IEEE_FEATURES
Index
- NAME
-
- USAGE
-
- SYNOPSIS
-
- DERIVED-TYPE DESCRIPTION
-
- PARAMETER DESCRIPTION
-
- SEE ALSO
-
- BUGS
-
NAME
ieee_features - Intrinsic module for requesting IEEE feature support
USAGE
USE,INTRINSIC :: IEEE_FEATURES [,ONLY:feature [,feature]...]
This module provides a mechanism to request support for particular IEEE
features.
The contents of this module conform to technical report ISO/IEC TR
15580:1998(E).
SYNOPSIS
- Derived Types
-
IEEE_FEATURES_TYPE.
- Parameters
-
IEEE_DATATYPE, IEEE_DENORMAL, IEEE_DIVIDE, IEEE_HALTING, IEEE_INEXACT_FLAG,
IEEE_INF, IEEE_INVALID_FLAG, IEEE_NAN, IEEE_ROUNDING, IEEE_SQRT,
IEEE_UNDERFLOW_FLAG.
DERIVED-TYPE DESCRIPTION
TYPE IEEE_FEATURES_TYPE
PRIVATE
...
END TYPE
-
This type is the type of the named constants exported by this module.
It is provided solely for access to these named constants.
PARAMETER DESCRIPTION
Accessing these parameters (on the USE statement) requests support for the
specified IEEE features. For example,
USE,INTRINSIC :: IEEE_FEATURES,ONLY:IEEE_INF,IEEE_NAN
will cause compilation to fail if the requested features (IEEE infinities and NaNs) cannot be supported. Note that a USE statement
for IEEE_FEATURES with no ONLY clause will request support for all the
possible features.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_DATATYPE
-
Requests IEEE arithmetic support, returning .TRUE. from
IEEE_SUPPORT_DATATYPE(X) for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_DENORMAL
-
Requests support for IEEE denormalised numbers, returning .TRUE. from
IEEE_SUPPORT_DENORMAL(X) for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_DIVIDE
-
Requests support for IEEE division, returning .TRUE. from
IEEE_SUPPORT_DIVIDE(X) for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_HALTING
-
Requests support for changing the halting mode, return .TRUE. from
IEEE_SUPPORT_HALTING for at least one exception flag.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_INEXACT_FLAG
-
Requests support for the inexact exception, returning .TRUE. from
IEEE_SUPPORT_FLAG(IEEE_INEXACT,X) for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_INF
-
Requests support for IEEE infinities, returning .TRUE. from IEEE_SUPPORT_INF(X)
for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_INVALID_FLAG
-
Requests support for the invalid exception, returning .TRUE. from
IEEE_SUPPORT_FLAG(IEEE_INVALID,X) for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_NAN
-
Requests support for IEEE NaNs (Not-a-Number values), returning .TRUE. from
IEEE_SUPPORT_NAN(X) for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_ROUNDING
-
Requests support for dynamic setting of all IEEE rounding modes,
returning .TRUE. from IEEE_SUPPORT_ROUNDING(ROUND_VALUE,X) for all rounding
modes for at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_SQRT
-
Requests support for IEEE sqrt, returning .TRUE. from IEEE_SUPPORT_SQRT for
at least one kind of REAL.
TYPE(IEEE_FEATURES_TYPE),PARAMETER :: IEEE_UNDERFLOW_FLAG
-
Requests support for the underflow exception, returning .TRUE. from
IEEE_SUPPORT_FLAG(IEEE_UNDERFLOW,X) for at least one kind of REAL.
SEE ALSO
f95(1),
ieee_arithmetic(3),
ieee_exceptions(3),
nag_modules(3).
BUGS
Please report any bugs found to "support@nag.co.uk", along with any
suggestions for improvements.
© The Numerical Algorithms Group Ltd, Oxford UK. 2001