C.1.6 Floating point (J.3.6)

• 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 accuracy of floating point operations is consistent with the settings of FLT_EVAL_METHOD. The accuracy of the library functions in <math.h> and <complex.h> is as specified in the libm(3LIB) man page.

• The rounding behaviors characterized by non-standard values of FLT_ROUNDS (5.2.4.2.2).

  Not applicable to this implementation.

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

  Not applicable to this implementation.

• 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).

  It honors the prevailing rounding direction mode.

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

  It honors the prevailing rounding direction mode.

• 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).

  Floating-point constant is always rounded to the nearest representable value.

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

  Not applicable to this implementation.

• The default state for the FENV_ACCESS pragma (7.6.1).

  For -fsimple=0, the default value is ON. Otherwise for all other values of -fsimple, the default value for FENV_ACCESS is OFF.

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

  Not applicable to this implementation.

• The default state for the FP_CONTRACT pragma (7.12.2).

  For -fsimple=0, the default value is OFF. Otherwise for all other values of -fsimple, the default value for FP_CONTRACT is ON.

• 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).

  Results are indeterminable.

• 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).

  The hardware does not raise underflow or inexact in such cases when trapping on underflow is disabled (the default).