boomanaiden154 wrote:

> Just sloppy wording, sorry. Virtual bases are always live out of the base 
> subobject destructor.

Ack.

> I know there's been feedback before from Google folks about having a flag 
> whenever we expand an optimization so that they can more easily check whether 
> the expansion specifically caused a particular regression.

I'm the person at Google currently driving this. I think we should be fine with 
a single flag and would probably push back against the introduction of a second 
flag if we agree to postpone the enablement of adding the attribute for classes 
with a non-zero number of bases.

https://github.com/llvm/llvm-project/pull/166276
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