A fast JSON serializer
Another idea from the JVM Summit, because the JDK9 now uses fast string concatenation by default, a JSON serializer based on reflection can be outperformed by a hand written code. The following code is a small JSON serializer that use the StringConcatFactory of JDK9 https://gist.github.com/forax/76124b69631475105f87ddd2205a4d91 enjoy, Rémi ___ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
Making the loop combinator fast !
One idea i've got during the JVM Summit, here is a code that implements the Stream.filter/map/reduce operations using the new loop method handle, https://gist.github.com/forax/b5257dfac85e74335e02b5a6b95c9182 Currently, the code that use method handles is far slower than the java.util.stream.Stream equivalent, so the challenge is how to make it perform better. Maybe, it means we should introduce a special method handle combiner/something else that explicit ask for compiling to bytecode + JITing a method handle. cheers, Rémi ___ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
MethodHandle loop body parameters and Stream.reduce accumulator parameters are not in the same order
Hi everybody, i've just found that the parameters of the body (a MethodHandle) of MethodHandles.countedLoop (both overloads) and iteratedLoop are not in the same order as the accumulator in methods Stream.reduce, given that they conceptually represent the same thing, i think the first two parameters of body should be swapped in countedLoop and iteratedLoop. in Stream: U reduce(U identity, BiFunction accumulator, BinaryOperator combiner) so this is equivalent to value = accumulator(value, element) In MethodHandles: MethodHandle iteratedLoop(MethodHandle iterator, MethodHandle init, MethodHandle body) with value = body(element, value, iterable) it should be value = body(value, element, iterable). Same things for MethodHandle countedLoop(MethodHandle start, MethodHandle end, MethodHandle init, MethodHandle body) it should be value = body(value, index, array); instead of value = body(index, value, array); the other loop combinators do not be to be changed. cheers, Rémi ___ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
