optimization/3172: ICE when compiling with -O3

optimization/3172: ICE when compiling with -O3

[reichelt]

>Number:         3172
>Category:       optimization
>Synopsis:       ICE when compiling with -O3
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 13 09:46:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Volker Reichelt
>Release:        gcc version 3.0 20010604 (prerelease)
>Organization:
>Environment:
i686-pc-linux-gnu (SuSE Linux 6.4, 7.1)
>Description:
Compiling the attachment with -O3 causes an ICE.
More specific: cc1plus crashes in gcc/loop.c, line 2554.
There seems to be some memory corruption since
the pointer loop in gcc/loop.c "loop" contains a
bogus value in this situation, which causes the segfault.

The problem can be seen with the snapshots 20010514,
20010528, 20010604. I could not reproduce the problem
with 20010611, but probably only because some other
memory area got corrupted.

The first part of the code is distilled from <string>.
But to provide a minimal example I threw most of the
code away and changed much of it, so it does not make
sense any more. However, it should be legal code.

I tried to provide an even smaller and less confusing
example, but the problem disappears when I try to
simplify the code. But on the other hand, the actual
8kB example is at least a little smaller than the
original 1.5MB ;-)

I hope you can track down the bug, since I am not
sure, whether the memory corruption is caused by
the optimization (so one should only be careful using -O3)
or by some other part of the compiler and is only
revealed by the optimization step in which case
this PR is more serious (and in the wrong category).
>How-To-Repeat:
g++ -O3 -c opt.cpp
or
cc1plus -quiet -O3 -o opt.s opt.cpp
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="opt.cpp"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="opt.cpp"

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bHNlIHsgeCgwKTsgeCgwKTsgeCgwKTsgfQp9Cg==

Re: optimization/3172: ICE when compiling with -O3

[rodrigc]

Synopsis: ICE when compiling with -O3

State-Changed-From-To: open->closed
State-Changed-By: rodrigc
State-Changed-When: Mon Aug 13 15:01:56 2001
State-Changed-Why:
    Fixed in gcc 3.0.1 (gcc version 3.0.1 20010813 (prerelease))

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3172&database=gcc