Re: [PATCH] fall back to glibc matcher if a MBCSET is found

[Paolo Bonzini]

On Sun, Sep 12, 2010 at 10:46, Jim Meyering <address@hidden> wrote:
> That patch induces a performance *decrease* on at least one system.
>
> Built using --without-included-regex
> Run on an idle i920 @ 2.67GHz, kernel 2.6.18-194.11.3.el5PAE, i686:
>
>  yes 1234567890123456789012345678901234567890123456789012567890 |sed 100000q 
> > in
>  for i in $(seq 10); do env time --f=%E env LC_ALL=fr_FR.UTF8 \
>    ./grep '[a-z]' in;done

With a cs_CZ.UTF-8 locale, however the unpatched grep would likely
fail to match for example ^[a-z]$ against "ch", which is also a
correctness issue.

Regarding the failing test-case, the lack of equivalence class support
is in glibc.  Should I commit the patch without the testcase?

Paolo