[The accuracy of the floating-point operations and of the library
functions in `<math.h>` and `<complex.h>` that return floating-point
results (5.2.4.2.2).]

[The rounding behaviors characterized by non-standard values
of `FLT_ROUNDS`
(5.2.4.2.2).]

[The evaluation methods characterized by non-standard negative
values of `FLT_EVAL_METHOD` (5.2.4.2.2).]

[The direction of rounding when an integer is converted to a
floating-point number that cannot exactly represent the original
value (6.3.1.4).]

[The direction of rounding when a floating-point number is
converted to a narrower floating-point number (6.3.1.5).]

[How the nearest representable value or the larger or smaller
representable value immediately adjacent to the nearest representable
value is chosen for certain floating constants (6.4.4.2).]

[Whether and how floating expressions are contracted when not
disallowed by the `FP_CONTRACT` pragma (6.5).]

[The default state for the `FENV_ACCESS` pragma (7.6.1).]

[Additional floating-point exceptions, rounding modes, environments,
and classifications, and their macro names (7.6, 7.12).]

[The default state for the `FP_CONTRACT` pragma (7.12.2).]

[Whether the "inexact" floating-point exception can be raised
when the rounded result actually does equal the mathematical result
in an IEC 60559 conformant implementation (F.9).]

[Whether the "underflow" (and "inexact") floating-point
exception can be raised when a result is tiny but not inexact in an
IEC 60559 conformant implementation (F.9).]