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* [Bug target/32110] New: vector "extract" and then vector "splat" is not optimized
@ 2007-05-27 21:46 pinskia at gcc dot gnu dot org
2007-06-11 22:37 ` [Bug target/32110] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-05-27 21:46 UTC (permalink / raw)
To: gcc-bugs
Testcase:
#define vector __attribute__((vector_size(16) ))
typedef vector int t;
t f(t a)
{
int b = *(int*)&a;
return (vector int){b,b,b,b};
}
----------------- CUT --------
This should just produce :
vspltw v2,v2,0
blr
But right now we do:
_f:
addi r2,r1,-16
stvewx v2,0,r2
lvewx v2,0,r2
vspltw v2,v2,0
blr
Which is not good at all, as it causes a load hit store hazzard to happen on
the Cell and it also causes the dispatch group to be rejected for the
power4/power5/970.
This is related to PR 32107.
--
Summary: vector "extract" and then vector "splat" is not
optimized
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32110
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/32110] vector "extract" and then vector "splat" is not optimized
2007-05-27 21:46 [Bug target/32110] New: vector "extract" and then vector "splat" is not optimized pinskia at gcc dot gnu dot org
@ 2007-06-11 22:37 ` pinskia at gcc dot gnu dot org
2008-02-20 21:35 ` pinskia at gcc dot gnu dot org
2010-03-02 18:34 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-06-11 22:37 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32110
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/32110] vector "extract" and then vector "splat" is not optimized
2007-05-27 21:46 [Bug target/32110] New: vector "extract" and then vector "splat" is not optimized pinskia at gcc dot gnu dot org
2007-06-11 22:37 ` [Bug target/32110] " pinskia at gcc dot gnu dot org
@ 2008-02-20 21:35 ` pinskia at gcc dot gnu dot org
2010-03-02 18:34 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2008-02-20 21:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2008-02-20 21:34 -------
Mine, the PS3 toolchain has patches which fixes this issue.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |pinskia at gcc dot gnu dot
|dot org |org
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2008-02-20 21:34:23
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32110
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/32110] vector "extract" and then vector "splat" is not optimized
2007-05-27 21:46 [Bug target/32110] New: vector "extract" and then vector "splat" is not optimized pinskia at gcc dot gnu dot org
2007-06-11 22:37 ` [Bug target/32110] " pinskia at gcc dot gnu dot org
2008-02-20 21:35 ` pinskia at gcc dot gnu dot org
@ 2010-03-02 18:34 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2010-03-02 18:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2010-03-02 18:34 -------
Hmm, we get worse code now on the trunk:
addi 9,1,-80
li 0,48
stvewx 2,9,0
lwz 0,-32(1)
stw 0,-16(1)
stw 0,-12(1)
stw 0,-8(1)
stw 0,-4(1)
li 0,64
lvx 2,9,0
blr
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|pinskia at gcc dot gnu dot |unassigned at gcc dot gnu
|org |dot org
Status|ASSIGNED |NEW
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32110
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-03-02 18:34 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2007-05-27 21:46 [Bug target/32110] New: vector "extract" and then vector "splat" is not optimized pinskia at gcc dot gnu dot org
2007-06-11 22:37 ` [Bug target/32110] " pinskia at gcc dot gnu dot org
2008-02-20 21:35 ` pinskia at gcc dot gnu dot org
2010-03-02 18:34 ` pinskia at gcc dot gnu dot org
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