[LLVMdev] Instruction lowering pass

[Richard Pennington]

I would like to write a pass to lower a set of LLVM instructions to 
function calls for soft float, etc.

The reason I'd like to do this is that I do bitcode linking of whole 
programs and the support functions and the support functions get 
internalized and eliminated before the instructions that need them are 
lowered.

My idea is to start with a pass based on LowerAllocations.cpp but that 
is set up and used in a way similar to the internalize pass, i.e. with a 
set of opcode/function name pairs to be replaced.

Eventually I'd like to have the target code generators be able to supply 
the names of functions that they'd need to the operation of the pass 
could be more automatic.

Is there interest in something like this? If so, I;ll look into 
extending the code generator interface to supply the information. If not 
I'll make the pass as unobtrusive as possible.

-Rich