SLAISNAN(1) | LAPACK auxiliary routine (version 3.2) | SLAISNAN(1) |
NAME¶
SLAISNAN - routine i not for general use
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.
November 2008 | LAPACK auxiliary routine (version 3.2) |