[Bug target/70117] ppc long double isinf() is wrong?

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70117

--- Comment #13 from Michael Meissner <meissner at gcc dot gnu.org> ---
In gcc/builtins.c it is probably better to use:

const struct real_format *fmt = FLOAT_MODE_FORMAT (mode);
if (fmt == &ibm_extended_double)
  {
    // ...
  }