[Bug c++/39623] New: Optimizer changes return from htons(uint16)

[Bug c++/39623] New: Optimizer changes return from htons(uint16)

[strk at keybit dot net]

The bug is known to occur with the following versions:
 - gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC)
 - g++ (Ubuntu 4.3.2-2ubuntu11) 4.3.3 20090111 (prerelease) 

The symptom of the bug is that when you use -O2 htons(short) returns
'unsigned int' (32 bit) rather then the expected 16bit value.
With no optimization it returns the correct 16bit.

I'll attach a testcase.


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           Summary: Optimizer changes return from htons(uint16)
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: strk at keybit dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39623

[Bug c++/39623] Optimizer changes return from htons(uint16)

[strk at keybit dot net]

------- Comment #1 from strk at keybit dot net  2009-04-03 09:01 -------
Created an attachment (id=17581)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17581&action=view)
Testcase for optimizer bug


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39623

[Bug c++/39623] Optimizer changes return from htons(uint16)

[schwab at linux-m68k dot org]

------- Comment #2 from schwab at linux-m68k dot org  2009-04-03 09:22 -------
<arpa/inet.h> probably defines different versions of htons depending on
optimisation level.


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schwab at linux-m68k dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39623

[Bug c++/39623] Optimizer changes return from htons(uint16)

[strk at keybit dot net]

------- Comment #3 from strk at keybit dot net  2009-04-03 09:27 -------
You mean I should file a bug against libc ? Or that it's a non-bug ?
The htons() manual page states it'd return a short...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39623

[Bug c++/39623] Optimizer changes return from htons(uint16)

[sje at gcc dot gnu dot org]

------- Comment #4 from sje at gcc dot gnu dot org  2009-04-22 15:53 -------
Subject: Bug 39623

Author: sje
Date: Wed Apr 22 15:53:05 2009
New Revision: 146593

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=146593
Log:
        PR testsuite/39623
        * gcc.dg/vect/no-vfa-vect-43.c Fix vect_no_align check.


Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/vect/no-vfa-vect-43.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39623

[Bug c++/39623] Optimizer changes return from htons(uint16)

[sje at gcc dot gnu dot org]

------- Comment #5 from sje at gcc dot gnu dot org  2009-04-23 15:37 -------
Subject: Bug 39623

Author: sje
Date: Thu Apr 23 15:36:48 2009
New Revision: 146650

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=146650
Log:
        PR testsuite/39623
        * gcc.dg/vect/no-vfa-vect-57.c: XFAIL when vect_no_align.
        * gcc.dg/vect/no-vfa-vect-61.c: Ditto.

Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/vect/no-vfa-vect-57.c
    trunk/gcc/testsuite/gcc.dg/vect/no-vfa-vect-61.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39623