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* [Bug c/58941] New: MIPS: value modification on zero-length array optimized away
@ 2013-10-31 14:08 thomas.moschcau at web dot de
2013-11-04 14:16 ` [Bug middle-end/58941] [4.7/4.8/4.9 Regression] " rguenth at gcc dot gnu.org
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: thomas.moschcau at web dot de @ 2013-10-31 14:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
Bug ID: 58941
Summary: MIPS: value modification on zero-length array
optimized away
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: thomas.moschcau at web dot de
Created attachment 31122
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31122&action=edit
preprocessed example source file
Hello,
on mips32 with gcc4.6.3, I get unexpected results when writing to a buffer via
a pointer to a zero-sized array.
Below is an example to produce the error.
Find additional info from gcc further below.
Thanks, Thomas
#include <stdio.h>
#include <stdlib.h>
typedef struct {
int msgLength;
unsigned char data[1000];
} SMsg;
typedef struct {
int dummy;
int d[0]; // using d[] would fix it
} SData;
int condition = 3;
void checkData( SMsg* pMsg );
void runBug( void )
{
SMsg msg; // generic message
SData *pData = (SData*)(msg.data); // pointer to specific payload
unsigned int i = 0; // no bug with signed int
for ( i = 0; i < 1; i++ ) // bug does not appear without this loop
{
pData->d[i] = 0;
if(condition & 1)
{
pData->d[i] |= 0x55;
// d[0] is now 0x55
}
if(condition & 2)
{
pData->d[i] |= 0xaa;
// d[0] should now be 0xff but is 0xaa
}
}
checkData( &msg );
}
void checkData( SMsg* pMsg )
{
SData *pData = (SData*)(pMsg->data);
if (pData->d[0] != 0xff)
{
printf("ERROR d[0]=0x%x, but should be 0x%x|0x%x\n",
(unsigned int)pData->d[0], 0x55, 0xaa );
exit(255);
}
}
int main( void )
{
runBug();
return 0;
}
--------------------------------------------------------------
/tmp/tlc/usr/bin/mips-linux-gcc -v -fno-strict-aliasing -O2 -Wall -Wextra -g
-fwrapv -save-temps -o test_gccbug test.c
Using built-in specs.
COLLECT_GCC=/tmp/tlc/usr/bin/mips-linux-gcc
COLLECT_LTO_WRAPPER=/tmp/tlc/usr/bin/../libexec/gcc/mips-buildroot-linux-uclibc/4.6.3/lto-wrapper
Target: mips-buildroot-linux-uclibc
Configured with:
/vol/cm/perforce/workspace/tmoschca_luzifer_buildroot/bld_mips32/buildroot-2013.02/output/toolchain/gcc-4.6.3/configure
--prefix=/vol/cm/perforce/workspace/tmoschca_luzifer_buildroot/bld_mips32/buildroot-2013.02/output/host/usr
--build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=mips-buildroot-linux-uclibc --enable-languages=c,c++
--with-sysroot=/vol/cm/perforce/workspace/tmoschca_luzifer_buildroot/bld_mips32/buildroot-2013.02/output/host/usr/mips-buildroot-linux-uclibc/sysroot
--with-build-time-tools=/vol/cm/perforce/workspace/tmoschca_luzifer_buildroot/bld_mips32/buildroot-2013.02/output/host/usr/mips-buildroot-linux-uclibc/bin
--disable-__cxa_atexit --enable-target-optspace --disable-libgomp --with-gnu-ld
--disable-libssp --disable-multilib --enable-tls --enable-shared
--with-gmp=/vol/cm/perforce/workspace/tmoschca_luzifer_buildroot/bld_mips32/buildroot-2013.02/output/host/usr
--with-mpfr=/vol/cm/perforce/workspace/tmoschca_luzifer_buildroot/bld_mips32/buildroot-2013.02/output/host/usr
--with-mpc=/vol/cm/perforce/workspace/tmoschca_luzifer_buildroot/bld_mips32/buildroot-2013.02/output/host/usr
--disable-nls --enable-threads --disable-decimal-float --with-float=soft
--with-abi=32 --with-tune=mips32 --with-pkgversion='Buildroot 2013.02'
--with-bugurl=http://bugs.buildroot.net/
Thread model: posix
gcc version 4.6.3 (Buildroot 2013.02)
COLLECT_GCC_OPTIONS='-v' '-fno-strict-aliasing' '-O2' '-Wall' '-Wextra' '-g'
'-fwrapv' '-save-temps' '-o' 'test_gccbug' '-mtune=mips32' '-mabi=32'
'-msoft-float' '-mllsc' '-mno-synci' '-mno-shared'
