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

[Gregory Casamento]

With NDAs there is no such thing as "fair use."   What you're told at WWDC is usually considered trade secret information, particularly when they are giving you inside information about how something is implemented.

I am not a lawyer, so I am relying on my experience with such matters to discuss this.   NDAs typically are built on what is considered to be proprietary or trade secret information.   They typically don't cover what is considered to be "common knowledge" that is anything you created yourself without referring to the information covered in the NDA, anything someone else created without improper access to the trade secret information or anything that you can prove was commonly known to the general public.

​That's why I was warning you.  Typically it's dangerous to assume what is and is not covered without consulting someone​

GC

​

On Sat, Jun 15, 2013 at 6:11 AM, 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:

Maxthon,

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.

Gregory

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
Open Logic Corporation, Principal Consultant
yahoo/skype: greg_casamento, aol: gjcasa
(240)274-9630 (Cell)
http://www.gnustep.org
http://heronsperch.blogspot.com

--
Gregory Casamento
Open Logic Corporation, Principal Consultant
yahoo/skype: greg_casamento, aol: gjcasa
(240)274-9630 (Cell)
http://www.gnustep.org
http://heronsperch.blogspot.com