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* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning
[not found] <bug-35229-4@http.gcc.gnu.org/bugzilla/>
@ 2012-07-19 11:29 ` rguenth at gcc dot gnu.org
2013-09-26 14:57 ` [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning or PRE rguenth at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-07-19 11:29 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |changpeng.fang at amd dot
| |com
--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-19 11:28:19 UTC ---
*** Bug 43425 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning or PRE
[not found] <bug-35229-4@http.gcc.gnu.org/bugzilla/>
2012-07-19 11:29 ` [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning rguenth at gcc dot gnu.org
@ 2013-09-26 14:57 ` rguenth at gcc dot gnu.org
2013-09-26 14:57 ` rguenth at gcc dot gnu.org
2013-09-26 15:07 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-09-26 14:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ysrumyan at gmail dot com
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 56595 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning or PRE
[not found] <bug-35229-4@http.gcc.gnu.org/bugzilla/>
2012-07-19 11:29 ` [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning rguenth at gcc dot gnu.org
2013-09-26 14:57 ` [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning or PRE rguenth at gcc dot gnu.org
@ 2013-09-26 14:57 ` rguenth at gcc dot gnu.org
2013-09-26 15:07 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-09-26 14:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |snagavallis at outlook dot com
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 57223 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning or PRE
[not found] <bug-35229-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2013-09-26 14:57 ` rguenth at gcc dot gnu.org
@ 2013-09-26 15:07 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-09-26 15:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Still happens for partially loop invariant loads (partially loop invariant as
in blocked by a following aliasing store in the loop body). Like seen in
PR57223.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning
2008-02-17 9:25 [Bug tree-optimization/35229] New: Vectorizer doesn't support dependence created by predictive commoning irar at il dot ibm dot com
` (2 preceding siblings ...)
2009-03-17 13:34 ` irar at il dot ibm dot com
@ 2009-07-22 15:31 ` matz at gcc dot gnu dot org
3 siblings, 0 replies; 8+ messages in thread
From: matz at gcc dot gnu dot org @ 2009-07-22 15:31 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from matz at gcc dot gnu dot org 2009-07-22 15:31 -------
Subject: Bug 35229
Author: matz
Date: Wed Jul 22 15:30:50 2009
New Revision: 149942
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=149942
Log:
PR tree-optimization/35229
PR tree-optimization/39300
* tree-ssa-pre.c (includes): Include tree-scalar-evolution.h.
(inhibit_phi_insertion): New function.
(insert_into_preds_of_block): Call it for REFERENCEs.
(init_pre): Initialize and finalize scalar evolutions.
* Makefile.in (tree-ssa-pre.o): Depend on tree-scalar-evolution.h .
testsuite/
* gcc.dg/vect/vect-pre-interact.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/vect/vect-pre-interact.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-pre.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning
2008-02-17 9:25 [Bug tree-optimization/35229] New: Vectorizer doesn't support dependence created by predictive commoning irar at il dot ibm dot com
2009-02-25 14:13 ` [Bug tree-optimization/35229] " rguenth at gcc dot gnu dot org
2009-02-25 14:33 ` rguenth at gcc dot gnu dot org
@ 2009-03-17 13:34 ` irar at il dot ibm dot com
2009-07-22 15:31 ` matz at gcc dot gnu dot org
3 siblings, 0 replies; 8+ messages in thread
From: irar at il dot ibm dot com @ 2009-03-17 13:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from irar at il dot ibm dot com 2009-03-17 13:33 -------
(In reply to comment #2)
> Or like the following, which is just a bunch of reductions of two elements
> float data[1024];
> void foo(void)
> {
> int i;
> for (i = 1; i < 1024; ++i)
> data[i] = data[i] + data[i-1];
> }
Actually, this loop is not vectorizable. res and data have to be different
arrays, otherwise we get read after write dependence with distance 1.
Ira
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning
2008-02-17 9:25 [Bug tree-optimization/35229] New: Vectorizer doesn't support dependence created by predictive commoning irar at il dot ibm dot com
2009-02-25 14:13 ` [Bug tree-optimization/35229] " rguenth at gcc dot gnu dot org
@ 2009-02-25 14:33 ` rguenth at gcc dot gnu dot org
2009-03-17 13:34 ` irar at il dot ibm dot com
2009-07-22 15:31 ` matz at gcc dot gnu dot org
3 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-02-25 14:33 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from rguenth at gcc dot gnu dot org 2009-02-25 14:33 -------
Or like the following, which is just a bunch of reductions of two elements
float data[1024];
void foo(void)
{
int i;
for (i = 1; i < 1024; ++i)
data[i] = data[i] + data[i-1];
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning
2008-02-17 9:25 [Bug tree-optimization/35229] New: Vectorizer doesn't support dependence created by predictive commoning irar at il dot ibm dot com
@ 2009-02-25 14:13 ` rguenth at gcc dot gnu dot org
2009-02-25 14:33 ` rguenth at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-02-25 14:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2009-02-25 14:12 -------
Indeed. Proper testcase:
float res[1024], data[1024];
void foo(void)
{
int i;
float tmp = data[0];
for (i = 1; i < 1024; ++i)
{
float tmp2 = data[i];
res[i] = tmp + tmp2;
tmp = tmp2;
}
}
manually "optimized" from
res[i] = data[i] + data[i-1];
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu dot
| |org
OtherBugsDependingO| |39300
nThis| |
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-02-25 14:12:51
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35229
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2013-09-26 15:07 UTC | newest]
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[not found] <bug-35229-4@http.gcc.gnu.org/bugzilla/>
2012-07-19 11:29 ` [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning rguenth at gcc dot gnu.org
2013-09-26 14:57 ` [Bug tree-optimization/35229] Vectorizer doesn't support dependence created by predictive commoning or PRE rguenth at gcc dot gnu.org
2013-09-26 14:57 ` rguenth at gcc dot gnu.org
2013-09-26 15:07 ` rguenth at gcc dot gnu.org
2008-02-17 9:25 [Bug tree-optimization/35229] New: Vectorizer doesn't support dependence created by predictive commoning irar at il dot ibm dot com
2009-02-25 14:13 ` [Bug tree-optimization/35229] " rguenth at gcc dot gnu dot org
2009-02-25 14:33 ` rguenth at gcc dot gnu dot org
2009-03-17 13:34 ` irar at il dot ibm dot com
2009-07-22 15:31 ` matz at gcc dot gnu dot org
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