Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:81721
Return-Path: <leight@gmail.com>
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Delivered-To: mailing list internals@lists.php.net
Received: (qmail 22746 invoked from network); 3 Feb 2015 15:12:26 -0000
Received: from unknown (HELO lists.php.net) (127.0.0.1)
  by localhost with SMTP; 3 Feb 2015 15:12:26 -0000
Authentication-Results: pb1.pair.com smtp.mail=leight@gmail.com; spf=pass; sender-id=pass
Authentication-Results: pb1.pair.com header.from=leight@gmail.com; sender-id=pass
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 74.125.82.43 as permitted sender)
X-PHP-List-Original-Sender: leight@gmail.com
X-Host-Fingerprint: 74.125.82.43 mail-wg0-f43.google.com  
Received: from [74.125.82.43] ([74.125.82.43:43175] helo=mail-wg0-f43.google.com)
	by pb1.pair.com (ecelerity 2.1.1.9-wez r(12769M)) with ESMTP
	id 0A/61-20608-955E0D45 for <internals@lists.php.net>; Tue, 03 Feb 2015 10:12:25 -0500
Received: by mail-wg0-f43.google.com with SMTP id y19so45169468wgg.2
        for <internals@lists.php.net>; Tue, 03 Feb 2015 07:12:22 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :cc:content-type;
        bh=z9WewPBUWOkKXWWKNjVL74TOJ8uCub45DNcpM1YHBrg=;
        b=v3KNPJH0f4OzegZiOrj5qisNqtJrFKDuzrW4BufmCtWfWS9/e4lgd1V9gOEzl0o+Al
         HsQDsHlXDLvRnoTs09iysD0YOpN+RKiPTSa4mbGuPqzfcfCUuJ+6yMGp2nOrHLj2v7B4
         JxBNYE39aSnHEPMPK8cpYx+HJpNg/8jGsCiZzrshQUNn/HQjFUeRc7Ep/TY/ExTmynaD
         Gh602JWkFqaPEeWgftct7NcBCWL6mPY/Fb6C8EztPbuMSMSPqPNybeIvJTC69IjyK/E/
         G4sA6tDHV29h4iR1+51PsYsgfMNGBpBDwJRjaXizsd9U7dHuPAZU1GQ6360fjZdV/qgK
         A+RQ==
MIME-Version: 1.0
X-Received: by 10.194.236.200 with SMTP id uw8mr56280134wjc.10.1422976342553;
 Tue, 03 Feb 2015 07:12:22 -0800 (PST)
Received: by 10.216.50.139 with HTTP; Tue, 3 Feb 2015 07:12:22 -0800 (PST)
In-Reply-To: <1470D29A-2D95-4E03-BEBC-CE1D9AD2FB16@ajf.me>
References: <CAPwsocEjjJPkUvihYdj8tNRrf3XQ9WJzT=1Er6gjLs2MMgHwsw@mail.gmail.com>
	<1D8DC03D-0E2C-494C-9ED2-244334F57D8A@ajf.me>
	<CAPwsocHACBzYg8L5O3s2r=BGDrhe4VaLNTFmCX=rz_4_rpRFZw@mail.gmail.com>
	<6E8210CD-4BA3-4694-8482-4803F562D77C@ajf.me>
	<CAPwsocFgHY3B-0dt6QWSmLJOgEvcBwtE1rSHXWrRh44jAv_u0w@mail.gmail.com>
	<1BEEF374-D8BC-4FE2-8CE0-5EBB1AC4CF04@ajf.me>
	<CAPwsocFQgZy9WDGjG6PQ+mUvwYkzS69n0s-Uw5yCYveGK1OYZQ@mail.gmail.com>
	<3B265E0A-7479-456A-B134-5CA607C68EFF@ajf.me>
	<CAPwsocFiDA3jj=Q3Vzd9a==48+G6ygTt_4QJU6jqi+iCQmyV8g@mail.gmail.com>
	<1470D29A-2D95-4E03-BEBC-CE1D9AD2FB16@ajf.me>
Date: Tue, 3 Feb 2015 15:12:22 +0000
Message-ID: <CAPwsocH-StE-HS74m0XyPpqq7TMhY26iXiEFmLmxheAQ2+T+mQ@mail.gmail.com>
To: Andrea Faulds <ajf@ajf.me>
Cc: internals@lists.php.net
Content-Type: text/plain; charset=UTF-8
Subject: Re: [PHP-DEV] Zero-fill right shift.
From: leight@gmail.com (Leigh)

On 3 February 2015 at 15:02, Andrea Faulds <ajf@ajf.me> wrote:
> Why would it be promoted?! The high bit is the 63rd bit. It fits within a long.
>

I'm assuming your bigint implementation would want to respect signage.

When does it promote? 63rd to preserve signage?

4611686018427387904 // 1 << 62 - int
9223372036854775808 // 1 << 63 - bigint
18446744073709551616 // 1 << 64 - bigint

Or 64th to for complete madness?

4611686018427387904 // 1 << 62 - int
-9223372036854775808 // 1 << 63 - int
18446744073709551616 // 1 << 64 - bigint