Initial revision
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Alexandre Duret-Lutz
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----------------------------------------------------------------------------
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Logfile for changes to the BDD package
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----------------------------------------------------------------------------
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+ means added code
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x means bugfix or changed code
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- means removed code
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Thanks to the following people for bug reports, suggestions and source code:
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Alan Mishchenko
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Gerd Behrmann
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Henrik Hulgaard
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Henrik Reif Andersen
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Jacob Lichtenberg
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Ken Larsen
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Nicola Soranzo
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Nikolaj Bjorner
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VER 2.2 (november 2002)
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-----------------------
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+ Added bvec_ite() for calculating an if-then-else operation on
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a boolean vector.
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x Fixed some garbage collection problems introduced in version 2.1.
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VER 2.1 (march 2002)
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--------------------
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+ Added bdd_allsat() for calculating all possible variable assignments
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to a bdd.
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x Fixed some wrong garbage collection #defines in kernel.h. If you
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haven't experinced any problems using BuDDy, then this should not
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be an issue. No bug reports reported for this one - found by code
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inspection thanx to Nicola Soranzo.
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x Fixed some copy paste errors in the prime number calculation.
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This should not be an issue. No bug reports reported for this one
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- found by code inspection thanx to Nicola Soranzo.
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VER 2.0 (march 2001)
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--------------------
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x Change the copyright notice to a more acceptable form.
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x Speedup changes in bdd_support()
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x Rewrote all the prime number calculations in order to get the
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copyright right.
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VER 1.9 (august 2000)
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---------------------
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+ Added bdd_pathcount
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+ Added bdd_anodecount
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+ Added bdd_buildcube, bdd_ibuildcube
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x Bugfix in bdd_satcountset and bdd_satcountlnset. This corrects a bug
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introduced in version 1.8.
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x bug fixes in bdd_constraint and bdd_simplify. Both did calculate a
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correct cofactor, but not necessarily a minimal one. Changed the name
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of bdd_constraint to bdd_constrain at the same time.
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x bug fix in memory allocation for bdd_addvarblock
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x Changed functions in bddop.c in order to avoid some compiler warnings.
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x Makefile also installs "fdd.h" and "bvec.h".
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x Small #include fix in N-Queen example.
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x Minor changes in the documentation.
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VER 1.8 (may 2000)
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------------------
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+ Bugfix in the kernel: canonicity was not unfortunately not guaranteed
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on certain compilers (at least the microsoft visual C compiler) due to a
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signed/unsigned bug in kernel.c (and actually not microsofts fault).
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+ Speedups in the reordering code.
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+ Added the use of an interaction matrix for variable swapping.
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+ Added bdd_satoneset
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+ Added bdd_getallocnum
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+ Added bdd_setvarorder
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+ Added bdd_unique, bdd_appuni.
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+ Added bvec_shlfixed, bvec_shrfixed and changed the prototype for
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bvec_shl and bvec_shr.
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+ Added bvec_mulfixed, bdd_divfixed, bdd_div and changed the
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prototype for bvec_mul.
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+ Added bdd_printstat
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+ Added new examples: solitare and money
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+ Forces cache tables to prime-number size.
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+ Added bdd_clear_error() if anybody needs that.
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+ Added reorder method WIN3 and WIN3ITE
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x Small change in queen.cxx - with a huge impact on runtime!
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x Bugfix in reordering. In some cases reordering would go on forever;
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first reroder, then retry, then reorder again without resize etc. always
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reordering in the same operation. Now at most one reordering is allowed
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for each bdd operation.
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x Bugfix in C++ printing in Dot format. Wrote zero for one and vice versa.
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x Bugfix in the garbage collector. If bdd_setmaxincrease was used, then
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BuDDy would call bdd_error prematurely. Not a major bug, but annoying.
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x Bugfix in bdd_load.
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x Speedup in bdd_satcountset and bdd_satcountlnset
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x Updates to the docs.
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x Updates to the makefiles
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VER 1.7 (september 1999)
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------------------------
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+ Added support for boolean vector operations used in integer arithmetics
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+ Split "bdd.h" into "bdd.h", "fdd.h" and "bvec.h"
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+ Added bdd_cachestats
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+ Added bdd_and, bdd_or, bdd_xor, bdd_impl, bdd_biimpl
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(wrappers for bdd_apply).
