Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 3/31/2023
Public

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Document Table of Contents

IEEE_SUPPORT_NAN

Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE Not-a-Number feature.

Module

USE, INTRINSIC :: IEEE_ARITHMETIC

result = IEEE_SUPPORT_NAN ([x])

x

(Input; optional) Must be of type REAL; it can be scalar or array valued.

Results

The result is a scalar of type default logical. If x is omitted, the result has the value true if the processor supports NaNs for all real values; otherwise, false.

If x is specified, the result has the value true if the processor supports NaNs for real variables of the same kind type parameter as x; otherwise, false.

Example

IEEE_SUPPORT_NAN () has the value true if IEEE NaNs are supported for all real types.