fpclassify()

Arguments:

x

A floating-point value.

Library:

libm

The general-purpose math library.

libm-sve

A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

• If you want only selected processes to run with the SVE version, you can include both libraries in your OS image and use the -l m or -l m-sve option to qcc to link explicitly against the appropriate one.
• If you want all processes to use the SVE version, include libm-sve.so in your OS image and set up a symbolic link from libm.so to libm-sve.so. Use the -l m option to qcc to link against the library.

Description:

The fpclassify() macro categorizes the given value as one of the following:

FP_NORMAL

The value is normal, i.e., not an infinity, subnormal, not-a-number or zero.

FP_SUBNORMAL

The value is subnormal.

FP_ZERO

The value is positive or negative zero.

FP_INFINITE

The value is not representable by the underlying type (positive or negative infinity).

FP_NAN

The value is not-a-number (NaN).

Returns:

The category of the number.

Classification:

C11, POSIX 1003.1