From: Mattias Engdegård <mattiase@acm.org>
Date: Sun, 5 Feb 2023 11:14:23 +0000 (+0100)
Subject: Allow unbind to commute with discardN and discardN-preserve-tos
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=17784bbf3f933dc7ed6aa286794ad7a32651e3ce;p=emacs.git

Allow unbind to commute with discardN and discardN-preserve-tos

* lisp/emacs-lisp/byte-opt.el (byte-after-unbind-ops):
Add discardN and discardN-preserve-tos, both of which
commute with unbind.  This enables subsequent optimisations.
---

diff --git a/lisp/emacs-lisp/byte-opt.el b/lisp/emacs-lisp/byte-opt.el
index a54f6595b46..feff233998d 100644
--- a/lisp/emacs-lisp/byte-opt.el
+++ b/lisp/emacs-lisp/byte-opt.el
@@ -1955,8 +1955,8 @@ See Info node `(elisp) Integer Basics'."
     byte-goto-if-not-nil-else-pop))
 
 (defconst byte-after-unbind-ops
-  ;; FIXME: add discardN, discardN-preserve-tos
    '(byte-constant byte-dup byte-stack-ref byte-stack-set byte-discard
+     byte-discardN byte-discardN-preserve-tos
      byte-symbolp byte-consp byte-stringp byte-listp byte-numberp byte-integerp
      byte-eq byte-not
      byte-cons byte-list1 byte-list2 byte-list3 byte-list4 byte-listN