IEEECK(3)
is called from the ILAENV to verify that Infinity and possibly NaN arithmetic is safe (i.e
SYNOPSIS
 INTEGER FUNCTION

IEEECK( ISPEC, ZERO, ONE )

INTEGER
ISPEC

REAL
ONE, ZERO
PURPOSE
IEEECK is called from the ILAENV to verify that Infinity and
possibly NaN arithmetic is safe (i.e. will not trap).
ARGUMENTS
 ISPEC (input) INTEGER

Specifies whether to test just for inifinity arithmetic
or whether to test for infinity and NaN arithmetic.
= 0: Verify infinity arithmetic only.
= 1: Verify infinity and NaN arithmetic.
 ZERO (input) REAL

Must contain the value 0.0
This is passed to prevent the compiler from optimizing
away this code.
 ONE (input) REAL

Must contain the value 1.0
This is passed to prevent the compiler from optimizing
away this code.
RETURN VALUE: INTEGER
= 0: Arithmetic failed to produce the correct answers
= 1: Arithmetic produced the correct answers
Return if we were only asked to check infinity arithmetic