laisnan: test for NaN, unoptimized

Collaboration diagram for laisnan: test for NaN, unoptimized:

Functions
logical function	dlaisnan (din1, din2)
	DLAISNAN tests input for NaN by comparing two arguments for inequality.
logical function	slaisnan (sin1, sin2)
	SLAISNAN tests input for NaN by comparing two arguments for inequality.

Detailed Description