dlaisnan.f man page

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 precision, intent(in) DIN1, double precision, intent(in) DIN2)

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

Purpose:

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

 DLAISNAN 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:

DIN1

          DIN1 is DOUBLE PRECISION

DIN2

          DIN2 is DOUBLE PRECISION
          Two numbers to compare for inequality.
Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

June 2017

Definition at line 76 of file dlaisnan.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page dlaisnan(3) is an alias of dlaisnan.f(3).

Sat Jun 24 2017 Version 3.7.1 LAPACK