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* [Bug lto/56232] New: Missed optimization with LTO
@ 2013-02-07 0:30 d.g.gorbachev at gmail dot com
2013-02-07 0:54 ` [Bug lto/56232] " pinskia at gcc dot gnu.org
2013-02-07 10:45 ` rguenth at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: d.g.gorbachev at gmail dot com @ 2013-02-07 0:30 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56232
Bug #: 56232
Summary: Missed optimization with LTO
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: lto
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: d.g.gorbachev@gmail.com
Created attachment 29377
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29377
Compile with -flto -O2
/tmp/cce3xw28.ltrans0.ltrans.o:cce3xw28.ltrans0.o:function main: error:
undefined reference to 'bar'
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug lto/56232] Missed optimization with LTO
2013-02-07 0:30 [Bug lto/56232] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
@ 2013-02-07 0:54 ` pinskia at gcc dot gnu.org
2013-02-07 10:45 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2013-02-07 0:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56232
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2013-02-07 00:54:02 UTC ---
Strict aliasing is effectively turned off for LTO.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug lto/56232] Missed optimization with LTO
2013-02-07 0:30 [Bug lto/56232] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
2013-02-07 0:54 ` [Bug lto/56232] " pinskia at gcc dot gnu.org
@ 2013-02-07 10:45 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-02-07 10:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56232
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |WONTFIX
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> 2013-02-07 10:45:30 UTC ---
(In reply to comment #1)
> Strict aliasing is effectively turned off for LTO.
That's not true. It's just weakened to the extend to make structurally
equivalent types have the same alias sets. In this case struct S and
struct T are aliasing.
So indeed this works as designed.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-02-07 10:45 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2013-02-07 0:30 [Bug lto/56232] New: Missed optimization with LTO d.g.gorbachev at gmail dot com
2013-02-07 0:54 ` [Bug lto/56232] " pinskia at gcc dot gnu.org
2013-02-07 10:45 ` rguenth at gcc dot gnu.org
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