slaisnan()

logical function slaisnan	(	real, intent(in)	SIN1,
		real, intent(in)	SIN2
	)

SLAISNAN tests input for NaN by comparing two arguments for inequality.

Download SLAISNAN + dependencies [TGZ] [ZIP] [TXT]

Purpose:

 This routine is not for general use.  It exists solely to avoid
 over-optimization in SISNAN.

 SLAISNAN checks for NaNs by comparing its two arguments for
 inequality.  NaN is the only floating-point value where NaN != NaN
 returns .TRUE.  To check for NaNs, pass the same variable as both
 arguments.

 A compiler must assume that the two arguments are
 not the same variable, and the test will not be optimized away.
 Interprocedural or whole-program optimization may delete this
 test.  The ISNAN functions will be replaced by the correct
 Fortran 03 intrinsic once the intrinsic is widely available.

Parameters

[in]	SIN1	SIN1 is REAL
[in]	SIN2	SIN2 is REAL Two numbers to compare for inequality.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.