Fortran: add IEEE_QUIET_* and IEEE_SIGNALING_* comparisons
Those operations were added to Fortran 2018, and correspond to
well-defined IEEE comparison operations, with defined signaling
semantics for NaNs. All are implemented in terms of GCC expressions and
built-ins, with no library support needed.
gcc/fortran/
* f95-lang.cc (gfc_init_builtin_functions): Add __builtin_iseqsig.
* trans-intrinsic.cc (conv_intrinsic_ieee_comparison): New
function.
(gfc_conv_ieee_arithmetic_function): Handle IEEE comparisons.
gcc/testsuite/
* gfortran.dg/ieee/comparisons_1.f90: New test.
* gfortran.dg/ieee/comparisons_2.f90: New test.
* gfortran.dg/ieee/comparisons_3.F90: New test.
libgfortran/
* ieee/ieee_arithmetic.F90: Add IEEE_QUIET_* and
IEEE_SIGNALING_* functions.