Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!oliveb!apple!bbn!mit-eddie!ll-xn!adelie!mirror!frog!john
From: john@frog.UUCP (John Woods)
Newsgroups: comp.lang.c
Subject: Re: C optimizer
Keywords: C pure function optimization
Message-ID: <1026@frog.UUCP>
Date: 23 Feb 89 04:39:00 GMT
References: <515@larry.UUCP> <9648@smoke.BRL.MIL>
Organization: Misanthropes-R-Us
Lines: 18

In article <9648@smoke.BRL.MIL>, gwyn@smoke.BRL.MIL (Doug Gwyn ) writes:
> Note also that ANSI C implementations can
> 	#define	cos(x)	__intrinsic_cos(x)
> or something along those lines, to allow the compiler to generate
> in-line code rather than an actual function call for standard
> functions.  There actually is floating-point hardware with SQRT
> support; I don't know about COS.

The 68881 chip has FCOS, FSIN, and (gasp) FSINCOS which simultaneously
computes cos() and sin() of the same argument.  A sufficiently clever
compiler could potentially make great use of that.
 
-- 
John Woods, Charles River Data Systems, Framingham MA, (508) 626-1101
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