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* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
[not found] <20040515032618.15452.kazu@gcc.gnu.org>
@ 2005-07-12 21:27 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-12 21:27 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-12 21:26 -------
It might be a while for me to rewrite the tree combiner so unassigning for now.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|pinskia at gcc dot gnu dot |unassigned at gcc dot gnu
|org |dot org
Status|ASSIGNED |NEW
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
[not found] <bug-15452-4@http.gcc.gnu.org/bugzilla/>
@ 2014-10-31 4:02 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu.org @ 2014-10-31 4:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
Bug 15452 depends on bug 15459, which changed state.
Bug 15459 Summary: [meta-bug] there should be a tree combiner like the rtl one
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15459
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
[not found] <bug-15452-5009@http.gcc.gnu.org/bugzilla/>
2006-08-24 4:28 ` pinskia at gcc dot gnu dot org
2006-08-24 14:43 ` dberlin at dberlin dot org
@ 2009-04-22 21:05 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-04-22 21:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from pinskia at gcc dot gnu dot org 2009-04-22 21:05 -------
This has been fixed for a while now, at least since 4.4.0.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.4.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
2006-08-24 4:28 ` pinskia at gcc dot gnu dot org
@ 2006-08-24 14:43 ` Daniel Berlin
0 siblings, 0 replies; 10+ messages in thread
From: Daniel Berlin @ 2006-08-24 14:43 UTC (permalink / raw)
To: gcc-bugzilla; +Cc: gcc-bugs
pinskia at gcc dot gnu dot org wrote:
> ------- Comment #6 from pinskia at gcc dot gnu dot org 2006-08-24 04:27 -------
> Another interesting case would be (but which could be handled by VRP):
> int
> foo (int a)
> {
> a = a!=0;
> a = a!=0;
> a = a!=0;
> a = a!=0;
> a = a!=0;
> return a;
> }
> Which should be optimized to:
> int foo(int a) { return a!=0;}
>
>
Uh, FRE could also optimize this to the same thing, I just don't
remember whether it bothers to look at conditionals as eliminable
expressions.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
[not found] <bug-15452-5009@http.gcc.gnu.org/bugzilla/>
2006-08-24 4:28 ` pinskia at gcc dot gnu dot org
@ 2006-08-24 14:43 ` dberlin at dberlin dot org
2009-04-22 21:05 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 10+ messages in thread
From: dberlin at dberlin dot org @ 2006-08-24 14:43 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from dberlin at gcc dot gnu dot org 2006-08-24 14:43 -------
Subject: Re: [tree-ssa] Optimize cascaded a
= a == 0;
pinskia at gcc dot gnu dot org wrote:
> ------- Comment #6 from pinskia at gcc dot gnu dot org 2006-08-24 04:27 -------
> Another interesting case would be (but which could be handled by VRP):
> int
> foo (int a)
> {
> a = a!=0;
> a = a!=0;
> a = a!=0;
> a = a!=0;
> a = a!=0;
> return a;
> }
> Which should be optimized to:
> int foo(int a) { return a!=0;}
>
>
Uh, FRE could also optimize this to the same thing, I just don't
remember whether it bothers to look at conditionals as eliminable
expressions.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
[not found] <bug-15452-5009@http.gcc.gnu.org/bugzilla/>
@ 2006-08-24 4:28 ` pinskia at gcc dot gnu dot org
2006-08-24 14:43 ` Daniel Berlin
2006-08-24 14:43 ` dberlin at dberlin dot org
2009-04-22 21:05 ` pinskia at gcc dot gnu dot org
2 siblings, 1 reply; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-08-24 4:28 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from pinskia at gcc dot gnu dot org 2006-08-24 04:27 -------
Another interesting case would be (but which could be handled by VRP):
int
foo (int a)
{
a = a!=0;
a = a!=0;
a = a!=0;
a = a!=0;
a = a!=0;
return a;
}
Which should be optimized to:
int foo(int a) { return a!=0;}
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
2004-05-15 18:25 [Bug tree-optimization/15452] New: " kazu at cs dot umass dot edu
` (2 preceding siblings ...)
2004-05-31 6:47 ` pinskia at gcc dot gnu dot org
@ 2004-06-21 5:14 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-06-21 5:14 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-06-21 05:14 -------
Will be submitting my tree combiner tonight.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
2004-05-15 18:25 [Bug tree-optimization/15452] New: " kazu at cs dot umass dot edu
2004-05-15 18:35 ` [Bug tree-optimization/15452] " pinskia at gcc dot gnu dot org
2004-05-17 18:25 ` pinskia at gcc dot gnu dot org
@ 2004-05-31 6:47 ` pinskia at gcc dot gnu dot org
2004-06-21 5:14 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-31 6:47 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-30 04:55 -------
Mine.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |pinskia at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
2004-05-15 18:25 [Bug tree-optimization/15452] New: " kazu at cs dot umass dot edu
2004-05-15 18:35 ` [Bug tree-optimization/15452] " pinskia at gcc dot gnu dot org
@ 2004-05-17 18:25 ` pinskia at gcc dot gnu dot org
2004-05-31 6:47 ` pinskia at gcc dot gnu dot org
2004-06-21 5:14 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-17 18:25 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-17 01:58 -------
Definitely will be fixed when PR 15459 is fixed.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0;
2004-05-15 18:25 [Bug tree-optimization/15452] New: " kazu at cs dot umass dot edu
@ 2004-05-15 18:35 ` pinskia at gcc dot gnu dot org
2004-05-17 18:25 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-15 18:35 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-15 03:40 -------
Confirmed, I think this is what a TREE combiner (just like the rtl one) would do just like a couple of your
other bugs.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Keywords| |TREE
Last reconfirmed|0000-00-00 00:00:00 |2004-05-15 03:40:47
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15452
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2014-10-31 4:02 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <20040515032618.15452.kazu@gcc.gnu.org>
2005-07-12 21:27 ` [Bug tree-optimization/15452] [tree-ssa] Optimize cascaded a = a == 0; pinskia at gcc dot gnu dot org
[not found] <bug-15452-4@http.gcc.gnu.org/bugzilla/>
2014-10-31 4:02 ` pinskia at gcc dot gnu.org
[not found] <bug-15452-5009@http.gcc.gnu.org/bugzilla/>
2006-08-24 4:28 ` pinskia at gcc dot gnu dot org
2006-08-24 14:43 ` Daniel Berlin
2006-08-24 14:43 ` dberlin at dberlin dot org
2009-04-22 21:05 ` pinskia at gcc dot gnu dot org
2004-05-15 18:25 [Bug tree-optimization/15452] New: " kazu at cs dot umass dot edu
2004-05-15 18:35 ` [Bug tree-optimization/15452] " pinskia at gcc dot gnu dot org
2004-05-17 18:25 ` pinskia at gcc dot gnu dot org
2004-05-31 6:47 ` pinskia at gcc dot gnu dot org
2004-06-21 5:14 ` pinskia at gcc dot gnu dot org
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