add a per-param-env cache to impls_bound
#37152
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arielb1
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@arielb1 r=me once you finish confirming there do not seem to be adverse performance consequences. |
There used to be only a global cache, which led to uncached calls to trait selection when there were type parameters. I'm running a check that there are no adverse performance effects. Fixes rust-lang#37106 (drop elaboration times are now ~half of borrow checking, so might still be worthy of optimization, but not critical).
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@bors r=pnkfelix |
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📌 Commit a61d85b has been approved by |
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I tried this out on Serde and compile time dropped from 10 seconds using 1.14.0-nightly (a3bc191 2016-10-10) to 5.3 seconds using this commit. Thanks for taking care of this so quickly! |
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add a per-param-env cache to `impls_bound` There used to be only a global cache, which led to uncached calls to trait selection when there were type parameters. This causes a 20% decrease in borrow-checking time and an overall 0.5% performance increase during bootstrapping (as borrow-checking tends to be a tiny part of compilation time). Fixes #37106 (drop elaboration times are now ~half of borrow checking, so might still be worthy of optimization, but not critical). r? @pnkfelix
alexcrichton
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Seems harmless enough. I guess that this is marked for beta-backport because the elaboration code is relatively new? cc @rust-lang/compiler -- should we backport? compile-time only. |
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SGTM as this seems to noticeably push back on a compile times regression. |
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Marking as beta-accepted. |
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There used to be only a global cache, which led to uncached calls to
trait selection when there were type parameters.
This causes a 20% decrease in borrow-checking time and an overall 0.5% performance increase during bootstrapping (as borrow-checking tends to be a tiny part of compilation time).
Fixes #37106 (drop elaboration times are now ~half of borrow checking,
so might still be worthy of optimization, but not critical).
r? @pnkfelix