Michael Gottesman e74367f2b3 [pred-memopt] Only promote destroy_addr if we know that otherwise the allocation is dead. ...

Previously, we just always promoted destroy_addr. With ownership, this does not
work as well since we need to be able to reason about the take operation that we
are performing. In the general case, this would require adding code to
pred-memopts for tracking reads and for compensation store code since we would
need to eliminate the store of the taken value to prevent a double use.

I am going to loop back around later in the year and add back this code once the
time is available. I filed SR-6341. In case any third party contributor is
interested in looking at re-enabling this optimization before I get back to it.

rdar://31521023

2017-11-10 13:01:22 -08:00

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