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| author | bors <bors@rust-lang.org> | 2018-06-22 08:34:26 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2018-06-22 08:34:26 +0000 |
| commit | e70ff68aafbb923946856fea201e0251869f0dd5 (patch) | |
| tree | 70ff13c39f5cfe453f09774e6b0f9f22426d4a4d /src/libsyntax | |
| parent | 7dae5c0e06f10042fc3b29a55bf6285e539c06db (diff) | |
| parent | 63a4e721b30964022cbe7abb98dabc74f3a7a676 (diff) | |
| download | rust-e70ff68aafbb923946856fea201e0251869f0dd5.tar.gz rust-e70ff68aafbb923946856fea201e0251869f0dd5.zip | |
Auto merge of #51660 - lqd:the-MIRnistry-of-walks, r=nikomatsakis
NLL: Walk the MIR only once for the "unused mut" lint Turns the quadratic loop gathering local variable assignments into a single MIR walk, and brings down the number of `super_mir` calls generated from `do_mir_borrowck` to the expected levels seen in `nll::replace_regions_in_mir` and `nll::compute_regions`, i.e. on clap: 1883 `super_mir` calls instead of 8011. The limited perf numbers I could gather on my machines look to be what we expected: `clap-check` seems to be gaining back a lot of the 7% we previously saw in `visit_mir`. Fixes #51641. r? @nikomatsakis
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