math function speed

[gwyn at brl-smoke.UUCP]

In article <2050 at ulysses.homer.nj.att.com> ggs at ulysses.homer.nj.att.com (Griff Smith) writes:
>What's your definition of twice as accurate?

In a test where the result of "sqrt" was compared to known correct
answers, for the following arguments:

	0	1/5	1/3	1/2	1	2	e
	3	pi	4	5	9	10	16
	49	100	10000

I got the following results:

SVR2
function "sqrt":

    max abs error:	  2.7755576e-17
    max rel error:	  2.4037034e-17

4.3BSD
function "sqrt":

    max abs error:	  5.5511151e-17
    max rel error:	  3.3669215e-17