[etc/ChangeLog]

* NEWS: Integer overflow now yields floating-point instead of
wrapping around.
[doc/lispref/ChangeLog]
* numbers.texi (Arithmetic Operations, Math Functions): Large integers go to
floats instead of wrapping around.
* objects.texi (Integer Type): Likewise.

2 files changed, 11 insertions, 0 deletions

diff --git a/etc/ChangeLog b/etc/ChangeLog
index 0eb21406105..bd91ccc1c39 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,8 @@
+2011-05-03  Paul Eggert  <eggert@cs.ucla.edu>
+
+        * NEWS: Integer overflow now yields floating-point instead of
+        wrapping around.
+
 2011-05-03  Leo Liu  <sdl.web@gmail.com>
 
         * NEWS: Mention the new command isearch-yank-pop.
diff --git a/etc/NEWS b/etc/NEWS
index 5094ecfc4fc..669c143ba7f 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -728,6 +728,12 @@ soap-inspect.el is an interactive inspector for SOAP WSDL structures.
 
 * Incompatible Lisp Changes in Emacs 24.1
 
++++
+** Integer arithmetic overflow now yields the nearest floating-piont
+value rather than wrapping around.  For example, on a 32-bit machine,
+(1+ 536870911) yields 536870912.0, instead of the -536870912 it
+yielded in Emacs 23.3, or the 0 it yielded in Emacs 23.1.
+
 ---
 ** `char-direction-table' and the associated function `char-direction'
 were deleted.  They were buggy and inferior to the new support of