Hi,
I know this is a strange mail and also off topic but since there is no
user-list I'll simply post my stuff here 
I wanted to say a big thank-you for developing llvm, I've always been
fascinated by agressive optimizing frameworks like JVMs and other
virtual machines and was a bit sad that the gnu-world relies(d) on
techniques which have more or less reached their possibilities.
Although I would call myself an end-user developer, its great to see
people working on such cool stuff 
lg Clemens
PS: One things about which I was not able to find information is
wether llvm is also able to do optimistic compilation/decompilation
and wether its able to optimize virtual method calls.
I wanted to say a big thank-you for developing llvm, I've always been
fascinated by agressive optimizing frameworks like JVMs and other
virtual machines and was a bit sad that the gnu-world relies(d) on
techniques which have more or less reached their possibilities.
Although I would call myself an end-user developer, its great to see
people working on such cool stuff
we're glad it's interesting and useful!
PS: One things about which I was not able to find information is
wether llvm is also able to do optimistic compilation/decompilation
and wether its able to optimize virtual method calls.
LLVM does simple devirtualization through pointer analysis, but doesn't have a dedicated pass for it. I'm not sure what "optimistic compilation/decompilation" means without more context, but LLVM can lazily JIT functions, and those functions can be optimized when JIT'd. Once JIT'd, the code can be replaced with a modified (e.g. optimized again, or potentially totally different) functions.
-Chris