[xmlvm-users] JVM to LLVM or XMLVM to LLVM

[Steve H. <st...@we...>]

Hi Arno et al.,

I'm curious if anyone has considered writing an XMLVM converter to go from
JVM byte code to LLVM?  I have been analyzing the java to c path, then
compiled the resulting C code to LLVM IR code and compared that IR code to
the original JVM bytecode instructions.

On a cursory review of some methods I have found that the IR code generally
contains about 10 times the number of instructions as the corresponding JVM
byte code.  This factor also corresponds closely with the benchmark results
comparing Oracle's JVM to XMLVM (using some JSON parsing tests I have set
up).

I'm thinking that optimal results can probably be attained with there is
roughly a 1 to 1 correspondence between JVM instructions and LLVM
instructions.

It seems to me that XMLVM is well suited for being able to output LLVM, but
I'm sort of just thinking out loud at this point.

Has this been thought of or tried by anyone yet?  Is my goal of seeking a 1
to 1 mapping of JVM instructions to LLVM instructions (or as close as
possible) as a means of performance maximization off base?  Are there
technical reasons why such a conversion either can't be done or would not
be useful?

Thanks for any insight you can provide.

Best regards

Steve

-- 
Steve Hannah
Web Lite Solutions Corp.