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/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem13_label39.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-09 17:32:30,634 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-09 17:32:30,636 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-09 17:32:30,648 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-09 17:32:30,692 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-09 17:32:30,693 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-09 17:32:30,694 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-09 17:32:30,696 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-09 17:32:30,729 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-09 17:32:30,729 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-09 17:32:30,730 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-09 17:32:30,731 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-09 17:32:30,731 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-09 17:32:30,732 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-09 17:32:30,732 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-09 17:32:30,732 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-09 17:32:30,732 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-09 17:32:30,732 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-09 17:32:30,733 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-09 17:32:30,733 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-09 17:32:30,733 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-09 17:32:30,734 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-09 17:32:30,734 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-09 17:32:30,734 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-09 17:32:30,734 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-09 17:32:30,735 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-09 17:32:30,735 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-09 17:32:30,735 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-09 17:32:30,735 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-09 17:32:30,735 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-09 17:32:30,736 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-09 17:32:30,736 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-09 17:32:30,736 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-09 17:32:30,736 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-09 17:32:30,736 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-09 17:32:30,737 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-09 17:32:30,737 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-09 17:32:30,737 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-09 17:32:30,765 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-09 17:32:30,779 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-09 17:32:30,783 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-09 17:32:30,784 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-09 17:32:30,785 INFO L275 PluginConnector]: CDTParser initialized [2019-09-09 17:32:30,786 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem13_label39.c [2019-09-09 17:32:30,843 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0c478eeb/7b81d5d3304741588b3d8049dbe18d5f/FLAG1049b9125 [2019-09-09 17:32:31,627 INFO L306 CDTParser]: Found 1 translation units. [2019-09-09 17:32:31,628 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem13_label39.c [2019-09-09 17:32:31,673 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0c478eeb/7b81d5d3304741588b3d8049dbe18d5f/FLAG1049b9125 [2019-09-09 17:32:32,165 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0c478eeb/7b81d5d3304741588b3d8049dbe18d5f [2019-09-09 17:32:32,177 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-09 17:32:32,179 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-09 17:32:32,182 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-09 17:32:32,183 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-09 17:32:32,187 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-09 17:32:32,188 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.09 05:32:32" (1/1) ... [2019-09-09 17:32:32,191 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@630c9713 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:32, skipping insertion in model container [2019-09-09 17:32:32,192 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.09 05:32:32" (1/1) ... [2019-09-09 17:32:32,199 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-09 17:32:32,355 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-09 17:32:33,946 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-09 17:32:33,957 INFO L188 MainTranslator]: Completed pre-run [2019-09-09 17:32:34,792 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-09 17:32:34,828 INFO L192 MainTranslator]: Completed translation [2019-09-09 17:32:34,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34 WrapperNode [2019-09-09 17:32:34,829 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-09 17:32:34,830 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-09 17:32:34,830 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-09 17:32:34,830 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-09 17:32:34,844 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (1/1) ... [2019-09-09 17:32:34,846 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (1/1) ... [2019-09-09 17:32:34,916 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (1/1) ... [2019-09-09 17:32:34,916 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (1/1) ... [2019-09-09 17:32:35,063 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (1/1) ... [2019-09-09 17:32:35,098 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (1/1) ... [2019-09-09 17:32:35,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (1/1) ... [2019-09-09 17:32:35,168 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-09 17:32:35,169 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-09 17:32:35,169 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-09 17:32:35,169 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-09 17:32:35,170 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (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 [2019-09-09 17:32:35,246 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-09 