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Rollup merge of #51399 - ngg:nll-performance, r=nikomatsakis

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NLL performance boost

This makes compilation of the [inflate](https://github.com/rust-lang-nursery/rustc-perf/tree/master/collector/benchmarks/inflate) benchmark compile 2 times faster on my computer when NLL is enabled.
This does not fix the #51377 perfectly, it's still 4-5 times slower than without NLL, but it's a start.
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kennytm 2018-06-08 07:05:44 +08:00 committed by GitHub
commit 326331c34f
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1 changed files with 9 additions and 7 deletions
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src/librustc_mir/borrow_check/nll/type_check/liveness.rs
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@ -104,6 +104,7 @@ impl<'gen, 'typeck, 'flow, 'gcx, 'tcx> TypeLivenessGenerator<'gen, 'typeck, 'flo
location, live_local
);
if log_enabled!(::log::Level::Debug) {
self.flow_inits.each_state_bit(|mpi_init| {
debug!(
"add_liveness_constraints: location={:?} initialized={:?}",
@ -111,6 +112,7 @@ impl<'gen, 'typeck, 'flow, 'gcx, 'tcx> TypeLivenessGenerator<'gen, 'typeck, 'flo
&self.flow_inits.operator().move_data().move_paths[mpi_init]
);
});
}
let mpi = self.move_data.rev_lookup.find_local(live_local);
if let Some(initialized_child) = self.flow_inits.has_any_child_of(mpi) {