Re: Algorithm Optimization

Richard Harnden <richard.nospam@gmail.com>
Wed, 16 Sep 2020 22:45:04 +0100

          From comp.compilers
Related articles
[3 earlier articles]
Re: Algorithm Optimization derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2020-09-15)
Re: Algorithm Optimization gah4@u.washington.edu (gah4) (2020-09-15)
Re: Algorithm Optimization mwmarkland@gmail.com (mwmarkland@gmail.com) (2020-09-16)
Re: Algorithm Optimization rick.c.hodgin@gmail.com (Rick C. Hodgin) (2020-09-16)
Re: Algorithm Optimization derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2020-09-16)
Re: Algorithm Optimization gah4@u.washington.edu (gah4) (2020-09-16)
Re: Algorithm Optimization richard.nospam@gmail.com (Richard Harnden) (2020-09-16)
Re: Algorithm Optimization DrDiettrich1@netscape.net (Hans-Peter Diettrich) (2020-09-17)
Re: Algorithm Optimization tkoenig@netcologne.de (Thomas Koenig) (2020-09-17)
Re: Algorithm Optimization minforth@arcor.de (A. K.) (2020-09-21)
Re: Algorithm Optimization DrDiettrich1@netscape.net (Hans-Peter Diettrich) (2020-12-13)
Re: Algorithm Optimization gah4@u.washington.edu (gah4) (2020-12-20)
Re: Algorithm Optimization johann@myrkraverk.com (Johann 'Myrkraverk' Oskarsson) (2021-04-21)
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From: Richard Harnden <richard.nospam@gmail.com>
Newsgroups: comp.compilers
Date: Wed, 16 Sep 2020 22:45:04 +0100
Organization: A noiseless patient Spider
References: 20-09-032 20-09-035 20-09-036
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="36082"; mail-complaints-to="abuse@iecc.com"
Keywords: errors
Posted-Date: 16 Sep 2020 21:20:14 EDT
In-Reply-To: 20-09-036

On 16/09/2020 06:25, JL wrote


> [Back when people cared about Whetstone and Dyrystone benchmarks,
> compilers recognized code sequences from those benchmarks for, uh,
> special processing. But it doesn't generalize very well. -John]


And can backfire badly for the company involved ...


many VW cars being sold in America had a "defeat device" - or software -
in diesel engines that could detect when they were being tested,
changing the performance accordingly to improve results.

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