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updated release notes for merge

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2018-05-23 18:25:14 -07:00
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RELEASE_NOTES
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RELEASE NOTES
Version 4.8.0
=============
- New requirements:
- A breaking change to the API is that parsers for SMT-LIB2 formulas return a vector of
formulas as opposed to a conjunction of formulas. The vector of formulas correspond to
the set of "assert" instructions in the SMT-LIB input.
- New features
- A parallel mode is available for select theories, including QF_BV.
By setting parallel.enable=true Z3 will spawn a number of worker threads proportional to the
number of available CPU cores to apply cube and conquer solving on the goal.
- The SAT solver by default handle cardinality and PB constraints using a custom plugin
that operates directly on cardinality and PB constraints.
- A "cube" interface is exposed over the solver API.
- Model conversion is first class over the textual API, such that subgoals created from running a
solver can be passed in text files and a model for the original formula can be recreated from the result.
- This has also led to changes in how models are tracked over tactic subgoals. The API for
extracting models from apply_result have been replaced.
- An optional mode handles xor constraints using a custom xor propagator.
It is off by default and its value not demonstrated.
- The SAT solver includes new inprocessing technques that are available during simplification.
It performs asymmetric tautology elimination by default, and one can turn on more powerful inprocessing techniques
(known as ACCE, ABCE, CCE). Asymmetric branching also uses features introduced in Lingeling by exploiting binary implication graphs.
Use sat.acce=true to enable the full repertoire of inprocessing methods. By default, clauses that are "eliminated" by acce are tagged
as lemmas (redundant) and are garbage collected if their glue level is high.
- Removed features:
- long deprecated API functions have been removed from z3_api.h
Version 4.7.1
=============