diff options
Diffstat (limited to 'lisp/emacs-lisp/byte-opt.el')
| -rw-r--r-- | lisp/emacs-lisp/byte-opt.el | 34 |
1 files changed, 22 insertions, 12 deletions
diff --git a/lisp/emacs-lisp/byte-opt.el b/lisp/emacs-lisp/byte-opt.el index b7e21db688f..3eef8f385b5 100644 --- a/lisp/emacs-lisp/byte-opt.el +++ b/lisp/emacs-lisp/byte-opt.el @@ -1132,21 +1132,31 @@ See Info node `(elisp) Integer Basics'." form)) (defun byte-optimize-concat (form) - "Merge adjacent constant arguments to `concat'." + "Merge adjacent constant arguments to `concat' and flatten nested forms." (let ((args (cdr form)) (newargs nil)) (while args - (let ((strings nil) - val) - (while (and args (macroexp-const-p (car args)) - (progn - (setq val (byteopt--eval-const (car args))) - (and (or (stringp val) - (and (or (listp val) (vectorp val)) - (not (memq nil - (mapcar #'characterp val)))))))) - (push val strings) - (setq args (cdr args))) + (let ((strings nil)) + (while + (and args + (let ((arg (car args))) + (pcase arg + ;; Merge consecutive constant arguments. + ((pred macroexp-const-p) + (let ((val (byteopt--eval-const arg))) + (and (or (stringp val) + (and (or (listp val) (vectorp val)) + (not (memq nil + (mapcar #'characterp val))))) + (progn + (push val strings) + (setq args (cdr args)) + t)))) + ;; Flatten nested `concat' form. + (`(concat . ,nested-args) + (setq args (append nested-args (cdr args))) + t))))) + (when strings (let ((s (apply #'concat (nreverse strings)))) (when (not (zerop (length s))) |