/tmp/tlc/usr/bin/../libexec/gcc/mips-buildroot-linux-uclibc/4.6.3/cc1 -E
-quiet -v -iprefix
/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/ -isysroot
/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot test.c -mtune=mips32
-mabi=32 -msoft-float -mllsc -mno-synci -mno-shared -Wall -Wextra
-fno-strict-aliasing -fwrapv -g -fworking-directory -O2 -fpch-preprocess -o
test.i
ignoring duplicate directory
"/tmp/tlc/usr/bin/../lib/gcc/../../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/include"
ignoring nonexistent directory
"/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/usr/local/include"
ignoring duplicate directory
"/tmp/tlc/usr/bin/../lib/gcc/../../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/include-fixed"
ignoring duplicate directory
"/tmp/tlc/usr/bin/../lib/gcc/../../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/../../../../mips-buildroot-linux-uclibc/include"
#include "..." search starts here:
#include <...> search starts here:
/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/include
/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/include-fixed
/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/../../../../mips-buildroot-linux-uclibc/include
/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-fno-strict-aliasing' '-O2' '-Wall' '-Wextra' '-g'
'-fwrapv' '-save-temps' '-o' 'test_gccbug' '-mtune=mips32' '-mabi=32'
'-msoft-float' '-mllsc' '-mno-synci' '-mno-shared'
/tmp/tlc/usr/bin/../libexec/gcc/mips-buildroot-linux-uclibc/4.6.3/cc1
-fpreprocessed test.i -quiet -dumpbase test.c -mtune=mips32 -mabi=32
-msoft-float -mllsc -mno-synci -mno-shared -auxbase test -g -O2 -Wall -Wextra
-version -fno-strict-aliasing -fwrapv -o test.s
GNU C (Buildroot 2013.02) version 4.6.3 (mips-buildroot-linux-uclibc)
compiled by GNU C version 4.1.2 20080704 (Red Hat 4.1.2-52), GMP
version 5.1.0, MPFR version 3.1.1-p2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C (Buildroot 2013.02) version 4.6.3 (mips-buildroot-linux-uclibc)
compiled by GNU C version 4.1.2 20080704 (Red Hat 4.1.2-52), GMP
version 5.1.0, MPFR version 3.1.1-p2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 5822c094c058915fedc3c193375772d1
COLLECT_GCC_OPTIONS='-v' '-fno-strict-aliasing' '-O2' '-Wall' '-Wextra' '-g'
'-fwrapv' '-save-temps' '-o' 'test_gccbug' '-mtune=mips32' '-mabi=32'
'-msoft-float' '-mllsc' '-mno-synci' '-mno-shared'
/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/../../../../mips-buildroot-linux-uclibc/bin/as
-EB -O2 -g -no-mdebug -mabi=32 -mno-shared -mtune=mips32 -KPIC -o test.o test.s
COMPILER_PATH=/tmp/tlc/usr/bin/../libexec/gcc/mips-buildroot-linux-uclibc/4.6.3/:/tmp/tlc/usr/bin/../libexec/gcc/:/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/../../../../mips-buildroot-linux-uclibc/bin/
LIBRARY_PATH=/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/:/tmp/tlc/usr/bin/../lib/gcc/:/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/../../../../mips-buildroot-linux-uclibc/lib/:/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/lib/:/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-fno-strict-aliasing' '-O2' '-Wall' '-Wextra' '-g'
'-fwrapv' '-save-temps' '-o' 'test_gccbug' '-mtune=mips32' '-mabi=32'
'-msoft-float' '-mllsc' '-mno-synci' '-mno-shared'
/tmp/tlc/usr/bin/../libexec/gcc/mips-buildroot-linux-uclibc/4.6.3/collect2
--sysroot=/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot
--eh-frame-hdr -EB -dynamic-linker /lib/ld-uClibc.so.0 -o test_gccbug
/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/usr/lib/crt1.o
/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/usr/lib/crti.o
/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/crtbegin.o
-L/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3
-L/tmp/tlc/usr/bin/../lib/gcc
