Re: c/5862: GCC generates invalid code in case of a combination of a bitwise AND and an incrementation

Re: c/5862: GCC generates invalid code in case of a combination of a bitwise AND and an incrementation

[neil]

Synopsis: GCC generates invalid code in case of a combination of a bitwise AND and an incrementation

State-Changed-From-To: feedback->closed
State-Changed-By: neil
State-Changed-When: Wed Mar 20 06:11:31 2002
State-Changed-Why:
    Undefined behaviour.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5862

Re: c/5862: GCC generates invalid code in case of a combination of a bitwise AND and an incrementation

[rodrigc]

Synopsis: GCC generates invalid code in case of a combination of a bitwise AND and an incrementation

State-Changed-From-To: open->feedback
State-Changed-By: rodrigc
State-Changed-When: Thu Mar  7 05:47:56 2002
State-Changed-Why:
    Cannot compile your testcase:
    /tmp/ccE1gg7O.o: In function `main':
    /tmp/ccE1gg7O.o(.text+0x11b): undefined reference to `__iob'
    collect2: ld returned 1 exit status
    
    What is this __iob?

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5862

c/5862: GCC generates invalid code in case of a combination of a bitwise AND and an incrementation

[mart]

>Number:         5862
>Category:       c
>Synopsis:       GCC generates invalid code in case of a combination of a bitwise AND and an incrementation
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 07 05:36:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     mart@netsoftlund.se
>Release:        gcc version 3.0.4
>Organization:
>Environment:
Sun Solaris 2.7 (SPARC) with recommended patches from Sun (march 2002).

Reading specs from /usr/local/lib/gcc-lib/sparc-sun-solaris2.7/3.0.4/specs
Configured with: ../configure 
Thread model: posix
gcc version 3.0.4
>Description:
When the attached program is compiled using Sun CC (version 4.2) and run it outputs:

30 81 88 80 05

But the gcc compiled program outputs:

8b 30 81 88 80 

Apparently the function ok1() does not work in the gcc case.
If the row:
   pdu += (0x7F & *pdu++);
is replaced by:
   pdu += (0x7F & *pdu) + 1;
the output from the CC- and gcc-generated programs are identical.
>How-To-Repeat:
Just run the program
>Fix:
When comparing the generated assembly code (CC <-> gcc) it looks like the gcc version calculates the AND product and
the incrementation (++) but overwrites these instead of adding them together.
Since we are no assembly wizards, this is merely a guess.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
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Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="decode.i"

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