Hi all,

Zero's normal and native method entries both call
methodOopDesc::result_type when a method returns without an exception.
I didn't realise, but this parses the method's signature, so is pretty
slow. This webrev makes Zero figure out result types in a similar way
to the x86 and sparc C++ interpreter implementations.

  http://cr.openjdk.java.net/~gbenson/zero-speedup-01/

Some quick and dirty SPECjvm98 numbers (not produced in compliance
with the SPECjvm98 run rules and therefore not comparable with
SPECjvm98 metrics):

                   Old New Speedup
  compress 151.38 136.34 9.9%
  jess 38.81 28.64 26.2%
  db 73.22 59.11 19.3%
  javac 43.10 34.84 19.2%
  mpegaudio 108.47 100.61 7.2%
  mtrt 38.66 29.30 24.2%
  jack 27.68 22.40 19.1%

Cheers,
Gary