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* [Bug tree-optimization/39907] New: Aligned access to unaligned address
@ 2009-04-26 12:44 irar at il dot ibm dot com
2009-04-26 16:54 ` [Bug tree-optimization/39907] " rguenth at gcc dot gnu dot org
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: irar at il dot ibm dot com @ 2009-04-26 12:44 UTC (permalink / raw)
To: gcc-bugs
The following code (a reduced gcc.target/x86_64/abi/test_struct_returning.c)
fails during execution with segmentation fault when compiled with -O1
-ftree-vectorize -fno-vect-cost-model asm-support.S (in directory
gcc.target/x86_64/abi/):
#include <stdio.h>
#include "defines.h"
#include "macros.h"
#include "args.h"
struct S_600
{
float f[4];
};
struct S_600 f_600 ()
{
struct S_600 s;
int i;
for (i = 0; i < 4; i++)
s.f[i] = 42;
return s;
}
int
main (void)
{
struct S_600 s;
s = WRAP_RET(f_600) ();
return 0;
}
The failure occurs in
0x000000000040063b in f_600 ()
1: x/i $pc 0x40063b <f_600+7>: movaps %xmm0,0xffffffffffffffd8(%rsp)
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x000000000040063b in f_600 ()
1: x/i $pc 0x40063b <f_600+7>: movaps %xmm0,0xffffffffffffffd8(%rsp)
rsp 0x7fff408944c0 0x7fff408944c0
xmm0 {v4_float = {0x2a, 0x2a, 0x2a, 0x2a}, v2_double = {0xc00002114,
0xc00002114}, v16_int8 = {0x0, 0x0, 0x28,
0x42, 0x0, 0x0, 0x28, 0x42, 0x0, 0x0, 0x28, 0x42, 0x0, 0x0, 0x28, 0x42},
v8_int16 = {0x0, 0x4228, 0x0, 0x4228, 0x0,
0x4228, 0x0, 0x4228}, v4_int32 = {0x42280000, 0x42280000, 0x42280000,
0x42280000}, v2_int64 = {0x4228000042280000,
0x4228000042280000}, uint128 = 0x42280000422800004228000042280000}
The alignment is forced by the vectorizer in function
vect_compute_data_ref_alignment() the same way as in pass
pass_ipa_increase_alignment. But if 's' is global and not local in f_600 (i.e.,
when the alignment is forced in pass_ipa_increase_alignment) there is no
segfault.
I also tried to remove WRAP_RET(), and put f_600 and main in different files
(in order to prevent their elimination). But this way there was no segfault
either.
Another check: if the vectorizer forces alignment but also uses peeling (with
the help of a hack), there is still a segfault:
0x000000000040065f in f_600 ()
1: x/i $pc 0x40065f <f_600+43>: movaps 362(%rip),%xmm0 #
0x4007d0 <_IO_stdin_used+16>
(gdb)
1: x/i $pc 0x400666 <f_600+50>: movaps %xmm0,(%rdx)
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x0000000000400666 in f_600 ()
1: x/i $pc 0x400666 <f_600+50>: movaps %xmm0,(%rdx)
(gdb) info all-registers
rdx 0x7fff2a759358 140733905736536
rip 0x400666 0x400666 <f_600+50>
If after forcing the alignment, the vectorizer escapes and doesn't do anything
else, there is no segfault.
--
Summary: Aligned access to unaligned address
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: irar at il dot ibm dot com
GCC build triplet: x86_64-suse-linux
GCC host triplet: x86_64-suse-linux
GCC target triplet: x86_64-suse-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
@ 2009-04-26 16:54 ` rguenth at gcc dot gnu dot org
2009-04-27 5:56 ` irar at il dot ibm dot com
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-04-26 16:54 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2009-04-26 16:54 -------
*** Bug 39908 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
2009-04-26 16:54 ` [Bug tree-optimization/39907] " rguenth at gcc dot gnu dot org
@ 2009-04-27 5:56 ` irar at il dot ibm dot com
2009-05-18 10:04 ` rguenth at gcc dot gnu dot org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: irar at il dot ibm dot com @ 2009-04-27 5:56 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from irar at il dot ibm dot com 2009-04-27 05:55 -------
*** Bug 39926 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
2009-04-26 16:54 ` [Bug tree-optimization/39907] " rguenth at gcc dot gnu dot org
2009-04-27 5:56 ` irar at il dot ibm dot com
@ 2009-05-18 10:04 ` rguenth at gcc dot gnu dot org
2009-05-18 14:25 ` pinskia at gcc dot gnu dot org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-05-18 10:04 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from rguenth at gcc dot gnu dot org 2009-05-18 10:03 -------
The bug is that
snapshot_ret:
movq %rdi, rdi(%rip)
call *callthis(%rip)
does not preserve stack alignment. But we assume that correct alignment
is preserved over the indirect function call(?).
HJ?
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl at gcc dot gnu dot org
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-05-18 10:03:55
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
` (2 preceding siblings ...)
2009-05-18 10:04 ` rguenth at gcc dot gnu dot org
@ 2009-05-18 14:25 ` pinskia at gcc dot gnu dot org
2009-05-18 16:40 ` [Bug testsuite/39907] " hjl dot tools at gmail dot com
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-05-18 14:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pinskia at gcc dot gnu dot org 2009-05-18 14:25 -------
(In reply to comment #3)
> The bug is that
>
> snapshot_ret:
> movq %rdi, rdi(%rip)
> call *callthis(%rip)
>
> does not preserve stack alignment. But we assume that correct alignment
> is preserved over the indirect function call(?).
