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* [Bug c/47228] New: likely improper segfault in generated code
@ 2011-01-25 23:05 LpSolit at netscape dot net
2011-01-26 0:17 ` [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop pinskia at gcc dot gnu.org
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: LpSolit at netscape dot net @ 2011-01-25 23:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
Summary: likely improper segfault in generated code
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: regehr@cs.utah.edu
CC: chenyang@cs.utah.edu
Host: i686-pc-linux-gnu
Target: i686-pc-linux-gnu
Build: i686-pc-linux-gnu
regehr@home:~/volatile/bugs/tmp343$ current-gcc -O1 small.c -o small
regehr@home:~/volatile/bugs/tmp343$ ./small
Segmentation fault
regehr@home:~/volatile/bugs/tmp343$ current-gcc -v
Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/mnt/z/z/compiler-install/gcc-r168608-install/libexec/gcc/i686-pc-linux-gnu/4.6.0/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/mnt/z/z/compiler-install/gcc-r168608-install
--program-prefix=r168608- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20110109 (experimental) (GCC)
regehr@home:~/volatile/bugs/tmp343$ cat small.c
struct S4
{
unsigned f0:24;
} __attribute__((__packed__));
struct S4 g_10 = {
6210831
};
struct S4 func_2 (int x)
{
struct S4 l_8[2] = {
{0}, {0}
};
g_10 = l_8[1];
for (; x<2; x++) {
struct S4 tmp = {
11936567
};
l_8[x] = tmp;
}
return g_10;
}
int main (void)
{
func_2 (0);
return 0;
}
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
@ 2011-01-26 0:17 ` pinskia at gcc dot gnu.org
2011-01-26 9:50 ` jakub at gcc dot gnu.org
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-01-26 0:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|i686-pc-linux-gnu |i?86-pc-linux-gnu
Status|UNCONFIRMED |NEW
Keywords| |wrong-code
Last reconfirmed| |2011.01.26 00:09:23
Component|c |tree-optimization
Host|i686-pc-linux-gnu |
Ever Confirmed|0 |1
Summary|likely improper segfault in |[4.6 Regression] wrong code
|generated code |with loop
Target Milestone|--- |4.6.0
Build|i686-pc-linux-gnu |
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-01-26 00:09:23 UTC ---
Confirmed, fails also with -O2 -fno-inline (or marking func_2 as
noinline/noclone).
This is rather weird, the correct code (at the tree level even) is produced
with -m64.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
2011-01-26 0:17 ` [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop pinskia at gcc dot gnu.org
2011-01-26 9:50 ` jakub at gcc dot gnu.org
@ 2011-01-26 9:50 ` jakub at gcc dot gnu.org
2011-01-26 9:53 ` jakub at gcc dot gnu.org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-01-26 9:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-01-26 07:19:27 UTC ---
foo:
subl $16, %esp
... ! no other esp modifications
movl $11936567, 10(%esp,%ecx) #, MEM[(struct S[2] *)D.1998_9]
overwrites part of the return value.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
2011-01-26 0:17 ` [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop pinskia at gcc dot gnu.org
@ 2011-01-26 9:50 ` jakub at gcc dot gnu.org
2011-01-26 9:50 ` jakub at gcc dot gnu.org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-01-26 9:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-01-26 07:58:28 UTC ---
Caused by http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=164136
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
` (2 preceding siblings ...)
2011-01-26 9:50 ` jakub at gcc dot gnu.org
@ 2011-01-26 9:53 ` jakub at gcc dot gnu.org
2011-01-26 19:58 ` jamborm at gcc dot gnu.org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-01-26 9:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
CC| |jamborm at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-01-26 08:28:31 UTC ---
Yeah, clearly SRA fault, as it replaces
b[x_1] = c;
where both lhs and rhs is correctly type S, i.e. 3 byte packed BLKmode
structure,
with MEM_REF store which is SImode 4 byte.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
` (3 preceding siblings ...)
2011-01-26 9:53 ` jakub at gcc dot gnu.org
@ 2011-01-26 19:58 ` jamborm at gcc dot gnu.org
2011-01-26 21:14 ` jamborm at gcc dot gnu.org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jamborm at gcc dot gnu.org @ 2011-01-26 19:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |jamborm at gcc dot gnu.org
|gnu.org |
--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> 2011-01-26 18:28:17 UTC ---
OK, let me have a look at it then...
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
` (4 preceding siblings ...)
2011-01-26 19:58 ` jamborm at gcc dot gnu.org
@ 2011-01-26 21:14 ` jamborm at gcc dot gnu.org
2011-01-27 14:10 ` jamborm at gcc dot gnu.org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jamborm at gcc dot gnu.org @ 2011-01-26 21:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
--- Comment #6 from Martin Jambor <jamborm at gcc dot gnu.org> 2011-01-26 20:28:37 UTC ---
Created attachment 23137
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23137
untested patch
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
` (5 preceding siblings ...)
2011-01-26 21:14 ` jamborm at gcc dot gnu.org
@ 2011-01-27 14:10 ` jamborm at gcc dot gnu.org
2011-01-27 14:26 ` jamborm at gcc dot gnu.org
2011-02-02 18:16 ` dnovillo at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: jamborm at gcc dot gnu.org @ 2011-01-27 14:10 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
--- Comment #7 from Martin Jambor <jamborm at gcc dot gnu.org> 2011-01-27 13:41:54 UTC ---
Author: jamborm
Date: Thu Jan 27 13:41:51 2011
New Revision: 169331
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=169331
Log:
2011-01-27 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/47228
* tree-sra.c (sra_modify_assign): Use build_ref_for_model instead of
build_ref_for_offset.
* testsuite/gcc.dg/torture/pr47228.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr47228.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-sra.c
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
` (6 preceding siblings ...)
2011-01-27 14:10 ` jamborm at gcc dot gnu.org
@ 2011-01-27 14:26 ` jamborm at gcc dot gnu.org
2011-02-02 18:16 ` dnovillo at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: jamborm at gcc dot gnu.org @ 2011-01-27 14:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #8 from Martin Jambor <jamborm at gcc dot gnu.org> 2011-01-27 13:42:22 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop
2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
` (7 preceding siblings ...)
2011-01-27 14:26 ` jamborm at gcc dot gnu.org
@ 2011-02-02 18:16 ` dnovillo at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: dnovillo at gcc dot gnu.org @ 2011-02-02 18:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47228
--- Comment #9 from Diego Novillo <dnovillo at gcc dot gnu.org> 2011-02-02 17:57:08 UTC ---
Author: dnovillo
Date: Wed Feb 2 17:57:01 2011
New Revision: 169648
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=169648
Log:
2011-01-27 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/47228
* tree-sra.c (sra_modify_assign): Use build_ref_for_model instead of
build_ref_for_offset.
* testsuite/gcc.dg/torture/pr47228.c: New test.
Added:
branches/google/integration/gcc/testsuite/gcc.dg/torture/pr47228.c
Modified:
branches/google/integration/gcc/ChangeLog
branches/google/integration/gcc/testsuite/ChangeLog
branches/google/integration/gcc/tree-sra.c
^ permalink raw reply [flat|nested] 10+ messages in thread
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2011-01-25 23:05 [Bug c/47228] New: likely improper segfault in generated code LpSolit at netscape dot net
2011-01-26 0:17 ` [Bug tree-optimization/47228] [4.6 Regression] wrong code with loop pinskia at gcc dot gnu.org
2011-01-26 9:50 ` jakub at gcc dot gnu.org
2011-01-26 9:50 ` jakub at gcc dot gnu.org
2011-01-26 9:53 ` jakub at gcc dot gnu.org
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