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/vogal.i_5.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f57a05f [2019-01-08 14:19:07,907 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-01-08 14:19:07,909 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-01-08 14:19:07,923 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-01-08 14:19:07,923 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-01-08 14:19:07,924 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-01-08 14:19:07,926 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-01-08 14:19:07,928 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-01-08 14:19:07,929 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-01-08 14:19:07,930 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-01-08 14:19:07,931 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-01-08 14:19:07,977 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 [2019-01-08 14:19:08,008 INFO L110 SettingsManager]: Loading preferences was successful [2019-01-08 14:19:08,008 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-01-08 14:19:08,009 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-01-08 14:19:08,010 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-01-08 14:19:08,010 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-01-08 14:19:08,010 INFO L133 SettingsManager]: * User list type=DISABLED [2019-01-08 14:19:08,010 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-01-08 14:19:08,011 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-01-08 14:19:08,014 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-01-08 14:19:08,014 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2019-01-08 14:19:08,015 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2019-01-08 14:19:08,015 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-01-08 14:19:08,015 INFO L133 SettingsManager]: * Interval Domain=false [2019-01-08 14:19:08,016 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-01-08 14:19:08,016 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-01-08 14:19:08,016 INFO L133 SettingsManager]: * Use SBE=true [2019-01-08 14:19:08,017 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-01-08 14:19:08,017 INFO L133 SettingsManager]: * sizeof long=4 [2019-01-08 14:19:08,017 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-01-08 14:19:08,017 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-01-08 14:19:08,017 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-01-08 14:19:08,018 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-01-08 14:19:08,018 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-01-08 14:19:08,018 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-01-08 14:19:08,018 INFO L133 SettingsManager]: * sizeof long double=12 [2019-01-08 14:19:08,018 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-01-08 14:19:08,021 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-01-08 14:19:08,021 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-01-08 14:19:08,021 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-01-08 14:19:08,022 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-01-08 14:19:08,022 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8192 -smt2 -in -t:2000 [2019-01-08 14:19:08,022 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-01-08 14:19:08,022 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-01-08 14:19:08,022 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-01-08 14:19:08,023 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-01-08 14:19:08,023 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-01-08 14:19:08,023 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:8192 -smt2 -in [2019-01-08 14:19:08,023 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-01-08 14:19:08,023 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-01-08 14:19:08,070 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-01-08 14:19:08,087 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-01-08 14:19:08,095 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-01-08 14:19:08,097 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-01-08 14:19:08,098 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-01-08 14:19:08,100 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/vogal.i_5.bpl [2019-01-08 14:19:08,100 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/vogal.i_5.bpl' [2019-01-08 14:19:08,159 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-01-08 14:19:08,161 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-01-08 14:19:08,162 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-01-08 14:19:08,162 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-01-08 14:19:08,162 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-01-08 14:19:08,180 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,195 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,206 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-01-08 14:19:08,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-01-08 14:19:08,208 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-01-08 14:19:08,208 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-01-08 14:19:08,220 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,221 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,223 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,223 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,229 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,231 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,233 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/1) ... [2019-01-08 14:19:08,235 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-01-08 14:19:08,236 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-01-08 14:19:08,237 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-01-08 14:19:08,237 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-01-08 14:19:08,238 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (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:8192 -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:8192 -smt2 -in -t:2000 [2019-01-08 14:19:08,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-01-08 14:19:08,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-01-08 14:19:08,663 INFO L695 $ProcedureCfgBuilder]: dead code at ProgramPoint ULTIMATE.startFINAL: assume true; [2019-01-08 14:19:08,665 INFO L281 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-01-08 14:19:08,666 INFO L286 CfgBuilder]: Removed 5 assue(true) statements. [2019-01-08 14:19:08,668 INFO L202 PluginConnector]: Adding new model vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.01 02:19:08 BoogieIcfgContainer [2019-01-08 14:19:08,668 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-01-08 14:19:08,670 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-01-08 14:19:08,670 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-01-08 14:19:08,674 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-01-08 14:19:08,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 08.01 02:19:08" (1/2) ... [2019-01-08 14:19:08,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d4990dc and model type vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.01 02:19:08, skipping insertion in model container [2019-01-08 14:19:08,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "vogal.i_5.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.01 02:19:08" (2/2) ... [2019-01-08 14:19:08,679 INFO L112 eAbstractionObserver]: Analyzing ICFG vogal.i_5.bpl [2019-01-08 14:19:08,704 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-01-08 14:19:08,717 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-01-08 14:19:08,745 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-01-08 14:19:08,817 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-01-08 14:19:08,817 INFO L383 AbstractCegarLoop]: Hoare is true [2019-01-08 14:19:08,820 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-01-08 14:19:08,820 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-01-08 14:19:08,820 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-01-08 14:19:08,820 INFO L387 AbstractCegarLoop]: Difference is false [2019-01-08 14:19:08,822 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-01-08 14:19:08,822 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-01-08 14:19:08,847 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-01-08 14:19:08,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-01-08 14:19:08,855 INFO L394 BasicCegarLoop]: Found error trace [2019-01-08 14:19:08,856 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2019-01-08 14:19:08,860 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-08 14:19:08,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-08 14:19:08,867 INFO L82 PathProgramCache]: Analyzing trace with hash 28790250, now seen corresponding path program 1 times [2019-01-08 14:19:08,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-08 14:19:08,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-08 14:19:08,933 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-08 14:19:08,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-08 14:19:08,933 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-08 14:19:09,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-08 14:19:09,381 WARN L181 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2019-01-08 14:19:09,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-08 14:19:09,387 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-01-08 14:19:09,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-01-08 14:19:09,387 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-01-08 14:19:09,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-01-08 14:19:09,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-01-08 14:19:09,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-01-08 14:19:09,414 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-01-08 14:19:09,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-01-08 14:19:09,508 INFO L93 Difference]: Finished difference Result 17 states and 27 transitions. [2019-01-08 14:19:09,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-01-08 14:19:09,510 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2019-01-08 14:19:09,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-01-08 14:19:09,522 INFO L225 Difference]: With dead ends: 17 [2019-01-08 14:19:09,523 INFO L226 Difference]: Without dead ends: 12 [2019-01-08 14:19:09,527 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-01-08 14:19:09,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-01-08 14:19:09,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 8. [2019-01-08 14:19:09,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2019-01-08 14:19:09,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 11 transitions. [2019-01-08 14:19:09,564 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 11 transitions. Word has length 5 [2019-01-08 14:19:09,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-01-08 14:19:09,564 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 11 transitions. [2019-01-08 14:19:09,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-01-08 14:19:09,565 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 11 transitions. [2019-01-08 14:19:09,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-01-08 14:19:09,565 INFO L394 BasicCegarLoop]: Found error trace [2019-01-08 14:19:09,565 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-01-08 14:19:09,566 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-01-08 14:19:09,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-01-08 14:19:09,566 INFO L82 PathProgramCache]: Analyzing trace with hash 894129427, now seen corresponding path program 1 times [2019-01-08 14:19:09,566 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-01-08 14:19:09,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-08 14:19:09,567 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-01-08 14:19:09,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-01-08 14:19:09,568 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-01-08 14:19:09,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-01-08 14:19:09,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-01-08 14:19:09,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-01-08 14:19:09,721 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-01-08 14:19:09,723 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-01-08 14:19:09,726 INFO L207 CegarAbsIntRunner]: [0], [5], [7], [12], [19], [23] [2019-01-08 14:19:09,813 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2019-01-08 14:19:09,813 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2019-01-08 14:19:11,057 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation.