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Notice

AISB event Bulletin Item

Announcement: Satisfiability Modulo Theories Competition SMT-COMP 2007

http://www.smtcomp.org/

CAV'07 Satellite Event

       3rd International Satisfiability Modulo Theories Competition
                               (SMT-COMP'07)

                              Berlin, Germany
                                 July 2007

                            CALL FOR BENCHMARKS
                             CALL FOR ENTRANTS

===========================================================================

Decision procedures for checking satisfiability of logical formulas are crucial
for many verification applications.  Of particular recent interest are solvers
for Satisfiability Modulo Theories (SMT).  SMT-COMP aims to spur innovation in
SMT research by providing a yearly friendly competition for SMT solvers.

SMT-COMP came out of discussions surrounding the SMT-LIB initiative, an
initiative of the SMT community to build a library of SMT benchmarks in a
proposed standard format.  SMT-COMP helps serve this goal by contributing
collected benchmark formulas used for the competition to the library, and by
providing an incentive for implementors of SMT solvers to support the SMT-LIB
format.

As part of SMT-COMP 2006, a special evening session was held at CAV 2006 in
which the competitors had a chance to present their tools and discuss them with
other competitors.  This year, a similar session will be held as part of the
SMT Workshop (July 1-2, affiliated with CAV).  More information about the SMT
Workshop can be found on the web page: http://www.lsi.upc.edu/~oliveras/smt07/

The highlights of SMT-COMP 2007 are covered below.  For the latest information,
please see the SMT-COMP web page at:

http://www.smtcomp.org/

---------------
Benchmarks
---------------

The potential benchmark divisions for this year include all of the divisions
represented last year as well as new ones.  For detailed descriptions of the
divisions, refer to the SMT-LIB web page at http://www.smtlib.org/

* QF_UF (Uninterpreted Functions): This division consists of quantifier-free
  formulas whose satisfiability is to be decided modulo the empty theory. Each
  benchmark may introduce its own uninterpreted function and predicate symbols.

* QF_IDL (Integer Difference Logic): This division consists of quantifier-free
  formulas to be tested for satisfiability modulo a background theory of
  integer arithmetic.  The syntax of atomic formulas is restricted to
  difference logic, i.e. x - y op c, where op is either equality or inequality
  and c is an integer constant.

* QF_RDL (Real Difference Logic): This division is like QF_IDL, except that the
  background theory is real arithmetic.

* QF_UFIDL (Integer Difference Logic with Uninterpreted Functions): This
  division contains benchmarks in a logic which is similar to QF_IDL, except
  that it also allows uninterpreted functions and predicates.

* QF_LIA (Linear Integer Arithmetic): This division consists of quantifier-free
  formulas to be tested for satisfiability modulo a background theory of
  integer arithmetic.  The syntax of atomic formulas is restricted to contain
  only linear terms.

* QF_LRA (Linear Real Arithmetic): This division is like QF_LIA, except that
  the background theory is real arithmetic.

* QF_UFLIA (Linear Integer Arithmetic with Uninterpreted Functions): This
  division contains benchmarks in a logic which is similar to QF_LIA, except
  that it also allows uninterpreted functions and predicates.

* QF_UFLRA (Linear Real Arithmetic with Uninterpreted Functions): This division
  contains benchmarks in a logic which is similar to QF_LRA, except that it
  also allows uninterpreted functions and predicates.

* QF_A (Arrays): Quantifier-free formulas over the theory
  of arrays (with extensionality).

* QF_AUFLIA (Linear Integer Arithmetic with Uninterpreted Functions and
  Arrays): This division consists of quantifier-free formulas to be tested for
  satisfiability modulo a background theory combining linear integer
  arithmetic, uninterpreted function and predicate symbols, and extensional
  arrays.

* QF_UFBV (Bit-vectors and Uninterpreted Functions)
  Unquantified formulas over bit vectors of fixed size, with unintepreted
  function and predicate symbols.

* QF_AUFBV (Bit-vectors with arrays and Uninterpreted Functions)
  Unquantified formulas over bit vectors of fixed size, with arrays and
  unintepreted function and predicate symbols.

* AUFLIA: (Linear Integer Arithmetic with Uninterpreted Functions and Arrays)
  This division consists of formulas with quantifiers to be tested for
  satisfiability modulo a background theory combining linear integer
  arithmetic, uninterpreted function and predicate symbols, and extensional
  arrays.

* AUFLIRA: (Arrays, Uninterpreted Functions, and Linear Arithmetic)
  This division consists of formulas with quantifiers, arrays of reals indexed
  by integers (Array1), arrays of Array1 indexed by integers (Array2), and
  linear arithmetic over the integers and reals.  This division is included to
  accommodate a large number of quantified verification benchmarks that have
  become available.

As with last year, we reserve the right to remove benchmark divisions if we do
not receive enough quality benchmarks or enough solvers in a particular
division.  If you have access to benchmarks in any of these divisions, even if
they are not in the SMT-LIB format, please contact one of the organizers (see
below).

---------------
Solvers
---------------

Please refer to http://www.smtcomp.org/ for complete details on entering the
competition.

---------------
Travel Grants
---------------

Microsoft Research has generously donated funds to help pay for travel for
participants, especially students, who might otherwise be unable to
attend. Because funds are limited, we will use a bidding process to assign
grants. The process works like this:

 1. Those interested should send an email by June 1 to Clark Barrett indicating:
    * Your name and affiliation.
    * Whether you are a student.
    * The name of the solver you are submitting and your role in the development of the solver.
    * The amount of assistance you would need to be able to attend. 

 2. On or before June 11, we will notify those whose bids have been accepted
    (acceptance will be based primarily on the amount requested, with lower bids
    having precedence, but we will also take into account the role of the
    applicant in the development of the solver and whether or not the applicant is
    a student). 

 3. Following the conclusion of the competition, reimbursement checks will be
    issued to those whose bids were accepted and who attended.

---------------
Important Dates
---------------

    * May 1:     First version of the benchmark library posted for comment.
    * June 1:    Revised version of the benchmark library posted.
                 Travel grant applications due.
    * June 7:    Travel grant notifications sent.
    * June 15:   System submission opened.
    * June 25:   Final system descriptions due, with magic numbers for
                 pseudo-random selection of benchmarks.
    * July 1-2:  SMT Workshop.
    * July 3-7:  Anticipated dates for competition.

-----------------
Organizers
-----------------

Clark Barrett (New York University, barrett@cs.nyu.edu)
Albert Oliveras (LSI Department, Technical University of Catalonia, oliveras@lsi.upc.edu)
Aaron Stump (Washington University in St. Louis, stump@cse.wustl.edu)

----------------
More Information
----------------

For details on the competition, see
http://www.smtcomp.org/

For more information on the SMT-LIB format, see
http://www.smtlib.org/

For more information about the SMT Workshop, see
http://www.lsi.upc.edu/~oliveras/smt07/

SMT-COMP is partially sponsored by the U.S. National Science Foundation, under
grant CNS-0551697.