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* [Bug tree-optimization/18438] vectorizer failed for vector matrix multiplication
[not found] <bug-18438-253@http.gcc.gnu.org/bugzilla/>
@ 2006-09-19 7:10 ` irar at il dot ibm dot com
2007-01-05 0:37 ` giovannibajo at libero dot it
2007-01-07 7:40 ` irar at il dot ibm dot com
2 siblings, 0 replies; 8+ messages in thread
From: irar at il dot ibm dot com @ 2006-09-19 7:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from irar at il dot ibm dot com 2006-09-19 07:10 -------
> t.c:20: note: not vectorized: mixed data-types
> t.c:20: note: can't determine vectorization factor.
>
> Removing flags[i] = true;
Multiple data-types vectorization is already supported in the autovect branch,
and the patches for mainline (starting from
http://gcc.gnu.org/ml/gcc-patches/2006-02/msg00941.html) will be committed as
soon as 4.3 is open.
> we get:
> t.c:20: note: not consecutive access
> t.c:20: note: not vectorized: complicated access pattern.
Vectorization of strided accesses is also already implemented in the autovect
branch (and will be committed to the mainline 4.3). However, this case contains
stores with gaps (stores to opoints[i][0], opoints[i][1], and opoints[i][2],
without a store to opoints[i][3]), and only loads with gaps are currently
supported.
Therefore, this loop will be vectorizable in the autovect branch (and soon in
the mainline 4.3) if a store to opoints[i][3] is added.
Ira
--
irar at il dot ibm dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |irar at il dot ibm dot com
Last reconfirmed|2005-12-21 03:49:03 |2006-09-19 07:10:15
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18438
^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug tree-optimization/18438] vectorizer failed for vector matrix multiplication
[not found] <bug-18438-253@http.gcc.gnu.org/bugzilla/>
2006-09-19 7:10 ` irar at il dot ibm dot com
@ 2007-01-05 0:37 ` giovannibajo at libero dot it
2007-01-07 7:40 ` irar at il dot ibm dot com
2 siblings, 0 replies; 8+ messages in thread
From: giovannibajo at libero dot it @ 2007-01-05 0:37 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from giovannibajo at libero dot it 2007-01-05 00:37 -------
Thanks Ira. What about store with gaps?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18438
^ permalink raw reply [flat|nested] 8+ messages in thread* [Bug tree-optimization/18438] vectorizer failed for vector matrix multiplication
[not found] <bug-18438-253@http.gcc.gnu.org/bugzilla/>
2006-09-19 7:10 ` irar at il dot ibm dot com
2007-01-05 0:37 ` giovannibajo at libero dot it
@ 2007-01-07 7:40 ` irar at il dot ibm dot com
2 siblings, 0 replies; 8+ messages in thread
From: irar at il dot ibm dot com @ 2007-01-07 7:40 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from irar at il dot ibm dot com 2007-01-07 07:40 -------
On the todo list.
BTW, vectorization of strided accesses was committed to the mainline 4.3.
Ira
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18438
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/18438] New: vectorizer failed for vector matrix multiplication
@ 2004-11-12 1:29 giovannibajo at libero dot it
2004-11-12 2:43 ` [Bug tree-optimization/18438] " pinskia at gcc dot gnu dot org
2005-09-20 17:47 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 8+ messages in thread
From: giovannibajo at libero dot it @ 2004-11-12 1:29 UTC (permalink / raw)
To: gcc-bugs
Vectorizer fails to handle this:
------------------------------------------------------------
#define NUMPOINTS 50000
#define align(x) __attribute__((align(x)))
typedef float align(16) MATRIX[3][3];
static float points[NUMPOINTS][4];
static align(16) float opoints[NUMPOINTS][4];
static bool flags[NUMPOINTS];
static MATRIX gmatrix;
void RotateVectors (void)
{
int i, r;
for (r = 0; r < 4; r++)
{
for (i = 0; i < NUMPOINTS; i++)
{
opoints[i][0] = gmatrix[0][0] * points[i][0]
+ gmatrix[0][1] * points[i][1]
+ gmatrix[0][2] * points[i][2];
opoints[i][1] = gmatrix[1][0] * points[i][0]
+ gmatrix[1][1] * points[i][1]
+ gmatrix[1][2] * points[i][2];
opoints[i][2] = gmatrix[2][0] * points[i][0]
+ gmatrix[2][1] * points[i][1]
+ gmatrix[2][2] * points[i][2];
flags[i] = true;
}
}
}
------------------------------------------------------------
loop at bench.cc:52: not vectorized: complicated access pattern.
loop at bench.cc:52: bad data access.
--
Summary: vectorizer failed for vector matrix multiplication
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: giovannibajo at libero dot it
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18438
^ permalink raw reply [flat|nested] 8+ messages in thread
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[not found] <bug-18438-4@http.gcc.gnu.org/bugzilla/>
2011-05-22 16:19 ` [Bug tree-optimization/18438] vectorizer failed for vector matrix multiplication steven at gcc dot gnu.org
2012-07-13 8:43 ` rguenth at gcc dot gnu.org
2013-03-27 11:27 ` rguenth at gcc dot gnu.org
[not found] <bug-18438-253@http.gcc.gnu.org/bugzilla/>
2006-09-19 7:10 ` irar at il dot ibm dot com
2007-01-05 0:37 ` giovannibajo at libero dot it
2007-01-07 7:40 ` irar at il dot ibm dot com
2004-11-12 1:29 [Bug tree-optimization/18438] New: " giovannibajo at libero dot it
2004-11-12 2:43 ` [Bug tree-optimization/18438] " pinskia at gcc dot gnu dot org
2005-09-20 17:47 ` pinskia at gcc dot gnu dot org
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