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* [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711
@ 2013-08-04 13:24 JuergenUrban at gmx dot de
2013-08-04 21:20 ` [Bug rtl-optimization/58079] " jbglaw@lug-owl.de
` (10 more replies)
0 siblings, 11 replies; 12+ messages in thread
From: JuergenUrban at gmx dot de @ 2013-08-04 13:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
Bug ID: 58079
Summary: internal compiler error: in do_SUBST, at combine.c:711
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: JuergenUrban at gmx dot de
Created attachment 30608
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30608&action=edit
dvd_demux.i created from dvd_demux.c
An internal compiler error in do_SUBST happens. The comment in the source code
above the gcc_assert() is: "Sanity check that we're replacing oldval with a
CONST_INT that is a valid sign-extension for the original mode.".
The error happens when compiling the DVB modules in linux-2.6.35.4 for
Playstation 2 (mips). I used GCC r201473 from SVN. The error is also in
r200155. I used mips64r5900el, but it doesn't seem to be related to this. This
also happens when changing the ABI or the CPU type (still mips). Not using the
parameters "-Os", "-mno-abicalls" or "-mlong-calls" fix the problem.
I tried to create a small test case, but changing the source code and keeping
the error is difficult. I stripped the source code as far as possible and
attached the preprocessor output.
mips64r5900el-linux-gnu-gcc (GCC) 4.9.0 20130804 (experimental)
I didn't changed the GCC source code, even if the following output contains the
word "patched" in the path.
The error happens when executing the following command:
LANG=C mips64r5900el-linux-gnu-gcc -march=r4000 -mtune=r4000 -Os -mabi=32 -G 0
-mno-abicalls -msoft-float -mlong-calls -c -o /tmp/test.o dvb_demux.i
dvb_demux.c: In function 'dvb_dmx_swfilter_packets':
dvb_demux.c:214:1: internal compiler error: in do_SUBST, at combine.c:711
}
^
0xbe60c4 do_SUBST
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:710
0xbf5db9 combine_simplify_rtx
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:5813
0xbf710f subst
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:5149
0xbf6eaf subst
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:5094
0xbf6eaf subst
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:5094
0xbf83c8 try_combine
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:3142
0xbfd4a0 combine_instructions
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:1368
0xbfd4a0 rest_of_handle_combine
/home/jur/Programmierung/ps2/linux/simple-toolchain/build21/gcc-svn-r201473-patched/gcc/combine.c:13826
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
@ 2013-08-04 21:20 ` jbglaw@lug-owl.de
2013-08-05 8:42 ` mikpe at it dot uu.se
` (9 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: jbglaw@lug-owl.de @ 2013-08-04 21:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
Jan-Benedict Glaw <jbglaw@lug-owl.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jbglaw@lug-owl.de
--- Comment #1 from Jan-Benedict Glaw <jbglaw@lug-owl.de> ---
Created attachment 30612
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30612&action=edit
Reduced it a bit.
Can be reproduced with r201473.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
2013-08-04 21:20 ` [Bug rtl-optimization/58079] " jbglaw@lug-owl.de
@ 2013-08-05 8:42 ` mikpe at it dot uu.se
2013-08-05 12:05 ` mikpe at it dot uu.se
` (8 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: mikpe at it dot uu.se @ 2013-08-05 8:42 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mikpe at it dot uu.se
--- Comment #2 from Mikael Pettersson <mikpe at it dot uu.se> ---
I can reproduce the ICE with 4.9 and 4.8 crosses to mips64-linux, but not with
4.7 or 4.6.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
2013-08-04 21:20 ` [Bug rtl-optimization/58079] " jbglaw@lug-owl.de
2013-08-05 8:42 ` mikpe at it dot uu.se
@ 2013-08-05 12:05 ` mikpe at it dot uu.se
2013-08-06 21:14 ` rsandifo at gcc dot gnu.org
` (7 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: mikpe at it dot uu.se @ 2013-08-05 12:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rdsandiford at googlemail dot com
--- Comment #3 from Mikael Pettersson <mikpe at it dot uu.se> ---
Started with Uros' PR54457 patch in r191928. I'm not sure if that patch was
wrong or if it exposed a problem in the mips backend. Cc:ing a MIPS maintainer
(Richard S.)
