[PATCH] D74094: Reapply: [IRGen] Emit lifetime intrinsics around temporary aggregate argument allocas

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

In D74094#4646975 <https://reviews.llvm.org/D74094#4646975>, @xbolva00 wrote:

>>> So we can start by giving these objects full-expression lifetime, chase down any program bugs that that uncovers (which will all *unquestionably* be program bugs under the standard), and then gradually work on landing the more aggressive rule (perhaps even for non-trivial types).
>
> maybe provide a new flag to control this behaviour?

You mean for when we start limiting lifetimes to the call rather than the full-expression?  I don't know that we want such a flag in the long term, but having at least a -cc1 flag is usually helpful when we're bringing up new/stricter optimizations, yeah.


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