* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
@ 2014-08-04 10:55 ` redi at gcc dot gnu.org
2014-08-04 11:24 ` rguenth at gcc dot gnu.org
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2014-08-04 10:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-08-04
Component|c++ |tree-optimization
Version|unknown |4.9.1
Ever confirmed|0 |1
Known to fail| |4.10.0, 4.8.2, 4.9.1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. compile with -std=c++11
I can't tell whether it's a regression without rewriting some of the code to
avoid features that aren't supported prior to 4.8
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
2014-08-04 10:55 ` [Bug tree-optimization/62006] " redi at gcc dot gnu.org
@ 2014-08-04 11:24 ` rguenth at gcc dot gnu.org
2014-08-04 12:00 ` rguenth at gcc dot gnu.org
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-08-04 11:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
There is only a single extra PRE performed by partial-PRE. I'll have a look.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
2014-08-04 10:55 ` [Bug tree-optimization/62006] " redi at gcc dot gnu.org
2014-08-04 11:24 ` rguenth at gcc dot gnu.org
@ 2014-08-04 12:00 ` rguenth at gcc dot gnu.org
2014-08-04 12:05 ` tkoeppe at google dot com
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-08-04 12:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
It looks ok what PRE does (it's not really a partial partial redundancy but
a full redundndancy).
The bug also reproduces with -O2 -ftree-partial-pre. Disabling loop
optimizations and cddce2 hides the bug.
With PPRE enabled CDDCE2 removes the stores to D.46421.diff (again I see
nothing wrong with doing that).
Btw, this all happens in _M_range_initialize. (-fno-strict-aliasing fixes
the bug as well).
Note that I see stores as OffPtrBase to automatic objects:
- MEM[(struct OffPtrBase *)&D.46421].diff = _70;
and loads from OffPtr via this:
_16 = &MEM[(struct OffPtr *)this_4(D)].D.43564;
or remaining stores:
MEM[(struct OffPtrBase *)this_4(D) + 16B].diff = iftmp.15_41;
I also see:
_74 = (sizetype) _47;
iftmp.10_75 = &D.46429.D.43564 + _74;
__last.3_77 = (long int) iftmp.10_75;
__first.4_78 = (long int) &D.46430.D.43564;
_79 = __last.3_77 - __first.4_78;
which effectively subtracts two unrelated addresses of automatic objects
(boooo - undefined behavior!)
I think the testcase is simply bogus. Can you explain what the "fancy"
pointers
do? Disabling points-to analysis also "fixes" the testcase.
Note that with points-to analysis you cannot reach any other object
with offsetting the address of an object.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
` (2 preceding siblings ...)
2014-08-04 12:00 ` rguenth at gcc dot gnu.org
@ 2014-08-04 12:05 ` tkoeppe at google dot com
2014-08-04 12:13 ` rguenth at gcc dot gnu.org
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: tkoeppe at google dot com @ 2014-08-04 12:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #4 from Thomas Köppe <tkoeppe at google dot com> ---
Ah, you're right, this offset pointer computation as it stands is undefined
behaviour. The intended use is to use those pointers only within a preallocated
arena, so that the pointers would indeed live in a common object (a large
array).
I shall change the allocator to an arena allocator and rerun the test.
The intended use for offset pointers is to inter-process communication; a
vector with the fancy-pointer allocator can be used from two separate
processes.
>From gcc-bugs-return-457690-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 04 12:13:59 2014
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From: "ysrumyan at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/61672] Less redundant instructions deleted by pre_delete after r208113.
Date: Mon, 04 Aug 2014 12:13:00 -0000
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--- Comment #4 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Richard,
I put into attachment original file. For compiler built 20140208 and 20140730
I've got:
grep -c redundant test.cc.179r.pre (20140208)
3825
grep -c redundant test.182r.pre (20140730)
314.
Note also that the following warning is emitted:
art/runtime/interpreter/interpreter_goto_table_impl.cc:2436:1: warning: the
frame size of 3408 bytes is larger than 1728 bytes [-Wframe-larger-than=]
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
` (3 preceding siblings ...)
