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[perl #122655] 5.20 regression: '"X" !~ /[x]/i', when pattern is UTF-8

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From:
karl williamson
Date:
August 30, 2014 17:20
Subject:
[perl #122655] 5.20 regression: '"X" !~ /[x]/i', when pattern is UTF-8
Message ID:
rt-4.0.18-9220-1409419209-365.122655-75-0@perl.org
# New Ticket Created by  karl williamson 
# Please include the string:  [perl #122655]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=122655 >


This is a bug report for perl from khw@khw.(none),
generated with the help of perlbug 1.40 running under perl 5.21.4.


-----------------------------------------------------------------
A regression was introduced by this:
commit 0ba8faef1d393a5e5eec58121e95c78331a76dda
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sat Feb 15 14:45:03 2014 -0700

     Convert more EXACTFish nodes to EXACT when possible

     Under /i matching, many characters match only themselves, such a
     punctuation.  If a node contains only such characters it can be an 
EXACT
     node.  The optimizer gets better hints when dealing with EXACT nodes
     than ones with folding.

     This changes the alloc_maybe_populate() function to look for
     possibilities of non-folding input.

A patch is smoking.
-----------------------------------------------------------------
---
Flags:
     category=core
     severity=high
---
Site configuration information for perl 5.21.4:

Configured by khw at Sat Aug 30 06:56:50 MDT 2014.

Summary of my perl5 (revision 5 version 21 subversion 4) configuration:
   Commit id: ef0f35a3bbd8050732ecbd53267e83e7e7de7844
   Platform:
     osname=linux, osvers=3.13.0-35-generic, 
archname=x86_64-linux-thread-multi-ld
     uname='linux khw 3.13.0-35-generic #62-ubuntu smp fri aug 15 
01:58:42 utc 2014 x86_64 x86_64 x86_64 gnulinux '
     config_args='-des -Uversiononly -Dprefix=/home/khw/blead -Dusedevel 
-D'optimize=-g' -A'optimize=-g' -A'optimize=-O0' 
-Accflags='-DPERL_BOOL_AS_CHAR' -Dman1dir=none -Dman3dir=none 
-DDEBUGGING -DDEBUGGING -Dcc=g++ -Dusemorebits -Dusethreads'
     hint=recommended, useposix=true, d_sigaction=define
     useithreads=define, usemultiplicity=define
     use64bitint=define, use64bitall=define, uselongdouble=define
     usemymalloc=n, bincompat5005=undef
   Compiler:
     cc='g++', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DPERL_BOOL_AS_CHAR 
-fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector 
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 
-D_FORTIFY_SOURCE=2',
     optimize='-g -g -O0',
     cppflags='-D_REENTRANT -D_GNU_SOURCE -DPERL_BOOL_AS_CHAR -fwrapv 
-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector 
-I/usr/local/include'
     ccversion='', gccversion='4.8.2', gccosandvers=''
     intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
     d_longlong=define, longlongsize=8, d_longdbl=define, 
longdblsize=16, longdblkind=3
     ivtype='long', ivsize=8, nvtype='long double', nvsize=16, 
Off_t='off_t', lseeksize=8
     alignbytes=16, prototype=define
   Linker and Libraries:
     ld='g++', ldflags =' -fstack-protector -L/usr/local/lib'
     libpth=/usr/include/c++/4.8 /usr/include/x86_64-linux-gnu/c++/4.8 
/usr/include/c++/4.8/backward /usr/local/lib 
/usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed 
/usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib 
/usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
     libs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
     perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
     libc=libc-2.19.so, so=so, useshrplib=false, libperl=libperl.a
     gnulibc_version='2.19'
   Dynamic Linking:
     dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
     cccdlflags='-fPIC', lddlflags='-shared -g -g -O0 -L/usr/local/lib 
-fstack-protector'


---
@INC for perl 5.21.4:
     /home/khw/perl/blead/lib
     /home/khw/blead/lib/perl5/site_perl/5.21.4/x86_64-linux-thread-multi-ld
     /home/khw/blead/lib/perl5/site_perl/5.21.4
     /home/khw/blead/lib/perl5/5.21.4/x86_64-linux-thread-multi-ld
     /home/khw/blead/lib/perl5/5.21.4
     /home/khw/blead/lib/perl5/site_perl/5.21.3
     /home/khw/blead/lib/perl5/site_perl/5.21.2
     /home/khw/blead/lib/perl5/site_perl/5.21.1
     /home/khw/blead/lib/perl5/site_perl/5.20.0
     /home/khw/blead/lib/perl5/site_perl/5.19.12
     /home/khw/blead/lib/perl5/site_perl/5.19.11
     /home/khw/blead/lib/perl5/site_perl/5.19.10
     /home/khw/blead/lib/perl5/site_perl
     .

---
Environment for perl 5.21.4:
     HOME=/home/khw
     LANG=en_US.UTF-8
     LANGUAGE (unset)
     LD_LIBRARY_PATH (unset)
     LOGDIR (unset)
 
PATH=/home/khw/bin:/home/khw/perl5/perlbrew/bin:/home/khw/print/bin:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/usr/games:/usr/local/games:/home/khw/iands/www:/home/khw/cxoffice/bin
     PERL5OPT=-w
     PERL_BADLANG (unset)
     PERL_POD_PEDANTIC=1
     SHELL=/bin/ksh


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