dlaisnan.f(3)

Usage

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.

Definition at line 73 of file dlaisnan.f.

Releases

4 releases since Debian 7 (Wheezy); the text changed 3 times.

7
8
9
Arch