NEWS

   1 This file contains a summary of important user-visible changes.
   2
   3 Changes since 1.3
   4 =================
   5
   6 * The LFSC proof checker has been incorporated into CVC4 sources.
   7 * By default, CVC4 builds in "production" mode (optimized, with fewer
   8   internal checks on).  The common alternative is a "debug" build, which
   9   is much slower.  By default, CVC4 builds with no GPL'ed dependences.
  10   However, this is not the best-performing version; for that, you should
  11   configure with "--enable-gpl --best", which links against GPL'ed
  12   libraries that improve usability and performance.  For details on
  13   licensing and dependences, see the README file.
  14 * Small API adjustments to Datatypes to even out the API and make it
  15   function better in Java.
  16 * Timed statistics are now properly updated even on process abort.
  17 * Better automatic handling of output language setting when using CVC4
  18   via API.  Previously, the "automatic" language setting was sometimes
  19   (though not always) defaulting to the internal "AST" language; it
  20   should now (correctly) default to the same as the input language
  21   (if the input language is supported as an output language), or the
  22   "CVC4" native output language if no input language setting is applied.
  23 * The SmtEngine cannot be safely copied with the copy constructor.
  24   Previous versions inadvertently permitted clients to do this via the
  25   API.  This has been corrected, copy and assignment of the SmtEngine
  26   is no longer permitted.
  27
  28 Changes since 1.2
  29 =================
  30
  31 New features:
  32 * SMT-LIB-compliant support for abs, to_real, to_int, is_int, which were
  33   previously missing
  34 * New bv2nat/int2bv operators for bitvector/integer inter-compatibility.
  35 * Support in linear logics for /, div, and mod by constants (with the
  36   --rewrite-divk command line option).
  37 * Parsing support for TPTP's TFF and TFA formats.
  38 * A new theory of strings: word (dis-)equations, length constraints,
  39   regular expressions.
  40 * Increased compliance to SMT-LIBv2, numerous bugs and usability issues
  41   resolved.
  42 * New :command-verbosity SMT option to silence success and error messages
  43   on a per-command basis, and API changes to Command infrastructure to
  44   support this.
  45
  46 Behavioral changes:
  47 * It is no longer permitted to request model or proof generation if there's
  48   been an intervening push/pop.
  49 * User-defined symbols (define-funs) are no longer reported in the output
  50   of get-model commands.
  51 * Exit codes are now more standard for UNIX command-line tools.  Exit code
  52   zero means no error---but the result could be sat, unsat, or unknown---and
  53   nonzero means error.
  54
  55 API changes:
  56 * Expr::substitute() now capable of substituting operators (e.g.,
  57   function symbols under an APPLY_UF)
  58 * Numerous improvements to the Java language bindings
  59
  60 Changes since 1.1
  61 =================
  62
  63 * Real arithmetic now has three simplex solvers for exact precision linear
  64   arithmetic: the classical dual solver and two new solvers based on
  65   techniques for minimizing the sum of infeasibilities. GLPK can now be used
  66   as a heuristic backup to the exact precision solvers.  GLPK must be enabled
  67   at configure time. See --help for more information on enabling these solvers.
  68 * added support for "bit0" and "bit1" bitvector constants in SMT-LIB v1.2
  69 * support for theory "alternates": new ability to prototype new decision
  70   procedures that are selectable at runtime
  71 * various bugfixes
  72
  73 Changes since 1.0
  74 =================
  75
  76 * bit-vector solver now has a specialized decision procedure for unsigned bit-
  77   vector inequalities
  78 * numerous important bug fixes, performance improvements, and usability
  79   improvements
  80 * support for multiline input in interactive mode
  81 * Win32-building support via mingw
  82 * SMT-LIB get-model output now is easier to machine-parse: contains (model...)
  83 * user patterns for quantifier instantiation are now supported in the
  84   SMT-LIBv1.2 parser
  85 * --finite-model-find was incomplete when using --incremental, now fixed
  86 * the E-matching procedure is slightly improved
  87 * Boolean terms are now supported in datatypes
  88 * tuple and record support have been added to the compatibility library
  89 * driver verbosity change: for printing all commands as they're executed, you
  90   now need verbosity level >= 3 (e.g., -vvv) instead of level 1 (-v).  This
  91   allows tracing the solver's activities (with -v and -vv) without having too
  92   much output.
  93 * to make CVC4 quieter in abnormal (e.g., "warning" conditions), you can
  94   use -q.  Previously, this would silence all output (including "sat" or
  95   "unsat") as well.  Now, single -q silences messages and warnings, and
  96   double -qq silences all output (except on exception or signal).
  97
  98 -- Morgan Deters <mdeters@cs.nyu.edu>  Mon, 16 Jun 2014 22:23:12 -0400