NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part2/14326

Internet Message Format | 1996-08-05 | 1.3 KB

Path: mail2news.demon.co.uk!genesis.demon.co.uk
From: Lawrence Kirby <[e-mail]>
Newsgroups: comp.lang.c
Subject: Re: Square of a floating point number.
Date: Sat, 13 Apr 96 14:25:57 GMT
Organization: none
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: genesis.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.27
X-Mail2News-Path: genesis.demon.co.uk

In article <[e-mail]> [e-mail] "Ryszard Pater" writes:

>How could I optimize for a speed the function to compute the square
>of a floating point number?  I defined a function as follows:
>inline float sqr(float a) {return a*a;}
>or macro version
>#define sqr(a) ((a)*(a)).
>If You have a better solution give me a feed back, please.

You're not likely to do better than that for a single square operation.
But there again a single square operation isn't going to be speed critical.
Presumably you have an algorithm which performs lots of operation and because
of that is speed critical. To optimise for speed you should consider how
how the algorithm as a whole can be optimised.

--
-----------------------------------------
Lawrence Kirby | [e-mail]
Wilts, England | [e-mail]
-----------------------------------------