On Jul 9, 2012, at 5:44 AM, Vincent Habchi <vi...@macports.org> wrote: > Modern CPU do not enforce strict alignment for integer access. You can > perfectly access a Dword (64 bits) at any address, even or odd. It is just > more efficient to align 64-bits words at 8-bytes boundary, 32-bits at > 4-bytes, etc. This contrasts with the old times: for example, on a 68000 > processor, trying to access a 16-bit word at an odd address (e.g. move.w d0, > (a0)+ with a0 odd) would result in a exception n°3 (address error).
Some CPUs still enforce aligned integer access, such as the ARM CPUs in some iOS devices. If your iOS crash log says EXC_ARM_DA_ALIGN then you died from a misalignment fault. -- Greg Parker gpar...@apple.com Runtime Wrangler _______________________________________________ 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
