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-Performance analysis (trunk repository)
----------------------------------------
-
-Jun 7, 2010: delayed re-typing of Ltac instances in matching
-  (-1% on HighSchoolGeometry, -2% on JordanCurveTheorem)
-
-Jun 4, 2010: improvement in eauto and type classes inference by removing
-  systematic preparation of debugging pretty-printing streams (std_ppcmds)
-  (-7% in ATBR, visible only on V8.3 logs since ATBR is broken in trunk;
-   -6% in HighSchoolGeometry)
-
-Apr 19, 2010: small improvement obtained by reducing evar instantiation 
-  from O(n^3) to O(n^2) in the size of the instance (-2% in Compcert,
-  -2% AreaMethod, -15% in Ssreflect)
-
-Apr 17, 2010: small improvement obtained by not repeating unification
-  twice in auto (-2% in Compcert, -2% in Algebra)
-
-Feb 15, 2010: Global decrease due to unicode inefficiency repaired
-
-Jan 8, 2010: Global increase due to an inefficiency in unicode treatment
-
-Dec 1, 2009 - Dec 19, 2009: Temporary addition of [forall x, P x] hints to
-  exact (generally not significative but, e.g., +25% on Subst, +8% on
-  ZFC, +5% on AreaMethod)
-
-Oct 19, 2009: Change in modules (CoLoR +35%)
-
-Aug 9, 2009: new files added in AreaMethod
-
-May 21, 2008: New version of CoRN
-  (needs +84% more time to compile)
-
-Apr 25-29, 2008: Temporary attempt with delta in eauto (Matthieu)
-  (+28% CoRN) 
-
-Apr 17, 2008: improvement probably due to commit 10807 or 10813 (bug
-  fixes, control of zeta in rewrite, auto (??))
-  (-18% Buchberger, -40% PAutomata, -28% IntMap, -43% CoRN, -13% LinAlg,
-  but CatsInZFC -0.5% only, PiCalc stable, PersistentUnionFind -1%)
-
-Mar 11, 2008:
-  (+19% PersistentUnionFind wrt Mar 3, +21% Angles, 
-   +270% Continuations between 7/3 and 18/4)
-
-Mar 7, 2008:
-  (-10% PersistentUnionFind wrt Mar 3)
-
-Feb 20, 2008: temporary 1-day slow down
-  (+64% LinAlg)
-
-Feb 14, 2008:
-  (-10% PersistentUnionFind, -19% Groups)
-
-Feb 7, 8, 2008: temporary 2-days long slow down
-  (+20 LinAlg, +50% BDDs)
-
-Feb 2, 2008: many updates of the module system
-  (-13% LinAlg, -50% AMM11262, -5% Goedel, -1% PersistentUnionFind, 
-   -42% ExactRealArithmetic, -41% Icharate, -42% Kildall, -74% SquareMatrices)
-
-Jan 1, 2008: merge of TypeClasses branch
-  (+8% PersistentUnionFind, +36% LinAlg, +76% Goedel)
-
-Nov 16, 17, 2007:
-  (+18% Cantor, +4% LinAlg, +27% IEEE1394 on 2 days)
-
-Nov 8, 2007:
-  (+18% Cantor, +16% LinAlg, +55% Continuations, +200% IEEE1394, +170% CTLTCTL,
-   +220% SquareMatrices)
-
-Oct 29, V8.1 (+ 3% geometry but CoRN, Godel, Kildall, Stalmark stables)
-
-Between Oct 12 and Oct 27, 2007: inefficiency temporarily introduced in the
-  tactic interpreter (from revision 10222 to 10267)
-  (+22% CoRN, +10% geometry, ...)
-
-Sep 16, 2007:
-  (+16% PersistentUnionFind on 3 days, LinAlg stable,
-
-Sep 4, 2007:
-  (+26% PersistentUnionFind, LinAlg stable,
-
-Jun 6, 2007: optimization of the need for type unification in with-bindings
-  (-3.5% Stalmark, -6% Kildall)
-
-May 20, 21, 22, 2007: improved inference of with-bindings (including activation
-  of unification on types)
-  (+4% PICALC, +5% Stalmark, +7% Kildall)
-
-May 11, 2007: added primitive integers (+6% CoLoR, +7% CoRN, +5% FSets, ...)
