java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/linear_search.i_5.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-a9d37a5-m [2019-02-28 10:37:54,843 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-02-28 10:37:54,846 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-02-28 10:37:54,859 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-02-28 10:37:54,860 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-02-28 10:37:54,861 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-02-28 10:37:54,862 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-02-28 10:37:54,865 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-02-28 10:37:54,867 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-02-28 10:37:54,868 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-02-28 10:37:54,869 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-02-28 10:37:54,897 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2019-02-28 10:37:54,911 INFO L110 SettingsManager]: Loading preferences was successful [2019-02-28 10:37:54,911 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-02-28 10:37:54,912 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-02-28 10:37:54,913 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-02-28 10:37:54,913 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-02-28 10:37:54,913 INFO L133 SettingsManager]: * User list type=DISABLED [2019-02-28 10:37:54,913 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-02-28 10:37:54,914 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-02-28 10:37:54,914 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-02-28 10:37:54,914 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2019-02-28 10:37:54,914 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2019-02-28 10:37:54,915 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-02-28 10:37:54,915 INFO L133 SettingsManager]: * Interval Domain=false [2019-02-28 10:37:54,916 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-02-28 10:37:54,916 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-02-28 10:37:54,916 INFO L133 SettingsManager]: * Use SBE=true [2019-02-28 10:37:54,916 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-02-28 10:37:54,917 INFO L133 SettingsManager]: * sizeof long=4 [2019-02-28 10:37:54,917 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-02-28 10:37:54,917 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-02-28 10:37:54,917 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-02-28 10:37:54,918 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-02-28 10:37:54,918 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-02-28 10:37:54,918 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-02-28 10:37:54,918 INFO L133 SettingsManager]: * sizeof long double=12 [2019-02-28 10:37:54,919 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-02-28 10:37:54,919 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-02-28 10:37:54,919 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-02-28 10:37:54,919 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-02-28 10:37:54,920 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-02-28 10:37:54,920 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in -t:200000 [2019-02-28 10:37:54,920 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-02-28 10:37:54,920 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-02-28 10:37:54,920 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-02-28 10:37:54,921 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-02-28 10:37:54,921 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-02-28 10:37:54,921 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in [2019-02-28 10:37:54,921 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-02-28 10:37:54,921 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-02-28 10:37:54,953 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-02-28 10:37:54,966 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-02-28 10:37:54,970 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-02-28 10:37:54,971 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-02-28 10:37:54,972 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-02-28 10:37:54,973 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/linear_search.i_5.bpl [2019-02-28 10:37:54,973 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/linear_search.i_5.bpl' [2019-02-28 10:37:55,039 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-02-28 10:37:55,042 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-02-28 10:37:55,043 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-02-28 10:37:55,043 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-02-28 10:37:55,044 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-02-28 10:37:55,065 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,082 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,095 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-02-28 10:37:55,096 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-02-28 10:37:55,096 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-02-28 10:37:55,097 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-02-28 10:37:55,110 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,111 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,113 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,114 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,132 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,136 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/1) ... [2019-02-28 10:37:55,146 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-02-28 10:37:55,149 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-02-28 10:37:55,149 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-02-28 10:37:55,150 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-02-28 10:37:55,151 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (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:16092 -smt2 -in -t:200000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:16092 -smt2 -in -t:200000 [2019-02-28 10:37:55,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-02-28 10:37:55,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-02-28 10:37:55,509 INFO L281 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-02-28 10:37:55,509 INFO L286 CfgBuilder]: Removed 1 assue(true) statements. [2019-02-28 10:37:55,510 INFO L202 PluginConnector]: Adding new model linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.02 10:37:55 BoogieIcfgContainer [2019-02-28 10:37:55,511 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-02-28 10:37:55,512 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-02-28 10:37:55,512 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-02-28 10:37:55,516 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-02-28 10:37:55,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 28.02 10:37:55" (1/2) ... [2019-02-28 10:37:55,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@149d2171 and model type linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.02 10:37:55, skipping insertion in model container [2019-02-28 10:37:55,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "linear_search.i_5.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.02 10:37:55" (2/2) ... [2019-02-28 10:37:55,520 INFO L112 eAbstractionObserver]: Analyzing ICFG linear_search.i_5.bpl [2019-02-28 10:37:55,531 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-02-28 10:37:55,540 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-02-28 10:37:55,558 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-02-28 10:37:55,594 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-02-28 10:37:55,595 INFO L383 AbstractCegarLoop]: Hoare is true [2019-02-28 10:37:55,595 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-02-28 10:37:55,595 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-02-28 10:37:55,595 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-02-28 10:37:55,595 INFO L387 AbstractCegarLoop]: Difference is false [2019-02-28 10:37:55,595 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-02-28 10:37:55,596 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-02-28 10:37:55,613 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-02-28 10:37:55,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2019-02-28 10:37:55,620 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:37:55,621 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2019-02-28 10:37:55,624 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:37:55,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:37:55,632 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2019-02-28 10:37:55,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:37:55,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:55,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:37:55,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:55,692 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:37:55,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:37:56,376 WARN L181 SmtUtils]: Spent 411.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 16 [2019-02-28 10:37:56,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-28 10:37:56,495 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-02-28 10:37:56,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-02-28 10:37:56,495 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-28 10:37:56,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-02-28 10:37:56,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-02-28 10:37:56,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-02-28 10:37:56,518 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 4 states. [2019-02-28 10:37:56,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-28 10:37:56,656 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2019-02-28 10:37:56,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-02-28 10:37:56,659 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2019-02-28 10:37:56,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-28 10:37:56,675 INFO L225 Difference]: With dead ends: 11 [2019-02-28 10:37:56,675 INFO L226 Difference]: Without dead ends: 7 [2019-02-28 10:37:56,680 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-02-28 10:37:56,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2019-02-28 10:37:56,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2019-02-28 10:37:56,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-02-28 10:37:56,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2019-02-28 10:37:56,722 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2019-02-28 10:37:56,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-28 10:37:56,722 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2019-02-28 10:37:56,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-02-28 10:37:56,722 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2019-02-28 10:37:56,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-02-28 10:37:56,723 INFO L394 BasicCegarLoop]: Found error trace [2019-02-28 10:37:56,723 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2019-02-28 10:37:56,723 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-28 10:37:56,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-28 10:37:56,724 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2019-02-28 10:37:56,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-28 10:37:56,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:56,726 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-28 10:37:56,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-28 10:37:56,726 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-28 10:37:56,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-28 10:37:57,195 WARN L181 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2019-02-28 10:37:57,263 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-02-28 10:37:57,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-28 10:37:57,264 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-28 10:37:57,265 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-02-28 10:37:57,266 INFO L207 CegarAbsIntRunner]: [0], [2], [6], [8], [10] [2019-02-28 10:37:57,353 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2019-02-28 10:37:57,354 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2019-02-28 10:37:57,554 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation.