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From: "aph at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: java-prs@gcc.gnu.org
Subject: [Bug java/21044] New: Static class init optimization is broken
Date: Fri, 15 Apr 2005 11:31:00 -0000 [thread overview]
Message-ID: <20050415113100.21044.aph@gcc.gnu.org> (raw)
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
next reply other threads:[~2005-04-15 11:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-15 11:31 aph at gcc dot gnu dot org [this message]
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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