-L/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/../../../../mips-buildroot-linux-uclibc/lib
-L/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/lib
-L/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/usr/lib test.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/tmp/tlc/usr/bin/../lib/gcc/mips-buildroot-linux-uclibc/4.6.3/crtend.o
/tmp/tlc/usr/bin/../mips-buildroot-linux-uclibc/sysroot/usr/lib/crtn.o
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7/4.8/4.9 Regression] MIPS: value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
@ 2013-11-04 14:16 ` rguenth at gcc dot gnu.org
2013-11-05 13:26 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-04 14:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Known to work| |4.3.4
Keywords| |alias, wrong-code
Last reconfirmed| |2013-11-04
Component|c |middle-end
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
Summary|MIPS: value modification on |[4.7/4.8/4.9 Regression]
|zero-length array optimized |MIPS: value modification on
|away |zero-length array optimized
| |away
Target Milestone|--- |4.7.4
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed, mine.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7/4.8/4.9 Regression] MIPS: value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
2013-11-04 14:16 ` [Bug middle-end/58941] [4.7/4.8/4.9 Regression] " rguenth at gcc dot gnu.org
@ 2013-11-05 13:26 ` rguenth at gcc dot gnu.org
2013-11-05 13:27 ` [Bug middle-end/58941] [4.7/4.8 Regression] " rguenth at gcc dot gnu.org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-05 13:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Nov 5 13:24:13 2013
New Revision: 204391
URL: http://gcc.gnu.org/viewcvs?rev=204391&root=gcc&view=rev
Log:
2013-11-05 Richard Biener <rguenther@suse.de>
PR middle-end/58941
* tree-dfa.c (get_ref_base_and_extent): Merge common code
in MEM_REF and TARGET_MEM_REF handling. Make sure to
process trailing array detection before diving into the
view-converted object (and possibly apply some extra offset).
* gcc.dg/torture/pr58941.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr58941.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-dfa.c
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7/4.8 Regression] value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
2013-11-04 14:16 ` [Bug middle-end/58941] [4.7/4.8/4.9 Regression] " rguenth at gcc dot gnu.org
2013-11-05 13:26 ` rguenth at gcc dot gnu.org
@ 2013-11-05 13:27 ` rguenth at gcc dot gnu.org
2013-11-19 9:24 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-05 13:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |4.9.0
Summary|[4.7/4.8/4.9 Regression] |[4.7/4.8 Regression] value
|MIPS: value modification on |modification on zero-length
|zero-length array optimized |array optimized away
|away |
Known to fail| |4.7.3, 4.8.2
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7/4.8 Regression] value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
` (2 preceding siblings ...)
2013-11-05 13:27 ` [Bug middle-end/58941] [4.7/4.8 Regression] " rguenth at gcc dot gnu.org
@ 2013-11-19 9:24 ` rguenth at gcc dot gnu.org
2013-11-19 9:26 ` [Bug middle-end/58941] [4.7 " rguenth at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-19 9:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Nov 19 09:22:45 2013
New Revision: 205011
URL: http://gcc.gnu.org/viewcvs?rev=205011&root=gcc&view=rev
Log:
2013-11-19 Richard Biener <rguenther@suse.de>
Backport from mainline
2013-11-05 Richard Biener <rguenther@suse.de>
PR middle-end/58941
* tree-dfa.c (get_ref_base_and_extent): Merge common code
in MEM_REF and TARGET_MEM_REF handling. Make sure to
process trailing array detection before diving into the
view-converted object (and possibly apply some extra offset).
