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* [Bug c/17860] New: Wrong generated code for loop with inlined function inside.
@ 2004-10-06 12:50 tal dot agmon at nsc dot com
2004-10-06 12:55 ` [Bug rtl-optimization/17860] " pinskia at gcc dot gnu dot org
` (16 more replies)
0 siblings, 17 replies; 18+ messages in thread
From: tal dot agmon at nsc dot com @ 2004-10-06 12:50 UTC (permalink / raw)
To: gcc-bugs
Compile the following code with: gcc -O3. The output should be
foo is: 0, i is: 1
Yet the output is:
foo is: 0, i is: 0
This is the source code:
#include <stdio.h>
int foo=100;
int f ()
{
foo = 0;
}
void main ()
{
int i;
for (i = 0; i < foo; i++)
{
f ();
}
printf("foo is: %d, i is: %d\n",foo,i);
}
--
Summary: Wrong generated code for loop with inlined function
inside.
Product: gcc
Version: 3.4.2
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tal dot agmon at nsc dot com
CC: gcc-bugs at gcc dot gnu dot org,paul dot woegerer at nsc
dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with inlined function inside.
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
@ 2004-10-06 12:55 ` pinskia at gcc dot gnu dot org
2004-10-06 13:07 ` pinskia at gcc dot gnu dot org
` (15 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-06 12:55 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-06 12:55 -------
Since this is not a regression closing as fixed for 4.0.0.
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|critical |normal
Status|UNCONFIRMED |RESOLVED
Component|c |rtl-optimization
Keywords| |wrong-code
Known to fail| |2.95.3 3.3.2 3.4.2 3.4.3
Known to work| |4.0.0
Resolution| |FIXED
Target Milestone|--- |4.0.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with inlined function inside.
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
2004-10-06 12:55 ` [Bug rtl-optimization/17860] " pinskia at gcc dot gnu dot org
@ 2004-10-06 13:07 ` pinskia at gcc dot gnu dot org
2004-10-06 13:15 ` rguenth at tat dot physik dot uni-tuebingen dot de
` (14 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-06 13:07 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-06 13:06 -------
*** Bug 17861 has been marked as a duplicate of this bug. ***
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at tat dot physik
| |dot uni-tuebingen dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with inlined function inside.
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
2004-10-06 12:55 ` [Bug rtl-optimization/17860] " pinskia at gcc dot gnu dot org
2004-10-06 13:07 ` pinskia at gcc dot gnu dot org
@ 2004-10-06 13:15 ` rguenth at tat dot physik dot uni-tuebingen dot de
2004-10-06 17:04 ` [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound bonzini at gcc dot gnu dot org
` (13 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: rguenth at tat dot physik dot uni-tuebingen dot de @ 2004-10-06 13:15 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rguenth at tat dot physik dot uni-tuebingen dot de 2004-10-06 13:15 -------
Proper testcase:
extern void abort();
int foo=100;
inline int f ()
{
foo = 0;
}
void main ()
{
int i;
for (i = 0; i < foo; i++)
f ();
if (i != 1)
abort();
}
Also the rtl-optimization bug may be latent on mainline, how do we know?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (2 preceding siblings ...)
2004-10-06 13:15 ` rguenth at tat dot physik dot uni-tuebingen dot de
@ 2004-10-06 17:04 ` bonzini at gcc dot gnu dot org
2004-10-06 17:05 ` bonzini at gcc dot gnu dot org
` (12 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: bonzini at gcc dot gnu dot org @ 2004-10-06 17:04 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bonzini at gcc dot gnu dot org 2004-10-06 17:04 -------
It is not fixed. You can mark it as WONTFIX, but it is not reasonable to mark
it as FIXED.
I tried looking at some dumps for this test case, which is even more severe:
extern void abort ();
int
main ()
{
int i;
int foo = 2;
for (i = 0; i < foo; i++)
foo = 0;
if (i != 1)
abort ();
}
If the alias1 pass, which cannot be disabled, wouldn't rewrite "i < foo" to "foo
> i", chances are the test case would still trigger. I'm preparing a patch to
provide -fno-tree-ssa again, hoping that this will make more 3.4 test cases fail
again with 4.0 (GIMPLE would change the input to the RTL optimzation passes a
lot, but hopefully CSE will make things saner again).
Reopening with a target milestone of 3.4.4.
Paolo
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |critical
Status|RESOLVED |UNCONFIRMED
Resolution|FIXED |
Summary|Wrong generated code for |Wrong generated code for
|loop with inlined function |loop with varying bound
|inside. |
Target Milestone|4.0.0 |3.4.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (3 preceding siblings ...)
