bin/71367: regex multibyte support is really slow

[Tim Robbins]

The following reply was made to PR bin/71367; it has been noted by GNATS.

From: Tim Robbins <tjr at freebsd.org>
To: Kuang-che Wu <kcwu at csie.org>
Cc: bug-followup at freebsd.org
Subject: Re: bin/71367: regex multibyte support is really slow
Date: Sat, 4 Sep 2004 20:49:07 +1000

 On Sat, Sep 04, 2004 at 05:39:33PM +0800, Kuang-che Wu wrote:
 
 > >How-To-Repeat:
 > 	$ cc -O -pipe   re.c  -o re
 > 	$ time ./re
 > 	        7.65 real         7.51 user         0.06 sys
 > 
 > #include <stdio.h>
 > #include <locale.h>
 > #include <regex.h>
 > 
 > int main(void)
 > {
 >   regex_t re;
 >   char string[1024]={
 > #define WORD 0xe6,0x85,0xa2 /* UTF-8 character */
 >     WORD, WORD, WORD, WORD, WORD, WORD, WORD, WORD, WORD, WORD,
 >     WORD, WORD, WORD, WORD, WORD, WORD, WORD, WORD, WORD, WORD,
 >     0
 >   };
 > 
 >   if(setlocale(LC_CTYPE,"zh_TW.UTF-8")==NULL)
 >     return 1;
 > 
 >   if(regcomp(&re,"[[:alnum:]]",REG_EXTENDED|REG_ICASE)!=0)
 >     return 2;
 >   if(regexec(&re,string,0,NULL,0)==0)
 >     printf("matched\n");
 > 
 >   return 0;
 > }
 
 I can't reproduce these results. I get:
 
 $ gcc -O -pipe re.c -o re
 $ time ./re
 
 real    0m0.003s
 user    0m0.000s
 sys     0m0.002s
 
 CPU: AMD Athlon(tm) 64 Processor 3000+ (2002.58-MHz K8-class CPU)
 
 Do you have any non-standard options in /etc/make.conf? Have you changed
 the C library at all locally? Can you confirm that the system you ran this
 on was idle?
 
 
 Tim