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laisnan(3) Library Functions Manual laisnan(3)

NAME

laisnan - laisnan: test for NaN, unoptimized

SYNOPSIS

Functions


logical function DLAISNAN (din1, din2)
DLAISNAN tests input for NaN by comparing two arguments for inequality. logical function SLAISNAN (sin1, sin2)
SLAISNAN tests input for NaN by comparing two arguments for inequality.

Detailed Description

Function 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.

logical function SLAISNAN (real, intent(in) sin1, real, intent(in) sin2)

SLAISNAN 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 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

SIN1 

!>          SIN1 is REAL
!>

SIN2

!>          SIN2 is REAL
!>          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 slaisnan.f.

Author

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