[Bug fortran/106579] ieee_signaling_nan problem in fortran on powerpc64

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106579

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 53438
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53438&action=edit
gcc13-builtin-issignaling.patch

Current WIP on the __builtin_issignaling.
Still need to look at decimal arguments (if we need/want to deal with those)
and add i386 issignalingxf2 optab so that it also handles pseudo numbers and
add test coverage.