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (2 preceding siblings ...)
2013-08-05 12:05 ` mikpe at it dot uu.se
@ 2013-08-06 21:14 ` rsandifo at gcc dot gnu.org
2013-08-08 18:45 ` rsandifo at gcc dot gnu.org
` (6 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2013-08-06 21:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rsandifo at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org
--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
(In reply to Mikael Pettersson from comment #3)
> Started with Uros' PR54457 patch in r191928. I'm not sure if that patch was
> wrong or if it exposed a problem in the mips backend.
Looks like a latent combine bug that's being exposed by the better
subreg optimisation. simplify_comparison is legitimately widening
a QImode comparison to SImode (since the target doesn't support
QImode comparisons), but combine_simplify_rtx is then trying to substitute
these widened values in-place, which trips the sanity check in do_SUBST.
I'm about to post a patch for comments.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (3 preceding siblings ...)
2013-08-06 21:14 ` rsandifo at gcc dot gnu.org
@ 2013-08-08 18:45 ` rsandifo at gcc dot gnu.org
2013-08-08 18:49 ` rsandifo at gcc dot gnu.org
` (5 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2013-08-08 18:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
--- Comment #5 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Patch applied to trunk.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (4 preceding siblings ...)
2013-08-08 18:45 ` rsandifo at gcc dot gnu.org
@ 2013-08-08 18:49 ` rsandifo at gcc dot gnu.org
2013-09-14 20:12 ` danglin at gcc dot gnu.org
` (4 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2013-08-08 18:49 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
...which means I should close the thing.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (5 preceding siblings ...)
2013-08-08 18:49 ` rsandifo at gcc dot gnu.org
@ 2013-09-14 20:12 ` danglin at gcc dot gnu.org
2013-09-28 16:18 ` steve at sk2 dot org
` (3 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: danglin at gcc dot gnu.org @ 2013-09-14 20:12 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
John David Anglin <danglin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |danglin at gcc dot gnu.org
--- Comment #7 from John David Anglin <danglin at gcc dot gnu.org> ---
Richard, this bug is still present on the 4.8 branch. Could you
backport your patch?
Bug also breaks kernel builds on hppa-unknown-linux-gnu.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (6 preceding siblings ...)
2013-09-14 20:12 ` danglin at gcc dot gnu.org
@ 2013-09-28 16:18 ` steve at sk2 dot org
2013-10-28 16:04 ` ubizjak at gmail dot com
` (2 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: steve at sk2 dot org @ 2013-09-28 16:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
Stephen Kitt <steve at sk2 dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |steve at sk2 dot org
--- Comment #8 from Stephen Kitt <steve at sk2 dot org> ---
*** Bug 58558 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (7 preceding siblings ...)
2013-09-28 16:18 ` steve at sk2 dot org
@ 2013-10-28 16:04 ` ubizjak at gmail dot com
2013-10-29 15:44 ` [Bug rtl-optimization/58079] [4.8 Regression] " uros at gcc dot gnu.org
2013-10-29 16:06 ` ubizjak at gmail dot com
10 siblings, 0 replies; 12+ messages in thread
From: ubizjak at gmail dot com @ 2013-10-28 16:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mcree at orcon dot net.nz
--- Comment #9 from Uroš Bizjak <ubizjak at gmail dot com> ---
*** Bug 58892 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-432870-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 28 16:04:41 2013
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/58892] [4.8 Regression] ICE in combine.c when using -Os on alpha
Date: Mon, 28 Oct 2013 16:04:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58892
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
Duplicate of PR58079.
*** This bug has been marked as a duplicate of bug 58079 ***
>From gcc-bugs-return-432872-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 28 16:07:35 2013
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/58079] internal compiler error: in do_SUBST, at combine.c:711
Date: Mon, 28 Oct 2013 16:07:00 -0000
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #10 from Uroš Bizjak <ubizjak at gmail dot com> ---
This patch has to be backported to 4.8 branch, as confirmed by duplicate
failures on three different targets.
