On Monday, March 03, 2008, at 11:53AM, "Duncan McGregor" <[EMAIL PROTECTED]> wrote:
>> I can simply check the calculated size after calling ffi_prep_cif(), and >> compare that to sizeof(void*) to see if the return value will fit in a >> register. > >Is that right? 8 byte structs are returned in EAX and EDX on IA-32, so >I'd expect to call objc_msgSend. The rules are a bit more complex than this (at least on x86). Small structs are returned in registers (upto 8 bytes), but only if the size of the struct is a power of 2. That is, a 6-byte struct will not be returned in registers. I haven't checked recently if the ABI documentation reflects reality, in 10.4 days it didn't. Ronald _______________________________________________ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
