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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108698

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Simpler testcase:
template <typename T>
decltype (T () * T () + 1.0) foo ()
{
  return T () * T () + 1.0;
}

void
bar ()
{
  foo <float> ();
  foo <double> ();
  foo <long double> ();
}

The question is if the excess precision should be visible in the mangling in
some way or not.=