From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,64599bfe530783cd
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2003-10-19 09:54:04 PST
Path: 
 archiver1.google.com!news2.google.com!news.maxwell.syr.edu!newsfeed2.netcologne.de!news.netcologne.de!newsfeed.stueberl.de!newsr1.ipcore.viaginterkom.de!btnet-peer1!btnet-peer0!btnet-feed5!btnet!news.btopenworld.com!not-for-mail
From: "Martin Dowie" <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Any examples of Byte Ordering Functions
Date: Sun, 19 Oct 2003 16:53:18 +0000 (UTC)
Organization: BT Openworld
Message-ID: <bmufht$ht2$1@sparta.btinternet.com>
References: <CGfjb.41806$Eh3.18271737@news4.srv.hcvlny.cv.net>
 <nbOx2y85U6G0@eisner.encompasserve.org>
 <1066243458.911546@master.nyc.kbcfp.com>
 <muwkb.3583$KA5.30712@newsfep4-glfd.server.ntli.net>
NNTP-Posting-Host: host81-129-50-50.in-addr.btopenworld.com
X-Trace: sparta.btinternet.com 1066582398 18338 81.129.50.50 (19 Oct 2003
 16:53:18 GMT)
X-Complaints-To: news-complaints@lists.btinternet.com
NNTP-Posting-Date: Sun, 19 Oct 2003 16:53:18 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
X-MSMail-Priority: Normal
X-Priority: 3
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
Xref: archiver1.google.com comp.lang.ada:1145
Date: 2003-10-19T16:53:18+00:00
List-Id: <comp.lang.ada>

"chris" <spamoff.danx@ntlworld.com> wrote in message
news:muwkb.3583$KA5.30712@newsfep4-glfd.server.ntli.net...
> architectures into account at compile time!  Can I expect the compiler
> (gnat say) to optimise multiplication of modular types by *powers of
> two* to shift lefts (and divisions by powers of two to shift rights)?

You don't need to look up the RM (Annex B.2) wrt the
predefined modular types in package "Interfaces" and there
you will find Shift_Left/Shift_Right/etc routines. These are
defined as "Intrinsic", which means they are "built in" to the
compiler - i.e. it should have a blinking good idea of a good
representation of this on the target h/w.

If you want "shifts" and "adds", just be explicit to the compiler.

Cheers,
Martin