From mboxrd@z Thu Jan  1 00:00:00 1970
From: jikes@cabbey.net
To: gcc-gnats@gcc.gnu.org
Cc: jikes-dev@www-124.ibm.com
Subject: c++/4305: optimizer ICE on seemingly unrelated code changes
Date: Tue, 11 Sep 2001 23:16:00 -0000
Message-id: <20010912060711.25743.qmail@sourceware.cygnus.com>
X-SW-Source: 2001-09/msg00245.html
List-Id: <gcc-prs.sourceware.org>

>Number:         4305
>Category:       c++
>Synopsis:       optimizer ICE on seemingly unrelated code changes
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 11 23:16:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Jikes project
>Release:        gcc version 2.95.3 20010315 (SuSE)
>Organization:
>Environment:
Stock SuSE 7.2 x86 install running on SMP Pentium II system, kernel updated to 2.4.9 preview kernel from SuSE. We have intermittent reports of the same failure from Cygwin users as well:
Fails: Win98, cygwin 1.3.2-1, gcc 2.95.3-5
Does not fail: WinNT, cygwin 1.3.1-1, gcc 2.95.3-4
>Description:
Seemingly unrelated changes commited to our cvs tree cause an internal compiler error as such:

g++ -v -save-temps -DHAVE_CONFIG_H -I. -I../../jikes/src -I.
 -g -O2 -c -o expr.o ../../jikes/src/expr.cpp
Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.3/specs
gcc version 2.95.3 20010315 (SuSE)
 /usr/lib/gcc-lib/i486-suse-linux/2.95.3/cpp0 -lang-c++ -v -I. -I../../jikes/src -I. -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 -D__cplusplus -D__ELF__ -Dunix -D__i386__ -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux -Asystem(posix) -D__EXCEPTIONS -D__OPTIMIZE__ -g -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di486 -D__i486 -D__i486__ -DHAVE_CONFIG_H ../../jikes/src/expr.cpp expr.ii
GNU CPP version 2.95.3 20010315 (SuSE) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 .
 ../../jikes/src
 .
 /usr/include/g++
 /usr/local/include
 /usr/lib/gcc-lib/i486-suse-linux/2.95.3/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/lib/gcc-lib/i486-suse-linux/2.95.3/../../../../i486-suse-linux/include
End of omitted list.
 /usr/lib/gcc-lib/i486-suse-linux/2.95.3/cc1plus expr.ii -quiet -dumpbase expr.cc -g -O2 -version -o expr.s
GNU C++ version 2.95.3 20010315 (SuSE) (i486-suse-linux) compiled by GNU C version 2.95.3 20010315 (SuSE).
In file included from ../../jikes/src/expr.cpp:14:
../../jikes/src/tuple.h: In method `void Tuple<Tuple<AstExpression *> >::AllocateMoreSpace()':
../../jikes/src/tuple.h:194:   instantiated from `Tuple<Tuple<AstExpression *> >::NextIndex()'
../../jikes/src/tuple.h:208:   instantiated from `Tuple<Tuple<AstExpression *> >::Next()'
../../jikes/src/semantic.h:186:   instantiated from here
../../jikes/src/tuple.h:94: Internal compiler error.
../../jikes/src/tuple.h:94: Please submit a full bug report.
../../jikes/src/tuple.h:94: See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.

Reducing the optimization to -O1 prevents the problem, similarly some additional commits which don't appear to be related to the point of failure also correct/bypass the failure.

cvs timestamps of relevance:
good : "sep 8 05:00:00 utc"
bad  : "sep 8 06:00:00 utc"
good : "sep 8 21:00:00 utc"
We've not found anything in the changes that seem to interact with the code that is failing.
>How-To-Repeat:
1. recreation from attached .ii:
cc1plus expr.ii -quiet -dumpbase expr.cc -g -O2 -version -o expr.s

2. recreation from sources:
full sources from cvs can be used to recreate this, but given the attached .ii file I doubt anyone will want to do that. If so either pull from cvs or ask for a tarball and we'll produce one.

cvs root :pserver:anoncvs@www-214.ibm.com:/usr/cvs/jikes
password: anoncvs
module: jikes
directions: checkout module, ./configure && make
>Fix:
use -O1 instead of -O2, or apply seemingly unrelated changes that either undo a set of previous changes or apply a new set. The second of these leaves open a possibility for this to reappear at any unexpected moment.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="expr.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="expr.ii"

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