0, N=2, ret=0, ret2=-2, temp=1, x={1:0}] [L39] COND TRUE i