Are you sure that this is not an inline-asm?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug testsuite/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
` (3 preceding siblings ...)
2009-05-18 14:25 ` pinskia at gcc dot gnu dot org
@ 2009-05-18 16:40 ` hjl dot tools at gmail dot com
2009-05-18 16:53 ` hjl at gcc dot gnu dot org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: hjl dot tools at gmail dot com @ 2009-05-18 16:40 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from hjl dot tools at gmail dot com 2009-05-18 16:39 -------
A patch is posted at
http://gcc.gnu.org/ml/gcc-patches/2009-05/msg01156.html
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://gcc.gnu.org/ml/gcc-
| |patches/2009-
| |05/msg01156.html
Component|tree-optimization |testsuite
Keywords|wrong-code |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug testsuite/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
` (4 preceding siblings ...)
2009-05-18 16:40 ` [Bug testsuite/39907] " hjl dot tools at gmail dot com
@ 2009-05-18 16:53 ` hjl at gcc dot gnu dot org
2009-05-18 16:54 ` hjl at gcc dot gnu dot org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: hjl at gcc dot gnu dot org @ 2009-05-18 16:53 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from hjl at gcc dot gnu dot org 2009-05-18 16:53 -------
Subject: Bug 39907
Author: hjl
Date: Mon May 18 16:53:25 2009
New Revision: 147667
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=147667
Log:
2009-05-18 H.J. Lu <hongjiu.lu@intel.com>
PR testsuite/39907
* gcc.target/x86_64/abi/asm-support.S (snapshot_ret): Preserve
stack alignment.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/x86_64/abi/asm-support.S
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug testsuite/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
` (5 preceding siblings ...)
2009-05-18 16:53 ` hjl at gcc dot gnu dot org
@ 2009-05-18 16:54 ` hjl at gcc dot gnu dot org
2009-05-18 16:57 ` hjl at gcc dot gnu dot org
2009-05-18 16:58 ` hjl dot tools at gmail dot com
8 siblings, 0 replies; 10+ messages in thread
From: hjl at gcc dot gnu dot org @ 2009-05-18 16:54 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from hjl at gcc dot gnu dot org 2009-05-18 16:54 -------
Subject: Bug 39907
Author: hjl
Date: Mon May 18 16:54:31 2009
New Revision: 147668
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=147668
Log:
2009-05-18 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline:
2009-05-18 H.J. Lu <hongjiu.lu@intel.com>
PR testsuite/39907
* gcc.target/x86_64/abi/asm-support.S (snapshot_ret): Preserve
stack alignment.
Modified:
branches/gcc-4_4-branch/gcc/testsuite/ChangeLog
branches/gcc-4_4-branch/gcc/testsuite/gcc.target/x86_64/abi/asm-support.S
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug testsuite/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
` (6 preceding siblings ...)
2009-05-18 16:54 ` hjl at gcc dot gnu dot org
@ 2009-05-18 16:57 ` hjl at gcc dot gnu dot org
2009-05-18 16:58 ` hjl dot tools at gmail dot com
8 siblings, 0 replies; 10+ messages in thread
From: hjl at gcc dot gnu dot org @ 2009-05-18 16:57 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from hjl at gcc dot gnu dot org 2009-05-18 16:56 -------
Subject: Bug 39907
Author: hjl
Date: Mon May 18 16:56:42 2009
New Revision: 147669
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=147669
Log:
2009-05-18 H.J. Lu <hongjiu.lu@intel.com>
PR testsuite/39907
* gcc.target/x86_64/abi/asm-support.s (snapshot_ret): Preserve
stack alignment.
Modified:
branches/gcc-4_3-branch/gcc/testsuite/ChangeLog
branches/gcc-4_3-branch/gcc/testsuite/gcc.target/x86_64/abi/asm-support.s
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug testsuite/39907] Aligned access to unaligned address
2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
` (7 preceding siblings ...)
2009-05-18 16:57 ` hjl at gcc dot gnu dot org
@ 2009-05-18 16:58 ` hjl dot tools at gmail dot com
8 siblings, 0 replies; 10+ messages in thread
From: hjl dot tools at gmail dot com @ 2009-05-18 16:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from hjl dot tools at gmail dot com 2009-05-18 16:58 -------
Fixed.
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.3.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39907
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2009-04-26 12:44 [Bug tree-optimization/39907] New: Aligned access to unaligned address irar at il dot ibm dot com
2009-04-26 16:54 ` [Bug tree-optimization/39907] " rguenth at gcc dot gnu dot org
2009-04-27 5:56 ` irar at il dot ibm dot com
2009-05-18 10:04 ` rguenth at gcc dot gnu dot org
2009-05-18 14:25 ` pinskia at gcc dot gnu dot org
2009-05-18 16:40 ` [Bug testsuite/39907] " hjl dot tools at gmail dot com
2009-05-18 16:53 ` hjl at gcc dot gnu dot org
2009-05-18 16:54 ` hjl at gcc dot gnu dot org
2009-05-18 16:57 ` hjl at gcc dot gnu dot org
2009-05-18 16:58 ` hjl dot tools at gmail dot com
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