Path: csiph.com!x330-a1.tempe.blueboxinc.net!feeder1.hal-mli.net!border3.nntp.dca.giganews.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Tue, 26 Apr 2011 13:09:28 -0500 Date: Tue, 26 Apr 2011 11:09:22 -0700 From: Patricia Shanahan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 MIME-Version: 1.0 Newsgroups: comp.lang.java.programmer Subject: Re: Java left shift and right shift operators. References: <295e16b3-2ed8-4529-bfb0-1cc26ed93ad6@d26g2000prn.googlegroups.com> <188cz6ta97kkm$.dlg@kimmeringer.de> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Message-ID: Lines: 13 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 75.8.126.96 X-Trace: sv3-NkePmi0SSQhdZvstcdOoqMzejKKkO/iV1G9LivHdi8uYnCy1GP2vsmPTR25BO1f9dzJEc5PSmfu3EyZ!uumRAU+U93NYscoCytkWUjWPhI3/4ZaCxl8zc9JFrbdtfc6jZR5DyuGpNqAi+BA7i1OuShTJ3kfY!qZBoz95B2SJzkEDo8pJ5QAggxb/gFyl/M7mY7L3XeqI= 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: 1910 Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:3276 On 4/26/2011 9:32 AM, Sanny wrote: ... > I have computed and found "if statments" take 20-50 times longer than > basic arithmetic operations. So I wanted to replace if condition by > some arithmetics/ Maths. ... You are seriously underestimating the range of variation of if-statement time. It can be just as fast as an arithmetic statement. It must be measured in context - you could be wasting your time if the actual mix of left and right shifts has a pattern the branch predictor can pick up. Patricia