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Ran 29 Nov 2021 12:19PM UTC

Files 364

Run time 40s

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Committed 29 Nov 2021 02:21AM UTC coverage: 89.529% (+0.02%) from 89.507%

Job # #37074.1

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push

local

Committed by

web-flow

Commit Message

optimizer: SROA `mutable(immutable(...))` case correctly (#43239)

Our SROA should be able to handle `mutable(immutable(...))` case even
without "proper" alias analysis, since we eliminate `immutable` first
and then process `mutable` within our iterative approach.

It turns out it didn't work because after the immutable handling
we keep the reference count _before_ DCE, but didn't update dead 
reference count. This commit fixes it and now we should be able to 
eliminate more allocations, e.g.:
```julia
julia> simple_sroa(s) = broadcast(identity, Ref(s))
simple_sroa (generic function with 1 method)

julia> simple_sroa("compile"); @allocated(simple_sroa("julia"))
0
```

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master: 78%

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