From:	"Michael Beck" <beck AT dresearch DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: The "long long int" type: is it fast or slow?
Date:	Sat, 3 Oct 1998 22:59:35 +0200
Organization:	DResearch - Digital Media Systems
Lines:	20
Message-ID:	<6v7k8s$ebk$1@latinum.dresearch.de>
References:	<PGyJdEAR2QF2EwIl AT lwithers DOT demon DOT co DOT uk>
NNTP-Posting-Host:	195.99.74.37
X-Trace:	latinum.dresearch.de 907498588 14708 192.168.0.93 (4 Oct 1998 10:56:28 GMT)
X-Complaints-To:	postmaster AT DResearch DOT DE
NNTP-Posting-Date:	4 Oct 1998 10:56:28 GMT
X-Newsreader:	Microsoft Outlook Express 4.72.3110.5
X-MimeOLE:	Produced By Microsoft MimeOLE V4.72.3110.3
Cache-Post-Path:	news-fa!unknown AT 194 DOT 75 DOT 26 DOT 11
X-Cache:	nntpcache 2.3.2.1 (see http://www.nntpcache.org/)
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Laurence Withers wrote in message ...
>Hi,
>
>Is the GNU C++ "long long int" type (64 bits) fast on the Intel platform
>(using DOS or Windows)? I am mainly interested in bitwise operations (&
>| ! << >> etc) and comparisons (== <= >= !=), rather than arithmetic.
>
>By fast, I mean is it any slower (or even significantly slower) than the
>equivalent operations with 32 bit integers? I couldn't find anything in
>the docs or the FAQ; if I missed something, please point it out.
>
Sure it is slower, because x86 processors didn't support 64 operations. So
in most cases
you need at least 2 CPU operations instead of one to fullfill the operation.

--
Michael Beck   beck AT dresearch DOT de

- Raw text -