>From gcc-bugs-return-432873-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 28 16:09:36 2013
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/58079] [4.8 Regression] internal compiler error: in do_SUBST, at combine.c:711
Date: Mon, 28 Oct 2013 16:09:00 -0000
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|mips64r5900el-linux-gnu |mips64r5900el-linux-gnu,
| |hppa-unknown-linux-gnu,
| |alpha-linux-gnu
Target Milestone|--- |4.8.3
Summary|internal compiler error: in |[4.8 Regression] internal
|do_SUBST, at combine.c:711 |compiler error: in
| |do_SUBST, at combine.c:711
--- Comment #11 from Uroš Bizjak <ubizjak at gmail dot com> ---
Still regression on 4.8 branch.
>From gcc-bugs-return-432874-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 28 16:16:39 2013
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From: "kimwooyoung at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/58906] New: SELECT TYPE with CLASS IS generates ICE
Date: Mon, 28 Oct 2013 16:16:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX906
Bug ID: 58906
Summary: SELECT TYPE with CLASS IS generates ICE
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: kimwooyoung at gmail dot com
The code fragment causes gfortan to die with a seg fault.
Using 'TYPE IS' instead of 'CLASS IS' seems o.k.
MODULE mymod
TYPE base
CONTAINS
END TYPE base
TYPE, EXTENDS(base) :: child
CLASS(*), DIMENSION(:), POINTER :: arr
CONTAINS
END TYPE child
CONTAINS
SUBROUTINE f(r)
CLASS(base), INTENT(INOUT) :: r
SELECT TYPE ( r )
CLASS IS ( child )
!TYPE IS ( child )
SELECT TYPE( iarr=>r%arr )
TYPE IS ( INTEGER )
CALL func( iarr )
END SELECT
END SELECT
END SUBROUTINE f
END MODULE mymod
$ gfortran -c reprod2.F90
f951: internal compiler error: Segmentation fault
0x869cbf crash_signal
../../gcc-4.8.2/gcc/toplev.c:332
0x56a244 resolve_select_type
../../gcc-4.8.2/gcc/fortran/resolve.c:8367
0x56b7cc resolve_code
../../gcc-4.8.2/gcc/fortran/resolve.c:10379
0x56d24e resolve_codes
../../gcc-4.8.2/gcc/fortran/resolve.c:15047
0x55ddb2 gfc_resolve
../../gcc-4.8.2/gcc/fortran/resolve.c:15075
0x56b940 gfc_resolve
../../gcc-4.8.2/gcc/fortran/resolve.c:15066
0x56b940 resolve_block_construct
../../gcc-4.8.2/gcc/fortran/resolve.c:9367
0x56b940 resolve_code
../../gcc-4.8.2/gcc/fortran/resolve.c:10383
0x56a0fb gfc_resolve_blocks(gfc_code*, gfc_namespace*)
../../gcc-4.8.2/gcc/fortran/resolve.c:9449
0x56adf3 resolve_code
../../gcc-4.8.2/gcc/fortran/resolve.c:10193
0x56a0fb gfc_resolve_blocks(gfc_code*, gfc_namespace*)
../../gcc-4.8.2/gcc/fortran/resolve.c:9449
0x56ab1f resolve_select_type
../../gcc-4.8.2/gcc/fortran/resolve.c:8681
0x56b7cc resolve_code
../../gcc-4.8.2/gcc/fortran/resolve.c:10379
0x56d24e resolve_codes
../../gcc-4.8.2/gcc/fortran/resolve.c:15047
0x56d157 resolve_codes
../../gcc-4.8.2/gcc/fortran/resolve.c:15033
0x55ddb2 gfc_resolve
../../gcc-4.8.2/gcc/fortran/resolve.c:15075
0x552486 gfc_parse_file()
../../gcc-4.8.2/gcc/fortran/parse.c:4614
0x58e365 gfc_be_parse_file
../../gcc-4.8.2/gcc/fortran/f95-lang.c:189
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] [4.8 Regression] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (8 preceding siblings ...)
