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* optimization/7909: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
@ 2002-09-13 6:46 ben
0 siblings, 0 replies; 3+ messages in thread
From: ben @ 2002-09-13 6:46 UTC (permalink / raw)
To: gcc-gnats
>Number: 7909
>Category: optimization
>Synopsis: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri Sep 13 06:46:02 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Ben
>Release: 3.2
>Organization:
>Environment:
Compiling native code for a ia64 box
>Description:
The code sample is a fairly ugly routine to convert pointers
into a hex string. The code compiles fine with all levels of
optimisation. However, with -O2 and above, gcc reports the
following warning messages:
/tmp/cc2HCufe.s: Assembler messages:
/tmp/cc2HCufe.s:133: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 14
/tmp/cc2HCufe.s:133: Warning: Only the first path encountering the conflict is reported
>How-To-Repeat:
Compile the code with -O2 or above. No other compile flags required.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: optimization/7909: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
@ 2002-09-14 22:36 tprinceusa
0 siblings, 0 replies; 3+ messages in thread
From: tprinceusa @ 2002-09-14 22:36 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR optimization/7909; it has been noted by GNATS.
From: "tprinceusa" <tprinceusa@netzero.net>
To: <ben@zeus.com>,
<gcc-gnats@gcc.gnu.org>
Cc:
Subject: Re: optimization/7909: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
Date: Sat, 14 Sep 2002 22:27:18 -0700
----- Original Message -----
From: <ben@zeus.com>
To: <gcc-gnats@gcc.gnu.org>
Sent: Friday, September 13, 2002 6:38 AM
Subject: optimization/7909: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
>
> >Number: 7909
> >Category: optimization
> >Synopsis: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
> >Confidential: no
> >Severity: non-critical
> >Priority: medium
> >Responsible: unassigned
> >State: open
> >Class: sw-bug
> >Submitter-Id: net
> >Arrival-Date: Fri Sep 13 06:46:02 PDT 2002
> >Closed-Date:
> >Last-Modified:
> >Originator: Ben
> >Release: 3.2
> >Organization:
> >Environment:
> Compiling native code for a ia64 box
> >Description:
> The code sample is a fairly ugly routine to convert pointers
> into a hex string. The code compiles fine with all levels of
> optimisation. However, with -O2 and above, gcc reports the
> following warning messages:
>
> /tmp/cc2HCufe.s: Assembler messages:
> /tmp/cc2HCufe.s:133: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is
14
I see such messages reported consistently in gcc testsuite, for fp-cmp5. In some cases, including this, the compiled code runs OK.
It is possible to provoke many more such problems, e.g. by use of -frename-registers -O2, some of which do involve broken code
generation. Do others simply suppress these warnings?
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: optimization/7909: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
@ 2002-10-06 19:46 rth
0 siblings, 0 replies; 3+ messages in thread
From: rth @ 2002-10-06 19:46 UTC (permalink / raw)
To: ben, gcc-bugs, gcc-prs, nobody
Synopsis: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above
State-Changed-From-To: open->closed
State-Changed-By: rth
State-Changed-When: Sun Oct 6 19:46:06 2002
State-Changed-Why:
Duplicate of 7908
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7909
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-09-13 6:46 optimization/7909: ia64 warning 'Use of 'mov' may violate WAW dependency' on -O2 and above ben
2002-09-14 22:36 tprinceusa
2002-10-06 19:46 rth
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