avoid computing liveness when possible #53168
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In particular, we skip computing liveness for a variable X if all the regions in its type are known to outlive free regions.
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@bors try Local experiments suggest this will be a big perf win, just as before. The diagnostics do degrade, I think, slightly. I think we could probably fix that. |
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⌛ Trying commit 3b7989d with merge aea424935d9666ab3a7efc69c7e88452e460479c... |
nikomatsakis
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☀️ Test successful - status-travis |
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@rust-timer build aea424935d9666ab3a7efc69c7e88452e460479c |
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Success: Queued aea424935d9666ab3a7efc69c7e88452e460479c with parent ccb550f, comparison URL. |
kennytm
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Perf is ready. The numbers look pretty good. |
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I think I will close this in favor of #53177, which builds on it but does more. |
bors
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Aug 10, 2018
…g-values, r=pnkfelix optimize redundant borrows and escaping paths in NLL This builds on #53168 and adds a commit that addresses #53176 -- or at least I think it does. I marked this as WIP because I want to see the test results (and measure the performance). I also want to double check we're not adding in any unsoundness here.
bors
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…g-values, r=pnkfelix optimize redundant borrows and escaping paths in NLL This builds on #53168 and adds a commit that addresses #53176 -- or at least I think it does. I marked this as WIP because I want to see the test results (and measure the performance). I also want to double check we're not adding in any unsoundness here.
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Second stab at #52713. This version avoids computing liveness for variables whose types contain only regions that are known to extend free regions (for any reason, maybe not just because they are returned).
Fixes #52713
r? @pnkfelix
cc @lqd