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* [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares
[not found] <bug-19703-7648@http.gcc.gnu.org/bugzilla/>
@ 2005-11-04 15:36 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-11-04 15:36 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from pinskia at gcc dot gnu dot org 2005-11-04 15:36 -------
Since this is only a missed optimization, closing as fixed for 4.1.0.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|4.0.3 |4.1.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19703
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares
2005-01-30 2:59 [Bug c/19703] New: Poor optimisation of loop test andrewhutchinson at cox dot net
` (3 preceding siblings ...)
2005-08-17 12:43 ` pinskia at gcc dot gnu dot org
@ 2005-09-27 16:12 ` mmitchel at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2005-09-27 16:12 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.0.2 |4.0.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19703
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares
2005-01-30 2:59 [Bug c/19703] New: Poor optimisation of loop test andrewhutchinson at cox dot net
` (2 preceding siblings ...)
2005-02-10 23:46 ` pinskia at gcc dot gnu dot org
@ 2005-08-17 12:43 ` pinskia at gcc dot gnu dot org
2005-09-27 16:12 ` mmitchel at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-08-17 12:43 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-17 12:37 -------
This has been fixed on the mainline now.
--
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |4.0.0
Known to work| |3.4.0 4.1.0
Summary|[4.0/4.1 Regression] Poor |[4.0 Regression] Poor
|optimisation of loop test, |optimisation of loop test,
|DOM causing unsigned to int |DOM causing unsigned to int
|and missing combine compares|and missing combine compares
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19703
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares
2005-01-30 2:59 [Bug c/19703] New: Poor optimisation of loop test andrewhutchinson at cox dot net
2005-01-30 5:25 ` [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares pinskia at gcc dot gnu dot org
2005-01-30 19:20 ` pinskia at gcc dot gnu dot org
@ 2005-02-10 23:46 ` pinskia at gcc dot gnu dot org
2005-08-17 12:43 ` pinskia at gcc dot gnu dot org
2005-09-27 16:12 ` mmitchel at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-02-10 23:46 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-10 21:04 -------
Lowering the priority as IV-OPTs has worked around DOM's problems.
--
What |Removed |Added
----------------------------------------------------------------------------
Priority|P2 |P3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19703
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares
2005-01-30 2:59 [Bug c/19703] New: Poor optimisation of loop test andrewhutchinson at cox dot net
2005-01-30 5:25 ` [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares pinskia at gcc dot gnu dot org
@ 2005-01-30 19:20 ` pinskia at gcc dot gnu dot org
2005-02-10 23:46 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-01-30 19:20 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-30 19:20 -------
Even though DOM is the problem, IV-OPTS can be improved so we don't create the casts in the first
place, patch here to do that: <http://gcc.gnu.org/ml/gcc-patches/2005-01/msg02209.html>.
I will try get a testcase where DOM messes up even without IV-OPTs doing anything.
And here is that testcase, yes it is werid for someone to do this but ...:
extern void foo6(int);
void testloop6 (void)
{
unsigned int D1133;
int i;
i = 100;
do {
foo6 (i);
i = ((unsigned int) i) + 4294967286U;
}while (i != 0);
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19703
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares
2005-01-30 2:59 [Bug c/19703] New: Poor optimisation of loop test andrewhutchinson at cox dot net
@ 2005-01-30 5:25 ` pinskia at gcc dot gnu dot org
2005-01-30 19:20 ` pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-01-30 5:25 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-30 05:25 -------
Confirmed (sorry about that I was thinking of something different at the time).
Here is a better example for normal targets (PPC and x86 too):
extern void foo6(int);
void testloop6 (void)
{
int i;
i = 100;
do {
foo6 ( i);
i-=10;
} while (i != 0);
}
The tree dump for the loop on x86:
<L0>:;
foo6 (i);
D.1592 = (unsigned int) i + 0fffffff6;
i = (int) D.1592;
if (D.1592 != 0) goto <L0>; else goto <L1>;
Note this is not IV-OPTS messing up but DOM changing the if statement.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
GCC target triplet|avr |
Last reconfirmed|0000-00-00 00:00:00 |2005-01-30 05:25:46
date| |
Summary|Poor optimisation of loop |[4.0 Regression] Poor
|test |optimisation of loop test,
| |DOM causing unsigned to int
| |and missing combine compares
Target Milestone|--- |4.0.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19703
^ permalink raw reply [flat|nested] 6+ messages in thread
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[not found] <bug-19703-7648@http.gcc.gnu.org/bugzilla/>
2005-11-04 15:36 ` [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares pinskia at gcc dot gnu dot org
2005-01-30 2:59 [Bug c/19703] New: Poor optimisation of loop test andrewhutchinson at cox dot net
2005-01-30 5:25 ` [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares pinskia at gcc dot gnu dot org
2005-01-30 19:20 ` pinskia at gcc dot gnu dot org
2005-02-10 23:46 ` pinskia at gcc dot gnu dot org
2005-08-17 12:43 ` pinskia at gcc dot gnu dot org
2005-09-27 16:12 ` mmitchel at gcc dot gnu dot org
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