optimization/3446: a bug already seen in gcc 2.95.[12] now in gcc 3.0

[gp at iws dot it]

>Number:         3446
>Category:       optimization
>Synopsis:       a bug already seen in gcc 2.95.[12] now in gcc 3.0
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 27 10:06:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     gcc 3.0
>Release:        unknown-1.0
>Organization:
>Environment:
linux 2.4.5 ac 19 x86
>Description:
This is a bug I saw four or five months ago
related to gcc 2.95.2 (if I'm right). The attached program 
,which i found on a site describing the bug , if
compiled with no optimization or with -O gives
correct results. when compiled with -O2 thru -O6
outputs wrong data. Using It i tested Gcc 3.0.
And discovered it is broken ... aarggh! should I switch 
back to gcc 2.95.3 ?

Here's the gcc -v output

Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.0/specs
Configured with: ../configure --prefix=/usr --exec-prefix=/usr
Thread model: single
gcc version 3.0
>How-To-Repeat:
Compile and execute the attached program first 
using gcc -O gccbug.i -o gccbug -> ./gccbug -> correct
then gcc -O[2-6] -o gccbug -> ./gccbug -> wrong
>Fix:
I cannot figure out but you should already know since it was
fixed in gcc 2.95.3 ...
>Release-Note:
>Audit-Trail:
>Unformatted:
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