* NEWS: Summarize recent noteworthy changes.

ChangeLog

+2010-04-08  Alexandre Duret-Lutz  <adl@lrde.epita.fr>
+
+	* NEWS: Summarize recent noteworthy changes.
+
 2010-04-07  Alexandre Duret-Lutz  <adl@lrde.epita.fr>
 
 	Modernize Bison parsers.
@@ -89,7 +93,7 @@
 	Simplify F(a)|F(b) as F(a|b).  Add similar rule for G(a)&G(b).
 
 	* src/ltlvisit/basicreduce.cc (basic_reduce_visitor): Replace
-	the FG(a)|FG(b) == FG(a|b) rule by the above more generic one.
+	the FG(a)|FG(b) == F(Ga|Gb) rule by the above more generic one.
 	Add the dual rule for G(a)&G(b), as we had none (this one won't
 	improve anything in the translation, but it is more symmetric
 	this way).  Also simplify some pointer checks.

NEWS

 New in spot 0.5a
 
-  * Nothing yet.
+  * Several optimizations to improve some auxiliary steps
+    of the LTL translation (not the core of the translation):
+    - Better degeneralization
+    - SCC simplifications has been tuned for degeneralization
+      (ltl2tgba now has two options -R3 and -R3f: the latter will
+      remove every acceptance condition that used to be removed
+      in Spot 0.5 while the former will leave useless acceptance conditions
+      going to accepting SCC.  Experience shows that -R3 is more
+      favorable to degeneralization).
+    - ltl2tgba will perform SCC optimizations before degeneralization
+      and not the converse
+    - We added a syntactic simplification rule to rewrite F(a)|F(b) as F(a|b).
+      We only had a rule for the more specific FG(a)|FG(b) = F(Ga|Gb).
+    - The syntactic simplification rule for F(a&GF(b)) = F(a)&GF(b) has
+      be disabled because the latter formula is in fact harder to translate
+      efficiently.
+  * New options have been added to the CGI script for
+    - SVG output
+    - SCC simplifications
+  * Bug fixes:
+    - The precedence of the "->" and "<->" Boolean operators has been
+      adjusted to better match other tools.
+      Spot <= 0.5 used to parse "a & b -> c & d" as "a & (b -> c) & d";
+      Spot >= 0.5.1 will parse it as "(a & b) -> (c & d)".
+    - The random graph generator was fixed (again!) not to produce
+      dead states as documented.
+    - Locations in the error messages of the LTL parser were off by one.
 
 New in spot 0.5 (2010-02-01):