Path: csiph.com!weretis.net!feeder6.news.weretis.net!feeder.usenetexpress.com!feeder-in1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!news.iecc.com!.POSTED.news.iecc.com!nerds-end From: George Neuner Newsgroups: comp.compilers Subject: Re: Optimization techniques and undefined behavior Date: Sat, 04 May 2019 17:59:22 -0400 Organization: A noiseless patient Spider Lines: 12 Sender: news@iecc.com Approved: comp.compilers@iecc.com Message-ID: <19-05-027@comp.compilers> References: <19-04-021@comp.compilers> <19-04-023@comp.compilers> <19-04-037@comp.compilers> <19-04-039@comp.compilers> <19-04-042@comp.compilers> <19-04-044@comp.compilers> <19-04-047@comp.compilers> <19-05-004@comp.compilers> <19-05-006@comp.compilers> <19-05-016@comp.compilers> <19-05-020@comp.compilers> <19-05-024@comp.compilers> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="77447"; mail-complaints-to="abuse@iecc.com" Keywords: errors, arithmetic Posted-Date: 04 May 2019 18:32:35 EDT X-submission-address: compilers@iecc.com X-moderator-address: compilers-request@iecc.com X-FAQ-and-archives: http://compilers.iecc.com Xref: csiph.com comp.compilers:2262 On Fri, 3 May 2019 23:10:53 +0100, Bart wrote: >I just haven't found overflow on numbers the huge problem that people >say it is. It was much more of a problem on 16-bit machines. The vast majority of *typical* integer uses in programs will not overflow 32 bits. But even with 64 bits, there still are situations - i.e. untrusted user input - where prudence demands that you test. George