• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: 64-bit iOS
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: 64-bit iOS


  • Subject: Re: 64-bit iOS
  • From: Jean-Daniel Dupas <email@hidden>
  • Date: Wed, 11 Sep 2013 08:44:34 +0200

This is the contrary. In Obj-c all pointers are effectively double size, but in Java, they are not.

See “Compressed oops" at http://docs.oracle.com/javase/7/docs/technotes/guides/vm/performance-enhancements-7.html

Le 11 sept. 2013 à 00:18, Paul Franz <email@hidden> a écrit :

> Should be interesting to see how this plays out. When it comes to Java, when you switch from a 32-bit JVM to a 64-bit JVM there is a 10% penalty doing so. The main reason has to do with pointers. All pointers double in size. The effect might be less in a Objective-C program.
>
> Paul Franz
>
> On Sep 10, 2013, at 5:47 PM, Tom Davie <email@hidden> wrote:
>
>>
>> On 10 Sep 2013, at 23:30, Jean-Daniel Dupas <email@hidden> wrote:
>>
>>>
>>> For ARM, 64 bit matters because the instruction set has been updated to provider better performances.
>>>
>>> I just hope the performance boost provided by this architecture change will be enough to balance the slow-down due to the increase of instruction and pointer size.
>>
>> Note, this was actually more significant on x86, where most of the mess caused by CISC (like having bugger all registers) got sorted out.
>>
>> Tom Davie
>> _______________________________________________
>>
>> Cocoa-dev mailing list (email@hidden)
>>
>> Please do not post admin requests or moderator comments to the list.
>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>>
>> Help/Unsubscribe/Update your Subscription:
>>
>> This email sent to email@hidden
>

-- Jean-Daniel





_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden


  • Follow-Ups:
    • Re: 64-bit iOS
      • From: Paul Franz <email@hidden>
References: 
 >64-bit iOS (From: Scott Ribe <email@hidden>)
 >Re: 64-bit iOS (From: Abdul Sowayan <email@hidden>)
 >Re: 64-bit iOS (From: Jean-Daniel Dupas <email@hidden>)
 >Re: 64-bit iOS (From: Tom Davie <email@hidden>)
 >Re: 64-bit iOS (From: Paul Franz <email@hidden>)

  • Prev by Date: NSWindowCloseButton and friends mouse over highlight
  • Next by Date: Re: ARC vs Manual Reference Counting
  • Previous by thread: Re: 64-bit iOS
  • Next by thread: Re: 64-bit iOS
  • Index(es):
    • Date
    • Thread