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laisnan(3) LAPACK 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.

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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Tue Jan 28 2025 00:54:31 Version 3.12.0