On Jul 2, 2012, at 4:17 PM, Kyle Sluder wrote: >> It depends. 64-bit values are twice as big as 32-bit ones, so they use up >> twice as much L2 cache and RAM. > > I would be surprised if cache is managed at anything other than multiples of > register width (64 bits).
That's not the point. Data containing 64-bit values (in objects, structs, stack frames…) is obviously bigger than data containing smaller values. There's a fairly large increase in memory usage when a process switches to 64-bit, for this reason, and it carries with it a performance hit. You can't do much about the sizes of pointers without a lot of work, but you can use smaller fields for integers where it makes sense. —Jens _______________________________________________ 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/archive%40mail-archive.com This email sent to arch...@mail-archive.com
