[RFC] Statistics of non-ASCII characters in strings

[Florian Weimer]

On 12/22/2014 03:46 PM, 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.

Why can't you do the equivalent of

   X = ((X & 0x80) >> 1) | (X & 0x7F);

before the new check?  Does this lengthen the dependency chain too much?

-- 
Florian Weimer / Red Hat Product Security