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* [Bug target/25287] New: PPC has conditional indirect jumps if ra allocates the a in ctr before the jumps
@ 2005-12-06 21:07 pinskia at gcc dot gnu dot org
2005-12-06 21:09 ` [Bug target/25287] " pinskia at gcc dot gnu dot org
2005-12-23 5:53 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-12-06 21:07 UTC (permalink / raw)
To: gcc-bugs
Code:
int f(void *a, int b)
{
if (b ==1) goto *a;
g();
if (b ==2) goto *a;
g();
return 1
}
This is very minor but I thought it would be cool if GCC could do something
like:
.f:
mflr %r0
cmpwi %cr7,%r4,1
std %r30,-16(%r1)
std %r31,-8(%r1)
mr %r30,%r3
mr %r31,%r4
std %r0,16(%r1)
stdu %r1,-128(%r1)
mtctr %r30
beqctr %cr7,.L3
bl .g
nop
cmpwi %cr7,%r31,2
mtctr %r30
beqctr %cr7,.L3
bl .g
li %r3
blr
.L3:
mtctr %r30
bctr
--
Summary: PPC has conditional indirect jumps if ra allocates the a
in ctr before the jumps
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25287
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/25287] PPC has conditional indirect jumps if ra allocates the a in ctr before the jumps
2005-12-06 21:07 [Bug target/25287] New: PPC has conditional indirect jumps if ra allocates the a in ctr before the jumps pinskia at gcc dot gnu dot org
@ 2005-12-06 21:09 ` pinskia at gcc dot gnu dot org
2005-12-23 5:53 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-12-06 21:09 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2005-12-06 21:09 -------
Ignore the:
.L3:
mtctr %r30
bctr
Part
and "beqctr %cr7,.L3" should have been "beqctr %cr7"
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25287
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/25287] PPC has conditional indirect jumps if ra allocates the a in ctr before the jumps
2005-12-06 21:07 [Bug target/25287] New: PPC has conditional indirect jumps if ra allocates the a in ctr before the jumps pinskia at gcc dot gnu dot org
2005-12-06 21:09 ` [Bug target/25287] " pinskia at gcc dot gnu dot org
@ 2005-12-23 5:53 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-12-23 5:53 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2005-12-23 05:53 -------
Confirmed.
--
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 |2005-12-23 05:53:16
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25287
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-12-23 5:53 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2005-12-06 21:07 [Bug target/25287] New: PPC has conditional indirect jumps if ra allocates the a in ctr before the jumps pinskia at gcc dot gnu dot org
2005-12-06 21:09 ` [Bug target/25287] " pinskia at gcc dot gnu dot org
2005-12-23 5:53 ` pinskia at gcc dot gnu dot org
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