[Bug optimization/12287] New: Assembler warnings when building with -O2

[Bug optimization/12287] New: Assembler warnings when building with -O2

[d92-jwa at nada dot kth dot se]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12287

           Summary: Assembler warnings when building with -O2
           Product: gcc
           Version: 3.2.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: d92-jwa at nada dot kth dot se
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: ia64-unknown-linux-gnu
  GCC host triplet: ia64-unknown-linux-gnu
GCC target triplet: ia64-unknown-linux-gnu

Reproduce thusly:
Build the program I'm about to attach with "gcc -O2 -c list.minimized.c".

Expected results:
The program should have built without warnings.

Actual results:
/tmp/ccBcMxH5.s: Assembler messages:
/tmp/ccBcMxH5.s:72: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in
1 - 127' (impliedf), specific resource number is 14
/tmp/ccBcMxH5.s:70: Warning: This is the location of the conflicting usage
/tmp/ccBcMxH5.s:74: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in
1 - 127' (impliedf), specific resource number is 15
/tmp/ccBcMxH5.s:73: Warning: This is the location of the conflicting usage

[Bug optimization/12287] Assembler warnings when building with -O2

[d92-jwa at nada dot kth dot se]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12287



------- Additional Comments From d92-jwa at nada dot kth dot se  2003-09-15 15:23 -------
Created an attachment (id=4762)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=4762&action=view)
Preprocessed reproducer source code

[Bug optimization/12287] Assembler warnings when building with -O2

[d92-jwa at nada dot kth dot se]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12287



------- Additional Comments From d92-jwa at nada dot kth dot se  2003-09-15 15:24 -------
The assembler is "GNU assembler 2.14 20030612".

[Bug optimization/12287] Assembler warnings when building with -O2

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12287


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-10-05 17:09 -------
3.2.3 is an old release, can you try 3.3.1?

[Bug optimization/12287] Assembler warnings when building with -O2

[d92-jwa at nada dot kth dot se]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12287


d92-jwa at nada dot kth dot se changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
     Ever Confirmed|                            |1
            Version|3.2.3                       |3.3.1


------- Additional Comments From d92-jwa at nada dot kth dot se  2003-10-06 09:40 -------
Yes, this problem is present on 3.3.1 as well.

Weren't you able to reproduce it using the attached test program?

[Bug optimization/12287] Assembler warnings when building with -O2

[jbarnes at sgi dot com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12287


jbarnes at sgi dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jbarnes at sgi dot com


------- Additional Comments From jbarnes at sgi dot com  2003-10-15 22:20 -------
I see this problem as well, with gcc 3.3.1 and binutils 2.14.90.0.6: 
[jbarnes@tomahawk linux-2.5-bigsur]$ $CROSS_COMPILE/gcc --version 
gcc (GCC) 3.3.1 
[jbarnes@tomahawk linux-2.5-bigsur]$ $CROSS_COMPILE/ld --version 
GNU ld version 2.14.90.0.6 20030820 
 
I always see a number of these 'dependency violation' messages when I compile 
an ia64 Linux kernel.  For example: 
 
  ... 
  LD      fs/lockd/built-in.o 
{standard input}: Assembler messages: 
{standard input}:4421: Warning: Use of 'ssm' violates WAW dependency 'PSR.i' 
(impliedf) 
{standard input}:4421: Warning: Only the first path encountering the conflict 
is reported 
{standard input}:4414: Warning: This is the location of the conflicting usage 
{standard input}:4492: Warning: Use of 'ssm' violates WAW dependency 'PSR.i' 
(impliedf) 
{standard input}:4492: Warning: Only the first path encountering the conflict 
is reported 
{standard input}:4485: Warning: This is the location of the conflicting usage 
  CC      fs/nfs/dir.o 
  .... 
 
Thanks, 
Jesse

[Bug optimization/12287] Assembler warnings when building with -O2

[hjl at lucon dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12287


hjl at lucon dot org changed:

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


------- Additional Comments From hjl at lucon dot org  2003-10-15 23:54 -------
It is an assembler bug. I hope to fix it soon. See

http://sources.redhat.com/ml/binutils/2003-10/msg00005.html