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* [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues
@ 2011-03-01 7:11 d.g.gorbachev at gmail dot com
2011-03-01 10:28 ` [Bug lto/47936] " rguenth at gcc dot gnu.org
` (9 more replies)
0 siblings, 10 replies; 11+ messages in thread
From: d.g.gorbachev at gmail dot com @ 2011-03-01 7:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Summary: [4.6 Regression] Missed optimization with LTO due to
strict aliasing issues
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: d.g.gorbachev@gmail.com
Created attachment 23497
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23497
Testcase
This seems to be different from bug 47924.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
@ 2011-03-01 10:28 ` rguenth at gcc dot gnu.org
2011-03-01 10:30 ` rguenth at gcc dot gnu.org
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-03-01 10:28 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011.03.01 10:28:51
Target Milestone|--- |4.6.0
Ever Confirmed|0 |1
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-01 10:28:51 UTC ---
Confirmed. This one happens because we merge struct S and struct T for
TBAA purposes (they get the same TYPE_CANONICAL).
This is by design to allow cross-language (and slightly invalid) code to
not fall over TBAA issues too easily.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
2011-03-01 10:28 ` [Bug lto/47936] " rguenth at gcc dot gnu.org
@ 2011-03-01 10:30 ` rguenth at gcc dot gnu.org
2011-03-03 11:25 ` rguenth at gcc dot gnu.org
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-03-01 10:30 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-01 10:30:12 UTC ---
IMHO WONTFIX. Eventually we could add a -fvery-strict-aliasing, but it's
probably not worth it.
Leaving open to eventually document this fact somewhere.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
2011-03-01 10:28 ` [Bug lto/47936] " rguenth at gcc dot gnu.org
2011-03-01 10:30 ` rguenth at gcc dot gnu.org
@ 2011-03-03 11:25 ` rguenth at gcc dot gnu.org
2011-03-25 20:03 ` [Bug lto/47936] [4.6/4.7 " jakub at gcc dot gnu.org
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-03-03 11:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P5
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-03 11:25:22 UTC ---
But downgrading priority.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6/4.7 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
` (2 preceding siblings ...)
2011-03-03 11:25 ` rguenth at gcc dot gnu.org
@ 2011-03-25 20:03 ` jakub at gcc dot gnu.org
2011-06-27 16:09 ` jakub at gcc dot gnu.org
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-03-25 20:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.6.0 |4.6.1
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-03-25 19:52:53 UTC ---
GCC 4.6.0 is being released, adjusting target milestone.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6/4.7 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
` (3 preceding siblings ...)
2011-03-25 20:03 ` [Bug lto/47936] [4.6/4.7 " jakub at gcc dot gnu.org
@ 2011-06-27 16:09 ` jakub at gcc dot gnu.org
2011-07-14 23:19 ` d.g.gorbachev at gmail dot com
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-06-27 16:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.6.1 |4.6.2
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-06-27 12:33:06 UTC ---
GCC 4.6.1 is being released.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6/4.7 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
` (4 preceding siblings ...)
2011-06-27 16:09 ` jakub at gcc dot gnu.org
@ 2011-07-14 23:19 ` d.g.gorbachev at gmail dot com
2011-10-26 17:46 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: d.g.gorbachev at gmail dot com @ 2011-07-14 23:19 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Dmitry Gorbachev <d.g.gorbachev at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |4.7.0
--- Comment #6 from Dmitry Gorbachev <d.g.gorbachev at gmail dot com> 2011-07-14 23:19:23 UTC ---
It seems to work in 4.7.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6/4.7 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
` (5 preceding siblings ...)
2011-07-14 23:19 ` d.g.gorbachev at gmail dot com
@ 2011-10-26 17:46 ` jakub at gcc dot gnu.org
2012-03-01 15:09 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-10-26 17:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.6.2 |4.6.3
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-10-26 17:13:50 UTC ---
GCC 4.6.2 is being released.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6/4.7 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
` (6 preceding siblings ...)
2011-10-26 17:46 ` jakub at gcc dot gnu.org
@ 2012-03-01 15:09 ` jakub at gcc dot gnu.org
2013-02-07 0:40 ` [Bug lto/47936] [4.6 " d.g.gorbachev at gmail dot com
2013-04-12 16:18 ` jakub at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-03-01 15:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.6.3 |4.6.4
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-01 14:39:04 UTC ---
GCC 4.6.3 is being released.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
` (7 preceding siblings ...)
2012-03-01 15:09 ` jakub at gcc dot gnu.org
@ 2013-02-07 0:40 ` d.g.gorbachev at gmail dot com
2013-04-12 16:18 ` jakub at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: d.g.gorbachev at gmail dot com @ 2013-02-07 0:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Dmitry Gorbachev <d.g.gorbachev at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|4.7.0 |4.7.3, 4.8.0
Summary|[4.6/4.7/4.8 Regression] |[4.6 Regression] Missed
|Missed optimization with |optimization with LTO due
|LTO due to strict aliasing |to strict aliasing issues
|issues |
Known to fail|4.6.0 |4.6.4
--- Comment #9 from Dmitry Gorbachev <d.g.gorbachev at gmail dot com> 2013-02-07 00:40:06 UTC ---
I can't reproduce it with GCC 4.7.3 and 4.8.0.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug lto/47936] [4.6 Regression] Missed optimization with LTO due to strict aliasing issues
2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
` (8 preceding siblings ...)
2013-02-07 0:40 ` [Bug lto/47936] [4.6 " d.g.gorbachev at gmail dot com
@ 2013-04-12 16:18 ` jakub at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-04-12 16:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47936
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|4.6.4 |4.7.0
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-12 16:17:53 UTC ---
The 4.6 branch has been closed, fixed in GCC 4.7.0.
^ permalink raw reply [flat|nested] 11+ messages in thread
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2011-03-01 7:11 [Bug lto/47936] New: [4.6 Regression] Missed optimization with LTO due to strict aliasing issues d.g.gorbachev at gmail dot com
2011-03-01 10:28 ` [Bug lto/47936] " rguenth at gcc dot gnu.org
2011-03-01 10:30 ` rguenth at gcc dot gnu.org
2011-03-03 11:25 ` rguenth at gcc dot gnu.org
2011-03-25 20:03 ` [Bug lto/47936] [4.6/4.7 " jakub at gcc dot gnu.org
2011-06-27 16:09 ` jakub at gcc dot gnu.org
2011-07-14 23:19 ` d.g.gorbachev at gmail dot com
2011-10-26 17:46 ` jakub at gcc dot gnu.org
2012-03-01 15:09 ` jakub at gcc dot gnu.org
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