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* [Bug java/21044] New: Static class init optimization is broken
@ 2005-04-15 11:31 aph at gcc dot gnu dot org
2005-04-15 11:32 ` [Bug java/21044] " aph at gcc dot gnu dot org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: aph at gcc dot gnu dot org @ 2005-04-15 11:31 UTC (permalink / raw)
To: java-prs
Pre tree-SSA, we did an optimization whereby we only initialized a class once
per method invocation. This optimization was disabled for some reason, and we
now call _Jv_InitClass multiple times.
The worst case is a simple function like this:
public static int Ack(int m, int n) {
return (m == 0) ? (n + 1) : ((n == 0) ? Ack(m-1, 1) :
Ack(m-1, Ack(m, n - 1)));
}
where Jv_InitClass is now called four times, leading to very poor performance.
--
Summary: Static class init optimization is broken
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: java
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: aph at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21044
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug java/21044] Static class init optimization is broken 2005-04-15 11:31 [Bug java/21044] New: Static class init optimization is broken aph at gcc dot gnu dot org @ 2005-04-15 11:32 ` aph at gcc dot gnu dot org 2005-04-15 12:19 ` [Bug java/21044] [4.0/4.1 Regression] " giovannibajo at libero dot it ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: aph at gcc dot gnu dot org @ 2005-04-15 11:32 UTC (permalink / raw) To: java-prs ------- Additional Comments From aph at gcc dot gnu dot org 2005-04-15 11:32 ------- Created an attachment (id=8643) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8643&action=view) You must enter a description for the attachment. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21044 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/21044] [4.0/4.1 Regression] Static class init optimization is broken 2005-04-15 11:31 [Bug java/21044] New: Static class init optimization is broken aph at gcc dot gnu dot org 2005-04-15 11:32 ` [Bug java/21044] " aph at gcc dot gnu dot org @ 2005-04-15 12:19 ` giovannibajo at libero dot it 2005-04-15 13:31 ` pinskia at gcc dot gnu dot org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: giovannibajo at libero dot it @ 2005-04-15 12:19 UTC (permalink / raw) To: java-prs -- What |Removed |Added ---------------------------------------------------------------------------- Summary|Static class init |[4.0/4.1 Regression] Static |optimization is broken |class init optimization is | |broken Target Milestone|--- |4.0.1 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21044 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/21044] [4.0/4.1 Regression] Static class init optimization is broken 2005-04-15 11:31 [Bug java/21044] New: Static class init optimization is broken aph at gcc dot gnu dot org 2005-04-15 11:32 ` [Bug java/21044] " aph at gcc dot gnu dot org 2005-04-15 12:19 ` [Bug java/21044] [4.0/4.1 Regression] " giovannibajo at libero dot it @ 2005-04-15 13:31 ` pinskia at gcc dot gnu dot org 2005-04-16 16:45 ` aph at gcc dot gnu dot org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-04-15 13:31 UTC (permalink / raw) To: java-prs -- What |Removed |Added ---------------------------------------------------------------------------- CC| |pinskia at gcc dot gnu dot | |org Keywords| |missed-optimization http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21044 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/21044] [4.0/4.1 Regression] Static class init optimization is broken 2005-04-15 11:31 [Bug java/21044] New: Static class init optimization is broken aph at gcc dot gnu dot org ` (2 preceding siblings ...) 2005-04-15 13:31 ` pinskia at gcc dot gnu dot org @ 2005-04-16 16:45 ` aph at gcc dot gnu dot org 2005-04-16 16:46 ` aph at gcc dot gnu dot org 2005-04-16 16:57 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: aph at gcc dot gnu dot org @ 2005-04-16 16:45 UTC (permalink / raw) To: java-prs ------- Additional Comments From aph at gcc dot gnu dot org 2005-04-16 16:45 ------- *** This bug has been marked as a duplicate of 12911 *** -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21044 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/21044] [4.0/4.1 Regression] Static class init optimization is broken 2005-04-15 11:31 [Bug java/21044] New: Static class init optimization is broken aph at gcc dot gnu dot org ` (3 preceding siblings ...) 2005-04-16 16:45 ` aph at gcc dot gnu dot org @ 2005-04-16 16:46 ` aph at gcc dot gnu dot org 2005-04-16 16:57 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: aph at gcc dot gnu dot org @ 2005-04-16 16:46 UTC (permalink / raw) To: java-prs ------- Additional Comments From aph at gcc dot gnu dot org 2005-04-16 16:46 ------- This is related to, but not the same as, 12911. -- What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |UNCONFIRMED Resolution|DUPLICATE | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21044 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/21044] [4.0/4.1 Regression] Static class init optimization is broken 2005-04-15 11:31 [Bug java/21044] New: Static class init optimization is broken aph at gcc dot gnu dot org ` (4 preceding siblings ...) 2005-04-16 16:46 ` aph at gcc dot gnu dot org @ 2005-04-16 16:57 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-04-16 16:57 UTC (permalink / raw) To: java-prs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-04-16 16:57 ------- This is a dup of bug 18399, the problem comes from recursively inlining. *** This bug has been marked as a duplicate of 18399 *** -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21044 ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2005-04-16 16:57 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-04-15 11:31 [Bug java/21044] New: Static class init optimization is broken aph at gcc dot gnu dot org 2005-04-15 11:32 ` [Bug java/21044] " aph at gcc dot gnu dot org 2005-04-15 12:19 ` [Bug java/21044] [4.0/4.1 Regression] " giovannibajo at libero dot it 2005-04-15 13:31 ` pinskia at gcc dot gnu dot org 2005-04-16 16:45 ` aph at gcc dot gnu dot org 2005-04-16 16:46 ` aph at gcc dot gnu dot org 2005-04-16 16:57 ` pinskia at gcc dot gnu dot org
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