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slaisnan.f(3) LAPACK slaisnan.f(3)

NAME

slaisnan.f -

SYNOPSIS

Functions/Subroutines


LOGICAL function slaisnan (SIN1, SIN2)
SLAISNAN tests input for NaN by comparing two arguments for inequality.

Function/Subroutine Documentation

LOGICAL function slaisnan (realSIN1, realSIN2)

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.

Date:

September 2012

Definition at line 75 of file slaisnan.f.

Author

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Tue Sep 25 2012 Version 3.4.2