From: bors <bors@rust-lang.org>
Date: Thu, 4 Aug 2016 10:01:37 +0000 (-0700)
Subject: Auto merge of #35168 - scottcarr:deaggregation, r=nikomatsakis
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=e804a3cf256106c097d44f6e0212cd183122da07;p=rust.git

Auto merge of #35168 - scottcarr:deaggregation, r=nikomatsakis

[MIR] Deaggregate structs to enable further optimizations

Currently, we generate MIR like:

```
tmp0 = ...;
tmp1 = ...;
tmp3 = Foo { a: ..., b: ... };
```

This PR implements "deaggregation," i.e.:

```
tmp3.0 = ...
tmp3.1 = ...
```

Currently, the code only deaggregates structs, not enums.  My understanding is that we do not have MIR to set the discriminant of an enum.
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e804a3cf256106c097d44f6e0212cd183122da07