* gcc.dg/torture/pr58941.c: New testcase.
Added:
branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/torture/pr58941.c
Modified:
branches/gcc-4_8-branch/gcc/ChangeLog
branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
branches/gcc-4_8-branch/gcc/tree-dfa.c
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7 Regression] value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
` (3 preceding siblings ...)
2013-11-19 9:24 ` rguenth at gcc dot gnu.org
@ 2013-11-19 9:26 ` rguenth at gcc dot gnu.org
2013-11-27 8:25 ` thomas.moschcau at web dot de
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-19 9:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |4.8.3
Summary|[4.7/4.8 Regression] value |[4.7 Regression] value
|modification on zero-length |modification on zero-length
|array optimized away |array optimized away
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
And 4.8.3.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7 Regression] value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
` (4 preceding siblings ...)
2013-11-19 9:26 ` [Bug middle-end/58941] [4.7 " rguenth at gcc dot gnu.org
@ 2013-11-27 8:25 ` thomas.moschcau at web dot de
2014-03-18 10:59 ` rguenth at gcc dot gnu.org
2014-03-18 11:01 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: thomas.moschcau at web dot de @ 2013-11-27 8:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
--- Comment #6 from Thomas Moschcau <thomas.moschcau at web dot de> ---
(In reply to Richard Biener from comment #5)
> And 4.8.3.
Hello Richard,
will there also be a fix for gcc 4.6.x?
Kind Regards
Thomas
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7 Regression] value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
` (5 preceding siblings ...)
2013-11-27 8:25 ` thomas.moschcau at web dot de
@ 2014-03-18 10:59 ` rguenth at gcc dot gnu.org
2014-03-18 11:01 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-03-18 10:59 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Mar 18 10:58:22 2014
New Revision: 208640
URL: http://gcc.gnu.org/viewcvs?rev=208640&root=gcc&view=rev
Log:
2014-03-18 Richard Biener <rguenther@suse.de>
Backport from mainline
2013-11-05 Richard Biener <rguenther@suse.de>
PR middle-end/58941
* tree-dfa.c (get_ref_base_and_extent): Merge common code
in MEM_REF and TARGET_MEM_REF handling. Make sure to
process trailing array detection before diving into the
view-converted object (and possibly apply some extra offset).
* gcc.dg/torture/pr58941.c: New testcase.
2012-05-07 Eric Botcazou <ebotcazou@adacore.com>
* tree-dfa.c (get_ref_base_and_extent) <ARRAY_REF>: Do the offset
computation using the precision of the index type.
2012-05-31 Eric Botcazou <ebotcazou@adacore.com>
* tree-dfa.c (get_ref_base_and_extent): Compute the offset using
double ints throughout.
Added:
branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr58941.c
Modified:
branches/gcc-4_7-branch/gcc/ChangeLog
branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
branches/gcc-4_7-branch/gcc/tree-dfa.c
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/58941] [4.7 Regression] value modification on zero-length array optimized away
2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
` (6 preceding siblings ...)
2014-03-18 10:59 ` rguenth at gcc dot gnu.org
@ 2014-03-18 11:01 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-03-18 11:01 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58941
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 9+ messages in thread
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2013-10-31 14:08 [Bug c/58941] New: MIPS: value modification on zero-length array optimized away thomas.moschcau at web dot de
2013-11-04 14:16 ` [Bug middle-end/58941] [4.7/4.8/4.9 Regression] " rguenth at gcc dot gnu.org
2013-11-05 13:26 ` rguenth at gcc dot gnu.org
2013-11-05 13:27 ` [Bug middle-end/58941] [4.7/4.8 Regression] " rguenth at gcc dot gnu.org
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2013-11-27 8:25 ` thomas.moschcau at web dot de
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