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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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