[Bug optimization/11440] New: gcc-3.3.1 miscompiles c++ code with -O2, -fno-gcse cures it

["olh at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11440

           Summary: gcc-3.3.1 miscompiles c++ code with -O2, -fno-gcse cures
                    it
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: olh at suse dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-unknown-linux
  GCC host triplet: powerpc-unknown-linux
GCC target triplet: powerpc-unknown-linux

konqueror from KDE_3_1_BRANCH does not render http://www.spiegel.de/ correctly. 
the reason is a miscompilation in libkhtml.so.4.1.0, render_box.cpp is miscompiled. 
 
gcc-3.2.3 produces correct results, gcc-3.3.1 with -O1 as well, -O2 breaks it. 
adding -fno-gcse after -O2 produces correct code. 
 
g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I../../kimgio -I../../kio -I../../dcop -I../../kfile -I../../khtml -I../.. 
-I../../dcop -I../../libltdl -I../../kdecore -I../../kdeui -I../../kio -I../../kio/kio -I../../kio/kfile -I../.. 
-I/usr/qt/3/include -I/usr/X11R6/include -I/home/kdebeta/kde31-cvs/include 
-DQT_THREAD_SUPPORT -D_REENTRANT -Wnon-virtual-dtor -Wno-long-long -Wundef -Wall 
-pedantic -W -Wpointer-arith -Wwrite-strings -ansi -D_XOPEN_SOURCE=500 
-D_BSD_SOURCE -Wcast-align -Wconversion -O1 -O2 -fno-gcse -fsigned-char -g 
-fmessage-length=0 -fno-exceptions -fno-check-new -DQT_NO_TRANSLATION 
-DQT_CLEAN_NAMESPACE -DQT_NO_ASCII_CAST -DQT_NO_COMPAT -c 
render_box.cpp -MT render_box.lo -MD -MP -MF .deps/render_box.TPlo  -fPIC -DPIC -o  
.libs/render_box.o 
 
see attachment.