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This file contains a summary of important user-visible changes.
Changes since 1.3
=================
* Timed statistics are now properly updated even on process abort.
* By default, CVC4 builds in "production" mode (optimized, with fewer
internal checks on). The common alternative is a "debug" build, which
is much slower. CVC4 also builds with GPL dependences by default now
(if those libraries are available), as this is the best-performing
version of CVC4. However, the new configure option "--bsd" disables
these GPL dependences and builds the best-performing BSD-licenced version
of CVC4.
* Better automatic handling of output language setting when using CVC4
via API. Previously, the "automatic" language setting was sometimes
(though not always) defaulting to the internal "AST" language; it
should now (correctly) default to the same as the input language
(if the input language is supported as an output language), or the
"CVC4" native output language if no input language setting is applied.
Changes since 1.2
=================
New features:
* SMT-LIB-compliant support for abs, to_real, to_int, is_int, which were
previously missing
* New bv2nat/int2bv operators for bitvector/integer inter-compatibility.
* Support in linear logics for /, div, and mod by constants (with the
--rewrite-divk command line option).
* Parsing support for TPTP's TFF and TFA formats.
* A new theory of strings: word (dis-)equations, length constraints,
regular expressions.
* Increased compliance to SMT-LIBv2, numerous bugs and usability issues
resolved.
* New :command-verbosity SMT option to silence success and error messages
on a per-command basis, and API changes to Command infrastructure to
support this.
Behavioral changes:
* It is no longer permitted to request model or proof generation if there's
been an intervening push/pop.
* User-defined symbols (define-funs) are no longer reported in the output
of get-model commands.
* Exit codes are now more standard for UNIX command-line tools. Exit code
zero means no error---but the result could be sat, unsat, or unknown---and
nonzero means error.
API changes:
* Expr::substitute() now capable of substituting operators (e.g.,
function symbols under an APPLY_UF)
* Numerous improvements to the Java language bindings
Changes since 1.1
=================
* Real arithmetic now has three simplex solvers for exact precision linear
arithmetic: the classical dual solver and two new solvers based on
techniques for minimizing the sum of infeasibilities. GLPK can now be used
as a heuristic backup to the exact precision solvers. GLPK must be enabled
at configure time. See --help for more information on enabling these solvers.
* added support for "bit0" and "bit1" bitvector constants in SMT-LIB v1.2
* support for theory "alternates": new ability to prototype new decision
procedures that are selectable at runtime
* various bugfixes
Changes since 1.0
=================
* bit-vector solver now has a specialized decision procedure for unsigned bit-
vector inequalities
* numerous important bug fixes, performance improvements, and usability
improvements
* support for multiline input in interactive mode
* Win32-building support via mingw
* SMT-LIB get-model output now is easier to machine-parse: contains (model...)
* user patterns for quantifier instantiation are now supported in the
SMT-LIBv1.2 parser
* --finite-model-find was incomplete when using --incremental, now fixed
* the E-matching procedure is slightly improved
* Boolean terms are now supported in datatypes
* tuple and record support have been added to the compatibility library
* driver verbosity change: for printing all commands as they're executed, you
now need verbosity level >= 3 (e.g., -vvv) instead of level 1 (-v). This
allows tracing the solver's activities (with -v and -vv) without having too
much output.
* to make CVC4 quieter in abnormal (e.g., "warning" conditions), you can
use -q. Previously, this would silence all output (including "sat" or
"unsat") as well. Now, single -q silences messages and warnings, and
double -qq silences all output (except on exception or signal).
-- Morgan Deters <mdeters@cs.nyu.edu> Thu, 05 Dec 2013 14:22:26 -0500
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