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* [Bug c++/95638] New: Legit-looking code doesn't work with -O2
@ 2020-06-11 11:45 officesamurai at gmail dot com
2020-06-11 12:08 ` [Bug c++/95638] " jakub at gcc dot gnu.org
` (16 more replies)
0 siblings, 17 replies; 18+ messages in thread
From: officesamurai at gmail dot com @ 2020-06-11 11:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
Bug ID: 95638
Summary: Legit-looking code doesn't work with -O2
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: officesamurai at gmail dot com
Target Milestone: ---
Created attachment 48718
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48718&action=edit
The failing code
The attached code produces wrong result when build with -O2 and without
-fno-strict-aliasing, but I don't believe it does anything illegal. The only
fishy thing it does is creating a pointer to T before an object of that type is
constructed at that location (in Storage::Storage and Storage::push_back), but
the pointer is just passed to the placement new, which should be fine according
to [basic.life] (because "...using the pointer as if the pointer were of type
void*, is well-defined").
------------------------
$ g++-10.1.0 -v
Using built-in specs.
COLLECT_GCC=g++-10.1.0
COLLECT_LTO_WRAPPER=/home/brd/soft/gcc-10.1.0/libexec/gcc/x86_64-pc-linux-gnu/10.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --prefix=/home/brd/soft/gcc-10.1.0
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.1.0 (GCC)
$ g++-10.1.0 -O2 gcc10_aliasing_issue.cpp -o test -std=c++14 && ./test
Null!!!
$ g++-10.1.0 -O2 -fno-strict-aliasing gcc10_aliasing_issue.cpp -o test
-std=c++14 && ./test
OK
------------------------
P.S. The same code works fine with GCC 9 and earlier versions.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/95638] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
@ 2020-06-11 12:08 ` jakub at gcc dot gnu.org
2020-06-11 12:12 ` marxin at gcc dot gnu.org
` (15 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: jakub at gcc dot gnu.org @ 2020-06-11 12:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amker at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
All I can say is that bisection shows (at least when preprocessed with g++
8.3.1 first) that this changed behavior in
r10-7184-ge4e9a59105a81cdd6c1328b0a5ed9fe4cc82840e
No time to analyze if it is a bug in the code or on the GCC side.
CCing patch author.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/95638] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
2020-06-11 12:08 ` [Bug c++/95638] " jakub at gcc dot gnu.org
@ 2020-06-11 12:12 ` marxin at gcc dot gnu.org
2020-06-11 12:23 ` jakub at gcc dot gnu.org
` (14 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: marxin at gcc dot gnu.org @ 2020-06-11 12:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
The code works with -flifetime-dse=1, so I bet there's some object that goes
out of life:
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
https://gcc.gnu.org/gcc-6/porting_to.html#flifetime-dse
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/95638] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
2020-06-11 12:08 ` [Bug c++/95638] " jakub at gcc dot gnu.org
2020-06-11 12:12 ` marxin at gcc dot gnu.org
@ 2020-06-11 12:23 ` jakub at gcc dot gnu.org
2020-06-11 15:40 ` redi at gcc dot gnu.org
` (13 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: jakub at gcc dot gnu.org @ 2020-06-11 12:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #2)
> The code works with -flifetime-dse=1, so I bet there's some object that goes
> out of life:
> https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
> https://gcc.gnu.org/gcc-6/porting_to.html#flifetime-dse
The difference between -flifetime-dse=1 and the default is not in uses after
end of scope, but in relying on content being defined across start of the
constructor.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/95638] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (2 preceding siblings ...)
2020-06-11 12:23 ` jakub at gcc dot gnu.org
@ 2020-06-11 15:40 ` redi at gcc dot gnu.org
2020-06-12 1:17 ` amker at gcc dot gnu.org
` (12 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: redi at gcc dot gnu.org @ 2020-06-11 15:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't see anything obviously wrong with the code. Nothing seems to write to
the storage before the constructor, let alone rely on those writes being
preserved.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/95638] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (3 preceding siblings ...)
2020-06-11 15:40 ` redi at gcc dot gnu.org
@ 2020-06-12 1:17 ` amker at gcc dot gnu.org
2020-06-12 7:20 ` [Bug c++/95638] [10/11 Regression] " rguenth at gcc dot gnu.org
` (11 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: amker at gcc dot gnu.org @ 2020-06-12 1:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #5 from bin cheng <amker at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> All I can say is that bisection shows (at least when preprocessed with g++
> 8.3.1 first) that this changed behavior in
> r10-7184-ge4e9a59105a81cdd6c1328b0a5ed9fe4cc82840e
> No time to analyze if it is a bug in the code or on the GCC side.
