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
