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* [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
@ 2005-02-11 19:29 pinskia at gcc dot gnu dot org
2005-02-11 19:38 ` [Bug tree-optimization/19905] " pinskia at gcc dot gnu dot org
` (6 more replies)
0 siblings, 7 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-02-11 19:29 UTC (permalink / raw)
To: gcc-bugs
The following two functions should be the same (note don't compile with -ffast-math or even -fno-
math-errno as sqrt is marked as pure)
#define NUMPOINTS 20
float opoints[NUMPOINTS];
double sqrt (double);
void NormalizeVectors (void)
{
int i, r;
float s, x, y, z;
static float d = 0.0;
d += 0.2f;
if (d > 4)
d = 0.0;
for (i=0; i<NUMPOINTS; i++)
{
opoints[i] = sqrt (d);
}
}
void NormalizeVectors1 (void)
{
int i, r;
float s, x, y, z;
static float d = 0.0;
d += 0.2f;
if (d > 4)
d = 0.0;
s = d;
for (i=0; i<NUMPOINTS; i++)
{
opoints[i] = sqrt (s);
}
}
--
Summary: Extra V_MAY_DEF on a static variable whose address is
not taken (we should be able to move the load out of the
loop)
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization
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=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
@ 2005-02-11 19:38 ` pinskia at gcc dot gnu dot org
2005-02-20 19:30 ` pinskia at gcc dot gnu dot org
` (5 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-02-11 19:38 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
OtherBugsDependingO| |18439
nThis| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
2005-02-11 19:38 ` [Bug tree-optimization/19905] " pinskia at gcc dot gnu dot org
@ 2005-02-20 19:30 ` pinskia at gcc dot gnu dot org
2005-05-08 17:40 ` pinskia at gcc dot gnu dot org
` (4 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-02-20 19:30 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-20 14:12 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2005-02-20 14:12:07
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
2005-02-11 19:38 ` [Bug tree-optimization/19905] " pinskia at gcc dot gnu dot org
2005-02-20 19:30 ` pinskia at gcc dot gnu dot org
@ 2005-05-08 17:40 ` pinskia at gcc dot gnu dot org
2005-07-17 20:35 ` pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-05-08 17:40 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-05-08 17:40 -------
oh, why is d considered call clobbered when it cannot be:
Variable: d.0, UID 0, float
Variable: d, UID 1, float, is global, call clobbered, default def: d_4
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |dnovillo at gcc dot gnu dot
| |org
Last reconfirmed|2005-04-16 17:04:43 |2005-05-08 17:40:26
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
` (2 preceding siblings ...)
2005-05-08 17:40 ` pinskia at gcc dot gnu dot org
@ 2005-07-17 20:35 ` pinskia at gcc dot gnu dot org
2005-07-17 20:55 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-17 20:35 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-17 20:34 -------
This is not fixed Kenny's promote statics, in fact we now produce worse code at -O3. Note on ppc-
darwin the code is fine since -fno-math-errno is done by default.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
` (3 preceding siblings ...)
2005-07-17 20:35 ` pinskia at gcc dot gnu dot org
@ 2005-07-17 20:55 ` pinskia at gcc dot gnu dot org
2005-07-19 20:00 ` pinskia at gcc dot gnu dot org
2005-08-23 16:52 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-17 20:55 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-17 20:52 -------
(In reply to comment #3)
> This is not fixed Kenny's promote statics, in fact we now produce worse code at -O3. Note on ppc-
> darwin the code is fine since -fno-math-errno is done by default.
I filed that as PR 22532.
--
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |22532
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
` (4 preceding siblings ...)
2005-07-17 20:55 ` pinskia at gcc dot gnu dot org
@ 2005-07-19 20:00 ` pinskia at gcc dot gnu dot org
2005-08-23 16:52 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-19 20:00 UTC (permalink / raw)
To: gcc-bugs
--
Bug 19905 depends on bug 22532, which changed state.
Bug 22532 Summary: [4.1 Regression] We produce worse code on the mainline for a loop
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22532
What |Old Value |New Value
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
` (5 preceding siblings ...)
2005-07-19 20:00 ` pinskia at gcc dot gnu dot org
@ 2005-08-23 16:52 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-08-23 16:52 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-23 16:40 -------
I think the FIXME in tree-ssa-operands.c is the answer here:
/* FIXME - if we have better information from the static vars
analysis, we need to make the cache call site specific. This way
we can have the performance benefits even if we are doing good
optimization. */
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19905] Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop)
[not found] <bug-19905-4@http.gcc.gnu.org/bugzilla/>
@ 2014-03-13 10:52 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-03-13 10:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19905
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Long fixed.
^ permalink raw reply [flat|nested] 9+ messages in thread
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2005-02-11 19:29 [Bug tree-optimization/19905] New: Extra V_MAY_DEF on a static variable whose address is not taken (we should be able to move the load out of the loop) pinskia at gcc dot gnu dot org
2005-02-11 19:38 ` [Bug tree-optimization/19905] " pinskia at gcc dot gnu dot org
2005-02-20 19:30 ` pinskia at gcc dot gnu dot org
2005-05-08 17:40 ` pinskia at gcc dot gnu dot org
2005-07-17 20:35 ` pinskia at gcc dot gnu dot org
2005-07-17 20:55 ` pinskia at gcc dot gnu dot org
2005-07-19 20:00 ` pinskia at gcc dot gnu dot org
2005-08-23 16:52 ` pinskia at gcc dot gnu dot org
[not found] <bug-19905-4@http.gcc.gnu.org/bugzilla/>
2014-03-13 10:52 ` rguenth at gcc dot gnu.org
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