/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/SifaCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/product-lines/minepump_spec5_product31.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 18:17:15,529 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 18:17:15,531 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 18:17:15,548 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 18:17:15,549 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 18:17:15,551 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 18:17:15,552 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 18:17:15,561 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 18:17:15,565 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 18:17:15,568 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 18:17:15,570 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 18:17:15,572 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 18:17:15,572 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 18:17:15,574 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 18:17:15,577 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 18:17:15,578 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 18:17:15,579 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 18:17:15,580 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 18:17:15,582 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 18:17:15,586 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 18:17:15,590 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 18:17:15,595 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 18:17:15,596 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 18:17:15,596 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 18:17:15,598 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-24 18:17:15,599 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-24 18:17:15,599 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-24 18:17:15,601 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-24 18:17:15,602 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-24 18:17:15,603 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-24 18:17:15,603 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-24 18:17:15,604 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-24 18:17:15,604 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-24 18:17:15,605 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-24 18:17:15,607 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-24 18:17:15,607 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-24 18:17:15,607 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-24 18:17:15,608 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-24 18:17:15,608 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 18:17:15,609 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 18:17:15,610 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 18:17:15,611 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-24 18:17:15,644 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 18:17:15,645 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 18:17:15,648 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 18:17:15,648 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 18:17:15,649 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 18:17:15,649 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 18:17:15,649 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 18:17:15,649 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 18:17:15,649 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 18:17:15,650 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 18:17:15,650 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 18:17:15,650 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 18:17:15,650 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 18:17:15,650 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 18:17:15,651 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 18:17:15,652 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 18:17:15,652 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 18:17:15,653 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 18:17:15,653 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 18:17:15,654 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 18:17:15,654 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 18:17:15,654 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 18:17:15,654 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 18:17:15,654 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 18:17:15,655 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 18:17:15,655 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 18:17:15,655 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 18:17:15,655 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 18:17:15,655 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 18:17:15,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 18:17:15,658 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 18:17:15,658 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 18:17:15,658 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 18:17:15,658 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 18:17:15,658 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 18:17:15,659 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 18:17:15,659 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 18:17:15,659 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 18:17:15,927 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 18:17:15,944 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 18:17:15,948 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 18:17:15,949 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 18:17:15,949 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 18:17:15,950 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/product-lines/minepump_spec5_product31.cil.c [2019-11-24 18:17:16,027 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e35e063e/3922f9a7607c4ca6b512c13ae0a59041/FLAGe1a438c9d [2019-11-24 18:17:16,482 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 18:17:16,483 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/product-lines/minepump_spec5_product31.cil.c [2019-11-24 18:17:16,505 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e35e063e/3922f9a7607c4ca6b512c13ae0a59041/FLAGe1a438c9d [2019-11-24 18:17:16,857 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e35e063e/3922f9a7607c4ca6b512c13ae0a59041 [2019-11-24 18:17:16,865 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 18:17:16,867 