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Re: [RFC] Statistics of non-ASCII characters in strings
- From: Rich Felker <dalias at libc dot org>
- To: libc-alpha at sourceware dot org
- Date: Mon, 22 Dec 2014 14:48:47 -0500
- Subject: Re: [RFC] Statistics of non-ASCII characters in strings
- Authentication-results: sourceware.org; auth=none
- References: <001401d01df6$0f7cc5a0$2e7650e0$ at com>
On Mon, Dec 22, 2014 at 02:46:24PM -0000, Wilco Dijkstra wrote:
> Does anyone have statistics of how often strings contain non-ASCII characters? I'm asking because
> it's feasible to make many string functions faster if they are predominantly ASCII by using a
> different check for the null byte. So if say 80-90% of strings in strcpy/strlen are ASCII then it
> would be well worth optimizing for it.
Before even bothering to research this I think you should have numbers
on how much faster it would make these functions. I don't think the
difference is noteworthy.
In any case, I think it would be a regression for programs processing
large volumes of non-English text to become slower just because
someone thought it would be clever to optimize for ASCII only...