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+ Added a BDD calculator for combinatorial circuits as an example.
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+ Added an example showing the use of the FDD interface.
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+ Added bdd_autoreorder_times, bdd_getreorder_method, bdd_getreorder_times,
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bdd_reorder_probe, bdd_enable_reorder, bdd_disable_reorder,
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bdd_var2level, bdd_level2var, bdd_reorder_gain, bdd_swapvar
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+ Added bdd_file_hook, bdd_strm_hook, fdd_file_hook, fdd_strm_hook
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+ Added support for dynamic resizing of the operator caches with
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the function bdd_setcacheratio.
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+ Added more documentation.
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x Bugfix in reordering code. This would appear when recursive variable
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blocks were defined (blocks with sub-blocks).
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x Speedup changes in the variable reordering code
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x The automatic reordering threshhold function has been changed
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x Automatic reordering is now interrupting and restarts bdd operations
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x Prototype for bdd_reorder_hook changed.
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x Printing of reorder information (verbose level > 0) is changed.
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x The threshold for stopping of the iterative reordering methods has
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been changed. The reordering now continues until no progress is done
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at all (before it would stop when less than 5% where gained).
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x Added a few sanity checks to many of the functions.
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x Bugfix (parameter checking) in fdd_ithvar.
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- bdd_varlevel removed (use bdd_var2level and bdd_level2var).
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VER 1.6 (november 1998)
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-----------------------
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+ Added bdd_resetpair
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+ Added bdd_satcountset, bdd_satcountlnset
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+ Added macro bdd_relprod
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+ Added fdd_overlapdomain
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+ Added fdd_domain
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x Fixed a bug in bdd_setvarnum and bdd_extvarnum.
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x Fixed a bug in bdd_newpair() which would give problems with reordering.
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x Speedup changes in bdd_exist, bdd_forall, bdd_appex, bdd_appall
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x Speedup changes in bdd_restrict
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x Changed bdd_gbc_hook to include both pre and post garbage collection.
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VER 1.5 (september 1998)
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------------------------
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+ Added bdd_cofactor
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+ Added and fixed some error checks in fdd.c
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x Fixed a bug in bdd_setvarnum().
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VER 1.4 (july 1998)
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-------------------
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The package just got a name: BuDDy
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+ Added functions bdd_compose, bdd_veccompose, bdd_ite.
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+ Added functions bdd_setbddpair, bdd_setbddpairs.
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+ Added functions bdd_var, bdd_low, bdd_high.
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+ Added technical documentation in docs/tech.txt
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x Overloaded C++ functions are not used any more. This mainly changes
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the name of the printing functions in C++.
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x Changed datatype names (You'll hate me for this one):
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BddPair -> bddPair
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BddStat -> bddStat
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BddGbcStat -> bddGbcStat
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x Added slightly more documentation.
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x Some internal changes to the code - should not be visible to users.
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VER 1.3 (june 1998)
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-------------------
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x Fixed a few serious bugs in the reordering code
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VER 1.2 (june 1998)
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-------------------
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+ Added support for dynamic variable reordering
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+ Added reordering handler (bdd_reorder_hook)
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+ More added to the docs
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x Changed the event handlers (bdd_xxx_hook)
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VER 1.1 (april 1998)
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--------------------
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+ Added bdd_varprofile
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+ Added fdd_scanset
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+ Mucho better documentation.
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+ Added Henrik Reif Andersen's BDD notes to the documentation.
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+ Added BDD_REORDER_RANDOM for test purposes (usefull for others?)
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x Fixed a bug in bdd_appex and bdd_appall.
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x Fixed a bug in bdd_simplify.
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x Speed fixup to fdd_extdomain
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x Lots of small (insignificant?) bug fixes in fdd.c.
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x bdd_load/save updated to take reordering into account.
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x Generalized bdd_restrict to use a BDD variable set.
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x Fixed the identifiers for the operator caches.
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x The math functions log1p and pow2 has been removed as they didn't
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exist on some systems. The same applies to M_LN2.
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x New file structure and makefiles.
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- Removed bdd_break, bdd_restart1
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