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- Log ----------------------------------------------------------------- commit 59c50055f4538c8ba49f6f8cae403563ea76cfbb Author: Raymond Toy toy.raymond@gmail.com Date: Sat May 18 17:47:39 2013 -0700

Update.

diff --git a/src/general-info/release-20e.txt b/src/general-info/release-20e.txt index 74e024e..d9aeb5e 100644 --- a/src/general-info/release-20e.txt +++ b/src/general-info/release-20e.txt @@ -59,6 +59,7 @@ New in this release: * FILE-POSITION no longer returns incorrect values. See ticket #79. * Fix error in (format t "~ve" 21 5d-324). (See ticket #80). + * String reverse is much faster (upto 20 times)

* Trac Tickets: @@ -77,6 +78,8 @@ New in this release: * Ticket #79 fixed. * Ticket #77 fixed. * Ticket #80 fixed. + * Ticket #81 fixed. + * Ticket #83 fixed.

* Other changes: * -8 option for build-all.sh is deprecated since we don't

commit 78cce51df441b220c071024fb5e616f1928184dd Author: Raymond Toy toy.raymond@gmail.com Date: Sat May 18 17:44:02 2013 -0700

Fix ticket:81 and fix ticket:83.

From ticket 81, the tests are now:

{{{ (time (prog1 t (time-rev *s*))) ; Evaluation took: ; 0.49 seconds of real time ; 0.481813 seconds of user run time ; 0.003624 seconds of system run time ; 1,490,776,936 CPU cycles ; [Run times include 0.13 seconds GC run time] ; 0 page faults and ; 200,073,704 bytes consed.

(time (prog1 t (time-rev *s2*))) ; Evaluation took: ; 0.97 seconds of real time ; 0.965893 seconds of user run time ; 0.005139 seconds of system run time ; 2,980,415,911 CPU cycles ; [Run times include 0.23 seconds GC run time] ; 0 page faults and ; 400,005,560 bytes consed. }}}

So the new string-reverse* is 20 times faster for strings without surrogates and 10 times faster for strings containing only surrogates.

diff --git a/src/code/string.lisp b/src/code/string.lisp index 4b90930..f23db5b 100644 --- a/src/code/string.lisp +++ b/src/code/string.lisp @@ -1172,13 +1172,24 @@ (type string sequence)) (with-string sequence (let* ((length (- end start)) - (string (make-string length)) - (j length)) - (declare (type kernel:index length j)) - (loop for i = start then n as n = (%glyph-f sequence i) do - (replace string sequence :start1 (decf j (- n i)) :start2 i :end2 n) - while (< n end)) - string))) + (r (make-string length))) + (do ((dst-index (1- length) (1- dst-index)) + (src-index start (1+ src-index))) + ((minusp dst-index)) + (declare (fixnum src-index dst-index)) + (let ((current-char (schar sequence src-index))) + (cond ((and (lisp::surrogatep current-char :leading) + (plusp dst-index)) + ;; Reverse surrogate pairs correctly, which means the + ;; pair isn't reversed at all. + (incf src-index) + (setf (schar r dst-index) (schar sequence src-index)) + (decf dst-index) + (setf (schar r dst-index) current-char)) + (t + ;; Easy case + (setf (schar r dst-index) current-char))))) + r)))

#+unicode (defun string-nreverse* (sequence)

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Summary of changes: src/code/string.lisp | 25 ++++++++++++++++++------- src/general-info/release-20e.txt | 3 +++ 2 files changed, 21 insertions(+), 7 deletions(-)

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