------ version 0.03 ------
Fri Aug  6 01:57:28 1993  Tom Lord  (lord@unix1.andrew.cmu.edu)

	* rx.c (re_search_2): sped up the fastmap search a little
	  to as to not be slower than regex.c on simple patterns.
	  Rx will still lose by a couple instructions in some degenerate
	  cases but mostly will win.

Thu Aug  5 11:39:57 1993  Tom Lord  (lord@thisbe.weh.andrew.cmu.edu)

	* rx.c (re_search_2 & compilation front-ends): cache the starting
	  superset of super-nfa's so that it isn't necessary to do an
	  eclosure union for every call to re_search_2.

	* rx.c (re_search_2): (from Eric Backus) arrange to call
	  alloca(0) from a shallower stack frame than re_search_2
	  if callling it at all.

	  This could use a better cpp test.  Right now, an extra function
	  call is added to re_search_2 unles __GNUC__ is defined.  If
	  there were something like _HAVE_LOSER_ALLOCA_....
	  
	* rx.c (rx_compile, re_search_2, several new fns):
	  changed the order of side effect lists so that possible
	  futures that begin with complex effects more to the right
	  are explored after futures more to the left.  Added
	  a noop complex effect to alts and stars to guarantee
	  they are explored in the right order.  An optimization
	  after the parse removes some from the alts (and not all
	  stars get them in the first place).  Changed the `best
	  match' criterea -- now that possible futures are ordered
	  posixly, we only want to check the length of the match.
	  For a given length, the best subexpression partitioning
	  is the first one found.

	  A side effect of this is that Rx will always return the
	  same register assignements for a given regexp/input text.
	  Bummer :-) / 2.


------ version 0.02 ------

ed Jul 21 13:10:56 1993  Tom Lord  (lord@unix8.andrew.cmu.edu)

	* rx.c (re_search_2): elaborated on the rule for picking the 
	  best match so that the lengths of subexpressions are taken
	  into account.  This is for Posix compatability.


------ version 0.01 ------

Sun Jun 13 17:20:35 1993  Tom Lord  (lord@tsunami.ucc.andrew.cmu.edu)

	* This is the first release of rx.c.  Although some of the code
	  is derived from regex.c, there is not much continuity between
	  the two implementations.



