NEWS

   1 This file contains a summary of important user-visible changes.
   2
   3 Changes since 1.2
   4 =================
   5
   6 * SMT-LIB support for abs, to_real, to_int, is_int
   7 * Expr::substitute() now capable of substituting operators (e.g.,
   8   function symbols under an APPLY_UF)
   9 * Support in linear logics for /, div, and mod by constants.
  10 * Support for TPTP's TFF and TFA formats.
  11 * We no longer permit model or proof generation if there's been an
  12   intervening push/pop.
  13 * Increased compliance to SMT-LIBv2, numerous bugs and usability issues
  14   resolved.
  15 * New :command-verbosity SMT option to silence success and error messages
  16   on a per-command basis.  API changes to Command infrastructure to support.
  17 * A new theory of strings: word (dis-)equations, length constraints,
  18   regular expressions.
  19 * Exit codes are now more standard for UNIX command-line tools.  Exit code
  20   zero means no error---but the result could be sat, unsat, or unknown---and
  21   nonzero means error.
  22 * bv2nat/int2bv functionality
  23 * User-defined symbols (define-funs) are no longer reported in the output
  24   of get-model commands.
  25
  26 Changes since 1.1
  27 =================
  28
  29 * Real arithmetic now has three simplex solvers for exact precision linear
  30   arithmetic: the classical dual solver and two new solvers based on
  31   techniques for minimizing the sum of infeasibilities. GLPK can now be used
  32   as a heuristic backup to the exact precision solvers.  GLPK must be enabled
  33   at configure time. See --help for more information on enabling these solvers.
  34 * added support for "bit0" and "bit1" bitvector constants in SMT-LIB v1.2
  35 * support for theory "alternates": new ability to prototype new decision
  36   procedures that are selectable at runtime
  37 * various bugfixes
  38
  39 Changes since 1.0
  40 =================
  41
  42 * bit-vector solver now has a specialized decision procedure for unsigned bit-
  43   vector inequalities
  44 * numerous important bug fixes, performance improvements, and usability
  45   improvements
  46 * support for multiline input in interactive mode
  47 * Win32-building support via mingw
  48 * SMT-LIB get-model output now is easier to machine-parse: contains (model...)
  49 * user patterns for quantifier instantiation are now supported in the
  50   SMT-LIBv1.2 parser
  51 * --finite-model-find was incomplete when using --incremental, now fixed
  52 * the E-matching procedure is slightly improved
  53 * Boolean terms are now supported in datatypes
  54 * tuple and record support have been added to the compatibility library
  55 * driver verbosity change: for printing all commands as they're executed, you
  56   now need verbosity level >= 3 (e.g., -vvv) instead of level 1 (-v).  This
  57   allows tracing the solver's activities (with -v and -vv) without having too
  58   much output.
  59 * to make CVC4 quieter in abnormal (e.g., "warning" conditions), you can
  60   use -q.  Previously, this would silence all output (including "sat" or
  61   "unsat") as well.  Now, single -q silences messages and warnings, and
  62   double -qq silences all output (except on exception or signal).
  63
  64 -- Morgan Deters <mdeters@cs.nyu.edu>  Mon, 02 Dec 2013 16:58:50 -0500