dlaisnan.f (3) - Linux Manuals
NAME
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 precisionDIN1, double precisionDIN2)
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
DIN2DIN2 is DOUBLE PRECISION 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 dlaisnan.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.