Commit 10809e0f authored by Richard M. Stallman's avatar Richard M. Stallman
Browse files

(byte-compile-associative): Treat one arg case like (+ x 0).

parent 3f7e952d
......@@ -10,7 +10,7 @@
;;; This version incorporates changes up to version 2.10 of the
;;; Zawinski-Furuseth compiler.
(defconst byte-compile-version "$Revision: 2.15 $")
(defconst byte-compile-version "$Revision: 2.16 $")
;; This file is part of GNU Emacs.
......@@ -2473,12 +2473,16 @@ If FORM is a lambda or a macro, byte-compile it as a function."
;; Compile a function that accepts one or more args and is right-associative.
;; We do it by left-associativity so that the operations
;; are done in the same order as in interpreted code.
;; We treat the one-arg case, as in (+ x), like (+ x 0).
;; in order to convert markers to numbers, and trigger expected errors.
(defun byte-compile-associative (form)
(if (cdr form)
(let ((opcode (get (car form) 'byte-opcode))
(args (copy-sequence (cdr form))))
(byte-compile-form (car args))
(setq args (cdr args))
(or args (setq args '(0)
opcode (get '+ 'byte-opcode)))
(while args
(byte-compile-form (car args))
(byte-compile-out opcode 0)
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