[m-rev.] diff: another 1% speedup

[Zoltan Somogyi]

This was the motivation for the suppression of purity warnings about
type-specialized predicates. That change has now installed on all the
machines with working installs.

Zoltan.

library/set.m:
library/set_ordlist.m:
	Take advantage of the sortedness of the lists we use to represent sets
	to stop set membership tests as soon as we have gone past the position
	where the searched-for item should be. This improves performance by
	about 1%.

cvs diff: Diffing .
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cvs diff: Diffing boehm_gc/Mac_files
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Index: library/set.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/library/set.m,v
retrieving revision 1.67
diff -u -b -r1.67 set.m
--- library/set.m	21 Jan 2005 06:46:40 -0000	1.67
+++ library/set.m	21 Jan 2005 14:31:35 -0000
@@ -349,7 +349,11 @@
 set__superset(SetA, SetB) :-
 	set_ordlist__superset(SetA, SetB).
 
-set__member(X, Set) :-
+:- pragma promise_pure(set__member/2).
+
+set__member(X::in, Set::in) :-
+	set_ordlist__is_member(X, Set, yes).
+set__member(X::out, Set::in) :-
 	set_ordlist__member(X, Set).
 
 set__is_member(X, Set, Result) :-
Index: library/set_ordlist.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/library/set_ordlist.m,v
retrieving revision 1.19
diff -u -b -r1.19 set_ordlist.m
--- library/set_ordlist.m	18 Jan 2005 04:27:17 -0000	1.19
+++ library/set_ordlist.m	21 Jan 2005 14:25:51 -0000
@@ -317,13 +317,24 @@
 set_ordlist__superset(Superset, Set) :-
 	set_ordlist__subset(Set, Superset).
 
-set_ordlist__member(E, S) :-
+:- pragma promise_pure(set_ordlist__member/2).
+
+set_ordlist__member(E::out, S::in) :-
 	list__member(E, S).
+set_ordlist__member(E::in, S::in) :-
+	set_ordlist__is_member(E, S, yes).
 
-set_ordlist__is_member(E, S, R) :-
-	( set_ordlist__member(E, S) ->
+set_ordlist__is_member(_E, [], no).
+set_ordlist__is_member(E, [H | T], R) :-
+	compare(Res, H, E),
+	(
+		Res = (<),
+		set_ordlist__is_member(E, T, R)
+	;
+		Res = (=),
 		R = yes
 	;
+		Res = (>),
 		R = no
 	).
 
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