Ozaki Kiichi wrote:
> When passing a huge text string, substitute() is too slow.
>
>
> " removing linefeeds
> " `txt' is string, read from file over 3 Mbyte and 5000 lines
>
> call substitute(txt, '\n', '', 'g')
> " 3.405360 sec.
>
> call join(split(txt, "\n"), '')
> " 0.025872 sec.
>
>
> This issues occurs because of eval.c:25123 (v7-4-475); calling STRLEN() at
> each repetition of a loop.
>
> profiling result (using google-perftools)
> https://gist.github.com/ichizok/dc82b7f3da46d4c778c3
>
> I propose a below patch.
> https://gist.github.com/ichizok/d6a494d4fb7babdf41ff
>
>
> " patched
> call substitute(txt, '\n', '', 'g')
> " 0.017540 sec.
Thanks, I'll put it in the todo list.
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