2014-08-04 12:05 ` tkoeppe at google dot com
@ 2014-08-04 12:13 ` rguenth at gcc dot gnu.org
2014-08-04 13:20 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-08-04 12:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, points-to handles this conservatively, so -fno-tree-pta isn't a real fix
either. We didn't yet spot the real bogus transform.
But indeed makes sure you are computing differences within one arena only.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
` (4 preceding siblings ...)
2014-08-04 12:13 ` rguenth at gcc dot gnu.org
@ 2014-08-04 13:20 ` rguenth at gcc dot gnu.org
2014-08-04 13:23 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
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From: rguenth at gcc dot gnu.org @ 2014-08-04 13:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Smells like a duplicate of PR49330 - still always returning 1 from
base_alias_check doesn't fix the original testcase.
Which also fails with -O -ftree-pre -ftree-partial-pre -fstrict-aliasing btw.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
` (5 preceding siblings ...)
2014-08-04 13:20 ` rguenth at gcc dot gnu.org
@ 2014-08-04 13:23 ` rguenth at gcc dot gnu.org
2014-08-04 13:31 ` tkoeppe at google dot com
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-08-04 13:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
The fixed demog works for me (GCC 4.9 and 4.8 at least).
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
` (6 preceding siblings ...)
2014-08-04 13:23 ` rguenth at gcc dot gnu.org
@ 2014-08-04 13:31 ` tkoeppe at google dot com
2014-08-04 13:44 ` rguenther at suse dot de
2014-08-05 13:06 ` rguenth at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: tkoeppe at google dot com @ 2014-08-04 13:31 UTC (permalink / raw)
To: gcc-bugs
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 2483 bytes --]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #9 from Thomas Köppe <tkoeppe at google dot com> ---
Argh, yes, I compiled the wrong file... indeed, the arena version works with
GCC 4.8.2 for me, too, and in Clang as well.
So... not an issue, I suppose?
The desired real application will be for containers allocated in shared memory,
which is presumably obtained from some opaque system feature.
>From gcc-bugs-return-457707-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 04 13:32:03 2014
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Subject: [Bug fortran/62010] OpenMP simd produces wrong results
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--- Comment #1 from Alexander Grund <alexander.grund at mailbox dot tu-dresden.de> ---
Created attachment 33239
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id3239&actioníit
Testcase 2
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
` (7 preceding siblings ...)
2014-08-04 13:31 ` tkoeppe at google dot com
@ 2014-08-04 13:44 ` rguenther at suse dot de
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9 siblings, 0 replies; 11+ messages in thread
From: rguenther at suse dot de @ 2014-08-04 13:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 4 Aug 2014, tkoeppe at google dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
>
> --- Comment #9 from Thomas Köppe <tkoeppe at google dot com> ---
> Argh, yes, I compiled the wrong file... indeed, the arena version works with
> GCC 4.8.2 for me, too, and in Clang as well.
>
> So... not an issue, I suppose?
I think the issue only triggers when you end up using automatic
variables for the difference computation.
>From gcc-bugs-return-457711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 04 13:48:47 2014
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Subject: [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
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--- Comment #11 from Thomas Köppe <tkoeppe at google dot com> ---
Created attachment 33240
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33240&action=edit
Further fixing: Uses uintptr_ts for the difference
On Jonathan's suggestion I changed the distance computation to go through a
uintptr_t conversion.
Jonathan suggested compiling with -fno-elide-constructors, and indeed the
attached code breaks when that option is passed. As you said, the UB caused by
the distance computations of automatic objects seems to be the stumbling point.
>From gcc-bugs-return-457712-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 04 14:23:29 2014
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Subject: [Bug rtl-optimization/61672] [4.9/4.10 Regression] Less redundant instructions deleted by pre_delete after r208113.
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--- Comment #7 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
It really fixes the issue. Thanks.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)
2014-08-04 10:40 [Bug c++/62006] New: Bad code generation with -O3 (possibly due to -ftree-partial-pre) tkoeppe at google dot com
` (8 preceding siblings ...)
2014-08-04 13:44 ` rguenther at suse dot de
@ 2014-08-05 13:06 ` rguenth at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-08-05 13:06 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |INVALID
--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Invalid.
^ permalink raw reply [flat|nested] 11+ messages in thread