public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [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
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).