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Also make DiGraphTests more ScalaTest-y
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Needed for special handling in Treadle.
Small refactor that allows users of DiGraph#linearize
to return the first node found in a cycle.
Fixed RemoveWiresTransfrom to handle this.
Added test to show usage of this feature.
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* Add DiGraph sum and DiGraph sum test
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
* Make DiGraph sum deterministic
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
* Remove ordered hashes/sets from DiGraphTests
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
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This resulted in parent modules sometimes being constant proppagated
before a child module. If the child module has a constant driving one of
its outputs, the parent module would thus not see the constant. This
resulted in strange unstable constant propagation behavior where
sometimes constant outputs would not propagate.
Also add test illustrating why this occurs with uses of InstanceGraph
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