2004-10-06 17:04 ` [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound bonzini at gcc dot gnu dot org
@ 2004-10-06 17:05 ` bonzini at gcc dot gnu dot org
2004-10-06 17:09 ` pinskia at gcc dot gnu dot org
` (11 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: bonzini at gcc dot gnu dot org @ 2004-10-06 17:05 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2004-10-06 17:05:07
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (4 preceding siblings ...)
2004-10-06 17:05 ` bonzini at gcc dot gnu dot org
@ 2004-10-06 17:09 ` pinskia at gcc dot gnu dot org
2004-10-06 17:18 ` reichelt at gcc dot gnu dot org
` (10 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-06 17:09 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-06 17:09 -------
Since this is not a regression we should not have the target milestone set, also the old loop invariant
moving is being removed the last time I heard.
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|critical |normal
Target Milestone|3.4.4 |---
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (5 preceding siblings ...)
2004-10-06 17:09 ` pinskia at gcc dot gnu dot org
@ 2004-10-06 17:18 ` reichelt at gcc dot gnu dot org
2004-10-06 17:26 ` reichelt at gcc dot gnu dot org
` (9 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: reichelt at gcc dot gnu dot org @ 2004-10-06 17:18 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From reichelt at gcc dot gnu dot org 2004-10-06 17:18 -------
The bug can be triggered by "-O -fstrength-reduce".
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |reichelt at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (6 preceding siblings ...)
2004-10-06 17:18 ` reichelt at gcc dot gnu dot org
@ 2004-10-06 17:26 ` reichelt at gcc dot gnu dot org
2004-10-06 17:37 ` pinskia at gcc dot gnu dot org
` (8 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: reichelt at gcc dot gnu dot org @ 2004-10-06 17:26 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From reichelt at gcc dot gnu dot org 2004-10-06 17:26 -------
And it disappears with "-O2 -fno-strength-reduce".
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (7 preceding siblings ...)
2004-10-06 17:26 ` reichelt at gcc dot gnu dot org
@ 2004-10-06 17:37 ` pinskia at gcc dot gnu dot org
2004-10-06 17:40 ` pinskia at gcc dot gnu dot org
` (7 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-06 17:37 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-06 17:37 -------
This is most likely related to PR 16052.
--
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |16052
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (8 preceding siblings ...)
2004-10-06 17:37 ` pinskia at gcc dot gnu dot org
@ 2004-10-06 17:40 ` pinskia at gcc dot gnu dot org
2004-10-07 10:06 ` bonzini at gcc dot gnu dot org
` (6 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-06 17:40 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-06 17:40 -------
But more related to PR 13299.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (9 preceding siblings ...)
2004-10-06 17:40 ` pinskia at gcc dot gnu dot org
@ 2004-10-07 10:06 ` bonzini at gcc dot gnu dot org
2004-10-07 10:18 ` rguenth at tat dot physik dot uni-tuebingen dot de
` (5 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: bonzini at gcc dot gnu dot org @ 2004-10-07 10:06 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bonzini at gcc dot gnu dot org 2004-10-07 10:05 -------
Discussion and patch
http://gcc.gnu.org/ml/gcc-patches/2004-10/msg00622.html
A transformation check_dbra_loop that is causing the miscompilation because it
uses a != test; not related to 16052 which is about signedness.
Also not related to loop invariant motion. The source is a bogus
NOTE_INSN_LOOP_VTOP note: after CSE and GCSE's constant propagation, the loop
is not anymore a duplicate of the loop-entry test:
if (i < 2)
do
foo = 0, i++;
while (i < 0);
is not reducible to a while loop, while loop thinks it is because the VTOP note
remains.
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |bonzini at gcc dot gnu dot
| |org
BugsThisDependsOn|16052 |
Status|NEW |ASSIGNED
Keywords| |patch
Last reconfirmed|2004-10-06 17:05:07 |2004-10-07 10:05:58
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (10 preceding siblings ...)
2004-10-07 10:06 ` bonzini at gcc dot gnu dot org
@ 2004-10-07 10:18 ` rguenth at tat dot physik dot uni-tuebingen dot de
2004-11-21 1:39 ` [Bug rtl-optimization/17860] [3.4 only] " pinskia at gcc dot gnu dot org
` (4 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: rguenth at tat dot physik dot uni-tuebingen dot de @ 2004-10-07 10:18 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rguenth at tat dot physik dot uni-tuebingen dot de 2004-10-07 10:18 -------
Subject: Re: Wrong generated code for loop with
varying bound
> Also not related to loop invariant motion. The source is a bogus
> NOTE_INSN_LOOP_VTOP note: after CSE and GCSE's constant propagation, the loop
> is not anymore a duplicate of the loop-entry test:
Yes, 06.cse is the first wrong dump for with -O, 04.jump looks sane.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] [3.4 only] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (11 preceding siblings ...)
