Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!aplcen!uakari.primate.wisc.edu!xanth!mcnc!spl
From: spl@mcnc.org (Steve Lamont)
Newsgroups: comp.graphics
Subject: Re: Integral Square Root
Message-ID: <5964@alvin.mcnc.org>
Date: 31 Dec 89 12:46:09 GMT
References: <9170@cbmvax.commodore.com> <21550@mimsy.umd.edu> <9175@cbmvax.commodore.com>
Reply-To: spl@mcnc.org.UUCP (Steve Lamont)
Organization: Foo Bar Brewers Cooperative
Lines: 25

In article <9175@cbmvax.commodore.com> mitchell@cbmvax.commodore.com (Fred Mitchell - PA) writes:
>In article <21550@mimsy.umd.edu> chris@mimsy.umd.edu (Chris Torek) writes:
>>In article <9170@cbmvax.commodore.com> mitchell@cbmvax.commodore.com
>>(Fred Mitchell - PA) writes:
>>>Here's one that is short, fast, and sweet.
>>
>>... and wrong: [...]

... and (apparently) *slower*

Here's the result of a test I ran on a VAX:

  Using Isqrt = 3.277e-05 sec
  Using  sqrt = 1.923e-05 sec

This was including the overhead of converting the argument to a double for
sqrt() and then converting it back to an int for assignment.

							spl (the p stands for
							pretty skeptical)
-- 
Steve Lamont, sciViGuy			EMail:	spl@ncsc.org
NCSC, Box 12732, Research Triangle Park, NC 27709
"Reality involves a square root"
			Thomas Palmer