isunordered man page on SmartOS

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```isunordered(3M)		Mathematical Library Functions	       isunordered(3M)

NAME
isunordered - test if arguments are unordered

SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

int isunordered(real-floating x, real-floating y);

DESCRIPTION
The isunordered() macro determines whether its arguments are unordered.

RETURN VALUES
Upon  successful	 completion,  the isunordered() macro returns 1 if its
arguments are unordered and 0 otherwise.

ERRORS
No errors are defined.

USAGE
The relational and equality operators support  the  usual  mathematical
relationships  between  numeric values. For any ordered pair of numeric
values, exactly one of the relationships (less, greater, and equal)  is
true.  Relational operators can raise the invalid floating-point excep‐
tion when argument values are NaNs. For a NaN and a numeric  value,  or
for  two NaNs, just the unordered relationship is true. This macro is a
quiet (non-floating-point exception raising) version  of	 a  relational
operator. It facilitates writing efficient code that accounts for quiet
NaNs without suffering the invalid  floating-point  exception.  In  the
SYNOPSIS section, real-floating indicates that the argument shall be an
expression of real-floating type.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

┌─────────────────────────────┬─────────────────────────────┐
│      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability	     │Standard			   │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level		     │MT-Safe			   │
└─────────────────────────────┴─────────────────────────────┘

isgreater(3M), isgreaterequal(3M), isless(3M), islessequal(3M), isless‐

SunOS 5.11			  12 Jul 2006		       isunordered(3M)
```
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