[Bug fortran/66311] [5/6 Regression] Problems with some integer(16) values

[mikael at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66311

--- Comment #8 from Mikael Morin <mikael at gcc dot gnu.org> ---
Created attachment 36121
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36121&action=edit
Beginning of a patch

The existing code mixes gmp allocation with wide_int allocation.
With the patch, an extra sign bit needs to be written in the most significant
word.
I don't know how to avoid the memory management nightmare.