dlaisnan.f (3)  Linux Man Pages
NAME
dlaisnan.f 
SYNOPSIS
Functions/Subroutines
LOGICAL function dlaisnan (DIN1, DIN2)
DLAISNAN tests input for NaN by comparing two arguments for inequality.
Function/Subroutine Documentation
LOGICAL function dlaisnan (double precisionDIN1, double precisionDIN2)
DLAISNAN tests input for NaN by comparing two arguments for inequality.
Purpose:

This routine is not for general use. It exists solely to avoid overoptimization in DISNAN. DLAISNAN checks for NaNs by comparing its two arguments for inequality. NaN is the only floatingpoint 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 wholeprogram optimization may delete this test. The ISNAN functions will be replaced by the correct Fortran 03 intrinsic once the intrinsic is widely available.
Parameters:

DIN1
DIN1 is DOUBLE PRECISION
DIN2DIN2 is DOUBLE PRECISION Two numbers to compare for inequality.
Author:

Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
 September 2012
Definition at line 75 of file dlaisnan.f.
Author
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