Here's my version of that. The first run is on a 1MB string will all tests enabled.

The second run is on a 1GB string with the classic and s/// solutions disable because life's too short :) 

C:\test>1046579 -N=2**20
1048576
            Rate    single      long   classic       str translate
single    1.72/s        --      -99%     -100%     -100%     -100%
long       134/s     7707%        --      -71%      -79%      -81%
classic    468/s    27047%      248%        --      -26%      -33%
str        632/s    36579%      370%       35%        --       -9%
translate  695/s    40233%      417%       49%       10%        --

C:\test>1046579 -N=2**30
1073741824
            (warning: too few iterations for a reliable count)

            (warning: too few iterations for a reliable count)

          s/iter       str translate
str         1.96        --      -21%
translate   1.54       27%        --

[download]

The modified code:

<Reveal this spoiler or all in this thread>
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In reply to Re^3: In-place bitwise NOT? by BrowserUk
in thread In-place bitwise NOT? by BrowserUk

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