> CCing patch author.
Thanks for ccing, I will look into it this WE.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/95638] [10/11 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (4 preceding siblings ...)
2020-06-12 1:17 ` amker at gcc dot gnu.org
@ 2020-06-12 7:20 ` rguenth at gcc dot gnu.org
2020-06-14 0:47 ` amker at gcc dot gnu.org
` (10 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-06-12 7:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.3.0
Summary|Legit-looking code doesn't |[10/11 Regression]
|work with -O2 |Legit-looking code doesn't
| |work with -O2
Keywords| |wrong-code
Target Milestone|--- |10.2
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/95638] [10/11 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (5 preceding siblings ...)
2020-06-12 7:20 ` [Bug c++/95638] [10/11 Regression] " rguenth at gcc dot gnu.org
@ 2020-06-14 0:47 ` amker at gcc dot gnu.org
2020-06-20 7:56 ` [Bug tree-optimization/95638] " cvs-commit at gcc dot gnu.org
` (9 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: amker at gcc dot gnu.org @ 2020-06-14 0:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #6 from bin cheng <amker at gcc dot gnu.org> ---
We call graphds_scc twice to break alias dependence, with alias dependence
edges skipped in the second call. The code (both before and after
r10-7184-ge4e9a59105a81cdd6c1328b0a5ed9fe4cc82840e) tries to rectify post order
information after the second call, however it never gets it right. Actually I
don't think it can be easily rectified (if possible).
Will test another patch which records/restores post order information for the
second call.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10/11 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (6 preceding siblings ...)
2020-06-14 0:47 ` amker at gcc dot gnu.org
@ 2020-06-20 7:56 ` cvs-commit at gcc dot gnu.org
2020-06-29 10:07 ` jakub at gcc dot gnu.org
` (8 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-06-20 7:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Bin Cheng <amker@gcc.gnu.org>:
https://gcc.gnu.org/g:2c0069fafb53ccb7a45a6815025dfcbd2882a36e
commit r11-1565-g2c0069fafb53ccb7a45a6815025dfcbd2882a36e
Author: Bin Cheng <bin.cheng@linux.alibaba.com>
Date: Sat Jun 20 15:42:12 2020 +0800
Record and restore postorder information in breaking alias sccs.
gcc/
PR tree-optimization/95638
* tree-loop-distribution.c (pg_edge_callback_data): New field.
(loop_distribution::break_alias_scc_partitions): Record and restore
postorder information. Fix memory leak.
gcc/testsuite/
PR tree-optimization/95638
* g++.dg/tree-ssa/pr95638.C: New test.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10/11 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (7 preceding siblings ...)
2020-06-20 7:56 ` [Bug tree-optimization/95638] " cvs-commit at gcc dot gnu.org
@ 2020-06-29 10:07 ` jakub at gcc dot gnu.org
2020-06-29 12:10 ` amker at gcc dot gnu.org
` (7 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: jakub at gcc dot gnu.org @ 2020-06-29 10:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So fixed on the trunk, waiting for 10 backport?
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10/11 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (8 preceding siblings ...)
2020-06-29 10:07 ` jakub at gcc dot gnu.org
@ 2020-06-29 12:10 ` amker at gcc dot gnu.org
2020-07-09 11:47 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: amker at gcc dot gnu.org @ 2020-06-29 12:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #9 from bin cheng <amker at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #8)
> So fixed on the trunk, waiting for 10 backport?
Sorry, https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95804 is also in this part
which I believe is related to this fix. Will backport the full patch after
fixing 95804.
Thanks
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10/11 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (9 preceding siblings ...)
2020-06-29 12:10 ` amker at gcc dot gnu.org
@ 2020-07-09 11:47 ` rguenth at gcc dot gnu.org
2020-07-09 11:48 ` [Bug tree-optimization/95638] [10 " rguenth at gcc dot gnu.org
` (5 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-07-09 11:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
Bug 95638 depends on bug 95804, which changed state.
Bug 95804 Summary: [11 Regression] ICE in generate_code_for_partition, at tree-loop-distribution.c:1323 since r11-1565-g2c0069fafb53ccb7
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95804
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (10 preceding siblings ...)
