From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on ip-172-31-74-118.ec2.internal X-Spam-Level: X-Spam-Status: No, score=-1.9 required=3.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.6 Path: eternal-september.org!reader02.eternal-september.org!feeder1.feed.usenet.farm!feed.usenet.farm!tr2.eu1.usenetexpress.com!feeder.usenetexpress.com!tr3.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!buffer1.nntp.dca1.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 13 Sep 2021 17:24:04 -0500 From: Dennis Lee Bieber Newsgroups: comp.lang.ada Subject: Re: Help: Ada in NetBSD Date: Mon, 13 Sep 2021 18:24:04 -0400 Organization: IISS Elusive Unicorn Message-ID: References: <646f270d-0e65-46a5-b40a-02afab608f1en@googlegroups.com> User-Agent: ForteAgent/8.00.32.1272 X-No-Archive: yes MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-G62nH1U7Kl7RH6a7drzWeTOoRK2fdSg7TzJ67w8QMj6lPWVcOTkbLBJmiL1wOj33spOZOw3x9hp5jOg!kS/5mmniHwJR70HnkMXoYZoA8vjAtgLs/0uZTTlrzStNbYKVA+pun6af1sBF+wkHCxfkXUyg X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 X-Original-Bytes: 2145 Xref: reader02.eternal-september.org comp.lang.ada:62726 List-Id: On Mon, 13 Sep 2021 20:49:01 +0200, Fernando Oleo Blanco declaimed the following: > >In the Makefile.rtl, there are OS/architecture pairs. For example, there >is an entry for FreeBSD-x86 and FreeBSD-x86_64. My basic question is, >why not just have an entry per OS? > In typical usage, x86 is 32-bit only, x86_64 is 64-bit with support for running 32-bit applications. ARM 64-bit should support running 32-bit applications, but may not support the 16-bit "Thumb" instructions which are available in many of the 32-bit models. There is also the question of hardware floating point (which may only be 32-bit). The difference between 32 and 64 bit is significant when compiling code, as it determines if the code does native 64-bit "long integers" or requires software emulation for such data lengths. -- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/