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NEWS.md

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Version 1.8.0

  • Explicit Solver::clause functions to simplify clause addition.

  • More fine-grained handling of printing proof size information by adding bool print = false flags to the flush_proof_trace and the close_proof_trace API calls. The former prints the number of addition and deletion steps, while the latter prints the size of the proof size (and the actual number of bytes if compressed). The main effect is that by default printing of proof size disabled for API usage but enabled for the stand-alone solver.

Version 1.7.5

  • Decreased verbosity level for printing proof size.

Version 1.7.4

  • As fork and wait do not exist on Windows writing compressed files through pipe/fork/exec/wait has to be disabled for Windows cross compilation to go through. Alternatively one could go back to popen for writing compressed files on Windows which however is not safe and therefore we simply decided to disable that feature for windows. Compressed file reading still (and as far we are aware safely) uses popen and thus also compiles for Windows.

Version 1.7.3

  • Replaced the unsafe popen approach for compressed file writing with an explicit pipe/fork/exec/waitpid flow and accordingly removed the --safe configuration option again.

Version 1.7.2

  • Configuration option --safe disables writing to a file through popen which makes library usage safer.

Version 1.7.1

  • Added support for VeriPB proofs (--lrat --lratveripb).

  • Various fixes: LRAT proofs for constrain (which previously were not traced correctly); internal-external mapping issues for LRAT (worked for user propagator but now also in combination with LRAT); further minor bug fixes.

  • Added support for LRAT + external propagator in combination.

Version 1.7.0

  • Added native LRAT support.

Version 1.6.0

  • Added IPASIR-UP functions to the API to support external propagation, external decisions, and clause addition during search. For more details see the following paper at SAT 2023:

    Katalin Fazekas, Aina Niemetz, Mathias Preiner, Markus Kirchweger, Stefan Szeider and Armin Biere. IPASIR-UP: User Propagators for CDCL.

  • During decisions the phase set by 'void phase (int lit)' has now higher precedence than the initial phase set by options 'phase' and 'forcephase'.

Version 1.5.6

  • Clang formatted all source code (and fixed one failing regression test by disabling 'otfs' for it).

  • Implementing OTFS during conflict analysis (--otfs).

  • The last literal set by vivification is instantiated (--vivifyinst).

  • more accurate tracking of binary clauses in watch lists by updating the size in watch lists.

Version 1.5.4

  • Picking highest score literal in assumed clause ('constrain') and caching of satisfied literal by moving them to the front.

  • Added 'bool flippable (int lit)' to API.

  • Fixed 'val' to return 'lit' or '-lit' and not just '-1' and '1'.

  • Allowing 'fixed' between 'constrain' in 'mobical'.

  • Fixed LZMA magic header.

  • Added 'bool flip (int lit)' to API.

  • Fixed different garbage collection times with and without clause IDs (with './configure -l' or just './configure'). This solves issue #44 by John Reeves. At the same time made sure to trigger garbage collection independent on the number of clause header bytes by relying on the number of garbage literals instead.

  • Fixed 'mmap' usage for FreeBSD (#48 issue of 'yurivict').

  • Removed several compiler warnings when using newer compilers, including gcc-11, gcc-12, clang-14, and clang-15.

  • Replaced 'sprintf' by 'snprintf' to avoid warning on MacOS (thanks to Marijn for bringing this up).

  • Assigning a C 'FILE' pointer to 'stdout' during initialization fails on MacOS and thus separated declaration and initialization.

  • Fixed random seed initialization from MAC address issue #47 as used by 'mobical' which produces segmentation faults (thanks to Sam Bayless for pointing this out).

Version 1.5.2

  • Updates to documentation and copyright.

Version 1.5.2

  • More copyright updates in banner.

  • Fixed MinGW cross-compilation (see 'BUILD.md').

Version 1.5.1

  • Fixed copyright and added two regression traces.

Version 1.5.0

  • Added 'constrain' API call described in our FMCAD'21 paper.

  • Replaced "while () push_back ()" with "if () resize ()" idiom (thanks go to Alexander Smal for pointing this out).