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 18:17:16,868 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 18:17:16,868 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 18:17:16,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 18:17:16,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:17:16" (1/1) ... [2019-11-24 18:17:16,875 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3309b0d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:16, skipping insertion in model container [2019-11-24 18:17:16,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:17:16" (1/1) ... [2019-11-24 18:17:16,881 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 18:17:16,939 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 18:17:17,350 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 18:17:17,366 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 18:17:17,494 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 18:17:17,534 INFO L208 MainTranslator]: Completed translation [2019-11-24 18:17:17,535 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17 WrapperNode [2019-11-24 18:17:17,535 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 18:17:17,536 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 18:17:17,536 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 18:17:17,536 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 18:17:17,544 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,565 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,617 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 18:17:17,618 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 18:17:17,618 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 18:17:17,618 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 18:17:17,630 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,639 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,640 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,653 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,665 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (1/1) ... [2019-11-24 18:17:17,671 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 18:17:17,671 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 18:17:17,671 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 18:17:17,672 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 18:17:17,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:17:17" (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 [2019-11-24 18:17:17,746 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 18:17:17,746 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-11-24 18:17:17,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 18:17:17,747 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 18:17:19,675 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 18:17:19,676 INFO L284 CfgBuilder]: Removed 174 assume(true) statements. [2019-11-24 18:17:19,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:17:19 BoogieIcfgContainer [2019-11-24 18:17:19,677 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 18:17:19,678 INFO L113 PluginConnector]: ------------------------Sifa---------------------------- [2019-11-24 18:17:19,678 INFO L271 PluginConnector]: Initializing Sifa... [2019-11-24 18:17:19,678 INFO L275 PluginConnector]: Sifa initialized [2019-11-24 18:17:19,680 INFO L185 PluginConnector]: Executing the observer SifaObserver from plugin Sifa for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:17:19" (1/1) ... [2019-11-24 18:17:19,680 INFO L79 SifaObserver]: LogSizeWrapperFluid Intern Fluid=SizeLimitFluid ♦ Abstract Domain=CompoundDomain ♦ Fluid=SizeLimitFluid ♦ Max. Parallel Explicit Values=2 ♦ Max. Parallel Intervals=2 ♦ Loop Summarizer=FixpointLoopSummarizer ♦ CompoundDomain Intern Domains=ExplicitValueDomain;IntervalDomain ♦ Call Summarizer=TopInputCallSummarizer ♦ Xnf Conversion Technique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION ♦ SizeLimitFluid Max. Disjunctions=8 ♦ Simplification Technique=SIMPLIFY_QUICK ♦ SizeLimitFluid Max. DAG Size=-1 [2019-11-24 18:17:19,704 INFO L159 IcfgInterpreter]: Started Sifa with 3 locations of interest [2019-11-24 18:17:19,705 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 18:17:19,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 18:17:19,719 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 18:17:19,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 18:17:29,080 WARN L192 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 478 [2019-11-24 18:17:30,891 WARN L192 SmtUtils]: Spent 518.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 129 [2019-11-24 18:17:31,052 WARN L192 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 486 [2019-11-24 18:17:31,694 WARN L192 SmtUtils]: Spent 531.00 ms on a formula simplification. DAG size of input: 663 DAG size of output: 568 [2019-11-24 18:17:32,266 WARN L192 SmtUtils]: Spent 566.00 ms on a formula simplification. DAG size of input: 663 DAG size of output: 568 [2019-11-24 18:17:32,749 WARN L192 SmtUtils]: Spent 478.00 ms on a formula simplification. DAG size of input: 566 DAG size of output: 564 [2019-11-24 18:17:33,258 WARN L192 SmtUtils]: Spent 471.00 ms on a formula simplification that was a NOOP. DAG size: 566 [2019-11-24 18:17:33,913 WARN L192 SmtUtils]: Spent 568.00 ms on a formula simplification that was a NOOP. DAG size: 668 [2019-11-24 18:17:35,066 WARN L192 SmtUtils]: Spent 1.04 s on a formula simplification. DAG size of input: 878 DAG size of output: 750 [2019-11-24 18:17:35,885 WARN L192 SmtUtils]: Spent 812.00 ms on a formula simplification. DAG size of input: 878 DAG size of output: 750 [2019-11-24 18:17:36,731 WARN L192 SmtUtils]: Spent 842.00 ms on a formula simplification. DAG size of input: 744 DAG size of output: 742 [2019-11-24 18:17:37,926 WARN L192 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 752 [2019-11-24 18:17:40,351 WARN L192 SmtUtils]: Spent 1.41 s on a formula simplification. DAG size of input: 756 DAG size of output: 756 [2019-11-24 18:17:48,705 WARN L192 SmtUtils]: Spent 7.51 s on a formula simplification. DAG size of input: 1118 DAG size of output: 923 [2019-11-24 18:17:55,912 WARN L192 SmtUtils]: Spent 7.19 s on a formula simplification. DAG size of input: 1118 DAG size of output: 923 [2019-11-24 18:18:01,865 WARN L192 SmtUtils]: Spent 5.94 s on a formula simplification. DAG size of input: 914 DAG size of output: 871 [2019-11-24 18:18:08,564 WARN L192 SmtUtils]: Spent 6.63 s on a formula simplification. DAG size of input: 928 DAG size of output: 925 [2019-11-24 18:18:17,650 WARN L192 SmtUtils]: Spent 6.96 s on a formula simplification. DAG size of input: 926 DAG size of output: 907