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* c/9266: decrement pointer side effects are not working properly
@ 2003-01-10 21:16 randy
0 siblings, 0 replies; 4+ messages in thread
From: randy @ 2003-01-10 21:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 9266
>Category: c
>Synopsis: decrement pointer side effects are not working properly
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri Jan 10 13:16:01 PST 2003
>Closed-Date:
>Last-Modified:
>Originator: Randy Fields
>Release: gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
>Organization:
>Environment:
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --host=i386-redhat-linux --with-system-zlib
--enable-__cxa_atexit
Thread model: posix
gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
>Description:
The location of the the left hand side of the equation changes in the function call popST(). The compiler currently saves the incorrect location to write the return code to.
// offending code:
ST[STPTR] = popST();
>How-To-Repeat:
I compiled this code under 2.96 and 3.2 and compared the assembly. The assembly code in 2.96 looks correct.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c/9266: decrement pointer side effects are not working properly
@ 2003-01-10 22:46 Neil Booth
0 siblings, 0 replies; 4+ messages in thread
From: Neil Booth @ 2003-01-10 22:46 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c/9266; it has been noted by GNATS.
>From neil@daikokuya.co.uk Mon Jan 13 00:52:43 2003
From: Neil Booth <neil@daikokuya.co.uk>
To: Randy Fields <randy@fieldshome.com>
Cc: bangerth@dealii.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: c/9266: decrement pointer side effects are not working properly
Date: Fri, 10 Jan 2003 22:37:19 +0000
Randy Fields wrote:-
> across many different platforms and compilers (MS VC++ 4,5,6,7, IRIX,
> earlier versions of gcc) for six years. This is the first time we have
You were lucky, and finally your luck ran out then. As optimizers and
compilers change, incorrect code is increasingly likely to be exposed.
Neil.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c/9266: decrement pointer side effects are not working properly
@ 2003-01-10 22:06 Randy Fields
0 siblings, 0 replies; 4+ messages in thread
From: Randy Fields @ 2003-01-10 22:06 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c/9266; it has been noted by GNATS.
>From randy@fieldshome.com Mon Jan 13 00:52:34 2003
From: Randy Fields <randy@fieldshome.com>
To: bangerth@dealii.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
nobody@gcc.gnu.org, randy@fieldshome.com, gcc-gnats@gcc.gnu.org
Cc:
Subject: Re: c/9266: decrement pointer side effects are not working properly
Date: Fri, 10 Jan 2003 14:57:53 -0700
Greetings, and thank you for your quick response. I see that depending
on the side effects of these types of statements (pointer decrement) is
not a good habit to be in, and will promptly change my own code so that
it works. However, this same code base has been running (and compiling)
across many different platforms and compilers (MS VC++ 4,5,6,7, IRIX,
earlier versions of gcc) for six years. This is the first time we have
encountered the problem. I'm not saying that what the other compilers
are doing is correct, only that someone there may want to look more
closely at it for compatability sake. I see several bugs on the list
that could potentially be caused by this very problem. I'll be glad to
provide assembler code dumps, or any assistence that I can, if needed.
Thanks,
Randy Fields
Artis LLC
Research Programmer
bangerth@dealii.org wrote:
>Synopsis: decrement pointer side effects are not working properly
>
>State-Changed-From-To: open->closed
>State-Changed-By: bangerth
>State-Changed-When: Fri Jan 10 13:28:13 2003
>State-Changed-Why:
> You're changing the same variable twice in the same statement,
> and the result depends on the order in which this happens.
> This invokes undefined behavior -- don't do this.
>
> W.
>
>http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9266
>
>
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c/9266: decrement pointer side effects are not working properly
@ 2003-01-10 21:28 bangerth
0 siblings, 0 replies; 4+ messages in thread
From: bangerth @ 2003-01-10 21:28 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, nobody, randy
Synopsis: decrement pointer side effects are not working properly
State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Fri Jan 10 13:28:13 2003
State-Changed-Why:
You're changing the same variable twice in the same statement,
and the result depends on the order in which this happens.
This invokes undefined behavior -- don't do this.
W.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9266
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2003-01-10 22:46 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2003-01-10 21:16 c/9266: decrement pointer side effects are not working properly randy
2003-01-10 21:28 bangerth
2003-01-10 22:06 Randy Fields
2003-01-10 22:46 Neil Booth
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