Xref:	news2.mv.net comp.os.msdos.djgpp:4898
From:	richard DOT young AT crc DOT doc DOT ca (Richard Young)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Speed optimization: memcpy() or for loop ??
Date:	12 Jun 1996 14:56:57 GMT
Organization:	Communications Research Centre
Lines:	23
Message-ID:	<4pmlrp$p7u@crc-news.doc.ca>
NNTP-Posting-Host:	yaker.vpcs.doc.ca
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

A question for the optimization experts:

For moving data, is it faster to use

a) memcpy(x,y,n*sizeof(x[0])) 

or 

b) for (i = 0; i < n; i++) x[i] = y[i];

or are they basically the same speed.

With C++ is it better code practice to use b) over a)?

Thanks for all answers and opinions.

-----------------------------------------

Richard Young
Communications Research Centre,
Ottawa, Canada
richard DOT young AT crc DOT doc DOT ca

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