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* [Bug rtl-optimization/24082] New: Not that good register allocating on powerpc for vectors
@ 2005-09-27 14:47 pinskia at gcc dot gnu dot org
2005-09-27 14:56 ` [Bug rtl-optimization/24082] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-27 14:47 UTC (permalink / raw)
To: gcc-bugs
Take the following code:
vector int bar3(long long x)
{
return (vector int)(vector long long){x,x};
}
---
Currently we get:
_bar3:
mfspr r0,256
stw r0,-8(r1)
oris r0,r0,0x8000
mtspr 256,r0
addi r2,r1,-32
stw r3,0(r2)
stw r4,4(r2)
stw r3,8(r2)
stw r4,12(r2)
lvx v0,0,r2
lwz r12,-8(r1)
vor v2,v0,v0
mtspr 256,r12
blr
But we should really allocate v0 in v2, removing the save/restore/setting of VRSAVE.
Like:
_bar3:
addi r2,r1,-32
stw r3,0(r2)
stw r4,4(r2)
stw r3,8(r2)
stw r4,12(r2)
lvx v2,0,r2
blr
--
Summary: Not that good register allocating on powerpc for vectors
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: missed-optimization, ra
Severity: enhancement
Priority: P2
Component: rtl-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: powerpc-darwin
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24082
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/24082] Not that good register allocating on powerpc for vectors
2005-09-27 14:47 [Bug rtl-optimization/24082] New: Not that good register allocating on powerpc for vectors pinskia at gcc dot gnu dot org
@ 2005-09-27 14:56 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-27 14:56 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-27 14:56 -------
This is with -maltivec -O2.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24082
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/24082] Not that good register allocating on powerpc for vectors
[not found] <bug-24082-6528@http.gcc.gnu.org/bugzilla/>
2006-02-02 13:53 ` pinskia at gcc dot gnu dot org
@ 2008-09-14 3:23 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2008-09-14 3:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from pinskia at gcc dot gnu dot org 2008-09-14 03:22 -------
This was fixed for 4.3.0 (most likely by the df work).
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.3.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24082
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/24082] Not that good register allocating on powerpc for vectors
[not found] <bug-24082-6528@http.gcc.gnu.org/bugzilla/>
@ 2006-02-02 13:53 ` pinskia at gcc dot gnu dot org
2008-09-14 3:23 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-02-02 13:53 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2006-02-02 13:53 -------
Confirmed, note vector here is a define for __attribute__((vector_size(16)))
and from the include of altivec.h as there is no vector long long in altivec.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2006-02-02 13:53:17
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24082
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2008-09-14 3:23 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-09-27 14:47 [Bug rtl-optimization/24082] New: Not that good register allocating on powerpc for vectors pinskia at gcc dot gnu dot org
2005-09-27 14:56 ` [Bug rtl-optimization/24082] " pinskia at gcc dot gnu dot org
[not found] <bug-24082-6528@http.gcc.gnu.org/bugzilla/>
2006-02-02 13:53 ` pinskia at gcc dot gnu dot org
2008-09-14 3:23 ` pinskia at gcc dot gnu dot org
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