24.7 Floating-Point

ISO Standard:	“The accuracy of the floating-point operations and of the library functions in <math.h> and <complex.h> that return floating-point results (C90 and C99 5.2.4.2.2).”
Implementation:	The accuracy is unknown.
ISO Standard:	“The accuracy of the conversions between floating-point internal representations and string representations performed by the library functions in <stdio.h>, <stdlib.h>, and <wchar.h> (C90 and C99 5.2.4.2.2).”
Implementation:	The accuracy is unknown.
ISO Standard:	“The rounding behaviors characterized by non-standard values of FLT_ROUNDS (C90 and C99 5.2.4.2.2).”
Implementation:	No such values are used.
ISO Standard:	“The evaluation methods characterized by non-standard negative values of FLT_EVAL_METHOD (C90 and C99 5.2.4.2.2).”
Implementation:	No such values are used.
ISO Standard:	“The direction of rounding when an integer is converted to a floating-point number that cannot exactly represent the original value (C90 6.2.1.3, C99 6.3.1.4).”
Implementation:	C99 Annex F is followed.
ISO Standard:	“The direction of rounding when a floating-point number is converted to a narrower floating-point number (C90 6.2.1.4, 6.3.1.5).”
Implementation:	C99 Annex F is followed.
ISO Standard:	“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 (C90 6.1.3.1, C99 6.4.4.2).”
Implementation:	C99 Annex F is followed.
ISO Standard:	“Whether and how floating expressions are contracted when not disallowed by the FP_CONTRACT pragma (C99 6.5).”
Implementation:	The pragma is not implemented.
ISO Standard:	“The default state for the FENV_ACCESS pragma (C99 7.6.1).”
Implementation:	This pragma is not implemented.
ISO Standard:	“Additional floating-point exceptions, rounding modes, environments, and classifications, and their macro names (C99 7.6, 7.12).”
Implementation:	None supported.
ISO Standard:	“The default state for the FP_CONTRACT pragma (C99 7.12.2).”
Implementation:	This pragma is not implemented.
ISO Standard:	“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 (C99 F.9).”
Implementation:	Unknown.
ISO Standard:	“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 (C99 F.9).”
Implementation:	Unknown.

ISO Standard:

“The accuracy of the floating-point operations and of the library functions in <math.h> and <complex.h> that return floating-point results (C90 and C99 5.2.4.2.2).”

Implementation:

The accuracy is unknown.

ISO Standard:

“The accuracy of the conversions between floating-point internal representations and string representations performed by the library functions in <stdio.h>, <stdlib.h>, and <wchar.h> (C90 and C99 5.2.4.2.2).”

Implementation:

The accuracy is unknown.

ISO Standard:

“The rounding behaviors characterized by non-standard values of FLT_ROUNDS (C90 and C99 5.2.4.2.2).”

Implementation:

No such values are used.

ISO Standard:

“The evaluation methods characterized by non-standard negative values of FLT_EVAL_METHOD (C90 and C99 5.2.4.2.2).”

Implementation:

No such values are used.

ISO Standard:

“The direction of rounding when an integer is converted to a floating-point number that cannot exactly represent the original value (C90 6.2.1.3, C99 6.3.1.4).”

Implementation:

C99 Annex F is followed.

ISO Standard:

“The direction of rounding when a floating-point number is converted to a narrower floating-point number (C90 6.2.1.4, 6.3.1.5).”

Implementation:

C99 Annex F is followed.

ISO Standard:

“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 (C90 6.1.3.1, C99 6.4.4.2).”

Implementation:

C99 Annex F is followed.

ISO Standard:

“Whether and how floating expressions are contracted when not disallowed by the FP_CONTRACT pragma (C99 6.5).”

Implementation:

The pragma is not implemented.

ISO Standard:

“The default state for the FENV_ACCESS pragma (C99 7.6.1).”

Implementation:

This pragma is not implemented.

ISO Standard:

“Additional floating-point exceptions, rounding modes, environments, and classifications, and their macro names (C99 7.6, 7.12).”

Implementation:

None supported.

ISO Standard:

“The default state for the FP_CONTRACT pragma (C99 7.12.2).”

Implementation:

This pragma is not implemented.

ISO Standard:

“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 (C99 F.9).”

Implementation:

Unknown.

ISO Standard:

“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 (C99 F.9).”

Implementation:

Unknown.