From: Tanaka Akira <akr@...>
Date: 2008-03-24T21:50:00+09:00
Subject: Re: Changing the algorithm of String#*

In article <E1JdhWd-0004oI-T1@x61.netlab.jp>,
  Yukihiro Matsumoto <matz@ruby-lang.org> writes:

> Does this make any meaningful difference?  memcpy(), which is O(n)
> seems significant.

I implemented (and committed) similar idea for 1.9 a month ago.  (r15514)

My implementation doesn't use floating point operation, though.

% time ruby -ve '"a" * 100000000' 
ruby 1.9.0 (2008-03-24 revision 15830) [i686-linux]
-e:1: warning: useless use of * in void context
ruby -ve '"a" * 100000000'  0.12s user 0.10s system 93% cpu 0.231 total

% time ruby-1.8 -ve '"a" * 100000000'
ruby 1.8.6 (2008-03-11 patchlevel 5000) [i686-linux]
-e:1: warning: useless use of * in void context
ruby-1.8 -ve '"a" * 100000000'  3.68s user 0.08s system 97% cpu 3.843 total
-- 
Tanaka Akira