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optimization/6139: C++ && -O3 && (quicksort.cc of Mesa/glu) == ICE (-O2 is fine)



>Number:         6139
>Category:       optimization
>Synopsis:       C++ && -O3 && (quicksort.cc of Mesa/glu) == ICE (-O2 is fine)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 02 15:46:02 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Ole André Vadla Ravnås <zole@jblinux.net>
>Release:        3.1 20020325 (prerelease)
>Organization:
>Environment:
System: Linux zole.jblinux.net 2.4.18 #1 Wed Mar 27 22:38:35 EST 2002 i686 unknown
Architecture: i686

host: i686-jb-linux-gnu
build: i686-jb-linux-gnu
target: i686-jb-linux-gnu
configured with: ../configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man --enable-shared --enable-threads=posix --enable-languages=c,c++,f77,gcov,java,objc,ksi --enable-long-long --enable-multilib --with-gnu-as --with-gnu-ld --with-system-zlib --with-slibdir=/lib --without-x i686-jb-linux
>Description:
Compiling quicksort.cc which resides in glu/libnurbs/nurbtess/ of the MesaLib / MesaDemos distribution, with -O3, yields an ICE. -O2, however, works just fine.

The gcc commandline is:

g++ -DHAVE_CONFIG_H -I. -I. -I../../.. -I../../include -I../../../include -O3 -march=i686 -mcpu=i686 -Wp,-MD,.deps/quicksort.pp -c quicksort.cc  -fPIC -DPIC -o quicksort.o

Including or excluding the march and mcpu options yield absolutely no difference.
>How-To-Repeat:
See attachment. Compile it with:
g++ -O3 -march=i686 -mcpu=i686 -c quicksort.ii  -fPIC -DPIC -o quicksort.o
>Fix:
Only a workaround; compile with -O2 instead of -O3.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/x-bzip2; name="quicksort.ii.bz2"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="quicksort.ii.bz2"

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