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* [Bug tree-optimization/31152] New: -(x>y) generates wrong code
@ 2007-03-12 17:36 anton at mips dot complang dot tuwien dot ac dot at
2007-03-12 17:43 ` [Bug tree-optimization/31152] " anton at mips dot complang dot tuwien dot ac dot at
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: anton at mips dot complang dot tuwien dot ac dot at @ 2007-03-12 17:36 UTC (permalink / raw)
To: gcc-bugs
The actual gcc version is
gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
When compiled and run with this gcc version, using the command line
gcc -O xxx.c && a.out
the attached program outputs -1, whereas the correct output is 0. If
I use gcc 3.3.6 or leave away the -O flag, the program produces
correct output.
--
Summary: -(x>y) generates wrong code
Product: gcc
Version: 4.1.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: anton at mips dot complang dot tuwien dot ac dot at
GCC host triplet: arm-linux-gnu
GCC target triplet: arm-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
@ 2007-03-12 17:43 ` anton at mips dot complang dot tuwien dot ac dot at
2007-03-13 10:20 ` [Bug target/31152] " rguenth at gcc dot gnu dot org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: anton at mips dot complang dot tuwien dot ac dot at @ 2007-03-12 17:43 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from anton at mips dot complang dot tuwien dot ac dot at 2007-03-12 17:43 -------
Subject: Re: New: -(x>y) generates wrong code
I cannot create an attachment in Bugzilla, so I'll just append the
test program here:
#include <stdio.h>
#include <limits.h>
long foo(long x, long y);
int main()
{
printf("%d\n",foo(INT_MIN,INT_MAX));
return 0;
}
long foo(long x, long y)
{
return -(x>y);
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
2007-03-12 17:43 ` [Bug tree-optimization/31152] " anton at mips dot complang dot tuwien dot ac dot at
@ 2007-03-13 10:20 ` rguenth at gcc dot gnu dot org
2007-03-23 21:28 ` fb at frank-buss dot de
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-03-13 10:20 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from rguenth at gcc dot gnu dot org 2007-03-13 10:20 -------
It works for me on x86_64 and i686 with 4.0.0, 4.1.0 and 4.1.2. So this looks
like a target issue.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|tree-optimization |target
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
2007-03-12 17:43 ` [Bug tree-optimization/31152] " anton at mips dot complang dot tuwien dot ac dot at
2007-03-13 10:20 ` [Bug target/31152] " rguenth at gcc dot gnu dot org
@ 2007-03-23 21:28 ` fb at frank-buss dot de
2007-06-19 9:41 ` rearnsha at gcc dot gnu dot org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: fb at frank-buss dot de @ 2007-03-23 21:28 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from fb at frank-buss dot de 2007-03-23 21:27 -------
I can reproduce the problem on a Linkstation Pro with an ARM926EJ CPU. I
compiled GCC SVN revision 123155 from the gcc-4_2-branch on it. Creating wrong
assembler code is at least a major bug, even when using the optimizing switch
(which many programs do), so please change severity to "major".
--
fb at frank-buss dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fb at frank-buss dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
` (2 preceding siblings ...)
2007-03-23 21:28 ` fb at frank-buss dot de
@ 2007-06-19 9:41 ` rearnsha at gcc dot gnu dot org
2007-06-23 18:07 ` rearnsha at gcc dot gnu dot org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rearnsha at gcc dot gnu dot org @ 2007-06-19 9:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rearnsha at gcc dot gnu dot org 2007-06-19 09:41 -------
Confirmed. This is a bug in the negscc pattern in arm.md. It's only been
there since 1994!
--
rearnsha at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-06-19 09:41:02
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
` (3 preceding siblings ...)
2007-06-19 9:41 ` rearnsha at gcc dot gnu dot org
@ 2007-06-23 18:07 ` rearnsha at gcc dot gnu dot org
2007-06-23 18:11 ` rearnsha at gcc dot gnu dot org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rearnsha at gcc dot gnu dot org @ 2007-06-23 18:07 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from rearnsha at gcc dot gnu dot org 2007-06-23 18:07 -------
Subject: Bug 31152
Author: rearnsha
Date: Sat Jun 23 18:07:04 2007
New Revision: 125973
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125973
Log:
PR target/31152
* arm.md (negscc): Match the correct operand for optimized LT0 test.
Remove optimization for GT.
*gcc.c-torture/execute/20070623-1.c: New.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/20070623-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/arm/arm.md
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
` (4 preceding siblings ...)
2007-06-23 18:07 ` rearnsha at gcc dot gnu dot org
@ 2007-06-23 18:11 ` rearnsha at gcc dot gnu dot org
2007-06-23 19:07 ` tbm at cyrius dot com
2007-06-23 19:08 ` tbm at cyrius dot com
7 siblings, 0 replies; 9+ messages in thread
From: rearnsha at gcc dot gnu dot org @ 2007-06-23 18:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from rearnsha at gcc dot gnu dot org 2007-06-23 18:11 -------
Fixed on trunk.
--
rearnsha at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.3.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
` (5 preceding siblings ...)
2007-06-23 18:11 ` rearnsha at gcc dot gnu dot org
@ 2007-06-23 19:07 ` tbm at cyrius dot com
2007-06-23 19:08 ` tbm at cyrius dot com
7 siblings, 0 replies; 9+ messages in thread
From: tbm at cyrius dot com @ 2007-06-23 19:07 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from tbm at cyrius dot com 2007-06-23 19:07 -------
Are you not going to apply this to 4.1 and 4.2?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/31152] -(x>y) generates wrong code
2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
` (6 preceding siblings ...)
2007-06-23 19:07 ` tbm at cyrius dot com
@ 2007-06-23 19:08 ` tbm at cyrius dot com
7 siblings, 0 replies; 9+ messages in thread
From: tbm at cyrius dot com @ 2007-06-23 19:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from tbm at cyrius dot com 2007-06-23 19:07 -------
Richard, I think this patch should also be added to the 4.1 and 4.2 branches.
--
tbm at cyrius dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rearnsha at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31152
^ permalink raw reply [flat|nested] 9+ messages in thread
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2007-03-12 17:36 [Bug tree-optimization/31152] New: -(x>y) generates wrong code anton at mips dot complang dot tuwien dot ac dot at
2007-03-12 17:43 ` [Bug tree-optimization/31152] " anton at mips dot complang dot tuwien dot ac dot at
2007-03-13 10:20 ` [Bug target/31152] " rguenth at gcc dot gnu dot org
2007-03-23 21:28 ` fb at frank-buss dot de
2007-06-19 9:41 ` rearnsha at gcc dot gnu dot org
2007-06-23 18:07 ` rearnsha at gcc dot gnu dot org
2007-06-23 18:11 ` rearnsha at gcc dot gnu dot org
2007-06-23 19:07 ` tbm at cyrius dot com
2007-06-23 19:08 ` tbm at cyrius dot com
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