17:32:35,246 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-09 17:32:35,246 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-09-09 17:32:35,246 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-09-09 17:32:35,247 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-09-09 17:32:35,247 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2019-09-09 17:32:35,247 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-09 17:32:35,247 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-09-09 17:32:35,247 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-09-09 17:32:35,248 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-09-09 17:32:35,249 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2019-09-09 17:32:35,250 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-09 17:32:35,251 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-09 17:32:35,252 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-09-09 17:32:35,252 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-09 17:32:35,253 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-09 17:32:35,253 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-09 17:32:41,174 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-09 17:32:41,175 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-09 17:32:41,177 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.09 05:32:41 BoogieIcfgContainer [2019-09-09 17:32:41,177 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-09 17:32:41,178 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-09 17:32:41,179 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-09 17:32:41,182 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-09 17:32:41,182 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.09 05:32:32" (1/3) ... [2019-09-09 17:32:41,183 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2388b79b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.09 05:32:41, skipping insertion in model container [2019-09-09 17:32:41,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.09 05:32:34" (2/3) ... [2019-09-09 17:32:41,184 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2388b79b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.09 05:32:41, skipping insertion in model container [2019-09-09 17:32:41,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.09 05:32:41" (3/3) ... [2019-09-09 17:32:41,186 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem13_label39.c [2019-09-09 17:32:41,197 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-09 17:32:41,208 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-09 17:32:41,226 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-09 17:32:41,259 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-09 17:32:41,259 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-09 17:32:41,260 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-09 17:32:41,260 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-09 17:32:41,260 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-09 17:32:41,260 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-09 17:32:41,260 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-09 17:32:41,260 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-09 17:32:41,316 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states. [2019-09-09 17:32:41,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-09-09 17:32:41,332 INFO L391 BasicCegarLoop]: Found error trace [2019-09-09 17:32:41,333 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-09 17:32:41,335 INFO L418 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-09 17:32:41,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-09 17:32:41,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1910105920, now seen corresponding path program 1 times [2019-09-09 17:32:41,344 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-09 17:32:41,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:32:41,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-09 17:32:41,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:32:41,394 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-09 17:32:41,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-09 17:32:41,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-09 17:32:41,701 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-09 17:32:41,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-09 17:32:41,702 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-09 17:32:41,708 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-09 17:32:41,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-09 17:32:41,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-09 17:32:41,726 INFO L87 Difference]: Start difference. First operand 1119 states. Second operand 3 states. [2019-09-09 17:32:47,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-09 17:32:47,856 INFO L93 Difference]: Finished difference Result 1981 states and 3232 transitions. [2019-09-09 17:32:47,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-09 17:32:47,862 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 57 [2019-09-09 17:32:47,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-09 17:32:47,898 INFO L225 Difference]: With dead ends: 1981 [2019-09-09 17:32:47,898 INFO L226 Difference]: Without dead ends: 1913 [2019-09-09 17:32:47,900 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-09 17:32:47,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1913 states. [2019-09-09 17:32:48,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1913 to 1912. [2019-09-09 17:32:48,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1912 states. [2019-09-09 17:32:48,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1912 states to 1912 states and 3141 transitions. [2019-09-09 17:32:48,044 INFO L78 Accepts]: Start accepts. Automaton has 1912 states and 3141 transitions. Word has length 57 [2019-09-09 17:32:48,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-09 17:32:48,045 INFO L475 AbstractCegarLoop]: Abstraction has 1912 states and 3141 transitions. [2019-09-09 17:32:48,045 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-09 17:32:48,045 INFO L276 IsEmpty]: Start isEmpty. Operand 1912 states and 3141 transitions. [2019-09-09 17:32:48,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-09-09 17:32:48,051 INFO L391 BasicCegarLoop]: Found error trace [2019-09-09 