Hi all,
This is slightly tangential to the current discussion on unnecessary type
checks - does anyone have any good links to information about the JIT
optimisations performed by Hotspot? One question I've been interested in
recently is how well it can optimise Clojure function calls. The compiled
classes of Clojure fns cache references to the vars of functions that they
call with the bytecode equivalent of:
private static Var const__0 = RT.var("namespace", "var")
and the calls are like:
((IFn) const__0.getRawRoot()).invoke(args)
for non-dynamic bindings (the default from 1.3+ IIRC), and
((IFn) const__0.get()).invoke(args)
Does anyone know if Hotspot is capable of optimising these calls? Another
question would be why in the non-dynamic case the IFn contained in the var
is not cached since the root binding should never be modified. Is this just
to support alter-var-root, or is it to support declare'd vars which may not
contain an IFn at compilation time? I would imagine that Hotspot would
optimise this case much better since this mimics what objects in Java tend
to do.
Cheers,
Colin
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