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* Re: optimization/2091: SPARC follow-up to 2072 -- illustrative example
@ 2002-04-01 22:47 rth
0 siblings, 0 replies; 2+ messages in thread
From: rth @ 2002-04-01 22:47 UTC (permalink / raw)
To: eljay, gcc-bugs, gcc-prs, nobody
Synopsis: SPARC follow-up to 2072 -- illustrative example
State-Changed-From-To: open->closed
State-Changed-By: rth
State-Changed-When: Mon Apr 1 22:47:34 2002
State-Changed-Why:
Fixed for gcc 3.1.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=2091
^ permalink raw reply [flat|nested] 2+ messages in thread
* optimization/2091: SPARC follow-up to 2072 -- illustrative example
@ 2001-04-01 0:00 eljay
0 siblings, 0 replies; 2+ messages in thread
From: eljay @ 2001-04-01 0:00 UTC (permalink / raw)
To: gcc-gnats
>Number: 2091
>Category: optimization
>Synopsis: SPARC follow-up to 2072 -- illustrative example
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Sun Feb 25 13:26:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: John Love-Jensen
>Release: unknown-1.0
>Organization:
>Environment:
Solaris 2.6, 7, 8 and GCC 2.95.2
>Description:
After digging around some more, it seems that there is an
optimization bug.
I've attached a tar file with a short code snippet, and
the -O2 output .s and -O3 output .s.
The bug in ProblemRoutine becomes very apparent in the
-O3 optimized assembly. Notice that %l7 is used before
initialization. (!)
This should help immensely to track down the underlying
issue. (The PMMU theory is still sound -- I think --
but that's the symptom and the result of broken code,
not the cause.)
>How-To-Repeat:
The broken code generates everytime. Usually %l7 is set
correctly, so it SEGVs infrequently in Real Life.
>Fix:
Easiest fix is to use -O2.
(If the 11,776 byte tar file doesn't make it, contact me
and I'll send it as an attachment.)
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/x-tar; name="gnat2072.tar"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="gnat2072.tar"
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^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2002-04-02 6:47 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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