Performance boost for [string is].

1 files changed, 8 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 9023354..31820e9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2009-07-20  Donal K. Fellows  <dkf@users.sf.net>
+
+	* generic/tclCmdMZ.c (StringIsCmd): Reorganize so that [string is] is
+	more efficient when parsing things that are correct, at a cost of
+	making the empty string test slightly more costly. With this, the cost
+	of doing [string is integer -strict $x] matches [catch {expr {$x+0}}]
+	in the successful case, and greatly outstrips it in the failing case.
+
 2009-07-19  Donal K. Fellows  <dkf@users.sf.net>
 
 	* generic/tclOO.decls, generic/tclOO.c (Tcl_GetObjectName): Expose a