Re: 64-bit iOS
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
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-- Jean-Daniel
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