New primitives sxhash-eq, sxhash-eql

* doc/lispref/hash.texi (Defining Hash), etc/NEWS: Document this.
* lisp/emacs-lisp/byte-opt.el (side-effect-free-fns):
Add sxhash-equal, sxhash-eq, sxhash-eql.
* lisp/subr.el (sxhash): Now an alias for sxhash-equal.
* src/fns.c (Fsxhash_eq, Fsxhash_eql): New functions.n

1 files changed, 11 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index d38bc3d9099..6ec82f8333c 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -217,6 +217,17 @@ outermost parenthesis.
 ** The function 'redirect-debugging-output' now works on platforms
 other than GNU/Linux.
 
++++
+** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
+Lisp object suitable for use with 'eq' and 'eql' correspondingly.  If
+two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
+('sxhash-eql') on them will be the same.
+
++++
+** Function 'sxhash' has been renamed to 'sxhash-equal' for
+consistency with the new functions.  For compatibility, 'sxhash'
+remains as an alias to 'sxhash-equal'.
+
 
 * Changes in Emacs 25.2 on Non-Free Operating Systems