[swift-dev] [semantic-arc][proposal] High Level ARC Memory Operations

Chris Lattner clattner at apple.com
Mon Oct 10 22:05:12 CDT 2016

> On Oct 7, 2016, at 2:38 PM, Michael Gottesman via swift-dev <swift-dev at swift.org> wrote:
> Attached below is an updated version of the proposal. Again a rendered version is located at:
> https://gottesmm.github.io/proposals/high-level-arc-memory-operations.html <https://gottesmm.github.io/proposals/high-level-arc-memory-operations.html>
> Michael

This looks great Michael, a couple of comments/questions:

typo: affects -> effects.

>If ARC Code Motion wishes to move the ARC semantics of ownership qualified load, store instructions, it must now consider read/write effects. On the other hand, it will be able to now not consider the side-effects of destructors when moving retain/release operations.

Can you elaborate on what you mean by this?  Does this mean the ARC optimizer has additional freedom somehow to ignore side effects in deinits?  What grants that ability?

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