Hi, I've been writing an Elsa to LLVM interface. It has been going very well, I think both sets of software are very nice. At this point I've been able to compile and run a small program (sieve.c). I've also compiled a pretty complete version of printf(). (It seemed like a good choice because it touches many data types, varargs, etc.) I've had to make quite a few changes to Elsa to get this going, but so far I haven't had to touch LLVM. I got the current version of LLVM via svn yesterday and modified my code to use the LLVMFoldingBuilder. Very nice! My question is this: I noticed that the folding builder doesn't fold some operations, e.g. casts. Is there some reason why? If I implemented some of these unhandled cases could I sumbit the changes back to the LLVM project? -Rich