Revision d50b0dc0 src/causality.ml
src/causality.ml  

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by duplication of some mem vars into local node vars. 
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Thus, cylic dependency errors may only arise between nomem vars. 
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nonmem variables are: 
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 inputs: not needed for causality/scheduling, needed only for detecting useless vars 

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 constants/inputs: not needed for causality/scheduling, needed only for detecting useless vars


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 read mems (fake vars): same remark as above. 
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 outputs: decoupled from mems, if necessary 
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 locals 
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let node_local_variables nd = 
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List.fold_left (fun locals v > ISet.add v.var_id locals) ISet.empty nd.node_locals 
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let node_constant_variables nd = 

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List.fold_left (fun locals v > if v.var_dec_const then ISet.add v.var_id locals else locals) ISet.empty nd.node_locals 

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let node_output_variables nd = 
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List.fold_left (fun outputs v > ISet.add v.var_id outputs) ISet.empty nd.node_outputs 
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let global_dependency node = 
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let mems = ExprDep.node_memory_variables node in 
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let inputs = ExprDep.node_input_variables node in 

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let inputs = 

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ISet.union 

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(ExprDep.node_input_variables node) 

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(ExprDep.node_constant_variables node) in 

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let outputs = ExprDep.node_output_variables node in 
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let node_vars = ExprDep.node_variables node in 
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let (g_non_mems, g_mems) = ExprDep.dependence_graph mems inputs node_vars node in 
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