From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-return-45119-ml=inbox.vuxu.org@zsh.org>
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org
X-Spam-Level: 
X-Spam-Status: No, score=-1.0 required=5.0 tests=DKIM_ADSP_CUSTOM_MED,
	FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham
	autolearn_force=no version=3.4.2
Received: from primenet.com.au (ns1.primenet.com.au [203.24.36.2])
	by inbox.vuxu.org (OpenSMTPD) with ESMTP id 8d9251aa
	for <ml@inbox.vuxu.org>;
	Sat, 21 Dec 2019 21:06:36 +0000 (UTC)
Received: (qmail 2565 invoked by alias); 21 Dec 2019 17:56:55 -0000
Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Workers List <zsh-workers.zsh.org>
List-Post: <mailto:zsh-workers@zsh.org>
List-Help: <mailto:zsh-workers-help@zsh.org>
List-Unsubscribe: <mailto:zsh-workers-unsubscribe@zsh.org>
X-Seq: 45119
Received: (qmail 17559 invoked by uid 1010); 21 Dec 2019 17:56:55 -0000
X-Qmail-Scanner-Diagnostics: from mail-wm1-f50.google.com by f.primenet.com.au (envelope-from <stephane.chazelas@gmail.com>, uid 7791) with qmail-scanner-2.11 
 (clamdscan: 0.102.1/25663. spamassassin: 3.4.2.  
 Clear:RC:0(209.85.128.50):SA:0(-2.0/5.0):. 
 Processed in 1.181472 secs); 21 Dec 2019 17:56:55 -0000
X-Envelope-From: stephane.chazelas@gmail.com
X-Qmail-Scanner-Mime-Attachments: |
X-Qmail-Scanner-Zip-Files: |
Received-SPF: pass (ns1.primenet.com.au: SPF record at _netblocks.google.com designates 209.85.128.50 as permitted sender)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:date:from:to:cc:subject:message-id
         :mail-followup-to:references:mime-version:content-disposition
         :in-reply-to:user-agent;
        bh=Puz8myDsz5MCXP0VFbJAEwR/xAG1VjLLOdUAc/dLIJg=;
        b=onBXEWC7LmEyPTgE7QjEQ1CRkhSXGZBYy+wtPQQPBuhdT4XzdFDVJVEQ0Hrc3G7rz+
         eu9EceZp4g7CTjwDcF8/ja3kbP/NkHvZ9v8WUTXUvy7JK277inn+iqDwCef0Nr/eM4m9
         UNgWyR4Dif3WfK8CMnbaXFpVdX6RE7CUFckV9O18ifK/Bc7/9KrsWb02HAprYs8TkEaH
         FW23sfDd1FFSLlXXiC1W3rySCH82j2flMugcL+xVNzXQTkarU3xxJG4MeAbzlx4ZTOWa
         uu7kAVY5iykmh4vAuUshudOQekY3AItXlmfJ1q6Zho57SIAMMiwyXPX6EndtxV1TZEEL
         3AXg==
X-Gm-Message-State: APjAAAXsoS6QQ7NgB/cZaVgs3rq+8FMU2e7ZFjUc7ez+6rfEqNza/PmW
	eZzWW0H6gj9OC6HdL19lGa4=
X-Google-Smtp-Source: APXvYqwbH/Cv2Ot+5hzmcLAOfEnva+JzoL9YsHM1D+yu6f9FY/jgCIAzrna2QCF1/kFLYugzUjIpog==
X-Received: by 2002:a7b:c775:: with SMTP id x21mr16185617wmk.59.1576950980496;
        Sat, 21 Dec 2019 09:56:20 -0800 (PST)
Date: Sat, 21 Dec 2019 17:56:18 +0000
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Roman Perepelitsa <roman.perepelitsa@gmail.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: zsh converts a floating-point number to string with too much
 precision
Message-ID: <20191221175618.oolvw72n26tir2wg@chaz.gmail.com>
Mail-Followup-To: Roman Perepelitsa <roman.perepelitsa@gmail.com>,
	Zsh hackers list <zsh-workers@zsh.org>
References: <20191220013711.GA708801@zira.vinc17.org>
 <20191220165824.ufvjtx37xt7dp2dt@chaz.gmail.com>
 <CAN=4vMqh7UH00wH6YE2DtnwqUcoH4+uoChEKr1W4hsZiq1A36A@mail.gmail.com>
 <20191221005005.GB767822@zira.vinc17.org>
 <20191221084736.bokldw7tzxw3thn3@chaz.gmail.com>
 <CAN=4vMrgHmo6QRejar1kWMJgFH60m3LvCn4-SkK7Mk1GrSE_YA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAN=4vMrgHmo6QRejar1kWMJgFH60m3LvCn4-SkK7Mk1GrSE_YA@mail.gmail.com>
User-Agent: NeoMutt/20180716

2019-12-21 10:43:43 +0100, Roman Perepelitsa:
[...]
> There is no simple algorithm that achieves this. I recall reading long
> papers a few years back that were describing various inventions in
> this field. They were pretty scary.

https://github.com/openjdk/jdk/blob/f4af0eadb6eaf9d9614431110ab7fc9c1588966d/src/java.base/share/classes/jdk/internal/math/FloatingDecimal.java#L424
is not exactly trivial. I enjoyed reading the comments even if I
have not clue what the the code is doing.

-- 
Stephane