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* Re: optimization/8412: Code generation problem with -march=k6
@ 2002-10-31 4:07 paolo
0 siblings, 0 replies; 3+ messages in thread
From: paolo @ 2002-10-31 4:07 UTC (permalink / raw)
To: alexander.puchmayr, gcc-bugs, gcc-prs, nobody
Synopsis: Code generation problem with -march=k6
State-Changed-From-To: open->closed
State-Changed-By: paolo
State-Changed-When: Thu Oct 31 04:07:05 2002
State-Changed-Why:
Cannot be reproduced with current 3.2.1 pre and 3.3 exp.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8412
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: optimization/8412: Code generation problem with -march=k6
@ 2003-01-28 7:06 Jim Bray
0 siblings, 0 replies; 3+ messages in thread
From: Jim Bray @ 2003-01-28 7:06 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR optimization/8412; it has been noted by GNATS.
From: Jim Bray <jb@as220.org>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-prs@gcc.gnu.org, alexander.puchmayr@jku.at
Cc:
Subject: Re: optimization/8412: Code generation problem with -march=k6
Date: 28 Jan 2003 01:59:40 -0500
I think I'm seeing this same bug, with
gcc version 3.2.1 20021207 (Gentoo Linux 3.2.1-20021207)
I've noticed considerable instability with multimedia things including
xine, and have been studying an easily reproducible problem with
xmms. I'd assumed it was 3dnow related, but testing has zeroed me in
on a combination of -funroll-all-loops and -O[23].
Here are my crude notes to date. Not yet a good bug-report,
The test is compiling and running xmms and doing a particular
operation with it. My system is a k6-2.
-finline-functions is used in all tests.
CFLAGS='-march=k6-2 -g -O1' works.
CFLAGS='-march=k6-2 -g -O1 -ffast-math' works.
CFLAGS='-march=k6-2 -g -O1 -ffast-math -funroll-all-loops' works.
CFLAGS='-march=k6-2 -g -O2 -ffast-math -funroll-all-loops' FAILS.
CFLAGS='-march=k6-2 -g -O2 -ffast-math' works.
CFLAGS='-march=k6-2 -O2 -ffast-math' works.
The xmms configuration normally uses -funroll-all-loops, and
I was seeing consistent failure with any variant of -m{cpu,arch}=
{k6,k6-2} -O[23], which is not reflected above. The problem went
away when the k6-specific flags were removed. I did not start
getting any k6-specific build successes until I started dropping
below -O2 and -funroll-all-loops.
I did some studying of this with gdb, which seemed to be zeroing me
into an area of code which became an unrolled loop.
Bug I 'sent email to interested parties' from:
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8412
--
Jim Bray <jb@as220.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
* optimization/8412: Code generation problem with -march=k6
@ 2002-10-31 2:56 alexander.puchmayr
0 siblings, 0 replies; 3+ messages in thread
From: alexander.puchmayr @ 2002-10-31 2:56 UTC (permalink / raw)
To: gcc-gnats
>Number: 8412
>Category: optimization
>Synopsis: Code generation problem with -march=k6
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Thu Oct 31 02:56:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: alexander.puchmayr@jku.at
>Release: gcc version 3.2
>Organization:
>Environment:
i586
>Description:
The attached file (from xine-lib-0.9.13-r1), src/libfaad/syntax.i produces an ICE when compiling with -march=k6 and -funroll-loops. The file compiles fine with
-march=i586, athlon, athlon-xp, i686, pentium4, this it seems to be a k6 related problem.
Error-Message:
syntax.c: In function `section_data':
syntax.c:804: unrecognizable insn:
(insn 863 880 865 (set (reg:SI 280)
(zero_extend:SI (reg/v:QI 74))) -1 (nil)
(nil))
syntax.c:804: Internal compiler error in extract_insn, at recog.c:2148
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
>How-To-Repeat:
invoke gcc3-2 with:
gcc -march=k6 -O3 -funroll-loops -c syntax.i
>Fix:
Use i586 instead of k6
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2003-01-28 7:06 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2002-10-31 4:07 optimization/8412: Code generation problem with -march=k6 paolo
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2003-01-28 7:06 Jim Bray
2002-10-31 2:56 alexander.puchmayr
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