-This file contains a summary of important user-visible changes.
+This file contains a summary of important user-visible changes.
+
+Changes since 1.6
+=================
+
+New Features:
+* Proofs:
+ * Support for bit-vector proofs with eager bitblasting (older versions only
+ supported proofs with lazy bitblasting).
+* Strings:
+ * Support for `str.replaceall` operator.
+ * New option `--re-elim` to reduce regular expressions to extended string
+ operators, resulting in better performance on regular expression benchmarks
+ (enabled by default).
+* SyGuS:
+ * Support for abduction (`--sygus-abduct`). Given a formula, this option uses
+ CVC4's SyGuS solver to find a sufficient condition such that the
+ conjunction of the condition and the formula is unsatisfiable.
+ * Support for two new term enumerator strategies: variable agnostic
+ (`--sygus-active-gen=var-agnostic`) and fast (`--sygus-active-gen=enum`).
+ By default, CVC4 tries to choose the best term enumerator strategy
+ automatically based on the input (`--sygus-active-gen=auto`).
+
+Improvements:
+* Strings:
+ * Significantly better performance on string benchmarks over the core theory
+ and those with extended string functions like substring, contains, and
+ replace.
+
+Changes:
+* API change: Expr::iffExpr() is renamed to Expr::eqExpr() to reflect its
+ actual behavior.
+* Compiling the language bindings now requires SWIG 3 instead of SWIG 2.
+* The CVC3 compatibility layer has been removed.
+* The build system now uses CMake instead of Autotools. Please refer to
+ [INSTALL.md](https://github.com/CVC4/CVC4/blob/master/INSTALL.md) for
+ up-to-date instructions on how to build CVC4.
+
+Changes since 1.5
+=================
+
+New Features:
+* A new theory of floating points.
+* Novel approach for solving quantified bit-vectors (BV).
+* Eager bit-blasting: Support for SAT solver CaDiCaL.
+* A new Gaussian Elimination preprocessing pass for the theory of bit-vectors.
+* Support for transcendental functions (sin, cos, exp). In SMT2 input, this
+ can be enabled by adding T to the logic (e.g., QF_NRAT).
+* Support for new operators in strings, including string inequality (str.<=)
+ and string code (str.code).
+* Support for automated rewrite rule generation from sygus (*.sy) inputs using
+ syntax-guided enumeration (option --sygus-rr).
+
+Improvements:
+* Incremental unsat core support.
+* Further development of rewrite rules for the theory of strings and regular
+ expressions.
+* Many optimizations for syntax-guided synthesis, including improved symmetry
+ breaking for enumerative search and specialized algorithms for
+ programming-by-examples conjectures.
+
+Changes:
+* Eager bit-blasting: Removed support for SAT solver CryptoMinisat 4, added
+ support for CryptoMinisat 5.
+* The LFSC proof checker now resides in its own repository on GitHub at
+ https://github.com/CVC4/LFSC. It is not distributed with CVC4 anymore.
+
+Changes since 1.4
+=================
+
+* Improved heuristics for reasoning about non-linear arithmetic.
+* Native support for syntax-guided synthesis (sygus).
+* Support for many new heuristics for reasoning with quantifiers, including
+ finite model finding.
+* Support for proofs for uninterpreted functions, arrays, bitvectors, and
+ their combinations.
+* Performance improvements to existing theories.
+* A new theory of sets with cardinality and relations.
+* A new theory of strings.
+* Support for unsat cores.
+* Support for separation logic constraints.
+* Simplification mode "incremental" no longer supported.
+* Support for array constants in constraints.
+* Syntax for array models has changed in some language front-ends.
+* New input/output languages supported: "smt2.0" and "smtlib2.0" to
+ force SMT-LIB v2.0; "smt2.5" and "smtlib2.5" to force SMT-LIB v2.5;
+ "smt2.6" and "smtlib2.6" to force SMT-LIB v2.6;
+ "smt", "smtlib", "smt2", and "smtlib2" all refer to the current standard
+ version 2.6. If an :smt-lib-version is set in the input, that overrides
+ the command line.
+* Abstract values in SMT-LIB models are now ascribed types (with "as").
+* In SMT-LIB model output, real-sorted but integer-valued constants are
+ now printed in accordance with the standard (e.g. "1.0").
Changes since 1.3
=================
-* Timed statistics are now properly updated even on process abort.
+* CVC4 now supports libc++ in addition to libstdc++ (this especially
+ helps on Mac OS Mavericks).
+* The LFSC proof checker has been incorporated into CVC4 sources.
+* Theory of finite sets, handling the MLSS fragment (singleton, union,
+ intersection, set subtraction, membership and subset).
* 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.
+ is much slower. By default, CVC4 builds with no GPL'ed dependences.
+ However, this is not the best-performing version; for that, you should
+ configure with "--enable-gpl --best", which links against GPL'ed
+ libraries that improve usability and performance. For details on
+ licensing and dependences, see the README file.
+* Small API adjustments to Datatypes to even out the API and make it
+ function better in Java.
+* Timed statistics are now properly updated even on process abort.
* 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.
+* The SmtEngine cannot be safely copied with the copy constructor.
+ Previous versions inadvertently permitted clients to do this via the
+ API. This has been corrected, copy and assignment of the SmtEngine
+ is no longer permitted.
Changes since 1.2
=================
"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
projects / cvc5.git / blobdiff