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# wasamasa/ccl-benchmark.el Created Jan 23, 2016

Fun with CCL
 ;; taken from http://www.myrkraverk.com/blog/2014/11/the-convoluted-logic-of-rot13-in-ccl/ (define-ccl-program my-ccl-rot13 '(1 ((loop (read r0) ;; The convoluted logic of rot13 in CCL. (if (r0 >= 110) ; n (if (r0 <= 122) ; z ((r0 -= 13))) ;; If we are between n-z (if (r0 >= 97) ; a (if (r0 <= 109) ; m ((r0 += 13))) ;; If we are between a-m (if (r0 >= 78) ; N (if (r0 <= 90) ; Z ((r0 -= 13))) ;; If we are between N-Z (if (r0 >= 65) ; A (if (r0 <= 77); ; M ((r0 += 13))))))) ;; If we are between A-M (write r0) (repeat))))) (defun my-ccl-rot13-string (string) (ccl-execute-on-string 'my-ccl-rot13 (vector 0 0 0 0 0 0 0 0 nil) string)) (defmacro with-timer (&rest forms) "Run the given FORMS, counting and displaying the elapsed time." (declare (indent 1)) (let ((nowvar (make-symbol "now")) (body `(progn ,@forms))) `(let ((,nowvar (current-time))) (prog1 ,body (let ((elapsed (float-time (time-subtract (current-time) ,nowvar)))) (when (> elapsed 0.001) (message "spent (%.3fs)" elapsed))))))) (defun my-rot13-string (string) (let ((result string) (i 0) (length (length string))) (while (< i length) (let ((char (upcase (aref result i)))) (cond ((and (>= char 78) (<= char 90)) (aset result i (- char 13))) ((and (>= char 65) (<= char 77)) (aset result i (+ char 13))))) (setq i (1+ i))) result)) ;; CCL version (with-timer (dotimes (_ 1000000) (my-ccl-rot13-string (my-ccl-rot13-string "foobar")))) ;; spent (6.440s) (byte-compile 'my-ccl-rot13-string) (with-timer (dotimes (_ 1000000) (my-ccl-rot13-string (my-ccl-rot13-string "foobar")))) ;; spent (6.139s) ;; homebrew version (with-timer (dotimes (_ 1000000) (my-rot13-string (my-rot13-string "foobar")))) ;; spent (17.319s) (byte-compile 'my-rot13-string) (with-timer (dotimes (_ 1000000) (my-rot13-string (my-rot13-string "foobar")))) ;; spent (4.375s) ;; official version (with-timer (dotimes (_ 1000000) (rot13-string (rot13-string "foobar")))) ;; spent (58.162s) ;; NOTE no need for a byte-compiled test since it already comes ;; byte-compiled, makes one wonder though why it's so much slower...
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