rjmccall accepted this revision. rjmccall added a comment. This revision is now accepted and ready to land.
LGTM, thanks. ================ Comment at: lib/CodeGen/CGNonTrivialStruct.cpp:764 + Object = CGF->EmitObjCConsumeObject(QT, Object); + CGF->EmitARCStoreWeak(Addrs[DstIdx], Object, true); + } ---------------- ahatanak wrote: > rjmccall wrote: > > I guess this is the most reasonable thing to do, given that we don't have > > an entrypoint for it. Please ask the ObjC runtime team to consider giving > > us one, though. We could pretty easily peephole assignments into `__weak` > > variables where the source is loaded from a `__weak` l-value / x-value, and > > Swift would probably be able to take advantage of it, too. > > > > You might want to go ahead and add `emitARCCopyAssignWeak` / > > `emitARCMoveAssignWeak` methods on CGF that do these operations and which > > can be optimized to use those entrypoints if/when they're added. > Do you mean we should ask for the following objc runtime functions and use > them in visitARCWeak? > > ``` > // dst and src are either null or registered as __weak objects. > void objc_copyAssignWeak(id *dst, id *src) > void objc_moveAssignWeak(id *dst, id *src) > ```` I meant that we should implement `emitARCCopyAssignWeak` and `emitARCMoveAssignWeak` by calling those functions if they're available, yes. (Obviously that would be a follow-up patch, even assuming the ObjC runtime agrees to add them.) Those functions would be specified as leaving the source in a zeroed state, which is as good as uninitialized, so they could be used for true-destructive moves as well. https://reviews.llvm.org/D44095 _______________________________________________ cfe-commits mailing list firstname.lastname@example.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits