public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug optimization/13751] New: PHI pruning misses obvious cases
@ 2004-01-19 23:08 rth at gcc dot gnu dot org
2004-01-20 2:22 ` [Bug optimization/13751] [tree-ssa] " pinskia at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: rth at gcc dot gnu dot org @ 2004-01-19 23:08 UTC (permalink / raw)
To: gcc-bugs
For gcc.c-torture/compile/920625-1.c, compile with -O -fdump-tree-sra-vops.
Notice at the end of the first function,
# SR.16_4 = PHI <SR.16_3(2), SR.16_75(3), SR.16_85(1)>;
# SR.15_5 = PHI <SR.15_1(2), SR.15_74(3), SR.15_84(1)>;
# SR.14_6 = PHI <SR.14_9(2), SR.14_12(3), SR.14_83(1)>;
# SR.13_7 = PHI <SR.13_10(2), SR.13_11(3), SR.13_82(1)>;
# MT.12_8 = PHI <MT.12_2(2), MT.12_80(3), MT.12_91(1)>;
<L3>:;
<L4>:;
return;
None of those are needed. Though of course it's the PHIs for real vars that's
more important that the PHI for the VDEF.
--
Summary: PHI pruning misses obvious cases
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Severity: enhancement
Priority: P2
Component: optimization
AssignedTo: dnovillo at gcc dot gnu dot org
ReportedBy: rth at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13751
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/13751] [tree-ssa] PHI pruning misses obvious cases
2004-01-19 23:08 [Bug optimization/13751] New: PHI pruning misses obvious cases rth at gcc dot gnu dot org
@ 2004-01-20 2:22 ` pinskia at gcc dot gnu dot org
2004-02-05 1:19 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-01-20 2:22 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-01-20 02:22 -------
Confirmed. Some more at the end of the other function (a lot more, all SR's).
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2004-01-20 02:22:03
date| |
Summary|PHI pruning misses obvious |[tree-ssa] PHI pruning
|cases |misses obvious cases
Target Milestone|--- |tree-ssa
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13751
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/13751] [tree-ssa] PHI pruning misses obvious cases
2004-01-19 23:08 [Bug optimization/13751] New: PHI pruning misses obvious cases rth at gcc dot gnu dot org
2004-01-20 2:22 ` [Bug optimization/13751] [tree-ssa] " pinskia at gcc dot gnu dot org
@ 2004-02-05 1:19 ` pinskia at gcc dot gnu dot org
2004-02-16 22:20 ` law at gcc dot gnu dot org
2004-02-16 23:48 ` dnovillo at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-02-05 1:19 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-02-05 01:19 -------
Seems fixed in 20040131. RTH, can you try again to check if this is fixed?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13751
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/13751] [tree-ssa] PHI pruning misses obvious cases
2004-01-19 23:08 [Bug optimization/13751] New: PHI pruning misses obvious cases rth at gcc dot gnu dot org
2004-01-20 2:22 ` [Bug optimization/13751] [tree-ssa] " pinskia at gcc dot gnu dot org
2004-02-05 1:19 ` pinskia at gcc dot gnu dot org
@ 2004-02-16 22:20 ` law at gcc dot gnu dot org
2004-02-16 23:48 ` dnovillo at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: law at gcc dot gnu dot org @ 2004-02-16 22:20 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From law at gcc dot gnu dot org 2004-02-16 22:20 -------
Probably fixed by the DSE changes to allow it to remove PHIs for virtual variables
when the virtual variables were never used.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13751
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/13751] [tree-ssa] PHI pruning misses obvious cases
2004-01-19 23:08 [Bug optimization/13751] New: PHI pruning misses obvious cases rth at gcc dot gnu dot org
` (2 preceding siblings ...)
2004-02-16 22:20 ` law at gcc dot gnu dot org
@ 2004-02-16 23:48 ` dnovillo at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: dnovillo at redhat dot com @ 2004-02-16 23:48 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From dnovillo at redhat dot com 2004-02-16 23:48 -------
Subject: Re: [tree-ssa] PHI pruning misses obvious
cases
On Mon, 2004-02-16 at 17:20, law at gcc dot gnu dot org wrote:
> Probably fixed by the DSE changes to allow it to remove PHIs for virtual variables
> when the virtual variables were never used.
>
Actually, this one has been fixed for a few days now :)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13751
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2004-02-16 23:48 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-01-19 23:08 [Bug optimization/13751] New: PHI pruning misses obvious cases rth at gcc dot gnu dot org
2004-01-20 2:22 ` [Bug optimization/13751] [tree-ssa] " pinskia at gcc dot gnu dot org
2004-02-05 1:19 ` pinskia at gcc dot gnu dot org
2004-02-16 22:20 ` law at gcc dot gnu dot org
2004-02-16 23:48 ` dnovillo at redhat dot com
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).