17:32:48,051 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-09 17:32:48,052 INFO L418 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-09 17:32:48,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-09 17:32:48,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1148002277, now seen corresponding path program 1 times [2019-09-09 17:32:48,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-09 17:32:48,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:32:48,054 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-09 17:32:48,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:32:48,054 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-09 17:32:48,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-09 17:32:48,292 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-09 17:32:48,292 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-09 17:32:48,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-09 17:32:48,293 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-09 17:32:48,294 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-09 17:32:48,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-09 17:32:48,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-09 17:32:48,295 INFO L87 Difference]: Start difference. First operand 1912 states and 3141 transitions. Second operand 5 states. [2019-09-09 17:32:58,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-09 17:32:58,100 INFO L93 Difference]: Finished difference Result 3683 states and 5547 transitions. [2019-09-09 17:32:58,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-09 17:32:58,102 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 132 [2019-09-09 17:32:58,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-09 17:32:58,131 INFO L225 Difference]: With dead ends: 3683 [2019-09-09 17:32:58,131 INFO L226 Difference]: Without dead ends: 3683 [2019-09-09 17:32:58,132 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-09-09 17:32:58,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3683 states. [2019-09-09 17:32:58,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3683 to 3601. [2019-09-09 17:32:58,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3601 states. [2019-09-09 17:32:58,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3601 states to 3601 states and 5413 transitions. [2019-09-09 17:32:58,260 INFO L78 Accepts]: Start accepts. Automaton has 3601 states and 5413 transitions. Word has length 132 [2019-09-09 17:32:58,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-09 17:32:58,261 INFO L475 AbstractCegarLoop]: Abstraction has 3601 states and 5413 transitions. [2019-09-09 17:32:58,261 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-09 17:32:58,262 INFO L276 IsEmpty]: Start isEmpty. Operand 3601 states and 5413 transitions. [2019-09-09 17:32:58,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2019-09-09 17:32:58,265 INFO L391 BasicCegarLoop]: Found error trace [2019-09-09 17:32:58,265 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-09 17:32:58,266 INFO L418 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-09 17:32:58,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-09 17:32:58,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1306751103, now seen corresponding path program 1 times [2019-09-09 17:32:58,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-09 17:32:58,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:32:58,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-09 17:32:58,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:32:58,268 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-09 17:32:58,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-09 17:32:58,401 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-09 17:32:58,402 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-09 17:32:58,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-09 17:32:58,402 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-09 17:32:58,403 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-09 17:32:58,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-09 17:32:58,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-09 17:32:58,404 INFO L87 Difference]: Start difference. First operand 3601 states and 5413 transitions. Second operand 5 states. [2019-09-09 17:33:08,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-09 17:33:08,944 INFO L93 Difference]: Finished difference Result 7306 states and 10880 transitions. [2019-09-09 17:33:08,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-09 17:33:08,946 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 146 [2019-09-09 17:33:08,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-09 17:33:08,980 INFO L225 Difference]: With dead ends: 7306 [2019-09-09 17:33:08,981 INFO L226 Difference]: Without dead ends: 7306 [2019-09-09 17:33:08,981 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-09-09 17:33:08,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7306 states. [2019-09-09 17:33:09,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7306 to 7121. [2019-09-09 17:33:09,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7121 states. [2019-09-09 17:33:09,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7121 states to 7121 states and 10497 transitions. [2019-09-09 17:33:09,156 INFO L78 Accepts]: Start accepts. Automaton has 7121 states and 10497 transitions. Word has length 146 [2019-09-09 17:33:09,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-09 17:33:09,157 INFO L475 AbstractCegarLoop]: Abstraction has 7121 states and 10497 transitions. [2019-09-09 17:33:09,157 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-09 17:33:09,157 INFO L276 IsEmpty]: Start isEmpty. Operand 7121 states and 10497 transitions. [2019-09-09 17:33:09,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-09-09 17:33:09,161 INFO L391 BasicCegarLoop]: Found error trace [2019-09-09 17:33:09,161 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-09 17:33:09,162 INFO L418 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-09 17:33:09,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-09 17:33:09,162 INFO L82 PathProgramCache]: Analyzing trace with hash -589434587, now seen corresponding path program 1 times [2019-09-09 17:33:09,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-09 17:33:09,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:33:09,163 