[LLVMdev] Argument Lowering

[dag at cray.com]

Duncan Sands <baldrick at free.fr> writes:

> Rather than trying to have LLVM codegen take care of ABI issues (which means
> passing all kinds of extra information in the IR), another possibility is to
> have LLVM provide a helper library for generating correct IR.  You would say
> to the library: my parameter is a union type with these fields (described
> using C/C++ language concepts such as unions, POD etc), and it would tell you
> what IR to output (or output it for you).  This library could then be used by
> clang and every front-end confronted with ABI issues.  There is a bug report
> about this somewhere.

That sounds like an excellent idea.  I am basically at the point of
rewriting our argument handling due to some past sub-optimal design
choices.  I can't promise anything at the moment (gotta go through
corporate) but it would be in my interest to contribute that code to
such a library.

                         -David