2013-10-28 16:04 ` ubizjak at gmail dot com
@ 2013-10-29 15:44 ` uros at gcc dot gnu.org
2013-10-29 16:06 ` ubizjak at gmail dot com
10 siblings, 0 replies; 12+ messages in thread
From: uros at gcc dot gnu.org @ 2013-10-29 15:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
--- Comment #12 from uros at gcc dot gnu.org ---
Author: uros
Date: Tue Oct 29 15:44:15 2013
New Revision: 204165
URL: http://gcc.gnu.org/viewcvs?rev=204165&root=gcc&view=rev
Log:
Backport from mainline
2013-08-08 Richard Sandiford <rdsandiford@googlemail.com>
PR rtl-optimization/58079
* combine.c (combine_simplify_rtx): Avoid using SUBST if
simplify_comparison has widened a comparison with an integer.
testsuite/ChangeLog:
Backport from mainline
2013-08-08 Richard Sandiford <rdsandiford@googlemail.com>
PR rtl-optimization/58079
* gcc.dg/torture/pr58079.c: New test.
Added:
branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/torture/pr58079.c
Modified:
branches/gcc-4_8-branch/gcc/ChangeLog
branches/gcc-4_8-branch/gcc/combine.c
branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug rtl-optimization/58079] [4.8 Regression] internal compiler error: in do_SUBST, at combine.c:711
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
` (9 preceding siblings ...)
2013-10-29 15:44 ` [Bug rtl-optimization/58079] [4.8 Regression] " uros at gcc dot gnu.org
@ 2013-10-29 16:06 ` ubizjak at gmail dot com
10 siblings, 0 replies; 12+ messages in thread
From: ubizjak at gmail dot com @ 2013-10-29 16:06 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58079
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #13 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed also for 4.8 branch.
>From gcc-bugs-return-432925-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 29 16:14:26 2013
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From: "cvs at cs dot utoronto.ca" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/58912] New: make_shared value initializes storage space even when not desired
Date: Tue, 29 Oct 2013 16:14:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX912
Bug ID: 58912
Summary: make_shared value initializes storage space even when
not desired
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: cvs at cs dot utoronto.ca
Simple example:
struct foo {
char buf[1024*1024*1024];
foo() {}
};
auto p = std::make_shared<foo>();
I've traced the problem to shared_ptr_base.h and tested the following patch
(against 4.7.2) to resolve the problem:
--- shared_ptr_base.h.orig 2013-10-29 11:52:02.212301477 -0400
+++ shared_ptr_base.h 2013-10-29 11:52:20.620300707 -0400
@@ -394,7 +394,7 @@
public:
template<typename... _Args>
_Sp_counted_ptr_inplace(_Alloc __a, _Args&&... __args)
- : _M_impl(__a), _M_storage()
+ : _M_impl(__a)
{
_M_impl._M_ptr = static_cast<_Tp*>(static_cast<void*>(&_M_storage));
// _GLIBCXX_RESOLVE_LIB_DEFECTS
The problem appears to be in versions as new as 4.8.2.
Is there a good reason why the storage space must be initialized?
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2013-10-29 16:06 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-08-04 13:24 [Bug c/58079] New: internal compiler error: in do_SUBST, at combine.c:711 JuergenUrban at gmx dot de
2013-08-04 21:20 ` [Bug rtl-optimization/58079] " jbglaw@lug-owl.de
2013-08-05 8:42 ` mikpe at it dot uu.se
2013-08-05 12:05 ` mikpe at it dot uu.se
2013-08-06 21:14 ` rsandifo at gcc dot gnu.org
2013-08-08 18:45 ` rsandifo at gcc dot gnu.org
2013-08-08 18:49 ` rsandifo at gcc dot gnu.org
2013-09-14 20:12 ` danglin at gcc dot gnu.org
2013-09-28 16:18 ` steve at sk2 dot org
2013-10-28 16:04 ` ubizjak at gmail dot com
2013-10-29 15:44 ` [Bug rtl-optimization/58079] [4.8 Regression] " uros at gcc dot gnu.org
2013-10-29 16:06 ` ubizjak at gmail dot com
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