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Path: utzoo!linus!decvax!genrad!mit-eddie!cybvax0!frog!x!john
From: john@x.UUCP (John Woods)
Newsgroups: net.lang.c
Subject: Re: C language hacking
Message-ID: <383@x.UUCP>
Date: Fri, 16-Nov-84 11:12:42 EST
Article-I.D.: x.383
Posted: Fri Nov 16 11:12:42 1984
Date-Received: Tue, 20-Nov-84 07:22:29 EST
References: <5715@brl-tgr.ARPA> <1161@orca.UUCP>
Organization: Charles River Data Systems, Framingham MA
Lines: 23

> 
> 	"It would also be nice if sin( x ) and cos( x ) could be
> 	computed simultaneously with reduced cost.  I doubt if this is
> 	possible but would like to know if it is."
> 
On a more serious note than my last message, how about:

circular( value, sinptr, cosptr) double value, *sinptr, *cosptr;
{
	/* compute both and store, saving function overhead and sharing
	   some commonality of code */
}

It's easy.  Buggering the compiler to do it solves *one* case fast, at the
expense of still having garbage code.  Reminds me of compiler writers who
detect the famous FORTRAN "Whetstone" benchmark and output hand-written
assembly code for the whole thing, so as to achieve artificially high scores..
-- 
John Woods, Charles River Data Systems, Framingham MA, (617) 626-1114
...!decvax!frog!john, ...!mit-eddie!jfw, jfw%mit-ccc@MIT-XX.ARPA

If your puppy goes off in the next room,
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