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,e7e6e919cef50811 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-03-14 08:19:05 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news-xfer2.newshosting.com!not-for-mail Newsgroups: comp.lang.ada Subject: Re: comparing gnat/Ada95 and g77 From: Dan Andreatta References: <3C908617.C96A6579@Physik.Uni-Magdeburg.DE> <3C909F9D.6D624B86@flash.net> Message-ID: User-Agent: Xnews/4.11.09 X-Original-NNTP-Posting-Host: 129.252.151.109 Date: 14 Mar 2002 09:19:28 -0700 X-Original-Trace: 14 Mar 2002 09:19:28 -0700, 129.252.151.109 X-COMPLAINTS: Report abuse to abuse@mhogaming.com Organization: Newshosting.com - Highest quality at a great price! www.newshosting.com NNTP-Posting-Date: 14 Mar 2002 16:19:02 GMT NNTP-Posting-Host: 08c1882b.news.newshosting.com X-Trace: DXC=F2hoHZEkHFWg6kAC=?jjb[X`1N4>^k1LSiF6BbIV4YYRLnHEXCOOR@_U8VG44k?;4TM;lF[5C2PfXo5dZhTdOGR]oh3?Aa9Y?3R X-Complaints-To: abuse@newshosting.com Xref: archiver1.google.com comp.lang.ada:21235 Date: 2002-03-14T16:19:02+00:00 List-Id: > something to do with the fact that there are companies with 30+ years > experience tweaking their compiler (the FORTRAN 77 ones are largely > mature, not to say that all intrinsics are optimal, I keep seeing > horrible performance with simple things like circular shift). Absolutely true. I tried the Compaq Visual Fortran on that piece of code (the original one), and the speedup is huge, 68 sec. for g77 (cygwin) versus 4.9 sec for CVF6. Probably CVF does all the possible semplifications that have been suggested in previous posts. Dan