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

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

[gp]

>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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cm4gKDEpOwp9Cg==

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

[rodrigc]

Synopsis: a bug already seen in gcc 2.95.[12] now in gcc 3.0

State-Changed-From-To: analyzed->closed
State-Changed-By: rodrigc
State-Changed-When: Sat Feb 23 19:05:50 2002
State-Changed-Why:
    Problem reproduced in gcc 3.0.4, but does not
    occur with gcc version 3.1 20020217 (experimental)

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3446

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

[rodrigc]

The following reply was made to PR optimization/3446; it has been noted by GNATS.

From: rodrigc@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
  gp@iws.it, nobody@gcc.gnu.org
Cc:  
Subject: Re: optimization/3446: a bug already seen in gcc 2.95.[12] now in gcc 3.0
Date: 19 Nov 2001 03:57:26 -0000

 Synopsis: a bug already seen in gcc 2.95.[12] now in gcc 3.0
 
 State-Changed-From-To: open->analyzed
 State-Changed-By: rodrigc
 State-Changed-When: Sun Nov 18 19:57:26 2001
 State-Changed-Why:
     I can reproduce your problem with
     gcc version 3.0.3 20011118 (prerelease).
     
     However, in gcc version 3.1 20011110 (experimental),
     the printf statements are always the same, no matter what
     optimization level is chosen.
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=3446&database=gcc

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

[rodrigc]

Synopsis: a bug already seen in gcc 2.95.[12] now in gcc 3.0

State-Changed-From-To: open->analyzed
State-Changed-By: rodrigc
State-Changed-When: Sun Nov 18 19:57:26 2001
State-Changed-Why:
    I can reproduce your problem with
    gcc version 3.0.3 20011118 (prerelease).
    
    However, in gcc version 3.1 20011110 (experimental),
    the printf statements are always the same, no matter what
    optimization level is chosen.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=3446&database=gcc