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* [Bug tree-optimization/31914] New: FRE does not do const or copy propagation while it could
@ 2007-05-13 21:32 rguenth at gcc dot gnu dot org
2007-11-04 15:51 ` [Bug tree-optimization/31914] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-05-13 21:32 UTC (permalink / raw)
To: gcc-bugs
FRE has all the information available, it's simply not used because eliminate()
does not consider copy statements (and does not run elimination on PHI
arguments
for the same reason). Also for full const/copy propagation COND_EXPRs need to
be value-numbered.
This would let us get rid of a copyprop and a ccp pass.
I have a prototype patch (still lacks COND_EXPR VN).
--
Summary: FRE does not do const or copy propagation while it could
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
BugsThisDependsOn: 30997
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31914
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug tree-optimization/31914] FRE does not do const or copy propagation while it could 2007-05-13 21:32 [Bug tree-optimization/31914] New: FRE does not do const or copy propagation while it could rguenth at gcc dot gnu dot org @ 2007-11-04 15:51 ` pinskia at gcc dot gnu dot org 2008-01-07 13:07 ` rguenth at gcc dot gnu dot org 2009-04-04 17:58 ` rguenth at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2007-11-04 15:51 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from pinskia at gcc dot gnu dot org 2007-11-04 15:51 ------- Confirmed. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |pinskia at gcc dot gnu dot | |org Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|0000-00-00 00:00:00 |2007-11-04 15:51:43 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31914 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/31914] FRE does not do const or copy propagation while it could 2007-05-13 21:32 [Bug tree-optimization/31914] New: FRE does not do const or copy propagation while it could rguenth at gcc dot gnu dot org 2007-11-04 15:51 ` [Bug tree-optimization/31914] " pinskia at gcc dot gnu dot org @ 2008-01-07 13:07 ` rguenth at gcc dot gnu dot org 2009-04-04 17:58 ` rguenth at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu dot org @ 2008-01-07 13:07 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from rguenth at gcc dot gnu dot org 2008-01-07 12:11 ------- Created an attachment (id=14893) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14893&action=view) patch for copyprop in the simple case Produced while working on PR34683 (though doesn't help that significantly). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31914 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/31914] FRE does not do const or copy propagation while it could 2007-05-13 21:32 [Bug tree-optimization/31914] New: FRE does not do const or copy propagation while it could rguenth at gcc dot gnu dot org 2007-11-04 15:51 ` [Bug tree-optimization/31914] " pinskia at gcc dot gnu dot org 2008-01-07 13:07 ` rguenth at gcc dot gnu dot org @ 2009-04-04 17:58 ` rguenth at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu dot org @ 2009-04-04 17:58 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from rguenth at gcc dot gnu dot org 2009-04-04 17:58 ------- I think we don't want this one being fixed. -- rguenth at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |WONTFIX http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31914 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-04-04 17:58 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2007-05-13 21:32 [Bug tree-optimization/31914] New: FRE does not do const or copy propagation while it could rguenth at gcc dot gnu dot org 2007-11-04 15:51 ` [Bug tree-optimization/31914] " pinskia at gcc dot gnu dot org 2008-01-07 13:07 ` rguenth at gcc dot gnu dot org 2009-04-04 17:58 ` rguenth at gcc dot gnu dot org
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