-
-Between Feb 22 and March 16, 2007: bench temporarily moved on JMN's
-  computer (-25% CoRN, -25% Fairisle, ...)
-
-Oct 29 and Oct 30, 2006: abandoned attempt to add polymorphism on definitions
-  (+4% in general during these two days)
-
-Oct 17, 2006: improvement in new field [r9248]
-  (QArith -3%, geometry: -2%)
-
-Oct 5, 2006: fixing wrong unification of Meta below binders
-  (e.g. CatsInZFC: +10%, CoRN: -2.5%, Godel: +4%, LinAlg: +7%,
-   DISTRIBUTED_REFERENCE_COUNTING: +10%, CoLoR: +1%)
-
-Sep 26, 2006: new field [r9178-9181]
-  (QArith: -16%, geometry: -5%, Float: +6%, BDDS:+5% but no ring in it)
-
-  Sep 12, 2006: Rocq/AREA_METHOD extended (~ 530s)
-  Aug 12, 2006: Rocq/AREA_METHOD added (~ 480s)
-  May 30, 2006: Nancy/CoLoR added (~ 319s)
-
-May 23, 2006: new, lighter version of polymorphic inductive types
-  (CoRN: -27%, back to Mar-24 time)
-
-May 17, 2006: changes in List.v (DISTRIBUTED_REFERENCE_COUNTING: -)
-
-May 5, 2006: improvement in closure (array instead of lists)
-  (e.g. CatsInZFC: -10%, CoRN: -3%, 
-
-May 23, 2006: polymorphic inductive types (precise, heavy algorithm)
-  (CoRN: +37%)
-
-  Dec 29, 2005: new test and use of -vm in Stalmarck
-
-  Dec 27, 2005: contrib Karatsuba added (~ 30s)
-
-Dec 28, 2005: size decrease
-  mainly due to Defined moved to Qed in FSets (reduction from 95M to 7Mo)
-
-Dec 1-14, 2005: benchmarking server down
-  between the two dates: Godel: -10%, CoRN: -10%
-  probably due to changes around vm (new informative Cast,
-  change of equality in named_context_val) 
-
-  Oct 6, 2005: contribs IPC and Tait added (~ 22s and ~ 25s)
-
-Aug 19, 2005: time decrease after application of "Array.length x=0" Xavier's 
-  suggestions for optimisation
-  (e.g. Nijmegen/QArith: -3%, Nijmegen/CoRN: -7%, Godel: -3%)
- 
-  Aug 1, 2005: contrib Kildall added (~ 65s)
-
-Jul 26-Aug 2, 2005: bench down
-
-Jul 14-15, 2005: 4 contribs failed including CoRN
-
-Jul 14, 2005: time increase after activation of "closure optimisation"
-  (e.g. Nijmegen/QArith: +8%, Nijmegen/CoRN: +3%, Godel: +13%)
-
-  Jul 7, 2005: adding contrib Fermat4
-
-  Jun 17, 2005: contrib Goodstein extended and moved to CantorOrdinals (~ 30s)
-
-  May 19, 2005: contrib Goodstein and prfx (~ 9s) added 
-
-Apr 21, 2005: strange time decrease
-  (could it be due to the change of Back and Reset mechanism) 
-  (e.g. Nijmegen/CoRN: -2%, Nijmegen/QARITH: -4%, Godel: -11%)
-
-Mar 20, 2005: fixed Logic.with_check bug
-  global time decrease (e.g. Nijmegen/CoRN: -3%, Nijmegen/QARITH: -1.5%)
-
-Jan 31-Feb 8, 2005: small instability
-  (e.g. CoRN: ~2015s -> ~1999s -> ~2032s, Godel: ~340s -> ~370s)
-
-  Jan 13, 2005: contrib SumOfTwoSquare added (~ 38s)