2004-10-07 10:18 ` rguenth at tat dot physik dot uni-tuebingen dot de
@ 2004-11-21 1:39 ` pinskia at gcc dot gnu dot org
2005-02-10 18:39 ` bonzini at gcc dot gnu dot org
` (3 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-11-21 1:39 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-21 01:39 -------
The reason why I say this can never even happen on 4.0 is because the loop notes are not done until
after the "new" rtl-loop pass is done.
--
What |Removed |Added
----------------------------------------------------------------------------
Summary|Wrong generated code for |[3.4 only] Wrong generated
|loop with varying bound |code for loop with varying
| |bound
Target Milestone|--- |3.4.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] [3.4 only] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (12 preceding siblings ...)
2004-11-21 1:39 ` [Bug rtl-optimization/17860] [3.4 only] " pinskia at gcc dot gnu dot org
@ 2005-02-10 18:39 ` bonzini at gcc dot gnu dot org
2005-05-19 17:46 ` mmitchel at gcc dot gnu dot org
` (2 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: bonzini at gcc dot gnu dot org @ 2005-02-10 18:39 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bonzini at gcc dot gnu dot org 2005-02-10 12:51 -------
Oh, and VTOP notes were killed on mainline.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] [3.4 only] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (13 preceding siblings ...)
2005-02-10 18:39 ` bonzini at gcc dot gnu dot org
@ 2005-05-19 17:46 ` mmitchel at gcc dot gnu dot org
2005-08-09 8:23 ` bonzini at gcc dot gnu dot org
2005-08-09 8:23 ` cvs-commit at gcc dot gnu dot org
16 siblings, 0 replies; 18+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2005-05-19 17:46 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|3.4.4 |3.4.5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] [3.4 only] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (15 preceding siblings ...)
2005-08-09 8:23 ` bonzini at gcc dot gnu dot org
@ 2005-08-09 8:23 ` cvs-commit at gcc dot gnu dot org
16 siblings, 0 replies; 18+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-08-09 8:23 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bonzini at gcc dot gnu dot org 2005-08-09 08:23 -------
Patch committed.
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-08-09 08:23 -------
Subject: Bug 17860
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-3_4-branch
Changes by: bonzini@gcc.gnu.org 2005-08-09 08:22:55
Modified files:
gcc : ChangeLog loop.c
Log message:
2005-08-09 Paolo Bonzini <bonzini@gnu.org>
PR rtl-optimization/17860
* loop.c (check_dbra_loop): Do not try to use an end condition
like "i != 0" in the reversed loop.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=2.2326.2.906&r2=2.2326.2.907
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/loop.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.488.2.8&r2=1.488.2.9
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug rtl-optimization/17860] [3.4 only] Wrong generated code for loop with varying bound
2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
` (14 preceding siblings ...)
2005-05-19 17:46 ` mmitchel at gcc dot gnu dot org
@ 2005-08-09 8:23 ` bonzini at gcc dot gnu dot org
2005-08-09 8:23 ` cvs-commit at gcc dot gnu dot org
16 siblings, 0 replies; 18+ messages in thread
From: bonzini at gcc dot gnu dot org @ 2005-08-09 8:23 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bonzini at gcc dot gnu dot org 2005-08-09 08:23 -------
Patch committed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17860
^ permalink raw reply [flat|nested] 18+ messages in thread
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2004-10-06 12:50 [Bug c/17860] New: Wrong generated code for loop with inlined function inside tal dot agmon at nsc dot com
2004-10-06 12:55 ` [Bug rtl-optimization/17860] " pinskia at gcc dot gnu dot org
2004-10-06 13:07 ` pinskia at gcc dot gnu dot org
2004-10-06 13:15 ` rguenth at tat dot physik dot uni-tuebingen dot de
2004-10-06 17:04 ` [Bug rtl-optimization/17860] Wrong generated code for loop with varying bound bonzini at gcc dot gnu dot org
2004-10-06 17:05 ` bonzini at gcc dot gnu dot org
2004-10-06 17:09 ` pinskia at gcc dot gnu dot org
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2004-10-06 17:37 ` pinskia at gcc dot gnu dot org
2004-10-06 17:40 ` pinskia at gcc dot gnu dot org
2004-10-07 10:06 ` bonzini at gcc dot gnu dot org
2004-10-07 10:18 ` rguenth at tat dot physik dot uni-tuebingen dot de
2004-11-21 1:39 ` [Bug rtl-optimization/17860] [3.4 only] " pinskia at gcc dot gnu dot org
2005-02-10 18:39 ` bonzini at gcc dot gnu dot org
2005-05-19 17:46 ` mmitchel at gcc dot gnu dot org
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