(byte-optimize-nth)

(byte-optimize-nthcdr): Fix for case of wrong-length forms.

1 files changed, 16 insertions, 12 deletions

diff --git a/lisp/emacs-lisp/byte-opt.el b/lisp/emacs-lisp/byte-opt.el
index 8a44ea020f3..7ccd2698b2c 100644
--- a/lisp/emacs-lisp/byte-opt.el
+++ b/lisp/emacs-lisp/byte-opt.el
@@ -1097,21 +1097,25 @@
 
 (put 'nth 'byte-optimizer 'byte-optimize-nth)
 (defun byte-optimize-nth (form)
-  (if (and (= (safe-length form) 3) (memq (nth 1 form) '(0 1)))
-      (list 'car (if (zerop (nth 1 form))
-                     (nth 2 form)
-                   (list 'cdr (nth 2 form))))
-    (byte-optimize-predicate form)))
+  (if (= (safe-length form) 3)
+      (if (memq (nth 1 form) '(0 1))
+          (list 'car (if (zerop (nth 1 form))
+                         (nth 2 form)
+                       (list 'cdr (nth 2 form))))
+        (byte-optimize-predicate form))
+    form))
 
 (put 'nthcdr 'byte-optimizer 'byte-optimize-nthcdr)
 (defun byte-optimize-nthcdr (form)
-  (if (and (= (safe-length form) 3) (not (memq (nth 1 form) '(0 1 2))))
-      (byte-optimize-predicate form)
-    (let ((count (nth 1 form)))
-      (setq form (nth 2 form))
-      (while (>= (setq count (1- count)) 0)
-        (setq form (list 'cdr form)))
-      form)))
+  (if (= (safe-length form) 3)
+      (if (memq (nth 1 form) '(0 1 2))
+          (let ((count (nth 1 form)))
+            (setq form (nth 2 form))
+            (while (>= (setq count (1- count)) 0)
+              (setq form (list 'cdr form)))
+            form)
+        (byte-optimize-predicate form))
+    form))
 
 (put 'concat 'byte-optimizer 'byte-optimize-concat)
 (defun byte-optimize-concat (form)