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* [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency
@ 2004-03-30 16:03 rakdver at gcc dot gnu dot org
2004-03-30 16:05 ` [Bug middle-end/14784] " dnovillo at gcc dot gnu dot org
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: rakdver at gcc dot gnu dot org @ 2004-03-30 16:03 UTC (permalink / raw)
To: gcc-bugs
Tree-ssa alias analysis does not take information about structure
fields into account. Consequently head->using_obstack and bitmap_free
accesses in the following testcase are believed to alias, which prevents
further optimizations (load motion, unswitching) on tree level.
typedef struct bitmap_element_def
{
unsigned int indx;
} bitmap_element;
typedef struct bitmap_head_def {
bitmap_element *first;
int using_obstack;
} bitmap_head;
typedef struct bitmap_head_def *bitmap;
bitmap_element *bitmap_free;
void foo (bitmap head, bitmap_element *elt)
{
while (1)
{
if (head->using_obstack)
bitmap_free = elt;
}
}
--
Summary: Tree-ssa alias analysis deficiency
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rakdver at gcc dot gnu dot org
CC: dnovillo at redhat dot com,gcc-bugs at gcc dot gnu dot
org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/14784] Tree-ssa alias analysis deficiency
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
@ 2004-03-30 16:05 ` dnovillo at gcc dot gnu dot org
2004-03-30 16:08 ` pinskia at gcc dot gnu dot org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: dnovillo at gcc dot gnu dot org @ 2004-03-30 16:05 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
CC|dnovillo at redhat dot com |
AssignedTo|unassigned at gcc dot gnu |dnovillo at gcc dot gnu dot
|dot org |org
Status|UNCONFIRMED |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/14784] Tree-ssa alias analysis deficiency
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
2004-03-30 16:05 ` [Bug middle-end/14784] " dnovillo at gcc dot gnu dot org
@ 2004-03-30 16:08 ` pinskia at gcc dot gnu dot org
2004-04-06 1:24 ` [Bug middle-end/14784] [Tree-ssa] " pinskia at gcc dot gnu dot org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-03-30 16:08 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-03-30 16:08 -------
Confirmed, related to bug 13761.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/14784] [Tree-ssa] alias analysis deficiency
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
2004-03-30 16:05 ` [Bug middle-end/14784] " dnovillo at gcc dot gnu dot org
2004-03-30 16:08 ` pinskia at gcc dot gnu dot org
@ 2004-04-06 1:24 ` pinskia at gcc dot gnu dot org
2004-04-06 2:40 ` pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-04-06 1:24 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |pessimizes-code
Summary|Tree-ssa alias analysis |[Tree-ssa] alias analysis
|deficiency |deficiency
Target Milestone|--- |tree-ssa
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug middle-end/14784] [Tree-ssa] alias analysis deficiency
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
` (2 preceding siblings ...)
2004-04-06 1:24 ` [Bug middle-end/14784] [Tree-ssa] " pinskia at gcc dot gnu dot org
@ 2004-04-06 2:40 ` pinskia at gcc dot gnu dot org
2004-05-24 23:30 ` [Bug tree-optimization/14784] " pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-04-06 2:40 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/14784] [Tree-ssa] alias analysis deficiency
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
` (3 preceding siblings ...)
2004-04-06 2:40 ` pinskia at gcc dot gnu dot org
@ 2004-05-24 23:30 ` pinskia at gcc dot gnu dot org
2005-01-13 1:02 ` pinskia at gcc dot gnu dot org
2005-01-20 21:38 ` dberlin at gcc dot gnu dot org
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-24 23:30 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|3.5.0 |---
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/14784] [Tree-ssa] alias analysis deficiency
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
` (4 preceding siblings ...)
2004-05-24 23:30 ` [Bug tree-optimization/14784] " pinskia at gcc dot gnu dot org
@ 2005-01-13 1:02 ` pinskia at gcc dot gnu dot org
2005-01-20 21:38 ` dberlin at gcc dot gnu dot org
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-01-13 1:02 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-13 01:02 -------
This is struct aliasing related so reassigning to Daniel Berlin.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|dnovillo at gcc dot gnu dot |dberlin at gcc dot gnu dot
|org |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/14784] [Tree-ssa] alias analysis deficiency
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
` (5 preceding siblings ...)
2005-01-13 1:02 ` pinskia at gcc dot gnu dot org
@ 2005-01-20 21:38 ` dberlin at gcc dot gnu dot org
6 siblings, 0 replies; 8+ messages in thread
From: dberlin at gcc dot gnu dot org @ 2005-01-20 21:38 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From dberlin at gcc dot gnu dot org 2005-01-20 21:38 -------
You can track the plans and status for structure aliasing on the gcc wiki, at
[[Improved alias analysis]]
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14784
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2005-01-20 21:38 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-03-30 16:03 [Bug middle-end/14784] New: Tree-ssa alias analysis deficiency rakdver at gcc dot gnu dot org
2004-03-30 16:05 ` [Bug middle-end/14784] " dnovillo at gcc dot gnu dot org
2004-03-30 16:08 ` pinskia at gcc dot gnu dot org
2004-04-06 1:24 ` [Bug middle-end/14784] [Tree-ssa] " pinskia at gcc dot gnu dot org
2004-04-06 2:40 ` pinskia at gcc dot gnu dot org
2004-05-24 23:30 ` [Bug tree-optimization/14784] " pinskia at gcc dot gnu dot org
2005-01-13 1:02 ` pinskia at gcc dot gnu dot org
2005-01-20 21:38 ` dberlin at gcc dot gnu dot org
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