NAME
	IEEEDPFloor -- compute Floor function of IEEE double precision number

   SYNOPSIS
	  x   = IEEEDPFloor(  y  );
	d0/d1		    d0/d1

	double	x,y;

   FUNCTION
	Calculate the largest integer less than or equal to x and return it.
	This value may have more than 32 bits of significance.

   INPUTS
	y -- IEEE double precision floating point value

   RESULT
	x -- IEEE double precision floating point value

   BUGS

   SEE ALSO
	IEEEDPCeil()