2020-07-09 11:47 ` rguenth at gcc dot gnu.org
@ 2020-07-09 11:48 ` rguenth at gcc dot gnu.org
2020-07-10 3:59 ` cvs-commit at gcc dot gnu.org
` (4 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-07-09 11:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |amker at gcc dot gnu.org
Last reconfirmed| |2020-07-09
Known to fail| |10.1.0
Summary|[10/11 Regression] |[10 Regression]
|Legit-looking code doesn't |Legit-looking code doesn't
|work with -O2 |work with -O2
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
Known to work| |11.0
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (11 preceding siblings ...)
2020-07-09 11:48 ` [Bug tree-optimization/95638] [10 " rguenth at gcc dot gnu.org
@ 2020-07-10 3:59 ` cvs-commit at gcc dot gnu.org
2020-07-10 4:12 ` cvs-commit at gcc dot gnu.org
` (3 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-07-10 3:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Bin Cheng <amker@gcc.gnu.org>:
https://gcc.gnu.org/g:f737ca45bee4ea61571393e04495955aeb7d67ab
commit r10-8453-gf737ca45bee4ea61571393e04495955aeb7d67ab
Author: Bin Cheng <bin.cheng@linux.alibaba.com>
Date: Sat Jun 20 15:42:12 2020 +0800
Record and restore postorder information in breaking alias sccs.
gcc/
PR tree-optimization/95638
* tree-loop-distribution.c (pg_edge_callback_data): New field.
(loop_distribution::break_alias_scc_partitions): Record and restore
postorder information. Fix memory leak.
gcc/testsuite/
PR tree-optimization/95638
* g++.dg/tree-ssa/pr95638.C: New test.
(cherry picked from commit 2c0069fafb53ccb7a45a6815025dfcbd2882a36e)
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (12 preceding siblings ...)
2020-07-10 3:59 ` cvs-commit at gcc dot gnu.org
@ 2020-07-10 4:12 ` cvs-commit at gcc dot gnu.org
2020-07-23 6:51 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-07-10 4:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Bin Cheng <amker@gcc.gnu.org>:
https://gcc.gnu.org/g:dc7a8afce35eb8948b481b5bcb8d26124a267f55
commit r9-8730-gdc7a8afce35eb8948b481b5bcb8d26124a267f55
Author: Bin Cheng <bin.cheng@linux.alibaba.com>
Date: Sat Jun 20 15:42:12 2020 +0800
Record and restore postorder information in breaking alias sccs.
gcc/
PR tree-optimization/95638
* tree-loop-distribution.c (pg_edge_callback_data): New field.
(loop_distribution::break_alias_scc_partitions): Record and restore
postorder information. Fix memory leak.
gcc/testsuite/
PR tree-optimization/95638
* g++.dg/tree-ssa/pr95638.C: New test.
(cherry picked from commit 2c0069fafb53ccb7a45a6815025dfcbd2882a36e)
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (13 preceding siblings ...)
2020-07-10 4:12 ` cvs-commit at gcc dot gnu.org
@ 2020-07-23 6:51 ` rguenth at gcc dot gnu.org
2020-07-23 7:11 ` amker at gcc dot gnu.org
2021-03-27 2:44 ` amker at gcc dot gnu.org
16 siblings, 0 replies; 18+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-07-23 6:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|10.2 |10.3
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10.2 is released, adjusting target milestone.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (14 preceding siblings ...)
2020-07-23 6:51 ` rguenth at gcc dot gnu.org
@ 2020-07-23 7:11 ` amker at gcc dot gnu.org
2021-03-27 2:44 ` amker at gcc dot gnu.org
16 siblings, 0 replies; 18+ messages in thread
From: amker at gcc dot gnu.org @ 2020-07-23 7:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #14 from bin cheng <amker at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #13)
> GCC 10.2 is released, adjusting target milestone.
Hmm, this should be fixed on GCC10/GCC9. I backported PR95638/PR95804
separately using cherry-pick, so the backport information for latter PR is not
reflected here.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug tree-optimization/95638] [10 Regression] Legit-looking code doesn't work with -O2
2020-06-11 11:45 [Bug c++/95638] New: Legit-looking code doesn't work with -O2 officesamurai at gmail dot com
` (15 preceding siblings ...)
2020-07-23 7:11 ` amker at gcc dot gnu.org
@ 2021-03-27 2:44 ` amker at gcc dot gnu.org
16 siblings, 0 replies; 18+ messages in thread
From: amker at gcc dot gnu.org @ 2021-03-27 2:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
bin cheng <amker at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |10.2.0
Resolution|--- |FIXED
--- Comment #15 from bin cheng <amker at gcc dot gnu.org> ---
Confirmed fixed for 10.2.0 also. Closing.
^ permalink raw reply [flat|nested] 18+ messages in thread
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