mini-gmp mpz_{get,set}_d not fully compatible with GMP

[Marc Glisse]

On Fri, 9 Mar 2018, Torbjörn Granlund wrote:

>  For GMP, it's desirable to fix also the non IEEE-version.
>
> That would have some value, I suppose, although non-IEEE formats of
> course have become largely obsolete.

This code is mostly used not for non-IEEE formats, but for cases where we 
fail to detect that it *is* IEEE. For instance when compiling to bitcode 
(gcc LTO, LLVM, webassembly, etc). Of course, better IEEE detection would 
help those more than fixing the fallback path.

-- 
Marc Glisse