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Background external invariants

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Background external invariants are constraints that are assumed to be
true of the system. This commit introduces a mode in which
background invariants are used only duing inductive generalization
and lemma pushing, but not during predecessor computation.

It is believed that this will be more efficient used of background
external invariants since they will not be able to disturb how
predecessors are generalized and computed.

Based on a patch by Jorge Navas
This commit is contained in:
Arie Gurfinkel 2018-08-13 15:01:16 -04:00
parent 533e9c5837
commit 0035d9b8cb
3 changed files with 132 additions and 58 deletions
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1
src/muz/base/fp_params.pyg
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@ -177,5 +177,6 @@ def_module_params('fp',
('spacer.dump_threshold', DOUBLE, 5.0, 'Threshold in seconds on dumping benchmarks'),
('spacer.gpdr', BOOL, False, 'Use GPDR solving strategy for non-linear CHC'),
('spacer.gpdr.bfs', BOOL, True, 'Use BFS exploration strategy for expanding model search'),
('spacer.use_bg_invs', BOOL, False, 'Enable external background invariants'),
))