NAME

SRC/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.

Definition at line 73 of file dlaisnan.f.

Author

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