Re: Fibonacci and performance

[Per Bothner <per at bothner dot com>]

Tom Tromey <tromey@redhat.com> writes:

> Looking at the generated assembly, the only real difference I see is
> the call to _Jv_InitClass in Fib.fib().  In this particular case we're
> paying a pretty big penalty.
> 
> I wonder if inlining the "already initialized" check from
> _Jv_InitClass would help or hurt (due to increased code size).

The only class I can see that needs to be initialized in Fib.fib is
Fib itself, but that has already been initialized - since we're
executing Fib code.  Don't we test for this situation?  If not, it
shouldn't be difficult to add.  Basically, drop calls to _Jv_InitClass
if the class being initiazed is the current class or one of its
super-classes.

Or am I misunderstanding something?
-- 
	--Per Bothner
per@bothner.com   http://www.bothner.com/~per/