Multiprecision Arithmetic Builtins

[Oleg Endo]

Hi all,

I was thinking of adding some SH specific builtin functions for the
addc, subc and negc instructions.  

Are there any plans to add clang's target independent multiprecision
arithmetic builtins (http://clang.llvm.org/docs/LanguageExtensions.html)
to GCC?

A while ago clang's checked arithmetic builtins were added to GCC.  So
just in case, I wanted to check before introducing target specific
builtins.

Cheers,
Oleg