The best thing is to code it up and try it. On Mar 28, 2014, at 06:47 , Dave <d...@looktowindward.com> wrote:
> > On 28 Mar 2014, at 01:02, Jens Alfke <j...@mooseyard.com> wrote: > >> >> On Mar 27, 2014, at 3:34 PM, Roland King <r...@rols.org> wrote: >> >>> no difference, NSInteger, NSUInteger are just typedefs for underlying >>> integral types >> >> On 32-bit iOS, int and NSInteger are both 32-bit, so there’s no difference. >> On Mac OS (and 64-bit iOS), int is 32-bit but NSInteger is 64-bit. I don’t >> actually know whether there’s any performance difference between 32- and >> 64-bit math on 64-bit processors, but you can’t just hand-wave the question >> away. >> > > I know, that’s why I asked which is fastest. > >> What _is_ different is that 64-bit numbers occupy twice as much space in the >> CPU caches, so only half as many will fit. Cache misses are orders of >> magnitude more expensive than integer math operations, so that’s the more >> significant issue. > > The values will be held inside the object properties as int or whatever. I > was wondering if I should write getters to return it as an UIInteger, e.g. > hold the real int value in an iVar and have the associated property getter > coerce it to NSInteger on return. > > That way, it will only hold the values as 64 bit when they are being worked > on. > > Not sure which is more effecient in terms of speed or if it matters that much. > > Cheers > Dave > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > 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: > https://lists.apple.com/mailman/options/cocoa-dev/rmann%40latencyzero.com > > This email sent to rm...@latencyzero.com -- Rick
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