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* [Bug tree-optimization/22325] New: missed optimization in loop
@ 2005-07-06 15:18 pinskia at gcc dot gnu dot org
2005-07-06 15:23 ` [Bug tree-optimization/22325] " pinskia at gcc dot gnu dot org
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-06 15:18 UTC (permalink / raw)
To: gcc-bugs
The following two functions should be the same:
int foo(int a) {
int i;
for (i=0; i<200; i++) {
a = a + 5;
}
return a;
}
int foo(int a) {
int i;
for (i=0; i<200; i++) ;
return a+5*200;
}
The RTL optimizers catch this on ppc but not on x86.
--
Summary: missed optimization in loop
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: missed-optimization, TREE
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
@ 2005-07-06 15:23 ` pinskia at gcc dot gnu dot org
2005-07-07 19:58 ` pinskia at gcc dot gnu dot org
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-06 15:23 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-06 15:23 -------
And then we can remove the empty loop which is PR 17640.
--
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |17640
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
2005-07-06 15:23 ` [Bug tree-optimization/22325] " pinskia at gcc dot gnu dot org
@ 2005-07-07 19:58 ` pinskia at gcc dot gnu dot org
2005-07-07 20:03 ` pinskia at gcc dot gnu dot org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-07 19:58 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-07 19:57 -------
The old RTL loop optimizer is the one which catches this as shown by adding -floop-optimize2 to
disable the old RTL loop optimizer.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
2005-07-06 15:23 ` [Bug tree-optimization/22325] " pinskia at gcc dot gnu dot org
2005-07-07 19:58 ` pinskia at gcc dot gnu dot org
@ 2005-07-07 20:03 ` pinskia at gcc dot gnu dot org
2005-07-07 20:06 ` steven at gcc dot gnu dot org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-07 20:03 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-07 20:02 -------
Assigning to Zdenek as requested by Honza.
I will note if the start of a was a constant we do the optimization at the tree level.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rakdver at gcc dot gnu dot
|dot org |org
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2005-07-07 20:02:45
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
` (2 preceding siblings ...)
2005-07-07 20:03 ` pinskia at gcc dot gnu dot org
@ 2005-07-07 20:06 ` steven at gcc dot gnu dot org
2005-07-07 20:16 ` pinskia at gcc dot gnu dot org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: steven at gcc dot gnu dot org @ 2005-07-07 20:06 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From steven at gcc dot gnu dot org 2005-07-07 20:06 -------
This is related to Bug 18687.
--
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |18687
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
` (3 preceding siblings ...)
2005-07-07 20:06 ` steven at gcc dot gnu dot org
@ 2005-07-07 20:16 ` pinskia at gcc dot gnu dot org
2005-07-12 0:02 ` pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-07 20:16 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-07 20:16 -------
This looks related to PR 20656.
--
What |Removed |Added
----------------------------------------------------------------------------
OtherBugsDependingO| |20656
nThis| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
` (4 preceding siblings ...)
2005-07-07 20:16 ` pinskia at gcc dot gnu dot org
@ 2005-07-12 0:02 ` pinskia at gcc dot gnu dot org
2005-07-15 17:15 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-12 0:02 UTC (permalink / raw)
To: gcc-bugs
--
Bug 22325 depends on bug 17640, which changed state.
Bug 17640 Summary: empty loop not removed after optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17640
What |Old Value |New Value
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
` (5 preceding siblings ...)
2005-07-12 0:02 ` pinskia at gcc dot gnu dot org
@ 2005-07-15 17:15 ` pinskia at gcc dot gnu dot org
2005-07-27 13:46 ` cvs-commit at gcc dot gnu dot org
2005-07-27 13:56 ` pinskia at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-15 17:15 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-15 17:01 -------
Patch posted here: <http://gcc.gnu.org/ml/gcc-patches/2005-07/msg01038.html>.
--
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://gcc.gnu.org/ml/gcc-
| |patches/2005-
| |07/msg01038.html
Keywords| |patch
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
` (6 preceding siblings ...)
2005-07-15 17:15 ` pinskia at gcc dot gnu dot org
@ 2005-07-27 13:46 ` cvs-commit at gcc dot gnu dot org
2005-07-27 13:56 ` pinskia at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-07-27 13:46 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-07-27 13:27 -------
Subject: Bug 22325
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: rakdver@gcc.gnu.org 2005-07-27 13:26:56
Modified files:
gcc : ChangeLog tree-flow.h tree-scalar-evolution.c
tree-ssa-loop-ivopts.c
Log message:
PR tree-optimization/22325
* tree-flow.h (compute_phi_arg_on_exit, force_expr_to_var_cost):
Declare.
* tree-scalar-evolution.c (scev_const_prop): Add generic final
value replacement.
* tree-ssa-loop-ivopts.c (force_expr_to_var_cost): Split from ...
(force_var_cost): ... this function.
(compute_phi_arg_on_exit): Export.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.9563&r2=2.9564
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-flow.h.diff?cvsroot=gcc&r1=2.130&r2=2.131
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-scalar-evolution.c.diff?cvsroot=gcc&r1=2.31&r2=2.32
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-loop-ivopts.c.diff?cvsroot=gcc&r1=2.85&r2=2.86
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/22325] missed optimization in loop
2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
` (7 preceding siblings ...)
2005-07-27 13:46 ` cvs-commit at gcc dot gnu dot org
@ 2005-07-27 13:56 ` pinskia at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-27 13:56 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-27 13:56 -------
Fixed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.1.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22325
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2005-07-27 13:56 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
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2005-07-06 15:18 [Bug tree-optimization/22325] New: missed optimization in loop pinskia at gcc dot gnu dot org
2005-07-06 15:23 ` [Bug tree-optimization/22325] " pinskia at gcc dot gnu dot org
2005-07-07 19:58 ` pinskia at gcc dot gnu dot org
2005-07-07 20:03 ` pinskia at gcc dot gnu dot org
2005-07-07 20:06 ` steven at gcc dot gnu dot org
2005-07-07 20:16 ` pinskia at gcc dot gnu dot org
2005-07-12 0:02 ` pinskia at gcc dot gnu dot org
2005-07-15 17:15 ` pinskia at gcc dot gnu dot org
2005-07-27 13:46 ` cvs-commit at gcc dot gnu dot org
2005-07-27 13:56 ` pinskia at gcc dot gnu dot org
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