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Re: 64-bit iOS
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Re: 64-bit iOS


  • Subject: Re: 64-bit iOS
  • From: Paul Franz <email@hidden>
  • Date: Thu, 12 Sep 2013 13:49:58 -0400

Note: this was just added 2 years ago. So it is relatively a recent change. Yes, most java developers in the enterprise are still using Java 6 or earlier.

Sent from my iPad

On Sep 11, 2013, at 2:44 AM, Jean-Daniel Dupas <email@hidden> wrote:

> 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
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>
> -- Jean-Daniel
>
>
>
>

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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>)
 >Re: 64-bit iOS (From: Jean-Daniel Dupas <email@hidden>)

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