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Re: WWDC 2013: Apple disclosed their pointer tagging implementation.

From: Ivan Vučica
Subject: Re: WWDC 2013: Apple disclosed their pointer tagging implementation.
Date: Sat, 15 Jun 2013 12:24:04 +0200

Please don't even risk it if not absolutely necessary and key to the project.

This is an implementation detail of Apple runtime that does not need to match GNUstep implementation. It's more important that, e.g., NSXML classes and NSTableViews behave very similar than that implementation details of the runtime and Core Foundation match.


Ivan Vučica
via phone

On 15. 6. 2013., at 12:11, Maxthon Chan <address@hidden> wrote:

I can fair use, can't I? Their NDA is built on top of copyright.

Sent from my iPhone

On 2013年6月15日, at 18:08, Gregory Casamento <address@hidden> wrote:


Just a friendly reminder. :)

Please be very careful about what you disclose here, if you are under NDA.   I don't want a posting here to become any grounds for Apple to cause any issues for GNUstep.


On Sat, Jun 15, 2013 at 5:57 AM, Maxthon Chan <address@hidden> wrote:
I am watching a video session from WWDC 2013 and Apple revealed their way of implementing tagged pointers: use the sole LSB, 1 for tagged pointer and 0 for normal ones. This is applied across all platforms, i386, amd64, armv7 and armv7s (compatible to armv7a in Coretx-A15 and partly compatible with AArch64 in 32-bit mode)

Okay technically I am still under NDA so this is pretty much what I can say.

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Gregory Casamento
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