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* [Bug tree-optimization/26745] New: Simple loop is no longer vectorized
@ 2006-03-18 14:07 micis at gmx dot de
2006-03-18 14:48 ` [Bug tree-optimization/26745] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: micis at gmx dot de @ 2006-03-18 14:07 UTC (permalink / raw)
To: gcc-bugs
The gcc40 was able to vetorize the simple program given below, gcc41 and gcc42
are failing to vectorize with the message:
novect.cpp:21: note: not vectorized: can't determine dependence between
A_4->X[f_9] and C_8->X[f_9]
novect.cpp:21: note: vectorized 0 loops in function.
Michael Cieslinski
<novect.cpp>
struct S
{
enum {count = 40};
typedef struct { double X[count]; } __attribute__(( aligned(16) )) DblAli;
struct {double X[count];} aaa __attribute__(( aligned(16) ));
struct {double X[count];} bbb __attribute__(( aligned(16) ));
struct {double X[count];} ccc __attribute__(( aligned(16) ));
void Func ();
} __attribute__(( aligned(16) ));
void S::Func ()
{
DblAli* __restrict__ A = (DblAli*)(&aaa.X[0]);
DblAli* __restrict__ B = (DblAli*)(&bbb.X[0]);
DblAli* __restrict__ C = (DblAli*)(&ccc.X[0]);
for (int f=0; f<count; f++)
{
(*C).X[f] = (*A).X[f] * (*B).X[f];
}
}
--
Summary: Simple loop is no longer vectorized
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: micis at gmx dot de
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26745
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/26745] Simple loop is no longer vectorized
2006-03-18 14:07 [Bug tree-optimization/26745] New: Simple loop is no longer vectorized micis at gmx dot de
@ 2006-03-18 14:48 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-03-18 14:48 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2006-03-18 14:48 -------
*** This bug has been marked as a duplicate of 21591 ***
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26745
^ permalink raw reply [flat|nested] 2+ messages in thread
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2006-03-18 14:07 [Bug tree-optimization/26745] New: Simple loop is no longer vectorized micis at gmx dot de
2006-03-18 14:48 ` [Bug tree-optimization/26745] " pinskia at gcc dot gnu dot org
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