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* [Bug lto/47900] New: Missed optimization with LTO
@ 2011-02-26 8:54 d.g.gorbachev at gmail dot com
2011-02-27 15:14 ` [Bug lto/47900] " rguenth at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: d.g.gorbachev at gmail dot com @ 2011-02-26 8:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47900
Summary: Missed optimization with LTO
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 23474
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23474
Testcase
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug lto/47900] Missed optimization with LTO
2011-02-26 8:54 [Bug lto/47900] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
@ 2011-02-27 15:14 ` rguenth at gcc dot gnu.org
2011-02-27 20:03 ` d.g.gorbachev at gmail dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-02-27 15:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47900
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2011.02.27 15:13:22
Ever Confirmed|0 |1
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-02-27 15:13:22 UTC ---
I fail to see what the missed optimization is, can you try to explain?
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug lto/47900] Missed optimization with LTO
2011-02-26 8:54 [Bug lto/47900] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
2011-02-27 15:14 ` [Bug lto/47900] " rguenth at gcc dot gnu.org
@ 2011-02-27 20:03 ` d.g.gorbachev at gmail dot com
2011-02-27 20:09 ` rguenth at gcc dot gnu.org
2013-02-07 0:13 ` d.g.gorbachev at gmail dot com
3 siblings, 0 replies; 5+ messages in thread
From: d.g.gorbachev at gmail dot com @ 2011-02-27 20:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47900
--- Comment #2 from Dmitry Gorbachev <d.g.gorbachev at gmail dot com> 2011-02-27 19:57:01 UTC ---
A null pointer check (... && ! &p->i) is not eliminated, notwithstanding the
fact that the pointer has been dereferenced. If it is not null, bar is not
called; otherwise, there is an undefined behavior, and bar is not called.
Or is it too an unimportant problem?
(It's interesting, after changing S_ptr p to struct S *p, the non-LTO build
also fails with "undefined reference to `bar'".)
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug lto/47900] Missed optimization with LTO
2011-02-26 8:54 [Bug lto/47900] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
2011-02-27 15:14 ` [Bug lto/47900] " rguenth at gcc dot gnu.org
2011-02-27 20:03 ` d.g.gorbachev at gmail dot com
@ 2011-02-27 20:09 ` rguenth at gcc dot gnu.org
2013-02-07 0:13 ` d.g.gorbachev at gmail dot com
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-02-27 20:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47900
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-02-27 20:03:05 UTC ---
Hm, ok. It's surely worth investigating.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug lto/47900] Missed optimization with LTO
2011-02-26 8:54 [Bug lto/47900] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
` (2 preceding siblings ...)
2011-02-27 20:09 ` rguenth at gcc dot gnu.org
@ 2013-02-07 0:13 ` d.g.gorbachev at gmail dot com
3 siblings, 0 replies; 5+ messages in thread
From: d.g.gorbachev at gmail dot com @ 2013-02-07 0:13 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47900
Dmitry Gorbachev <d.g.gorbachev at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |WORKSFORME
--- Comment #4 from Dmitry Gorbachev <d.g.gorbachev at gmail dot com> 2013-02-07 00:13:03 UTC ---
I can't reproduce it with GCC 4.6.4, 4.7.3, 4.8.0.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-02-07 0:13 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2011-02-26 8:54 [Bug lto/47900] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
2011-02-27 15:14 ` [Bug lto/47900] " rguenth at gcc dot gnu.org
2011-02-27 20:03 ` d.g.gorbachev at gmail dot com
2011-02-27 20:09 ` rguenth at gcc dot gnu.org
2013-02-07 0:13 ` d.g.gorbachev at gmail dot com
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