Man page - laisnan(3)

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Manual

laisnan

NAME
SYNOPSIS
Functions
Detailed Description
Function Documentation
logical function dlaisnan (double precision, intent(in) din1, doubleprecision, intent(in) din2)
logical function slaisnan (real, intent(in) sin1, real, intent(in) sin2)
Author

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, doubleprecision, 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.

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.

Author

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