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-09 17:33:09,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:33:09,164 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-09 17:33:09,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-09 17:33:09,344 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-09 17:33:09,345 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-09 17:33:09,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-09-09 17:33:09,345 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-09 17:33:09,347 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-09 17:33:09,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-09 17:33:09,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-09-09 17:33:09,348 INFO L87 Difference]: Start difference. First operand 7121 states and 10497 transitions. Second operand 6 states. [2019-09-09 17:33:18,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-09 17:33:18,006 INFO L93 Difference]: Finished difference Result 14335 states and 22345 transitions. [2019-09-09 17:33:18,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-09 17:33:18,006 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 164 [2019-09-09 17:33:18,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-09 17:33:18,092 INFO L225 Difference]: With dead ends: 14335 [2019-09-09 17:33:18,092 INFO L226 Difference]: Without dead ends: 14335 [2019-09-09 17:33:18,094 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-09-09 17:33:18,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14335 states. [2019-09-09 17:33:18,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14335 to 14126. [2019-09-09 17:33:18,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14126 states. [2019-09-09 17:33:18,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14126 states to 14126 states and 21305 transitions. [2019-09-09 17:33:18,550 INFO L78 Accepts]: Start accepts. Automaton has 14126 states and 21305 transitions. Word has length 164 [2019-09-09 17:33:18,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-09 17:33:18,551 INFO L475 AbstractCegarLoop]: Abstraction has 14126 states and 21305 transitions. [2019-09-09 17:33:18,551 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-09 17:33:18,552 INFO L276 IsEmpty]: Start isEmpty. Operand 14126 states and 21305 transitions. [2019-09-09 17:33:18,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2019-09-09 17:33:18,555 INFO L391 BasicCegarLoop]: Found error trace [2019-09-09 17:33:18,556 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-09 17:33:18,556 INFO L418 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-09 17:33:18,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-09 17:33:18,557 INFO L82 PathProgramCache]: Analyzing trace with hash -724485451, now seen corresponding path program 1 times [2019-09-09 17:33:18,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-09 17:33:18,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:33:18,559 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-09 17:33:18,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-09 17:33:18,559 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-09 17:33:18,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-09 17:33:18,813 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-09 17:33:18,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-09 17:33:18,814 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-09 17:33:18,815 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 173 with the following transitions: [2019-09-09 17:33:18,818 INFO L207 CegarAbsIntRunner]: [0], [1], [2628], [2635], [2643], [2651], [2659], [2667], [2675], [2683], [2691], [2699], [2707], [2715], [2723], [2731], [2739], [2747], [2755], [2763], [2771], [2779], [2787], [2795], [2803], [2811], [2819], [2827], [2835], [2843], [2851], [2859], [2867], [2875], [2883], [2891], [2899], [2907], [2915], [2923], [2931], [2939], [2947], [2955], [2963], [2971], [2979], [2987], [2991], [2993], [2996], [3004], [3012], [3020], [3028], [3036], [3044], [3052], [3060], [3068], [3076], [3084], [3092], [3100], [3108], [3116], [3121], [3125], [3129], [3133], [3137], [3148], [3152], [3156], [3160], [3164], [3168], [3179], [3183], [3187], [3191], [3195], [3199], [3203], [3207], [3218], [3222], [3226], [3230], [3234], [3238], [3242], [3246], [3250], [3254], [3258], [3262], [3266], [3270], [3274], [3278], [3282], [3286], [3290], [3294], [3305], [3309], [3313], [3317], [3321], [3325], [3329], [3332], [4238], [4242], [4251], [4255], [4257], [4268], [4269], [4270], [4272], [4273] [2019-09-09 17:33:18,914 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-09 17:33:18,915 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-09 17:34:23,493 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-09-09 17:34:23,495 INFO L272 AbstractInterpreter]: Visited 119 different actions 119 times. Never merged. Never widened. Performed 160 root evaluator evaluations with a maximum evaluation depth of 17. Performed 160 inverse root evaluator evaluations with a maximum inverse evaluation depth of 17. Never found a fixpoint. Largest state had 26 variables. [2019-09-09 17:34:23,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-09 17:34:23,500 INFO L403 sIntCurrentIteration]: Generating AbsInt predicates [2019-09-09 17:35:13,884 INFO L227 lantSequenceWeakener]: Weakened 166 states. On average, predicates are now at 71.56% of their original sizes. [2019-09-09 17:35:13,884 INFO L418 sIntCurrentIteration]: Unifying AI predicates [2019-09-09 17:35:13,935 INFO L420 sIntCurrentIteration]: We unified 171 AI predicates to 171 [2019-09-09 17:35:13,936 INFO L429 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-09-09 17:35:13,937 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-09 17:35:13,937 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [7] total 13 [2019-09-09 17:35:13,937 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-09 17:35:13,938 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-09 17:35:13,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-09 17:35:13,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-09-09 17:35:13,939 INFO L87 Difference]: Start difference. First operand 14126 states and 21305 transitions. Second operand 8 states. [2019-09-09 17:37:37,625 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation.