NAME
	IEEESPSub -- subtract one single precision IEEE number from another

   SYNOPSIS
	  x   = IEEESPSub(  y  ,  z  );
	 d0		   d0     d1

	float	x,y,z;

   FUNCTION
	Compute x = y - z in IEEE single precision.

   INPUTS
	y -- IEEE single precision floating point value
	z -- IEEE single precision floating point value

   RESULT
	x -- IEEE single precision floating point value

   BUGS

   SEE ALSO
	IEEESPAdd()