SYNOPSIS
- LOGICAL FUNCTION
- SLAISNAN(SIN1,SIN2)
- REAL SIN1,SIN2
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.
ARGUMENTS
- SIN1 (input) REAL
-
SIN2 (input) REAL
Two numbers to compare for inequality.