From:	kurt DOT skauen AT funcom DOT com (Kurt Skauen)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: some advice required
Date:	Thu, 27 Feb 1997 16:43:41 GMT
Organization:	Funcom production A/S
Lines:	33
Message-ID:	<857061715.836060@araga.funcom.com>
References:	<c=GB%a=_%p=Indigo_Active_Vi%l=CRIANLARICH-970227150111Z-238 AT crianlarich DOT Indigo>
Reply-To:	kurt DOT skauen AT funcom DOT com
NNTP-Posting-Host:	araga.funcom.com
Cache-Post-Path:	araga.funcom.com!unknown AT pcshare44 DOT funcom DOT com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Robert Humphris <r DOT humphris AT indigo-avs DOT com> wrote:

>I think that they are both the same! The speed ups with maths occur at
>multiplicaton/division time
>when you do the old bit shifts (<< & >>) instead.
>
>If this is wrong, will some one please tell me, as I don't want to be
>labouring upder misinformation
>
>Rob Humphris

This is normaly not true when programming in C, or C++ since most
compiler will optimize all division/multiplication with constants that
is a power of two to shift's anyway so 

foo = bar / k;

where bar is variable integer, and k is a constant which is a power of
two will be converted into:

foo = bar >> log(k) / log(2);

So using shiftings for the sake of optimaization is normaly wasted,
and often leads to less self-explaining code.


=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=

How to kill a daemon:  for(;0;)

Kurt. 	Programmer Funcom/R&D
The above expressions is not ment to represent Funcom.

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